SSL32HR7G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SSL32HR7G is a 20V, 3A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AB (SMC) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and repair applications. The part carries automotive-grade qualification (AEC-Q101) and RoHS3 compliance, establishing baseline requirements for substitute selection.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	20	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Maximum @ If	410	mV @ 3A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	—
Current - Reverse Leakage @ Vr	200	µA @ 20V
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 SSL32HR7G is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 20V (exact match required)
Current - Average Rectified (Io): 3A (exact match required)
Technology: Schottky (exact match required)
Package / Case: DO-214AB, SMC (exact match required for direct PCB compatibility)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (exact match required)

Secondary Compatibility Factors:

Operating Temperature Range: Minimum -55°C junction temperature required
RoHS Compliance: ROHS3 compliance preferred for regulatory alignment
Automotive Grade / AEC-Q101: Preferred for applications requiring automotive qualification

Parts meeting all primary criteria are classified as direct electrical and mechanical substitutes. Parts with identical electrical ratings but different package types (SMA, SMB) are listed as functional alternatives requiring PCB layout modification. Parts with different voltage or current ratings are excluded from direct substitution.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV @ 3A	Package	Temp Range °C	RoHS Status	AEC-Q101	Product Status
SSL32HR7G	Taiwan Semiconductor	20	3	410 @ 3A	DO-214AB, SMC	-55 to 125	ROHS3	Yes	Discontinued
5820SMJ/TR13	Microchip Technology	20	3	460 @ 3A	DO-214AB	-55 to 150	Non-compliant	No	Active
5820SMJE3/TR13	Microchip Technology	20	3	460 @ 3A	DO-214AB	-55 to 150	ROHS3	No	Active
B320-13-F	Diodes Incorporated	20	3	500 @ 3A	DO-214AB, SMC	-55 to 125	ROHS3	No	Active
B320A-13-F	Diodes Incorporated	20	3	500 @ 3A	DO-214AC, SMA	-55 to 150	ROHS3	Yes	Active
B320B-13-F	Diodes Incorporated	20	3	500 @ 3A	DO-214AA, SMB	-55 to 150	ROHS3	Yes	Active
B320Q-13-F	Diodes Incorporated	20	3	500 @ 3A	DO-214AB, SMC	-55 to 150	ROHS3	Yes	Active
B370Q-13-F	Diodes Incorporated	70	3	790 @ 3A	DO-214AB, SMC	-55 to 125	ROHS3	Yes	Active
B520C-13-F	Diodes Incorporated	20	5	550 @ 5A	DO-214AB, SMC	-55 to 150	ROHS3	No	Active
B520CQ-13-F	Diodes Incorporated	20	5	550 @ 5A	DO-214AB, SMC	-55 to 150	ROHS3	Yes	Active
CDBC320-HF	Comchip Technology	20	3	450 @ 3A	DO-214AB, SMC	-50 to 150	ROHS3	No	Active

Engineering Selection Recommendations

Direct Electrical and Mechanical Substitutes (20V, 3A, DO-214AB SMC Package):

The following parts satisfy all primary substitution criteria and are suitable for direct replacement without PCB modification:

B320Q-13-F (Diodes Incorporated) is the preferred substitute. This part maintains identical voltage (20V) and current (3A) ratings, DO-214AB SMC package compatibility, and automotive-grade AEC-Q101 qualification. Extended operating temperature range (-55°C to 150°C) exceeds the original specification. RoHS3 compliance is confirmed. Forward voltage specification (500 mV @ 3A) is within acceptable tolerance for Schottky rectifier applications.

5820SMJE3/TR13 (Microchip Technology) provides electrical equivalence with 20V, 3A ratings and DO-214AB package. RoHS3 compliance is confirmed. Extended temperature range (-55°C to 150°C) is available. Forward voltage (460 mV @ 3A) is closer to the original SSL32HR7G specification. Product status is active with confirmed inventory availability.

