SS25 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS25 is a surface mount Schottky rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Equivalent and substitute parts are necessary to support existing designs, provide design flexibility, and ensure supply chain continuity for applications requiring Schottky rectification at this voltage and current rating.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	400	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65°C ~ 125°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS25 is determined by the following critical parameters:

Voltage Rating (Vr): The reverse voltage rating must equal or exceed 50 V. Parts with lower voltage ratings (40 V) are not suitable for direct substitution in circuits designed for 50 V operation.

Current Rating (Io): The average rectified current must equal or exceed 2 A. Parts rated for 1 A or 3 A represent different current classes and are not direct substitutes.

Forward Voltage (Vf): The forward voltage drop at rated current must be compatible with circuit design. The SS25 specifies 700 mV @ 2 A.

Package and Mounting: All substitute parts must use the DO-214AA (SMB) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Speed Characteristics: Fast recovery time (≤ 500ns, > 200mA) is required for rectification applications.

Temperature Range: Operating junction temperature range must support the application environment.

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts with identical electrical specifications (50 V, 2 A, 700 mV Vf, 400 µA reverse leakage) from different manufacturers. These are direct replacements.

Functional Substitutes: Parts with the same voltage and current ratings but from different manufacturers or with minor specification variations that remain within acceptable operating parameters for the application.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	Temp Range
SS25	onsemi	50 V	2 A	700 mV @ 2 A	400 µA @ 50 V	DO-214AA, SMB	Not For New Designs	-65°C ~ 125°C
SS25-E3/52T	Vishay General Semiconductor - Diodes Division	50 V	2 A	700 mV @ 2 A	400 µA @ 50 V	DO-214AA, SMB	Active	-65°C ~ 125°C
SS25-E3/5BT	Vishay General Semiconductor - Diodes Division	50 V	2 A	700 mV @ 2 A	400 µA @ 50 V	DO-214AA, SMB	Active	-65°C ~ 125°C
B250-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	500 µA @ 50 V	DO-214AA, SMB	Active	-65°C ~ 150°C
B250Q-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	500 µA @ 50 V	DO-214AA, SMB	Active	-65°C ~ 150°C
B350B-13-F	Diodes Incorporated	50 V	3 A	700 mV @ 3 A	500 µA @ 50 V	DO-214AA, SMB	Active	-55°C ~ 150°C
SK35B-LTP	Micro Commercial Co	50 V	3 A	750 mV @ 3 A	500 µA @ 50 V	DO-214AA, SMB	Not For New Designs	-55°C ~ 150°C
MBRS2040LT3G	onsemi	40 V	2 A	430 mV @ 2 A	800 µA @ 40 V	DO-214AA, SMB	Active	-55°C ~ 125°C
MBRS240LT3G	onsemi	40 V	2 A	430 mV @ 2 A	2 mA @ 40 V	DO-214AA, SMB	Active	-55°C ~ 150°C
B150B-13-F	Diodes Incorporated	50 V	1 A	700 mV @ 1 A	500 µA @ 50 V	DO-214AA, SMB	Active	-65°C ~ 150°C
B150BQ-13-F	Diodes Incorporated	50 V	1 A	700 mV @ 1 A	500 µA @ 50 V	DO-214AA, SMB	Active	-65°C ~ 150°C

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended for SS25 Replacement):

The Vishay General Semiconductor parts SS25-E3/52T and SS25-E3/5BT are parametric equivalents to the SS25. Both parts maintain identical electrical specifications: 50 V reverse voltage, 2 A average rectified current, 700 mV forward voltage at 2 A, and 400 µA reverse leakage at 50 V. Both are Active product status, ensuring long-term availability. These parts are the primary recommendation for direct substitution in existing SS25 designs.

Functional Substitutes with 50 V / 2 A Rating:

The Diodes Incorporated B250-13-F and B250Q-13-F are functionally equivalent to the SS25 with identical voltage and current ratings. Both maintain 700 mV forward voltage at 2 A and are rated for 50 V reverse voltage. These parts feature extended operating temperature ranges (-65°C ~ 150°C) compared to the SS25 (-65°C ~ 125°C). The B250Q-13-F includes AEC-Q101 automotive qualification. Both are Active product status.

