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  • The LD3985 provides up to 150 mA, from 2.5 V to 6 V input voltage. The ultra low drop voltage, low quiescent current and low noise make it suitable for low power applications and in battery-powered systems. Regulator ground current increases slightly in dropout only, prolonging the battery life. Power supply rejection is better than 60 dB at low frequencies and rolls off at 10 kHz. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits. Shutdown logic control function is available, this means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The LD3985 is designed to work with low ESR ceramic capacitors. Typical applications are in mobile phones and similar battery-powered wireless systems.

    Key Features

    • Input voltage from 2.5 to 6 V
    • Stable with low ESR ceramic capacitors
    • Ultra low-dropout voltage (60 mV typ. at 150 mA load, 0.4 mV typ. at1 mA load)
    • Very low quiescent current (85 μA typ. at no load, 170 μA typ. at 150 mA load; max.1.5 μA in OFF mode)
    • Guaranteed output current up to 150 mA
    • Wide range of output voltages: 1.22 V; 1.8 V; 2.5 V; 2.7 V; 2.8 V;2.9 V; 3.3 V; 4.7 V
    • Fast turn-on time: typ. 200 μs [CO = 1 μF, CBYP = 10 nF and IO = 1 mA]
    • Logic-controlled electronic shutdown
    • Internal current and thermal limit
    • Output low noise voltage 30 μVRMS over 10 Hz to 100 kHz
    • SVR of 60 dB at 1 kHz, 50 dB at 10 kHz
    • Temperature range: -40 °C to 125 °C

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STMicroelectronics - LD3985

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LD3985M122R
Active
SOT23-5L Industrial Ecopack2
LD3985M18R
Active
SOT23-5L Industrial Ecopack2
LD3985M25R
Active
SOT23-5L Industrial Ecopack2
LD3985M27R
Active
SOT23-5L Industrial Ecopack2
LD3985M28R
Active
SOT23-5L Industrial Ecopack2
LD3985M29R
Active
SOT23-5L Industrial Ecopack2
LD3985M30R
Active
SOT23-5L Industrial Ecopack2
LD3985M33R
Active
SOT23-5L Industrial Ecopack2
LD3985M47R
Active
SOT23-5L Industrial Ecopack2

LD3985M122R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M18R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M25R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M27R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M28R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M29R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M30R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M33R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M47R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

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min
max
LD3985M47R Available at 2 distributors

Distributor availability ofLD3985M47R

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DIGIKEY WORLDWIDE 2445 1 Order Now
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Distributor reported inventory date: 2020-11-27

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2445

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EAR99 NEC Tape And Reel SOT23-5L -40 125 4.7 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M25R Available at 5 distributors

Distributor availability ofLD3985M25R

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DIGIKEY WORLDWIDE 5901 1 Order Now
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5901

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2609

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1

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1905

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5

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6000

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0

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Stock

6140

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1

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EAR99 NEC Tape And Reel SOT23-5L -40 125 2.5 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

CHINA

LD3985M33R Available at 9 distributors

Distributor availability ofLD3985M33R

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7774 1 Order Now
COMPEL EUROPE 4194 1 Order Now
RS COMPONENTS EUROPE 3875 5 Order Now
AVNET AMERICA 3000 0 Order Now
FUTURE WORLDWIDE 21695 1 Order Now
ARROW AMERICA 6000 3000 Order Now
MOUSER WORLDWIDE 5853 1 Order Now
Farnell Element14 EUROPE 1763 1 Order Now
RUTRONIK EUROPE 5900 3000 Order Now

Distributor reported inventory date: 2020-11-27

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DIGIKEY

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7774

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1

Region

WORLDWIDE Order Now

COMPEL

Stock

4194

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

3875

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

3000

Min.Order

0

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AMERICA Order Now

FUTURE

Stock

21695

Min.Order

1

Region

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Stock

6000

Min.Order

3000

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Stock

5853

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1

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Stock

1763

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1

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Stock

5900

Min.Order

3000

Region

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Distributor reported inventory date: 2020-11-27

