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Equivalent & Substitute Parts for US1A-13 Ultrafast Rectifier Diode
Part Overview
The US1A-13 is an ultrafast rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount SMA package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.
The US1A-13 operates across a junction temperature range of -65°C to 150°C with a reverse recovery time of 50 nanoseconds, classifying it as a fast recovery rectifier suitable for general-purpose switching applications. The part is RoHS non-compliant, which may restrict its use in certain regulated applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) Maximum | 50 | V |
| Current - Average Rectified (Io) | 1 | A |
| Voltage - Forward (Vf) Maximum @ If | 1 | V @ 1 A |
| Reverse Recovery Time (trr) | 50 | ns |
| Current - Reverse Leakage @ Vr | 5 | µA @ 50 V |
| Capacitance @ Vr, F | 20 | pF @ 4V, 1MHz |
| Package / Case | DO-214AC, SMA | — |
| Operating Temperature - Junction | -65 to 150 | °C |
| Speed Classification | Fast Recovery ≤ 500ns, > 200mA (Io) | — |
| Mounting Type | Surface Mount | — |
Substitute Part Grouping Explanation
Substitution of the US1A-13 rectifier diode is determined by strict equivalence across the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Voltage - DC Reverse (Vr) Maximum: 50 V
- Current - Average Rectified (Io): 1 A
- Voltage - Forward (Vf) Maximum @ If: 1 V @ 1 A (or lower)
- Reverse Recovery Time (trr): 50 ns (or faster)
- Current - Reverse Leakage @ Vr: 5 µA @ 50 V (or lower)
- Package / Case: DO-214AC (SMA) or DO-214BA (GF1)
- Mounting Type: Surface Mount
- Operating Temperature - Junction: -65°C minimum to 150°C minimum
Secondary Considerations:
- Capacitance @ Vr, F: 20 pF @ 4V, 1MHz (or lower acceptable)
- Product Status: Active preferred for new designs; discontinued parts acceptable for legacy support
- RoHS Compliance: ROHS3 Compliant preferred; RoHS non-compliant acceptable for non-regulated applications
Substitutes are grouped into three categories: parametric equivalents (identical electrical specifications with different packaging or supplier), direct manufacturer alternatives (different package but equivalent performance), and manufacturer-recommended alternatives (acceptable performance variations within application tolerance).
Parameter Comparison
| Part Number | Manufacturer | Vr (Max) V | Io (A) | Vf (Max) @ If (V) | trr (ns) | Ir @ Vr (µA) | Package | Temp Range (°C) | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|
| US1A-13 | Diodes Incorporated | 50 | 1 | 1 @ 1A | 50 | 5 @ 50V | DO-214AC (SMA) | -65 to 150 | Discontinued | Non-compliant |
| US1A-13-F | Diodes Incorporated | 50 | 1 | 1 @ 1A | 50 | 5 @ 50V | DO-214AC (SMA) | -65 to 150 | Active | ROHS3 Compliant |
| EGF1A-E3/5CA | Vishay General Semiconductor | 50 | 1 | 1 @ 1A | 50 | 5 @ 50V | DO-214BA (GF1) | -65 to 175 | Active | ROHS3 Compliant |
| EGF1A-E3/67A | Vishay General Semiconductor | 50 | 1 | 1 @ 1A | 50 | 5 @ 50V | DO-214BA (GF1) | -65 to 175 | Active | ROHS3 Compliant |
| CGRA4001-G | Comchip Technology | 50 | 1 | 1.1 @ 1A | — | 5 @ 50V | DO-214AC (SMA) | -55 to 150 | Active | ROHS3 Compliant |
| EGF1A | Fairchild Semiconductor | 50 | 1 | 1 @ 1A | 50 | 10 @ 50V | DO-214AC (SMA) | -65 to 175 | Active | — |
| ES1A | YAGEO | — | — | — | — | — | DO-214AC | — | Active | ROHS3 Compliant |
| ES1A-E3/5AT | Vishay General Semiconductor | 50 | 1 | 0.92 @ 1A | 25 | 5 @ 50V | DO-214AC (SMA) | -55 to 155 | Active | ROHS3 Compliant |
| ES1A-E3/61T | Vishay General Semiconductor | 50 | 1 | 0.92 @ 1A | 25 | 5 @ 50V | DO-214AC (SMA) | -55 to 150 | Active | ROHS3 Compliant |
| ES1A-LTP | Micro Commercial Co | 50 | 1 | 0.95 @ 1A | 35 | 5 @ 50V | DO-214AC (SMA) | -65 to 175 | Not For New Designs | ROHS3 Compliant |
| GS1A-LTP | Micro Commercial Co | 50 | 1 | 1 @ 1A | — | 10 @ 50V | DO-214AC (SMA) | -55 to 150 | Not For New Designs | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: US1A-13-F
The US1A-13-F from Diodes Incorporated is the direct parametric equivalent to the discontinued US1A-13. This part maintains identical electrical specifications (50 V, 1 A, 50 ns reverse recovery time, 1 V forward voltage) and package configuration (DO-214AC SMA). The US1A-13-F is currently active in production and carries ROHS3 compliance certification, making it suitable for both legacy replacement and new design applications. Inventory availability is confirmed at 25,300 pieces.
