SB150-B Schottky Diode Equivalent & Substitute Parts

Part Overview

The SB150-B is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 50V DC reverse voltage and 1A 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 and procurement requirements. Equivalent substitutes must maintain electrical performance within the specified voltage, current, and thermal operating parameters while accommodating the through-hole axial package format.

Substiute Parts

SB150-B

Diodes IncorporatedIn Stock: 938SB150-B Datasheet

Current PartRFQ

1N5819-1

Microchip TechnologyIn Stock: 11191N5819-1 Datasheet

MFR RecommendedRFQ

DSB1A50

Microchip TechnologyIn Stock: 737DSB1A50 Datasheet

MFR RecommendedRFQ

MSG105

Microsemi CorporationIn Stock: 867MSG105 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SB150-B is determined by the following critical parameters:

Mandatory Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 50V or higher
• Current - Average Rectified (Io): 1A or higher
• Technology: Schottky
• Mounting Type: Through Hole
• Package / Case: DO-204AL, DO-41, or Axial equivalent

Performance Compatibility Criteria:

• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Forward Voltage (Vf): Must not exceed application requirements
• Reverse Leakage Current: Must not exceed application requirements
• Operating Temperature Range: Must encompass application operating conditions

The substitute parts identified below satisfy the mandatory matching criteria and maintain electrical performance within acceptable ranges for direct substitution in applications designed for the SB150-B.

Parameter Comparison

Engineering Selection Recommendations

DSB1A50 (Microchip Technology) and MSG105 (Microsemi Corporation) are the primary equivalents for the SB150-B. Both parts match the 50V reverse voltage rating and 1A current specification exactly, with forward voltage characteristics within acceptable operating ranges. DSB1A50 provides 600 mV forward voltage, while MSG105 provides 690 mV forward voltage, both lower than the SB150-B specification of 700 mV, indicating improved efficiency potential. MSG105 offers extended operating temperature range to 175°C, providing additional thermal margin for high-temperature applications.

1N5819-1 (Microchip Technology) is a secondary equivalent with a reduced 45V reverse voltage rating. This part is suitable only for applications where the circuit design operates at or below 45V reverse voltage. The 1N5819-1 exhibits significantly lower forward voltage (340 mV @ 1A) and reverse leakage current (50 µA @ 45V), indicating superior switching characteristics and lower power dissipation compared to the SB150-B.

All three substitute parts are active products with current manufacturing status and inventory availability. RoHS compliance status differs between the main part (RoHS3 Compliant) and all substitutes (RoHS non-compliant); design teams must evaluate regulatory requirements for their specific applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N5819-1 be used as a direct replacement for the SB150-B?

A: The 1N5819-1 is electrically compatible for applications operating at 45V reverse voltage or lower. The SB150-B is rated for 50V reverse voltage; therefore, 1N5819-1 substitution is restricted to circuits where the maximum reverse voltage does not exceed 45V. For circuits requiring the full 50V rating, DSB1A50 or MSG105 are required.

Q: What is the primary difference between DSB1A50 and MSG105?

A: Both parts meet the 50V and 1A specifications of the SB150-B. The primary difference is operating temperature range: DSB1A50 does not specify a temperature range, while MSG105 is rated to -65°C ~ 175°C. For applications requiring extended high-temperature operation, MSG105 is the preferred selection.

Q: Are all substitute parts available in the same DO-41 package as the SB150-B?

A: Yes. All three substitute parts (1N5819-1, DSB1A50, and MSG105) are available in DO-204AL, DO-41, and axial package configurations, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the SB150-B.

Q: How does forward voltage affect circuit performance?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. The SB150-B specifies 700 mV @ 1A. DSB1A50 (600 mV) and MSG105 (690 mV) exhibit lower forward voltage, resulting in reduced power dissipation and improved circuit efficiency. The 1N5819-1 (340 mV) provides the lowest forward voltage, offering maximum efficiency but only at 45V reverse voltage rating.

Q: What is the significance of reverse leakage current?

A: Reverse leakage current represents unwanted current flow when the diode is reverse-biased. The SB150-B specifies 500 µA @ 50V. Lower leakage current (DSB1A50 and MSG105 at 100 µA @ 50V, 1N5819-1 at 50 µA @ 45V) indicates better blocking characteristics and reduced standby power consumption, beneficial for low-power applications.

Q: Does RoHS compliance status affect substitution decisions?

A: RoHS compliance is a regulatory and procurement consideration, not an electrical performance factor. The SB150-B is RoHS3 Compliant, while all substitutes are RoHS non-compliant. Design teams must verify regulatory requirements for their target markets and supply chain policies before finalizing part selection.