US1B-M3/5AT Equivalent & Substitute Parts

Part Overview

The US1B-M3/5AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 100 V DC reverse voltage with 1 A average rectified current in a DO-214AC (SMA) package. The device is classified as Active product status with fast recovery characteristics suitable for standard rectification applications.

Substitute parts become necessary when the primary part number reaches end-of-life status, inventory constraints occur, or alternative sourcing is required while maintaining electrical and mechanical compatibility. All substitute parts listed maintain identical or superior electrical performance within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	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 @ 100 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

Substitution eligibility for the US1B-M3/5AT is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 100 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

Acceptable Parameter Variations:

Current - Reverse Leakage @ Vr: Equal to or lower than 10 µA @ 100 V
Reverse Recovery Time (trr): Equal to or lower than 500 ns
Capacitance @ Vr, F: Variations acceptable within standard tolerances
RoHS Status: ROHS3 Compliant or equivalent
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed meet or exceed these criteria and are electrically and mechanically interchangeable with the US1B-M3/5AT.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status
US1B-M3/5AT	Vishay General Semiconductor	100	1	1 @ 1A	-	10 @ 100V	DO-214AC (SMA)	Active
US1B-E3/5AT	Vishay General Semiconductor	100	1	1 @ 1A	50	10 @ 100V	DO-214AC (SMA)	Active
US1B-E3/61T	Vishay General Semiconductor	100	1	1 @ 1A	50	10 @ 100V	DO-214AC (SMA)	Active
ES1B-HF	Comchip Technology	100	1	1 @ 1A	35	5 @ 100V	DO-214AC (SMA)	Active
HS1B R3G	Taiwan Semiconductor Corporation	100	1	1 @ 1A	50	5 @ 100V	DO-214AC (SMA)	Discontinued at DiGi Electronics
US1B R3G	Taiwan Semiconductor Corporation	100	1	1 @ 1A	50	5 @ 100V	DO-214AC (SMA)	Discontinued at DiGi Electronics
US1B_R1_00001	Panjit International Inc.	100	1	1 @ 1A	50	1 @ 100V	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

The US1B-E3/5AT and US1B-E3/61T from Vishay General Semiconductor are direct parametric equivalents with Active product status. Both parts provide specified reverse recovery time (50 ns) and maintain all electrical specifications identical to the US1B-M3/5AT. These parts are recommended for new designs and ongoing production requiring maximum supply chain stability.

The ES1B-HF from Comchip Technology is an Active product offering superior performance characteristics with reduced reverse recovery time (35 ns) and lower reverse leakage current (5 µA @ 100 V). This part is suitable for applications where improved switching performance is beneficial.

The US1B_R1_00001 from Panjit International Inc. is an Active product with the lowest reverse leakage current specification (1 µA @ 100 V), providing enhanced performance for low-leakage applications while maintaining all other electrical parameters.

Secondary Substitutes (Discontinued Status):

The HS1B R3G and US1B R3G from Taiwan Semiconductor Corporation are listed as Discontinued at DiGi Electronics. These parts maintain full electrical compatibility but should be considered only when existing inventory is available and long-term supply is not required.

Compliance Considerations:

All substitute parts listed are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the US1B-M3/5AT. All parts are suitable for applications requiring RoHS certification and unrestricted moisture handling.

Frequently Asked Questions (FAQ)

Q: Can US1B-E3/5AT replace US1B-M3/5AT in existing designs?

A: Yes. The US1B-E3/5AT is a parametric equivalent with identical voltage, current, and forward voltage specifications. Both parts use the DO-214AC (SMA) package and surface mount technology. The primary difference is the specified reverse recovery time (50 ns for US1B-E3/5AT versus unspecified for US1B-M3/5AT), which represents improved or equivalent performance.

Q: What is the difference between US1B-E3/5AT and US1B-E3/61T?

A: Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications. The difference lies in packaging configuration: US1B-E3/5AT is supplied in Tape & Reel (TR) format, while US1B-E3/61T is also supplied in Tape & Reel (TR) format. Both are suitable for automated assembly processes.

Q: Is ES1B-HF from Comchip Technology a suitable substitute?

A: Yes. The ES1B-HF meets all mandatory electrical parameters and offers superior performance with reduced reverse recovery time (35 ns) and lower reverse leakage current (5 µA @ 100 V). The part uses the identical DO-214AC (SMA) package and is ROHS3 Compliant with MSL 1 rating.

Q: Why are HS1B R3G and US1B R3G listed as discontinued?

A: Both parts are marked as Discontinued at DiGi Electronics, indicating they are no longer actively distributed through this supplier channel. While electrically compatible, these parts should not be selected for new designs or long-term production requirements. Existing inventory may be available through alternative distribution channels.

Q: What does reverse recovery time (trr) indicate?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking state. Lower values indicate faster switching performance. The US1B-M3/5AT specification does not define this parameter, while substitute parts specify values between 35 ns and 50 ns, all within the fast recovery classification.

Q: Are all substitute parts suitable for automated surface mount assembly?

A: Yes. All substitute parts use Surface Mount technology with DO-214AC (SMA) package configuration. Packaging formats include Tape & Reel (TR) and Cut Tape (CT), both suitable for automated pick-and-place assembly equipment.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias condition. The US1B-M3/5AT specifies 10 µA @ 100 V. Substitute parts offer equal or lower values (5 µA or 1 µA), indicating equal or superior performance. Lower leakage current is beneficial in low-power or precision applications.

Q: Are all parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant, matching the compliance status of the US1B-M3/5AT. All parts are suitable for applications requiring RoHS certification and environmental compliance.

Q: What does Moisture Sensitivity Level (MSL) 1 mean?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. No baking or desiccant storage is required prior to assembly.

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