SS35HM6G Equivalent & Substitute Parts

Part Overview

The SS35HM6G 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 (≤500 ns) and automotive-grade qualification under AEC-Q101, making it suitable for power conversion and protection applications requiring reliable rectification performance.

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 ≤500 ns, >200 mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 50 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS35HM6G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Package / Case: Must be DO-214AB (SMC) for direct mechanical and electrical compatibility
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must support -55°C to 150°C junction temperature
Speed Classification: Must support Fast Recovery (≤500 ns, >200 mA)

Secondary Compatibility Factors:

Forward Voltage (Vf): Acceptable range 700 mV to 1.15 V @ rated current
Reverse Leakage Current: Acceptable range 5 µA to 500 µA @ 50 V
Compliance: RoHS3 and REACH requirements must be met
Automotive Grade and AEC-Q101 qualification preferred for equivalent performance

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Functional Alternatives (same voltage and current ratings with different package options or technology variants).

Parameter Comparison

Part Number	Manufacturer	Technology	Vr (Max)	Io	Vf (Max) @ If	Speed	Package	Temp Range	Grade	AEC-Q101	Product Status
SS35HM6G	Taiwan Semiconductor	Standard	50 V	3 A	750 mV @ 3 A	Fast ≤500 ns	DO-214AB (SMC)	-55 to 150°C	Automotive	Yes	Discontinued
B350Q-13-F	Diodes Incorporated	Schottky	50 V	3 A	700 mV @ 3 A	Fast ≤500 ns	DO-214AB (SMC)	-55 to 150°C	Automotive	Yes	Active
B350-13-F	Diodes Incorporated	Schottky	50 V	3 A	700 mV @ 3 A	Fast ≤500 ns	DO-214AB (SMC)	-55 to 125°C	—	—	Active
B350A-13-F	Diodes Incorporated	Schottky	50 V	3 A	700 mV @ 3 A	Fast ≤500 ns	DO-214AC (SMA)	-55 to 150°C	Automotive	Yes	Active
B350B-13-F	Diodes Incorporated	Schottky	50 V	3 A	700 mV @ 3 A	Fast ≤500 ns	DO-214AA (SMB)	-55 to 150°C	—	—	Active
B550C-13-F	Diodes Incorporated	Schottky	50 V	5 A	700 mV @ 5 A	Fast ≤500 ns	DO-214AB (SMC)	-55 to 150°C	—	—	Active
B550CQ-13-F	Diodes Incorporated	Schottky	50 V	5 A	700 mV @ 5 A	Fast ≤500 ns	DO-214AB (SMC)	-55 to 150°C	Automotive	Yes	Active
CGRC501-G	Comchip Technology	Standard	50 V	5 A	1.15 V @ 5 A	Standard >500 ns	DO-214AB (SMC)	—	—	—	Active
CSFC301-G	Comchip Technology	Standard	50 V	3 A	950 mV @ 3 A	Fast ≤500 ns	DO-214AB (SMC)	—	—	—	Active
CURC301-G	Comchip Technology	Standard	50 V	3 A	1 V @ 3 A	Fast ≤500 ns	DO-214AB (SMC)	—	—	—	Active
ES3A	Taiwan Semiconductor	Standard	50 V	3 A	950 mV @ 3 A	Fast ≤500 ns	DO-214AB (SMC)	-55 to 150°C	—	—	Active

Engineering Selection Recommendations

Tier 1 - Direct Equivalent (Automotive Grade, AEC-Q101):

B350Q-13-F is the primary substitute for SS35HM6G. This Schottky diode from Diodes Incorporated meets all critical electrical parameters (50 V, 3 A, DO-214AB package) and maintains automotive-grade qualification with AEC-Q101 certification. The forward voltage is 50 mV lower (700 mV vs. 750 mV), resulting in improved efficiency. Operating temperature range (-55°C to 150°C) matches the original specification. Product status is active with 674 units in stock.

B550CQ-13-F provides an alternative with higher current rating (5 A vs. 3 A) in the same package, maintaining automotive-grade qualification and AEC-Q101 certification. This part is suitable for applications requiring design margin or future current headroom. Operating temperature range and package compatibility are identical to the original.

Tier 2 - Functional Equivalent (Same Electrical Ratings, Different Package):

B350A-13-F offers identical electrical specifications (50 V, 3 A, fast recovery) with automotive-grade qualification and AEC-Q101 certification, but in a DO-214AC (SMA) package instead of DO-214AB (SMC). This substitution requires PCB layout modification and is suitable only when package footprint change is acceptable.

