US1A-M3/61T Equivalent & Substitute Parts

Part Overview

The US1A-M3/61T 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 required due to component availability, supply chain considerations, or design flexibility within the same functional category.

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
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Capacitance @ Vr, F	15	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

Substitute parts for the US1A-M3/61T 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
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C to 150°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Secondary Parameters (Allowable Variation):

Reverse Recovery Time (trr): ≤ 50 ns
Current - Reverse Leakage @ Vr: ≤ 10 µA @ 50 V
Capacitance @ Vr, F: 15–17 pF @ 4V, 1MHz

All identified substitute parts maintain identical primary electrical ratings and package specifications. Variations in secondary parameters remain within acceptable engineering tolerances for general-purpose rectification applications.

Parameter Comparison

Parameter	US1A-M3/61T (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
Reverse Recovery Time (trr)	50 ns	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	15 pF @ 4V, 1MHz	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°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C 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 among equivalent parts is determined by availability and secondary performance characteristics.

US1A-E3/5AT (Vishay): Identical electrical and mechanical specifications to the main part. Suitable for direct substitution with equivalent performance profile.

US1A-E3/61T (Vishay): Identical electrical and mechanical specifications to the main part. Suitable for direct substitution with equivalent performance profile.

ES1A-HF (Comchip Technology): Meets all primary substitution criteria. Demonstrates improved reverse recovery time (35 ns versus 50 ns) and reduced reverse leakage current (5 µA versus 10 µA). Capacitance specification remains within acceptable range.

US1A_R1_00001 (Panjit International Inc.): Meets all primary substitution criteria. Demonstrates superior reverse leakage current performance (1 µA versus 10 µA). Capacitance specification is within acceptable tolerance (17 pF versus 15 pF). Reverse recovery time matches primary specification.

All parts are classified as general-purpose rectifier diodes with fast recovery characteristics and are suitable for applications requiring 50 V, 1 A surface mount rectification in DO-214AC (SMA) packaging.

Frequently Asked Questions (FAQ)

Q: Can US1A-E3/5AT be used as a direct replacement for US1A-M3/61T?

A: Yes. Both parts share identical electrical ratings (50 V, 1 A), forward voltage drop (1 V @ 1 A), reverse recovery time (50 ns), reverse leakage current (10 µA @ 50 V), and package specification (DO-214AC, SMA). Both are manufactured by Vishay General Semiconductor and comply with RoHS3 and REACH requirements.

Q: What is the difference between ES1A-HF and the Vishay US1A variants?

A: ES1A-HF is manufactured by Comchip Technology and maintains identical primary electrical specifications and packaging. The ES1A-HF exhibits faster reverse recovery time (35 ns versus 50 ns) and lower reverse leakage current (5 µA versus 10 µA). These represent performance improvements within the same functional category.

Q: Are all substitute parts available in the same DO-214AC (SMA) package?

A: Yes. All substitute parts listed are housed in DO-214AC (SMA) surface mount packages and are compatible with identical PCB layouts and reflow soldering processes.

Q: Does US1A_R1_00001 from Panjit International Inc. meet the same compliance standards?

A: Yes. US1A_R1_00001 is RoHS3 compliant, REACH unaffected, and carries MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the main part.

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

A: All substitute parts operate across the junction temperature range of -55°C to 150°C, identical to the US1A-M3/61T specification.

Q: Can capacitance variation between 15 pF and 17 pF affect circuit performance?

A: Capacitance variation within this range (15–17 pF @ 4V, 1MHz) is within standard engineering tolerance for general-purpose rectifier applications and does not affect substitution compatibility for typical rectification circuits.

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