SS34HE3/9AT Equivalent & Substitute Parts

Part Overview

The SS34HE3/9AT 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 obsolete, necessitating identification of active equivalent and substitute components for ongoing production and design requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within the same application parameters.

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
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS34HE3/9AT is determined by strict equivalence across the following critical parameters:

Primary Substitution 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 acceptable tolerance)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 40 V (or lower)
Mounting Type: Surface Mount
Package / Case: DO-214AB, SMC
Operating Temperature - Junction: -55°C to 125°C (minimum)
RoHS Status: ROHS3 Compliant

Packaging Variants: Substitute parts are grouped by packaging format (Cut Tape, Tape & Reel, Digi-Reel) while maintaining identical electrical specifications. These variants are functionally equivalent and differ only in supply format.

Cross-Manufacturer Equivalents: Parts from alternative manufacturers (Micro Commercial Co, Comchip Technology, Microchip Technology) are included when all electrical parameters and package specifications match or exceed the original part requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Reverse Leakage @ Vr [µA @ V]	Package	Temp Range [°C]	Product Status	Packaging Format
SS34HE3/9AT	Vishay General Semiconductor	40	3	500 @ 3	500 @ 40	DO-214AB, SMC	-55 to 125	Obsolete	—
SS34-3HE3/9AT	Vishay General Semiconductor	40	3	500 @ 3	500 @ 40	DO-214AB, SMC	-55 to 125	Active	Tape & Reel (TR)
SS34-E3/57T	Vishay General Semiconductor	40	3	500 @ 3	500 @ 40	DO-214AB, SMC	-55 to 125	Active	Cut Tape (CT)
SS34-E3/9AT	Vishay General Semiconductor	40	3	500 @ 3	500 @ 40	DO-214AB, SMC	-55 to 125	Active	Tape & Reel (TR)
SS34-M3/57T	Vishay General Semiconductor	40	3	500 @ 3	500 @ 40	DO-214AB, SMC	-55 to 125	Active	Cut Tape (CT) & Digi-Reel®
SS34-M3/9AT	Vishay General Semiconductor	40	3	500 @ 3	500 @ 40	DO-214AB, SMC	-55 to 125	Active	Tape & Reel (TR)
SK34-TP	Micro Commercial Co	40	3	500 @ 3	500 @ 40	DO-214AB, SMC	-55 to 150	Active	Tape & Reel (TR)
SS34	MDD	40	3	—	500 @ 40	DO-214AC, SMA	-55 to 125	Active	—
5822SMJ/TR13	Microchip Technology	40	3	500 @ 3	1500 @ 40	DO-214AB, SMC	-55 to 150	Active	Tape & Reel (TR)
ACDBC340-HF	Comchip Technology	40	3	550 @ 3	500 @ 40	DO-214AB, SMC	-55 to 125	Active	Tape & Reel (TR)
CDBC340-G	Comchip Technology	40	3	500 @ 3	500 @ 40	DO-214AB, SMC	-55 to 125	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation - Vishay Parametric Equivalents: The SS34-E3/57T, SS34-E3/9AT, SS34-M3/57T, and SS34-M3/9AT are direct parametric equivalents manufactured by Vishay General Semiconductor. These parts maintain identical electrical specifications and are available in active product status with ROHS3 compliance. Selection between these variants depends on packaging format requirements: Cut Tape (CT) for SS34-E3/57T and SS34-M3/57T, or Tape & Reel (TR) for SS34-E3/9AT and SS34-M3/9AT.

Cross-Manufacturer Alternatives: The SK34-TP (Micro Commercial Co) and CDBC340-G (Comchip Technology) provide full parametric equivalence with identical electrical performance and DO-214AB packaging. Both are active products with ROHS3 compliance. The SK34-TP offers extended operating temperature range (-55°C to 150°C) compared to the original specification.

Conditional Substitutes: The 5822SMJ/TR13 (Microchip Technology) meets all primary electrical specifications but exhibits higher reverse leakage current (1.5 mA @ 40 V versus 500 µA @ 40 V). This part is suitable for applications where reverse leakage tolerance permits the higher specification. The ACDBC340-HF (Comchip Technology) is qualified to AEC-Q101 automotive standard with forward voltage of 550 mV @ 3 A, suitable for automotive applications with forward voltage tolerance.

Package Variant Consideration: The SS34 (MDD) in DO-214AC (SMA) package differs mechanically from the original DO-214AB (SMC) package and is classified as an upgrade option only when PCB layout accommodates the larger SMA footprint.

Frequently Asked Questions (FAQ)

Q: Can SS34-E3/57T replace SS34HE3/9AT directly? A: Yes. The SS34-E3/57T is a parametric equivalent with identical electrical specifications (40 V, 3 A, 500 mV forward voltage, 500 µA reverse leakage). The difference is packaging format: Cut Tape versus the original format. Both use DO-214AB (SMC) package and are ROHS3 compliant.

Q: What is the difference between SS34-E3/9AT and SS34-M3/9AT? A: Both parts are parametric equivalents with identical electrical specifications. The designation difference reflects internal Vishay product line variants. Both are available in Tape & Reel format with active product status.

Q: Is SK34-TP from Micro Commercial Co a suitable replacement? A: Yes. The SK34-TP meets all electrical requirements (40 V, 3 A, 500 mV forward voltage, 500 µA reverse leakage) and uses the same DO-214AB package. It offers extended temperature range (-55°C to 150°C) and is ROHS3 compliant.

Q: Why does 5822SMJ/TR13 have higher reverse leakage current? A: The 5822SMJ/TR13 specifies 1.5 mA reverse leakage @ 40 V compared to 500 µA for the original part. This represents a different manufacturing process or device variant. Substitution is valid only when circuit design tolerates the higher leakage specification.

Q: Can ACDBC340-HF be used in non-automotive applications? A: Yes. The ACDBC340-HF is AEC-Q101 qualified but functions in any application meeting its electrical specifications. The forward voltage is 550 mV @ 3 A (versus 500 mV for the original), which must be evaluated for circuit compatibility.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Cut Tape (CT) format provides individual component strips for manual or semi-automated assembly. Tape & Reel (TR) format provides continuous reel supply for high-speed automated assembly. Electrical specifications are identical; selection depends on assembly process requirements.

Q: Is the SS34 (MDD) in SMA package compatible? A: The SS34 (MDD) maintains identical electrical specifications but uses DO-214AC (SMA) package instead of DO-214AB (SMC). This is a larger footprint and requires PCB layout modification. Use only when mechanical constraints permit package change.

Q: Are all substitute parts ROHS3 compliant? A: All recommended substitutes except 5822SMJ/TR13 are ROHS3 compliant. The 5822SMJ/TR13 is RoHS non-compliant and should be selected only when RoHS compliance is not a requirement.

Q: What is Moisture Sensitivity Level (MSL) 1? A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All listed parts carry MSL 1 rating, ensuring no special storage or handling procedures are necessary.

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