Secondary Recommendations for Active Designs:
For applications requiring enhanced temperature performance, the EGF1A-E3/5CA and EGF1A-E3/67A from Vishay General Semiconductor provide identical electrical performance with extended operating temperature range (-65°C to 175°C versus -65°C to 150°C). These parts use the DO-214BA (GF1) package instead of DO-214AC (SMA), requiring PCB layout verification for mechanical compatibility. Both parts are ROHS3 compliant and actively produced.
The ES1A-E3/5AT and ES1A-E3/61T from Vishay General Semiconductor offer improved performance characteristics with lower forward voltage (0.92 V versus 1 V) and faster reverse recovery time (25 ns versus 50 ns). These parts maintain 50 V / 1 A ratings and DO-214AC (SMA) package compatibility. Operating temperature range is -55°C to 155°C and -55°C to 150°C respectively. Both are ROHS3 compliant and actively produced.
Alternative for Package-Constrained Applications:
The CGRA4001-G from Comchip Technology maintains DO-214AC (SMA) package compatibility with identical 50 V / 1 A ratings. Forward voltage is specified at 1.1 V (0.1 V higher than US1A-13). Operating temperature range is -55°C to 150°C. This part is ROHS3 compliant and actively produced.
Legacy Support Only:
The ES1A-LTP and GS1A-LTP from Micro Commercial Co are marked "Not For New Designs" and should be used only for legacy system maintenance or repair. These parts carry ROHS3 compliance but are not recommended for new production.
Frequently Asked Questions (FAQ)
Q: Can US1A-13-F be used as a direct replacement for US1A-13 without PCB modification?
A: Yes. The US1A-13-F maintains identical electrical specifications and package configuration (DO-214AC SMA). No PCB layout changes are required.
Q: What is the difference between DO-214AC (SMA) and DO-214BA (GF1) packages?
A: Both are surface mount packages for rectifier diodes. DO-214AC (SMA) and DO-214BA (GF1) have different physical dimensions and land patterns. PCB footprint verification is required before substituting between these package types.
Q: Are the Vishay EGF1A-E3 series parts compatible with the US1A-13 application?
A: The EGF1A-E3/5CA and EGF1A-E3/67A maintain identical electrical performance (50 V, 1 A, 50 ns reverse recovery) but use DO-214BA (GF1) package instead of DO-214AC (SMA). PCB layout compatibility must be confirmed. Extended temperature range (-65°C to 175°C) provides additional margin.
Q: What is the advantage of ES1A-E3/5AT over US1A-13-F?
A: The ES1A-E3/5AT offers lower forward voltage (0.92 V versus 1 V) and faster reverse recovery time (25 ns versus 50 ns), reducing power dissipation and switching losses. Operating temperature minimum is -55°C (versus -65°C for US1A-13-F). Both maintain 50 V / 1 A ratings and DO-214AC (SMA) package compatibility.
Q: Why is CGRA4001-G listed as an alternative if forward voltage is higher?
A: The CGRA4001-G maintains 50 V / 1 A ratings and DO-214AC (SMA) package compatibility. Forward voltage of 1.1 V is within acceptable tolerance for general-purpose rectifier applications. This part is ROHS3 compliant and actively produced. Application-specific circuit analysis is required to confirm acceptability.
Q: Should ES1A-LTP or GS1A-LTP be used for new designs?
A: No. Both parts are marked "Not For New Designs" by their manufacturer. These parts are acceptable only for legacy system maintenance or repair where original part specifications must be maintained.
Q: What RoHS compliance status should be specified for new designs?
A: ROHS3 compliance is required for most regulated applications. US1A-13-F, EGF1A-E3/5CA, EGF1A-E3/67A, CGRA4001-G, ES1A-E3/5AT, and ES1A-E3/61T all carry ROHS3 certification. The original US1A-13 is RoHS non-compliant and should not be specified for new designs.
Q: Can multiple substitute parts be used interchangeably within a single production run?
A: Electrical interchangeability is confirmed for parts meeting the primary substitution criteria (50 V, 1 A, ≤50 ns reverse recovery time, ≤1 V forward voltage). However, package differences (DO-214AC versus DO-214BA) require separate PCB designs. Manufacturer qualification and process validation are required before mixing suppliers or package types in production.
Q: What is the minimum operating temperature for applications using CGRA4001-G?
A: The CGRA4001-G is rated for -55°C minimum junction temperature, compared to -65°C for US1A-13-F. Applications requiring operation below -55°C must use US1A-13-F, EGF1A-E3 series, or ES1A-LTP.
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