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1N4937-TP Equivalent & Substitute Parts
Part Overview
The 1N4937-TP is a general-purpose rectifier diode rated for 600 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and repair applications. Substitute parts maintain the same electrical ratings and mechanical form factor while offering active product status and enhanced performance characteristics.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) (Max) | 600 | V |
| Current - Average Rectified (Io) | 1 | A |
| Voltage - Forward (Vf) (Max) @ If | 1.3 V @ 1 A | V |
| Speed | Fast Recovery ≤ 500ns, > 200mA (Io) | — |
| Reverse Recovery Time (trr) | 200 | ns |
| Current - Reverse Leakage @ Vr | 5 µA @ 600 V | µA |
| Mounting Type | Through Hole | — |
| Package / Case | DO-204AL, DO-41, Axial | — |
| Operating Temperature - Junction | -55°C ~ 150°C | °C |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the 1N4937-TP are classified into three categories based on electrical and mechanical compatibility:
Direct Manufacturer Substitutes maintain identical base part specifications from Micro Commercial Co with active product status and improved forward voltage characteristics. These parts are pin-compatible and functionally interchangeable with the original 1N4937-TP.
Parametric Equivalents from Micro Commercial Co provide the same electrical ratings with variations in reverse recovery time and capacitance. These parts are suitable for applications where the specific recovery time characteristics do not impact circuit performance.
Cross-Manufacturer Alternatives from Vishay General Semiconductor and Comchip Technology meet all critical electrical parameters: 600 V reverse voltage, 1 A average rectified current, and through-hole DO-41 packaging. These parts are selected based on matching voltage, current, and thermal specifications.
Upgrade Options from Vishay General Semiconductor offer enhanced temperature operating range (-65°C ~ 175°C versus -55°C ~ 150°C) and active product status with SUPERECTIFIER® series designation, providing superior long-term availability and performance margin.
The key parameters determining substitution eligibility are:
- Voltage - DC Reverse (Vr) (Max): 600 V
- Current - Average Rectified (Io): 1 A
- Mounting Type: Through Hole
- Package / Case: DO-204AL, DO-41, Axial
- Operating Temperature Range compatibility
- RoHS3 Compliance
Parameter Comparison
| Part Number | Manufacturer | Product Status | Vr (Max) [V] | Io [A] | Vf (Max) @ 1A [V] | Speed | trr [ns] | Ir @ 600V [µA] | Tj Range [°C] | Packaging |
|---|---|---|---|---|---|---|---|---|---|---|
| 1N4937-TP | Micro Commercial Co | Obsolete | 600 | 1 | 1.3 | Fast Recovery ≤ 500ns | 200 | 5 | -55 ~ 150 | DO-41 |
| 1N4937GP-TP | Micro Commercial Co | Active | 600 | 1 | 1.2 | Fast Recovery ≤ 500ns | 200 | 5 | -55 ~ 150 | DO-41 |
| FR105GP-TP | Micro Commercial Co | Active | 600 | 1 | 1.3 | Fast Recovery ≤ 500ns | 250 | 5 | -55 ~ 150 | DO-41 |
| SF18G-TP | Micro Commercial Co | Active | 600 | 1 | 1.3 | Fast Recovery ≤ 500ns | 35 | 5 | -55 ~ 150 | DO-41 |
| 1N4005-E3/54 | Vishay General Semiconductor | Active | 600 | 1 | 1.1 | Standard Recovery >500ns | — | 5 | -55 ~ 150 | DO-204AL (DO-41) |
| 1N4005-G | Comchip Technology | Active | 600 | 1 | 1.1 | Standard Recovery >500ns | — | 5 | -55 ~ 150 | DO-41 |
| 1N4005E-E3/54 | Vishay General Semiconductor | Active | 600 | 1 | 1.1 | Standard Recovery >500ns | — | 5 | -55 ~ 150 | DO-204AL (DO-41) |
| 1N4005E-E3/73 | Vishay General Semiconductor | Active | 600 | 1 | 1.1 | Standard Recovery >500ns | — | 5 | -55 ~ 150 | DO-204AL (DO-41) |
| 1N4937GP-E3/54 | Vishay General Semiconductor | Active | 600 | 1 | 1.2 | Fast Recovery ≤ 500ns | 200 | 5 | -65 ~ 175 | DO-204AL (DO-41) |
| 1N4937GP-E3/73 | Vishay General Semiconductor | Active | 600 | 1 | 1.2 | Fast Recovery ≤ 500ns | 200 | 5 | -65 ~ 175 | DO-204AL (DO-41) |
| 1N4937GPE-E3/54 | Vishay General Semiconductor | Active | 600 | 1 | 1.2 | Fast Recovery ≤ 500ns | 200 | 5 | -65 ~ 175 | DO-204AL (DO-41) |
Engineering Selection Recommendations
Primary Recommendation: 1N4937GP-TP
The 1N4937GP-TP from Micro Commercial Co is the direct manufacturer substitute with active product status. This part maintains identical electrical specifications to the 1N4937-TP with improved forward voltage (1.2 V versus 1.3 V at 1 A), reducing power dissipation. The part is ROHS3 compliant and carries unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing processes.
