MC7805ACT Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The MC7805ACT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V 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 new designs or production continuity. The MC7805ACT delivers regulated power management functionality with integrated over-temperature and short-circuit protection, making it suitable for general-purpose power supply applications requiring fixed 5V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current (Iq)	6 mA
PSRR	83dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the MC7805ACT is determined by the following critical parameters: fixed 5V output voltage, output current capacity, maximum input voltage rating of 35V, TO-220-3 package compatibility, and through-hole mounting type. Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes maintain identical electrical specifications and package form factor, differing only in product status or packaging configuration. These parts are pin-compatible and functionally interchangeable without circuit modification.

Parametric Equivalents provide the same 5V fixed output and TO-220-3 package but may vary in output current capacity, quiescent current, or PSRR performance. Selection depends on application current requirements and performance tolerance.

Parameter Comparison

Part Number	Manufacturer	Output Current	Iq (mA)	PSRR (dB)	Operating Temp (°C)	Product Status	RoHS Status
MC7805ACT	onsemi	1A	6	83	0 ~ 125	Obsolete	Non-compliant
MC7805ACTG	onsemi	1A	6	83	0 ~ 125	Active	ROHS3 Compliant
MC7805CTG	onsemi	1A	6.5	83	0 ~ 125	Active	ROHS3 Compliant
L7805ABV	STMicroelectronics	1.5A	6	68	-40 ~ 125	Active	ROHS3 Compliant
L7805ACV	STMicroelectronics	1.5A	6	68	0 ~ 125	Active	ROHS3 Compliant
L7805CV	UMW	1.2A	6	—	-40 ~ 105	Active	ROHS3 Compliant
L78M05ABV	STMicroelectronics	500mA	6	62	-40 ~ 125	Active	ROHS3 Compliant
L78M05CV	STMicroelectronics	500mA	6	62	0 ~ 150	Active	ROHS3 Compliant
L78S05CV	STMicroelectronics	2A	8	54	0 ~ 150	Obsolete	ROHS3 Compliant
LM2931AT-5.0/NOPB	National Semiconductor	100mA	15	80	-40 ~ 85	Active	—
LM2931T-5.0/NOPB	Texas Instruments	100mA	1	55	-40 ~ 85	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MC7805ACTG

The MC7805ACTG is the direct active equivalent of the MC7805ACT. It maintains identical electrical specifications (1A output, 5V fixed, 83dB PSRR) and TO-220-3 package configuration. The primary advantage is active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. This part requires no circuit modification and provides drop-in compatibility.

Secondary Recommendation: MC7805CTG

The MC7805CTG offers equivalent performance with marginally higher quiescent current (6.5mA vs. 6mA). It is actively manufactured by onsemi with ROHS3 compliance and maintains the same 1A output capacity and 5V regulation. This part is suitable for applications where the minor Iq increase is acceptable.

Higher Current Alternative: L7805ABV or L7805ACV

For applications requiring output current exceeding 1A, the L7805ABV (1.5A, -40°C to 125°C) or L7805ACV (1.5A, 0°C to 125°C) from STMicroelectronics provide increased current capacity while maintaining 5V fixed output and TO-220-3 package compatibility. Both parts are ROHS3 compliant and actively produced. The L7805ABV extends the lower operating temperature to -40°C.

Lower Current Alternative: L78M05ABV or L78M05CV

For applications with output current requirements of 500mA or less, the L78M05ABV or L78M05CV provide reduced current rating with identical 5V output and TO-220-3 package. These parts include over-current protection in addition to over-temperature and short-circuit protection. Both are ROHS3 compliant and actively manufactured.

Higher Current Option: L78S05CV

The L78S05CV delivers 2A output capacity at 5V fixed regulation in TO-220-3 package. This part is obsolete but remains available in inventory. It is suitable only when higher current capacity is required and no active alternatives meet specifications.

Low Dropout Alternative: LM2931T-5.0/NOPB

The LM2931T-5.0/NOPB is a low-dropout regulator providing 100mA output at 5V with 0.3V dropout at rated current. This part is suitable for applications with limited input voltage headroom. It is actively manufactured by Texas Instruments with ROHS3 compliance but requires verification of current capacity compatibility.

Frequently Asked Questions (FAQ)

Q: Can MC7805ACTG be used as a direct replacement for MC7805ACT?

A: Yes. The MC7805ACTG is electrically and mechanically identical to the MC7805ACT. Both deliver 1A at 5V fixed output in TO-220-3 package with identical protection features. The primary difference is product status: MC7805ACTG is active and ROHS3 compliant, while MC7805ACT is obsolete.

Q: What is the difference between MC7805CTG and MC7805ACTG?

A: Both parts deliver 1A at 5V fixed output in TO-220-3 package. The MC7805CTG has marginally higher quiescent current (6.5mA vs. 6mA). Both are active and ROHS3 compliant. Selection depends on quiescent current tolerance in the application.

Q: Can L7805ACV replace MC7805ACT?

A: Yes, with consideration of increased output current capacity. The L7805ACV provides 1.5A output at 5V fixed regulation in TO-220-3 package, exceeding the 1A requirement of MC7805ACT. It is pin-compatible and requires no circuit modification. PSRR is lower (68dB vs. 83dB). Operating temperature range is 0°C to 125°C, matching MC7805ACT.

Q: When should L78M05ABV be selected instead of MC7805ACT?

A: The L78M05ABV is appropriate when output current requirements are 500mA or less. It provides identical 5V output and TO-220-3 package with additional over-current protection. It is ROHS3 compliant and actively manufactured.

Q: What is the advantage of LM2931T-5.0/NOPB over MC7805ACT?

A: The LM2931T-5.0/NOPB is a low-dropout regulator with 0.3V dropout at 100mA, compared to 2V dropout for MC7805ACT at 1A. This advantage applies only to applications with limited input voltage headroom and output current requirements of 100mA or less. The LM2931T-5.0/NOPB is not suitable for 1A applications.

Q: Are all substitute parts available in TO-220-3 package?

A: Yes. All substitute parts listed are available in TO-220-3 package with through-hole mounting, ensuring mechanical compatibility with MC7805ACT circuit board layouts.

Q: Which substitute part has the best PSRR performance?

A: The MC7805ACT and MC7805ACTG both provide 83dB PSRR at 120Hz, the highest among all listed substitutes. The MC7805CTG matches this specification. Lower PSRR values (68dB for L7805 series, 62dB for L78M05 series, 54dB for L78S05CV) may require additional filtering in noise-sensitive applications.

Q: Can L78S05CV be used in new designs?

A: The L78S05CV is obsolete and should not be selected for new designs. It is listed for reference only in applications where existing inventory must be utilized. Active alternatives with equivalent or superior specifications are available.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message