LM7924 Pinout, Equivalent, Application, Datasheet

This article provides a complete, easy-to-follow guide on the LM7924 negative voltage regulator IC. You will learn its features, specifications, working principle, applications, and available alternatives. The LM7924 pinout is also clearly explained, helping beginners and professionals integrate this −24V regulator confidently into power supply designs.

Introduction

The LM7924 is a fixed-output –24V negative voltage regulator capable of supplying up to 1.5A of output current. It belongs to the popular 79xx series of negative linear regulators that provide stable output voltage with excellent line and load regulation.
It is widely used in dual-polarity power supplies, audio equipment, instrumentation circuits, and analog systems where a clean and stable –24V rail is required. With internal protection features, it ensures safe operation even in demanding conditions.

Pin Configuration / Pinout of LM7924 Power Amplifier IC

Understanding the LM7924 Pinout Configuration

The LM7924 comes in a 3-terminal TO-220 package. Correctly understanding the pinout is crucial for achieving accurate –24V regulation and preventing reverse polarity issues.

Pinout (Front View, Pins Down):

1. Ground (GND) – Common reference
2. Input (VIN) – Connects to unregulated negative DC supply
3. Output (VOUT) – Provides regulated –24V

The LM7924 pinout layout ensures smooth installation in linear power supplies with minimal external components.

Note: DATASHEET DOWNLOAD button is provided end of this article.

LM7924 Key Features

• Fixed –24V regulated output
• 1.5A output capability
• Low ripple and noise
• Built-in thermal shutdown
• Internal short-circuit protection
• Safe-area overload protection
• Excellent line and load regulation

LM7924 Specifications/Characteristics

• Output voltage: –24V regulated
• Maximum output current: 1.5A
• Input voltage range: up to –40V
• Dropout voltage: proportional to load
• Maximum power dissipation: depends on heatsink
• Junction temperature (TJ): typically 0°C to +125°C
• Storage temperature (Tstg): –55°C to +150°C
• Package type: TO-220 3-terminal

Key Applications of LM7924 Power Amplifier IC

• Dual-polarity regulated power supplies
• Operational amplifier circuits
• Audio amplifier power stages
• Industrial control systems
• Instrumentation and measurement devices
• Analog signal processing modules
• Embedded systems requiring –24V rails

LM7924 Equivalent ICs / Alternatives

(Verify pin compatibility before using substitutions)

• MC7924
• KA7924
• L7924CV
• UA7924
• Any fixed –24V, 1A–1.5A linear negative regulator

More Circuit Layouts

Working Principle of LM7924

The LM7924 operates as a linear negative voltage regulator. It uses an internal reference, error amplifier, and pass transistor to maintain a constant –24V output regardless of load changes or input voltage fluctuations.
If the regulator overheats or experiences excessive current draw, protection circuits activate automatically, ensuring safe and continuous operation. When paired with recommended capacitors, the IC delivers a clean and noise-free –24V rail suitable for analog and digital applications.

Frequently Asked Questions (FAQ)

Q1: What is the output voltage of LM7924?
It provides a regulated –24V DC output.

Q2: What input voltage is required?
Typically between –27V and –40V for proper regulation.

Q3: Does LM7924 need a heatsink?
Yes, especially at higher current draw or high input-to-output voltage difference.

Q4: What capacitors are required?
Commonly 0.33µF on the input and 0.1–1µF on the output for stable operation.

Conclusion

The LM7924 is a reliable −24V fixed negative voltage regulator suited for audio, analog, industrial, and dual-supply applications. Its stable performance, internal protection features, and simple pinout make it ideal for power supply designs requiring a clean –24V output. With proper understanding of specifications and pin connections, it can be confidently used in a wide range of electronic circuits.

Datasheet of LM7924 Power Amplifier IC

Click the following Button below to download the datasheet of LM7924 :

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