SSL34 R7G Schottky Diode 40V 3A Equivalent & Substitute Parts

Part Overview

The SSL34 R7G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 3A average rectified current in a DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. The part operates across a junction temperature range of -55°C to 125°C and maintains ROHS3 compliance with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Maximum @ If	410	mV @ 3A
Current - Reverse Leakage @ Vr	500	µA @ 40V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SSL34 R7G is determined by strict electrical and mechanical parameter matching within the Schottky diode rectifier category. The primary substitution criteria are:

Electrical Parameters (Mandatory Match):

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

Mechanical Parameters (Package Compatibility):

Mounting Type: Surface Mount
Package / Case: DO-214AB (SMC) for direct substitution; DO-214AC (SMA) and DO-214AA (SMB) for package-variant substitution

Compliance Parameters:

RoHS Status: ROHS3 Compliant 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 same package footprint and electrical specifications, enabling drop-in replacement without PCB modification.

Package-Variant Substitutes (SMA/SMB Packages): Parts with identical electrical ratings but different surface mount packages (DO-214AC/SMA or DO-214AA/SMB), requiring PCB layout adjustment but maintaining electrical compatibility.

Higher Current Variants (5A Rating): Parts with elevated current ratings (B540C-13-F, B540CQ-13-F) that exceed the 3A specification and are listed for reference in applications requiring increased current capacity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV @ If	Ir @ Vr µA	Package	Product Status	RoHS	Tj (°C)
SSL34 R7G	Taiwan Semiconductor Corporation	40	3	410 @ 3A	500 @ 40V	DO-214AB (SMC)	Discontinued	ROHS3	-55 to 125
B340-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB (SMC)	Active	ROHS3	-55 to 125
B340Q-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB (SMC)	Active	ROHS3	-55 to 150
5822SMJ/TR13	Microchip Technology	40	3	500 @ 3A	1500 @ 40V	DO-214AB (SMC)	Active	RoHS Non-Compliant	-55 to 150
CDBC340-G	Comchip Technology	40	3	500 @ 3A	500 @ 40V	DO-214AB (SMC)	Active	ROHS3	-55 to 125
B340A-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AC (SMA)	Active	ROHS3	-55 to 150
B340LA-13-F	Diodes Incorporated	40	3	450 @ 3A	2000 @ 40V	DO-214AC (SMA)	Active	ROHS3	-55 to 125
B340B-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AA (SMB)	Active	ROHS3	-55 to 150
B340LB-13-F	Diodes Incorporated	40	3	450 @ 3A	2000 @ 40V	DO-214AA (SMB)	Active	ROHS3	-55 to 125
B540C-13-F	Diodes Incorporated	40	5	550 @ 5A	500 @ 40V	DO-214AB (SMC)	Active	ROHS3	-55 to 150
B540CQ-13-F	Diodes Incorporated	40	5	550 @ 5A	500 @ 40V	DO-214AB (SMC)	Active	ROHS3	-55 to 150

Engineering Selection Recommendations

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

The B340-13-F and B340Q-13-F from Diodes Incorporated are the preferred direct substitutes for the SSL34 R7G. Both maintain identical electrical specifications (40V, 3A, DO-214AB/SMC package) and ROHS3 compliance. The B340Q-13-F offers extended junction temperature range (-55°C to 150°C) and carries AEC-Q101 automotive qualification, providing enhanced reliability for temperature-sensitive applications. Both parts are in active production status with substantial inventory availability.

The CDBC340-G from Comchip Technology provides an alternative direct substitute with matching electrical and package specifications, ROHS3 compliance, and active product status. This part is suitable for applications without automotive qualification requirements.

The 5822SMJ/TR13 from Microchip Technology matches the electrical and package specifications but carries RoHS non-compliance status and exhibits elevated reverse leakage current (1500 µA @ 40V versus 500 µA @ 40V for the main part). This part is not recommended for new designs requiring ROHS3 compliance.

Package-Variant Substitutes (SMA/SMB Packages):

The B340A-13-F (DO-214AC/SMA) and B340B-13-F (DO-214AA/SMB) from Diodes Incorporated provide electrical equivalence with package variants. These parts require PCB layout modification to accommodate different footprints but maintain 40V/3A ratings and ROHS3 compliance. The B340A-13-F and B340B-13-F both extend the junction temperature range to -55°C to 150°C and include AEC-Q101 automotive qualification.

The B340LA-13-F (SMA) and B340LB-13-F (SMB) variants offer reduced forward voltage (450 mV @ 3A versus 410-500 mV) but exhibit elevated reverse leakage current (2000 µA @ 40V). These parts maintain ROHS3 compliance and active production status.

