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L78M24CV

Name: L78M24CV
Rating: 4.7 (12 reviews)

IC REG LINEAR 24V 500MA TO220AB

製造商
製造商。部分 #L78M24CV
包 TO-220-3
資料表 L78M24CV DataSheet
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規格

Package	Tube
ProductStatus	Active
OutputConfiguration	Positive
OutputType	Fixed
NumberofRegulators	1
Voltage-Input(Max)	40V
Voltage-Output(Min/Fixed)	24V
Current-Output	500mA
Current-Quiescent(Iq)	6 mA
PSRR	50dB (120Hz)
ProtectionFeatures	Over Current, Over Temperature, Short Circuit
OperatingTemperature	0°C ~ 125°C
MountingType	Through Hole
Package/Case	TO-220-3

概述

Description

The L78M24CV is a fixed positive linear voltage regulator from ST’s 78M family. It provides a regulated +24 V output from a higher DC input with three pins (and a tab) and is designed for 1.5 A class loads.
Key points:
- Output: +24 V, up to about 1.5 A (typical).
- Input range: up to ≈35 V (absolute max around 40 V). Dropout is ~2 V at full load, so Vin must be ≈26–28 V or higher.
- Package: commonly TO-220 (and D²PAK) variants; pinout—Input, Ground, Output (front view).
- Protections: current limit/short-circuit protection and thermal shutdown; safe operating area protection.
- Stability: requires input and output decoupling capacitors (e.g., 0.33 µF input, 0.1 µF output; larger caps may be used for transient loads).
- Applications: simple 24 V regulator rails for microcontroller and embedded systems, industrial controls, and any design needing a fixed 24 V supply.
- Note: Power dissipation is (Vin − 24 V) × Iout, so adequate heat sinking is important.

Features

Here are the main features of L78M24CV:
- Fixed output: 24 V
- Output current: up to about 1.5 A (continuous)
- Input voltage range: up to 35 V (typical); dropout ≈ 2 V at full load
- 3-terminal positive regulator (Vin, GND, Vout); no external components needed
- Tab is typically connected to Vout
- Protection: current limiting, thermal overload/shutdown, short-circuit protection
- Operating temperature: -40 °C to +125 °C
- Package: TO-220 (also available in other variants); suitable for heatsinking
Notes: For 24 V output, ensure Vin is sufficiently above Vout (≈26 V minimum under load) and provide adequate heatsinking at higher loads.

Package

TO-220AB through-hole plastic package.

Pinout

- Pin count: 3 pins.
- Function: Fixed positive linear voltage regulator that outputs +24 V. Handles up to ~1.5 A (max), with input up to about 35 V and ~2 V dropout at full load. Pinout (front view): left Vin, middle Gnd, right Vout.

Manufacturer

- Manufacturer: STMicroelectronics.
- What kind of company: A multinational electronics and semiconductor company that designs, develops, and manufactures semiconductor devices and ICs.

Application

Typical application areas for L78M24CV:
- Fixed 24V regulator to derive a stable 24V rail from a higher DC input in industrial automation and control.
- Automotive/24V electrical systems as a pre-regulator or main supply.
- Front-end power-supply modules, bench supplies, and test equipment.
- Instrumentation, sensors, actuators, motor drivers, and PLCs requiring a 24V rail.
- Telecommunication and embedded systems operating from 24V.
- Education/hobby projects needing an easy 24V regulator.

Equivalent

Equivalent parts are other 24V fixed regulators in the 78M family. Common replacements:
- LM7824 / LM78M24 (TI/National)
- NCP7824 (Onsemi)
- KA78M24 (Renesas/others)
Note: pinouts and thermal specs can vary by vendor; always check the datasheet before substituting.