S3A-M3/57T Equivalent & Substitute Parts

Part Overview

The S3A-M3/57T is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 50 V DC reverse voltage with a 3 A average rectified current rating in a DO-214AB (SMC) package. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when component availability becomes limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2.5 A	V
Reverse Recovery Time (trr)	2.5	µs
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the S3A-M3/57T is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum
RoHS Compliance: ROHS3 Compliant

Current Rating Consideration:

Primary substitute (S3A-E3/57T): Identical 3 A rating
Secondary substitute (HS5A R7G): Higher 5 A rating (uprating acceptable for design margin)

Recovery Characteristics:

S3A-M3/57T: Standard recovery (>500 ns)
HS5A R7G: Fast recovery (≤500 ns) — faster recovery is compatible with standard recovery applications

All identified substitutes maintain the 50 V reverse voltage specification, DO-214AB package format, and surface mount configuration required for direct replacement.

Parameter Comparison

Parameter	S3A-M3/57T	S3A-E3/57T	HS5A R7G
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	5 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2.5 A	1.15 V @ 2.5 A	1 V @ 5 A
Speed	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤500ns
Reverse Recovery Time (trr)	2.5 µs	2.5 µs	50 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V
Capacitance @ Vr, F	60 pF @ 4V, 1MHz	60 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C
Product Status	Active	Active	Discontinued at DiGi Electronics
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)

Engineering Selection Recommendations

S3A-E3/57T (Parametric Equivalent)

The S3A-E3/57T is a direct parametric equivalent to the S3A-M3/57T. Both parts share identical electrical specifications including 50 V reverse voltage, 3 A current rating, 1.15 V forward voltage, and 2.5 µs reverse recovery time. Both are manufactured by Vishay General Semiconductor and maintain ROHS3 compliance. The S3A-E3/57T is supplied in Tape & Reel packaging with higher inventory availability (15,100 pcs) compared to the S3A-M3/57T (929 pcs). This part is recommended as the primary substitute when the main part number becomes unavailable.

HS5A R7G (Manufacturer Recommended Substitute)

The HS5A R7G is a higher-rated alternative manufactured by Taiwan Semiconductor Corporation. This part maintains the 50 V reverse voltage and DO-214AB package specification but provides a 5 A current rating versus the 3 A rating of the S3A-M3/57T. The HS5A R7G features fast recovery characteristics (50 ns trr) compared to standard recovery (2.5 µs trr) in the main part. This uprating in current capacity and faster recovery time are compatible with applications designed for the S3A-M3/57T. However, the HS5A R7G is discontinued at DiGi Electronics and supplied in Cut Tape packaging. This part is suitable for applications where higher current margin or faster switching performance is acceptable. ROHS3 compliance is maintained.

Compliance and Certification Status

All identified substitutes maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity level. Operating temperature ranges are identical across all parts (-55°C to 150°C junction temperature).

Frequently Asked Questions (FAQ)

Q: Can the S3A-E3/57T be used as a direct replacement for the S3A-M3/57T?

A: Yes. The S3A-E3/57T is a parametric equivalent with identical electrical specifications. Both parts have 50 V reverse voltage, 3 A current rating, 1.15 V forward voltage at 2.5 A, and 2.5 µs reverse recovery time. Both are housed in DO-214AB packages and are ROHS3 compliant. The primary difference is packaging format (Tape & Reel for both) and inventory availability.

Q: Is the HS5A R7G suitable for applications designed for the S3A-M3/57T?

A: The HS5A R7G is compatible with S3A-M3/57T applications. It maintains the 50 V reverse voltage and DO-214AB package specification. The 5 A current rating is higher than the 3 A requirement, providing additional design margin. The faster recovery time (50 ns versus 2.5 µs) is compatible with standard recovery applications. However, verify that the higher capacitance (80 pF versus 60 pF) does not impact circuit performance in high-frequency applications.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for automated assembly lines. Cut Tape (CT) packaging supplies components on tape segments cut to specific lengths, typically for smaller quantity orders or manual assembly. Both formats contain the same component in the same package; the difference is in the delivery and handling format.

Q: Are all substitutes RoHS compliant?

A: Yes. The S3A-E3/57T and HS5A R7G are both ROHS3 compliant, matching the compliance status of the S3A-M3/57T. All parts are REACH unaffected and carry MSL 1 (unlimited) moisture sensitivity level.

Q: What does "Discontinued at DiGi Electronics" mean for the HS5A R7G?

A: This designation indicates that the HS5A R7G is no longer actively stocked or sold through DiGi Electronics as a distributor. The part may still be available through other channels or from manufacturer inventory, but availability is limited. For new designs or long-term supply requirements, the S3A-E3/57T is the recommended choice due to active production status and higher inventory levels.

Q: Can I use a 5 A rated diode in place of a 3 A rated diode?

A: Yes. A higher current-rated component is compatible with applications designed for lower current ratings. The HS5A R7G (5 A) can be used in circuits designed for the S3A-M3/57T (3 A). The circuit will operate within the diode's specifications with additional current margin. Verify that other circuit parameters (forward voltage, recovery time, capacitance) are acceptable for your application.

Q: What is reverse recovery time and why does it matter?

A: Reverse recovery time (trr) is the time required for a diode to stop conducting when the applied voltage reverses polarity. The S3A-M3/57T has a 2.5 µs recovery time (standard recovery), while the HS5A R7G has a 50 ns recovery time (fast recovery). Faster recovery reduces switching losses and electromagnetic interference in high-frequency circuits. Standard recovery diodes are suitable for low-frequency and DC applications. Fast recovery diodes are beneficial in switching power supplies and high-frequency rectification circuits.

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