SS35 Schottky Diode Equivalent & Substitute Parts

Part Overview

The onsemi SS35 is a 50V, 3A Schottky rectifier diode in DO-214AB (SMC) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The SS35 is a fast recovery Schottky diode suitable for applications requiring low forward voltage drop and rapid switching characteristics in power conversion and rectification circuits.

Due to its discontinued status, equivalent and substitute parts from active manufacturers are necessary for ongoing production, maintenance, and new design implementations. Suitable alternatives maintain the same voltage and current ratings or provide enhanced specifications within compatible package configurations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	750 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 50 V	µA
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS35 is determined by the following critical parameters:

Voltage Rating (Vr): The reverse voltage must equal or exceed 50V. Parts rated below 50V are not suitable for direct substitution in circuits designed for the SS35 maximum voltage specification.

Current Rating (Io): The average rectified current must equal or exceed 3A. Parts rated below 3A cannot handle the specified load current.

Package Compatibility: All substitutes must use DO-214AB (SMC) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Technology: All substitutes are Schottky diodes, maintaining the fast recovery characteristic (≤ 500ns) and low forward voltage drop inherent to this technology.

Forward Voltage (Vf): Forward voltage drop at rated current should not significantly exceed the original specification (750 mV @ 3A) to avoid thermal management complications in power conversion applications.

Substitute parts are grouped into three categories:

Direct Equivalents: Identical voltage and current ratings (50V, 3A) from active manufacturers
Enhanced Current Rating: Same voltage (50V) with higher current capacity (5A), suitable for applications with current margin requirements
Lower Voltage Alternatives: Reduced voltage ratings (40V, 45V) with equal or higher current capacity, applicable only when circuit maximum voltage is confirmed below the substitute rating

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Package	Product Status	Temp Range
SS35	onsemi	50V	3A	750 mV @ 3A	DO-214AB, SMC	Not For New Designs	-55°C ~ 150°C
SS35-E3/57T	Vishay General Semiconductor	50V	3A	750 mV @ 3A	DO-214AB, SMC	Active	-55°C ~ 150°C
B350-13-F	Diodes Incorporated	50V	3A	700 mV @ 3A	DO-214AB, SMC	Active	-55°C ~ 125°C
B350Q-13-F	Diodes Incorporated	50V	3A	700 mV @ 3A	DO-214AB, SMC	Active	-55°C ~ 150°C
B550C-13-F	Diodes Incorporated	50V	5A	700 mV @ 5A	DO-214AB, SMC	Active	-55°C ~ 150°C
B550CQ-13-F	Diodes Incorporated	50V	5A	700 mV @ 5A	DO-214AB, SMC	Active	-55°C ~ 150°C
MBRS360T3G	onsemi	60V	3A	740 mV @ 3A	DO-214AB, SMC	Active	-65°C ~ 175°C
STPS340S	STMicroelectronics	40V	3A	630 mV @ 3A	DO-214AB, SMC	Active	-40°C ~ 150°C
STPS340SY	STMicroelectronics	40V	3A	630 mV @ 3A	DO-214AB, SMC	Active	-40°C ~ 150°C
SK645L-TP	Micro Commercial Co	45V	6A	650 mV @ 6A	DO-214AB, SMC	Active	-55°C ~ 150°C
SK64L-TP	Micro Commercial Co	40V	6A	650 mV @ 6A	DO-214AB, SMC	Not For New Designs	-55°C ~ 150°C

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

The SS35-E3/57T from Vishay General Semiconductor is the preferred direct equivalent. It maintains identical electrical specifications (50V, 3A, 750 mV @ 3A) and operating temperature range (-55°C ~ 150°C) as the original SS35. This part is in active production status and provides pin-for-pin compatibility with no circuit modifications required.

Secondary Recommendations - Same Voltage Rating:

The B350Q-13-F from Diodes Incorporated is an automotive-qualified alternative (AEC-Q101) with identical voltage and current ratings. It offers a slightly lower forward voltage (700 mV @ 3A) and extends the upper junction temperature to 150°C, matching the original specification. This part is suitable for applications requiring automotive-grade reliability.