Higher Current Variants:

The B540C-13-F and B540CQ-13-F are 5A-rated Schottky diodes in DO-214AB/SMC packages. These parts exceed the 3A specification of the SSL34 R7G and are listed for applications requiring increased current capacity beyond the original design specification. Both maintain ROHS3 compliance and AEC-Q101 automotive qualification.

Compliance and Regulatory Considerations:

All recommended primary substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level, aligning with the original part's regulatory status. Parts carrying AEC-Q101 automotive qualification provide additional assurance for mission-critical applications. The 5822SMJ/TR13 should be excluded from new designs due to RoHS non-compliance.

Frequently Asked Questions (FAQ)

Q: Can the B340-13-F directly replace the SSL34 R7G without PCB modification?

A: Yes. The B340-13-F maintains identical electrical specifications (40V, 3A, Schottky technology, fast recovery speed) and package configuration (DO-214AB/SMC). Both parts are surface mount components with matching footprints, enabling drop-in replacement without PCB layout changes.

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

A: Both parts share identical electrical ratings (40V, 3A) and package type (DO-214AB/SMC). The B340Q-13-F extends the maximum junction temperature from 125°C to 150°C and includes AEC-Q101 automotive qualification. Selection depends on application temperature requirements and automotive certification needs.

Q: Why is the 5822SMJ/TR13 not recommended as a substitute?

A: While the 5822SMJ/TR13 matches the electrical specifications and package type, it carries RoHS non-compliance status, which conflicts with the original part's ROHS3 compliance. Additionally, the reverse leakage current is elevated to 1500 µA @ 40V compared to 500 µA @ 40V for the SSL34 R7G, indicating different device characteristics that may affect circuit performance.

Q: Can I use the B340A-13-F (SMA package) instead of the SSL34 R7G (SMC package)?

A: The B340A-13-F is electrically equivalent (40V, 3A, Schottky, fast recovery) but uses a different surface mount package (DO-214AC/SMA versus DO-214AB/SMC). This substitution requires PCB layout modification to accommodate the different footprint. Electrical compatibility is maintained, but physical board redesign is necessary.

Q: What is the significance of the forward voltage difference between parts?

A: The SSL34 R7G specifies 410 mV forward voltage @ 3A, while most substitute parts specify 500 mV @ 3A. This 90 mV difference represents normal manufacturing variation within the Schottky diode category. The B340LA-13-F and B340LB-13-F offer 450 mV @ 3A, providing an intermediate specification. Forward voltage differences affect power dissipation and heat generation; applications with tight thermal budgets should account for this parameter variation.

Q: Are the B540C-13-F and B540CQ-13-F suitable replacements for the SSL34 R7G?

A: The B540C-13-F and B540CQ-13-F are not direct substitutes; they are rated for 5A average rectified current versus the 3A specification of the SSL34 R7G. These parts are suitable only for applications requiring higher current capacity than the original design. They maintain the same 40V reverse voltage rating and DO-214AB/SMC package, but the elevated current rating introduces different electrical characteristics.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, restricting the use of specific hazardous materials including lead, cadmium, mercury, and certain flame retardants. The SSL34 R7G and all recommended primary substitutes maintain ROHS3 compliance, ensuring regulatory alignment for applications subject to environmental and safety standards.

Q: Why do some parts specify AEC-Q101 qualification?

A: AEC-Q101 is an automotive electronics qualification standard that establishes reliability and performance requirements for semiconductor components used in automotive applications. Parts carrying this qualification (B340Q-13-F, B340A-13-F, B340B-13-F, B540CQ-13-F) have undergone additional testing and validation for automotive-grade reliability. This qualification is optional for non-automotive applications but provides enhanced assurance for mission-critical designs.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) and Digi-Reel® packaging refers to components supplied on continuous tape that can be cut to length for manual or semi-automated assembly. Tape & Reel (TR) packaging supplies components on full reels for high-volume automated assembly. Both packaging formats contain identical components; the difference is in supply format and handling for production processes. Selection depends on manufacturing volume and assembly equipment capabilities.

Q: Can I use the B340LB-13-F (SMB package) if my PCB has SMC footprints?

A: No. The B340LB-13-F uses a DO-214AA (SMB) package footprint, which is physically incompatible with DO-214AB (SMC) footprints. While electrically equivalent, the different package dimensions prevent mechanical fit on the original PCB. PCB redesign or use of a package-compatible substitute (B340-13-F or B340Q-13-F in SMC) is required.

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