SS34HM3_A/H Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34HM3_A/H 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 ROHS3 compliance. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers and part variants.

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	µA
Technology	Schottky	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°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/H are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Mandatory Matching Parameters:

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 (surface mount)
Mounting Type: Surface Mount
Technology: Schottky

Parametric Equivalent Classification: Parts meeting all mandatory parameters with identical electrical specifications and automotive-grade qualification (AEC-Q101) where applicable.

Similar Classification: Parts meeting all mandatory parameters with minor variations in secondary characteristics such as reverse leakage current or capacitance, or with different operating temperature maximums.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Grade	Tj (Max) [°C]	Inventory [Pcs]
SS34HM3_A/H	Vishay General Semiconductor	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Automotive	150	1067
SS34HE3_B/H	Vishay General Semiconductor	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Automotive	150	8144
SS34HE3_B/I	Vishay General Semiconductor	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Automotive	150	5409
CDBC340-G	Comchip Technology	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	—	125	3700
5822SMJE3/TR13	Microchip Technology	40	3	500 @ 3A	1500 @ 40V	DO-214AB, SMC	—	150	6550
B340CE-13	Diodes Incorporated	40	3	500 @ 3A	200 @ 40V	DO-214AB, SMC	—	150	4300
B340Q-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Automotive	150	18040
SK34-AU_R1_000A1	Panjit International Inc.	40	3	500 @ 3A	200 @ 40V	DO-214AB, SMC	Automotive	150	1256
SK34-TP	Micro Commercial Co	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	—	150	2400
SK34_R1_00001	Panjit International Inc.	40	3	500 @ 3A	200 @ 40V	DO-214AB, SMC	—	150	53300
SS34	MDD	40	3	—	500 @ 40V	DO-214AC, SMA	—	125	605100

Engineering Selection Recommendations

Automotive-Grade Equivalents (AEC-Q101 Qualified):

Parts SS34HE3_B/H, SS34HE3_B/I, B340Q-13-F, SK34-AU_R1_000A1, and the main part SS34HM3_A/H all carry automotive-grade qualification and AEC-Q101 certification. These parts are suitable for applications requiring automotive compliance and are interchangeable from an electrical and mechanical standpoint. Selection among these should be based on inventory availability and supply chain considerations.

Non-Automotive Alternatives:

Parts CDBC340-G, 5822SMJE3/TR13, B340CE-13, SK34-TP, and SK34_R1_00001 meet the core electrical parameters but lack automotive-grade designation. These are suitable for non-automotive applications where AEC-Q101 qualification is not required. CDBC340-G and SS34 operate at a maximum junction temperature of 125°C, compared to 150°C for the main part, which may impact thermal margin in high-temperature environments.

Package Consideration:

Part SS34 uses DO-214AC (SMA) package instead of DO-214AB (SMC). While both are surface mount packages, they have different footprints and are not mechanically interchangeable on the same PCB layout.

Reverse Leakage Variation:

Part 5822SMJE3/TR13 exhibits higher reverse leakage current (1.5 mA @ 40V) compared to the main part (500 µA @ 40V). This difference may be significant in low-leakage applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute SS34HE3_B/H for SS34HM3_A/H in an automotive application?

A: Yes. Both parts are manufactured by Vishay General Semiconductor, carry AEC-Q101 qualification, and share identical electrical specifications (40V, 3A, 500mV forward voltage, DO-214AB package). They are parametric equivalents suitable for direct substitution in automotive designs.

Q: What is the difference between DO-214AB (SMC) and DO-214AC (SMA) packages?

A: DO-214AB and DO-214AC are distinct surface mount package outlines with different physical dimensions and PCB footprints. Part SS34 uses DO-214AC (SMA), while the main part uses DO-214AB (SMC). These packages are not mechanically interchangeable and require different PCB layouts.

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

A: Yes. B340Q-13-F is manufactured by Diodes Incorporated, carries AEC-Q101 qualification, and meets all electrical parameters of the main part. It is suitable for automotive applications.

Q: Why does 5822SMJE3/TR13 have higher reverse leakage current?

A: Reverse leakage current (1.5 mA @ 40V) is higher than the main part (500 µA @ 40V). This is a characteristic difference between manufacturers and part variants. Selection should consider application requirements for leakage performance.

Q: Can I use SK34_R1_00001 in place of SS34HM3_A/H?

A: SK34_R1_00001 meets all core electrical parameters and operates within the same temperature range. However, it lacks automotive-grade qualification. Use is appropriate for non-automotive applications only.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: Moisture Sensitivity Level 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All listed parts share this rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference carry ROHS3 compliance status, meeting regulatory requirements for hazardous substance restrictions.

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