SSL34HM6G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SSL34HM6G is a 40V, 3A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AB (SMC) surface mount package. This part is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and design requirements. The SSL34HM6G meets automotive-grade specifications with AEC-Q101 qualification and operates across a junction temperature range of -55°C to 125°C. Alternative parts must maintain electrical compatibility across voltage, current, and thermal parameters while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	410 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
Operating Temperature - Junction	-55 to 125	°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SSL34HM6G is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40V
Current - Average Rectified (Io): Must equal or exceed 3A
Voltage - Forward (Vf) (Max) @ If: Operating point at 3A current
Speed: Fast Recovery characteristic ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: Leakage at 40V reverse bias

Mechanical Compatibility Requirements:

Package / Case: DO-214AB (SMC) or equivalent surface mount packages (SMA, SMB acceptable with board layout adjustment)
Mounting Type: Surface Mount

Compliance & Qualification Requirements:

Technology: Schottky diode
RoHS Status: ROHS3 Compliant preferred for regulatory alignment
Grade: Automotive-grade preferred for consistency
Qualification: AEC-Q101 preferred for automotive applications

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and package specifications) and Functional Equivalents (matching electrical performance with alternative packaging or enhanced specifications).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Temp Range [°C]	RoHS	AEC-Q101
SSL34HM6G	Taiwan Semiconductor	40	3	410 @ 3A	500 @ 40V	DO-214AB (SMC)	-55 to 125	ROHS3	Yes
SSL34H	Taiwan Semiconductor	40	3	410 @ 3A	500 @ 40V	DO-214AB (SMC)	-55 to 125	ROHS3	Yes
5822SMJ/TR13	Microchip Technology	40	3	500 @ 3A	1500 @ 40V	DO-214AB	-55 to 150	Non-compliant	No
B340-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB (SMC)	-55 to 125	ROHS3	No
B340A-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AC (SMA)	-55 to 150	ROHS3	Yes
B340B-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AA (SMB)	-55 to 150	ROHS3	Yes
B340LA-13-F	Diodes Incorporated	40	3	450 @ 3A	2000 @ 40V	DO-214AC (SMA)	-55 to 125	ROHS3	No
B340LB-13-F	Diodes Incorporated	40	3	450 @ 3A	2000 @ 40V	DO-214AA (SMB)	-55 to 125	ROHS3	No
B340Q-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB (SMC)	-55 to 150	ROHS3	Yes
B540C-13-F	Diodes Incorporated	40	5	550 @ 5A	500 @ 40V	DO-214AB (SMC)	-55 to 150	ROHS3	No
B540CQ-13-F	Diodes Incorporated	40	5	550 @ 5A	500 @ 40V	DO-214AB (SMC)	-55 to 150	ROHS3	Yes

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

SSL34H (Taiwan Semiconductor Corporation) is the direct equivalent to SSL34HM6G. This part maintains identical electrical specifications (40V, 3A, 410mV forward voltage drop at 3A, 500µA reverse leakage), identical package (DO-214AB SMC), and identical compliance status (ROHS3, AEC-Q101). The SSL34H is currently active in production with 725 pieces in stock, providing immediate availability for design transitions.

Functional Equivalents with Same Package (DO-214AB SMC):

B340Q-13-F (Diodes Incorporated) provides functional equivalence in the same DO-214AB SMC package with automotive-grade AEC-Q101 qualification. This part operates across an extended temperature range (-55°C to 150°C versus -55°C to 125°C) and maintains ROHS3 compliance. Forward voltage is 500mV at 3A (versus 410mV), representing a 90mV increase in forward drop. Reverse leakage remains at 500µA at 40V. This part is active with 18,040 pieces in stock.

Functional Equivalents with Alternative Packages:

B340A-13-F and B340B-13-F (Diodes Incorporated) provide equivalent electrical performance in SMA (DO-214AC) and SMB (DO-214AA) packages respectively. Both maintain 40V/3A ratings, ROHS3 compliance, and AEC-Q101 qualification with extended temperature range (-55°C to 150°C). These alternatives require board layout modification to accommodate different package footprints. B340A-13-F has 335,400 pieces in stock; B340LB-13-F has 71,300 pieces in stock.

Higher Current Alternatives:

B540C-13-F and B540CQ-13-F (Diodes Incorporated) provide 40V/5A capability in DO-214AB SMC package. These parts exceed the 3A current requirement and are suitable for applications requiring current margin. B540CQ-13-F includes AEC-Q101 qualification. Forward voltage at 5A is 550mV. These parts are active with 149,832 and 26,100 pieces in stock respectively.

