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US1B-E3/5AT Equivalent & Substitute Parts
Part Overview
The US1B-E3/5AT 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 features fast recovery characteristics with a 50 ns reverse recovery time, making it suitable for standard rectification applications requiring moderate switching speeds.
The US1B-E3/5AT maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications of the original component, enabling direct replacement or design flexibility across multiple manufacturers.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) Maximum | 100 | V |
| Current - Average Rectified (Io) | 1 | A |
| Voltage - Forward (Vf) Maximum @ If | 1 | V @ 1 A |
| Speed Classification | Fast Recovery ≤ 500ns | - |
| Reverse Recovery Time (trr) | 50 | ns |
| Current - Reverse Leakage @ Vr | 10 | µA @ 100 V |
| Capacitance @ Vr, F | 15 | pF @ 4V, 1MHz |
| Package / Case | DO-214AC, SMA | - |
| Mounting Type | Surface Mount | - |
| Operating Temperature - Junction | -55 to 150 | °C |
| Technology | Standard | - |
| RoHS Status | ROHS3 Compliant | - |
Substitute Part Grouping Explanation
Substitute parts for the US1B-E3/5AT are classified into the following categories based on electrical and mechanical compatibility:
Parametric Equivalent (Direct Replacement): Parts matching all critical electrical specifications including 100 V reverse voltage, 1 A average rectified current, 1 V forward voltage drop at 1 A, fast recovery speed (≤ 500ns), and 50 ns reverse recovery time. These components are interchangeable without circuit modification.
Direct Manufacturer Equivalent (Functional Substitute): Parts from alternative manufacturers meeting the same voltage, current, and package requirements but with different recovery speed classifications or slightly different electrical characteristics. These require evaluation of application-specific switching requirements.
Upgrade Parts (Higher Voltage Rating): Components rated for higher reverse voltages (200 V, 400 V, 1000 V) while maintaining 1 A current rating and DO-214AC packaging. These provide design margin for applications with voltage transients or future specification changes.
Alternative Technology (Schottky): Schottky diode technology offering lower forward voltage drop (770 mV vs. 1 V) and different reverse leakage characteristics, suitable for applications prioritizing efficiency over recovery time performance.
Legacy/Discontinued Status: Parts marked "Not For New Designs" remain functionally compatible but should not be selected for new circuit designs due to manufacturer discontinuation status.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vr (Max) V | Io (A) | Vf (Max) @ 1A (V) | Speed | trr (ns) | Package | Product Status | Technology |
|---|---|---|---|---|---|---|---|---|---|
| US1B-E3/5AT | Vishay | 100 | 1 | 1 | Fast Recovery ≤ 500ns | 50 | DO-214AC | Active | Standard |
| US1B-E3/61T | Vishay | 100 | 1 | 1 | Fast Recovery ≤ 500ns | 50 | DO-214AC | Active | Standard |
| GS1B-LTP | Micro Commercial Co | 100 | 1 | 1 | Standard Recovery >500ns | - | DO-214AC | Not For New Designs | Standard |
| STPS1H100A | STMicroelectronics | 100 | 1 | 0.77 | Fast Recovery ≤ 500ns | - | DO-214AC | Active | Schottky |
| EGF1B | Fairchild Semiconductor | 100 | 1 | 1 | Fast Recovery ≤ 500ns | 50 | DO-214AC | Active | Standard |
| CURA103-G | Comchip Technology | 200 | 1 | 1 | Fast Recovery ≤ 500ns | 50 | DO-214AC | Active | Standard |
| CURA104-G | Comchip Technology | 400 | 1 | 1.3 | Fast Recovery ≤ 500ns | 50 | DO-214AC | Active | Standard |
| CURA107-G | Comchip Technology | 1000 | 1 | 1.7 | Fast Recovery ≤ 500ns | 75 | DO-214AC | Active | Standard |
| ES1B-LTP | Micro Commercial Co | 100 | 1 | 0.95 | Fast Recovery ≤ 500ns | 35 | DO-214AC | Not For New Designs | Standard |
| GF1B | onsemi | 100 | 1 | 1 | Standard Recovery >500ns | 2000 | DO-214AC | Not For New Designs | Standard |
| S1B | YAGEO | 100 | 1 | 1.1 | - | - | DO-214AC | Active | - |
Engineering Selection Recommendations
For Direct Replacement (Parametric Equivalent): Select US1B-E3/61T from Vishay. This part maintains identical electrical specifications and fast recovery characteristics with Active product status, ensuring long-term availability and supply chain continuity. Both parts are RoHS3 compliant with unlimited moisture sensitivity rating.
