LM7808CT Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LM7808CT 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 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LM7808CT serves applications requiring stable 8V regulation from input sources up to 35V with integrated over-temperature and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	8V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	8 mA
PSRR	73dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the LM7808CT is determined by strict equivalence across the following critical parameters: fixed 8V output voltage, positive output configuration, TO-220-3 package compatibility, through-hole mounting, and protection features (over-temperature and short-circuit). Current output capacity is the primary differentiator among available substitutes.

Substitute parts are grouped into two categories:

Category 1: Direct Current Equivalents (1A Output) Parts with 1A output current matching the LM7808CT specification: MC7808CTG, MC7808ABTG, and NCV7808BTG. These provide identical current handling and are interchangeable in applications requiring 1A output.

Category 2: Higher Current Capacity (1.5A Output) Parts with 1.5A output current: L7808ABV, L7808ABV-DG, L7808ACV, L7808ACV-DG, and L7808CV. These provide enhanced current capability and are suitable for applications where the LM7808CT's 1A limit is insufficient, provided circuit design accommodates the higher current rating.

Category 3: Reduced Current Capacity (500mA Output) Parts with 500mA output current: MC78M08ABTG and MC78M08CTG. These are suitable only for applications with reduced current requirements below 1A.

All substitute parts maintain the 8V fixed output, 35V maximum input voltage, TO-220-3 package, and integrated protection features.

Parameter Comparison

Part Number	Manufacturer	Output Current	Quiescent Current (mA)	PSRR (dB @ 120Hz)	Operating Temp Range	Product Status	RoHS Status
LM7808CT	onsemi	1A	8	73	-40°C ~ 125°C	Obsolete	Not Specified
MC7808CTG	onsemi	1A	8	62	0°C ~ 125°C	Active	ROHS3 Compliant
MC7808ABTG	onsemi	1A	6	62	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
NCV7808BTG	onsemi	1A	8	62	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
L7808ABV	STMicroelectronics	1.5A	6	62	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
L7808ABV-DG	STMicroelectronics	1.5A	6	62	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
L7808ACV	STMicroelectronics	1.5A	6	62	0°C ~ 125°C	Obsolete	ROHS3 Compliant
L7808ACV-DG	STMicroelectronics	1.5A	6	62	0°C ~ 125°C	Active	ROHS3 Compliant
L7808CV	STMicroelectronics	1.5A	8	56	0°C ~ 125°C	Obsolete	ROHS3 Compliant
MC78M08ABTG	onsemi	500mA	N/A	80	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
MC78M08CTG	onsemi	500mA	N/A	80dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For Active Product Status Priority: L7808ACV-DG (STMicroelectronics) is the only active substitute part with 1.5A output capacity and ROHS3 compliance. This part is recommended for new designs requiring long-term supply continuity and regulatory compliance. Operating temperature range is 0°C ~ 125°C, which covers standard industrial applications.

For Extended Temperature Range (-40°C ~ 125°C): MC7808ABTG, L7808ABV, L7808ABV-DG, and NCV7808BTG maintain the full -40°C ~ 125°C operating range of the LM7808CT. These parts are suitable for applications requiring extended low-temperature operation. All are ROHS3 compliant.

For Automotive Applications: NCV7808BTG is qualified to AEC-Q100 automotive standards and maintains the full -40°C ~ 125°C temperature range. This part is appropriate for automotive-grade applications requiring regulatory qualification.

For Direct 1A Current Replacement: MC7808CTG (onsemi, active status) provides identical 1A output current with ROHS3 compliance. Operating temperature range is 0°C ~ 125°C. This is the preferred active substitute for direct current equivalence.

For Higher Current Capacity Applications: L7808ABV-DG, L7808ACV-DG, or L7808CV provide 1.5A output capacity. These parts are suitable when application requirements exceed the 1A specification of the LM7808CT. L7808ACV-DG is active status; others are obsolete.

All substitute parts maintain 8V fixed output, 35V maximum input voltage, TO-220-3 package, and integrated protection features.

Frequently Asked Questions (FAQ)

Q: Can I use a 1.5A substitute part in place of the LM7808CT? A: Yes. Parts with 1.5A output (L7808ABV, L7808ABV-DG, L7808ACV, L7808ACV-DG, L7808CV) are electrically compatible. The higher current rating does not affect operation in circuits designed for 1A. Verify that your circuit board layout and thermal management accommodate the substitute part's specifications.

Q: What is the difference between MC7808CTG and MC7808ABTG? A: Both provide 1A output and 8V regulation. MC7808CTG is active status with 0°C ~ 125°C operating range. MC7808ABTG is obsolete with -40°C ~ 125°C operating range. Select MC7808CTG for new designs; MC7808ABTG for applications requiring extended low-temperature operation.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts are ROHS3 compliant. The original LM7808CT does not specify RoHS status.

Q: Can I use MC78M08CTG or MC78M08ABTG as substitutes? A: These parts provide only 500mA output current, compared to the LM7808CT's 1A. Use only if your application current requirement is 500mA or less. They are not suitable for applications requiring the full 1A capacity.

Q: What is the difference between L7808ACV-DG and L7808ABV-DG? A: Both provide 1.5A output and 8V regulation with identical electrical specifications. L7808ACV-DG is active status; L7808ABV-DG is obsolete. Operating temperature ranges differ: L7808ACV-DG is 0°C ~ 125°C; L7808ABV-DG is -40°C ~ 125°C. Select L7808ACV-DG for new designs.

Q: Is NCV7808BTG suitable for automotive applications? A: Yes. NCV7808BTG is qualified to AEC-Q100 automotive standards and maintains -40°C ~ 125°C operating range with 1A output. This part is appropriate for automotive-grade designs.

Q: What does PSRR value indicate for these regulators? A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject input voltage ripple. Higher PSRR values indicate better noise rejection. The LM7808CT specifies 73dB; most substitutes range from 56dB to 80dB. Select based on your application's noise sensitivity requirements.

Q: Can I interchange parts with different quiescent current specifications? A: Yes. Quiescent current differences (6mA vs 8mA) are minor and do not affect functional compatibility. Select based on your application's standby power consumption requirements.

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