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SF18GH Equivalent & Substitute Parts
Part Overview
The SF18GH is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 600 V DC reverse voltage and 1 A average rectified current in a through-hole DO-204AL (DO-41) axial package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and operational specifications to support component procurement flexibility and supply chain continuity.
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 | 1.7 @ 1 A | V |
| Speed Classification | Fast Recovery ≤ 500ns, > 200mA (Io) | - |
| Reverse Recovery Time (trr) | 35 | ns |
| Current - Reverse Leakage @ Vr | 5 µA @ 600 V | µA |
| Capacitance @ Vr, F | 10 @ 4V, 1MHz | pF |
| Mounting Type | Through Hole | - |
| Package / Case | DO-204AL, DO-41, Axial | - |
| Operating Temperature - Junction | -55 to 150 | °C |
| Grade | Automotive | - |
| Qualification | AEC-Q101 | - |
| RoHS Status | ROHS3 Compliant | - |
Substitute Part Grouping Explanation
Substitute parts for the SF18GH are classified into two categories based on electrical and mechanical parameter alignment:
Parametric Equivalents share all critical electrical specifications: 600 V reverse voltage, 1 A average rectified current, 1.7 V maximum forward voltage at 1 A, fast recovery speed classification (≤ 500ns), 5 µA reverse leakage at 600 V, and through-hole axial mounting in DO-204AL or DO-41 packages. Variations in reverse recovery time (trr), capacitance, operating temperature range, and manufacturer do not disqualify parts from this category when all primary electrical ratings and package form factors remain compatible.
Similar Parts maintain the same voltage and current ratings with compatible through-hole axial packaging but differ in recovery speed classification (standard recovery >500ns instead of fast recovery) or forward voltage characteristics. These parts function in equivalent circuit roles but exhibit different switching performance.
Substitution logic is based strictly on:
- Voltage - DC Reverse (Vr) (Max): 600 V
- Current - Average Rectified (Io): 1 A
- Voltage - Forward (Vf) (Max) @ If: 1.7 V @ 1 A
- Mounting Type: Through Hole
- Package / Case: DO-204AL, DO-41, Axial
Parameter Comparison
| Part Number | Manufacturer | Vr (Max) [V] | Io [A] | Vf (Max) @ If [V] | Speed | trr [ns] | Ir @ Vr [µA] | Package | Mounting | Temp Range [°C] | Grade | Qualification |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SF18GH | Taiwan Semiconductor Corporation | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 35 | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -55 to 150 | Automotive | AEC-Q101 |
| HER106G | Taiwan Semiconductor Corporation | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 75 | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -55 to 150 | - | - |
| HER106G A0G | Taiwan Semiconductor Corporation | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 75 | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -55 to 150 | - | - |
| SF18G | SMC Diode Solutions | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 35 | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -65 to 150 | - | - |
| SF18G A0G | Taiwan Semiconductor Corporation | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 35 | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -55 to 150 | - | - |
| UF1J | HY Electronic (Cayman) Limited | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 75 | 5 @ 600 V | DO-214AC, SMA | Surface Mount | -55 to 150 | Automotive | AEC-Q100 |
| UF1JH | Taiwan Semiconductor Corporation | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 75 | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -55 to 150 | Automotive | AEC-Q101 |
| UF4005 | Fairchild Semiconductor | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 75 | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -50 to 175 | - | - |
| UF4005H | Taiwan Semiconductor Corporation | 600 | 1 | 1.7 @ 1 A | Fast Recovery ≤ 500ns | 75 | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -55 to 150 | Automotive | AEC-Q101 |
| 1N4005-G | Comchip Technology | 600 | 1 | 1.1 @ 1 A | Standard Recovery >500ns | - | 5 @ 600 V | DO-204AL, DO-41 | Through Hole | -55 to 150 | - | - |
Engineering Selection Recommendations
Direct Parametric Equivalents (Recommended for Direct Substitution)
SF18G A0G, HER106G, HER106G A0G, UF1JH, UF4005H, and UF4005 are parametric equivalents that maintain all critical electrical specifications matching the SF18GH: 600 V reverse voltage, 1 A average rectified current, 1.7 V forward voltage at 1 A, fast recovery speed classification, and through-hole axial DO-204AL or DO-41 packaging. These parts are suitable for direct substitution in applications where the SF18GH is specified.
SF18G (SMC Diode Solutions) provides identical electrical performance with extended lower operating temperature range (-65°C to 150°C) compared to the SF18GH (-55°C to 150°C), offering enhanced performance margin in low-temperature environments.
UF1JH and UF4005H are manufactured by Taiwan Semiconductor Corporation with AEC-Q101 automotive qualification matching the SF18GH grade classification, ensuring compliance with automotive reliability standards.
Surface Mount Alternative
UF1J (HY Electronic) provides equivalent electrical specifications in a surface-mount SMA package (DO-214AC) instead of through-hole axial configuration. This part is suitable only for applications where surface-mount technology is employed and board layout accommodates SMA package dimensions. UF1J carries AEC-Q100 automotive qualification (surface-mount equivalent to AEC-Q101).
