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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics L78M24CV-DG

Name: L78M24CV-DG
Brand: STMicroelectronics
SKU: L78M24CV-DG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L78M24CV-DG

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-220-3

Datasheet:: L78M24CV-DG.pdf

Description:: IC REG LINEAR 24V 500MA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L78M24CV-DG from STMicroelectronics is a three-terminal positive fixed-voltage linear regulator delivering 24 V at up to 0.5 A output current, featuring thermal overload protection, short-circuit protection, and safe operating area (SOA) compensation. It operates with a 2 V dropout voltage, ±2 % output voltage tolerance (AB/AC versions), and supports junction temperatures from –40 °C to +125 °C - used in industrial power rails, embedded control modules, and local point-of-load regulation.

For engineers reviewing the L78M24CV-DG datasheet, L78M24CV-DG pinout, L78M24CV-DG application, or L78M24CV-DG equivalent, key selection considerations include input voltage range (up to 40 V), thermal resistance (5 °C/W junction-to-case in TO-220FP), load regulation (240 mV max at 5–200 mA), ripple rejection (50 dB at 120 Hz), and quiescent current (6 mA typical).

Technical Context

The L78M24CV-DG implements a monolithic NPN pass transistor architecture with internal current limiting, thermal shutdown, and SOA protection - enabling robust operation without external protection circuitry. Its fixed 24 V output is trimmed during production to ±2 % tolerance for AB/AC variants, and it maintains regulation across input voltages from 27 V to 38 V at rated load.

Designed for local on-card regulation, it eliminates centralized supply distribution issues and supports stable operation with only 0.33 µF input and 0.1 µF output capacitors. The device exhibits –1.2 mV/°C output voltage drift over 0–125 °C and delivers 170 µV RMS output noise (10 Hz–100 kHz).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	24 V ±2 % (AB version); ensures precise rail generation for 24 V logic or sensor interfaces
Max Output Current	0.5 A continuous; sufficient for microcontroller peripherals, relays, and analog front-ends
Dropout Voltage	2 V at 200 mA and 25 °C; enables operation with 26 V minimum input for 24 V output
Input Voltage Range	27 V to 38 V (recommended), absolute max 40 V; compatible with unregulated 28 V or 36 V supplies
Load Regulation	240 mV (5–200 mA, 25 °C); limits output variation under dynamic load steps in industrial I/O
Supply Ripple Rejection	50 dB at 120 Hz; suppresses low-frequency AC line noise in transformer-based supplies
Quiescent Current	6 mA typical; minimizes standby power loss in always-on control systems
Thermal Resistance (J-C)	5 °C/W (TO-220FP package); allows >0.5 A operation with moderate heatsinking

Pinout & Package

Supplied in TO-220FP (IPAK) package - a full-molded, isolated-tab variant of TO-220 with improved thermal performance and creepage clearance for industrial safety compliance.

Pin/Terminal	Circuit Role	Design Meaning
1 (Input)	Unregulated DC input	Accepts 27–38 V DC; requires ≥0.33 µF bypass capacitor placed adjacent to pin
2 (Ground)	Circuit common reference	Low-impedance return path; must be routed with minimal trace inductance to avoid instability
3 (Output)	Regulated 24 V output	Delivers up to 0.5 A; benefits from 0.1 µF ceramic capacitor at load for transient response

Key Features

Feature	Design Value
Thermal Overload Protection	Automatic shutdown above safe junction temperature; recovers autonomously after cooldown
Short-Circuit Current Limit	240 mA typical (VI = 35 V); prevents damage during sustained output faults
Safe Operating Area Compensation	Reduces peak short-circuit current as input-output differential increases - protects pass transistor
Extended Temperature Range	–40 °C to +125 °C operation (AB grade); qualified for industrial and automotive under-hood environments
Low Output Noise	170 µV RMS (10 Hz–100 kHz); suitable for noise-sensitive analog signal chains and ADC references

Applications

Industrial PLC I/O Module

Automotive Body Control Unit

Use Scenario: Powering digital isolators, optocouplers, and 24 V field sensors in modular PLC backplanes.

IC Role / Device Role / Timing Role: Local 24 V rail generator providing clean, protected supply independent of main system PSU.

Use Value: Eliminates ground loops and noise coupling from shared 24 V bus; thermal shutdown prevents field failure during connector shorts.

Use Scenario: Supplying microcontroller peripherals and CAN transceivers in body electronics modules.

IC Role / Device Role / Timing Role: Secondary regulated rail derived from vehicle battery (12 V nominal, up to 16 V), boosted via external DC-DC stage to 24 V.

Use Value: ±2 % output tolerance ensures reliable logic-level compatibility; –40 °C to +125 °C rating meets AEC-Q100 Grade 2 requirements.