Non-Recommended Alternatives:

5822SMJ/TR13 (Microchip Technology) does not meet compliance requirements (RoHS non-compliant, no AEC-Q101 qualification) and exhibits elevated reverse leakage (1500µA at 40V versus 500µA). This part is not suitable for automotive or regulated applications.

B340LA-13-F and B340LB-13-F exhibit elevated reverse leakage (2000µA at 40V) and lack AEC-Q101 qualification, limiting suitability for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can SSL34H be used as a direct replacement for SSL34HM6G?

A: Yes. SSL34H is the direct equivalent with identical electrical specifications (40V, 3A, 410mV Vf @ 3A, 500µA reverse leakage), identical DO-214AB SMC package, and identical compliance status (ROHS3, AEC-Q101). No circuit modifications are required.

Q: What is the difference between SSL34HM6G and B340Q-13-F?

A: Both parts meet 40V/3A electrical requirements in DO-214AB SMC package with ROHS3 compliance and AEC-Q101 qualification. B340Q-13-F has a forward voltage of 500mV at 3A (versus 410mV for SSL34HM6G), representing a 90mV increase. B340Q-13-F operates to 150°C junction temperature versus 125°C. The higher forward voltage results in increased power dissipation in the diode.

Q: Can B340A-13-F or B340B-13-F be used as substitutes?

A: These parts provide electrical equivalence (40V, 3A, 500mV Vf @ 3A) with ROHS3 compliance and AEC-Q101 qualification. However, they use different packages: B340A-13-F uses SMA (DO-214AC) and B340B-13-F uses SMB (DO-214AA). Board layout modification is required to accommodate the different footprints. Both operate to 150°C junction temperature.

Q: Why is 5822SMJ/TR13 not recommended?

A: The 5822SMJ/TR13 does not meet regulatory requirements for automotive applications. It is RoHS non-compliant and lacks AEC-Q101 qualification. Additionally, reverse leakage is elevated at 1500µA at 40V compared to 500µA for the SSL34HM6G, indicating higher leakage current and potential reliability concerns.

Q: Can B540C-13-F or B540CQ-13-F be used as substitutes?

A: These parts are rated for 40V/5A, exceeding the 3A requirement of SSL34HM6G. They maintain the same DO-214AB SMC package and ROHS3 compliance. B540CQ-13-F includes AEC-Q101 qualification. Forward voltage at 5A is 550mV. These parts are suitable for applications requiring higher current capacity or design margin, but they are not direct replacements due to higher current rating and forward voltage specifications.

Q: What is the impact of forward voltage differences between substitute parts?

A: Forward voltage directly affects power dissipation in the diode. SSL34HM6G specifies 410mV at 3A, while most Diodes Incorporated alternatives specify 500mV at 3A. At 3A, this represents an additional 270mW of power dissipation (90mV × 3A). Thermal design and heat dissipation capability must accommodate this difference. B340LA-13-F and B340LB-13-F specify 450mV at 3A, representing 120mW additional dissipation.

Q: Are there packaging considerations when selecting substitutes?

A: Yes. SSL34HM6G uses DO-214AB (SMC) package. Direct substitutes (SSL34H, B340Q-13-F) use the same package and require no board modification. Alternative packages include SMA (DO-214AC) for B340A-13-F and SMB (DO-214AA) for B340B-13-F. Different packages have different footprints, pad layouts, and thermal characteristics. Board layout modification is required for alternative packages.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is the automotive electronics council qualification standard for discrete semiconductors. It specifies reliability, quality, and performance requirements for automotive applications. Parts with AEC-Q101 qualification meet automotive industry standards for temperature cycling, moisture resistance, and electrical performance. SSL34HM6G and recommended substitutes (SSL34H, B340A-13-F, B340B-13-F, B340Q-13-F, B540CQ-13-F) carry this qualification.

Q: What is the significance of operating temperature range differences?

A: SSL34HM6G operates from -55°C to 125°C junction temperature. Several substitutes (B340A-13-F, B340B-13-F, B340Q-13-F, B540C-13-F, B540CQ-13-F) extend to 150°C. Extended temperature range provides design margin for high-temperature applications but does not affect performance at the SSL34HM6G operating range. Applications limited to -55°C to 125°C operation do not require the extended range.

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