MC7808ACTG Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The MC7808ACTG is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 8V output at 1A current capacity in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MC7808ACTG delivers regulated power management suitable for applications requiring stable 8V rails with thermal and short-circuit protection.

Key Parameters

Parameter	MC7808ACTG
Manufacturer	onsemi
Output Voltage (Fixed)	8V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	6 mA
PSRR	62dB (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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MC7808ACTG are classified based on strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Fixed positive 8V output voltage
TO-220-3 package / Through Hole mounting
Output current capacity of 1A or greater
Input voltage rating of 25V or greater
Over Temperature and Short Circuit protection
ROHS3 compliance

Parametric Equivalent: MC7808CTG (onsemi) maintains identical electrical specifications with active product status and tube packaging.

Similar Substitutes: L7808ABV, L7808ACV, L7808CV (STMicroelectronics), and UA7808CKCS, UA7808CKCSE3 (Texas Instruments) meet core electrical requirements with output current ratings of 1.5A, providing enhanced current capacity while maintaining 8V fixed output and TO-220-3 package compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Quiescent Current	PSRR	Package	Product Status	Operating Temp
MC7808ACTG	onsemi	8V	1A	35V	2V @ 1A (Typ)	6 mA	62dB (120Hz)	TO-220-3	Obsolete	0°C ~ 125°C
MC7808CTG	onsemi	8V	1A	35V	2V @ 1A (Typ)	8 mA	62dB (120Hz)	TO-220-3	Active	0°C ~ 125°C
L7808ABV	STMicroelectronics	8V	1.5A	35V	2V @ 1A (Typ)	6 mA	62dB (120Hz)	TO-220-3	Obsolete	-40°C ~ 125°C
L7808ACV	STMicroelectronics	8V	1.5A	35V	2V @ 1A (Typ)	6 mA	62dB (120Hz)	TO-220-3	Obsolete	0°C ~ 125°C
L7808CV	STMicroelectronics	8V	1.5A	35V	2V @ 1A (Typ)	8 mA	56dB (120Hz)	TO-220-3	Obsolete	0°C ~ 125°C
UA7808CKCS	Texas Instruments	8V	1.5A	25V	2V @ 1A	Not Specified	72dB ~ 62dB (120Hz)	TO-220-3	Obsolete	0°C ~ 125°C
UA7808CKCSE3	Texas Instruments	8V	1.5A	25V	2V @ 1A	Not Specified	72dB ~ 62dB (120Hz)	TO-220-3	Obsolete	0°C ~ 125°C

Engineering Selection Recommendations

For Direct Replacement (Active Product Status): MC7808CTG is the recommended direct substitute, manufactured by onsemi with identical electrical specifications and active product status. This part maintains the same 1A output current, 35V maximum input voltage, and TO-220-3 package configuration as the MC7808ACTG.

For Enhanced Current Capacity: L7808ABV, L7808ACV, and L7808CV (STMicroelectronics) provide 1.5A output current while maintaining 8V fixed output and TO-220-3 package compatibility. These parts are suitable for applications requiring higher current headroom. Note that L7808ABV extends operating temperature to -40°C, providing wider temperature range coverage.

For Alternative Sourcing: UA7808CKCS and UA7808CKCSE3 (Texas Instruments) deliver 1.5A output current with 8V fixed output in TO-220-3 packages. These parts feature maximum input voltage of 25V and include reverse polarity protection. Both are ROHS3 compliant.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original MC7808ACTG specifications.

Frequently Asked Questions (FAQ)

Q: Can MC7808CTG directly replace MC7808ACTG? A: Yes. MC7808CTG is a parametric equivalent with identical electrical specifications (8V output, 1A current, 35V maximum input, TO-220-3 package) and active product status from onsemi.

Q: What is the difference between 1A and 1.5A output current ratings? A: The MC7808ACTG is rated for 1A maximum output current. Substitute parts rated for 1.5A (L7808ABV, L7808ACV, L7808CV, UA7808CKCS, UA7808CKCSE3) provide higher current capacity and are suitable for applications requiring additional current margin. These parts are backward compatible with 1A designs.

Q: Are all substitute parts in TO-220-3 packages? A: Yes. All listed substitute parts use TO-220-3 packages with through-hole mounting, maintaining mechanical compatibility with MC7808ACTG PCB layouts.

Q: What is the significance of the 25V vs. 35V maximum input voltage rating? A: MC7808ACTG and most STMicroelectronics substitutes are rated for 35V maximum input. Texas Instruments parts (UA7808CKCS, UA7808CKCSE3) are rated for 25V maximum input. Applications operating above 25V input require parts with 35V ratings.

Q: Do all substitute parts include thermal and short-circuit protection? A: Yes. All listed substitute parts include over-temperature and short-circuit protection. Texas Instruments parts additionally include reverse polarity protection.

Q: What is PSRR and why does it vary among substitutes? A: Power Supply Rejection Ratio (PSRR) measures the regulator's ability to reject input voltage ripple. MC7808ACTG specifies 62dB at 120Hz. L7808CV specifies 56dB, while UA7808CKCS/UA7808CKCSE3 specify 72dB ~ 62dB. Higher PSRR values indicate better ripple rejection performance.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental compliance requirements equivalent to the MC7808ACTG.

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