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  • The LK112S is a low-dropout linear regulator with shutdown function. The internal switch can be controlled by TTL or CMOS logic levels. The device is ON when the control pin is pulled to a high logic level. An external capacitor can be connected to the noise bypass pin to reduce the output noise level to 30 μVrms. An internal PNP pass transistor is used to achieve a low-dropout voltage.

    The LK112S has a very low quiescent current in ON mode while in OFF mode the Iqis reduced to 100 nA max. The internal thermal shutdown circuitry limits the junction temperature below 150 °C. The load current is internally monitored and in the presence of a short-circuit or overcurrent conditions at the output, the device shuts down.

    Key Features

    • Output current up to 200 mA
    • Low-dropout voltage (500 mV max. at IOUT = 200 mA)
    • Very low quiescent current: 0.1 μA in OFF mode and max. 250 μA in ON mode at IOUT = 0 mA
    • Low output noise: typ. 30 μV at IOUT = 60 mA and 10 Hz < f < 80 kHz
    • Wide range of output voltages
    • Internal current and thermal limit
    • VOUT tolerance ± 2% (at 25 °C)
    • Operative input voltage from: VOUT + 0.5 to 14 V (for VOUT > 2 V) or from 2.5 V to 14 V (for VOUT < 2 V)

Recommended for you

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS2395
      Low noise and low drop voltage regulator with shutdown function
      12.0
      352.55 KB
      PDF
      DS2395

      Low noise and low drop voltage regulator with shutdown function

Publications and Collaterals

    • Description Version Size Action
      Linear and Switching Voltage Regulators Selection Guide 3.0
      370.88 KB
      PDF

      Linear and Switching Voltage Regulators Selection Guide

    • Description Version Size Action
      Low-dropout (LDO) linear voltage regulators Quick Reference Guide 2.1
      1.78 MB
      PDF
      Power management for handheld and portable 2.0
      1.09 MB
      PDF

      Low-dropout (LDO) linear voltage regulators Quick Reference Guide

      Power management for handheld and portable

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LK112SM18TR
Active
SOT23-5L Industrial Ecopack2
LK112SM33TR
Active
SOT23-5L Industrial Ecopack2
LK112SM50TR
Active
SOT23-5L Industrial Ecopack2

LK112SM18TR

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LK112SM33TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LK112SM50TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

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

Part Number
Order from Distributors
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ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Output Voltage (V) (nom)
Budgetary Price (US$)*/Qty
More info
min
max
LK112SM50TR Available at 6 distributors

Distributor availability ofLK112SM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1017 1 Order Now
RS COMPONENTS EUROPE 650 5 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 4221 1 Order Now
Farnell Element14 EUROPE 3332 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

1017

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

650

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4221

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3332

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

Buy now
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 5 0.24 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.2

Unit Price (US$):

0.24

Country of Origin:

MALAYSIA

LK112SM18TR Available at 2 distributors

Distributor availability ofLK112SM18TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2840 1 Order Now
Farnell Element14 EUROPE 962 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

MOUSER

Stock

2840

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

962

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

Buy now
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 1.8 0.24 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.2

Unit Price (US$):

0.24

Country of Origin:

MALAYSIA

LK112SM33TR Available at 6 distributors

Distributor availability ofLK112SM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 13935 1 Order Now
RS COMPONENTS EUROPE 1340 1 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
ARROW EUROPE 6000 0 Order Now
MOUSER WORLDWIDE 5722 1 Order Now
Farnell Element14 EUROPE 329 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

13935

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1340

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

5722

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

329

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

Buy now
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3.3 0.24 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.2

Unit Price (US$):

0.24

Country of Origin:

CHINA

LK112SM50TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.24 / 1k

Distributor availability ofLK112SM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1017 1 Order Now
RS COMPONENTS EUROPE 650 5 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 4221 1 Order Now
Farnell Element14 EUROPE 3332 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

1017

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

650

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4221

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3332

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.2

Budgetary Price (US$)* / Qty

0.24 / 1k

Country of Origin

MALAYSIA

LK112SM18TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.24 / 1k

Distributor availability ofLK112SM18TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2840 1 Order Now
Farnell Element14 EUROPE 962 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

MOUSER

Stock

2840

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

962

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

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)

0.2

Budgetary Price (US$)* / Qty

0.24 / 1k

Country of Origin

MALAYSIA

LK112SM33TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.24 / 1k

Distributor availability ofLK112SM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 13935 1 Order Now
RS COMPONENTS EUROPE 1340 1 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
ARROW EUROPE 6000 0 Order Now
MOUSER WORLDWIDE 5722 1 Order Now
Farnell Element14 EUROPE 329 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

13935

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1340

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

5722

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

329

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

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)

0.2

Budgetary Price (US$)* / Qty

0.24 / 1k

Country of Origin

CHINA

(*) 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