S1A-M3/5AT Equivalent & Substitute Parts

Part Overview

The S1A-M3/5AT 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 part is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to address supply chain requirements, inventory availability, or specific application needs while maintaining electrical and mechanical compatibility within the defined parameter range.

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 eligibility for the S1A-M3/5AT is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Up to 1.1 V @ 1 A
Reverse Recovery Time (trr): Up to 1.8 µs (standard recovery) or faster
Current - Reverse Leakage @ Vr: Up to 1 µA @ 50 V
Capacitance @ Vr, F: Up to 12 pF @ 4V, 1MHz
Operating Temperature - Junction: -55°C to 150°C minimum range

Substitute parts are classified into two categories: Parametric Equivalents (identical electrical specifications) and Manufacturer Recommended alternatives (functionally compatible with allowable parameter variations).

Parameter Comparison

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

Engineering Selection Recommendations

Parametric Equivalents (Identical Specifications):

The following parts are direct parametric equivalents to the S1A-M3/5AT and share identical electrical characteristics:

S1A-E3/5AT (Vishay): Active status, 15,282 units in stock. Identical specifications with alternative tape reel configuration.
S1A-E3/61T (Vishay): Active status, 120,800 units in stock. Identical specifications with highest inventory availability.
S1AHE3_A/H (Vishay): Active status, 70,200 units in stock. Automotive-grade variant with AEC-Q101 qualification. Suitable for automotive applications requiring enhanced reliability.
ACGRA4001-HF (Comchip Technology): Active status, 1,013 units in stock. Automotive-grade variant with AEC-Q101 qualification. Identical forward voltage and reverse voltage specifications.

Manufacturer Recommended Alternatives (Functionally Compatible):

The following parts operate within allowable parameter variations and are suitable for applications where forward voltage reduction or faster recovery characteristics are beneficial:

ES1A-13-F (Diodes Incorporated): Active status, 70,300 units in stock. Fast recovery diode with 920 mV forward voltage and 25 ns reverse recovery time. Lower forward voltage reduces power dissipation.
EGF1A (Fairchild Semiconductor): Active status, 39,900 units in stock. Fast recovery diode with 1.0 V forward voltage and 50 ns reverse recovery time.

Not Recommended for New Designs:

The following parts are classified as "Not For New Designs" and should be used only for legacy system maintenance or repair:

ES1A-LTP (Micro Commercial Co): 5,415 units in stock.
GF1A (onsemi): 35,200 units in stock.
GS1A-LTP (Micro Commercial Co): 7,490 units in stock.

Compliance and Certification:

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

Frequently Asked Questions (FAQ)

Q: Can I substitute S1A-E3/61T for S1A-M3/5AT in my design?

A: Yes. S1A-E3/61T is a parametric equivalent with identical electrical specifications (50 V, 1 A, 1.1 V forward voltage, 1.8 µs recovery time) and the same DO-214AC package. The difference is the tape reel configuration. Both are Active status products from Vishay.

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

A: The S1A-M3/5AT has standard recovery characteristics (1.8 µs reverse recovery time). Fast recovery alternatives such as ES1A-13-F (25 ns) and EGF1A (50 ns) switch faster, reducing switching losses in high-frequency applications. However, they may exhibit different reverse leakage characteristics. Selection depends on circuit switching frequency requirements.

Q: Is the automotive-qualified S1AHE3_A/H suitable for non-automotive applications?

A: Yes. The S1AHE3_A/H meets automotive-grade specifications (AEC-Q101) but is fully compatible with standard industrial and consumer applications. It provides enhanced reliability margins and is electrically identical to the S1A-M3/5AT.

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

A: Parts marked "Not For New Designs" (ES1A-LTP, GF1A, GS1A-LTP) are legacy products that remain available for existing system support but are not recommended for new circuit designs. Manufacturers typically apply this status when newer alternatives with improved performance or better availability exist.

Q: Can I use ES1A-13-F as a direct replacement if my circuit operates at high switching frequencies?

A: ES1A-13-F is electrically compatible within the 50 V / 1 A rating and DO-214AC package. Its fast recovery time (25 ns) and lower forward voltage (920 mV) make it suitable for high-frequency switching applications. However, verify that your circuit design does not depend on the specific recovery characteristics of the original S1A-M3/5AT before substitution.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. These parts do not require special moisture-controlled storage or handling procedures and can be stored under standard industrial conditions indefinitely.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts listed in this document are RoHS3 compliant. This ensures compatibility with environmental regulations and procurement requirements for RoHS-restricted applications.

Q: What is the significance of the DO-214AC (SMA) package designation?

A: DO-214AC and SMA are equivalent designations for the same surface mount package. All substitute parts use this identical package, ensuring mechanical and thermal compatibility with the original S1A-M3/5AT in PCB layouts and thermal management designs.

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