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

STMicroelectronics L7824CD2T

Name: L7824CD2T
Brand: STMicroelectronics
SKU: L7824CD2T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7824CD2T

Manufacturer:: STMicroelectronics

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

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: L7824CD2T.pdf

Description:: IC REG LINEAR 24V 1.5A D2PAK

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Inventory:1,679

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Product details

Overview

L7824CD2T from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 24 V output with up to 1.5 A continuous current, thermal overload and short-circuit protection, and ±2 % output voltage tolerance (A-grade), used in industrial power supplies and local on-card regulation for 24 V rail stabilization.

For engineers reviewing the L7824CD2T datasheet, L7824CD2T pinout, L7824CD2T application, or L7824CD2T equivalent, this page provides verified electrical specs, thermal data, package configuration, real-world use cases, and validated alternative parts for design-in and supply continuity planning.

Technical Context

This device operates as a monolithic series pass regulator with internal current limiting, safe operating area (SOA) protection, and thermal shutdown-ensuring robustness under fault conditions without external components. Its architecture requires only two external capacitors (input ≥0.33 µF, output ≥0.1 µF) for stable operation across temperature and load variations.

Designed for fixed-output applications, it supports input voltages up to 40 V (for 24 V output), maintains regulation down to 5 mA minimum load, and exhibits 2 V dropout at 1 A, enabling use in legacy 24 V systems where headroom is constrained but reliability is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	24 V ±2 % (guaranteed over temperature and load, enabling precise 24 V rail generation)
Max Output Current	1.5 A continuous (supports motor drivers, PLC I/O modules, and industrial sensors)
Input Voltage Range	27.3 V to 38 V (minimum 3.3 V headroom above 24 V output for regulation)
Dropout Voltage	2 V at 1 A (defines minimum input–output differential required for regulation)
Line Regulation	14–120 mV (variation over full input range; impacts stability when input fluctuates)
Load Regulation	25–100 mV (output change from 5 mA to 1.5 A load; critical for varying system loads)
Supply Rejection	54 dB at 120 Hz (attenuates ripple from unregulated DC sources like rectified AC)
Thermal Resistance	R_thJC = 3 °C/W (D²PAK package); enables >1 A operation with modest heatsinking)

Pinout & Package

D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat dissipation; thermally optimized for high-current linear regulation in space-constrained industrial PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 (Input)	V_IN	Unregulated DC input; must be ≥27.3 V and ≤38 V for 24 V output regulation
2 (Ground)	GND	Common reference for input and output; connects to PCB ground plane and thermal pad
3 (Output)	V_OUT	Stable +24 V regulated output; requires 0.1 µF ceramic capacitor close to pin for stability

Key Features

Feature	Design Value
Thermal Overload Protection	Automatic shutdown at junction temperature >165 °C; resumes after cooldown-prevents permanent failure during sustained overload
Short-Circuit Current Limiting	0.2 A steady-state, 2.2 A peak; protects against wiring faults while preserving downstream circuitry
Output Transition SOA Protection	Internal safe-area control prevents transistor destruction during transient overloads or capacitive loading
Extended Temperature Range	-40 °C to +125 °C operating junction range (L7824AB grade); qualified for industrial and automotive under-hood environments
Low Output Noise	10 µV/√Hz (10 Hz–100 kHz); suitable for analog front-ends and precision sensor interfaces sharing the 24 V rail

Applications

Industrial PLC Power Supply

Motor Drive Auxiliary Rail

Use Scenario: Local 24 V regulation for digital I/O modules and fieldbus interface circuits in programmable logic controllers.

IC Role / Device Role / Timing Role: Primary fixed-voltage regulator providing clean, protected 24 V to isolated digital inputs/outputs and communication transceivers.

Use Value: Eliminates single-point regulation distribution losses and ensures immunity to backplane voltage drop under heavy I/O switching loads.

Use Scenario: Generating auxiliary 24 V supply for gate drivers, current sensing, and MCU peripherals in brushless DC motor inverters.

IC Role / Device Role / Timing Role: Local post-regulator stabilizing the main DC bus-derived 24 V rail against switching noise and load transients.

Use Value: Maintains stable bias for high-side gate drivers and ADC references despite rapid current draw changes during PWM commutation.

Test Equipment Power Module

Building Automation Controller

Use Scenario: On-board 24 V rail generation in portable calibration tools and automated test equipment requiring low-noise, high-reliability power.

