S1A-F Equivalent & Substitute Parts

Part Overview

The S1A-F is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount SMA (DO-214AC) package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with allowable parameter variations within acceptable engineering tolerances.

Substiute Parts

S1A-F

SMC Diode SolutionsIn Stock: 39937S1A-F Datasheet

Current PartRFQ

GS1A

SMC Diode SolutionsIn Stock: 30233GS1A Datasheet

DirectRFQ

S1A

YAGEOIn Stock: 4830S1A Datasheet

Parametric EquivalentRFQ

RS1A-M3/61T

Vishay General Semiconductor - Diodes DivisionIn Stock: 917RS1A-M3/61T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the S1A-F is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
• Current - Average Rectified (Io): Must equal or exceed 1 A
• Package / Case: Must be DO-214AC or SMA equivalent
• Mounting Type: Must be Surface Mount

Acceptable Parameter Variations:

• Voltage - Forward (Vf) (Max) @ If: Allowable variation up to 1.3 V @ 1 A
• Reverse Recovery Time (trr): Allowable variation from 150 ns to 2.5 µs (faster recovery acceptable)
• Current - Reverse Leakage @ Vr: Must not exceed 5 µA @ 50 V
• Capacitance @ Vr, F: Allowable variation from 10 pF to 15 pF @ 4V, 1MHz
• Operating Temperature - Junction: Minimum -55°C acceptable; maximum 150°C acceptable

Substitutes Identified:

1. GS1A (SMC Diode Solutions) — Direct manufacturer equivalent with identical electrical specifications and active product status
2. S1A (YAGEO) — Parametric equivalent with identical core electrical ratings and active product status
3. RS1A-M3/61T (Vishay General Semiconductor - Diodes Division) — Similar substitute with allowable parameter variations in forward voltage, recovery time, and operating temperature range

Parameter Comparison

Engineering Selection Recommendations

GS1A (SMC Diode Solutions) — Recommended Primary Substitute

GS1A is the direct equivalent from the original manufacturer with identical electrical specifications, matching forward voltage, reverse recovery time, and capacitance characteristics. GS1A holds active product status and is ROHS3 compliant, ensuring long-term availability and regulatory compliance. Packaging is Tape & Reel (TR), suitable for automated assembly processes. Current inventory of 30,175 pieces supports production requirements.

S1A (YAGEO) — Recommended Secondary Substitute

S1A from YAGEO provides parametric equivalence with identical core electrical ratings (50 V, 1 A) and active product status. ROHS3 compliance is confirmed. Packaging is Cut Tape (CT) & Digi-Reel®, appropriate for lower-volume or manual assembly applications. Inventory of 4,747 pieces is available.

RS1A-M3/61T (Vishay General Semiconductor - Diodes Division) — Alternative Substitute

RS1A-M3/61T meets the core voltage and current requirements with allowable parameter variations. Forward voltage is 1.3 V @ 1 A (0.2 V higher than the original), and reverse recovery time is 150 ns (significantly faster). Operating temperature range is -55°C ~ 150°C, which is narrower than the original specification. This part is suitable for applications where faster recovery characteristics are beneficial or where the reduced temperature range is acceptable. ROHS3 compliance is confirmed. Tape & Reel packaging supports automated assembly. Inventory of 865 pieces is limited.

Selection Criteria:

• Primary applications: Use GS1A for direct replacement with identical performance characteristics and maximum availability.
• Cost-sensitive applications: Evaluate S1A (YAGEO) for equivalent performance with alternative packaging.
• High-speed switching applications: Consider RS1A-M3/61T where faster recovery time (150 ns) provides circuit performance benefits, provided the narrower operating temperature range (-55°C ~ 150°C) is acceptable.

Frequently Asked Questions (FAQ)

Q: Can GS1A be used as a direct replacement for S1A-F?

A: Yes. GS1A is electrically and mechanically identical to S1A-F, with matching voltage ratings (50 V), current ratings (1 A), forward voltage (1.1 V @ 1 A), reverse recovery time (2.5 µs), and operating temperature range (-65°C ~ 175°C). Both use the DO-214AC (SMA) surface mount package. GS1A is active and ROHS3 compliant.

Q: What is the difference between GS1A and RS1A-M3/61T?

A: Both parts meet the 50 V, 1 A core requirements and use DO-214AC packaging. Key differences are: GS1A has forward voltage of 1.1 V @ 1 A and reverse recovery time of 2.5 µs, while RS1A-M3/61T has forward voltage of 1.3 V @ 1 A and faster reverse recovery time of 150 ns. GS1A operates from -65°C to 175°C; RS1A-M3/61T operates from -55°C to 150°C. RS1A-M3/61T is suitable for applications requiring faster switching performance.

Q: Is the S1A from YAGEO compatible with the original S1A-F?

A: Yes. YAGEO's S1A meets the parametric requirements with identical voltage (50 V) and current (1 A) ratings in the same DO-214AC package. Both are ROHS3 compliant and have MSL 1 (Unlimited) moisture sensitivity. Detailed electrical specifications for YAGEO's S1A are not fully provided, but core ratings ensure functional compatibility.

Q: What packaging options are available for these substitutes?

A: GS1A is supplied in Tape & Reel (TR) packaging for automated assembly. YAGEO's S1A is supplied in Cut Tape (CT) & Digi-Reel® for flexible handling. RS1A-M3/61T is supplied in Tape & Reel (TR). All three use the same DO-214AC (SMA) component package.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. GS1A, S1A (YAGEO), and RS1A-M3/61T are all ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Which substitute has the fastest reverse recovery time?

A: RS1A-M3/61T has a reverse recovery time of 150 ns, significantly faster than the original S1A-F (2.5 µs) and GS1A (2.5 µs). This faster recovery is beneficial in high-frequency switching applications but is not required for standard rectification circuits.

Q: What is the inventory status of each substitute?

A: GS1A has 30,175 pieces in stock, S1A (YAGEO) has 4,747 pieces, and RS1A-M3/61T has 865 pieces. GS1A offers the highest availability for production requirements.