SS34HE3_A/H Equivalent & Substitute Parts

Part Overview

The SS34HE3_A/H 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 requirements and production needs. The part carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant, making it suitable for automotive and industrial applications requiring fast recovery rectification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500	mV @ 3 A
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Technology	Schottky	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
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/H is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

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

Acceptable Variation Parameters:

Operating Temperature - Junction: -55°C minimum and 125°C minimum (higher maximum ratings are acceptable)
Packaging format (Tape & Reel, Cut Tape, or bulk)
Reverse leakage current lower than 500 µA @ 40 V is acceptable
Forward voltage up to 550 mV @ 3 A is acceptable for non-critical applications

Substitute parts are grouped into three categories: direct manufacturer equivalents from Vishay, parametric equivalents from Vishay with different packaging, and manufacturer-recommended alternatives from Microchip Technology and Comchip Technology.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Ir @ Vr [µA @ V]	Speed	Package	Tj (Max) [°C]	Grade	Product Status
SS34HE3_A/H	Vishay	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	Automotive	Discontinued
SS34HE3_B/H	Vishay	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	150	Automotive	Active
SS34-3HE3/9AT	Vishay	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	—	Active
SS34-E3/57T	Vishay	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	—	Active
SS34-E3/9AT	Vishay	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	—	Active
SS34-M3/57T	Vishay	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	—	Active
SS34-M3/9AT	Vishay	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	—	Active
5822SMJ/TR13	Microchip Technology	40	3	500 @ 3	1500 @ 40	Fast Recovery ≤ 500ns	DO-214AB	150	—	Active
ACDBC340-HF	Comchip Technology	40	3	550 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	Automotive	Active
CDBC340-G	Comchip Technology	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	—	Active
B340-13-F	Diodes Incorporated	40	3	500 @ 3	500 @ 40	Fast Recovery ≤ 500ns	DO-214AB (SMC)	125	—	Active

Engineering Selection Recommendations

Primary Recommendation: SS34HE3_B/H

The SS34HE3_B/H is the direct successor to the SS34HE3_A/H from the same manufacturer (Vishay General Semiconductor - Diodes Division). This part maintains identical electrical specifications while offering an extended maximum junction temperature rating of 150°C compared to 125°C. The part is currently active in production with substantial inventory availability (8,144 pcs). It carries the same automotive-grade qualification (AEC-Q101) and RoHS3 compliance as the original part. The primary difference is packaging format (Tape & Reel), which is standard for production environments.

Secondary Recommendations: Vishay Parametric Equivalents

The Vishay parametric equivalents (SS34-3HE3/9AT, SS34-E3/57T, SS34-E3/9AT, SS34-M3/57T, SS34-M3/9AT) provide identical electrical performance with the same 40 V / 3 A ratings and 500 mV forward voltage specification. These parts differ only in packaging format and tape configuration. All are currently active with varying inventory levels. Selection among these variants should be based on procurement packaging requirements (Cut Tape, Tape & Reel, or Digi-Reel format).

Alternative Manufacturer Options

The CDBC340-G (Comchip Technology) and B340-13-F (Diodes Incorporated) provide full parametric equivalence with identical electrical specifications. Both are currently active and available in volume. The ACDBC340-HF (Comchip Technology) is also available but specifies a forward voltage of 550 mV @ 3 A, which is acceptable for applications with less stringent forward voltage requirements.

The 5822SMJ/TR13 (Microchip Technology) meets all voltage and current requirements but specifies a higher reverse leakage current of 1.5 mA @ 40 V compared to 500 µA @ 40 V for the original part. This part is suitable only for applications where reverse leakage current is not a critical design parameter.

Compliance Considerations

All recommended substitutes maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Automotive-grade qualification (AEC-Q101) is explicitly specified for SS34HE3_B/H, ACDBC340-HF, and the original SS34HE3_A/H. For automotive applications, these three parts are the preferred selections.

Frequently Asked Questions (FAQ)

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

A: Yes. The SS34HE3_B/H is electrically identical to the SS34HE3_A/H with the same 40 V reverse voltage, 3 A current rating, and 500 mV forward voltage specification. The primary difference is the extended maximum junction temperature (150°C vs. 125°C) and packaging format (Tape & Reel). Both parts are automotive-grade AEC-Q101 qualified and RoHS3 compliant.

Q: What is the difference between the various Vishay SS34 variants (SS34-E3/57T, SS34-M3/57T, SS34-3HE3/9AT)?

A: These variants are electrically identical with the same 40 V / 3 A specifications and 500 mV forward voltage. The differences are in packaging format and tape configuration. SS34-E3/57T is supplied in Cut Tape (CT), SS34-M3/57T in Cut Tape (CT) & Digi-Reel, and SS34-3HE3/9AT in Tape & Reel (TR). Selection should be based on your procurement and assembly process requirements.

Q: Is the Microchip 5822SMJ/TR13 a suitable substitute?

A: The 5822SMJ/TR13 meets the voltage and current requirements (40 V / 3 A) and forward voltage specification (500 mV @ 3 A). However, it specifies a reverse leakage current of 1.5 mA @ 40 V, which is three times higher than the original part's 500 µA @ 40 V specification. This part is suitable only for applications where reverse leakage current is not a critical design parameter.

Q: Can I use ACDBC340-HF as a substitute?

A: The ACDBC340-HF is functionally equivalent with 40 V / 3 A ratings and fast recovery characteristics. It specifies a forward voltage of 550 mV @ 3 A, which is 50 mV higher than the original 500 mV specification. This part is suitable for applications where the slightly higher forward voltage drop is acceptable. It carries automotive-grade AEC-Q101 qualification and RoHS3 compliance.

Q: Are all substitute parts available in the same DO-214AB (SMC) package?

A: Yes. All recommended substitute parts are supplied in the DO-214AB (SMC) surface mount package, ensuring mechanical and electrical compatibility with existing PCB designs. Packaging format differences (Cut Tape, Tape & Reel, Digi-Reel) refer to the supply method, not the component package itself.

Q: Which substitute should I choose for automotive applications?

A: For automotive applications, select from parts with explicit AEC-Q101 qualification: SS34HE3_B/H, ACDBC340-HF, or the original SS34HE3_A/H. The SS34HE3_B/H is the recommended choice as it is the direct successor from the original manufacturer with identical specifications and current production status.

Q: What is the significance of the RoHS3 compliance marking?

A: RoHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. All recommended substitutes carry RoHS3 compliance, ensuring regulatory compliance for applications subject to RoHS requirements.

Q: Can I mix different substitute part numbers in the same production run?

A: All recommended substitutes are electrically and mechanically equivalent within the specified parameters. However, mixing different manufacturer part numbers in the same production run may require separate qualification testing and documentation depending on your quality assurance procedures. Consult your design and quality documentation for specific requirements.

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