CDBC320-HF (Comchip Technology) meets electrical requirements with 20V, 3A ratings and DO-214AB SMC package. RoHS3 compliance is confirmed. Forward voltage (450 mV @ 3A) is intermediate between the original and other alternatives. Operating temperature minimum is -50°C, which is 5°C higher than the original specification.

Alternative Package Options (20V, 3A, Different Packages):

B320A-13-F (Diodes Incorporated, SMA package) and B320B-13-F (Diodes Incorporated, SMB package) provide electrical equivalence but require PCB layout modification due to different package footprints. Both carry AEC-Q101 qualification and extended temperature ranges.

Non-Equivalent Parts (Excluded from Direct Substitution):

B370Q-13-F operates at 70V reverse voltage and is not suitable for 20V applications.

B520C-13-F and B520CQ-13-F are rated for 5A average rectified current and are not direct substitutes for 3A applications.

5820SMJ/TR13 (Microchip Technology) lacks RoHS3 compliance and is not recommended for new designs requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can B320Q-13-F replace SSL32HR7G directly on the PCB?

A: Yes. B320Q-13-F maintains identical voltage (20V), current (3A), and package specifications (DO-214AB SMC). No PCB modification is required. The part is pin-compatible and footprint-compatible.

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

A: Both parts are manufactured by Diodes Incorporated with identical electrical ratings (20V, 3A, DO-214AB SMC package). B320Q-13-F carries automotive-grade AEC-Q101 qualification, while B320-13-F does not. For automotive applications, B320Q-13-F is the appropriate selection.

Q: Why is B370Q-13-F listed as a substitute if it has different voltage?

A: B370Q-13-F is not a direct substitute for SSL32HR7G. The 70V rating makes it unsuitable for 20V applications. It is listed in the original part's substitute field but does not meet the primary substitution criteria for this reference.

Q: Can I use B320A-13-F (SMA package) instead of the SMC package?

A: B320A-13-F provides electrical equivalence but uses a different package footprint (SMA vs. SMC). Direct PCB substitution is not possible without layout modification. The part is suitable only if the PCB design can accommodate the SMA package or if rework is performed.

Q: What is the significance of RoHS3 compliance in substitute selection?

A: RoHS3 compliance indicates conformance to European Union Restriction of Hazardous Substances regulations. For applications subject to regulatory requirements or customer specifications mandating RoHS compliance, only RoHS3-compliant substitutes are acceptable. B320Q-13-F, 5820SMJE3/TR13, and CDBC320-HF meet this requirement.

Q: Does forward voltage difference affect circuit performance?

A: Forward voltage specifications are provided at rated current (3A). The SSL32HR7G specifies 410 mV maximum, while alternatives range from 450 mV to 500 mV. These differences are within typical Schottky diode tolerance and do not affect circuit functionality in standard rectification applications. Thermal management and power dissipation calculations should account for the specified forward voltage of the selected substitute.

Q: Is AEC-Q101 qualification required for my application?

A: AEC-Q101 qualification is required for automotive applications and applications subject to automotive supply chain requirements. For non-automotive applications, this qualification is not mandatory. B320Q-13-F, B320A-13-F, and B320B-13-F carry AEC-Q101 qualification. Other alternatives do not.

Q: What is the minimum operating temperature requirement?

A: The SSL32HR7G specifies -55°C minimum junction temperature. All listed substitutes meet or exceed this requirement. Some alternatives extend to -50°C minimum (CDBC320-HF), which is acceptable for most applications. Verify application requirements before selection.

Q: Can I use a 5A-rated diode (B520CQ-13-F) in place of a 3A-rated diode?

A: B520CQ-13-F is rated for 5A average rectified current and is not a direct substitute for 3A applications. While a higher-rated component may function in a 3A circuit, it is not an equivalent substitute and introduces unnecessary cost and board space considerations. Direct 3A-rated alternatives are available.

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