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HER107G Equivalent & Substitute Parts
Part Overview
The HER107G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 800 V DC reverse voltage and 1 A average rectified current in a DO-204AL (DO-41) through-hole axial package. This component is classified as a fast recovery diode with a reverse recovery time of 75 nanoseconds, suitable for standard rectification applications requiring moderate switching speeds. The part is Active in product status and RoHS3 compliant. Equivalent and substitute parts are identified when alternative manufacturers offer diodes with matching or superior electrical characteristics within the same package form factor, enabling design flexibility, supply chain alternatives, and inventory optimization.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) Maximum | 800 | V |
| Current - Average Rectified (Io) | 1 | A |
| Voltage - Forward (Vf) Maximum @ If | 1.7 | V @ 1 A |
| Speed Classification | Fast Recovery ≤ 500ns, > 200mA (Io) | — |
| Reverse Recovery Time (trr) | 75 | ns |
| Current - Reverse Leakage @ Vr | 5 | µA @ 800 V |
| Mounting Type | Through Hole | — |
| Package / Case | DO-204AL, DO-41, Axial | — |
| Operating Temperature - Junction | -55 to 150 | °C |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the HER107G are classified based on strict electrical and mechanical compatibility criteria. All substitute diodes must satisfy the following mandatory parameters:
Primary Substitution Criteria:
- Voltage - DC Reverse (Vr) Maximum: 800 V (minimum requirement)
- Current - Average Rectified (Io): 1 A (minimum requirement)
- Mounting Type: Through Hole
- Package / Case: DO-204AL, DO-41, or Axial configuration
Secondary Compatibility Factors:
- Voltage - Forward (Vf) Maximum @ If: ≤ 1.7 V @ 1 A (direct equivalents) or lower (upgrades)
- Reverse Recovery Time (trr): ≤ 75 ns (fast recovery classification) or standard recovery (≥ 500 ns for standard recovery types)
- Current - Reverse Leakage @ Vr: ≤ 5 µA @ 800 V
- Operating Temperature Range: -55°C to 150°C minimum (or extended range)
- RoHS3 Compliance: Required for direct equivalents
Substitutes are grouped into three categories: Direct Equivalents (identical electrical and package specifications), Parametric Equivalents (matching core electrical parameters with minor variations in secondary characteristics), and Similar/Upgrade parts (meeting or exceeding electrical requirements with potential differences in recovery speed or temperature range).
Parameter Comparison
| Part Number | Manufacturer | Vr (Max) V | Io (A) | Vf (Max) @ 1A (V) | Speed Classification | trr (ns) | Ir @ Vr (µA) | Package | Temp Range (°C) | RoHS3 |
|---|---|---|---|---|---|---|---|---|---|---|
| HER107G | Taiwan Semiconductor Corporation | 800 | 1 | 1.7 | Fast Recovery ≤ 500ns | 75 | 5 @ 800V | DO-204AL (DO-41) | -55 to 150 | Yes |
| UF4006 | Fairchild Semiconductor | 800 | 1 | 1.7 | Fast Recovery ≤ 500ns | 75 | 5 @ 800V | DO-41 | -50 to 175 | — |
| UF1K | Taiwan Semiconductor Corporation | 800 | 1 | 1.7 | Fast Recovery ≤ 500ns | 75 | 5 @ 800V | DO-204AL (DO-41) | -55 to 150 | Yes |
| UF1KH | Taiwan Semiconductor Corporation | 800 | 1 | 1.7 | Fast Recovery ≤ 500ns | 75 | 5 @ 800V | DO-204AL (DO-41) | -55 to 150 | Yes |
| UF4006H | Taiwan Semiconductor Corporation | 800 | 1 | 1.7 | Fast Recovery ≤ 500ns | 75 | 5 @ 800V | DO-204AL (DO-41) | -55 to 150 | Yes |
| EGP10K | Fairchild Semiconductor | 800 | 1 | 1.7 | Fast Recovery ≤ 500ns | 75 | 5 @ 800V | DO-204AL (DO-41) | -65 to 150 | — |
| UF1006-T | Diodes Incorporated | 800 | 1 | 1.7 | Fast Recovery ≤ 500ns | 75 | 5 @ 800V | DO-41 | -65 to 150 | Yes |
| 1N4006-E3/54 | Vishay General Semiconductor - Diodes Division | 800 | 1 | 1.1 | Standard Recovery >500ns | — | 5 @ 800V | DO-204AL (DO-41) | -55 to 150 | Yes |
| 1N4006-E3/73 | Vishay General Semiconductor - Diodes Division | 800 | 1 | 1.1 | Standard Recovery >500ns | — | 5 @ 800V | DO-204AL (DO-41) | -55 to 150 | Yes |
| 1N4006-T | Diodes Incorporated | 800 | 1 | 1.0 | Standard Recovery >500ns | — | 5 @ 800V | DO-41 | -65 to 150 | Yes |
Engineering Selection Recommendations
Direct Equivalents (Identical Specifications): UF1K and UF1KH from Taiwan Semiconductor Corporation are parametric equivalents to HER107G, offering identical electrical characteristics (800 V, 1 A, 75 ns recovery time, 1.7 V forward voltage) in the same DO-204AL package. Both are RoHS3 compliant and operate across the same temperature range (-55°C to 150°C). UF1KH includes AEC-Q101 automotive qualification, making it suitable for automotive applications requiring enhanced reliability screening. Selection between UF1K and UF1KH depends on application grade requirements.
