SS34-3HE3_A/I Equivalent & Substitute Parts

Part Overview

The SS34-3HE3_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 design support and procurement requirements. The device is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH regulations.

Key Parameters

Parameter	Value
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
Technology	Schottky
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SS34-3HE3_A/I is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 500 mV @ 3 A (or within specified tolerance)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: ≤ 500 µA @ 40 V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Technology: Schottky

Substitute parts are grouped into three categories based on manufacturer and product status:

Category 1: Vishay Direct Equivalents (Same Manufacturer) Parts sharing the SS34 base product number with identical electrical specifications and automotive qualification. These include variants differing only in packaging format (Tape & Reel vs. individual packaging) or internal manufacturing codes.

Category 2: Comchip Technology Equivalents Alternative manufacturer parts meeting all electrical and mechanical requirements with AEC-Q101 qualification and automotive-grade designation.

Category 3: Microchip Technology Equivalents Alternative manufacturer parts meeting electrical and mechanical requirements with documented compatibility across the specified parameter range.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Ir @ Vr	Package	Temp Range	Product Status	Inventory
SS34-3HE3_A/I	Vishay	40 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 150°C	Discontinued	782 Pcs
SS34-3HE3_B/I	Vishay	40 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 150°C	Active	877 Pcs
SS34-3HE3_B/H	Vishay	40 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 150°C	Active	771 Pcs
SS34HE3_B/H	Vishay	40 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 150°C	Active	8144 Pcs
SS34HE3_B/I	Vishay	40 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 150°C	Active	5409 Pcs
SS34HM3_A/H	Vishay	40 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 150°C	Active	1067 Pcs
SS34HM3_A/I	Vishay	40 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 150°C	Active	1131 Pcs
ACDBC340-HF	Comchip Technology	40 V	3 A	550 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 125°C	Active	992 Pcs
CDBC340-G	Comchip Technology	40 V	3 A	500 mV @ 3 A	≤ 500ns	500 µA @ 40 V	DO-214AB	-55°C ~ 125°C	Active	3700 Pcs
5822SMJ/TR13	Microchip Technology	40 V	3 A	500 mV @ 3 A	≤ 500ns	1.5 mA @ 40 V	DO-214AB	-55°C ~ 150°C	Active	4037 Pcs
5822SMJE3/TR13	Microchip Technology	40 V	3 A	500 mV @ 3 A	≤ 500ns	1.5 mA @ 40 V	DO-214AB	-55°C ~ 150°C	Active	6550 Pcs

Engineering Selection Recommendations

Primary Substitutes (Vishay Equivalents)

The Vishay parts SS34-3HE3_B/I, SS34-3HE3_B/H, SS34HE3_B/H, SS34HE3_B/I, SS34HM3_A/H, and SS34HM3_A/I are direct electrical and mechanical equivalents to the SS34-3HE3_A/I. All maintain identical voltage, current, and thermal specifications with AEC-Q101 automotive qualification and ROHS3 compliance. These parts are currently in active production status with substantial inventory availability. Selection among these variants is determined by packaging format requirements (Tape & Reel vs. individual packaging) and internal manufacturing codes that do not affect electrical performance.

Secondary Substitutes (Comchip Technology)

CDBC340-G from Comchip Technology meets all electrical specifications with identical forward voltage characteristics (500 mV @ 3 A), reverse voltage (40 V), and current ratings (3 A). This part carries AEC-Q101 qualification and ROHS3 compliance. The maximum operating temperature is specified at 125°C, which is lower than the Vishay reference part (150°C). ACDBC340-HF from Comchip Technology is also qualified to AEC-Q101 with ROHS3 compliance but specifies forward voltage at 550 mV @ 3 A, representing a 50 mV increase over the reference specification.