Similar Part with Performance Variation
1N4005-G (Comchip Technology) maintains 600 V reverse voltage and 1 A current rating with through-hole axial packaging but differs in two critical parameters: forward voltage is 1.1 V at 1 A (lower than SF18GH specification of 1.7 V) and recovery speed is standard (>500ns) rather than fast recovery (≤500ns). This part is classified as similar rather than equivalent and is suitable only for applications where slower switching speed and lower forward voltage drop are acceptable or beneficial.
Compliance and Certification Considerations
All parametric equivalent parts maintain ROHS3 compliance and EAR99 export classification matching the SF18GH. Parts manufactured by Taiwan Semiconductor Corporation (SF18G A0G, UF1JH, UF4005H) carry AEC-Q101 automotive qualification identical to the SF18GH. HER106G and HER106G A0G do not specify automotive grade or qualification in provided data. 1N4005-G carries ROHS3 compliance but does not specify automotive qualification.
Frequently Asked Questions (FAQ)
Q: Can HER106G be used as a direct replacement for SF18GH?
A: HER106G is a parametric equivalent with matching 600 V reverse voltage, 1 A current rating, 1.7 V forward voltage at 1 A, fast recovery speed classification, and through-hole DO-204AL/DO-41 axial packaging. The primary difference is reverse recovery time (trr): HER106G specifies 75 ns compared to SF18GH at 35 ns. This longer recovery time does not disqualify substitution in most applications but may affect switching performance in high-frequency circuits. Automotive grade and AEC-Q101 qualification are not specified for HER106G in provided data.
Q: What is the difference between SF18G and SF18G A0G?
A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications: 600 V reverse voltage, 1 A current, 1.7 V forward voltage at 1 A, 35 ns reverse recovery time, and fast recovery speed classification. SF18G A0G includes the A0G suffix designation and specifies ROHS3 compliance and AEC-Q101 automotive qualification. SF18G (SMC Diode Solutions variant) extends the lower operating temperature to -65°C compared to -55°C for SF18G A0G. Both are suitable for direct substitution.
Q: Why is UF1J listed as a parametric equivalent when it uses surface-mount packaging?
A: UF1J maintains all critical electrical specifications (600 V, 1 A, 1.7 V forward voltage, fast recovery speed) and reverse leakage current matching the SF18GH. However, UF1J uses surface-mount SMA packaging (DO-214AC) instead of through-hole axial DO-204AL/DO-41. Substitution is possible only in applications designed for surface-mount technology. This part is not suitable for through-hole board designs without significant rework.
Q: Can 1N4005-G replace SF18GH in all applications?
A: 1N4005-G is classified as a similar part rather than a parametric equivalent due to two parameter differences: forward voltage is 1.1 V at 1 A (versus 1.7 V for SF18GH) and recovery speed is standard (>500ns) rather than fast recovery (≤500ns). Substitution is application-dependent. Lower forward voltage reduces power dissipation, which may be beneficial. Slower recovery speed may cause issues in high-frequency switching circuits. Automotive qualification is not specified for 1N4005-G.
Q: What does AEC-Q101 qualification mean for automotive applications?
A: AEC-Q101 is an automotive electronics council qualification standard for discrete semiconductors. Parts carrying this qualification have undergone specified reliability testing and environmental stress screening suitable for automotive use. SF18GH, SF18G A0G, UF1JH, and UF4005H carry AEC-Q101 qualification. HER106G and 1N4005-G do not specify this qualification in provided data. For automotive applications requiring AEC-Q101 compliance, use only qualified parts.
Q: Are all substitute parts ROHS3 compliant?
A: SF18GH, HER106G, HER106G A0G, SF18G A0G, UF1JH, UF4005H, and 1N4005-G are specified as ROHS3 compliant. SF18G (SMC Diode Solutions) and UF4005 (Fairchild Semiconductor) do not specify RoHS status in provided data. UF1J specifies RoHS Compliant without specific version designation. Verify RoHS compliance status with manufacturer documentation for parts not explicitly marked ROHS3 if compliance is required.
Q: What is the significance of reverse recovery time (trr) differences?
A: Reverse recovery time is the interval required for a diode to stop conducting after the applied voltage reverses. SF18GH specifies 35 ns (fast recovery), while HER106G, UF1JH, UF4005, and UF4005H specify 75 ns. Shorter recovery time reduces switching losses and is preferred in high-frequency applications. Longer recovery time may cause increased switching noise and power dissipation. For applications operating above 100 kHz, verify that the longer trr of substitute parts does not degrade circuit performance.
Q: Can SF18G (SMC Diode Solutions) be used in applications requiring -55°C minimum operating temperature?
A: SF18G specifies operating temperature range of -65°C to 150°C, which extends below the -55°C to 150°C range of SF18GH. SF18G is suitable for applications requiring operation at -55°C and below. This extended temperature range provides additional performance margin in low-temperature environments.
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