Equivalent & Substitute Parts for S1A-M3/61T

Part Overview

The S1A-M3/61T 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 1 A average rectified current in a DO-214AC (SMA) package. The device is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are necessary to address supply chain continuity, inventory optimization, and design flexibility across multiple manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	1	µA @ 50 V
Capacitance @ Vr, F	12	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S1A-M3/61T is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: ≤ 1.1 V @ 1 A
Reverse Recovery Time (trr): ≤ 1.8 µs (standard recovery classification)
Current - Reverse Leakage @ Vr: ≤ 1 µA @ 50 V
Operating Temperature - Junction: -55°C to 150°C minimum

Substitute parts are grouped into three categories: Parametric Equivalents (identical electrical specifications), Manufacturer Recommended Equivalents (alternative manufacturers with compatible specifications), and Automotive-Qualified Variants (AEC-Q101 certified for automotive applications).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs]	Ir @ Vr [µA]	Package	Product Status	RoHS
S1A-M3/61T	Vishay	50	1	1.1 @ 1A	1.8	1 @ 50V	DO-214AC	Active	ROHS3
S1A-E3/5AT	Vishay	50	1	1.1 @ 1A	1.8	1 @ 50V	DO-214AC	Active	ROHS3
S1A-E3/61T	Vishay	50	1	1.1 @ 1A	1.8	1 @ 50V	DO-214AC	Active	ROHS3
S1AHE3_A/H	Vishay	50	1	1.1 @ 1A	1.8	1 @ 50V	DO-214AC	Active	ROHS3
EGF1A	Fairchild Semiconductor	50	1	1.0 @ 1A	0.05	10 @ 50V	DO-214AC	Active	—
ES1A	YAGEO	50	1	0.95	—	—	DO-214AC	Active	ROHS3
ES1A-13-F	Diodes Incorporated	50	1	0.92 @ 1A	0.025	5 @ 50V	DO-214AC	Active	ROHS3
ES1A-LTP	Micro Commercial Co	50	1	0.95 @ 1A	0.035	5 @ 50V	DO-214AC	Not For New Designs	ROHS3
GF1A	onsemi	50	1	1.0 @ 1A	2.0	5 @ 50V	DO-214AC	Not For New Designs	ROHS3
GS1A-LTP	Micro Commercial Co	50	1	1.0 @ 1A	—	10 @ 50V	DO-214AC	Not For New Designs	ROHS3
ACGRA4001-HF	Comchip Technology	50	1	1.1 @ 1A	2.5	5 @ 50V	DO-214AC	Active	ROHS3

Engineering Selection Recommendations

Parametric Equivalents (Identical Specifications): The parts S1A-E3/5AT, S1A-E3/61T, and S1AHE3_A/H are direct parametric equivalents to S1A-M3/61T. All three are manufactured by Vishay with identical electrical characteristics, package configuration, and compliance status. S1AHE3_A/H carries AEC-Q101 automotive qualification and is suitable for automotive applications. These parts are interchangeable for general-purpose rectification applications without design modification.

Manufacturer Recommended Equivalents (Active Status): EGF1A (Fairchild Semiconductor), ES1A (YAGEO), ES1A-13-F (Diodes Incorporated), and ACGRA4001-HF (Comchip Technology) are active products meeting the 50 V, 1 A, DO-214AC specification. ES1A-13-F and EGF1A feature fast recovery characteristics (trr ≤ 50 ns) compared to the standard recovery of S1A-M3/61T (trr = 1.8 µs). ACGRA4001-HF includes AEC-Q101 automotive qualification. These parts are suitable for new designs and provide supply chain alternatives.

Legacy Products (Not For New Designs): ES1A-LTP, GF1A, and GS1A-LTP are classified as Not For New Designs. While electrically compatible, these parts should not be selected for new product development. They are available for legacy system support and repair applications only.

Compliance and Certification: All recommended substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. ACGRA4001-HF and S1AHE3_A/H carry AEC-Q101 automotive qualification for applications requiring automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can S1A-E3/61T be used as a direct replacement for S1A-M3/61T?

A: Yes. S1A-E3/61T is a parametric equivalent with identical voltage rating (50 V), current rating (1 A), forward voltage (1.1 V @ 1 A), reverse recovery time (1.8 µs), and package configuration (DO-214AC). Both are Active products with ROHS3 compliance and MSL 1 rating. The difference in part number suffix reflects packaging reel configuration only.

Q: What is the difference between standard recovery and fast recovery diodes in this product family?

A: Standard recovery diodes (S1A-M3/61T, S1A-E3/61T, S1AHE3_A/H, GF1A, GS1A-LTP) have reverse recovery times of 1.8 µs to 2.5 µs. Fast recovery diodes (EGF1A, ES1A-13-F, ES1A-LTP) have reverse recovery times of 25 ns to 50 ns. Fast recovery types are suitable for high-frequency switching applications, while standard recovery types are appropriate for general-purpose rectification and lower-frequency applications.

Q: Are automotive-qualified variants available?

A: Yes. S1AHE3_A/H and ACGRA4001-HF are both AEC-Q101 qualified for automotive applications. These parts meet automotive reliability and qualification standards and are suitable for automotive circuit designs.

Q: What is the significance of the packaging designation (Tape & Reel vs. Bulk)?

A: Tape & Reel (TR) packaging is standard for automated assembly and high-volume production. Bulk packaging is used for lower-volume applications or manual assembly. The electrical specifications remain identical; packaging affects handling, storage, and assembly process compatibility only.

Q: Can I substitute a fast recovery diode for a standard recovery diode?

A: Electrically, yes. Fast recovery diodes (EGF1A, ES1A-13-F) meet the voltage and current requirements and are pin-compatible in the DO-214AC package. However, fast recovery diodes exhibit lower reverse recovery time and different switching characteristics. Substitution is valid only if the circuit design does not depend on the specific recovery time characteristics of the original standard recovery device.

Q: Why are some parts marked "Not For New Designs"?

A: Parts classified as Not For New Designs (ES1A-LTP, GF1A, GS1A-LTP) are legacy products that remain available for existing system support and repair. Manufacturers recommend using Active status products for new designs to ensure long-term supply availability and access to the latest manufacturing improvements.

Q: Is RoHS3 compliance mandatory for all substitutes?

A: For the S1A-M3/61T application, RoHS3 compliance is required. All recommended substitute parts except EGF1A maintain ROHS3 compliance. EGF1A does not specify RoHS status in the provided data and should be verified for compliance requirements before selection.

Q: What is MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity limitations. The device can be stored at room temperature and humidity without time restrictions prior to soldering. This classification applies to all recommended substitute parts and eliminates moisture-related handling constraints.

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