SB140-B Equivalent & Substitute Parts

Part Overview

The SB140-B is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical performance within the specified parameters while offering active product status and improved availability.

Substiute Parts

SB140-B

Diodes IncorporatedIn Stock: 1181SB140-B Datasheet

Current PartRFQ

DSB1A40

Microchip TechnologyIn Stock: 1162DSB1A40 Datasheet

MFR RecommendedRFQ

MSG104

Microsemi CorporationIn Stock: 1012MSG104 Datasheet

MFR RecommendedRFQ

SB140-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 10492SB140-E3/54 Datasheet

MFR RecommendedRFQ

SR104 A0G

Taiwan Semiconductor CorporationIn Stock: 10527SR104 A0G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SB140-B is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 1 A
• Technology: Schottky
• Mounting Type: Through Hole
• Package / Case: DO-204AL, DO-41, Axial
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Substitute parts may exceed the SB140-B specification of 500 mV @ 1 A, provided the value does not compromise circuit performance
• Current - Reverse Leakage @ Vr: Substitute parts may have lower leakage current than the SB140-B specification of 500 µA @ 40 V
• Operating Temperature - Junction: Substitute parts may have extended temperature ranges beyond the SB140-B specification of -65°C ~ 125°C

All identified substitute parts meet the mandatory equivalence criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

SB140-E3/54 (Vishay General Semiconductor - Diodes Division)

This part provides the closest electrical match to the SB140-B, with forward voltage of 480 mV @ 1 A, which is superior to the original specification of 500 mV @ 1 A. The SB140-E3/54 maintains identical reverse leakage current (500 µA @ 40 V) and operating temperature range (-65°C ~ 125°C). Product status is active with ROHS3 compliance, matching the original part's regulatory standing. Inventory availability is 10,400 pieces.

SR104 A0G (Taiwan Semiconductor Corporation)

This part meets all mandatory equivalence criteria with forward voltage of 550 mV @ 1 A and reverse leakage of 500 µA @ 40 V. Operating temperature range is -55°C ~ 125°C, providing a narrower lower bound than the SB140-B. Product status is active with ROHS3 compliance. Inventory availability is 10,505 pieces.

MSG104 (Microsemi Corporation)

This part satisfies all mandatory equivalence criteria with extended operating temperature range of -65°C ~ 175°C. Forward voltage is 690 mV @ 1 A and reverse leakage is 100 µA @ 40 V. Product status is active. RoHS compliance is non-compliant. Inventory availability is 968 pieces.

DSB1A40 (Microchip Technology)

This part meets all mandatory equivalence criteria with forward voltage of 600 mV @ 1 A and reverse leakage of 100 µA @ 40 V. Product status is active. RoHS compliance is non-compliant. Operating temperature range is not specified. Inventory availability is 1,065 pieces.

Frequently Asked Questions (FAQ)

Q: Can the SB140-B be directly replaced with any of these substitute parts?

A: Yes. All identified substitute parts maintain the critical electrical parameters: 40 V reverse voltage rating, 1 A average rectified current, Schottky technology, fast recovery speed, and through-hole DO-41 packaging. Direct substitution is electrically valid.

Q: What is the primary reason for substitution?

A: The SB140-B is classified as obsolete. The substitute parts listed are active products with current manufacturing status and improved availability.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage variations among substitute parts range from 480 mV to 690 mV @ 1 A, compared to the SB140-B specification of 500 mV @ 1 A. These differences are within typical Schottky diode performance tolerances and do not prevent functional substitution. Circuit designers must verify that forward voltage drop is acceptable for their specific application.

Q: Are there RoHS compliance considerations?

A: The SB140-B and two substitute parts (SB140-E3/54 and SR104 A0G) are ROHS3 compliant. Two substitute parts (DSB1A40 and MSG104) are RoHS non-compliant. Selection depends on regulatory requirements for the end application.

Q: What is the difference between DO-41 and DO-204AL packaging?

A: DO-41 and DO-204AL are equivalent designations for the same through-hole axial package. All substitute parts use this identical package format and are mechanically interchangeable with the SB140-B.

Q: Which substitute part has the lowest reverse leakage current?

A: Both DSB1A40 and MSG104 have reverse leakage current of 100 µA @ 40 V, compared to the SB140-B specification of 500 µA @ 40 V. The SB140-E3/54 and SR104 A0G maintain the original 500 µA @ 40 V specification.

Q: What is the operating temperature range consideration?

A: The SB140-B operates from -65°C to 125°C. The SR104 A0G has a lower bound of -55°C. The MSG104 extends to 175°C. Selection depends on the thermal environment of the application.