SS35HR7G Equivalent & Substitute Parts

Part Overview

The SS35HR7G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. The device features fast recovery characteristics with reverse recovery time ≤ 500 ns and is qualified to AEC-Q101 automotive standards with operating temperature range of -55°C to 150°C.

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)	—
Current - Reverse Leakage @ Vr	500	µA @ 50 V
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS35HR7G is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Voltage - Forward (Vf) (Max) @ If: Must not exceed 750 mV @ 3 A for standard technology; Schottky variants may operate at lower forward voltage
Speed: Must support fast recovery ≤ 500 ns for > 200 mA (Io)
Current - Reverse Leakage @ Vr: Must not exceed 500 µA @ 50 V

Mechanical Compatibility Requirements:

Package / Case: DO-214AB (SMC) or equivalent surface mount package
Mounting Type: Surface Mount

Compliance Requirements:

Grade: Automotive preferred for applications requiring AEC-Q101 qualification
Qualification: AEC-Q101 preferred
Operating Temperature - Junction: Must support -55°C to 150°C range or equivalent
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category 1: Direct Electrical & Package Equivalents (DO-214AB SMC) Parts with identical 50 V / 3 A ratings in DO-214AB SMC package. These include Schottky technology variants (B350Q-13-F) and standard technology variants (CSFC301-G, CURC301-G, ES3A).

Category 2: Higher Current Capability (DO-214AB SMC) Parts rated for 50 V / 5 A in DO-214AB SMC package (B550C-13-F, B550CQ-13-F, CGRC501-G). These provide increased current margin while maintaining package compatibility.

Category 3: Alternative Package Formats Parts with identical electrical ratings but different surface mount packages (B350-13-F in SMC, B350A-13-F in SMA, B350B-13-F in SMB). These are suitable only when package footprint changes are acceptable.

Parameter Comparison

Part Number	Manufacturer	Technology	Vr (Max)	Io	Vf (Max) @ If	Speed	Package	Grade	AEC-Q101	Temp Range	Product Status
SS35HR7G	Taiwan Semiconductor	Standard	50 V	3 A	750 mV @ 3 A	Fast ≤ 500ns	DO-214AB (SMC)	Automotive	Yes	-55 to 150°C	Discontinued
B350Q-13-F	Diodes Incorporated	Schottky	50 V	3 A	700 mV @ 3 A	Fast ≤ 500ns	DO-214AB (SMC)	Automotive	Yes	-55 to 150°C	Active
B350-13-F	Diodes Incorporated	Schottky	50 V	3 A	700 mV @ 3 A	Fast ≤ 500ns	DO-214AB (SMC)	—	—	-55 to 125°C	Active
B350A-13-F	Diodes Incorporated	Schottky	50 V	3 A	700 mV @ 3 A	Fast ≤ 500ns	DO-214AC (SMA)	Automotive	Yes	-55 to 150°C	Active
B350B-13-F	Diodes Incorporated	Schottky	50 V	3 A	700 mV @ 3 A	Fast ≤ 500ns	DO-214AA (SMB)	—	—	-55 to 150°C	Active
B550C-13-F	Diodes Incorporated	Schottky	50 V	5 A	700 mV @ 5 A	Fast ≤ 500ns	DO-214AB (SMC)	—	—	-55 to 150°C	Active
B550CQ-13-F	Diodes Incorporated	Schottky	50 V	5 A	700 mV @ 5 A	Fast ≤ 500ns	DO-214AB (SMC)	Automotive	Yes	-55 to 150°C	Active
CGRC501-G	Comchip Technology	Standard	50 V	5 A	1.15 V @ 5 A	Standard > 500ns	DO-214AB (SMC)	—	—	—	Active
CSFC301-G	Comchip Technology	Standard	50 V	3 A	950 mV @ 3 A	Fast ≤ 500ns	DO-214AB (SMC)	—	—	—	Active
CURC301-G	Comchip Technology	Standard	50 V	3 A	1 V @ 3 A	Fast ≤ 500ns	DO-214AB (SMC)	—	—	—	Active
ES3A	Taiwan Semiconductor	Standard	50 V	3 A	950 mV @ 3 A	Fast ≤ 500ns	DO-214AB (SMC)	—	—	-55 to 150°C	Active

Engineering Selection Recommendations

Primary Recommendation for Automotive Applications:

B350Q-13-F (Diodes Incorporated) is the preferred direct substitute. This part maintains AEC-Q101 qualification, automotive grade designation, and identical electrical specifications (50 V / 3 A) in the same DO-214AB SMC package. The Schottky technology provides lower forward voltage (700 mV vs. 750 mV) and improved efficiency. Operating temperature range matches the original (-55°C to 150°C). Product status is active with established supply availability.

Alternative for Automotive Applications:

B550CQ-13-F (Diodes Incorporated) provides AEC-Q101 qualification and automotive grade with increased current capability (5 A vs. 3 A) in the same DO-214AB SMC package. This part is suitable when design margins for current handling are required. Operating temperature range is -55°C to 150°C.

