S1AFM-M3/6B Equivalent & Substitute Parts

Part Overview

The S1AFM-M3/6B is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode is rated for 1000 V DC reverse voltage with 1 A average rectified current and is packaged in the DO-221AC (SlimSMA) form factor. 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 maintained across the specified parameter set, enabling component procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1 A	V
Reverse Recovery Time (trr)	1.47	µs
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Capacitance @ Vr, F	7.9	pF @ 4V, 1MHz
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 S1AFM-M3/6B are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
Mounting Type: Surface Mount
Package / Case: DO-221AC, SMA Flat Leads
Operating Temperature - Junction: -55°C to 150°C
RoHS Status: ROHS3 Compliant or equivalent
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Parameter Variations: Substitute parts may exhibit variations in reverse recovery time (trr), reverse leakage current, and junction capacitance within the standard recovery classification (>500 ns, >200 mA) without affecting functional equivalence in general-purpose rectification applications. Packaging format (Tape & Reel vs. Cut Tape) does not affect electrical performance and is considered a procurement variable.

Parameter Comparison

Parameter	S1AFM-M3/6B (Main)	S1AFM-M3/6A	GS1MAFC_R1_00001	M7F
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Panjit International Inc.	MDD
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A
Reverse Recovery Time (trr)	1.47 µs	1.47 µs	Not specified	Not specified
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	1 µA @ 1000 V	5 µA @ 1000 V
Capacitance @ Vr, F	7.9 pF @ 4V, 1MHz	7.9 pF @ 4V, 1MHz	7 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-221AC, SMA Flat Leads	DO-221AC, SMA Flat Leads	DO-221AC, SMA Flat Leads	DO-221AC, SMA Flat Leads
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

S1AFM-M3/6A (Vishay General Semiconductor)

This part is a parametric equivalent to the S1AFM-M3/6B with identical electrical specifications and operating characteristics. The primary difference is packaging format: S1AFM-M3/6A is supplied in Cut Tape (CT) and Digi-Reel® format, whereas the main part is supplied in Tape & Reel (TR). Both parts maintain ROHS3 compliance and MSL 1 rating. This substitute is suitable for applications requiring identical performance with alternative packaging logistics.

GS1MAFC_R1_00001 (Panjit International Inc.)

This part meets all critical electrical parameters with 1000 V reverse voltage, 1 A average rectified current, and 1.1 V forward voltage. The reverse leakage current is lower at 1 µA compared to 5 µA in the main part, and junction capacitance is slightly reduced at 7 pF. The device maintains ROHS3 compliance and MSL 1 rating. This substitute is suitable for applications where lower reverse leakage is beneficial.

M7F (MDD)

This part meets all critical electrical parameters with 1000 V reverse voltage, 1 A average rectified current, and 1.1 V forward voltage. Junction capacitance is higher at 15 pF compared to 7.9 pF in the main part. The device maintains RoHS compliance and MSL 1 rating. This substitute is suitable for general-purpose rectification applications where the increased capacitance does not impact circuit performance.

Frequently Asked Questions (FAQ)

Q: Can S1AFM-M3/6A be used as a direct replacement for S1AFM-M3/6B?

A: Yes. Both parts are parametric equivalents with identical voltage ratings (1000 V), current ratings (1 A), forward voltage (1.1 V @ 1 A), reverse recovery time (1.47 µs), reverse leakage (5 µA @ 1000 V), and junction capacitance (7.9 pF). The difference is packaging format: S1AFM-M3/6A uses Cut Tape and Digi-Reel, while S1AFM-M3/6B uses Tape & Reel. Both are ROHS3 compliant with MSL 1 rating.

Q: What are the differences between GS1MAFC_R1_00001 and the main part?

A: GS1MAFC_R1_00001 is manufactured by Panjit International Inc. and shares the same voltage (1000 V), current (1 A), and forward voltage (1.1 V @ 1 A) specifications. The reverse leakage current is lower at 1 µA versus 5 µA, and junction capacitance is slightly lower at 7 pF versus 7.9 pF. Both maintain ROHS3 compliance and MSL 1 rating. The lower leakage may be advantageous in high-impedance circuits.

Q: Is M7F compatible with the S1AFM-M3/6B?

A: Yes. M7F meets the critical electrical parameters: 1000 V reverse voltage, 1 A average rectified current, and 1.1 V forward voltage. The junction capacitance is higher at 15 pF compared to 7.9 pF in the main part. Both devices operate across -55°C to 150°C and maintain RoHS compliance with MSL 1 rating. The increased capacitance should be evaluated for specific circuit applications.

Q: Do all substitute parts use the same package?

A: All substitute parts use the DO-221AC (SMA Flat Leads) package, which is mechanically and electrically compatible with the main part. Packaging format (Tape & Reel, Cut Tape, or Digi-Reel) is a procurement variable and does not affect electrical performance or physical fit.

Q: Are there compliance differences between the substitute parts?

A: S1AFM-M3/6A and GS1MAFC_R1_00001 are ROHS3 compliant. M7F is RoHS compliant. All three parts are REACH Unaffected and maintain MSL 1 (Unlimited) moisture sensitivity rating. For applications requiring ROHS3 specifically, S1AFM-M3/6A or GS1MAFC_R1_00001 are preferred.

Q: What is the difference in reverse leakage current between the substitutes?

A: The main part S1AFM-M3/6B and S1AFM-M3/6A both specify 5 µA reverse leakage at 1000 V. GS1MAFC_R1_00001 specifies 1 µA, which is lower. M7F specifies 5 µA. Lower reverse leakage is beneficial in high-impedance or precision analog circuits where leakage current affects circuit performance.

Q: Can I use these parts interchangeably in production?

A: Yes, provided the application does not have specific requirements for reverse leakage current or junction capacitance that exceed the specified ranges. All parts maintain identical voltage and current ratings, forward voltage characteristics, and operating temperature range. Verify that the packaging format (Tape & Reel, Cut Tape, or Digi-Reel) is compatible with your assembly process.

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