SB20150 Equivalent & Substitute Parts

Part Overview

The SB20150 is an active Schottky rectifier diode manufactured by SMC Diode Solutions, rated for 150V DC reverse voltage with 20A average rectified current in a through-hole DO-201AD axial package. This component is designed for high-current rectification applications requiring fast recovery characteristics. Equivalent and substitute parts are identified when electrical parameters and mechanical compatibility align within acceptable operating ranges for the intended application circuit.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	150	V
Current - Average Rectified (Io)	20	A
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 20 A	V
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 150 V
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-50 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SB20150 is determined by the following critical parameters:

Voltage Compatibility: The substitute part must maintain the same maximum DC reverse voltage rating (150V) to ensure safe operation within the circuit's voltage stress limits.

Package and Mounting: The substitute must use the identical DO-201AD axial through-hole package to ensure mechanical fit and PCB compatibility without redesign.

Technology Type: Both parts must employ Schottky diode technology to maintain consistent forward voltage characteristics and fast recovery behavior.

Current Rating: The substitute's average rectified current rating must equal or exceed the application requirement. The SB20150 is rated for 20A; substitutes with lower current ratings (such as 3A) are not interchangeable for this specific part number.

Recovery Speed: Fast recovery characteristics (≤ 500ns, > 200mA) must be maintained to preserve switching performance in the target circuit.

Regulatory Compliance: Both parts must meet ROHS3 compliance and maintain equivalent environmental certifications.

Based on these criteria, the STPS3150RL does not qualify as a direct substitute for the SB20150 due to its significantly lower current rating (3A versus 20A).

Parameter Comparison

Parameter	SB20150 (Main Part)	STPS3150RL (Substitute)	Match Status
Manufacturer	SMC Diode Solutions	STMicroelectronics	Different Manufacturer
Voltage - DC Reverse (Vr) (Max)	150 V	150 V	Compatible
Current - Average Rectified (Io)	20 A	3 A	Not Compatible
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 20 A	820 mV @ 3 A	Different Operating Point
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	≤ 500ns, > 200mA (Io)	Compatible
Current - Reverse Leakage @ Vr	1 mA @ 150 V	2 µA @ 150 V	Different Leakage Characteristics
Package / Case	DO-201AD, Axial	DO-201AD, Axial	Compatible
Mounting Type	Through Hole	Through Hole	Compatible
Operating Temperature - Junction	-50 to 150 °C	Max 175 °C	Compatible Range
Technology	Schottky	Schottky	Compatible
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Compatible

Engineering Selection Recommendations

The STPS3150RL shares identical voltage rating, package form factor, and technology classification with the SB20150. Both components are ROHS3 compliant and maintain fast recovery characteristics within the specified speed range.

However, the STPS3150RL current rating of 3A is substantially lower than the SB20150's 20A specification. This difference represents a fundamental incompatibility for applications requiring the full 20A rectified current capacity. Selection of the STPS3150RL for a circuit designed around the SB20150's 20A rating will result in component thermal stress and potential failure.

The STPS3150RL is suitable only for applications with maximum current requirements of 3A or less. For circuits requiring 20A rectification at 150V, the SB20150 remains the appropriate selection, or alternative 150V Schottky diodes with equivalent or higher current ratings in the DO-201AD package must be sourced.

Frequently Asked Questions (FAQ)

Q: Can the STPS3150RL replace the SB20150 in my circuit?

A: No. The STPS3150RL is rated for 3A average rectified current, while the SB20150 is rated for 20A. Direct substitution will cause the STPS3150RL to exceed its current rating and fail. Substitution is only valid when the application current requirement does not exceed 3A.

Q: Are the packages identical?

A: Yes. Both the SB20150 and STPS3150RL use the DO-201AD axial through-hole package. Mechanical fit and PCB mounting are compatible.

Q: Do both parts have the same voltage rating?

A: Yes. Both components are rated for 150V maximum DC reverse voltage and are suitable for identical voltage-class applications.

Q: What is the primary difference between these two diodes?

A: The primary difference is current capacity. The SB20150 handles 20A average rectified current, while the STPS3150RL handles 3A. This makes them suitable for different power levels despite sharing the same voltage rating and package.

Q: Are both parts RoHS compliant?

A: Yes. Both the SB20150 and STPS3150RL are ROHS3 compliant and meet current environmental regulations.

Q: Can I use the SB20150 in place of the STPS3150RL?

A: Yes. The SB20150 can be used in applications designed for the STPS3150RL, as it provides higher current capacity. However, this substitution may not be cost-effective for low-current applications.

Q: What is the recovery speed specification for both parts?

A: Both diodes feature fast recovery characteristics with switching times ≤ 500ns for currents greater than 200mA, making them suitable for high-frequency rectification circuits.

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