MC7805ECT Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The MC7805ECT 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 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MC7805ECT 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	MC7805ECT Specification
Manufacturer	onsemi
Output Configuration	Positive Fixed
Output Voltage	5V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Typ)	2V @ 1A
Quiescent Current	8 mA
PSRR	73dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MC7805ECT are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Output voltage: 5V fixed
Output current capability: 1A minimum
Input voltage rating: 35V maximum
Package type: TO-220-3 through-hole
Output configuration: Positive fixed
Protection features: Over temperature and short circuit protection

Substitution Categories:

Category 1: Direct Parametric Equivalents (1A Output) Parts meeting all primary criteria with identical 1A output current and full parameter alignment. These include MC7805BTG, MC7805ACTG, MC7805CTG, NCV7805BTG, and L7805ABV/L7805ACV.

Category 2: Reduced Output Current Alternatives (500mA Output) Parts with identical voltage regulation and package but reduced output current to 500mA. These include MC78M05ACTG, MC78M05BTG, and MC78M05CTG. These are suitable only for applications requiring ≤500mA output current.

Category 3: Enhanced Output Current Alternatives (1.5A Output) Parts with identical voltage regulation and package but increased output current capability to 1.5A. These include L7805ABV and L7805ACV from STMicroelectronics, and L7805CV from UMW. These provide higher current capacity than the original specification.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR (120Hz)	Operating Temp	Product Status	RoHS Status
MC7805ECT	onsemi	1A	35V	2V @ 1A	8 mA	73dB	0°C ~ 125°C	Obsolete	Not Specified
MC7805BTG	onsemi	1A	35V	2V @ 1A	8 mA	68dB	-40°C ~ 125°C	Active	ROHS3 Compliant
MC7805ACTG	onsemi	1A	35V	2V @ 1A	6 mA	83dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC7805CTG	onsemi	1A	35V	2V @ 1A	6.5 mA	83dB	0°C ~ 125°C	Active	ROHS3 Compliant
NCV7805BTG	onsemi	1A	35V	2V @ 1A	8 mA	83dB	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
MC78M05ACTG	onsemi	500mA	35V	Not Specified	Not Specified	80dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant
MC78M05BTG	onsemi	500mA	35V	Not Specified	Not Specified	80dB	-40°C ~ 125°C	Active	ROHS3 Compliant
MC78M05CTG	onsemi	500mA	35V	Not Specified	Not Specified	80dB	0°C ~ 125°C	Active	ROHS3 Compliant
L7805ABV	STMicroelectronics	1.5A	35V	2V @ 1A	6 mA	68dB	-40°C ~ 125°C	Active	ROHS3 Compliant
L7805ACV	STMicroelectronics	1.5A	35V	2V @ 1A	6 mA	68dB	0°C ~ 125°C	Active	ROHS3 Compliant
L7805CV	UMW	1.2A	35V	Not Specified	6 mA	Not Specified	-40°C ~ 105°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (1A Output Requirement):

MC7805CTG and MC7805ACTG are the primary recommended substitutes. Both are active products from onsemi with ROHS3 compliance, identical 1A output current, and improved PSRR performance (83dB) compared to the obsolete MC7805ECT (73dB). MC7805CTG offers higher inventory availability (55,100 units) and is suitable for applications with operating temperature range 0°C to 125°C. MC7805ACTG provides lower quiescent current (6 mA) and is available in 6,905 units.

MC7805BTG is an active onsemi product with extended operating temperature range (-40°C to 125°C), suitable for applications requiring wider temperature operation. However, PSRR performance is reduced to 68dB.

For Automotive or Extended Temperature Applications:

NCV7805BTG is an obsolete automotive-grade part (AEC-Q100 qualified) with extended temperature range (-40°C to 125°C) and superior PSRR (83dB). While obsolete, it remains available in high inventory (15,743 units) for legacy system support.

For Higher Current Capacity (1.5A Output):

L7805ACV and L7805ABV from STMicroelectronics provide 1.5A output current in the same TO-220-3 package. L7805ACV operates at 0°C to 125°C, while L7805ABV extends to -40°C to 125°C. Both are active products with ROHS3 compliance and high inventory availability (19,349 and 130,821 units respectively).

For Reduced Current Applications (500mA Output):

MC78M05CTG and MC78M05BTG are active onsemi products rated for 500mA output. MC78M05CTG operates at 0°C to 125°C with 4,878 units in stock. MC78M05BTG extends to -40°C to 125°C with 1,373 units available. These are suitable only for applications with output current requirements ≤500mA.

Frequently Asked Questions (FAQ)

Q: Can MC7805BTG directly replace MC7805ECT?

A: Yes. MC7805BTG is an active onsemi product with identical 1A output current, 5V fixed output, 35V maximum input voltage, and TO-220-3 package. The primary difference is extended operating temperature range (-40°C to 125°C versus 0°C to 125°C) and slightly reduced PSRR (68dB versus 73dB). For applications within 0°C to 125°C, MC7805CTG is preferred due to superior PSRR performance.

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

A: The MC7805 series provides 1A output current, while the MC78M05 series provides 500mA output current. Both share identical 5V output voltage, 35V maximum input voltage, and TO-220-3 package. Selection depends on application current requirements. MC78M05 variants are suitable only for applications requiring ≤500mA output.

Q: Are STMicroelectronics L7805 parts compatible with onsemi MC7805?

A: Yes, with consideration for output current capacity. L7805ACV and L7805ABV provide 1.5A output current compared to MC7805ECT's 1A, making them suitable for higher current applications. Both maintain identical 5V output, 35V maximum input voltage, and TO-220-3 package. Operating temperature ranges differ: L7805ACV operates 0°C to 125°C, while L7805ABV extends to -40°C to 125°C.

Q: Is NCV7805BTG suitable for new designs?

A: NCV7805BTG is classified as obsolete and is not recommended for new designs. However, it remains available in high inventory (15,743 units) for legacy system support and maintenance. For new designs, use active alternatives such as MC7805CTG, MC7805ACTG, or L7805ACV.

Q: What are the package considerations for TO-220-3 regulators?

A: All substitute parts listed maintain the TO-220-3 through-hole package, ensuring mechanical and thermal compatibility with existing PCB layouts and heatsinking arrangements. No package modifications are required for direct substitution.

Q: How do quiescent current differences affect circuit design?

A: Quiescent current (Iq) represents the regulator's internal current consumption. MC7805ECT specifies 8 mA, while MC7805ACTG and MC7805CTG specify 6-6.5 mA. Lower quiescent current reduces standby power consumption. For battery-powered or low-power applications, MC7805ACTG (6 mA) is preferred. For standard applications, the difference is negligible.

Q: Can L7805CV from UMW replace MC7805ECT?

A: L7805CV provides 1.2A output current, exceeding the 1A requirement, and maintains 5V output and 35V maximum input voltage in TO-220-3 package. However, operating temperature range is limited to -40°C to 105°C (versus 0°C to 125°C for MC7805ECT). Use L7805CV only for applications operating within -40°C to 105°C.

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