SS39HR7G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS39HR7G is a 90V, 3A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement. The part qualifies for automotive applications under AEC-Q101 and maintains ROHS3 compliance. Substitute parts must match the core electrical specifications: 90V reverse voltage rating, 3A average rectified current, fast recovery characteristics, and surface mount DO-214AB packaging.

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
Technology	Schottky	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS39HR7G is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria (Mandatory Match):

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

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Must not exceed 850 mV @ 3 A by more than 10% for thermal design equivalence
Current - Reverse Leakage @ Vr: Lower values indicate superior performance; values up to 500 µA @ 90 V remain functionally acceptable
Operating Temperature - Junction: Minimum -55°C to +150°C required; extended ranges provide design margin
RoHS Status: ROHS3 compliance preferred for regulatory alignment
Grade & Qualification: Automotive grade with AEC-Q101 qualification preferred for mission-critical applications

Substitute Categories:

Category A - Direct Equivalents (3A, 90V, Automotive-Qualified): Parts meeting all primary criteria with automotive qualification and ROHS3 compliance. These provide drop-in replacement capability with no design modification required.

Category B - Functional Equivalents (3A, 90V, Active Status): Parts meeting all primary electrical and mechanical criteria with active product status. Forward voltage and leakage characteristics remain within acceptable operational ranges. Suitable for non-automotive applications or where automotive qualification is not mandatory.

Category C - Higher Current Capability (5A/8A, 90V): Parts exceeding the 3A current requirement while maintaining 90V voltage rating. These provide design margin for current-limited applications and are suitable where thermal headroom is beneficial.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Tj (Min-Max) [°C]	Grade	AEC-Q101	RoHS Status	Product Status
SS39HR7G	Taiwan Semiconductor Corporation	90	3	850 @ 3A	100 @ 90V	-55 to 150	Automotive	Yes	ROHS3	Discontinued
B390-13-F	Diodes Incorporated	90	3	790 @ 3A	500 @ 90V	-55 to 125	—	No	ROHS3	Active
B390Q-13-F	Diodes Incorporated	90	3	790 @ 3A	500 @ 90V	-55 to 125	Automotive	Yes	ROHS3	Active
HSM390J/TR13	Microchip Technology	90	3	810 @ 3A	100 @ 90V	-55 to 175	—	No	RoHS non-compliant	Active
HSM390JE3/TR13	Microchip Technology	90	3	810 @ 3A	100 @ 90V	-55 to 175	—	No	ROHS3	Active
HSM590J/TR13	Microchip Technology	90	5	800 @ 5A	250 @ 90V	-55 to 175	—	No	RoHS non-compliant	Active
HSM590JE3/TR13	Microchip Technology	90	5	800 @ 5A	250 @ 90V	-55 to 175	—	No	ROHS3	Active
HSM890J/TR13	Microchip Technology	90	8	780 @ 8A	500 @ 90V	-55 to 175	—	No	RoHS non-compliant	Active
HSM890JE3/TR13	Microchip Technology	90	8	780 @ 8A	500 @ 90V	-55 to 175	—	No	ROHS3	Active
SS3H9-E3/57T	Vishay General Semiconductor - Diodes Division	90	3	800 @ 3A	20 @ 90V	-65 to 175	—	No	ROHS3	Active
SS3H9-E3/9AT	Vishay General Semiconductor - Diodes Division	90	3	800 @ 3A	20 @ 90V	-65 to 175	—	No	ROHS3	Active

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

The B390Q-13-F (Diodes Incorporated) is the primary recommended substitute. This part maintains automotive grade designation with AEC-Q101 qualification, matching the original SS39HR7G classification. Forward voltage is 790 mV @ 3A, representing a 7% improvement over the original 850 mV specification. Operating temperature range extends to -55°C to 125°C, providing adequate margin for most automotive thermal environments. ROHS3 compliance ensures regulatory alignment. Product status is active with established supply chain availability.

For General Industrial Applications without Automotive Qualification:

The SS3H9-E3/57T (Vishay General Semiconductor - Diodes Division) provides superior performance characteristics. Forward voltage is 800 mV @ 3A, and reverse leakage current is significantly lower at 20 µA @ 90V compared to the original 100 µA specification. Operating temperature range extends to -65°C to 175°C, providing extended thermal margin. ROHS3 compliance is maintained. Inventory availability is substantial at 30,200 pieces. This part is suitable for applications where leakage current minimization is beneficial.

For Applications Requiring Extended Temperature Range:

The HSM390JE3/TR13 (Microchip Technology) offers operating temperature range of -55°C to 175°C, exceeding the original -55°C to 150°C specification. Forward voltage is 810 mV @ 3A, within acceptable tolerance. Reverse leakage current matches the original at 100 µA @ 90V. ROHS3 compliance is confirmed. Product status is active. This selection is appropriate where thermal design margin is critical.