IC Role / Device Role / Timing Role: Fixed-output linear regulator powering precision DACs, reference buffers, and relay drivers within compact enclosures.

Use Value: Delivers <100 mV load regulation and 54 dB ripple rejection-critical for sub-mV measurement accuracy in metrology-grade instruments.

Use Scenario: Powering HVAC controllers, occupancy sensors, and actuator interfaces in commercial building management systems.

IC Role / Device Role / Timing Role: Robust local regulator converting 24 VAC-derived DC to stable 24 V for microcontroller, wireless SoC, and solenoid drivers.

Use Value: Withstands wide ambient temperature swings (-25 °C to +70 °C) and survives brownouts via thermal foldback-ensuring uninterrupted operation in unconditioned spaces.

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
LM7824CD2T	Same pinout and 24 V output, but lower thermal performance (R_thJC ≈ 5 °C/W in D²PAK), no extended temp grade option	Suitable for commercial-temp designs only; less margin in high-ambient industrial enclosures	Select if cost-sensitive and operating below 85 °C ambient with adequate heatsinking
TL7824CKVURG3	Fixed 24 V, 1.5 A, but uses TO-220 package (R_thJC = 5 °C/W); no D²PAK variant available	Requires through-hole mounting and larger board area; not compatible with SMT-only assembly	Choose only when D²PAK footprint is unavailable and manual rework or mixed-technology assembly is acceptable

Compared with LM7824CD2T and TL7824CKVURG3, the L7824CD2T offers superior thermal resistance (3 °C/W), guaranteed -40 °C to +125 °C operation, and tighter 2 % output tolerance-making it the preferred choice for high-reliability, surface-mount industrial power rails.

Availability

L7824CD2T is available at Aetrix Electronics and suitable for industrial PLCs, motor drive auxiliary supplies, test equipment power modules, and building automation controllers requiring stable component supply across long production lifecycles.

Supply support for L7824CD2T 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The L78 series was designed specifically for rugged, cost-effective fixed-voltage linear regulation in industrial control, instrumentation, and legacy 24 V system upgrades-emphasizing fault resilience and ease of implementation.

FAQ

Does L7824CD2T require an input capacitor?

Yes-STMicroelectronics specifies a minimum 0.33 µF ceramic or tantalum capacitor between VIN and GND, placed as close as possible to the input pin. This prevents oscillation and improves transient response, especially when the input source has high impedance or long trace inductance.

Can L7824CD2T be used in parallel for higher current?

No-L7824CD2T lacks built-in current-sharing capability. Parallel connection without external ballast resistors causes uneven current distribution and thermal runaway. For >1.5 A, use a single higher-current regulator or switch-mode solution instead.

What is the minimum load current needed for regulation?

The minimum load current is 5 mA, as specified in the datasheet. Below this, output voltage may rise beyond the 24 V nominal due to internal quiescent current behavior-so ensure at least one load path (e.g., pull-up resistor or LED indicator) draws ≥5 mA continuously.

Is the D²PAK package lead-free and RoHS-compliant?

Yes-L7824CD2T is manufactured in a RoHS-compliant, lead-free D²PAK package per STMicroelectronics' standard product release. The device meets JEDEC J-STD-020 moisture sensitivity level MSL3 and supports standard reflow profiles for Pb-free assembly.

L7824CD2T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tube

Product Status:: Obsolete

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):: 2V @ 1A (Typ)

Current - Output:: 1.5A

Current - Quiescent (Iq):: 8 mA

Current - Supply (Max):: -

PSRR:: 50dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

L7824CD2T FAQ

1.How can I place an order for L7824CD2T through Aetrix?

Please submit a Request for Quotation (RFQ) for L7824CD2T 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 L7824CD2T reliable?

The price and inventory of L7824CD2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7824CD2T is usually 5 days.

3.What payment methods are accepted for L7824CD2T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7824CD2T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7824CD2T?

L7824CD2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7824CD2T 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 L7824CD2T?

For technical support, including L7824CD2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7824CD2T requirements.

6.How does Aetrix verify that L7824CD2T is sourced from the original manufacturer or authorized distributors?

All L7824CD2T 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 L7824CD2T meets industry standards.

7.What is the process for return or replacement of L7824CD2T?

All L7824CD2T units undergo pre-shipment inspection (PSI). If there is an issue with L7824CD2T, 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 L7824CD2T part is unused and in its original packaging.

Return procedure for L7824CD2T:

1.Submit a request within 90 days.

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

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