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UF4004 Equivalent & Substitute Parts
Part Overview
The UF4004 is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 1 A average rectified current in a through-hole DO-204AL (DO-41) axial package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as Active and complies with ROHS3 standards. The UF4004 features fast recovery characteristics with a reverse recovery time of 50 ns, making it suitable for applications requiring efficient switching performance in power supply and rectification circuits.
Substitute parts are necessary when the primary UF4004 becomes unavailable, when alternative manufacturers are required for supply chain diversification, or when specific certifications such as automotive qualification (AEC-Q101) are mandated for particular applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) (Max) | 400 | V |
| Current - Average Rectified (Io) | 1 | A |
| Voltage - Forward (Vf) (Max) @ If | 1 | V @ 1 A |
| Reverse Recovery Time (trr) | 50 | ns |
| Current - Reverse Leakage @ Vr | 5 | µA @ 400 V |
| Capacitance @ Vr, F | 17 | pF @ 4V, 1MHz |
| Mounting Type | Through Hole | |
| Package / Case | DO-204AL, DO-41, Axial | |
| Operating Temperature - Junction | -55 to 150 | °C |
| Speed Classification | Fast Recovery ≤ 500ns, > 200mA (Io) | |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the UF4004 are classified based on strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Voltage - DC Reverse (Vr) (Max): 400 V
- Current - Average Rectified (Io): 1 A
- Mounting Type: Through Hole
- Package / Case: DO-204AL, DO-41, or Axial equivalent
Secondary Compatibility Factors:
- Voltage - Forward (Vf) (Max) @ If: Acceptable range 1.0 V to 1.25 V @ 1 A
- Reverse Recovery Time (trr): Fast Recovery ≤ 500 ns or Standard Recovery > 500 ns
- Current - Reverse Leakage @ Vr: 5 µA to 200 nA @ 400 V
- Operating Temperature - Junction: Minimum -55°C, Maximum 150°C or higher
- RoHS Compliance: ROHS3 Compliant or Not Applicable
Substitute parts are grouped into three categories:
-
Direct Manufacturer Equivalents: Identical part numbers from alternative manufacturers with matching electrical specifications and package designations.
-
Parametric Equivalents: Parts with identical electrical ratings and package types but different part numbers, including automotive-qualified variants (AEC-Q101).
-
Similar Parts: Components with matching voltage and current ratings but variations in recovery speed classification, leakage current, or temperature range that remain functionally compatible within specified operating conditions.
Parameter Comparison
| Part Number | Manufacturer | Vr (Max) V | Io (A) | Vf (Max) @ If (V) | trr (ns) | Ir @ Vr (µA) | Package | Tj (°C) | Speed | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| UF4004 | Taiwan Semiconductor Corporation | 400 | 1 | 1 @ 1 A | 50 | 5 @ 400 V | DO-204AL (DO-41) | -55 to 150 | Fast Recovery ≤ 500ns | Active |
| UF4004 | Diotec Semiconductor | 400 | 1 | 1.25 @ 1 A | 50 | 5 @ 400 V | DO-41/DO-204AC | -50 to 175 | Fast Recovery ≤ 500ns | Active |
| UF1G | Taiwan Semiconductor Corporation | 400 | 1 | 1 @ 1 A | 50 | 5 @ 400 V | DO-204AL (DO-41) | -55 to 150 | Fast Recovery ≤ 500ns | Active |
| UF1GH | Taiwan Semiconductor Corporation | 400 | 1 | 1 @ 1 A | 50 | 5 @ 400 V | DO-204AL (DO-41) | -55 to 150 | Fast Recovery ≤ 500ns | Active |
| UF4004H | Taiwan Semiconductor Corporation | 400 | 1 | 1 @ 1 A | 50 | 5 @ 400 V | DO-204AL (DO-41) | -55 to 150 | Fast Recovery ≤ 500ns | Active |
| 1N4004G | Rectron USA | 400 | 1 | 1 @ 1 A | — | 0.2 @ 400 V | DO-41 | -65 to 175 | Standard Recovery > 500ns | Active |
| 1N4004RLG | onsemi | 400 | 1 | 1.1 @ 1 A | — | 10 @ 400 V | DO-204AL (DO-41) | -65 to 175 | Standard Recovery > 500ns | Not For New Designs |
