MC7824ACT Equivalent & Substitute Parts

Part Overview

The MC7824ACT 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 package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement.

The MC7824ACT operates with a maximum input voltage of 40V, typical dropout voltage of 2V at 1A, and includes over-temperature and short-circuit protection. Current quiescent draw is 6mA with a PSRR of 61dB at 120Hz. The part is RoHS non-compliant and carries unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value
Output Voltage (Fixed)	24V
Output Current	1A
Input Voltage (Max)	40V
Dropout Voltage (Typ)	2V @ 1A
Quiescent Current	6mA
PSRR	61dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Package	TO-220-3
Operating Temperature	0°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MC7824ACT is determined by the following critical parameters:

Fixed output voltage of 24V
TO-220-3 package configuration
Positive output configuration
Through-hole mounting type
Output current capability (minimum 1A required)
Input voltage rating (minimum 40V)
Operating temperature range compatibility
Protection features (over-temperature and short-circuit minimum)

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalent: MC7824ACTG maintains identical electrical specifications and differs only in packaging format (tube vs. bulk) and product status (active vs. obsolete).

Parametric Equivalent: MC7824CTG provides identical core electrical performance with negligible variation in quiescent current (6.5mA vs. 6mA) and active product status with superior RoHS3 compliance.

Similar Alternatives: L7824ABV, L7824ACV, L7824CV, L78M24CV, L78S24CV, UA7824CKCS, and UA7824CKCSE3 maintain the 24V fixed output and TO-220-3 package but vary in output current capacity, quiescent current, PSRR, operating temperature range, and protection feature sets.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR (120Hz)	Operating Temp	Product Status	RoHS Status
MC7824ACT	onsemi	1A	40V	2V @ 1A	6mA	61dB	0°C ~ 125°C	Obsolete	Non-compliant
MC7824ACTG	onsemi	1A	40V	2V @ 1A	6mA	61dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC7824CTG	onsemi	1A	40V	2V @ 1A	6.5mA	61dB	0°C ~ 125°C	Active	ROHS3 Compliant
L7824ABV	STMicroelectronics	1.5A	40V	2V @ 1A	6mA	54dB	-40°C ~ 125°C	Active	ROHS3 Compliant
L7824ACV	STMicroelectronics	1.5A	40V	2V @ 1A	6mA	54dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant
L7824CV	STMicroelectronics	1.5A	40V	2V @ 1A	8mA	50dB	0°C ~ 125°C	Active	ROHS3 Compliant
L78M24CV	STMicroelectronics	500mA	40V	Not specified	6mA	50dB	0°C ~ 125°C	Active	ROHS3 Compliant
L78S24CV	STMicroelectronics	2A	40V	Not specified	8mA	42dB	0°C ~ 150°C	Obsolete	ROHS3 Compliant
UA7824CKCS	Texas Instruments	1.5A	38V	2V @ 1A	Not specified	78dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant
UA7824CKCSE3	Texas Instruments	1.5A	38V	2V @ 1A	Not specified	78dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MC7824ACTG is the direct equivalent replacement. It maintains all electrical specifications of the MC7824ACT while offering active product status and ROHS3 compliance, eliminating obsolescence risk and improving regulatory alignment.

Secondary Recommendation: MC7824CTG provides an alternative from onsemi with active status and ROHS3 compliance. The 0.5mA increase in quiescent current is negligible for most applications and does not affect functional compatibility.

Alternative Selections for Enhanced Specifications:

L7824ABV and L7824CV (STMicroelectronics) offer 1.5A output current capacity, providing design margin above the 1A requirement. Both are active products with ROHS3 compliance. L7824ABV extends operating temperature to -40°C, suitable for industrial applications. L7824CV maintains 0°C lower limit with higher inventory availability (30,800 units).

L78S24CV provides 2A output current for applications requiring additional current headroom, though it is obsolete. L78M24CV is unsuitable due to 500mA output current limitation below the 1A requirement.

UA7824CKCS and UA7824CKCSE3 (Texas Instruments) offer superior PSRR (78dB) and enhanced protection features including reverse polarity protection. Both are obsolete; however, they remain viable if superior noise rejection is required. Input voltage rating is 38V, which is acceptable for most 24V supply applications.

Frequently Asked Questions (FAQ)

Q: Can L78M24CV replace MC7824ACT?

A: No. L78M24CV is rated for 500mA output current, which is insufficient for the 1A requirement of MC7824ACT. This part is not suitable for direct substitution.

Q: What is the difference between MC7824ACTG and MC7824CTG?

A: Both are onsemi products with identical 24V output and 1A current rating. MC7824ACTG is the direct equivalent with 6mA quiescent current. MC7824CTG has 6.5mA quiescent current, a 0.5mA difference that is negligible in most applications. MC7824CTG has significantly higher inventory (175,300 units vs. 2,711 units).

Q: Are STMicroelectronics L7824 variants compatible with MC7824ACT?

A: Yes, with considerations. L7824ABV, L7824ACV, and L7824CV all provide 24V fixed output in TO-220-3 package with 1.5A current capacity, exceeding the 1A requirement. All are ROHS3 compliant. L7824CV is the preferred active alternative with highest inventory. PSRR is lower (50-54dB vs. 61dB), which may affect noise-sensitive applications.

Q: Why do some parts show "Not specified" for dropout voltage?

A: Dropout voltage specifications are not provided in the component data for L78M24CV and L78S24CV. These parameters should be obtained from manufacturer datasheets before final selection if dropout voltage is critical to circuit design.

Q: Can I use UA7824CKCS as a replacement despite obsolete status?

A: UA7824CKCS is functionally compatible with superior PSRR (78dB) and reverse polarity protection. However, it is obsolete. Use only if inventory is available and long-term supply is not required. MC7824ACTG or MC7824CTG are preferred for new designs due to active status.

Q: What is the impact of different operating temperature ranges?

A: MC7824ACT operates 0°C to 125°C. L7824ABV extends to -40°C, suitable for industrial or outdoor applications. L78S24CV extends to 150°C for high-temperature environments. For standard 0°C to 125°C applications, all alternatives are compatible.

Q: Is RoHS compliance important for this substitution?

A: MC7824ACT is RoHS non-compliant. All active alternatives (MC7824ACTG, MC7824CTG, L7824ABV, L7824CV) are ROHS3 compliant, meeting current regulatory requirements for new designs and procurement.

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