Medical Infusion Pump Controller

Factory Automation Sensor Hub

Use Scenario: Generating isolated 24 V for stepper motor drivers and pressure transducers in Class II medical equipment.

IC Role / Device Role / Timing Role: Safety-isolated auxiliary regulator feeding critical actuation subsystems.

Use Value: Internal SOA protection prevents latch-up during motor stall events; 5 °C/W R_thJC enables compact heatsink design within enclosure thermal limits.

Use Scenario: Powering multiple 4–20 mA loop-powered sensors and RS-485 transceivers in distributed I/O cabinets.

IC Role / Device Role / Timing Role: Centralized local regulator per sensor group, reducing wiring complexity and EMI susceptibility.

Use Value: 50 dB ripple rejection suppresses switching noise from nearby SMPS; 240 mV load regulation maintains sensor excitation accuracy across varying channel counts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM78M24CDT-TR	±4 % output tolerance (C grade), 0–125 °C operating range, TO-252 (DPAK) package with R_thJA = 100 °C/W	Lower precision and thermal performance; suited for cost-sensitive non-critical 24 V rails	Select when budget constraints outweigh tight regulation and extended temp needs
MC78M24BDTG	±2 % tolerance (B grade), –40 °C to +125 °C, TO-220 package (non-FP), R_thJC = 5 °C/W but no isolation between tab and pin 2	Requires insulating hardware for grounded heatsinks; identical electrical specs but mechanical mounting differs	Choose when legacy TO-220 footprint compatibility is required and thermal isolation is managed externally

Compared with LM78M24CDT-TR, L78M24CV-DG offers tighter regulation and superior thermal capability; versus MC78M24BDTG, it provides integrated electrical isolation in the TO-220FP package - simplifying heatsink implementation in grounded-chassis industrial designs.

Availability

L78M24CV-DG is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, medical infusion pumps, and factory automation sensor hubs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for L78M24CV-DG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.

L78M24CV-DG belongs to the L78M Precision 500 mA regulator family - engineered for robust local regulation in harsh environments where reliability, thermal resilience, and protection integrity are critical.

FAQ

What is the maximum allowable input voltage for continuous operation?

The L78M24CV-DG supports a recommended input voltage range of 27 V to 38 V DC. Its absolute maximum DC input voltage is 40 V - exceeding this risks permanent damage even with brief transients. For reliable long-term operation at 0.5 A, input should not exceed 38 V to maintain junction temperature below 125 °C with standard heatsinking.

Does this regulator require an output capacitor for stability?

No, the L78M24CV-DG is internally compensated and does not require an output capacitor to maintain stability. However, a 0.1 µF ceramic capacitor placed close to the output pin significantly improves transient response to load steps - especially important in microcontroller or sensor applications with pulsed current demands.

How does thermal protection behave during overload conditions?

When junction temperature exceeds ~165 °C, the L78M24CV-DG activates thermal shutdown, cutting output current to near zero. It remains latched off until junction temperature falls by ~10 °C, then resumes regulation automatically. This cycle repeats if overheating persists - protecting both the IC and downstream circuitry without external intervention.

Can L78M24CV-DG be used in adjustable configurations?

Yes - though optimized as a fixed 24 V regulator, it can be configured as an adjustable regulator using external resistors per Figure 19 and Figure 20 in DS0425. Output voltage becomes VO = 24 V × (1 + R2/R1) + I_dR2, where I_d ≈ 6 mA. Accuracy degrades due to reference drift and quiescent current error, so precision applications require calibration or dedicated adjustable regulators.

L78M24CV-DG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 24V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 500mA

Current - Quiescent (Iq):: 6 mA

Current - Supply (Max):: -

PSRR:: 50dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

L78M24CV-DG FAQ

1.How can I place an order for L78M24CV-DG through Aetrix?

Please submit a Request for Quotation (RFQ) for L78M24CV-DG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for L78M24CV-DG reliable?

The price and inventory of L78M24CV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78M24CV-DG is usually 5 days.

3.What payment methods are accepted for L78M24CV-DG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78M24CV-DG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L78M24CV-DG?

L78M24CV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L78M24CV-DG order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for L78M24CV-DG?

For technical support, including L78M24CV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78M24CV-DG requirements.

6.How does Aetrix verify that L78M24CV-DG is sourced from the original manufacturer or authorized distributors?

All L78M24CV-DG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L78M24CV-DG meets industry standards.

7.What is the process for return or replacement of L78M24CV-DG?

All L78M24CV-DG units undergo pre-shipment inspection (PSI). If there is an issue with L78M24CV-DG, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The L78M24CV-DG part is unused and in its original packaging.

Return procedure for L78M24CV-DG:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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