LM7924CT Linear Voltage Regulator

Part Overview

The LM7924CT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative output of -24V at 1A. This through-hole component operates across a temperature range of 0°C to 125°C and features integrated protection against over-temperature and short-circuit conditions. The device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM7924CT
Manufacturer	onsemi
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Configuration	Negative
Voltage - Output (Fixed)	-24V
Current - Output	1A
Voltage - Input (Max)	-35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Operating Temperature	0°C ~ 125°C
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the LM7924CT is determined by the following critical parameters:

Output Voltage: Must be fixed at -24V
Output Current: Must be rated for 1A
Package Type: Must be TO-220-3 through-hole configuration
Output Configuration: Must be negative polarity
Operating Temperature Range: Must support 0°C to 125°C minimum
Mounting Type: Must be through-hole compatible

The MC7924CTG meets all substitution criteria, maintaining electrical and mechanical compatibility with the original LM7924CT specification.

Parameter Comparison

Parameter	LM7924CT	MC7924CTG
Manufacturer	onsemi	onsemi
Voltage - Output (Fixed)	-24V	-24V
Current - Output	1A	1A
Voltage - Input (Max)	-35V	-40V
Voltage Dropout (Max)	2V @ 1A (Typ)	1.3V @ 1A (Typ)
Current - Quiescent (Iq)	6 mA	Not specified
PSRR	60dB (120Hz)	56dB (120Hz)
Protection Features	Over Temperature, Short Circuit	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C
Package / Case	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Obsolete

Engineering Selection Recommendations

Both the LM7924CT and MC7924CTG are classified as obsolete products from onsemi. The MC7924CTG serves as a direct functional equivalent, maintaining identical output voltage, current rating, and package configuration. The MC7924CTG demonstrates improved performance characteristics, including lower maximum dropout voltage (1.3V versus 2V) and expanded maximum input voltage rating (-40V versus -35V). Both devices carry REACH Unaffected status and EAR99 ECCN classification. Selection between these parts should be based on circuit requirements for dropout voltage performance and input voltage headroom, with the MC7924CTG offering superior specifications in both areas.

Frequently Asked Questions (FAQ)

Q: Can MC7924CTG replace LM7924CT in existing designs?

A: Yes. Both devices provide identical -24V fixed output at 1A in TO-220-3 through-hole packaging. Electrical and mechanical compatibility is maintained across all critical parameters.

Q: What are the key differences between these parts?

A: The MC7924CTG offers lower dropout voltage (1.3V versus 2V) and higher maximum input voltage rating (-40V versus -35V). The MC7924CTG also includes over-current protection in addition to over-temperature protection.

Q: Are there any package or pinout differences?

A: No. Both devices use identical TO-220-3 through-hole packaging with the same pin configuration and mechanical footprint.

Q: What is the operating temperature range for both parts?

A: Both the LM7924CT and MC7924CTG operate across 0°C to 125°C.

Q: Are these parts RoHS compliant?

A: The LM7924CT status is not specified. The MC7924CTG is ROHS3 compliant.

Q: What protection features are included?

A: The LM7924CT includes over-temperature and short-circuit protection. The MC7924CTG includes over-current and over-temperature protection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company