For Current-Limited Applications with Design Margin:

The HSM890JE3/TR13 (Microchip Technology) provides 8A average rectified current capability while maintaining 90V voltage rating. Forward voltage is 780 mV @ 8A, representing superior performance. Operating temperature range extends to -55°C to 175°C. ROHS3 compliance is maintained. This selection is appropriate where thermal headroom and current margin are design objectives.

Frequently Asked Questions (FAQ)

Q: Can the B390-13-F substitute for the SS39HR7G in automotive applications?

A: The B390-13-F meets all electrical and mechanical substitution criteria (90V, 3A, DO-214AB, fast recovery). However, it lacks automotive grade designation and AEC-Q101 qualification. For applications requiring automotive qualification, the B390Q-13-F is the appropriate selection. The B390-13-F is suitable for non-automotive industrial applications.

Q: What is the significance of the forward voltage difference between the SS39HR7G (850 mV) and substitute parts?

A: Forward voltage variation affects power dissipation and thermal design. The B390-13-F and SS3H9-E3/57T operate at 790-800 mV @ 3A, representing 6-7% lower dissipation than the original 850 mV specification. The HSM390JE3/TR13 operates at 810 mV, within 5% of the original. These differences are within normal component tolerance and do not require circuit redesign for most applications. Thermal analysis should account for the specific forward voltage of the selected substitute.

Q: Are the Microchip HSM390JE3/TR13 and HSM390J/TR13 interchangeable?

A: Both parts are electrically identical (90V, 3A, 810 mV @ 3A, 100 µA @ 90V leakage). The primary difference is RoHS compliance: HSM390JE3/TR13 is ROHS3 compliant, while HSM390J/TR13 is RoHS non-compliant. For new designs and applications requiring regulatory compliance, the HSM390JE3/TR13 is the appropriate selection.

Q: Can higher current-rated parts (HSM590JE3/TR13 at 5A or HSM890JE3/TR13 at 8A) be used as substitutes?

A: Yes, higher current-rated parts are functionally compatible substitutes. The 90V voltage rating and DO-214AB package remain identical. Higher current capability provides design margin and thermal headroom. Forward voltage characteristics differ: HSM590JE3/TR13 operates at 800 mV @ 5A, and HSM890JE3/TR13 operates at 780 mV @ 8A. These parts are suitable for applications where current margin is beneficial or where thermal design optimization is desired.

Q: What is the difference between SS3H9-E3/57T and SS3H9-E3/9AT packaging?

A: Both parts are electrically identical (90V, 3A, 800 mV @ 3A, 20 µA @ 90V leakage, -65°C to 175°C). The difference is in packaging format: SS3H9-E3/57T is supplied in Tape & Reel (TR) format with standard reel configuration, while SS3H9-E3/9AT uses an alternative tape and reel format. Selection depends on manufacturing equipment compatibility and procurement requirements. Electrical performance is identical.

Q: Why does the SS3H9-E3/57T have significantly lower reverse leakage current (20 µA) compared to the original SS39HR7G (100 µA)?

A: Reverse leakage current variation reflects differences in semiconductor manufacturing processes and die design between manufacturers. The SS3H9-E3/57T demonstrates superior leakage characteristics, which reduces standby power consumption and improves circuit performance in applications sensitive to leakage current. This represents a performance advantage rather than a compatibility concern.

Q: Is the operating temperature range difference between -55°C to 150°C (original) and -55°C to 175°C (substitutes) significant?

A: The extended upper temperature limit of 175°C in substitute parts provides additional thermal margin. For applications operating near the original 150°C limit, substitutes with 175°C rating offer design safety. For applications operating well below 150°C, this difference is not operationally significant. Thermal design analysis should reference the specific operating conditions of the application.

Q: Can non-ROHS3 compliant parts (HSM390J/TR13, HSM590J/TR13, HSM890J/TR13) be used in new designs?

A: RoHS non-compliant parts are subject to regulatory restrictions in many jurisdictions and are not recommended for new product designs. ROHS3-compliant alternatives are available for all electrical specifications. For ongoing support of legacy products, RoHS non-compliant parts may be acceptable if regulatory approval has been obtained. New designs should specify ROHS3-compliant substitutes.

Q: What is the impact of reverse leakage current variation (20 µA to 500 µA @ 90V) on circuit design?

A: Reverse leakage current affects standby power consumption and circuit performance in high-impedance applications. Lower leakage (20 µA in SS3H9-E3/57T) reduces standby current and improves efficiency. Higher leakage (500 µA in B390-13-F and HSM890JE3/TR13) remains within acceptable limits for most applications but increases standby power. For battery-powered or low-power applications, lower leakage parts are preferred. For standard rectification applications, leakage variation within the 20-500 µA range does not require circuit modification.

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