Higher Current Alternatives (50 V / 3 A):

The Diodes Incorporated B350B-13-F and Micro Commercial Co SK35B-LTP are rated for 3 A average rectified current at 50 V. These parts provide higher current capacity than the SS25 and are suitable for applications requiring additional thermal margin or higher current handling. The B350B-13-F is Active product status. The SK35B-LTP is Not For New Designs but remains available for legacy support.

Lower Voltage Alternatives (40 V / 2 A):

The onsemi MBRS2040LT3G and MBRS240LT3G are rated for 40 V reverse voltage and 2 A average rectified current. These parts are not suitable for direct substitution in circuits designed for 50 V operation. Use only when the application circuit operates at 40 V or lower.

Lower Current Alternatives (50 V / 1 A):

The Diodes Incorporated B150B-13-F and B150BQ-13-F are rated for 1 A average rectified current at 50 V. These parts are not suitable for direct substitution in circuits requiring 2 A. The B150BQ-13-F includes AEC-Q101 automotive qualification.

Compliance and Certification:

All listed substitute parts are RoHS3 compliant and REACH unaffected. The B250Q-13-F and B150BQ-13-F carry AEC-Q101 automotive qualification for applications requiring automotive-grade components. All parts have Moisture Sensitivity Level 1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can I use MBRS2040LT3G or MBRS240LT3G as a direct replacement for SS25?

A: No. These parts are rated for 40 V maximum reverse voltage, while the SS25 is rated for 50 V. Direct substitution is not permitted in circuits designed for 50 V operation. Use these parts only in applications operating at 40 V or lower.

Q: What is the difference between SS25-E3/52T and SS25-E3/5BT?

A: Both parts are parametric equivalents to the SS25 with identical electrical specifications. The difference is in packaging designation: SS25-E3/52T uses standard Tape & Reel packaging, while SS25-E3/5BT uses an alternative tape configuration. Both are suitable for direct substitution.

Q: Can I use B350B-13-F instead of SS25?

A: B350B-13-F is rated for 3 A average rectified current, compared to the SS25 at 2 A. This part can be used in SS25 applications as a higher-current alternative, providing additional thermal margin. The 50 V reverse voltage rating and 700 mV forward voltage at rated current are compatible. Verify that the higher current rating does not introduce unintended circuit behavior.

Q: Are B250-13-F and B250Q-13-F interchangeable?

A: Both parts have identical electrical specifications and are rated for 50 V / 2 A. The B250Q-13-F includes AEC-Q101 automotive qualification, while B250-13-F does not. They are mechanically and electrically interchangeable. Select B250Q-13-F for automotive applications requiring AEC-Q101 certification.

Q: What is the significance of the "Not For New Designs" status on SS25 and SK35B-LTP?

A: "Not For New Designs" indicates the manufacturer has discontinued active development and recommends against using these parts in new product designs. However, these parts remain available for existing designs and legacy support. For new designs, select parts with "Active" product status such as SS25-E3/52T, B250-13-F, or B250Q-13-F.

Q: Do all substitute parts use the same DO-214AA (SMB) package?

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical compatibility with existing PCB layouts designed for the SS25.

Q: What is the difference in reverse leakage current between SS25 and B250-13-F?

A: The SS25 specifies 400 µA reverse leakage at 50 V, while B250-13-F specifies 500 µA at 50 V. This 100 µA difference is within acceptable tolerance for most rectification applications. Verify leakage specifications for applications with strict leakage requirements.

Q: Can I use B150B-13-F in an SS25 application?

A: No. B150B-13-F is rated for 1 A average rectified current, while the SS25 is rated for 2 A. This part cannot handle the full 2 A current of the SS25 application and is not a suitable substitute.

Q: What is the temperature range difference between SS25 and B250-13-F?

A: The SS25 operates from -65°C to 125°C junction temperature, while B250-13-F operates from -65°C to 150°C. The B250-13-F provides a 25°C higher maximum operating temperature, offering better thermal margin in high-temperature applications.

Q: Are there any compliance differences between the substitute parts?

A: All listed parts are RoHS3 compliant and REACH unaffected. The B250Q-13-F and B150BQ-13-F carry AEC-Q101 automotive qualification. All parts have Moisture Sensitivity Level 1 (Unlimited). Select AEC-Q101 qualified parts for automotive applications requiring this certification.

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