Tier 3 - Functional Alternative (Same Voltage/Current, Non-Automotive):

B350-13-F and B350B-13-F are Schottky alternatives from Diodes Incorporated with identical electrical ratings but lack automotive-grade designation and AEC-Q101 certification. Operating temperature range for B350-13-F is limited to -55°C to 125°C. These parts are suitable for non-automotive applications where automotive qualification is not required.

Tier 4 - Standard Technology Alternatives (Same Package, Higher Forward Voltage):

CSFC301-G and CURC301-G from Comchip Technology maintain the DO-214AB package and 50 V / 3 A ratings with fast recovery characteristics. Forward voltage is higher (950 mV to 1 V vs. 750 mV), resulting in increased power dissipation. These parts lack automotive-grade designation and specified operating temperature range. Suitable for cost-sensitive, non-automotive applications.

ES3A from Taiwan Semiconductor (same manufacturer as original) provides a standard technology alternative with identical voltage/current ratings and DO-214AB package. Forward voltage is 950 mV, and operating temperature range is -55°C to 150°C. Product status is active with 17,100 units in stock.

Tier 5 - Higher Current Alternatives (Same Package, Increased Current Rating):

CGRC501-G from Comchip Technology provides 5 A current rating in the DO-214AB package with 50 V reverse voltage. Forward voltage is significantly higher (1.15 V @ 5 A), and speed classification is standard recovery (>500 ns) rather than fast recovery. This part lacks automotive qualification and specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can B350Q-13-F directly replace SS35HM6G without circuit modification?

A: Yes. B350Q-13-F is electrically and mechanically compatible with SS35HM6G. Both devices share identical voltage rating (50 V), current rating (3 A), package (DO-214AB/SMC), and operating temperature range (-55°C to 150°C). The lower forward voltage (700 mV vs. 750 mV) improves efficiency without requiring design changes.

Q: What is the difference between Schottky and Standard technology diodes in these substitutes?

A: Schottky diodes (B350 series) feature lower forward voltage drop (typically 700 mV) and faster switching characteristics compared to standard junction diodes (SS35HM6G, ES3A, CSFC301-G). Standard technology diodes exhibit higher forward voltage (750 mV to 1.15 V) but may offer lower reverse leakage in some applications. Technology selection depends on circuit requirements for efficiency versus leakage performance.

Q: Why do some substitute parts have different operating temperature ranges?

A: Operating temperature range reflects the manufacturer's qualification and testing scope. B350-13-F is rated to 125°C maximum junction temperature, while B350Q-13-F and SS35HM6G are rated to 150°C. For applications operating near the upper temperature limit, parts with the full -55°C to 150°C range are required.

Q: Can B350A-13-F (SMA package) be used instead of SS35HM6G (SMC package)?

A: B350A-13-F is electrically equivalent but requires PCB layout modification due to different package footprint (DO-214AC/SMA vs. DO-214AB/SMC). Substitution is possible only if the PCB design can accommodate the alternative package or if the board is being redesigned.

Q: What is the significance of AEC-Q101 certification?

A: AEC-Q101 is the automotive electronics council qualification standard for discrete semiconductors. Parts meeting this standard have undergone rigorous testing for reliability, temperature cycling, and performance consistency. For automotive applications, AEC-Q101 certification is mandatory. B350Q-13-F and B550CQ-13-F maintain this certification, while CSFC301-G and CURC301-G do not.

Q: Is B550CQ-13-F a suitable substitute if my circuit only requires 3 A?

A: Yes. B550CQ-13-F is rated for 5 A and maintains all other specifications identical to the original (50 V, DO-214AB package, -55°C to 150°C, automotive grade, AEC-Q101). The higher current rating provides design margin and does not negatively impact circuit performance at 3 A operation.

Q: Why is forward voltage important when selecting a substitute?

A: Forward voltage (Vf) determines power dissipation in the diode. Lower forward voltage reduces heat generation and improves circuit efficiency. SS35HM6G specifies 750 mV, while Schottky alternatives (B350Q-13-F) specify 700 mV, resulting in 50 mV lower drop. Standard technology alternatives (CSFC301-G, CURC301-G) specify 950 mV to 1 V, increasing power dissipation by 200-250 mV.

Q: What does "Fast Recovery ≤500 ns" mean?

A: Reverse recovery time (trr) is the time required for a forward-biased diode to stop conducting when reverse bias is applied. Fast recovery (≤500 ns) is suitable for high-frequency switching applications and power conversion circuits. Standard recovery (>500 ns) is acceptable for lower-frequency rectification but may cause increased switching losses in high-frequency applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed meet RoHS3 compliance requirements. SS35HM6G and all active alternatives (B350Q-13-F, B350-13-F, B350A-13-F, B350B-13-F, B550C-13-F, B550CQ-13-F, CGRC501-G, CSFC301-G, CURC301-G, ES3A) are ROHS3 compliant and REACH unaffected.

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