AU3PKHM3_A/I Equivalent & Substitute Parts

Part Overview

The AU3PKHM3_A/I is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the TO-277A package. This component operates at 800 V DC reverse voltage with an average rectified current of 1.4 A and features fast recovery characteristics with a reverse recovery time of 75 ns. The part is classified as Active and carries automotive-grade qualification under AEC-Q101 standards. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1.4	A
Voltage - Forward (Vf) (Max) @ If	2.5 @ 3	V @ A
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	10 @ 800	µA @ V
Capacitance @ Vr, F	42 @ 4V, 1MHz	pF
Operating Temperature - Junction	-55 to 175	°C
Package / Case	TO-277, 3-PowerDFN
Mounting Type	Surface Mount
Technology	Avalanche

Substitute Part Grouping Explanation

Substitution of the AU3PKHM3_A/I is determined by strict equivalence across the following critical parameters:

Electrical Performance Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V
Current - Average Rectified (Io): 1.4 A
Voltage - Forward (Vf) (Max) @ If: 2.5 V @ 3 A
Reverse Recovery Time (trr): 75 ns
Current - Reverse Leakage @ Vr: 10 µA @ 800 V
Capacitance @ Vr, F: 42 pF @ 4V, 1MHz

Mechanical & Package Criteria:

Package / Case: TO-277, 3-PowerDFN
Mounting Type: Surface Mount
Supplier Device Package: TO-277A (SMPC)

Compliance & Qualification Criteria:

Technology: Avalanche
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

The substitute part AU3PK-M3/86A meets all specified electrical, mechanical, and compliance parameters and is therefore classified as a parametric equivalent.

Parameter Comparison

Parameter	AU3PKHM3_A/I	AU3PK-M3/86A	Match
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	Yes
Current - Average Rectified (Io)	1.4 A	1.4 A	Yes
Voltage - Forward (Vf) (Max) @ If	2.5 V @ 3 A	2.5 V @ 3 A	Yes
Reverse Recovery Time (trr)	75 ns	75 ns	Yes
Current - Reverse Leakage @ Vr	10 µA @ 800 V	10 µA @ 800 V	Yes
Capacitance @ Vr, F	42 pF @ 4V, 1MHz	42 pF @ 4V, 1MHz	Yes
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 175°C	Yes
Package / Case	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Supplier Device Package	TO-277A (SMPC)	TO-277A (SMPC)	Yes
Technology	Avalanche	Avalanche	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes
Product Status	Active	Active	Yes

Engineering Selection Recommendations

Both the AU3PKHM3_A/I and AU3PK-M3/86A are Active products manufactured by Vishay General Semiconductor - Diodes Division and carry identical electrical specifications, mechanical packaging, and compliance certifications. Selection between these parts is based on availability and supply chain requirements rather than technical differentiation.

The AU3PKHM3_A/I is suitable for applications requiring the specific part number designation or when inventory of this variant is available. The AU3PK-M3/86A provides equivalent functionality and is suitable for applications where this variant designation is acceptable and inventory availability is prioritized.

Both parts satisfy automotive-grade requirements under AEC-Q101 qualification and maintain ROHS3 compliance and REACH unaffected status. The identical electrical performance across all specified parameters ensures direct substitution without circuit redesign or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can AU3PK-M3/86A be used as a direct replacement for AU3PKHM3_A/I?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, reverse voltage rating (800 V), average rectified current (1.4 A), forward voltage (2.5 V @ 3 A), reverse recovery time (75 ns), and package configuration (TO-277A SMPC). No circuit modifications are required.

Q: Are the package dimensions identical between these parts?

A: Yes. Both parts use the TO-277, 3-PowerDFN package in the TO-277A (SMPC) supplier device package configuration. PCB footprints and mounting procedures are identical.

Q: Do both parts meet automotive qualification standards?

A: The AU3PKHM3_A/I carries AEC-Q101 automotive-grade qualification. Both parts maintain identical compliance status including ROHS3 compliance, REACH unaffected designation, and MSL 1 (Unlimited) moisture sensitivity level.

Q: What is the difference between AU3PKHM3_A/I and AU3PK-M3/86A?

A: The parts are functionally and electrically identical. The difference is in the manufacturer's part number designation and packaging variant code. Both are manufactured by Vishay General Semiconductor - Diodes Division and share the same base product number AU3.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The identical electrical parameters, thermal operating range (-55°C to 175°C), and mechanical package specifications ensure complete interchangeability without design modifications or performance impact.

Q: What is the reverse recovery time specification for these diodes?

A: Both parts specify a reverse recovery time (trr) of 75 ns, classified as fast recovery with speed specification of ≤ 500 ns for currents > 200 mA (Io).

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