US1A-M3/5AT Equivalent & Substitute Parts

Part Overview

The US1A-M3/5AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 50 V DC reverse voltage with 1 A average rectified current and is housed in a DO-214AC (SMA) package. 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 range. The US1A-M3/5AT has documented substitute options from both Vishay and alternative manufacturers that meet the same functional requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 50 V
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

Substitute parts for the US1A-M3/5AT are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1 V @ 1 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C to 150°C

All identified substitute parts maintain these core electrical specifications and physical package compatibility. Variations in secondary parameters such as reverse recovery time (trr), reverse leakage current, and junction capacitance do not disqualify substitution when primary parameters remain within specification.

Parameter Comparison

Parameter	US1A-M3/5AT (Vishay)	US1A-E3/5AT (Vishay)	US1A-E3/61T (Vishay)	ES1A-HF (Comchip)	US1A_R1_00001 (Panjit)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Comchip Technology	Panjit International Inc.
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	Not specified	50 ns	50 ns	35 ns	50 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	5 µA @ 50 V	1 µA @ 50 V
Capacitance @ Vr, F	Not specified	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	17 pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and full compliance with RoHS3 and REACH regulations. Selection between the US1A-M3/5AT and its substitutes is based on availability, inventory levels, and manufacturer preference within the design specification.

Vishay General Semiconductor Options (US1A-E3/5AT, US1A-E3/61T): These parts are direct Vishay alternatives with documented reverse recovery time specifications (50 ns) and junction capacitance data (15 pF @ 4V, 1MHz). Both maintain identical electrical performance to the primary part.

Comchip Technology Option (ES1A-HF): This substitute provides improved reverse leakage current performance (5 µA @ 50 V versus 10 µA @ 50 V) and faster reverse recovery time (35 ns). All primary electrical and mechanical parameters remain equivalent.

Panjit International Inc. Option (US1A_R1_00001): This substitute demonstrates superior reverse leakage current performance (1 µA @ 50 V) while maintaining all primary specifications. Reverse recovery time is specified at 50 ns.

All parts are surface mount devices in DO-214AC (SMA) package format with unlimited moisture sensitivity rating (MSL 1) and identical operating temperature range (-55°C to 150°C).

Frequently Asked Questions (FAQ)

Q: Can US1A-E3/5AT replace US1A-M3/5AT in existing designs?

A: Yes. The US1A-E3/5AT maintains identical voltage (50 V), current (1 A), forward voltage (1 V @ 1 A), speed classification (Fast Recovery ≤ 500ns), package (DO-214AC, SMA), and operating temperature range (-55°C to 150°C). Both are Active status products with ROHS3 compliance.

Q: What is the difference between US1A-E3/5AT and US1A-E3/61T?

A: Both parts are manufactured by Vishay and share identical electrical specifications and package format. The primary difference is the tape and reel configuration (5AT versus 61T). Electrical performance and mechanical compatibility are equivalent.

Q: Is ES1A-HF from Comchip Technology a direct substitute?

A: Yes. The ES1A-HF meets all primary substitution criteria: 50 V reverse voltage, 1 A average rectified current, 1 V forward voltage, fast recovery speed classification, DO-214AC (SMA) package, and -55°C to 150°C operating temperature. The ES1A-HF exhibits lower reverse leakage current (5 µA) and faster reverse recovery time (35 ns) compared to the main part specification.

Q: Can I use US1A_R1_00001 from Panjit as a substitute?

A: Yes. The US1A_R1_00001 meets all primary electrical and mechanical requirements. This part demonstrates the lowest reverse leakage current (1 µA @ 50 V) among all listed substitutes while maintaining identical voltage, current, and package specifications.

Q: Are all substitute parts available in the same package format?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package. Physical footprint and mounting compatibility are identical across all listed alternatives.

Q: Do all substitute parts have the same moisture sensitivity rating?

A: Yes. All parts, including the main US1A-M3/5AT and all substitutes, carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage and handling.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across the identical junction temperature range of -55°C to 150°C, matching the US1A-M3/5AT specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, consistent with the primary part specification.

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