S3AFJ-M3/I Equivalent & Substitute Parts

Part Overview

The S3AFJ-M3/I is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 600 V DC reverse voltage with a 3 A average rectified current rating and is housed in a DO-221AC (SlimSMA) package. The device is qualified to AEC-Q101 automotive standards and maintains active product status. Substitute parts are identified to provide design flexibility, inventory management options, and supply chain continuity while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 3 A	V
Reverse Recovery Time (trr)	2.7	µs
Current - Reverse Leakage @ Vr	10 @ 600 V	µA
Capacitance @ Vr, F	28 @ 4V, 1MHz	pF
Package / Case	DO-221AC, SMA Flat Leads	—
Operating Temperature - Junction	-55 to 175	°C
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S3AFJ-M3/I is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part S3AFJHM3/I is classified as a parametric equivalent because it maintains identical specifications across the following key criteria:

Voltage rating: 600 V DC reverse voltage
Current rating: 3 A average rectified current
Forward voltage drop: 1.1 V maximum at 3 A
Reverse recovery time: 2.7 µs
Reverse leakage current: 10 µA at 600 V
Package type: DO-221AC (SlimSMA) with SMA flat leads
Mounting technology: Surface mount
Temperature range: -55°C to 175°C junction temperature
Automotive qualification: AEC-Q101
Environmental compliance: ROHS3 compliant

Both parts are manufactured by the same supplier and share identical product status (Active), technology classification (Standard), and regulatory compliance profiles.

Parameter Comparison

Parameter	S3AFJ-M3/I	S3AFJHM3/I	Match
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Yes
Category	Diodes, Rectifiers	Diodes, Rectifiers	Yes
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	Yes
Current - Average Rectified (Io)	3 A	3 A	Yes
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3 A	1.1 V @ 3 A	Yes
Reverse Recovery Time (trr)	2.7 µs	2.7 µs	Yes
Current - Reverse Leakage @ Vr	10 µA @ 600 V	10 µA @ 600 V	Yes
Capacitance @ Vr, F	28 pF @ 4V, 1MHz	28 pF @ 4V, 1MHz	Yes
Package / Case	DO-221AC, SMA Flat Leads	DO-221AC, SMA Flat Leads	Yes
Operating Temperature - Junction	-55°C to 175°C	-55°C to 175°C	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Grade	Automotive	Automotive	Yes
Qualification	AEC-Q101	AEC-Q101	Yes
Product Status	Active	Active	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Yes

Engineering Selection Recommendations

Both the S3AFJ-M3/I and S3AFJHM3/I are suitable for direct substitution in applications requiring a 600 V, 3 A general-purpose rectifier diode. Selection between these parts is based on availability and supply chain considerations rather than electrical or mechanical differentiation.

The S3AFJHM3/I carries equivalent automotive qualification (AEC-Q101) and environmental compliance (ROHS3) as the primary part. Both devices maintain the same operating temperature range (-55°C to 175°C junction temperature) and moisture sensitivity classification (MSL 1 - Unlimited), confirming compatibility in identical application environments.

The DO-221AC (SlimSMA) package with SMA flat leads ensures mechanical and thermal compatibility in existing PCB layouts. Surface mount mounting technology is consistent across both parts, requiring no design modifications for substitution.

Frequently Asked Questions (FAQ)

Q: Can S3AFJHM3/I be used as a direct replacement for S3AFJ-M3/I?

A: Yes. The S3AFJHM3/I is a parametric equivalent with identical electrical ratings (600 V, 3 A), forward voltage characteristics (1.1 V @ 3 A), reverse recovery time (2.7 µs), and package specifications (DO-221AC, SMA flat leads). No circuit modifications are required.

Q: Are there any differences in automotive qualification between these parts?

A: No. Both parts carry AEC-Q101 qualification and are classified as automotive-grade components. They are equivalent for use in automotive applications.

Q: Do these parts have the same moisture sensitivity level?

A: Yes. Both the S3AFJ-M3/I and S3AFJHM3/I are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Are the package dimensions and PCB footprints identical?

A: Yes. Both parts use the DO-221AC (SlimSMA) package with SMA flat leads. PCB layouts and thermal management designs require no modification for substitution.

Q: What is the operating temperature range for both parts?

A: Both parts operate across a junction temperature range of -55°C to 175°C, providing identical thermal performance specifications.

Q: Are both parts RoHS compliant?

A: Yes. Both the S3AFJ-M3/I and S3AFJHM3/I are ROHS3 compliant and REACH unaffected, meeting current environmental regulatory requirements.

Q: Is there a difference in reverse leakage current between these parts?

A: No. Both parts specify a maximum reverse leakage current of 10 µA at 600 V, ensuring identical leakage performance in circuit applications.

Q: Can these parts be used interchangeably in high-frequency switching applications?

A: Yes. Both parts share identical reverse recovery time specifications (2.7 µs) and capacitance characteristics (28 pF @ 4V, 1MHz), supporting equivalent performance in switching circuits.

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