LD3985

Active

Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible

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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.

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LD3985M47R Available at 2 distributors

Distributor availability ofLD3985M47R

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DIGIKEY WORLDWIDE 2430 1 Order Now
MOUSER WORLDWIDE 2831 1 Order Now

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DIGIKEY

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2430

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EAR99 NEC Tape And Reel SOT23-5L -40 125 4.7 0.192 / 1k
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Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M25R Available at 6 distributors

Distributor availability ofLD3985M25R

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DIGIKEY WORLDWIDE 5901 1 Order Now
COMPEL EUROPE 2599 1 Order Now
RS COMPONENTS EUROPE 1895 5 Order Now
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MOUSER WORLDWIDE 6038 1 Order Now

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5901

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2599

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1895

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6000

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102000

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0

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6038

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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 6 distributors

Distributor availability ofLD3985M33R

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1410 1 Order Now
COMPEL EUROPE 3013 1 Order Now
RS COMPONENTS EUROPE 945 5 Order Now
FUTURE WORLDWIDE 6695 1 Order Now
MOUSER WORLDWIDE 7676 1 Order Now
Farnell Element14 EUROPE 1763 1 Order Now

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DIGIKEY

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1410

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1

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WORLDWIDE Order Now

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3013

Min.Order

1

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EUROPE Order Now

RS COMPONENTS

Stock

945

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5

Region

EUROPE Order Now

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Stock

6695

Min.Order

1

Region

WORLDWIDE Order Now

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Stock

7676

Min.Order

1

Region

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Farnell Element14

Stock

1763

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1

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EUROPE Order Now

Distributor reported inventory date: 2021-01-20

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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 8842 1 Order Now
MOUSER WORLDWIDE 5375 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

5024

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

8842

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5375

Min.Order

1

Region

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Distributor reported inventory date: 2021-01-20

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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 4568 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 765 1 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 6599 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

4568

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

765

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6599

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-01-20

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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 3059 1 Order Now
RS COMPONENTS EUROPE 2335 1 Order Now
AVNET AMERICA 3000 0 Order Now
MOUSER WORLDWIDE 6845 1 Order Now
Farnell Element14 EUROPE 4826 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

3059

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2335

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6845

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4826

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-01-20

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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 5910 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

7109

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5910

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-01-20

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Active
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: 2021-01-18

Distributor Name

RS COMPONENTS

Stock

665

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-01-18

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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 1080 5 Order Now
MOUSER WORLDWIDE 6710 1 Order Now
Farnell Element14 EUROPE 5803 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

5974

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1080

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6710

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5803

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-01-20

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 2430 1 Order Now
MOUSER WORLDWIDE 2831 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

2430

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2831

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-01-20

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 2599 1 Order Now
RS COMPONENTS EUROPE 1895 5 Order Now
AVNET AMERICA 6000 0 Order Now
ARROW EUROPE 102000 0 Order Now
MOUSER WORLDWIDE 6038 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

5901

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

2599

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1895

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

102000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6038

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-01-20

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 1410 1 Order Now
COMPEL EUROPE 3013 1 Order Now
RS COMPONENTS EUROPE 945 5 Order Now
FUTURE WORLDWIDE 6695 1 Order Now
MOUSER WORLDWIDE 7676 1 Order Now
Farnell Element14 EUROPE 1763 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

1410

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

3013

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

945

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

6695

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

7676

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1763

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-01-20

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 8842 1 Order Now
MOUSER WORLDWIDE 5375 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

5024

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

8842

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5375

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-01-20

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 4568 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 765 1 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 6599 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

4568

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

765

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6599

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-01-20

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 3059 1 Order Now
RS COMPONENTS EUROPE 2335 1 Order Now
AVNET AMERICA 3000 0 Order Now
MOUSER WORLDWIDE 6845 1 Order Now
Farnell Element14 EUROPE 4826 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

3059

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2335

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6845

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4826

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-01-20

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 5910 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

7109

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5910

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-01-20

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: 2021-01-18

Distributor Name

RS COMPONENTS

Stock

665

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-01-18

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 1080 5 Order Now
MOUSER WORLDWIDE 6710 1 Order Now
Farnell Element14 EUROPE 5803 1 Order Now

Distributor reported inventory date: 2021-01-20

Distributor Name

DIGIKEY

Stock

5974

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1080

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6710

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5803

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-01-20

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