SSL34 M6G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SSL34 M6G is a 40V, 3A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in the DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, creating a requirement for equivalent alternatives that maintain electrical and mechanical compatibility. The SSL34 M6G operates across a junction temperature range of -55°C to 125°C and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	410 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SSL34 M6G is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 3 A minimum
Technology: Schottky rectifier
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Compatibility Requirements:

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

Compliance Requirements:

RoHS3 Compliant status preferred for regulatory alignment
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories:

Direct Substitutes (Identical Package - DO-214AB SMC): Parts maintaining the exact DO-214AB SMC package footprint with matching electrical specifications.

Functional Equivalents (Alternative Packages - SMA/SMB): Parts with identical electrical ratings but different surface mount packages (SMA or SMB), requiring PCB layout modification but providing electrical equivalence.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package / Case	Reverse Leakage @ Vr	Operating Temp (Junction)	Product Status	RoHS Status
SSL34 M6G	Taiwan Semiconductor Corporation	40 V	3 A	410 mV @ 3 A	DO-214AB, SMC	500 µA @ 40 V	-55°C ~ 125°C	Discontinued	RoHS3 Compliant
B340-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	500 µA @ 40 V	-55°C ~ 125°C	Active	RoHS3 Compliant
B340Q-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	500 µA @ 40 V	-55°C ~ 150°C	Active	RoHS3 Compliant
CDBC340-G	Comchip Technology	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	500 µA @ 40 V	-55°C ~ 125°C	Active	RoHS3 Compliant
5822SMJ/TR13	Microchip Technology	40 V	3 A	500 mV @ 3 A	DO-214AB, SMC	1.5 mA @ 40 V	-55°C ~ 150°C	Active	RoHS Non-compliant
B340A-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	DO-214AC, SMA	500 µA @ 40 V	-55°C ~ 150°C	Active	RoHS3 Compliant
B340LA-13-F	Diodes Incorporated	40 V	3 A	450 mV @ 3 A	DO-214AC, SMA	2 mA @ 40 V	-55°C ~ 125°C	Active	RoHS3 Compliant
B340B-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	DO-214AA, SMB	500 µA @ 40 V	-55°C ~ 150°C	Active	RoHS3 Compliant
B340LB-13-F	Diodes Incorporated	40 V	3 A	450 mV @ 3 A	DO-214AA, SMB	2 mA @ 40 V	-55°C ~ 125°C	Active	RoHS3 Compliant
B540C-13-F	Diodes Incorporated	40 V	5 A	550 mV @ 5 A	DO-214AB, SMC	500 µA @ 40 V	-55°C ~ 150°C	Active	RoHS3 Compliant
B540CQ-13-F	Diodes Incorporated	40 V	5 A	550 mV @ 5 A	DO-214AB, SMC	500 µA @ 40 V	-55°C ~ 150°C	Active	RoHS3 Compliant

Engineering Selection Recommendations

Primary Direct Substitutes (DO-214AB SMC Package):

The B340-13-F (Diodes Incorporated) and CDBC340-G (Comchip Technology) are direct pin-compatible replacements for the SSL34 M6G. Both maintain the DO-214AB SMC package, 40V reverse voltage rating, and 3A average rectified current. Both are RoHS3 compliant and active products with established supply chains. The B340-13-F offers extended junction temperature range (-55°C to 150°C) compared to the SSL34 M6G (-55°C to 125°C), providing additional thermal margin. The B340Q-13-F variant is identical to B340-13-F but supplied on tape and reel, suitable for automated assembly processes.

Secondary Direct Substitutes (DO-214AB SMC Package):

The 5822SMJ/TR13 (Microchip Technology) meets all electrical specifications but carries RoHS non-compliant status, making it unsuitable for applications requiring regulatory compliance. This part is listed for reference only and should not be selected for new designs.

Functional Equivalents (Alternative Packages):

The B340A-13-F (SMA package) and B340B-13-F (SMB package) provide electrical equivalence with the SSL34 M6G but require PCB layout modification due to different package footprints. These alternatives are suitable when PCB redesign is acceptable. The B340LA-13-F and B340LB-13-F variants offer lower forward voltage (450 mV @ 3A) and extended temperature range, providing performance advantages in thermally constrained applications.

Higher Current Alternative:

The B540C-13-F and B540CQ-13-F (5A rated) maintain the DO-214AB SMC package and 40V rating but exceed the 3A current specification. These parts are suitable only when higher current capacity is required and the application can tolerate increased forward voltage drop (550 mV @ 5A).

Compliance Considerations:

All recommended substitutes maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices. The extended operating temperature range of B340-13-F and B340Q-13-F (-55°C to 150°C) provides additional design margin over the original SSL34 M6G specification.

Frequently Asked Questions (FAQ)

Q: Can B340-13-F directly replace SSL34 M6G without PCB modification?

A: Yes. The B340-13-F is a direct pin-compatible replacement in the DO-214AB SMC package. No PCB layout changes are required. Both parts share identical package footprints, pin assignments, and mounting requirements.

Q: What is the difference between B340-13-F and B340Q-13-F?

A: Both parts are electrically and mechanically identical. The primary difference is packaging format: B340-13-F is supplied in cut tape and digi-reel format, while B340Q-13-F is supplied on tape and reel. Selection depends on assembly process requirements. B340Q-13-F is preferred for automated pick-and-place assembly.

Q: Why is the forward voltage specification different between SSL34 M6G (410 mV) and B340-13-F (500 mV)?

A: Forward voltage variation within the 40V/3A Schottky diode category is normal and reflects manufacturing process differences between Taiwan Semiconductor Corporation and Diodes Incorporated. The 90 mV difference is within acceptable tolerance for most applications. Verify forward voltage requirements in your specific circuit design before selection.

Q: Can I use B340A-13-F (SMA package) instead of B340-13-F (SMC package)?

A: B340A-13-F provides electrical equivalence but requires PCB redesign due to different package footprint (DO-214AC SMA vs. DO-214AB SMC). Use this alternative only when PCB layout modification is acceptable. Mechanical compatibility cannot be assumed without footprint verification.

Q: Is the 5822SMJ/TR13 (Microchip) suitable for new designs?

A: No. The 5822SMJ/TR13 is RoHS non-compliant, making it unsuitable for applications requiring regulatory compliance. Additionally, reverse leakage current is specified at 1.5 mA @ 40V, compared to 500 µA for the SSL34 M6G, indicating different device characteristics. This part should not be selected for new designs.

Q: What is the advantage of B340LA-13-F over B340A-13-F?

A: The B340LA-13-F offers lower forward voltage (450 mV @ 3A vs. 500 mV) and lower reverse leakage current (2 mA vs. 500 µA), providing improved efficiency in power conversion applications. However, it operates at -55°C to 125°C (vs. -55°C to 150°C for B340A-13-F). Selection depends on thermal and efficiency requirements.

Q: Can B540C-13-F (5A rated) be used in place of SSL34 M6G (3A rated)?

A: B540C-13-F maintains the 40V rating and DO-214AB SMC package, providing mechanical compatibility. However, the 5A current rating and higher forward voltage (550 mV @ 5A) indicate different device characteristics. Use this part only when higher current capacity is required. Verify that increased forward voltage drop does not impact circuit performance.

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 not be selected for applications requiring regulatory compliance.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: All substitute parts listed maintain MSL 1 (Unlimited), identical to the SSL34 M6G. This rating indicates no moisture sensitivity restrictions and compatibility with standard storage and handling practices.

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