| 1N4004-E3/53 | Vishay General Semiconductor - Diodes Division | 400 | 1 | 1.1 @ 1 A | — | 5 @ 400 V | DO-204AL (DO-41) | -50 to 150 | Standard Recovery > 500ns | Active |
| 1N4004-E3/54 | Vishay General Semiconductor - Diodes Division | 400 | 1 | 1.1 @ 1 A | — | 5 @ 400 V | DO-204AL (DO-41) | -55 to 150 | Standard Recovery > 500ns | Active |
| 1N4004-E3/73 | Vishay General Semiconductor - Diodes Division | 400 | 1 | 1.1 @ 1 A | — | 5 @ 400 V | DO-204AL (DO-41) | -55 to 150 | Standard Recovery > 500ns | Active |
Engineering Selection Recommendations
Direct Manufacturer Equivalents (Recommended for Direct Substitution):
The UF4004 from Diotec Semiconductor is a direct equivalent with identical part number designation. This part maintains the same voltage and current ratings with fast recovery characteristics. The forward voltage specification of 1.25 V @ 1 A is within acceptable tolerance for general-purpose rectification applications. Operating temperature range extends to 175°C, providing enhanced thermal margin in high-temperature environments.
The UF1G and UF1GH from Taiwan Semiconductor Corporation are parametric equivalents manufactured by the same supplier as the primary UF4004. These parts share identical electrical specifications, package designation, and fast recovery performance. The UF1GH variant includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade component certification.
The UF4004H from Taiwan Semiconductor Corporation is a parametric equivalent with AEC-Q101 automotive qualification. This part is recommended for applications subject to automotive standards or requiring automotive-grade component traceability.
Similar Parts (Compatible with Application Review):
The 1N4004-E3/53, 1N4004-E3/54, and 1N4004-E3/73 from Vishay General Semiconductor are similar parts with identical voltage and current ratings. These components feature standard recovery characteristics (> 500 ns) rather than fast recovery. The forward voltage specification of 1.1 V @ 1 A and reverse leakage current of 5 µA @ 400 V are compatible with the primary UF4004. These parts are suitable for applications where switching speed is not a critical performance factor.
The 1N4004G from Rectron USA is a similar part with standard recovery characteristics and significantly lower reverse leakage current (0.2 µA @ 400 V). This part includes AEC-Q101 automotive qualification and operates across an extended temperature range of -65°C to 175°C. Selection of this part is appropriate for automotive applications or environments requiring superior leakage current performance.
The 1N4004RLG from onsemi is marked as "Not For New Designs" and should be avoided for new circuit implementations. This part is retained in the substitute list for legacy system maintenance and repair applications only.
Compliance and Certification Considerations:
All recommended substitute parts maintain ROHS3 compliance or equivalent environmental standards. Parts designated with AEC-Q101 qualification (UF1GH, UF4004H, 1N4004G) are suitable for automotive applications. Selection should prioritize Active product status parts for new designs, with the exception of legacy system support where Not For New Designs parts may be necessary.
Frequently Asked Questions (FAQ)
Q: Can the UF4004 be replaced with the UF1G or UF1GH?
A: Yes. The UF1G and UF1GH are parametric equivalents manufactured by Taiwan Semiconductor Corporation with identical electrical specifications, package designation (DO-204AL/DO-41), and fast recovery performance (50 ns reverse recovery time). The UF1GH includes AEC-Q101 automotive qualification. Both parts are direct substitutes for the primary UF4004.
Q: What is the difference between fast recovery and standard recovery diodes in the substitute list?