Tertiary Substitutes (Microchip Technology)

5822SMJE3/TR13 and 5822SMJ/TR13 from Microchip Technology meet all electrical specifications with identical forward voltage (500 mV @ 3 A) and reverse voltage (40 V) ratings. Both parts maintain the full operating temperature range (-55°C ~ 150°C). Reverse leakage current is specified at 1.5 mA @ 40 V, which exceeds the reference specification of 500 µA @ 40 V. The 5822SMJE3/TR13 carries ROHS3 compliance; the 5822SMJ/TR13 is RoHS non-compliant. Both parts are in active production with high inventory levels.

Compliance and Certification Considerations

All recommended substitutes maintain automotive-grade designation and AEC-Q101 qualification. For applications requiring ROHS3 compliance, exclude 5822SMJ/TR13. For applications with maximum operating temperature requirements above 125°C, Vishay parts and Microchip parts are preferred over Comchip alternatives.

Frequently Asked Questions (FAQ)

Q: Can SS34-3HE3_B/I be used as a direct replacement for SS34-3HE3_A/I?

A: Yes. SS34-3HE3_B/I is electrically and mechanically identical to SS34-3HE3_A/I across all specified parameters: 40 V reverse voltage, 3 A average rectified current, 500 mV forward voltage @ 3 A, and identical thermal range (-55°C ~ 150°C). Both are AEC-Q101 qualified and ROHS3 compliant. The primary difference is product status: SS34-3HE3_A/I is discontinued while SS34-3HE3_B/I is active in production.

Q: What is the difference between SS34HE3_B/H and SS34HE3_B/I?

A: Both parts are electrically identical with matching voltage, current, and thermal specifications. The suffix designations (H vs. I) and packaging format (Tape & Reel) indicate internal manufacturing or packaging variations that do not affect electrical performance or compatibility.

Q: Can Comchip CDBC340-G replace the Vishay SS34-3HE3_A/I?

A: CDBC340-G meets all critical electrical specifications: 40 V reverse voltage, 3 A current rating, and 500 mV forward voltage @ 3 A. However, the maximum operating temperature is 125°C compared to 150°C for the Vishay part. For applications operating above 125°C, Vishay or Microchip alternatives are required.

Q: Why does ACDBC340-HF specify 550 mV forward voltage instead of 500 mV?

A: ACDBC340-HF is a parametric equivalent meeting the same voltage and current ratings but with a higher forward voltage specification (550 mV @ 3 A vs. 500 mV @ 3 A). This represents a 50 mV increase in forward voltage drop. Applications sensitive to power dissipation or voltage regulation should account for this difference.

Q: What is the significance of the higher reverse leakage current in Microchip parts?

A: Microchip 5822SMJE3/TR13 and 5822SMJ/TR13 specify reverse leakage current at 1.5 mA @ 40 V, compared to 500 µA @ 40 V for Vishay and Comchip parts. This represents a 3× increase in leakage current. Applications with stringent leakage requirements should prioritize Vishay or Comchip alternatives.

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

A: Vishay parts SS34-3HE3_B/H, SS34HE3_B/H, SS34HE3_B/I, SS34HM3_A/H, and SS34HM3_A/I are specified with Tape & Reel (TR) packaging. Comchip parts ACDBC340-HF and CDBC340-G are specified with Tape & Reel (TR) packaging. Microchip parts 5822SMJ/TR13 and 5822SMJE3/TR13 are specified with Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® packaging. Verify packaging format requirements before procurement.

Q: Which substitute offers the highest inventory availability?

A: SS34HE3_B/H from Vishay maintains the highest inventory level at 8144 pieces, followed by 5822SMJE3/TR13 from Microchip at 6550 pieces. Both parts are in active production status.

Q: Is RoHS compliance required for all applications?

A: RoHS compliance requirements depend on application and regulatory jurisdiction. SS34-3HE3_A/I, all Vishay substitutes, Comchip parts, and 5822SMJE3/TR13 are ROHS3 compliant. 5822SMJ/TR13 is RoHS non-compliant. For applications requiring RoHS compliance, exclude 5822SMJ/TR13.

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