SB540-B Schottky Diode Equivalent & Substitute Parts

Part Overview

The SB540-B is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 5 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design support and procurement. Substitute parts must maintain identical electrical performance characteristics and package compatibility to ensure direct replacement capability in existing circuit designs.

Substiute Parts

SB540-B

Diodes IncorporatedIn Stock: 1066SB540-B Datasheet

Current PartRFQ

SB540-T

Diodes IncorporatedIn Stock: 3878SB540-T Datasheet

Parametric EquivalentRFQ

SB540E-G

Comchip TechnologyIn Stock: 24577SB540E-G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SB540-B are qualified based on strict equivalence across the following critical parameters:

• Voltage Rating: DC reverse voltage of 40 V maximum
• Current Rating: Average rectified current of 5 A
• Forward Voltage Drop: 550 mV maximum at 5 A forward current
• Recovery Speed: Fast recovery characteristic with switching time ≤ 500 ns for currents > 200 mA
• Reverse Leakage: 500 µA maximum at 40 V reverse bias
• Package Type: DO-201AD axial through-hole configuration
• Operating Temperature Range: -65°C to 125°C junction temperature

All substitute parts listed maintain these electrical and mechanical specifications, enabling direct functional replacement in circuit applications. Differences in packaging format (Cut Tape versus other formats) and manufacturer do not affect electrical performance or board-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

SB540-T (Diodes Incorporated): This substitute maintains full electrical and mechanical equivalence to the SB540-B while offering active product status. As a Diodes Incorporated part, it represents a direct manufacturer continuation within the same product family. The SB540-T is supplied in Cut Tape packaging and carries ROHS3 compliance with REACH unaffected status, suitable for applications requiring regulatory documentation continuity.

SB540E-G (Comchip Technology): This alternative provides identical electrical specifications and DO-201AD package compatibility. The SB540E-G is available in higher inventory quantities and maintains ROHS3 compliance with REACH unaffected status. This part includes specified capacitance data (500 pF @ 4 V, 1 MHz), providing additional parametric documentation for applications requiring detailed frequency-dependent characteristics.

Both substitute parts are qualified for direct replacement based on electrical parameter equivalence, package compatibility, and regulatory compliance status. Selection between alternatives depends on procurement availability, supply chain preferences, and specific application requirements for capacitance documentation.

Frequently Asked Questions (FAQ)

Q: Can SB540-T or SB540E-G be used as direct replacements for SB540-B in existing designs?

A: Yes. Both substitute parts maintain identical electrical ratings (40 V, 5 A, 550 mV forward drop, fast recovery ≤ 500 ns) and use the same DO-201AD axial through-hole package. No circuit modifications are required for functional substitution.

Q: What is the difference between SB540-B and SB540-T?

A: The electrical specifications are identical. The primary difference is product status: SB540-B is obsolete while SB540-T is active. SB540-T is supplied in Cut Tape packaging format. Both are manufactured by Diodes Incorporated.

Q: Why is SB540E-G from Comchip Technology listed as an equivalent?

A: SB540E-G meets all critical electrical parameters: 40 V reverse voltage, 5 A current rating, 550 mV forward voltage drop, and fast recovery switching. The DO-201AD package ensures mechanical compatibility. Manufacturer differences do not affect circuit-level performance when specifications are identical.

Q: Are there packaging format differences between the substitute parts?

A: SB540-B packaging format is not specified in available data. SB540-T and SB540E-G are supplied in Cut Tape (CT) format. All three parts use the DO-201AD axial through-hole package, ensuring identical board-level mounting and lead geometry.

Q: What compliance certifications apply to these substitute parts?

A: All three parts are ROHS3 compliant and carry Moisture Sensitivity Level 1 (unlimited). SB540-T and SB540E-G are REACH unaffected. The original SB540-B is REACH affected. For applications requiring REACH compliance documentation, SB540-T or SB540E-G are appropriate selections.

Q: Is there a difference in reverse leakage current between the substitute parts?

A: No. All three parts specify 500 µA maximum reverse leakage current at 40 V reverse bias, ensuring identical leakage performance in circuit applications.

Q: Does the SB540E-G capacitance specification affect substitution suitability?

A: The SB540E-G provides specified capacitance data (500 pF @ 4 V, 1 MHz) while SB540-B and SB540-T do not list this parameter. This additional specification does not preclude substitution; it provides supplementary information for applications requiring frequency-dependent diode characteristics. The absence of capacitance data in SB540-B and SB540-T does not indicate performance differences.

Q: What is the operating temperature range for these diodes?

A: All three parts operate across a junction temperature range of -65°C to 125°C, supporting applications in industrial, automotive, and consumer temperature environments.