SSL32 R7G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SSL32 R7G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 20 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain electrical performance within the specified voltage, current, and thermal operating ranges while accommodating packaging and compliance requirements of the target application.

Key Parameters

Parameter	SSL32 R7G
Voltage - DC Reverse (Vr) (Max)	20 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	200 µA @ 20 V
Package / Case	DO-214AB, SMC
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SSL32 R7G is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 20 V
Current - Average Rectified (Io): 3 A
Technology: Schottky
Package / Case: DO-214AB or SMC equivalent
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitute values up to 500 mV @ 3 A are acceptable
Current - Reverse Leakage @ Vr: Substitute values up to 1.5 mA @ 20 V are acceptable
Operating Temperature - Junction: Substitute range must encompass or exceed -55°C to 125°C minimum
RoHS Status: ROHS3 Compliant preferred; RoHS non-compliant parts require application review

Substitute parts are grouped by package type (SMC, SMA, SMB) and manufacturer compliance certifications. Parts with higher voltage ratings (70 V) or current ratings (5 A) are listed for reference but do not constitute direct substitutes due to parameter mismatch.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Tj (Operating)	RoHS Status	Product Status
SSL32 R7G	Taiwan Semiconductor Corporation	20 V	3 A	410 mV @ 3 A	DO-214AB, SMC	-55°C ~ 125°C	ROHS3 Compliant	Discontinued
5820SMJ/TR13	Microchip Technology	20 V	3 A	460 mV @ 3 A	DO-214AB	-55°C ~ 150°C	RoHS Non-compliant	Active
5820SMJE3/TR13	Microchip Technology	20 V	3 A	460 mV @ 3 A	DO-214AB	-55°C ~ 150°C	ROHS3 Compliant	Active
B320-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-55°C ~ 125°C	ROHS3 Compliant	Active
B320A-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	DO-214AC, SMA	-55°C ~ 150°C	ROHS3 Compliant	Active
B320B-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	DO-214AA, SMB	-55°C ~ 150°C	ROHS3 Compliant	Active
B320Q-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	-55°C ~ 150°C	ROHS3 Compliant	Active
CDBC320-HF	Comchip Technology	20 V	3 A	450 mV @ 3 A	DO-214AB, SMC	-50°C ~ 150°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Substitutes (Identical Package, Active Status, ROHS3 Compliant):

The B320Q-13-F (Diodes Incorporated) and CDBC320-HF (Comchip Technology) are direct substitutes for the SSL32 R7G in DO-214AB (SMC) package configurations. Both parts maintain 20 V / 3 A electrical specifications, ROHS3 compliance, and surface mount compatibility. The B320Q-13-F extends operating temperature to -55°C ~ 150°C and includes AEC-Q101 automotive qualification. The CDBC320-HF provides comparable performance with forward voltage of 450 mV @ 3 A, matching the SSL32 R7G specification more closely than the B320Q-13-F at 500 mV @ 3 A.

Secondary Substitutes (Identical Electrical Specifications, Alternative Packages):

The B320-13-F (SMC package, Diodes Incorporated) and 5820SMJE3/TR13 (DO-214AB, Microchip Technology) provide equivalent electrical performance with ROHS3 compliance and active product status. The 5820SMJE3/TR13 offers extended temperature range (-55°C ~ 150°C) and higher inventory availability (1137 pcs). The B320A-13-F and B320B-13-F variants accommodate applications requiring SMA or SMB package formats while maintaining electrical equivalence.

Non-Compliant Alternative:

The 5820SMJ/TR13 (Microchip Technology) matches electrical specifications and package type but carries RoHS non-compliant status. This part is suitable only for applications exempt from RoHS requirements.

Parts Not Recommended as Direct Substitutes:

The B370Q-13-F (70 V rating) and B520CQ-13-F / B520C-13-F (5 A rating) exceed the SSL32 R7G electrical specifications and are not direct substitutes, though they may serve applications requiring higher voltage or current margins.

Frequently Asked Questions (FAQ)

Q: Can the B320Q-13-F replace the SSL32 R7G in existing PCB designs?

A: Yes. The B320Q-13-F maintains identical voltage (20 V) and current (3 A) ratings, Schottky technology, and DO-214AB (SMC) package footprint. Forward voltage increases from 410 mV to 500 mV @ 3 A, which is within acceptable design margins for most applications. Extended operating temperature (-55°C ~ 150°C) and AEC-Q101 qualification provide additional design flexibility.

Q: What is the difference between B320-13-F and B320Q-13-F?

A: Both parts share identical electrical specifications (20 V / 3 A) and SMC packaging. The B320Q-13-F includes AEC-Q101 automotive qualification and extends operating temperature to 150°C, compared to 125°C for the B320-13-F. Selection depends on application requirements for automotive-grade certification and thermal performance.

Q: Is the CDBC320-HF suitable for high-temperature applications?

A: The CDBC320-HF operates from -50°C to 150°C, providing a 25°C lower minimum temperature compared to the SSL32 R7G (-55°C). For applications requiring -55°C operation, the B320Q-13-F or 5820SMJE3/TR13 are preferred alternatives.

Q: Why is the 5820SMJ/TR13 listed as non-compliant?

A: The 5820SMJ/TR13 carries RoHS non-compliant status, indicating it does not meet Restriction of Hazardous Substances directives. Applications subject to RoHS requirements must use ROHS3-compliant alternatives such as 5820SMJE3/TR13, B320Q-13-F, or CDBC320-HF.

Q: Can I use the B520CQ-13-F as a substitute?

A: The B520CQ-13-F is not a direct substitute. It is rated for 5 A average rectified current, exceeding the SSL32 R7G specification of 3 A. While higher current capacity provides design margin, it represents a different component class and may introduce unnecessary cost and board space considerations.

Q: What packaging options are available for 20 V / 3 A Schottky diodes?

A: Active substitutes are available in three surface mount packages: DO-214AB (SMC) represented by B320Q-13-F and CDBC320-HF; DO-214AC (SMA) represented by B320A-13-F; and DO-214AA (SMB) represented by B320B-13-F. Package selection depends on PCB layout constraints and thermal dissipation requirements.

Q: How does forward voltage affect circuit performance?

A: Forward voltage determines power dissipation and voltage drop across the diode during conduction. The SSL32 R7G specifies 410 mV @ 3 A, while most active substitutes specify 450–500 mV @ 3 A. Higher forward voltage increases power loss proportionally. Applications with tight power budgets should prioritize CDBC320-HF (450 mV) over alternatives at 500 mV.

Q: Are there inventory considerations for substitute selection?

A: Yes. The B320B-13-F (SMB package) maintains the highest inventory at 344,300 pcs, followed by B320A-13-F (SMA, 35,100 pcs) and B320-13-F (SMC, 32,400 pcs). The 5820SMJE3/TR13 (1,137 pcs) and CDBC320-HF (1,313 pcs) offer moderate availability. Inventory levels should be verified with suppliers for production planning.

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