Parametric Equivalents with Extended Temperature Range: UF4006 (Fairchild Semiconductor) and EGP10K (Fairchild Semiconductor) provide identical electrical performance to HER107G with extended upper operating temperature limits (175°C and 150°C respectively). EGP10K extends the lower temperature limit to -65°C. These parts are suitable for applications requiring wider thermal operating windows. UF4006 is supplied in DO-41 package; EGP10K is supplied in DO-204AL (DO-41) package.
Upgrade Parts with Enhanced Forward Voltage Performance: UF1006-T (Diodes Incorporated) and 1N4006 variants (Vishay General Semiconductor - Diodes Division) meet the 800 V, 1 A core requirements with lower forward voltage characteristics (1.7 V, 1.1 V, and 1.0 V respectively). These parts reduce power dissipation in rectification circuits. 1N4006 variants employ standard recovery technology (>500 ns), suitable for lower-frequency applications where fast recovery is not required. UF1006-T maintains fast recovery performance (75 ns) with RoHS3 compliance and extended temperature range (-65°C to 150°C).
Product Status Considerations: 1N4006-T is designated Last Time Buy, indicating discontinued production. This part remains available in current inventory (4,552 pcs) but should not be selected for new designs requiring long-term supply assurance.
Compliance and Certification: All recommended direct equivalents and upgrades maintain RoHS3 compliance and REACH unaffected status. UF1KH and UF4006H carry AEC-Q101 automotive qualification for applications requiring automotive-grade component screening and reliability documentation.
Frequently Asked Questions (FAQ)
Q: Can HER107G be directly replaced with UF1K or UF1KH? A: Yes. UF1K and UF1KH are parametric equivalents with identical electrical specifications (800 V, 1 A, 75 ns recovery time, 1.7 V forward voltage) and the same DO-204AL package. Both are RoHS3 compliant and operate within the same temperature range. UF1KH includes AEC-Q101 automotive qualification if required by application specifications.
Q: What is the difference between fast recovery and standard recovery diodes in this product category? A: Fast recovery diodes (HER107G, UF1K, UF1KH, UF4006, UF1006-T) have reverse recovery times ≤ 500 ns, enabling operation at higher switching frequencies with reduced switching losses. Standard recovery diodes (1N4006 variants) have reverse recovery times > 500 ns, suitable for lower-frequency rectification where fast switching is not required. Standard recovery diodes typically exhibit lower forward voltage drop (1.0–1.1 V versus 1.7 V).
Q: Are there inventory or packaging differences between substitute parts? A: Yes. HER107G is supplied in Cut Tape (CT) packaging with 5,655 pcs in stock. UF1K and UF1KH are also Cut Tape with higher inventory (22,200 and 5,723 pcs respectively). UF1006-T is supplied in Tape & Reel (TR) with 1,600 pcs. 1N4006 variants are Cut Tape with 4,552–9,002 pcs. EGP10K is supplied in Bulk with 28,335 pcs. Packaging selection depends on assembly process requirements and volume needs.
Q: Can HER107G be replaced with 1N4006 variants in all applications? A: 1N4006 variants meet the 800 V, 1 A core electrical requirements but employ standard recovery technology (>500 ns) instead of fast recovery (75 ns). This substitution is valid for low-frequency rectification circuits where switching speed is not critical. Applications requiring fast switching or operating at frequencies above 100 kHz should retain fast recovery diodes (HER107G, UF1K, UF1KH, UF4006, or UF1006-T).
Q: What is the significance of AEC-Q101 qualification on UF1KH and UF4006H? A: AEC-Q101 is an automotive industry standard qualification requiring enhanced reliability screening, including temperature cycling, thermal shock, and extended burn-in testing. Parts carrying this qualification are suitable for automotive and high-reliability applications where component failure rates must be minimized. Non-automotive applications do not require this certification.
Q: Is RoHS3 compliance mandatory for all substitute selections? A: RoHS3 compliance is mandatory for new designs and applications subject to European Union Restriction of Hazardous Substances regulations. All recommended direct equivalents and upgrades (UF1K, UF1KH, UF4006H, UF1006-T, and 1N4006 variants) are RoHS3 compliant. Fairchild Semiconductor parts (UF4006, EGP10K) do not specify RoHS3 status and should be verified with the supplier for regulatory compliance requirements.
Q: What is the impact of forward voltage differences on circuit performance? A: Forward voltage (Vf) directly affects power dissipation in rectification circuits. HER107G and equivalent parts operate at 1.7 V forward voltage, while 1N4006 variants operate at 1.0–1.1 V. Lower forward voltage reduces heat generation and improves efficiency, particularly in high-current or continuous-duty applications. The selection depends on thermal management requirements and acceptable power loss budgets.
Q: Can parts with extended temperature ranges (-65°C to 150°C) be used in place of standard range parts (-55°C to 150°C)? A: Yes. Extended temperature range parts (UF1006-T, 1N4006-T, EGP10K) are backward compatible with standard temperature range applications. Extended range capability provides design margin for extreme environmental conditions and is suitable for industrial, automotive, and aerospace applications. Standard range parts are adequate for commercial and consumer applications operating within -55°C to 150°C limits.
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