SS39HM6G Equivalent & Substitute Parts

Part Overview

The SS39HM6G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 90 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement.

The SS39HM6G is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements. Due to its discontinued status, equivalent parts from active manufacturers provide direct functional replacement options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	90	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	mV
Current - Reverse Leakage @ Vr	100	µA @ 90 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS39HM6G is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria (Exact Match Required):

Voltage - DC Reverse (Vr) (Max): 90 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Operating Temperature Range: Substitute parts must support the application's thermal requirements
RoHS and REACH Compliance: Compliance status must match or exceed the original specification
Automotive Grade and AEC-Q101 Qualification: Required for automotive applications

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (3 A Rating) Parts with identical 90 V / 3 A ratings and DO-214AB packaging. These include B390-13-F, B390Q-13-F, HSM390JE3/TR13, SS3H9-E3/57T, and SS3H9-E3/9AT. These parts are interchangeable based on electrical specifications and package compatibility.

Category 2: Higher Current Capability (5 A and 8 A Ratings) Parts with identical 90 V reverse voltage but higher current ratings (HSM590JE3/TR13 at 5 A, HSM890JE3/TR13 at 8 A). These provide functional substitution with enhanced current handling capability and are suitable for applications where the original 3 A rating is marginal or where design margin is required.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Temp Range [°C]	RoHS Status	AEC-Q101	Product Status
SS39HM6G	Taiwan Semiconductor	90	3	850 @ 3A	100 @ 90V	DO-214AB	-55 ~ 150	ROHS3	Yes	Discontinued
B390-13-F	Diodes Incorporated	90	3	790 @ 3A	500 @ 90V	DO-214AB	-55 ~ 125	ROHS3	No	Active
B390Q-13-F	Diodes Incorporated	90	3	790 @ 3A	500 @ 90V	DO-214AB	-55 ~ 125	ROHS3	Yes	Active
HSM390J/TR13	Microchip Technology	90	3	810 @ 3A	100 @ 90V	DO-214AB	-55 ~ 175	RoHS NC	No	Active
HSM390JE3/TR13	Microchip Technology	90	3	810 @ 3A	100 @ 90V	DO-214AB	-55 ~ 175	ROHS3	No	Active
HSM590JE3/TR13	Microchip Technology	90	5	800 @ 5A	250 @ 90V	DO-214AB	-55 ~ 175	ROHS3	No	Active
HSM890JE3/TR13	Microchip Technology	90	8	780 @ 8A	500 @ 90V	DO-214AB	-55 ~ 175	ROHS3	No	Active
SS3H9-E3/57T	Vishay General Semiconductor	90	3	800 @ 3A	20 @ 90V	DO-214AB	-65 ~ 175	ROHS3	No	Active
SS3H9-E3/9AT	Vishay General Semiconductor	90	3	800 @ 3A	20 @ 90V	DO-214AB	-65 ~ 175	ROHS3	No	Active

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

B390Q-13-F (Diodes Incorporated) is the primary substitute for the SS39HM6G. This part maintains AEC-Q101 qualification, ROHS3 compliance, and identical 90 V / 3 A electrical ratings. The forward voltage is 60 mV lower (790 mV vs. 850 mV), which represents improved efficiency. The reverse leakage current is higher (500 µA vs. 100 µA), which is acceptable within automotive design margins. Operating temperature range is -55°C to 125°C, which is narrower than the original -55°C to 150°C specification; thermal design verification is required for applications exceeding 125°C junction temperature.

For Non-Automotive Applications with ROHS3 Compliance:

HSM390JE3/TR13 (Microchip Technology) provides direct electrical equivalence with extended operating temperature range (-55°C to 175°C). This part offers superior thermal performance and maintains ROHS3 compliance. Forward voltage (810 mV) and reverse leakage current (100 µA) match the original specification closely. AEC-Q101 qualification is not provided; this part is suitable for industrial and consumer applications.

SS3H9-E3/57T (Vishay General Semiconductor) offers the lowest reverse leakage current (20 µA @ 90 V) among all substitutes, providing superior leakage performance. Extended operating temperature range (-65°C to 175°C) and ROHS3 compliance are provided. This part is suitable for precision analog applications where leakage current minimization is critical.

