LM7824CT Linear Voltage Regulator 24V 1A Equivalent & Substitute Parts

Part Overview

The LM7824CT 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, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LM7824CT 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
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-220-3
Protection Features	Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LM7824CT is determined by the following critical parameters:

Output Voltage: Must be fixed at 24V
Package Type: TO-220-3 or compatible TO-220 footprint
Output Current Capability: Minimum 1A (higher ratings are acceptable)
Input Voltage Rating: Minimum 40V maximum input
Operating Temperature Range: Must support -40°C to 125°C or equivalent industrial range
Protection Features: Over-temperature and short-circuit protection required

Substitute parts are grouped into three categories:

Direct Equivalents (Same Specifications): Parts with identical electrical characteristics and full temperature range support (-40°C to 125°C).

Similar Equivalents (Reduced Temperature Range): Parts meeting all electrical requirements but with reduced operating temperature range (0°C to 125°C). These are suitable for applications not requiring full -40°C operation.

Parametric Equivalents (Higher Current Rating): Parts with 1.5A output capability, providing additional design margin while maintaining 24V fixed output and compatible packaging.

Reduced Current Alternatives (500mA Output): Parts with lower current ratings suitable only for applications requiring less than 500mA output.

Parameter Comparison

Part Number	Manufacturer	Output Current	Quiescent Current (Iq)	Operating Temp Range	Product Status	Package	PSRR (120Hz)
LM7824CT	onsemi	1A	8 mA	-40°C ~ 125°C	Obsolete	TO-220-3	67dB
MC7824BTG	onsemi	1A	8 mA	-40°C ~ 125°C	Active	TO-220-3	61dB
MC7824CTG	onsemi	1A	6.5 mA	0°C ~ 125°C	Active	TO-220-3	61dB
MC7824ACTG	onsemi	1A	6 mA	0°C ~ 125°C	Active	TO-220-3	61dB
L7824CV	STMicroelectronics	1.5A	8 mA	0°C ~ 125°C	Active	TO-220-3	50dB
L7824ABV	STMicroelectronics	1.5A	6 mA	-40°C ~ 125°C	Active	TO-220-3	54dB
L7824ABV-DG	STMicroelectronics	1.5A	6 mA	-40°C ~ 125°C	Active	TO-220-3	54dB
L7824ACV	STMicroelectronics	1.5A	6 mA	0°C ~ 125°C	Obsolete	TO-220-3	54dB
UA7824CKCS	Texas Instruments	1.5A	—	0°C ~ 125°C	Obsolete	TO-220-3	78dB
MC78M24CTG	onsemi	500mA	6.5 mA	0°C ~ 125°C	Obsolete	TO-220-3	70dB
L78M24CV	STMicroelectronics	500mA	6 mA	0°C ~ 125°C	Active	TO-220-3	50dB

Engineering Selection Recommendations

Primary Recommendation for Full Temperature Range (-40°C to 125°C):

MC7824BTG (onsemi) is the direct equivalent replacement. It maintains identical electrical specifications to the LM7824CT, including 1A output current and 8 mA quiescent current, while offering active product status and RoHS3 compliance. This part is the optimal choice for applications requiring the full industrial temperature range.

L7824ABV or L7824ABV-DG (STMicroelectronics) provide alternative sources with 1.5A output capability, offering additional design margin. Both parts are active and RoHS3 compliant with full temperature range support.

Recommendation for Standard Temperature Range (0°C to 125°C):

MC7824CTG (onsemi) is an active alternative with 1A output current and improved quiescent current (6.5 mA). This part offers the highest inventory availability (175,300 units) and is suitable for applications not requiring -40°C operation.

L7824CV (STMicroelectronics) provides 1.5A output capability with active status and RoHS3 compliance, though with reduced PSRR performance (50dB vs. 67dB on the original part).

For Reduced Current Applications (500mA Maximum):

L78M24CV (STMicroelectronics) is the active alternative for applications requiring only 500mA output. This part offers RoHS3 compliance and active product status.

Compliance Considerations:

All recommended active substitutes carry RoHS3 compliance certification. The LM7824CT, MC7824BTG, and L7824ABV/L7824ABV-DG maintain REACH Unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Frequently Asked Questions (FAQ)

Q: Can MC7824CTG replace LM7824CT in applications requiring -40°C operation?

A: No. MC7824CTG operates from 0°C to 125°C only. For full -40°C to 125°C range, use MC7824BTG, L7824ABV, or L7824ABV-DG.

Q: What is the difference between MC7824CTG and MC7824ACTG?

A: Both are onsemi 24V 1A regulators in TO-220-3 packages with 0°C to 125°C operating range. MC7824ACTG has slightly lower quiescent current (6 mA vs. 6.5 mA) and is packaged in Tube format. Both are active products suitable for direct substitution.

Q: Can I use L7824CV (1.5A) instead of LM7824CT (1A)?

A: Yes. L7824CV provides higher current capability (1.5A vs. 1A), making it suitable for the same applications. However, it operates only to 0°C minimum, not -40°C. For full temperature range with higher current, use L7824ABV or L7824ABV-DG.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (MC7824BTG, MC7824CTG, MC7824ACTG, L7824CV, L7824ABV, L7824ABV-DG, L78M24CV) are RoHS3 compliant. Obsolete parts may have varying compliance status.

Q: What is the significance of the TO-220-3 package compatibility?

A: All listed parts use TO-220-3 or compatible TO-220 packaging, ensuring mechanical and thermal compatibility with existing PCB layouts and heatsinking solutions. Pin configuration remains consistent across all substitutes.

Q: Can MC78M24CTG (500mA) be used as a substitute?

A: MC78M24CTG is suitable only for applications requiring maximum 500mA output. It cannot replace LM7824CT in 1A applications. Use only if your design current requirement is confirmed below 500mA.

Q: Which substitute offers the best PSRR performance?

A: UA7824CKCS (Texas Instruments) provides the highest PSRR at 78dB (120Hz). However, this part is obsolete. Among active parts, MC7824BTG and MC7824CTG offer 61dB PSRR, compared to 50dB for STMicroelectronics L78 series.

Q: What inventory availability should I consider?

A: L7824CV offers the highest active inventory (30,800 units), followed by MC7824CTG (175,300 units). MC7824BTG has 3,100 units available. Verify current stock levels with your supplier for production planning.

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