SS3H9-M3/9AT Equivalent & Substitute Parts

Part Overview

The SS3H9-M3/9AT is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 90 V DC reverse voltage with a 3 A average rectified current rating and is housed in a DO-214AB (SMC) package. The device is classified as Active product status and is RoHS3 compliant with REACH unaffected designation.

Substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific packaging and qualification needs while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	90 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	800 mV @ 3 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 175°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SS3H9-M3/9AT is determined by the following critical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 800 mV @ 3 A (with tolerance variance)
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction: -65°C ~ 175°C (or higher range)
RoHS Status: ROHS3 Compliant

Parts are grouped into two categories: Parametric Equivalents (identical electrical specifications from Vishay) and Manufacturer Recommended Equivalent (alternative manufacturer with comparable performance characteristics).

Parameter Comparison

Parameter	SS3H9-M3/9AT	SS3H9-E3/57T	SS3H9-E3/9AT	SS3H9HE3_B/H	SS39
Manufacturer	Vishay	Vishay	Vishay	Vishay	Taiwan Semiconductor
Voltage - DC Reverse (Vr) (Max)	90 V	90 V	90 V	90 V	90 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	800 mV @ 3 A	800 mV @ 3 A	800 mV @ 3 A	800 mV @ 3 A	850 mV @ 3 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA	Fast Recovery ≤ 500 ns, > 200 mA
Current - Reverse Leakage @ Vr	200 µA @ 90 V	20 µA @ 90 V	20 µA @ 90 V	20 µA @ 90 V	100 µA @ 90 V
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Vishay Parametric Equivalents (SS3H9-E3/57T, SS3H9-E3/9AT, SS3H9HE3_B/H):

These parts share identical electrical specifications with the primary device and are manufactured by the same supplier. All three maintain 90 V reverse voltage, 3 A current rating, and 800 mV forward voltage characteristics. The SS3H9-E3/57T and SS3H9-E3/9AT feature improved reverse leakage current specifications (20 µA versus 200 µA), resulting in lower power dissipation. The SS3H9HE3_B/H variant includes AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade reliability. All Vishay variants are ROHS3 compliant with unlimited moisture sensitivity rating.

Taiwan Semiconductor SS39 (Manufacturer Recommended):

The SS39 represents an alternative manufacturer option with comparable core specifications. This device maintains the 90 V reverse voltage and 3 A current rating in identical DO-214AB packaging. The forward voltage specification is 850 mV at 3 A, representing a 50 mV increase over the Vishay baseline. Reverse leakage current is specified at 100 µA, intermediate between the primary device and improved Vishay variants. The operating temperature range is -55°C to 150°C, which is narrower than the Vishay range of -65°C to 175°C. This part is ROHS3 compliant and carries unlimited MSL rating.

Selection Basis:

For applications requiring lowest reverse leakage and optimized thermal performance, select SS3H9-E3/57T or SS3H9-E3/9AT
For automotive applications with AEC-Q101 qualification requirement, select SS3H9HE3_B/H
For alternative manufacturer sourcing with acceptable performance variance, select SS39
All substitutes maintain full electrical and mechanical compatibility within specified parameter ranges

Frequently Asked Questions (FAQ)

Q: Can SS3H9-E3/57T be used as a direct replacement for SS3H9-M3/9AT?

A: Yes. Both devices share identical voltage (90 V), current (3 A), and package specifications (DO-214AB, SMC). The SS3H9-E3/57T features superior reverse leakage characteristics (20 µA versus 200 µA), making it a direct electrical substitute with improved performance.

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

A: Both parts are parametric equivalents with identical electrical specifications. The designation suffix indicates different tape and reel configurations. Functionally, they are interchangeable for circuit applications.

Q: Is SS39 from Taiwan Semiconductor fully compatible with SS3H9-M3/9AT?

A: SS39 is compatible for most applications. The forward voltage is 50 mV higher (850 mV versus 800 mV), and the operating temperature range is narrower (-55°C to 150°C versus -65°C to 175°C). These differences are within acceptable tolerance for standard rectification applications but should be evaluated for temperature-critical or precision applications.

Q: What does the SS3H9HE3_B/H automotive qualification mean?

A: The SS3H9HE3_B/H carries AEC-Q101 qualification, indicating compliance with automotive industry reliability and quality standards. This variant is suitable for automotive and high-reliability applications requiring documented qualification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SS3H9-E3/57T, SS3H9-E3/9AT, SS3H9HE3_B/H, and SS39) are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: Can I mix different substitute parts in the same production batch?

A: All substitute parts maintain identical package geometry (DO-214AB, SMC) and mounting type (surface mount), allowing interchangeability at the PCB assembly level. However, reverse leakage current and forward voltage specifications vary slightly between manufacturers and variants, which may affect circuit performance in precision applications.

Q: What is the inventory status for each substitute?

A: SS3H9-E3/57T has the highest availability (30,200 units), followed by SS3H9-E3/9AT (3,300 units), SS3H9HE3_B/H (2,485 units), and SS39 (1,210 units). The primary part SS3H9-M3/9AT has 978 units in stock.

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