The B350-13-F from Diodes Incorporated provides the same electrical performance as B350Q-13-F but without automotive qualification. It is suitable for commercial and industrial applications where AEC-Q101 certification is not required.

Enhanced Current Capacity Options:

The B550C-13-F and B550CQ-13-F from Diodes Incorporated maintain the 50V voltage rating while providing 5A current capacity. These parts are suitable for applications where additional current margin is beneficial. The B550CQ-13-F variant includes automotive qualification (AEC-Q101).

Higher Voltage Alternative:

The MBRS360T3G from onsemi provides 60V reverse voltage rating with identical 3A current capacity. This part is suitable for circuits where the maximum voltage specification is confirmed below 60V, offering enhanced voltage margin. It features an extended operating temperature range (-65°C ~ 175°C) and is in active production.

Lower Voltage Alternatives:

The STPS340S and STPS340SY from STMicroelectronics are rated for 40V reverse voltage with 3A current capacity. These parts are suitable only for applications where the circuit maximum voltage does not exceed 40V. The STPS340SY variant includes automotive qualification (AEC-Q101). Both parts feature lower forward voltage (630 mV @ 3A) compared to the original SS35.

The SK645L-TP from Micro Commercial Co provides 45V voltage rating with 6A current capacity. This part is applicable only when the circuit maximum voltage is confirmed below 45V.

Compliance Status:

All recommended active parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SS35 specifications.

Frequently Asked Questions (FAQ)

Q: Can the SS35-E3/57T be used as a direct replacement for the SS35?

A: Yes. The SS35-E3/57T from Vishay General Semiconductor is a direct equivalent with identical voltage (50V), current (3A), forward voltage (750 mV @ 3A), and operating temperature range (-55°C ~ 150°C). No circuit modifications are required.

Q: What is the difference between B350-13-F and B350Q-13-F?

A: Both parts have identical electrical specifications (50V, 3A, 700 mV @ 3A). The B350Q-13-F includes automotive qualification (AEC-Q101) and extends the upper junction temperature to 150°C, matching the original SS35. The B350-13-F is rated to 125°C maximum junction temperature. Select B350Q-13-F for automotive applications or when the full temperature range is required.

Q: Can I use the B550C-13-F in place of the SS35?

A: Yes, with design considerations. The B550C-13-F maintains the 50V voltage rating and operating temperature range (-55°C ~ 150°C) but provides 5A current capacity instead of 3A. This part is suitable for applications where additional current margin is beneficial. The forward voltage (700 mV @ 5A) is comparable to the original specification.

Q: Are the STPS340S and STPS340SY suitable replacements for the SS35?

A: These parts are suitable only if the circuit maximum voltage is confirmed below 40V. Both are rated for 40V reverse voltage, which is below the SS35 specification of 50V. They offer lower forward voltage (630 mV @ 3A) and identical current capacity (3A). The STPS340SY includes automotive qualification (AEC-Q101).

Q: What is the advantage of the MBRS360T3G over the SS35?

A: The MBRS360T3G provides 60V reverse voltage rating compared to the SS35 50V rating, offering enhanced voltage margin. It maintains identical 3A current capacity and features an extended operating temperature range (-65°C ~ 175°C). This part is suitable for applications where higher voltage headroom is beneficial.

Q: Can I use the SK645L-TP as a substitute?

A: The SK645L-TP is suitable only if the circuit maximum voltage is confirmed below 45V. It provides 45V reverse voltage rating with 6A current capacity and lower forward voltage (650 mV @ 6A). This part is not a direct replacement for 50V applications.

Q: What packaging options are available for substitutes?

A: All substitute parts listed use the DO-214AB (SMC) surface mount package, identical to the original SS35. This ensures mechanical and electrical compatibility with existing PCB layouts. Packaging variants (Cut Tape, Digi-Reel, Tape & Reel, Bulk) differ only in supply format and do not affect electrical performance or board-level compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SS35 specifications.

Q: Which substitute should I select for automotive applications?

A: For automotive applications, select parts with AEC-Q101 qualification: B350Q-13-F, B550CQ-13-F, or STPS340SY. These parts meet automotive reliability and qualification standards. The B350Q-13-F is the preferred automotive equivalent, maintaining identical electrical specifications to the original SS35.

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