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EAR99 NEC Tape And Reel SOT23-5L -40 125 3.3 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

CHINA

LD3985M122R Available at 3 distributors

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5024 1 Order Now
COMPEL EUROPE 8875 1 Order Now
MOUSER WORLDWIDE 5479 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

5024

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

8875

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5479

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-27

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EAR99 NEC Tape And Reel SOT23-5L -40 125 1.22 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M18R Available at 5 distributors

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4888 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 1070 1 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 6604 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

4888

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1070

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6604

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-27

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EAR99 NEC Tape And Reel SOT23-5L -40 125 1.8 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M30R Available at 5 distributors

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6149 1 Order Now
RS COMPONENTS EUROPE 2340 1 Order Now
AVNET AMERICA 3000 0 Order Now
MOUSER WORLDWIDE 861 1 Order Now
Farnell Element14 EUROPE 4886 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

6149

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2340

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

861

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4886

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-27

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

CHINA

LD3985M27R Available at 2 distributors

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7109 1 Order Now
MOUSER WORLDWIDE 6000 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

7109

Min.Order

1

Region

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MOUSER

Stock

6000

Min.Order

1

Region

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Distributor reported inventory date: 2020-11-27

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EAR99 NEC Tape And Reel SOT23-5L -40 125 2.7 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M29R Available at 1 distributors

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 665 1 Order Now

Distributor reported inventory date: 2020-11-23

Distributor Name

RS COMPONENTS

Stock

665

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-23

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Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.9 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M28R Available at 4 distributors

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5974 1 Order Now
RS COMPONENTS EUROPE 1085 5 Order Now
MOUSER WORLDWIDE 6720 1 Order Now
Farnell Element14 EUROPE 5843 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

5974

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1085

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6720

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5843

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-27

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.8 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M47R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2445 1 Order Now
MOUSER WORLDWIDE 3186 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

2445

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3186

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

4.7

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M25R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5901 1 Order Now
COMPEL EUROPE 2609 1 Order Now
RS COMPONENTS EUROPE 1905 5 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 6140 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

5901

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

2609

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1905

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6140

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

CHINA

LD3985M33R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7774 1 Order Now
COMPEL EUROPE 4194 1 Order Now
RS COMPONENTS EUROPE 3875 5 Order Now
AVNET AMERICA 3000 0 Order Now
FUTURE WORLDWIDE 21695 1 Order Now
ARROW AMERICA 6000 3000 Order Now
MOUSER WORLDWIDE 5853 1 Order Now
Farnell Element14 EUROPE 1763 1 Order Now
RUTRONIK EUROPE 5900 3000 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

7774

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

4194

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

3875

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

21695

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

5853

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1763

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

5900

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

CHINA

LD3985M122R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5024 1 Order Now
COMPEL EUROPE 8875 1 Order Now
MOUSER WORLDWIDE 5479 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

5024

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

8875

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5479

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

1.22

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M18R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4888 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 1070 1 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 6604 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

4888

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1070

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6604

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

1.8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M30R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6149 1 Order Now
RS COMPONENTS EUROPE 2340 1 Order Now
AVNET AMERICA 3000 0 Order Now
MOUSER WORLDWIDE 861 1 Order Now
Farnell Element14 EUROPE 4886 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

6149

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2340

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

861

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4886

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

CHINA

LD3985M27R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7109 1 Order Now
MOUSER WORLDWIDE 6000 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

7109

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

6000

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.7

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M29R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 665 1 Order Now

Distributor reported inventory date: 2020-11-23

Distributor Name

RS COMPONENTS

Stock

665

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.9

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M28R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5974 1 Order Now
RS COMPONENTS EUROPE 1085 5 Order Now
MOUSER WORLDWIDE 6720 1 Order Now
Farnell Element14 EUROPE 5843 1 Order Now

Distributor reported inventory date: 2020-11-27

Distributor Name

DIGIKEY

Stock

5974

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1085

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6720

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5843

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

0.192 / 1k

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors