MC7805ECTBU Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The MC7805ECTBU 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 MC7805ECTBU belongs to the Power Management (PMIC) category and is suitable for applications requiring stable 5V regulation from input sources up to 35V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current (Iq)	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

Substitute Part Grouping Explanation

Substitution for the MC7805ECTBU is determined by the following critical parameters:

Fixed output voltage of 5V
Output current capability of 1A or greater
Input voltage tolerance up to 35V
TO-220-3 package configuration for through-hole mounting
Positive output configuration with fixed regulation type
Over temperature and short circuit protection

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

Category 1: 1A Output Current (Direct Substitutes) Parts with 1A output current matching the original specification: MC7805ACTG, MC7805BTG, MC7805CTG, NCV7805BTG, and L7805ABV.

Category 2: Higher Output Current (Enhanced Substitutes) Parts with 1.5A or greater output current, suitable for applications requiring additional current headroom: L7805ACV and L7805CV.

Category 3: Reduced Output Current (Lower-Capacity Alternatives) Parts with 500mA output current for applications with lower current requirements: MC78M05ACTG, MC78M05BTG, and MC78M05CTG.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Iq (mA)	PSRR (dB)	Operating Temp	Product Status	Package
MC7805ECTBU	onsemi	5V	1A	35V	2V @ 1A	8	73	0°C ~ 125°C	Obsolete	TO-220-3
MC7805ACTG	onsemi	5V	1A	35V	2V @ 1A	6	83	0°C ~ 125°C	Active	TO-220-3
MC7805BTG	onsemi	5V	1A	35V	2V @ 1A	8	68	-40°C ~ 125°C	Active	TO-220-3
MC7805CTG	onsemi	5V	1A	35V	2V @ 1A	6.5	83	0°C ~ 125°C	Active	TO-220-3
MC78M05ACTG	onsemi	5V	500mA	35V	—	—	80	0°C ~ 125°C	Obsolete	TO-220-3
MC78M05BTG	onsemi	5V	500mA	35V	—	—	80	-40°C ~ 125°C	Active	TO-220-3
MC78M05CTG	onsemi	5V	500mA	35V	—	—	80	0°C ~ 125°C	Active	TO-220-3
NCV7805BTG	onsemi	5V	1A	35V	2V @ 1A	8	83	-40°C ~ 125°C	Obsolete	TO-220-3
L7805ABV	STMicroelectronics	5V	1.5A	35V	2V @ 1A	6	68	-40°C ~ 125°C	Active	TO-220-3
L7805ACV	STMicroelectronics	5V	1.5A	35V	2V @ 1A	6	68	0°C ~ 125°C	Active	TO-220-3
L7805CV	UMW	5V	1.2A	35V	—	6	—	-40°C ~ 105°C	Active	TO-220-3

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement: MC7805BTG (onsemi) is the preferred direct substitute. It maintains identical electrical specifications to the MC7805ECTBU with 1A output current and 35V maximum input voltage. The part is in active production status with extended operating temperature range (-40°C ~ 125°C), providing improved reliability for temperature-sensitive applications. RoHS3 compliance and high inventory availability (175,400 units) ensure supply chain continuity.

Alternative Direct Substitutes: MC7805ACTG and MC7805CTG are active onsemi alternatives with identical output specifications. Both feature improved PSRR performance (83dB vs. 73dB) and lower quiescent current, making them suitable for noise-sensitive or battery-powered applications.

Higher Current Capacity Option: L7805ACV (STMicroelectronics) provides 1.5A output current in the same TO-220-3 package. This part is recommended for applications requiring additional current margin or future design scaling. Active production status and RoHS3 compliance support long-term availability.

Extended Temperature Range: MC7805BTG and L7805ABV both support -40°C ~ 125°C operating range, suitable for industrial and automotive environments requiring wider temperature tolerance than the original 0°C ~ 125°C specification.

Reduced Current Applications: MC78M05BTG and MC78M05CTG provide 500mA output current for lower-power applications, reducing thermal dissipation requirements while maintaining 5V fixed regulation and TO-220-3 packaging.

Frequently Asked Questions (FAQ)

Q: Can MC7805BTG directly replace MC7805ECTBU without circuit modifications? A: Yes. MC7805BTG maintains identical electrical specifications for output voltage (5V), output current (1A), input voltage tolerance (35V max), dropout voltage (2V @ 1A), and protection features (over temperature, short circuit). The TO-220-3 package pinout is identical, requiring no PCB layout changes.

Q: What is the difference between MC7805ACTG, MC7805BTG, and MC7805CTG? A: All three are onsemi 1A 5V regulators in TO-220-3 packages with identical core specifications. Differences include quiescent current (MC7805ACTG and MC7805CTG: 6-6.5mA vs. MC7805BTG: 8mA) and PSRR performance (MC7805ACTG and MC7805CTG: 83dB vs. MC7805BTG: 68dB). Operating temperature ranges vary: MC7805ACTG and MC7805CTG support 0°C ~ 125°C, while MC7805BTG extends to -40°C ~ 125°C.

Q: Why would I choose L7805ACV over MC7805BTG? A: L7805ACV (STMicroelectronics) provides 1.5A output current versus 1A for MC7805BTG, offering 50% additional current capacity in the same package. This is beneficial for applications with growing power demands or designs requiring thermal margin. Both parts are in active production with RoHS3 compliance.

Q: Are the MC78M05 series parts suitable replacements? A: MC78M05 series parts (500mA output) are suitable only for applications with maximum current requirements of 500mA or less. They are not direct replacements for 1A applications but are appropriate for lower-power designs requiring 5V regulation in the same TO-220-3 package.

Q: What is the significance of the NCV7805BTG automotive qualification? A: NCV7805BTG carries AEC-Q100 automotive qualification and extended temperature range (-40°C ~ 125°C), making it suitable for automotive and industrial applications. However, it is currently obsolete. MC7805BTG provides equivalent performance with active production status.

Q: Does package type affect substitution compatibility? A: All listed substitute parts use TO-220-3 through-hole packaging, maintaining identical pinout and PCB footprint compatibility with MC7805ECTBU. No package conversion is required for any listed substitutes.

Q: What compliance certifications apply to these parts? A: Active production parts (MC7805ACTG, MC7805BTG, MC7805CTG, L7805ABV, L7805ACV, L7805CV) are RoHS3 compliant. All parts listed are REACH unaffected and classified as EAR99 for export control purposes.

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