SF31GHA0G Equivalent & Substitute Parts

Part Overview

The SF31GHA0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical ratings, mechanical compatibility, and regulatory certifications align with the original specification, enabling direct replacement in circuit applications without design modification.

Substiute Parts

SF31GHA0G

Taiwan Semiconductor CorporationIn Stock: 1165SF31GHA0G Datasheet

Current PartRFQ

1N5400-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 23991N5400-E3/73 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SF31GHA0G is determined by matching the following critical electrical and mechanical parameters:

Voltage Rating: DC reverse voltage must equal or exceed 50 V maximum.

Current Rating: Average rectified current must equal or exceed 3 A.

Package Compatibility: Physical form factor must be DO-201AD axial through-hole to ensure mechanical fit and PCB compatibility without layout modification.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status must be maintained for supply chain and environmental requirements.

Operating Temperature Range: Junction temperature range must span -55°C to 150°C minimum to support automotive and industrial applications.

The substitute part 1N5400-E3/73 meets all critical substitution criteria: identical voltage and current ratings, matching DO-201AD package, equivalent temperature range, and aligned regulatory certifications. Differences in forward voltage, recovery speed, and capacitance do not preclude substitution when circuit design tolerances accommodate these variations.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SF31GHA0G remains the primary choice when fast recovery characteristics (35 ns trr) and lower forward voltage (950 mV @ 3 A) are circuit requirements. Active product status and AEC-Q101 automotive qualification support continued use in new designs and production environments.

Substitute Selection: 1N5400-E3/73 is a valid substitute when circuit design tolerances accommodate standard recovery speed (> 500 ns) and higher forward voltage (1.2 V @ 3 A). Both parts maintain equivalent voltage and current ratings, identical package form factor, matching temperature range, and aligned regulatory compliance (ROHS3, REACH unaffected). Active product status of the substitute ensures supply chain continuity.

Compliance Alignment: Both parts satisfy ROHS3 compliance and REACH unaffected requirements, supporting applications with environmental and regulatory constraints. Operating temperature range equivalence (-55°C to 150°C) ensures thermal performance parity across automotive and industrial temperature profiles.

Frequently Asked Questions (FAQ)

Q: Can 1N5400-E3/73 directly replace SF31GHA0G in all applications?

A: Direct replacement is possible when circuit design accommodates the parameter differences. The substitute part maintains equivalent voltage (50 V), current (3 A), package (DO-201AD), and temperature range (-55 to 150°C). However, the higher forward voltage (1.2 V versus 950 mV) and standard recovery speed (> 500 ns versus 35 ns fast recovery) may affect power dissipation and switching performance in specific circuit topologies. Circuit validation is required to confirm compatibility with application-specific performance requirements.

Q: Are the DO-201AD packages physically identical?

A: Yes. Both SF31GHA0G and 1N5400-E3/73 use DO-201AD axial through-hole packages. Physical dimensions, lead spacing, and PCB mounting footprints are identical, enabling direct mechanical substitution without layout modification.

Q: What is the significance of the forward voltage difference?

A: SF31GHA0G specifies 950 mV forward voltage at 3 A, while 1N5400-E3/73 specifies 1.2 V at 3 A. This 250 mV difference results in increased power dissipation in the substitute part. In high-current or continuous-duty applications, thermal management and circuit efficiency calculations must account for this variation.

Q: Why does recovery speed differ between these parts?

A: SF31GHA0G is classified as fast recovery (≤ 500 ns, trr = 35 ns), while 1N5400-E3/73 is standard recovery (> 500 ns). Fast recovery diodes exhibit lower reverse recovery time, reducing switching losses and enabling higher-frequency operation. Standard recovery diodes are suitable for lower-frequency rectification applications where recovery speed is not a limiting factor.

Q: Are both parts suitable for automotive applications?

A: SF31GHA0G carries AEC-Q101 automotive qualification. 1N5400-E3/73 does not specify AEC-Q101 qualification in the provided data. For automotive applications requiring AEC-Q101 certification, SF31GHA0G is the specified choice. The substitute may be acceptable for non-automotive or non-qualified applications.

Q: What is the difference in capacitance specifications?

A: SF31GHA0G specifies 80 pF at 4 V, 1 MHz, while 1N5400-E3/73 specifies 30 pF at the same conditions. Lower capacitance in the substitute part reduces junction capacitance effects, which may improve high-frequency performance but is typically not a limiting factor in standard rectification circuits.

Q: Are inventory levels a consideration for part selection?

A: Inventory availability is a supply chain factor. SF31GHA0G has 1136 pieces in stock, while 1N5400-E3/73 has 2300 pieces available. Substitute selection may be driven by inventory status when electrical and mechanical compatibility requirements are satisfied.