Diotec Semiconductor US1B Equivalent & Substitute Parts

Part Overview

The Diotec Semiconductor US1B is an active general-purpose rectifier diode rated for 100 V DC reverse voltage and 1 A average rectified current in a surface mount SMA/DO-214AC package. This component is designed for standard rectification applications requiring fast recovery characteristics with a reverse recovery time of 50 nanoseconds. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications where the primary part number becomes unavailable or where alternative manufacturers offer compatible specifications.

Substiute Parts

US1B

Diotec SemiconductorIn Stock: 95354US1B Datasheet

Current PartRFQ

ER1B

Diotec SemiconductorIn Stock: 20230ER1B Datasheet

Parametric EquivalentRFQ

US1B_R1_00001

Panjit International Inc.In Stock: 6149US1B_R1_00001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the US1B are classified based on strict electrical and mechanical parameter matching within the rectifier diode category. Substitution eligibility is determined by the following criteria:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 100 V minimum
• Current - Average Rectified (Io): 1 A minimum
• Voltage - Forward (Vf) (Max) @ If: 1 V or lower @ 1 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Mounting Type: Surface Mount
• Package / Case: DO-214AC or SMA compatible

Identified Substitute Parts:

1. ER1B (Diotec Semiconductor) – Parametric Equivalent: Meets all primary criteria with improved reverse recovery time of 35 ns, providing superior switching performance while maintaining identical voltage and current ratings.

2. US1B_R1_00001 (Panjit International Inc.) – Similar Manufacturer Part: Meets all primary criteria with identical reverse recovery time of 50 ns and enhanced reverse leakage specification of 1 µA @ 100 V.

Parameter Comparison

Engineering Selection Recommendations

US1B (Diotec Semiconductor) – Primary Part

The US1B remains the primary specification for applications requiring the exact part number. This component is active in production with 95,300 units in stock. It is suitable for standard general-purpose rectification applications with 100 V reverse voltage and 1 A current ratings.

ER1B (Diotec Semiconductor) – Parametric Equivalent

The ER1B is a parametric equivalent offering improved reverse recovery time of 35 nanoseconds compared to the US1B's 50 nanoseconds. This part is manufactured by the same supplier (Diotec Semiconductor) and is active in production with 20,200 units in stock. The ER1B is suitable for applications where faster switching performance is beneficial without requiring design changes. Both parts maintain identical voltage, current, and forward voltage specifications.

US1B_R1_00001 (Panjit International Inc.) – Similar Manufacturer Part

The US1B_R1_00001 is a similar manufacturer part from Panjit International Inc. that meets all electrical and mechanical requirements of the US1B. This part offers an enhanced reverse leakage specification of 1 µA @ 100 V (compared to 5 µA for the US1B) and an extended lower operating temperature limit of -55°C. The US1B_R1_00001 is ROHS3 compliant and REACH unaffected, with 6,139 units in stock. This part is suitable for applications requiring cross-manufacturer sourcing or where improved reverse leakage performance is advantageous.

Frequently Asked Questions (FAQ)

Q: Can the ER1B be used as a direct replacement for the US1B?

A: Yes. The ER1B meets all electrical and mechanical parameters of the US1B. Both parts share identical voltage ratings (100 V), current ratings (1 A), forward voltage (1 V @ 1 A), and package specifications (DO-214AC, SMA). The ER1B features a faster reverse recovery time of 35 ns versus 50 ns, which provides improved switching performance in rectification circuits.

Q: What is the difference between the US1B and US1B_R1_00001?

A: Both parts meet identical voltage, current, and forward voltage specifications. The US1B_R1_00001 offers two advantages: a lower reverse leakage current of 1 µA @ 100 V (versus 5 µA for the US1B) and an extended lower operating temperature range of -55°C (versus -50°C for the US1B). The US1B_R1_00001 is also ROHS3 compliant and REACH unaffected.

Q: Are all three parts available in the same package?

A: Yes. All three parts (US1B, ER1B, and US1B_R1_00001) use the DO-214AC/SMA surface mount package. However, packaging formats differ: the US1B is supplied in Cut Tape (CT) & Digi-Reel®, while both ER1B and US1B_R1_00001 are supplied in Tape & Reel (TR) format. Verify packaging requirements for your procurement and assembly processes.

Q: Which substitute part should I select for improved switching performance?

A: The ER1B provides the fastest reverse recovery time at 35 nanoseconds, compared to 50 nanoseconds for both the US1B and US1B_R1_00001. Select the ER1B for applications where reduced switching losses and faster recovery characteristics are required.

Q: Which substitute part should I select for lower reverse leakage?

A: The US1B_R1_00001 offers the lowest reverse leakage specification at 1 µA @ 100 V, compared to 5 µA @ 100 V for both the US1B and ER1B. Select the US1B_R1_00001 for applications where minimized reverse leakage current is critical.

Q: Are there compliance or certification differences between these parts?

A: The US1B_R1_00001 is ROHS3 compliant and REACH unaffected. The US1B and ER1B have RoHS status listed as not applicable. Verify compliance requirements for your specific application and regulatory jurisdiction.

Q: Can I mix these parts in the same production run?

A: All three parts meet the same electrical specifications for voltage, current, and forward voltage. However, verify that your circuit design and assembly process accommodate the different packaging formats (Cut Tape versus Tape & Reel) and any compliance certifications required by your application.