KA7806E Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA7806E is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 6V 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, maintenance, and production continuity. The KA7806E serves applications requiring stable 6V regulation from input sources up to 35V with integrated over-temperature and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	6V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current (Iq)	8 mA
PSRR	75dB (120Hz)
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-220-3
Protection Features	Over Temperature, Short Circuit
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the KA7806E is determined by strict adherence to the following electrical and mechanical parameters:

Output Voltage: Must be fixed at 6V
Output Current: Minimum 1A (higher current ratings are acceptable as they provide design margin)
Input Voltage Range: Maximum 35V or greater
Package / Case: TO-220-3 or compatible TO-220 footprint
Voltage Dropout: 2V @ 1A or lower
Quiescent Current: 8 mA or lower
Protection Features: Over Temperature and Short Circuit protection required
Operating Temperature: Must support -40°C ~ 125°C or a subset thereof

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes: Parts from onsemi with identical electrical specifications and package compatibility
Similar Manufacturer Substitutes: Parts from alternative manufacturers (STMicroelectronics, Fairchild Semiconductor) with equivalent or superior electrical performance
Parametric Equivalents: Parts meeting all critical electrical parameters with minor variations in secondary specifications

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Iq (mA)	PSRR (dB)	Operating Temp (°C)	Package	Product Status
KA7806E	onsemi	6V	1A	35V	2V @ 1A	8	75 (120Hz)	-40 ~ 125	TO-220-3	Obsolete
MC7806BTG	onsemi	6V	1A	35V	2V @ 1A	8	65 (120Hz)	-40 ~ 125	TO-220-3	Obsolete
MC7806ACTG	onsemi	6V	1A	35V	2V @ 1A	6	65 (120Hz)	0 ~ 125	TO-220-3	Obsolete
L7806ABV	STMicroelectronics	6V	1.5A	35V	2V @ 1A	6	65 (120Hz)	-40 ~ 125	TO-220-3	Obsolete
L7806ACV-DG	STMicroelectronics	6V	1.5A	35V	2V @ 1A	6	65 (120Hz)	0 ~ 125	TO-220-3	Obsolete
L7806CV-DG	STMicroelectronics	6V	1.5A	35V	2V @ 1A	8	59 (120Hz)	0 ~ 125	TO-220-3	Obsolete
MC7806CTG	onsemi	6V	1A	35V	2V @ 1A	8	65 (120Hz)	0 ~ 125	TO-220-3	Obsolete
MC78M06CTG	onsemi	6V	500mA	35V	—	—	80 (120Hz)	0 ~ 125	TO-220-3	Obsolete
LM7806CT	Fairchild Semiconductor	6V	1A	35V	2V @ 1A	8	73 (120Hz)	-40 ~ 125	TO-220-3	Obsolete

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility)

MC7806BTG and MC7806CTG from onsemi are direct substitutes for the KA7806E. Both maintain identical output voltage (6V), output current (1A), input voltage rating (35V), and package configuration (TO-220-3). MC7806BTG operates across the full temperature range (-40°C ~ 125°C), matching the KA7806E specification. MC7806CTG operates from 0°C ~ 125°C, which is acceptable for applications not requiring sub-zero operation. Both are RoHS3 compliant.

Cross-Manufacturer Equivalents (Verified Performance)

L7806ABV and L7806ACV-DG from STMicroelectronics provide superior output current capability (1.5A versus 1A), delivering additional design margin while maintaining 6V fixed output and 35V maximum input voltage. L7806ABV supports the full -40°C ~ 125°C temperature range. L7806ACV-DG operates from 0°C ~ 125°C. Both are RoHS3 compliant and suitable for direct pin-compatible replacement.

L7806CV-DG from STMicroelectronics also provides 1.5A output current with identical voltage specifications. Operating temperature is limited to 0°C ~ 125°C. PSRR is 59dB, lower than the KA7806E specification of 75dB, but remains within acceptable performance for most applications.

LM7806CT from Fairchild Semiconductor is a parametric equivalent with identical 1A output current and full -40°C ~ 125°C temperature range. PSRR is 73dB, closely matching the KA7806E at 75dB. RoHS3 compliant.

Not Recommended for Direct Substitution

MC78M06CTG is a 500mA variant and does not meet the 1A output current requirement of the KA7806E. This part is suitable only for applications with reduced current demands.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher output current rating than the KA7806E?

A: Yes. Parts rated for 1.5A output current (L7806ABV, L7806ACV-DG, L7806CV-DG) are fully compatible with applications designed for 1A. The higher current rating provides additional design margin and does not affect circuit operation at 1A load.

Q: What is the difference between TO-220-3 and TO-220 package designations in the data?

A: Both designations refer to the same three-pin through-hole package used for linear voltage regulators. The parts are mechanically and electrically interchangeable in TO-220-3 footprints.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (MC7806BTG, MC7806ACTG, L7806ABV, L7806ACV-DG, L7806CV-DG, MC7806CTG, MC78M06CTG, LM7806CT) are RoHS3 compliant. The original KA7806E is REACH unaffected.

Q: Which substitute should I select for applications requiring -40°C operation?

A: KA7806E, MC7806BTG, L7806ABV, and LM7806CT all support the full -40°C ~ 125°C operating temperature range. MC7806ACTG, L7806ACV-DG, L7806CV-DG, and MC7806CTG are limited to 0°C ~ 125°C and are not suitable for sub-zero applications.

Q: What is PSRR and why does it vary among substitutes?

A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject input voltage ripple. The KA7806E specifies 75dB at 120Hz. Substitutes range from 59dB to 80dB. Higher PSRR values provide superior noise rejection. For noise-sensitive applications, prioritize LM7806CT (73dB) or MC78M06CTG (80dB).

Q: Can MC78M06CTG replace the KA7806E?

A: No. MC78M06CTG is rated for 500mA output current, which is insufficient for applications requiring 1A. Use this part only in designs with reduced current demands.

Q: Are there any compliance or certification differences between substitutes?

A: All substitute parts are REACH unaffected and carry EAR99 ECCN classification, matching the KA7806E. All are RoHS3 compliant. No compliance barriers exist for substitution.

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