SS39 M6G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS39 M6G 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 discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while meeting modern compliance standards.

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
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 90 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS39 M6G is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 90 V
Current - Average Rectified (Io): Must equal or exceed 3 A
Package / Case: Must be DO-214AB or SMC equivalent
Mounting Type: Must be Surface Mount
Technology: Must be Schottky

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current: Acceptable range 780–850 mV @ 3 A
Reverse leakage current: Acceptable range 20–500 µA @ 90 V
Operating temperature range: Minimum -55°C to +125°C required
RoHS compliance: ROHS3 Compliant preferred for modern applications

Substitute parts are grouped into two categories:

Category A – Direct Electrical Equivalents (3 A Rating): Parts with identical 90 V / 3 A specifications, suitable for direct replacement in existing designs.

Category B – Higher Current Capability (5 A and 8 A Ratings): Parts with 90 V rating but higher current capacity (5 A or 8 A), suitable for applications requiring increased current margin or thermal headroom.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Tj (Min–Max) [°C]	Package	Product Status	RoHS Status
SS39 M6G	Taiwan Semiconductor Corporation	90	3	850 @ 3 A	100 @ 90 V	-55 to 150	DO-214AB (SMC)	Discontinued	ROHS3 Compliant
B390-13-F	Diodes Incorporated	90	3	790 @ 3 A	500 @ 90 V	-55 to 125	DO-214AB (SMC)	Active	ROHS3 Compliant
B390Q-13-F	Diodes Incorporated	90	3	790 @ 3 A	500 @ 90 V	-55 to 125	DO-214AB (SMC)	Active	ROHS3 Compliant
HSM390J/TR13	Microchip Technology	90	3	810 @ 3 A	100 @ 90 V	-55 to 175	DO-214AB (SMC)	Active	RoHS non-compliant
HSM390JE3/TR13	Microchip Technology	90	3	810 @ 3 A	100 @ 90 V	-55 to 175	DO-214AB (SMC)	Active	ROHS3 Compliant
HSM590J/TR13	Microchip Technology	90	5	800 @ 5 A	250 @ 90 V	-55 to 175	DO-214AB (SMC)	Active	RoHS non-compliant
HSM590JE3/TR13	Microchip Technology	90	5	800 @ 5 A	250 @ 90 V	-55 to 175	DO-214AB (SMC)	Active	ROHS3 Compliant
HSM890J/TR13	Microchip Technology	90	8	780 @ 8 A	500 @ 90 V	-55 to 175	DO-214AB (SMC)	Active	RoHS non-compliant
HSM890JE3/TR13	Microchip Technology	90	8	780 @ 8 A	500 @ 90 V	-55 to 175	DO-214AB (SMC)	Active	ROHS3 Compliant
SS3H9-E3/57T	Vishay General Semiconductor - Diodes Division	90	3	800 @ 3 A	20 @ 90 V	-65 to 175	DO-214AB (SMC)	Active	ROHS3 Compliant
SS3H9-E3/9AT	Vishay General Semiconductor - Diodes Division	90	3	800 @ 3 A	20 @ 90 V	-65 to 175	DO-214AB (SMC)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Direct Replacements (3 A Category):

SS3H9-E3/57T (Vishay General Semiconductor - Diodes Division)
- Identical 90 V / 3 A electrical specification
- Active product status with high inventory availability (30,200 pcs)
- ROHS3 Compliant
- Extended operating temperature range (-65°C to 175°C) exceeds original specification
- Lower reverse leakage current (20 µA @ 90 V) compared to SS39 M6G (100 µA @ 90 V)
- Tape & Reel packaging suitable for automated assembly
HSM390JE3/TR13 (Microchip Technology)
- Identical 90 V / 3 A electrical specification
- Active product status with adequate inventory (1,006 pcs)
- ROHS3 Compliant
- Extended operating temperature range (-55°C to 175°C)
- Forward voltage (810 mV @ 3 A) within acceptable range
- Reverse leakage current (100 µA @ 90 V) matches original specification
B390-13-F (Diodes Incorporated)
- Identical 90 V / 3 A electrical specification
- Active product status with high inventory availability (15,200 pcs)
- ROHS3 Compliant
- Forward voltage (790 mV @ 3 A) lower than original, indicating improved efficiency
- Operating temperature range (-55°C to 125°C) meets minimum requirement