A: The primary UF4004 and its parametric equivalents (UF1G, UF1GH, UF4004H) feature fast recovery characteristics with reverse recovery time of 50 ns (≤ 500 ns classification). Similar parts such as 1N4004-E3/53, 1N4004-E3/54, 1N4004-E3/73, and 1N4004G feature standard recovery characteristics (> 500 ns). Fast recovery diodes exhibit lower switching losses and are preferred in high-frequency switching applications. Standard recovery diodes are suitable for lower-frequency rectification applications where switching speed is not critical.
Q: Are the Vishay 1N4004-E3 series parts (1N4004-E3/53, 1N4004-E3/54, 1N4004-E3/73) interchangeable?
A: Yes, the 1N4004-E3/53, 1N4004-E3/54, and 1N4004-E3/73 are interchangeable from an electrical standpoint. All three variants share identical voltage (400 V), current (1 A), forward voltage (1.1 V @ 1 A), and reverse leakage (5 µA @ 400 V) specifications. The designations /53, /54, and /73 indicate different packaging or tape configurations (Cut Tape vs. Tape & Box). Selection between these variants depends on procurement and assembly requirements rather than electrical performance.
Q: Can the 1N4004RLG from onsemi be used as a substitute?
A: The 1N4004RLG meets the electrical requirements for voltage (400 V) and current (1 A) ratings. However, this part is designated as "Not For New Designs" by the manufacturer. Use of this part is restricted to legacy system maintenance and repair applications only. For new circuit implementations, select from parts with Active product status such as UF1G, UF1GH, UF4004H, or the Vishay 1N4004-E3 series.
Q: What is the significance of the AEC-Q101 qualification on UF1GH, UF4004H, and 1N4004G?
A: AEC-Q101 is an automotive electronics qualification standard. Parts bearing this certification have undergone rigorous testing for reliability and performance in automotive environments. Selection of AEC-Q101 qualified parts (UF1GH, UF4004H, 1N4004G) is mandatory for applications subject to automotive standards or where automotive-grade component traceability is required.
Q: Does the Diotec Semiconductor UF4004 have different performance characteristics than the Taiwan Semiconductor Corporation UF4004?
A: The Diotec Semiconductor UF4004 maintains the same voltage (400 V), current (1 A), and fast recovery characteristics (50 ns reverse recovery time) as the Taiwan Semiconductor Corporation UF4004. The forward voltage specification is slightly higher at 1.25 V @ 1 A compared to 1.0 V @ 1 A for the Taiwan Semiconductor version. The operating temperature range extends to 175°C versus 150°C for the Taiwan Semiconductor version. These differences are within acceptable tolerance for general-purpose rectification applications.
Q: What package compatibility considerations apply to these substitute parts?
A: All substitute parts listed are through-hole axial components compatible with DO-204AL (DO-41) package footprints. The Diotec Semiconductor UF4004 specifies DO-41/DO-204AC package designation, which is mechanically and electrically compatible with DO-204AL. Physical dimensions and lead spacing are standardized across these package designations, allowing direct board-level substitution without PCB redesign.
Q: Is the lower reverse leakage current (0.2 µA) of the 1N4004G from Rectron USA a significant advantage?
A: The 1N4004G exhibits reverse leakage current of 0.2 µA @ 400 V compared to 5 µA @ 400 V for the primary UF4004. This represents a 25-fold reduction in leakage current. The significance of this difference depends on application requirements. In high-impedance circuits or precision analog applications, lower leakage current provides performance benefits. In standard power supply and rectification applications, the difference is negligible. Selection should be based on specific circuit requirements rather than leakage current alone.
Q: Can substitute parts be mixed within a single circuit design?
A: Mixing substitute parts within a single circuit is not recommended. Consistent use of a single part number or qualified equivalent throughout a design ensures uniform electrical performance and simplifies procurement, inventory management, and troubleshooting. If multiple part sources are required for supply chain resilience, establish a formal qualification process and document approved substitutes in design specifications.
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