For Active Product Status Priority: EGF1B (Fairchild Semiconductor) and STPS1H100A (STMicroelectronics) are recommended alternatives. Both maintain Active product status with full RoHS3 compliance. EGF1B provides standard diode technology matching the original specification, while STPS1H100A offers Schottky technology with reduced forward voltage drop (770 mV) for improved efficiency in power conversion applications.
For Higher Voltage Margin Applications: The Comchip Technology CURA series (CURA103-G, CURA104-G, CURA107-G) provides voltage ratings of 200 V, 400 V, and 1000 V respectively, all maintaining 1 A current rating and DO-214AC packaging. These components are suitable for applications requiring design margin against voltage transients or future specification upgrades. All CURA parts maintain Active status and RoHS3 compliance.
For Legacy System Maintenance: GS1B-LTP and GF1B remain functionally compatible but carry "Not For New Designs" status. These parts should only be selected for repair or maintenance of existing systems where original component specifications are required. ES1B-LTP similarly carries legacy status but offers improved reverse recovery time (35 ns) compared to the original 50 ns specification.
Avoid for New Designs: Parts marked "Not For New Designs" (GS1B-LTP, GF1B, ES1B-LTP) should not be selected for new circuit development due to manufacturer discontinuation trajectories.
Frequently Asked Questions (FAQ)
Q: Can US1B-E3/61T be used as a direct replacement for US1B-E3/5AT?
A: Yes. US1B-E3/61T is a parametric equivalent manufactured by Vishay with identical electrical specifications: 100 V reverse voltage, 1 A average rectified current, 1 V forward voltage drop at 1 A, fast recovery speed (≤ 500ns), and 50 ns reverse recovery time. Both components use DO-214AC packaging and maintain Active product status with RoHS3 compliance.
Q: What is the difference between the US1B-E3/5AT and STPS1H100A?
A: The primary difference is diode technology. US1B-E3/5AT uses standard rectifier diode technology with 1 V forward voltage drop, while STPS1H100A is a Schottky diode with 770 mV forward voltage drop. Both operate at 100 V reverse voltage and 1 A current in DO-214AC packages. Schottky technology reduces power dissipation in switching applications but exhibits different reverse leakage characteristics (4 µA vs. 10 µA at 100 V).
Q: Are the Comchip CURA parts suitable replacements for the US1B-E3/5AT?
A: CURA103-G is a direct functional replacement with identical 100 V rating and 1 A current. CURA104-G and CURA107-G provide higher voltage ratings (400 V and 1000 V) while maintaining 1 A current and DO-214AC packaging. These higher-voltage variants are suitable when design margin against voltage transients is required. All CURA parts maintain fast recovery speed (≤ 500ns) and Active product status.
Q: Why are some substitute parts marked "Not For New Designs"?
A: Parts marked "Not For New Designs" (GS1B-LTP, GF1B, ES1B-LTP) indicate manufacturer discontinuation or end-of-life status. These components remain functionally compatible but should only be used for maintenance of existing systems. New circuit designs should select from parts with Active product status to ensure long-term supply availability and manufacturer support.
Q: What is the significance of reverse recovery time (trr) in selecting a substitute?
A: Reverse recovery time determines switching speed performance. The US1B-E3/5AT specifies 50 ns recovery time. Substitute parts with equal or faster recovery times (ES1B-LTP at 35 ns, CURA series at 50-75 ns) are suitable for the same applications. Parts with significantly slower recovery (GF1B at 2 µs) or standard recovery classification (GS1B-LTP, GF1B >500ns) may introduce switching losses in high-frequency applications and should be evaluated against circuit requirements.
Q: Can parts with higher voltage ratings be used in place of the US1B-E3/5AT?
A: Yes. CURA103-G (200 V), CURA104-G (400 V), and CURA107-G (1000 V) can be used in circuits designed for 100 V operation. Higher voltage ratings provide design margin and do not degrade performance in lower-voltage applications. However, forward voltage drop increases with higher ratings (CURA104-G at 1.3 V, CURA107-G at 1.7 V), which may affect power dissipation and circuit efficiency.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the environmental and regulatory requirements of the US1B-E3/5AT.
Q: What packaging considerations apply to these substitutes?
A: All substitute parts use DO-214AC (SMA) surface mount packaging, identical to the US1B-E3/5AT. This ensures mechanical compatibility with existing PCB layouts and assembly processes. Tape & Reel (TR) and Cut Tape (CT) packaging options are available across manufacturers for different procurement and assembly workflows.
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