KA7805ETSTU Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA7805ETSTU 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 package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The KA7805ETSTU serves as a positive fixed output regulator suitable for power management 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	-40°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the KA7805ETSTU are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Output voltage: 5V fixed
Output current capacity: 1A or greater
Input voltage rating: 35V maximum
Package type: TO-220-3
Protection features: Over temperature and short circuit protection
Mounting type: Through hole

Parametric Equivalent: MC7805BTG matches all electrical specifications and operating temperature range (-40°C ~ 125°C) with active product status and RoHS3 compliance.

Similar Substitutes: MC7805ACTG, MC7805CTG, NCV7805BTG, L7805ABV, and L7805ACV provide equivalent 5V/1A regulation with compatible TO-220-3 packaging. These parts maintain the same input voltage rating and protection features, with minor variations in quiescent current and PSRR performance within acceptable engineering tolerances.

Current-Reduced Alternatives: MC78M05ACTG, MC78M05BTG, and MC78M05CTG provide 500mA output current, suitable only for applications requiring reduced current capacity.

Higher Current Capability: L7805ABV and L7805ACV offer 1.5A output current, providing additional headroom for applications with higher current demands while maintaining 5V fixed output and TO-220-3 packaging.

Parameter Comparison

Part Number	Manufacturer	Output Current	Iq (mA)	PSRR (dB)	Operating Temp	Product Status	RoHS Status
KA7805ETSTU	onsemi	1A	8	73	-40°C ~ 125°C	Obsolete	Not Specified
MC7805BTG	onsemi	1A	8	68	-40°C ~ 125°C	Active	ROHS3 Compliant
MC7805ACTG	onsemi	1A	6	83	0°C ~ 125°C	Active	ROHS3 Compliant
MC7805CTG	onsemi	1A	6.5	83	0°C ~ 125°C	Active	ROHS3 Compliant
NCV7805BTG	onsemi	1A	8	83	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
L7805ABV	STMicroelectronics	1.5A	6	68	-40°C ~ 125°C	Active	ROHS3 Compliant
L7805ACV	STMicroelectronics	1.5A	6	68	0°C ~ 125°C	Active	ROHS3 Compliant
L7805CV	UMW	1.2A	6	Not Specified	-40°C ~ 105°C	Active	ROHS3 Compliant
MC78M05BTG	onsemi	500mA	Not Specified	80	-40°C ~ 125°C	Active	ROHS3 Compliant
MC78M05CTG	onsemi	500mA	Not Specified	80	0°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

First Choice for Direct Replacement: MC7805BTG is the primary parametric equivalent, offering identical electrical specifications, matching operating temperature range (-40°C ~ 125°C), and active product status with RoHS3 compliance. This part provides the most direct substitution path with 175,400 units in stock.

Alternative for Extended Temperature Range: L7805ABV maintains the full -40°C ~ 125°C operating range with higher output current capacity (1.5A) and active status. This option is suitable for applications requiring additional current headroom while preserving temperature performance.

For Standard Industrial Temperature Range: MC7805ACTG and MC7805CTG are active alternatives with improved PSRR performance (83dB vs 73dB) and reduced quiescent current. These parts operate from 0°C ~ 125°C, suitable for non-extended temperature applications.

Automotive-Grade Option: NCV7805BTG provides AEC-Q100 qualification and automotive-grade certification with matching electrical specifications, though it carries obsolete status. This part is appropriate only for automotive applications where qualification is mandatory.

For Reduced Current Applications: MC78M05BTG and MC78M05CTG provide 500mA output current with active status and RoHS3 compliance. These parts are suitable only for applications with current requirements below 1A.

All recommended substitutes maintain TO-220-3 packaging, 5V fixed output, 35V maximum input voltage, and integrated over-temperature and short-circuit protection.

Frequently Asked Questions (FAQ)

Q: Can MC7805BTG directly replace KA7805ETSTU without circuit modifications?

A: Yes. MC7805BTG is a parametric equivalent with identical output voltage (5V), output current (1A), input voltage rating (35V), dropout voltage (2V @ 1A typical), and operating temperature range (-40°C ~ 125°C). The TO-220-3 package pinout is identical, requiring no circuit changes.

Q: What is the difference between MC7805ACTG and MC7805CTG?

A: Both are active onsemi alternatives with identical electrical function. MC7805ACTG has quiescent current of 6 mA, while MC7805CTG is 6.5 mA. Both operate from 0°C ~ 125°C and provide 83dB PSRR. Selection depends on application temperature requirements and quiescent current sensitivity.

Q: Why are L7805ABV and L7805ACV listed as substitutes if they provide 1.5A instead of 1A?

A: Higher output current capacity is a valid substitution parameter. These STMicroelectronics parts maintain 5V fixed output, 35V input rating, and TO-220-3 packaging. The 1.5A rating provides additional design margin without affecting circuit compatibility. L7805ABV covers -40°C ~ 125°C; L7805ACV covers 0°C ~ 125°C.

Q: Can MC78M05BTG replace KA7805ETSTU?

A: No. MC78M05BTG provides only 500mA output current versus the required 1A. This part is suitable only for applications with reduced current requirements. Use only if your circuit draws less than 500mA.

Q: What is the significance of RoHS3 compliance in these substitutes?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. All active substitute parts listed carry RoHS3 compliance, ensuring regulatory alignment for new designs. The original KA7805ETSTU does not specify RoHS status due to its obsolete classification.

Q: Is NCV7805BTG suitable for non-automotive applications?

A: NCV7805BTG carries automotive-grade qualification (AEC-Q100) and is designed for automotive environments. While electrically equivalent, it is optimized for automotive specifications. For general industrial applications, use MC7805BTG or L7805ABV instead.

Q: How does operating temperature range affect part selection?

A: The KA7805ETSTU operates -40°C ~ 125°C. MC7805BTG and L7805ABV maintain this full range. MC7805ACTG, MC7805CTG, L7805ACV, and MC78M05CTG operate 0°C ~ 125°C, suitable for standard industrial applications. L7805CV operates -40°C ~ 105°C, with reduced upper temperature limit. Select based on your application's minimum operating temperature requirement.

Q: Are there inventory considerations for these substitutes?

A: MC7805BTG has the highest inventory (175,400 units), ensuring immediate availability. L7805ABV (130,821 units) and L7805CV (125,400 units) also have substantial stock. MC78M05BTG and MC78M05CTG have lower inventory (1,373 and 4,878 units respectively). Verify current availability with your supplier for production planning.

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