AS4PJ-M3/87A Equivalent & Substitute Parts

Part Overview

The AS4PJ-M3/87A is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 600V DC reverse voltage and 2.4A average rectified current in a surface mount TO-277A (SMPC) package. This part is classified as Active and complies with RoHS3 and REACH requirements. Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications required for direct circuit replacement or functional equivalence in rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	2.4	A
Voltage - Forward (Vf) (Max) @ If	962 mV @ 2 A	mV
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	10	µA @ 600 V
Technology	Avalanche	-
Package / Case	TO-277, 3-PowerDFN	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the AS4PJ-M3/87A are identified based on the following critical parameters:

Electrical Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 600V minimum
Current - Average Rectified (Io): 2.4A minimum
Forward voltage characteristics compatible with circuit requirements
Reverse recovery time and leakage current within acceptable operating ranges

Mechanical Compatibility Criteria:

Surface mount package configuration
Footprint compatibility with TO-277A or equivalent power package
Moisture Sensitivity Level (MSL) rating of 1 or better

Compliance Requirements:

RoHS3 Compliant status
REACH Unaffected status
Active product status

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (functionally equivalent with different package or technology).

Parameter Comparison

Parameter	AS4PJ-M3/87A	AS4PJ-M3/86A	STTH3R06U
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Category	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers
Technology	Avalanche	Avalanche	Standard
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V
Current - Average Rectified (Io)	2.4 A	2.4 A	3 A
Voltage - Forward (Vf) (Max) @ If	962 mV @ 2 A	962 mV @ 2 A	1.7 V @ 3 A
Reverse Recovery Time (trr)	1.8 µs	1.8 µs	35 ns
Current - Reverse Leakage @ Vr	10 µA @ 600 V	10 µA @ 600 V	3 µA @ 600 V
Package / Case	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 175 °C	-55 to 175 °C	175 °C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

AS4PJ-M3/86A (Parametric Equivalent)

The AS4PJ-M3/86A is a direct parametric equivalent to the AS4PJ-M3/87A. Both parts share identical electrical specifications, package configuration, and compliance certifications. This substitute provides equivalent performance with higher inventory availability (1800 pcs vs. 972 pcs). Selection of this part requires no circuit redesign or thermal analysis modifications. Both parts maintain Active product status and full RoHS3 and REACH compliance.

STTH3R06U (Manufacturer-Recommended Alternative)

The STTH3R06U is a manufacturer-recommended alternative with different technology and package configuration. This part exceeds the voltage and current ratings of the primary part (600V, 3A vs. 600V, 2.4A) and features significantly faster reverse recovery time (35 ns vs. 1.8 µs). The package differs from TO-277A to DO-214AA (SMB), requiring PCB footprint verification. Forward voltage characteristics differ (1.7V @ 3A vs. 962 mV @ 2A), which may impact power dissipation calculations. This substitute is suitable for applications where faster switching performance and higher current capacity are beneficial or required. All compliance certifications (RoHS3, REACH) are maintained.

Frequently Asked Questions (FAQ)

Q: Can AS4PJ-M3/86A be used as a direct replacement for AS4PJ-M3/87A?

A: Yes. The AS4PJ-M3/86A is a parametric equivalent with identical electrical specifications, package type (TO-277A), and compliance status. No circuit modifications are required.

Q: What are the key differences between AS4PJ-M3/87A and STTH3R06U?

A: The primary differences are technology (Avalanche vs. Standard), package (TO-277A vs. SMB), reverse recovery time (1.8 µs vs. 35 ns), and forward voltage characteristics (962 mV @ 2A vs. 1.7V @ 3A). The STTH3R06U provides higher current capacity and faster switching but requires PCB footprint changes.

Q: Is the STTH3R06U package compatible with the AS4PJ-M3/87A PCB layout?

A: No. The STTH3R06U uses a DO-214AA (SMB) package, while the AS4PJ-M3/87A uses TO-277A (3-PowerDFN). PCB footprint verification and potential layout modifications are required before substitution.

Q: Do all substitute parts maintain RoHS3 and REACH compliance?

A: Yes. All listed substitute parts (AS4PJ-M3/86A and STTH3R06U) are RoHS3 Compliant and REACH Unaffected, matching the compliance status of the primary part.

Q: What is the impact of different reverse recovery times on circuit performance?

A: Reverse recovery time affects switching speed and switching losses. The STTH3R06U (35 ns) switches significantly faster than the AS4PJ-M3/87A (1.8 µs). In high-frequency applications, faster recovery reduces switching losses; in low-frequency applications, the difference is negligible.

Q: Can STTH3R06U handle the same current as AS4PJ-M3/87A?

A: The STTH3R06U is rated for 3A average rectified current, exceeding the 2.4A rating of the AS4PJ-M3/87A. It can handle the same current with additional capacity margin.

Q: Are there inventory considerations for part selection?

A: Yes. AS4PJ-M3/86A has higher inventory availability (1800 pcs) compared to AS4PJ-M3/87A (972 pcs). STTH3R06U has the highest availability (10100 pcs). Inventory levels may influence procurement decisions based on lead time requirements.

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