SS34HM3_A/I Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34HM3_A/I is a 40V, 3A Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division in DO-214AB (SMC) surface mount package. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers while preserving the same functional application requirements.

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	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Technology	Schottky	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SS34HM3_A/I are classified based on strict electrical and mechanical parameter equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

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)
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Technology: Schottky

Parametric Equivalent Classification: Parts meeting all critical electrical parameters and package specifications with identical or compatible operating temperature ranges and compliance certifications.

Similar Classification: Parts meeting all critical electrical parameters and package specifications with minor variations in operating temperature range or reverse leakage current specifications that remain within acceptable application tolerances.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Temp Range [°C]	Grade	AEC-Q101
SS34HM3_A/I	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 150	Automotive	Yes
SS34HE3_B/H	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 150	Automotive	Yes
SS34HE3_B/I	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 150	Automotive	Yes
CDBC340-G	Comchip Technology	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 125	—	—
5822SMJE3/TR13	Microchip Technology	40	3	500 @ 3A	1500 @ 40V	DO-214AB, SMC	-55 to 150	—	—
B340CE-13	Diodes Incorporated	40	3	500 @ 3A	200 @ 40V	DO-214AB, SMC	-55 to 150	—	—
B340Q-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 150	Automotive	Yes
SK34-AU_R1_000A1	Panjit International Inc.	40	3	500 @ 3A	200 @ 40V	DO-214AB, SMC	-55 to 150	Automotive	Yes
SK34-TP	Micro Commercial Co	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	-55 to 150	—	—
SK34_R1_00001	Panjit International Inc.	40	3	500 @ 3A	200 @ 40V	DO-214AB, SMC	-55 to 150	—	—
SS34	MDD	40	3	500 @ 3A	500 @ 40V	DO-214AC, SMA	-55 to 125	—	—

Engineering Selection Recommendations

Automotive-Grade Equivalents (AEC-Q101 Qualified):

Parts SS34HE3_B/H, SS34HE3_B/I, B340Q-13-F, SK34-AU_R1_000A1, and SK34-TP maintain full automotive qualification and AEC-Q101 certification. These parts are suitable for applications requiring automotive-grade reliability and traceability. SS34HE3_B/H and SS34HE3_B/I are manufactured by the same supplier (Vishay) as the primary part and provide identical electrical and thermal specifications.

Non-Automotive Alternatives:

Parts CDBC340-G, 5822SMJE3/TR13, B340CE-13, SK34_R1_00001, and SS34 meet the core electrical specifications but lack automotive-grade certification or AEC-Q101 qualification. These parts are suitable for non-automotive applications where automotive qualification is not required. CDBC340-G operates at a maximum junction temperature of 125°C compared to 150°C for the primary part. SS34 uses a different package (DO-214AC, SMA) instead of DO-214AB (SMC) and operates at a maximum junction temperature of 125°C.

Reverse Leakage Considerations:

The primary part SS34HM3_A/I specifies 500 µA reverse leakage at 40V. Parts B340CE-13, SK34-AU_R1_000A1, and SK34_R1_00001 specify 200 µA reverse leakage, representing lower leakage performance. Part 5822SMJE3/TR13 specifies 1500 µA reverse leakage, representing higher leakage performance. Selection should account for application-specific leakage requirements.

Packaging Compatibility:

All substitute parts except SS34 maintain the DO-214AB (SMC) package specification. SS34 uses DO-214AC (SMA) package and is not mechanically compatible with DO-214AB footprints.

Frequently Asked Questions (FAQ)

Q: Can SS34HE3_B/H and SS34HE3_B/I be used interchangeably with SS34HM3_A/I?

A: Yes. Both parts are manufactured by Vishay and meet identical electrical specifications: 40V reverse voltage, 3A average rectified current, 500mV forward voltage at 3A, and fast recovery speed. Both maintain automotive-grade qualification and AEC-Q101 certification with operating temperature range of -55°C to 150°C. The parts differ only in packaging designation (tape reel variants).

Q: Is B340Q-13-F a suitable replacement for automotive applications?

A: Yes. B340Q-13-F is manufactured by Diodes Incorporated and carries automotive-grade qualification with AEC-Q101 certification. It meets all critical electrical parameters: 40V reverse voltage, 3A average rectified current, 500mV forward voltage at 3A, and fast recovery speed. Operating temperature range is -55°C to 150°C, matching the primary part.

Q: Why does CDBC340-G have a lower maximum junction temperature?

A: CDBC340-G is manufactured by Comchip Technology with a maximum junction temperature of 125°C, compared to 150°C for the primary part. This represents a design or manufacturing difference. Applications operating near the upper temperature limit may require verification of thermal performance with this substitute.

Q: Can SS34 (SMA package) replace SS34HM3_A/I (SMC package)?

A: No. SS34 uses DO-214AC (SMA) package while SS34HM3_A/I uses DO-214AB (SMC) package. These packages have different physical dimensions and footprints and are not mechanically compatible. Additionally, SS34 operates at a maximum junction temperature of 125°C versus 150°C for the primary part.

Q: What is the difference between parametric equivalent and similar classification?

A: Parametric equivalent parts meet all critical electrical specifications and package requirements with identical or fully compatible operating parameters. Similar parts meet core electrical specifications but may have variations in operating temperature range, reverse leakage current, or other secondary parameters that remain within acceptable application tolerances.

Q: Does 5822SMJE3/TR13 have higher reverse leakage than the primary part?

A: Yes. 5822SMJE3/TR13 specifies 1500 µA reverse leakage at 40V, compared to 500 µA for SS34HM3_A/I. This represents three times higher leakage current. Applications sensitive to leakage current performance should account for this difference in thermal or power dissipation calculations.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed meet ROHS3 compliance requirements. All parts also maintain MSL 1 (Unlimited) moisture sensitivity level and REACH Unaffected status.

Q: Which substitute offers the best availability?

A: SK34_R1_00001 manufactured by Panjit International Inc. has the highest inventory level at 53,300 pieces. B340Q-13-F manufactured by Diodes Incorporated has 18,040 pieces in stock. Both represent high-availability alternatives.

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