Alternative Selections (Higher Current Capability):

HSM590JE3/TR13 (Microchip Technology) – 5 A Rating
- Suitable for applications requiring increased current margin
- Active product status with adequate inventory (974 pcs)
- ROHS3 Compliant
- Extended operating temperature range (-55°C to 175°C)
HSM890JE3/TR13 (Microchip Technology) – 8 A Rating
- Suitable for applications requiring maximum current headroom
- Active product status with adequate inventory (1,147 pcs)
- ROHS3 Compliant
- Extended operating temperature range (-55°C to 175°C)
- Lowest forward voltage (780 mV @ 8 A) among all options

Non-Recommended Options:

HSM390J/TR13 and HSM590J/TR13 and HSM890J/TR13: RoHS non-compliant status disqualifies these for new designs requiring modern compliance standards
B390Q-13-F: Automotive-grade variant (AEC-Q101) suitable only for automotive applications; standard industrial applications should use B390-13-F

Frequently Asked Questions (FAQ)

Q: Can I use a higher current-rated diode (5 A or 8 A) as a direct replacement for the 3 A SS39 M6G?

A: Yes. Higher current-rated diodes are electrically compatible substitutes. The 90 V reverse voltage rating remains constant across all options. A 5 A or 8 A diode will operate safely in a 3 A circuit, providing additional thermal margin and reliability. No circuit modification is required.

Q: What is the difference between B390-13-F and B390Q-13-F?

A: B390Q-13-F is an automotive-grade variant qualified to AEC-Q101 standard, intended for automotive applications. B390-13-F is the standard industrial-grade equivalent. Both share identical electrical specifications (90 V / 3 A). Select B390Q-13-F only if automotive qualification is required.

Q: Why do some substitute parts have lower forward voltage (Vf) than the original SS39 M6G?

A: Forward voltage variation within the specified range (780–850 mV @ 3 A) is normal across different manufacturers and process technologies. Lower forward voltage indicates improved efficiency and reduced power dissipation. This is a beneficial characteristic and does not affect compatibility.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Yes. All listed substitute parts are supplied in Tape & Reel packaging suitable for automated pick-and-place assembly. Packaging format is consistent across all options.

Q: Which substitute part has the lowest reverse leakage current?

A: SS3H9-E3/57T and SS3H9-E3/9AT both exhibit 20 µA @ 90 V reverse leakage current, significantly lower than the original SS39 M6G (100 µA @ 90 V). Lower reverse leakage reduces standby power consumption and improves circuit performance in low-power applications.

Q: What is the significance of the operating temperature range difference between parts?

A: The original SS39 M6G operates from -55°C to 150°C. Most substitute parts extend the upper limit to 175°C, providing additional thermal margin. This extended range does not affect compatibility; it indicates improved thermal performance and reliability in high-temperature environments.

Q: Is RoHS compliance mandatory for selecting a substitute part?

A: For new designs and modern applications, ROHS3 Compliant status is required. Parts marked as "RoHS non-compliant" (HSM390J/TR13, HSM590J/TR13, HSM890J/TR13) should not be selected unless legacy system compatibility is explicitly required.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes. All listed substitute parts are electrically equivalent at the 90 V / 3 A specification level. Mixing different manufacturers or current ratings in the same design is acceptable from an electrical standpoint. However, for manufacturing consistency and supply chain management, using a single part number across a design is recommended.

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

A: Both parts are identical in electrical specification (90 V / 3 A). The primary difference is RoHS compliance: HSM390JE3/TR13 is ROHS3 Compliant, while HSM390J/TR13 is RoHS non-compliant. For new designs, HSM390JE3/TR13 is the correct selection.

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