KA7805ERTM Equivalent & Substitute Parts

Part Overview

The KA7805ERTM is a linear voltage regulator IC from onsemi, rated for positive fixed 5V output at 1A maximum current in a DPAK surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The KA7805ERTM operates across an input voltage range up to 35V with integrated over-temperature and short-circuit protection, suitable for general-purpose power management applications requiring stable 5V regulation.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Output Voltage (Fixed)	5V
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	-40°C ~ 125°C
Package	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the KA7805ERTM is determined by the following critical parameters:

Output voltage fixed at 5V
Output current capability of 1A or greater
Maximum input voltage of 35V or greater
DPAK surface mount package (TO-252-3)
Over-temperature and short-circuit protection
Operating temperature range compatibility

Substitute parts are grouped into two categories:

Direct Substitutes (1A Output Current): Parts with identical 1A output current rating, matching the KA7805ERTM specification. These include MC7805BDTG, MC7805BDTRKG, MC7805CDTG, and MC7805CDTRKG from onsemi. All maintain the same electrical performance envelope and package footprint.

Functional Alternatives (500mA Output Current): Parts with reduced output current capability (500mA) including MC78M05ABDTG, MC78M05ABDTRKG, MC78M05ACDTRKG, MC78M05BDTG, MC78M05BDTRKG, and MC78M05CDTG. These are suitable only for applications where the maximum required output current does not exceed 500mA.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Current	Quiescent Current (mA)	PSRR (120Hz)	Operating Temp	Packaging	RoHS Status
KA7805ERTM	onsemi	Obsolete	1A	8	73dB	-40°C ~ 125°C	Tube	Not Specified
MC7805BDTG	onsemi	Active	1A	8	68dB	-40°C ~ 125°C	Tube	ROHS3 Compliant
MC7805BDTRKG	onsemi	Active	1A	8	68dB	-40°C ~ 125°C	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
MC7805CDTG	onsemi	Active	1A	6.5	83dB	0°C ~ 125°C	Tube	ROHS3 Compliant
MC7805CDTRKG	onsemi	Active	1A	6.5	83dB	0°C ~ 125°C	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
MC78M05ABDTG	onsemi	Active	500mA	Not Specified	80dB	-40°C ~ 125°C	Tube	ROHS3 Compliant
MC78M05ABDTRKG	onsemi	Active	500mA	Not Specified	80dB	-40°C ~ 125°C	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
MC78M05ACDTRKG	onsemi	Active	500mA	Not Specified	80dB	0°C ~ 125°C	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
MC78M05BDTG	onsemi	Active	500mA	Not Specified	80dB	-40°C ~ 125°C	Tube	ROHS3 Compliant
MC78M05BDTRKG	onsemi	Active	500mA	Not Specified	80dB	-40°C ~ 125°C	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
MC78M05CDTG	onsemi	Active	500mA	Not Specified	80dB	0°C ~ 125°C	Tube	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the KA7805ERTM in applications requiring full 1A output current, select from the MC7805 series direct substitutes: MC7805BDTG, MC7805BDTRKG, MC7805CDTG, or MC7805CDTRKG. All are active products from onsemi with ROHS3 compliance and identical electrical specifications within the allowed parameter range.

The MC7805CDTG and MC7805CDTRKG variants offer improved PSRR performance (83dB versus 68dB) and lower quiescent current (6.5mA versus 8mA), making them preferred for noise-sensitive applications. However, these parts specify an operating temperature range of 0°C to 125°C, which excludes the lower temperature extreme of the original KA7805ERTM (-40°C).

For applications with maximum output current requirements of 500mA or less, the MC78M05 series provides functional alternatives with active product status and ROHS3 compliance. These parts are available in both tube and cut tape packaging options.

Packaging selection between tube and cut tape variants (BDTG/CDTG versus BDTRKG/CDTRKG) depends on procurement and assembly requirements. Cut tape variants with Digi-Reel® packaging typically offer higher inventory availability and are suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MC78M05 series parts directly replace the KA7805ERTM?

A: MC78M05 series parts are functional alternatives only for applications where output current does not exceed 500mA. The KA7805ERTM is rated for 1A output current. If your application requires the full 1A capability, use MC7805 series direct substitutes instead.

Q: What is the difference between MC7805BDTG and MC7805CDTG?

A: Both are 1A regulators in DPAK packaging. MC7805CDTG offers superior PSRR (83dB versus 68dB) and lower quiescent current (6.5mA versus 8mA). The MC7805CDTG operating temperature range is 0°C to 125°C, while MC7805BDTG extends to -40°C. Select based on your minimum operating temperature requirement.

Q: What does the packaging suffix mean (BDTG versus BDTRKG)?

A: BDTG indicates tube packaging, while BDTRKG indicates cut tape with Digi-Reel® packaging. Both contain identical die and electrical performance. Choose based on your assembly process: tube for manual or small-batch assembly, cut tape for high-volume automated assembly.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed (MC7805 and MC78M05 series) are ROHS3 compliant. The original KA7805ERTM does not specify RoHS status due to its obsolete classification.

Q: Can I use a substitute part with a lower operating temperature range?

A: No. If your application requires operation below 0°C, you must select parts with -40°C minimum rating: MC7805BDTG, MC7805BDTRKG, MC78M05ABDTG, MC78M05ABDTRKG, MC78M05BDTG, or MC78M05BDTRKG. The MC7805CDTG, MC7805CDTRKG, and MC78M05ACDTRKG variants are limited to 0°C minimum.

Q: What inventory levels are available for these substitutes?

A: MC7805BDTRKG has the highest inventory at 115,450 pieces. MC78M05ACDTRKG offers 205,400 pieces for the 500mA variant. Specific inventory levels are provided in the parameter comparison table and should be confirmed with your supplier for current availability.

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