Secondary Recommendation: 1N4937GP-E3/54 or 1N4937GP-E3/73
Vishay General Semiconductor's 1N4937GP series offers enhanced operating temperature range (-65°C ~ 175°C) compared to the original specification (-55°C ~ 150°C). These parts are designated as SUPERECTIFIER® series with active product status and 21,400 and 5,400 units in stock respectively. The extended temperature range provides additional design margin for applications subject to thermal stress. Both parts maintain 600 V reverse voltage, 1 A average rectified current, and 200 ns reverse recovery time.
Alternative for Standard Recovery Applications: 1N4005-E3/54 or 1N4005E-E3/54
For applications where fast recovery characteristics are not required, the 1N4005 series from Vishay General Semiconductor provides standard recovery operation (>500ns) with lower forward voltage (1.1 V at 1 A). These parts are suitable for general-purpose rectification in power supplies and bridge rectifier configurations. The 1N4005E-E3/54 variant has 21,925 units in stock, providing superior availability.
Performance-Enhanced Option: SF18G-TP
The SF18G-TP from Micro Commercial Co offers the fastest reverse recovery time (35 ns) among available substitutes, making it suitable for high-frequency switching applications. This part maintains all other electrical specifications and is ROHS3 compliant with active product status.
All recommended substitutes are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99, meeting regulatory requirements for commercial electronics applications.
Frequently Asked Questions (FAQ)
Q: Can the 1N4937-TP be directly replaced with the 1N4937GP-TP?
A: Yes. The 1N4937GP-TP is the direct manufacturer substitute from Micro Commercial Co with identical electrical ratings (600 V, 1 A, DO-41 package) and active product status. The forward voltage is improved at 1.2 V versus 1.3 V at 1 A, reducing power dissipation without affecting circuit functionality.
Q: What is the difference between fast recovery and standard recovery diodes?
A: Fast recovery diodes (≤500ns reverse recovery time) are designed for high-frequency switching applications where rapid turn-off is critical. Standard recovery diodes (>500ns) are suitable for low-frequency rectification in power supplies. The 1N4937-TP is specified as fast recovery. The 1N4005 series uses standard recovery technology.
Q: Are Vishay 1N4937GP-E3/54 and 1N4937GP-E3/73 interchangeable?
A: Yes. Both parts are electrically identical with the same 600 V, 1 A, 200 ns reverse recovery time specifications. The difference is packaging format: E3/54 is supplied in cut tape (CT), while E3/73 is supplied in cut tape format. Both are ROHS3 compliant and SUPERECTIFIER® series with extended temperature range (-65°C ~ 175°C).
Q: Can I use a 1N4005 diode instead of a 1N4937?
A: The 1N4005 is electrically compatible for voltage and current ratings (600 V, 1 A) and package type (DO-41). However, the 1N4005 uses standard recovery technology (>500ns) versus the 1N4937's fast recovery (≤500ns). Use 1N4005 only in applications where switching speed is not critical, such as low-frequency power supply rectification.
Q: What does ROHS3 compliance mean?
A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, restricting the use of specific hazardous materials including lead, mercury, cadmium, and certain flame retardants. All substitute parts listed are ROHS3 compliant.
Q: Why does the SF18G-TP have a much lower reverse recovery time (35 ns)?
A: The SF18G-TP uses advanced semiconductor technology optimized for ultra-fast switching applications. The 35 ns reverse recovery time is significantly faster than the 200 ns specification of the 1N4937-TP. This part is suitable for high-frequency power conversion circuits where rapid diode turn-off minimizes switching losses.
Q: What is the difference between DO-41 and DO-204AL packaging?
A: DO-41 and DO-204AL are equivalent designations for the same through-hole axial package. DO-204AL is the formal JEDEC designation, while DO-41 is the legacy designation. Both refer to a cylindrical component with axial leads suitable for through-hole PCB mounting.
Q: Are there inventory considerations when selecting a substitute?
A: Yes. The 1N4005E-E3/54 has the highest inventory (21,925 units), followed by 1N4937GP-E3/54 (21,400 units). The 1N4937GP-TP has 890 units in stock. For high-volume production, parts with larger inventory provide better lead time assurance.
Q: What is the operating temperature range difference between 1N4937-TP and 1N4937GP-E3/54?
A: The original 1N4937-TP operates from -55°C to 150°C junction temperature. The Vishay 1N4937GP-E3/54 extends this to -65°C to 175°C, providing 10°C additional margin at both temperature extremes. This extended range is beneficial for applications in harsh thermal environments.
Q: Can I mix different substitute parts in the same circuit?
A: All listed substitutes meet the same electrical specifications (600 V, 1 A, DO-41 package) and are therefore functionally interchangeable within a single circuit. However, mixing parts with different reverse recovery times (200 ns versus 35 ns) in the same circuit may introduce timing variations in high-frequency applications. For consistency, use the same part number throughout a design.
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