LM3940IS-3.3

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LM3940IS-3.3

IC REG LIN 3.3V 1A DDPAK/TO263-3

  • Fabricante
  • Mfr. Parte #LM3940IS-3.3
  • Paquete TO-263 (KTT)-3
  • Hoja de datos
  • En stock7027

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Especificaciones

Package Tube
ProductStatus Not For New Designs
OutputConfiguration Positive
OutputType Fixed
NumberofRegulators 1
Voltage-Input(Max) 7.5V
Voltage-Output(Min/Fixed) 3.3V
VoltageDropout(Max) 0.2V @ 100mA
Current-Output 1A
ProtectionFeatures Over Temperature, Short Circuit
OperatingTemperature -40°C ~ 125°C
MountingType Surface Mount
Package/Case TO-263-4, D²Pak (3 Leads + Tab), TO-263AA

Descripción general

Description

LM3940IS-3.3 is a fixed 3.3 V low‑dropout regulator (LDO) from TI/National. It provides a stable 3.3 V rail from a higher input supply for digital logic and microcontrollers.
Key points:
- Fixed output: 3.3 V
- Input range: up to about 26 V (includes automotive-type transients with proper input filtering)
- Output current: typically up to ~1 A
- Dropout: roughly 0.4–0.5 V at higher load
- Protections: current limit and thermal/shutdown protection
- Package: IS (surface-mount, 3-terminal; pinout depends on package—check the datasheet)
Common uses: automotive and general embedded systems needing a reliable 3.3 V supply from higher-voltage sources.
Note: for exact electrical specs, package details, and pinout, consult the LM3940IS-3.3 datasheet.

Features

- Fixed 3.3 V output
- 1 A maximum output current
- Low dropout regulator (typical dropout ~0.5 V at full load)
- Wide input range (suitable for automotive environments; up to ~26 V)
- Internal current limit and thermal/shutdown protection
- Safe-area protection
- Requires external output capacitor for stability (low ESR, typically around 22 µF) plus input decoupling
- Package: IS (surface-mount) format

Package

SOT-223 surface-mount package.

Pinout

- Pin count: 3 pins
- Function: Fixed 3.3V low-dropout regulator (LDO). It takes a higher input voltage and provides a regulated 3.3V output with a ground pin. Pin order varies by package; typically Vin, GND, Vout. Check the datasheet for the exact pinout in your package.

Manufacturer

- Manufacturer: Texas Instruments (TI).
- About the company: TI is a multinational American semiconductor company that designs and manufactures analog and embedded processing integrated circuits; it acquired National Semiconductor (the original LM3940 maker) in 2011.

Application

- Fixed 3.3V low-dropout regulator
- Powers 3.3V logic for MCUs, memory, DSPs, and analog ICs (ADC/DAC)
- Local 3.3V rail on embedded boards and development kits
- Automotive and industrial electronics needing a stable 3.3V supply
- Battery-powered/portable devices requiring a compact, efficient 3.3V regulator

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