LM7824ACT Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM7824ACT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 24V output at 1A current capacity in a TO-220-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LM7824ACT serves applications requiring stable 24V regulation from input sources up to 40V, with integrated over-temperature and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	24V
Output Current	1A
Input Voltage (Max)	40V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	8 mA
PSRR	67dB (120Hz)
Operating Temperature Range	0°C ~ 125°C
Package / Case	TO-220-3
Protection Features	Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LM7824ACT is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 24V
Output current capability of 1A or greater
Maximum input voltage of 40V or greater
TO-220-3 through-hole package configuration
Over-temperature and short-circuit protection

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents maintain identical electrical specifications and are direct replacements with no design modifications required. These parts share the same output current (1A), voltage dropout characteristics, and operating temperature range as the LM7824ACT.

Similar Parts provide the same 24V fixed output and 1A current capacity but may differ in secondary parameters such as quiescent current, PSRR, or product status. These parts are suitable for applications where the LM7824ACT specifications are met or exceeded.

Current-Reduced Alternatives deliver the same 24V output but with reduced current capacity (500mA). These parts are suitable only for applications where the load current does not exceed 500mA.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Quiescent Current	PSRR (120Hz)	Operating Temperature	Product Status	RoHS Status
LM7824ACT	onsemi	24V	1A	40V	2V @ 1A (Typ)	8 mA	67dB	0°C ~ 125°C	Obsolete	REACH Unaffected
MC7824CTG	onsemi	24V	1A	40V	2V @ 1A (Typ)	6.5 mA	61dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC7824ACTG	onsemi	24V	1A	40V	2V @ 1A (Typ)	6 mA	61dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC7824BTG	onsemi	24V	1A	40V	2V @ 1A (Typ)	8 mA	61dB	-40°C ~ 125°C	Active	ROHS3 Compliant
L7824CV	STMicroelectronics	24V	1.5A	40V	2V @ 1A (Typ)	8 mA	50dB	0°C ~ 125°C	Active	ROHS3 Compliant
L7824CV-DG	STMicroelectronics	24V	1.5A	40V	2V @ 1A (Typ)	8 mA	50dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC78M24CTG	onsemi	24V	500mA	40V	Not Specified	Not Specified	70dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant
L78M24CV	STMicroelectronics	24V	500mA	40V	Not Specified	6 mA	50dB	0°C ~ 125°C	Active	ROHS3 Compliant
L78S24CV	STMicroelectronics	24V	2A	40V	Not Specified	8 mA	42dB	0°C ~ 150°C	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MC7824CTG or MC7824ACTG

Both MC7824CTG and MC7824ACTG are active onsemi products that provide parametric equivalence to the LM7824ACT. These parts maintain the same 24V output, 1A current capacity, 40V maximum input voltage, and 2V typical dropout voltage. Both are ROHS3 compliant and suitable for direct replacement in existing designs. MC7824CTG offers the highest inventory availability (175,300 units) and is the preferred choice for production continuity.

Secondary Recommendation: MC7824BTG

MC7824BTG is an active onsemi product with extended operating temperature range (-40°C ~ 125°C) compared to the LM7824ACT (0°C ~ 125°C). This part is suitable for applications requiring operation below 0°C. All other electrical parameters match the LM7824ACT specification.

Alternative Recommendation: L7824CV or L7824CV-DG

L7824CV and L7824CV-DG are active STMicroelectronics products offering higher output current capacity (1.5A) while maintaining the same 24V output and 40V maximum input voltage. These parts are suitable for applications where increased current headroom is beneficial. Both variants are ROHS3 compliant and widely available.

Current-Limited Alternative: L78M24CV

L78M24CV is an active STMicroelectronics product with reduced output current (500mA). This part is suitable only for applications where the load current does not exceed 500mA. The lower quiescent current (6 mA) may provide efficiency benefits in low-power applications.

Frequently Asked Questions (FAQ)

Q: Can MC7824CTG directly replace LM7824ACT without circuit modifications?

A: Yes. MC7824CTG maintains identical electrical specifications for output voltage (24V), output current (1A), input voltage rating (40V), and voltage dropout (2V @ 1A typical). The TO-220-3 package pinout is identical. No circuit modifications are required.

Q: What is the difference between MC7824CTG and MC7824ACTG?

A: Both parts are parametric equivalents with identical output specifications. The primary difference is quiescent current: MC7824ACTG draws 6 mA while MC7824CTG draws 6.5 mA. Both are active products suitable for direct replacement.

Q: Why would I choose L7824CV over MC7824CTG?

A: L7824CV provides higher output current capacity (1.5A versus 1A), offering additional design margin for applications with variable or growing load requirements. Both parts maintain the same 24V output and 40V input rating. Selection depends on application current requirements and preferred manufacturer.

Q: Can L78M24CV be used as a substitute for LM7824ACT?

A: L78M24CV is suitable only if your application load current does not exceed 500mA. The LM7824ACT is rated for 1A output, so L78M24CV represents a current-limited alternative. Verify your actual load current before selecting this part.

Q: What is the significance of the extended temperature range in MC7824BTG?

A: MC7824BTG operates from -40°C to 125°C, compared to LM7824ACT's 0°C to 125°C range. Select MC7824BTG only if your application requires operation below 0°C. For standard 0°C to 125°C applications, MC7824CTG is the preferred choice.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (MC7824CTG, MC7824ACTG, MC7824BTG, L7824CV, L7824CV-DG, L78M24CV) are ROHS3 compliant. The LM7824ACT is obsolete and marked as REACH Unaffected. Verify compliance requirements for your specific application and region.

Q: What is the inventory status for these substitute parts?

A: MC7824CTG has the highest availability (175,300 units). L7824CV-DG (125,100 units) and L7824CV (30,800 units) are also well-stocked. All listed parts are available as new original stock from authorized distributors.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message