LM7805ECT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM7805ECT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output with 1.5A maximum output current in a TO-220-3 package. This device is classified as obsolete, which necessitates identification of functionally equivalent active alternatives for new designs and production continuity. The LM7805ECT serves as a positive fixed output regulator suitable for power management applications requiring stable 5V regulation from input sources up to 35V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Maximum Output Current	1.5A
Maximum Input Voltage	35V
Voltage Dropout (Typical)	2V @ 1A
Quiescent Current	8 mA
PSRR	73dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	0°C ~ 125°C
Package Type	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the LM7805ECT is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Package Type: Must be TO-220-3 for mechanical and thermal compatibility
Output Configuration: Must be positive fixed output
Maximum Input Voltage: Must support 35V minimum
Protection Features: Must include Over Temperature and Short Circuit protection
Mounting Type: Must be Through Hole

Substitute parts are grouped into two categories based on output current capability:

Category A - Full Current Equivalents (1A to 1.5A output): Parts meeting or exceeding the 1.5A output current specification of the LM7805ECT, maintaining identical electrical and mechanical characteristics.

Category B - Reduced Current Alternatives (500mA output): Parts with lower output current ratings (500mA) suitable for applications with reduced power requirements, maintaining the same voltage regulation and package form factor.

Parameter Comparison

Part Number	Manufacturer	Output Current	Quiescent Current (mA)	PSRR (120Hz)	Operating Temp Range	Product Status	RoHS Compliance
LM7805ECT	onsemi	1.5A	8	73dB	0°C ~ 125°C	Obsolete	Not Specified
MC7805ACTG	onsemi	1A	6	83dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC7805BTG	onsemi	1A	8	68dB	-40°C ~ 125°C	Active	ROHS3 Compliant
MC7805CTG	onsemi	1A	6.5	83dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC78M05ACTG	onsemi	500mA	N/A	80dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant
MC78M05BTG	onsemi	500mA	N/A	80dB	-40°C ~ 125°C	Active	ROHS3 Compliant
MC78M05CTG	onsemi	500mA	N/A	80dB	0°C ~ 125°C	Active	ROHS3 Compliant
NCV7805BTG	onsemi	1A	8	83dB	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
L7805ABV	STMicroelectronics	1.5A	6	68dB	-40°C ~ 125°C	Active	ROHS3 Compliant
L78M05CV	STMicroelectronics	500mA	6	62dB	0°C ~ 150°C	Active	ROHS3 Compliant
L78S05CV	STMicroelectronics	2A	8	54dB	0°C ~ 150°C	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Full Current Equivalents:

For direct replacement in applications requiring 1.5A output current, L7805ABV (STMicroelectronics) is the preferred substitute. This part maintains identical output current capability, operates across an extended temperature range (-40°C to 125°C), carries active product status, and holds ROHS3 compliance. The lower quiescent current (6mA vs. 8mA) provides improved efficiency.

Secondary Recommendation - onsemi Ecosystem:

If design continuity within the onsemi product family is required, MC7805BTG provides an active alternative with 1A output current, extended temperature range (-40°C to 125°C), and ROHS3 compliance. This part is suitable for applications where output current does not exceed 1A.

Reduced Current Alternative:

For applications with lower power requirements (≤500mA), MC78M05CTG or MC78M05BTG (onsemi) offer active product status with 500mA output current rating. MC78M05BTG extends the operating temperature range to -40°C to 125°C.

Compliance Consideration:

All recommended active substitutes carry ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The LM7805ECT's obsolete status and unspecified RoHS compliance make transition to active, compliant alternatives necessary for new production.

Frequently Asked Questions (FAQ)

Q: Can MC7805BTG directly replace LM7805ECT in all applications?

A: MC7805BTG is mechanically and electrically compatible in TO-220-3 package applications. However, its 1A maximum output current is lower than the LM7805ECT's 1.5A rating. Substitution is valid only if your application's load current does not exceed 1A. For applications requiring the full 1.5A capability, use L7805ABV instead.

Q: What is the difference between MC7805 and MC78M05 series?

A: The MC7805 series supports 1A output current, while the MC78M05 series is rated for 500mA output current. Both maintain the same 5V fixed output voltage and TO-220-3 package. Select based on your application's maximum current requirement.

Q: Why are some substitute parts listed as obsolete?

A: Obsolete parts (MC78M05ACTG, NCV7805BTG, L78S05CV) are included for reference in legacy system documentation and reverse engineering. For new designs, select only active-status parts: MC7805ACTG, MC7805BTG, MC7805CTG, MC78M05BTG, MC78M05CTG, L7805ABV, or L78M05CV.

Q: Is NCV7805BTG suitable for automotive applications?

A: NCV7805BTG carries AEC-Q100 automotive qualification and is rated for -40°C to 125°C operation. However, it is listed as obsolete. For automotive designs requiring equivalent functionality, consult with onsemi for current automotive-grade alternatives.

Q: What is the significance of the temperature range difference between parts?

A: Parts rated -40°C to 125°C (MC7805BTG, L7805ABV, MC78M05BTG) support extended low-temperature operation compared to 0°C to 125°C variants. Select the appropriate range based on your application's environmental requirements. L78M05CV and L78S05CV extend the upper limit to 150°C.

Q: Can I use L78S05CV (2A output) as a substitute for LM7805ECT?

A: L78S05CV is mechanically compatible and provides higher output current (2A). However, it is listed as obsolete. While it functions as a substitute, active alternatives (L7805ABV at 1.5A or MC7805BTG at 1A) are preferred for new designs due to current product status and compliance certifications.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed carry ROHS3 compliance. The LM7805ECT's compliance status is not specified. Transition to ROHS3-compliant alternatives ensures regulatory compliance for modern applications and supply chain continuity.

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