SS34HE3_A/I Equivalent & Substitute Parts

Part Overview

The SS34HE3_A/I is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This part is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and repair applications. The device is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500	mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 125	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS34HE3_A/I is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 500 mV @ 3 A (or lower)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: ≤ 500 µA @ 40 V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C to 125°C (minimum)
Technology: Schottky

Substitute parts are grouped into the following categories:

Direct Manufacturer Equivalents (Vishay): Parts with identical electrical specifications and packaging, differing only in packaging format (Tape & Reel vs. bulk).

Parametric Equivalents (Vishay): Parts meeting all critical electrical and mechanical parameters with variations in packaging configuration or temperature range extensions.

Manufacturer Recommended Alternatives: Parts from alternative manufacturers (Microchip Technology, Comchip Technology) that meet or exceed the electrical specifications and automotive qualification requirements.

Package Variant: The SS34 (SMA package) represents a different package form factor and is listed as an upgrade option.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Temp Range [°C]	Product Status	Packaging Format
SS34HE3_A/I	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	Discontinued	Bulk
SS34HE3_B/I	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 150	Active	Tape & Reel
SS34-3HE3/9AT	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	Active	Bulk
SS34-E3/57T	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	Active	Cut Tape
SS34-E3/9AT	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	Active	Tape & Reel
SS34-M3/57T	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	Active	Cut Tape & Digi-Reel
SS34-M3/9AT	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	Active	Tape & Reel
SS34	MDD	40	3	Not specified	500 @ 40V	DO-214AC, SMA	-55 to 125	Active	Bulk
5822SMJ/TR13	Microchip Technology	40	3	500 @ 3A	1500 @ 40V	DO-214AB, SMC	-55 to 150	Active	Tape & Reel
ACDBC340-HF	Comchip Technology	40	3	550 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	Active	Tape & Reel
CDBC340-G	Comchip Technology	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	Active	Tape & Reel

Engineering Selection Recommendations

Primary Substitutes (Vishay Parametric Equivalents):

The SS34HE3_B/I is the direct successor to the SS34HE3_A/I, offering identical electrical specifications with extended maximum junction temperature to 150°C and active product status. This part is available in Tape & Reel packaging and is the preferred replacement for discontinued inventory.

The SS34-E3/57T, SS34-E3/9AT, SS34-M3/57T, and SS34-M3/9AT are parametric equivalents meeting all critical electrical specifications. These parts are in active production status and available in multiple packaging formats (Cut Tape, Tape & Reel, Digi-Reel). Selection among these variants depends on procurement packaging requirements.

Secondary Substitutes (Alternative Manufacturers):

The CDBC340-G (Comchip Technology) meets all electrical and mechanical specifications with identical forward voltage and reverse leakage characteristics. This part carries AEC-Q101 automotive qualification and ROHS3 compliance.

The 5822SMJ/TR13 (Microchip Technology) meets voltage and current specifications with extended temperature range to 150°C. Reverse leakage is specified at 1.5 mA @ 40 V, which exceeds the 500 µA specification of the original part. This part is RoHS non-compliant and should be evaluated for compliance requirements in target applications.

The ACDBC340-HF (Comchip Technology) meets all specifications with forward voltage of 550 mV @ 3 A, which is 50 mV higher than the original specification. This part carries AEC-Q101 automotive qualification and ROHS3 compliance.

Package Variant:

The SS34 (MDD, SMA package) represents a different package form factor (DO-214AC vs. DO-214AB) and is not a direct mechanical substitute without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can SS34HE3_B/I be used as a direct replacement for SS34HE3_A/I?

A: Yes. The SS34HE3_B/I is electrically and mechanically identical to the SS34HE3_A/I, with the same voltage rating (40 V), current rating (3 A), forward voltage (500 mV @ 3 A), and DO-214AB package. The primary differences are active product status and extended maximum junction temperature (150°C vs. 125°C). Packaging format differs (Tape & Reel vs. bulk).

Q: What is the difference between SS34-E3/57T and SS34-E3/9AT?

A: Both parts are parametric equivalents with identical electrical specifications. The difference is packaging format: SS34-E3/57T is supplied in Cut Tape format, while SS34-E3/9AT is supplied in Tape & Reel format. Electrical performance is equivalent.

Q: Can I use the Microchip 5822SMJ/TR13 as a substitute?

A: The 5822SMJ/TR13 meets the voltage (40 V) and current (3 A) ratings with identical forward voltage (500 mV @ 3 A). However, reverse leakage is specified at 1.5 mA @ 40 V, which is three times higher than the 500 µA specification of the original part. Additionally, this part is RoHS non-compliant. Substitution requires evaluation of application leakage current tolerance and compliance requirements.

Q: Why is the SS34 (SMA package) listed as an upgrade?

A: The SS34 is a different package form factor (DO-214AC SMA vs. DO-214AB SMC). While electrical specifications are equivalent, the physical package dimensions differ, requiring PCB layout modification. This is not a direct mechanical substitute without design changes.

Q: Are all substitute parts AEC-Q101 qualified?

A: The SS34HE3_A/I, SS34HE3_B/I, ACDBC340-HF, and CDBC340-G carry AEC-Q101 automotive qualification. The Vishay parametric equivalents (SS34-3HE3/9AT, SS34-E3/57T, SS34-E3/9AT, SS34-M3/57T, SS34-M3/9AT) do not list AEC-Q101 qualification in the provided specifications. The Microchip 5822SMJ/TR13 does not list AEC-Q101 qualification.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Both are reel-based packaging formats. Cut Tape (CT) is supplied as individual strips cut from the reel, suitable for smaller quantity orders. Tape & Reel (TR) is supplied on the full reel, suitable for high-volume automated assembly. Electrical specifications are identical; selection depends on procurement volume and assembly equipment compatibility.

Q: Can I substitute ACDBC340-HF for SS34HE3_A/I if forward voltage is 50 mV higher?

A: The ACDBC340-HF forward voltage specification is 550 mV @ 3 A, compared to 500 mV @ 3 A for the original part. This 50 mV difference may affect circuit performance depending on application requirements. Substitution requires circuit analysis to confirm voltage drop tolerance.

Q: What is the significance of the extended temperature range in SS34HE3_B/I?

A: The SS34HE3_B/I maximum junction temperature is 150°C, compared to 125°C for the SS34HE3_A/I. This extended range provides additional thermal margin in high-temperature applications but does not affect electrical performance at standard operating temperatures.

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