For Applications Requiring Higher Current Margin:

HSM890JE3/TR13 (Microchip Technology) at 8 A rating provides significant current margin over the original 3 A specification while maintaining 90 V reverse voltage rating and DO-214AB packaging. This part is suitable for designs where current headroom is required or where thermal derating is a concern. Extended operating temperature range (-55°C to 175°C) and ROHS3 compliance are provided.

Compliance and Regulatory Considerations:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. For automotive applications, B390Q-13-F is the only substitute maintaining AEC-Q101 qualification. For non-automotive applications, HSM390JE3/TR13 and SS3H9-E3/57T provide active product status with extended thermal performance.

Frequently Asked Questions (FAQ)

Q: Can B390-13-F be used as a direct substitute for SS39HM6G in automotive applications?

A: B390-13-F is not qualified to AEC-Q101 automotive standards. For automotive applications, B390Q-13-F is the appropriate substitute, as it maintains AEC-Q101 qualification. B390-13-F is suitable for industrial and consumer applications only.

Q: What is the significance of the forward voltage difference between SS39HM6G (850 mV) and B390Q-13-F (790 mV)?

A: The 60 mV lower forward voltage in B390Q-13-F represents improved efficiency and lower power dissipation at the same 3 A current level. This difference is within normal design margins for Schottky diode applications and does not affect functional compatibility. Thermal design may benefit from the reduced dissipation.

Q: Can HSM890JE3/TR13 (8 A rating) be used in place of SS39HM6G (3 A rating)?

A: Yes. HSM890JE3/TR13 maintains identical 90 V reverse voltage rating and DO-214AB packaging. The higher 8 A current rating provides functional substitution with enhanced current capability. This part is suitable for applications where the original 3 A rating is marginal or where design margin is required. Verify that the application does not have current-limiting requirements that would be violated by the higher rating.

Q: What is the difference between HSM390J/TR13 and HSM390JE3/TR13?

A: Both parts are manufactured by Microchip Technology with identical electrical specifications (90 V, 3 A, 810 mV forward voltage). The primary difference is RoHS compliance: HSM390J/TR13 is RoHS non-compliant, while HSM390JE3/TR13 is ROHS3 compliant. For new designs, HSM390JE3/TR13 is the appropriate selection.

Q: Why does SS3H9-E3/57T have significantly lower reverse leakage current (20 µA vs. 100 µA)?

A: Reverse leakage current variation is a normal characteristic of Schottky diode manufacturing and design. SS3H9-E3/57T exhibits superior leakage performance, which is beneficial for precision analog applications, low-power standby circuits, and applications sensitive to leakage current. This lower leakage does not affect switching performance or forward voltage characteristics.

Q: Are SS3H9-E3/57T and SS3H9-E3/9AT interchangeable?

A: Yes. Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications and operating temperature range. The difference is packaging format: SS3H9-E3/57T is supplied in Tape & Reel (TR) format with 57 mm reel, while SS3H9-E3/9AT is supplied in Tape & Reel format with 9 mm reel. Selection depends on assembly equipment compatibility and tape reel specifications.

Q: What is the impact of the narrower operating temperature range in B390Q-13-F (-55°C to 125°C vs. -55°C to 150°C)?

A: The 25°C reduction in maximum junction temperature requires verification that the application's thermal design maintains junction temperature below 125°C. For applications with junction temperatures between 125°C and 150°C, alternative substitutes such as HSM390JE3/TR13 or SS3H9-E3/57T with extended temperature ranges (-55°C to 175°C) are required.

Q: Can non-AEC-Q101 qualified parts be used in automotive applications?

A: AEC-Q101 qualification is a requirement for automotive-grade components in regulated automotive applications. For safety-critical automotive systems, AEC-Q101 qualification is mandatory. B390Q-13-F is the only substitute maintaining this qualification. Non-qualified parts may be acceptable for non-safety-critical automotive subsystems; verification with design authority and quality requirements is necessary.

Q: What is the significance of REACH unaffected status?

A: REACH unaffected status indicates that the component does not contain substances of very high concern (SVHC) listed under REACH regulations. All parts in this comparison maintain REACH unaffected status, confirming compliance with European chemical safety requirements.

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