P6KE43A-T Equivalent & Substitute Parts

Part Overview

The P6KE43A-T is a unidirectional transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection applications. This component features a 36.8V reverse standoff voltage with a 59.3V clamping voltage and 10.1A peak pulse current capability in a through-hole DO-15 package. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new designs.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	36.8	V
Voltage - Breakdown (Min)	40.9	V
Voltage - Clamping (Max) @ Ipp	59.3	V
Current - Peak Pulse (10/1000µs)	10.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P6KE43A-T is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 36.8V
Voltage - Breakdown (Min): 40.9V (±0.1V tolerance acceptable)
Voltage - Clamping (Max) @ Ipp: 59.3V
Current - Peak Pulse (10/1000µs): 10.1A (±0.6A tolerance acceptable)
Power - Peak Pulse: 600W
Mounting Type: Through Hole
Package / Case: DO-15 or DO-204AC equivalent
Type: Zener, Unidirectional (1 channel)

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging. These parts are sourced from different manufacturers but meet all parameter requirements.

Upgrade Substitutes offer improved specifications (higher peak pulse current) while maintaining backward compatibility with the original design envelope.

Manufacturer Recommended Substitutes are designated by original equipment manufacturers as approved alternatives, with minor variations in operating temperature range or packaging format that do not affect circuit functionality.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR (V)	VC (V)	Ipp (A)	Temp Range (°C)	Package	Status
P6KE43A-T	Diodes Incorporated	36.8	40.9	59.3	10.1	-55 to 175	DO-15	Obsolete
P6KE43A-AP	Micro Commercial Co	36.8	40.9	59.3	10.1	-55 to 175	DO-15	Active
P6KE43A-BP	Micro Commercial Co	36.8	40.9	59.3	10.1	-55 to 175	DO-15	Active
P6KE43A	Diotec Semiconductor	36.8	40.9	59.3	10.6	-50 to 175	DO-15	Active
P6KE43A-B	Littelfuse Inc.	36.8	40.9	59.3	10.3	-55 to 175	DO-204AC	Active
P6KE43A-G	Comchip Technology	36.8	40.85	59.3	10.12	-55 to 150	DO-15	Active
P6KE43A-HF	Comchip Technology	36.8	40.85	59.3	10.12	-55 to 150	DO-15	Active
P6KE43A-TP	Micro Commercial Co	36.8	40.9	59.3	10.1	-55 to 175	DO-15	Active
P6KE43A_R2_00001	Panjit International Inc.	36.8	40.9	59.3	10.1	-65 to 175	DO-15	Active
P6KE43AE3/TR13	Microsemi Corporation	36.8	40.9	59.3	10.1	-65 to 150	Axial	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (Preferred for Drop-In Replacement)

P6KE43A-TP (Micro Commercial Co), P6KE43A-AP (Micro Commercial Co), and P6KE43A-BP (Micro Commercial Co) provide exact electrical parameter matching with the original P6KE43A-T. All three maintain the 36.8V standoff voltage, 40.9V breakdown voltage, 59.3V clamping voltage, and 10.1A peak pulse current. These parts are in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). P6KE43A-TP is available in cut tape packaging with the highest inventory (5,156 units), making it the most readily available option.

Upgrade Alternative with Enhanced Performance

P6KE43A (Diotec Semiconductor) offers a 5% increase in peak pulse current (10.6A versus 10.1A) while maintaining all voltage parameters. This part is suitable for applications requiring additional transient current margin. Operating temperature minimum is -50°C versus -55°C for the original part, which is acceptable for most general-purpose applications. ROHS3 compliance is confirmed with 10,300 units in stock.

Manufacturer-Recommended Alternatives

P6KE43A-B (Littelfuse Inc.) is designated as a manufacturer-recommended substitute with identical electrical specifications and full temperature range compatibility (-55 to 175°C). The package designation is DO-204AC, which is mechanically and electrically equivalent to DO-15. P6KE43A-G and P6KE43A-HF (both Comchip Technology) provide equivalent electrical performance with a maximum operating temperature of 150°C, suitable for applications not requiring the full 175°C upper limit.

Extended Temperature Range Option

P6KE43A_R2_00001 (Panjit International Inc.) and P6KE43AE3/TR13 (Microsemi Corporation) extend the minimum operating temperature to -65°C, providing enhanced cold-temperature performance for specialized applications. Both maintain the 36.8V/59.3V voltage specifications and 10.1A current rating.

Frequently Asked Questions (FAQ)

Q: Can P6KE43A-T be directly replaced with any of the listed substitutes?

A: Yes, all listed parts maintain the critical electrical parameters (36.8V standoff, 59.3V clamping, 10.1A peak pulse current) required for direct substitution. Physical package compatibility must be verified: DO-15 and DO-204AC packages are mechanically equivalent for through-hole mounting. Axial package variants (P6KE43AE3/TR13) require board layout verification.

Q: What is the difference between P6KE43A-TP, P6KE43A-AP, and P6KE43A-BP?

A: All three parts are manufactured by Micro Commercial Co with identical electrical specifications. The primary differences are packaging format: P6KE43A-TP is supplied in cut tape (CT), P6KE43A-AP in bulk, and P6KE43A-BP in bulk. Selection depends on procurement volume and assembly line requirements.

Q: Is the Diotec P6KE43A upgrade suitable for existing designs?

A: Yes. The 10.6A peak pulse current (versus 10.1A original) provides additional transient protection margin while maintaining backward compatibility. The -50°C minimum operating temperature is acceptable for most applications; verify if your design requires the full -55°C specification.

Q: What is the significance of the operating temperature range differences?

A: The original P6KE43A-T operates from -55 to 175°C. Comchip variants (P6KE43A-G, P6KE43A-HF) limit the upper temperature to 150°C. Panjit and Microsemi variants extend the lower limit to -65°C. Select based on your application's thermal environment; general-purpose applications typically operate within -40 to 85°C ambient.

Q: Are all substitutes ROHS3 compliant?

A: Yes, all listed active substitutes carry ROHS3 compliance certification. The original P6KE43A-T also meets ROHS3 requirements. Moisture sensitivity level (MSL) is rated 1 (Unlimited) for all parts, indicating no special storage or handling requirements.

Q: Can the axial package variant (P6KE43AE3/TR13) be used interchangeably with DO-15 packages?

A: Electrically, yes. Mechanically, the axial package requires different board layout and mounting considerations compared to DO-15 radial leads. Verify PCB footprint compatibility before selection.

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