S1AFJ-M3/6B Equivalent & Substitute Parts

Part Overview

The S1AFJ-M3/6B 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 1 A average rectified current and is housed in a DO-221AC (SlimSMA) package. The device is classified as Active product status and complies with RoHS3 and REACH regulations. 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)	600	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	1.47	µs
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Mounting Type	Surface Mount	—
Package / Case	DO-221AC, SMA Flat Leads	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the S1AFJ-M3/6B are identified based on strict electrical and mechanical equivalence. The critical parameters that determine substitution eligibility are:

Voltage Rating: DC reverse voltage must equal 600 V
Current Rating: Average rectified current must equal 1 A
Forward Voltage: Maximum forward voltage at 1 A must equal 1.1 V
Recovery Characteristics: Standard recovery speed classification with >500 ns recovery time at >200 mA
Package Compatibility: Surface mount configuration with DO-221AC (SMA Flat Leads) mechanical footprint
Temperature Range: Operating junction temperature range of -55°C to 150°C
Regulatory Compliance: RoHS3 compliance and REACH unaffected status

The substitute part GS1JAFC_R1_00001 meets all these criteria and is therefore classified as a parametric equivalent.

Parameter Comparison

Parameter	S1AFJ-M3/6B (Vishay)	GS1JAFC_R1_00001 (Panjit)	Match Status
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	Equivalent
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 600 V	1 µA @ 600 V	Substitute Superior
Capacitance @ Vr, F	7.9 pF @ 4V, 1MHz	7 pF @ 4V, 1MHz	Substitute Superior
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	DO-221AC, SMA Flat Leads	DO-221AC, SMA Flat Leads	Equivalent
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Both the S1AFJ-M3/6B and GS1JAFC_R1_00001 are Active product status devices with full RoHS3 compliance and REACH unaffected status. The devices are electrically equivalent across all primary performance parameters: reverse voltage, forward current, forward voltage drop, and recovery characteristics. Both operate across the identical temperature range and share identical moisture sensitivity classification.

The GS1JAFC_R1_00001 demonstrates superior performance in reverse leakage current (1 µA versus 5 µA at 600 V) and lower junction capacitance (7 pF versus 7.9 pF at 4 V, 1 MHz). These characteristics indicate the substitute part operates within tighter specifications and may provide enhanced performance in applications sensitive to leakage or capacitive effects.

Both devices are surface mount components with mechanically compatible DO-221AC (SMA Flat Leads) packages suitable for automated assembly processes. Selection between these parts may be based on availability, supply chain logistics, or design margin requirements.

Frequently Asked Questions (FAQ)

Q: Can GS1JAFC_R1_00001 be used as a direct replacement for S1AFJ-M3/6B in existing designs?

A: Yes. Both devices share identical electrical ratings (600 V, 1 A, 1.1 V forward voltage) and mechanical compatibility (DO-221AC package with SMA flat leads). No circuit modifications are required.

Q: Are there differences in package dimensions between these parts?

A: Both parts use the DO-221AC (SMA Flat Leads) package designation. Mechanical compatibility is confirmed for surface mount assembly.

Q: What is the significance of the lower reverse leakage current in the GS1JAFC_R1_00001?

A: The substitute part exhibits 1 µA reverse leakage at 600 V compared to 5 µA for the original part. This represents superior leakage performance and may be advantageous in applications where leakage current contributes to power dissipation or circuit performance.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the S1AFJ-M3/6B and GS1JAFC_R1_00001 are RoHS3 compliant, REACH unaffected, and classified with MSL 1 (unlimited moisture sensitivity level).

Q: What is the difference in capacitance between these devices?

A: The S1AFJ-M3/6B has 7.9 pF capacitance at 4 V, 1 MHz, while the GS1JAFC_R1_00001 has 7 pF under identical conditions. This minor difference is negligible in most applications but may be relevant in high-frequency or precision timing circuits.

Q: Are both parts suitable for automated assembly?

A: Yes. Both devices are surface mount components with tape and reel packaging, compatible with standard pick-and-place assembly equipment.

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