Secondary Recommendation for Non-Automotive Applications:

B350-13-F (Diodes Incorporated) offers identical electrical performance to B350Q-13-F with Schottky technology and fast recovery characteristics. This part lacks automotive grade and AEC-Q101 qualification but operates across -55°C to 125°C. Use is restricted to applications not requiring automotive qualification.

Alternative Package Options:

B350A-13-F (SMA package) and B350B-13-F (SMB package) provide equivalent electrical performance with AEC-Q101 qualification (B350A-13-F only) but require PCB layout modifications due to different package footprints. These are suitable only when package changes are acceptable.

Standard Technology Alternatives:

CSFC301-G and CURC301-G (Comchip Technology) and ES3A (Taiwan Semiconductor) provide standard technology equivalents in DO-214AB SMC package with fast recovery characteristics. These parts lack automotive qualification and AEC-Q101 certification. Forward voltage specifications exceed the original (950 mV to 1 V vs. 750 mV), resulting in higher power dissipation. Use is restricted to applications where automotive qualification is not required and forward voltage margin is acceptable.

Not Recommended:

CGRC501-G (Comchip Technology) exhibits standard recovery speed (> 500 ns) rather than fast recovery (≤ 500 ns) and lacks automotive qualification. This part does not meet the fast recovery requirement of the original specification.

Frequently Asked Questions (FAQ)

Q: Can B350Q-13-F directly replace SS35HR7G without PCB modifications?

A: Yes. B350Q-13-F is rated for identical voltage (50 V) and current (3 A) specifications and uses the same DO-214AB SMC package. No PCB layout changes are required. The Schottky technology provides lower forward voltage, improving efficiency without affecting compatibility.

Q: What is the difference between Schottky and standard technology diodes in this application?

A: Schottky diodes (B350Q-13-F, B350-13-F, B550C-13-F, B550CQ-13-F) exhibit lower forward voltage drop (700 mV) compared to standard technology (750 mV to 1 V), resulting in reduced power dissipation and improved thermal performance. Both technologies meet the fast recovery requirement (≤ 500 ns). Schottky diodes are preferred for efficiency-critical applications.

Q: Is B550CQ-13-F suitable as a substitute despite its 5 A rating?

A: Yes. B550CQ-13-F is rated for 50 V / 5 A, exceeding the original 50 V / 3 A specification. The higher current rating provides design margin and does not create compatibility issues. The part maintains AEC-Q101 qualification, automotive grade, and DO-214AB SMC package compatibility. This part is suitable for applications requiring increased current capacity or design margin.

Q: Why do some substitute parts lack AEC-Q101 qualification?

A: AEC-Q101 qualification requires automotive-grade testing and documentation. Parts without this qualification (B350-13-F, CSFC301-G, CURC301-G, ES3A, CGRC501-G) are suitable for non-automotive applications or applications where automotive qualification is not contractually required. For automotive applications, use only AEC-Q101 qualified parts (B350Q-13-F, B350A-13-F, B550CQ-13-F).

Q: Can I use B350A-13-F or B350B-13-F as substitutes?

A: B350A-13-F (SMA package) and B350B-13-F (SMB package) provide equivalent electrical performance but require PCB footprint changes. These parts are suitable only when package modifications are acceptable. B350A-13-F maintains AEC-Q101 qualification and automotive grade; B350B-13-F does not.

Q: What is the impact of forward voltage differences between substitute parts?

A: Forward voltage differences directly affect power dissipation and thermal performance. Lower forward voltage (700 mV for Schottky parts) reduces power loss compared to higher forward voltage (950 mV to 1 V for standard technology). In high-current or high-frequency applications, this difference becomes significant. Schottky substitutes (B350Q-13-F) are preferred for thermal efficiency.

Q: Is ES3A a suitable substitute despite being from the same manufacturer as the original?

A: ES3A (Taiwan Semiconductor) is electrically compatible with 50 V / 3 A ratings and fast recovery characteristics in the same DO-214AB SMC package. However, forward voltage is specified at 950 mV versus 750 mV for the original, resulting in higher power dissipation. ES3A lacks automotive grade and AEC-Q101 qualification. Use is restricted to non-automotive applications where forward voltage margin is acceptable.

Q: Why is CGRC501-G not recommended?

A: CGRC501-G exhibits standard recovery speed (> 500 ns) rather than the required fast recovery (≤ 500 ns). This part does not meet the speed specification of the original SS35HR7G and is not suitable as a substitute.

Q: What is the operating temperature range consideration for B350-13-F?

A: B350-13-F operates across -55°C to 125°C, which is narrower than the original SS35HR7G (-55°C to 150°C). This part is suitable for applications operating within the -55°C to 125°C range. For applications requiring operation above 125°C, use B350Q-13-F or B550CQ-13-F, which support -55°C to 150°C.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message