L4940   Product is in volume production.

1.5 A very low drop voltage regulator IC

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The L4940 series of three-terminal positive regulators is available in TO-220 and D²PAK packages and with several fixed output voltages, making it useful in a wide range of industrial and consumer applications. Thanks to their very low input/output voltage drop, these devices are particularly suitable for battery-powered equipment, reducing consumption and prolonging battery-life. Each type employs internal current limiting, anti-saturation circuit, thermal shutdown and safe area protection.

Key Features

  • Precise 5, 8.5, 12 V outputs
  • Low dropout voltage (450 mV typ. at 1 A)
  • Very low quiescent current
  • Thermal shutdown
  • Short-circuit protection
  • Reverse polarity protection

Resources

Technical Documentation

Product Specifications
Description Version Size
DS0420 DS0420: 1.5 A very low drop voltage regulator IC 14.0 1 MB

Publications and Collaterals

Selection Guides
Description Version Size
Linear and Switching Voltage Regulators Selection Guide 3.0 370 KB
Brochures
Description Version Size
Brochure Power management guide 10.2018 4 MB
Low-dropout (LDO) linear voltage regulators - Quick Reference Guide 2.2 216 KB
Power management for handheld and portable 2.0 1 MB
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Sample & Buy

Part Number Package Packing Type Output Voltage (V) (nom) Output Tolerance (typ) Output Current (A) (nom) Marketing Status Unit Price (US$) * Quantity ECCN (US) Country of Origin More info Order from ST Order from Distributors
L4940V5 TO-220 Tube 5 2 1.5 Active 0.578 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
L4940D2T12-TR D2PAK Tape And Reel 12 2 1.5 Active 0.497 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
L4940D2T5-TR D2PAK Tape And Reel 5 2 1.5 Active 0.497 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
L4940V85 TO-220 Tube 8.5 2 1.5 Active 0.578 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
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(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4940V5 ActiveTO-220IndustrialEcopack1 0 0
L4940D2T12-TR ActiveD2PAKIndustrialEcopack2
L4940D2T5-TR ActiveD2PAKIndustrialEcopack2
L4940V85 ActiveTO-220IndustrialEcopack1
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(**) 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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