MC7808AECT Equivalent & Substitute Parts

Part Overview

The MC7808AECT is a linear voltage regulator IC from onsemi designed to provide a fixed positive 8V output at 1A current capacity in a TO-220-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MC7808AECT delivers regulated 8V output from input voltages up to 35V with integrated over-temperature and short-circuit protection, suitable for applications requiring stable low-voltage power distribution.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	8V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	6 mA
PSRR	62dB (120Hz)
Operating Temperature Range	0°C ~ 125°C
Package / Case	TO-220-3
Protection Features	Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MC7808AECT are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Fixed output voltage of 8V
Output current capability of 1A or greater
Maximum input voltage of 35V or greater
TO-220-3 or compatible TO-220 package
Through-hole mounting type
Over-temperature and short-circuit protection

Substitution Logic: Parts are classified as direct equivalents when all primary criteria are met. Parts with higher output current ratings (1.5A) are considered suitable substitutes as they provide enhanced current capability while maintaining the same voltage regulation and package form factor. Parts with reduced output current (500mA) are listed but represent downrated alternatives suitable only for applications with lower current requirements.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR (120Hz)	Operating Temp	Package	Product Status
MC7808AECT	onsemi	8V	1A	35V	2V @ 1A	6 mA	62dB	0°C ~ 125°C	TO-220-3	Obsolete
MC7808CTG	onsemi	8V	1A	35V	2V @ 1A	8 mA	62dB	0°C ~ 125°C	TO-220-3	Active
L7808ACV-DG	STMicroelectronics	8V	1.5A	35V	2V @ 1A	6 mA	62dB	0°C ~ 125°C	TO-220-3	Active
L7808ABV-DG	STMicroelectronics	8V	1.5A	35V	2V @ 1A	6 mA	62dB	-40°C ~ 125°C	TO-220-3	Obsolete
L7808ACV	STMicroelectronics	8V	1.5A	35V	2V @ 1A	6 mA	62dB	0°C ~ 125°C	TO-220-3	Obsolete
L7808CV	STMicroelectronics	8V	1.5A	35V	2V @ 1A	8 mA	56dB	0°C ~ 125°C	TO-220-3	Obsolete
L7808ABV	STMicroelectronics	8V	1.5A	35V	2V @ 1A	6 mA	62dB	-40°C ~ 125°C	TO-220-3	Obsolete
UA7808CKCS	Texas Instruments	8V	1.5A	25V	2V @ 1A	Not specified	72dB ~ 62dB	0°C ~ 125°C	TO-220-3	Obsolete
MC7808ABTG	onsemi	8V	1A	35V	2V @ 1A	6 mA	62dB	-40°C ~ 125°C	TO-220-3	Obsolete
MC78M08ABTG	onsemi	8V	500mA	35V	Not specified	Not specified	80dB	-40°C ~ 125°C	TO-220-3	Obsolete
MC78M08CTG	onsemi	8V	500mA	35V	Not specified	Not specified	80dB	0°C ~ 125°C	TO-220-3	Obsolete

Engineering Selection Recommendations

Primary Recommendation: MC7808CTG

The MC7808CTG from onsemi is the preferred direct substitute for the MC7808AECT. Both devices share identical electrical specifications (8V output, 1A current, 35V maximum input, 2V dropout voltage, 62dB PSRR), the same TO-220-3 package, and equivalent operating temperature range. The MC7808CTG holds Active product status, ensuring long-term availability and manufacturing support. RoHS3 compliance is confirmed for the MC7808CTG, meeting modern environmental standards.

Secondary Recommendation: L7808ACV-DG

The L7808ACV-DG from STMicroelectronics provides enhanced current capability at 1.5A while maintaining all critical electrical parameters of the MC7808AECT. This part is Active status with confirmed RoHS3 compliance. The L7808ACV-DG is suitable for applications where additional current headroom is beneficial. Operating temperature range matches the MC7808AECT at 0°C to 125°C.

Alternative Consideration: L7808ABV-DG

The L7808ABV-DG offers the same 1.5A output current and electrical performance as the L7808ACV-DG but extends the operating temperature range to -40°C to 125°C. This part is obsolete but remains available in high inventory (23,422 units). Selection of this part is appropriate only when extended low-temperature operation is required and long-term availability is not a concern.

Not Recommended for Direct Substitution:

The MC78M08 series (MC78M08ABTG, MC78M08CTG) and UA7808CKCS are not suitable direct substitutes due to reduced output current (500mA) or lower maximum input voltage (25V for UA7808CKCS), respectively. These parts should be considered only when application requirements explicitly permit reduced current capability or lower input voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can I use the L7808ACV-DG as a direct replacement for the MC7808AECT?

A: Yes. The L7808ACV-DG is a suitable substitute. Both devices provide 8V fixed output, operate from the same 35V maximum input voltage, use the TO-220-3 package, and include identical protection features. The L7808ACV-DG provides higher output current (1.5A vs. 1A), which is compatible with applications designed for 1A operation. The L7808ACV-DG is Active status with RoHS3 compliance.

Q: What is the difference between MC7808CTG and MC7808ABTG?

A: Both are onsemi 8V, 1A regulators in TO-220-3 packages. The MC7808CTG is Active status with 0°C to 125°C operating range. The MC7808ABTG is Obsolete with an extended -40°C to 125°C operating range. Select MC7808CTG for new designs and ongoing production. Select MC7808ABTG only if extended low-temperature operation is required and availability is confirmed.

Q: Why is the UA7808CKCS listed but not recommended?

A: The UA7808CKCS from Texas Instruments has a maximum input voltage of 25V, compared to 35V for the MC7808AECT. This reduced input voltage rating makes it unsuitable for applications designed around the 35V maximum input specification. Use only if your application input voltage does not exceed 25V.

Q: Can I use MC78M08CTG as a substitute?

A: The MC78M08CTG is not a suitable direct substitute. It provides only 500mA output current compared to the 1A requirement of the MC7808AECT. Use MC78M08CTG only in applications where 500mA output current is sufficient and the reduced current rating has been verified against circuit requirements.

Q: Are all substitute parts RoHS compliant?

A: RoHS3 compliance is confirmed for MC7808CTG and L7808ACV-DG (both Active status). Obsolete parts including L7808ABV-DG, L7808ACV, L7808CV, L7808ABV, MC7808ABTG, and MC78M08ABTG are RoHS3 compliant. The UA7808CKCS is RoHS3 compliant. All listed parts meet REACH requirements.

Q: What is the difference between L7808ACV and L7808ACV-DG?

A: Both are STMicroelectronics 8V, 1.5A regulators with identical electrical specifications and TO-220-3 packages. The primary difference is product status: L7808ACV-DG is Active, while L7808ACV is Obsolete. For new designs, select L7808ACV-DG. Both have RoHS3 compliance and identical operating temperature ranges (0°C to 125°C).

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