SS32 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS32 is a Schottky rectifier diode rated for 20 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. Manufactured by onsemi, this component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for design continuity, inventory management, and ongoing production support for existing applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	20 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 20 V
Package / Case	DO-214AB, SMC
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SS32 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) must equal or exceed 20 V
Current - Average Rectified (Io) must equal or exceed 3 A
Forward voltage (Vf) characteristics must be compatible with circuit design
Reverse leakage current must not exceed application limits
Fast recovery speed (≤ 500ns, > 200mA) must be maintained

Mechanical Compatibility Requirements:

Package / Case must be DO-214AB (SMC) or compatible surface mount package
Mounting type must be surface mount
Physical dimensions must allow direct PCB placement

Compliance Requirements:

RoHS3 compliance preferred for new designs
Operating temperature range must support application requirements

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Electrical & Mechanical Specifications): Parts meeting all electrical parameters (20 V, 3 A, 500 mV Vf @ 3 A) in DO-214AB package with active product status.

Functional Alternatives (Higher Current or Voltage Rating): Parts exceeding the SS32 specifications in current or voltage rating, suitable for applications where upgraded performance is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Package	Product Status	RoHS Status	Temp Range
SS32	onsemi	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	Not For New Designs	ROHS3 Compliant	-55°C ~ 150°C
MBRS320T3G	onsemi	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant	-65°C ~ 150°C
5820SMJ/TR13	Microchip Technology	20 V	3 A	460 mV @ 3 A	DO-214AB	Active	RoHS non-compliant	-55°C ~ 150°C
B320-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant	-55°C ~ 125°C
B520C-13-F	Diodes Incorporated	20 V	5 A	550 mV @ 5 A	DO-214AB, SMC	Active	ROHS3 Compliant	-55°C ~ 150°C
B520CQ-13-F	Diodes Incorporated	20 V	5 A	550 mV @ 5 A	DO-214AB, SMC	Active	ROHS3 Compliant	-55°C ~ 150°C
BAT60BE6327HTSA1	Infineon Technologies	10 V	3 A	600 mV @ 1 A	SC-76, SOD-323	Active	ROHS3 Compliant	-55°C ~ 150°C
SK32B-TP	Micro Commercial Co	20 V	3 A	500 mV @ 3 A	DO-214AA, SMB	Obsolete	ROHS3 Compliant	-55°C ~ 125°C
SS32-E3/57T	Vishay General Semiconductor - Diodes Division	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant	-55°C ~ 125°C
SS32-E3/9AT	Vishay General Semiconductor - Diodes Division	20 V	3 A	500 mV @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant	-55°C ~ 125°C
STPS340S	STMicroelectronics	40 V	3 A	630 mV @ 3 A	DO-214AB, SMC	Active	ROHS3 Compliant	-55°C ~ 150°C

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

MBRS320T3G (onsemi) is the recommended primary substitute. It provides identical electrical specifications (20 V, 3 A, 500 mV Vf @ 3 A) in the same DO-214AB SMC package with active product status and ROHS3 compliance. Extended temperature range (-65°C to 150°C) provides additional margin for demanding applications.

SS32-E3/57T and SS32-E3/9AT (Vishay General Semiconductor - Diodes Division) are direct electrical equivalents with identical 20 V, 3 A, 500 mV specifications in DO-214AB SMC package. Both carry active product status and ROHS3 compliance. These parts share the SS32 base product number, indicating design lineage and compatibility.

B320-13-F (Diodes Incorporated) meets all electrical requirements with 20 V, 3 A, 500 mV Vf @ 3 A in DO-214AB SMC package. Active product status and ROHS3 compliance are confirmed. Operating temperature range is -55°C to 125°C, which is narrower than the original SS32 specification.

Secondary Substitutes (Higher Current Rating):

B520C-13-F and B520CQ-13-F (Diodes Incorporated) provide 5 A current rating with 20 V voltage specification in DO-214AB SMC package. These parts are suitable for applications where current margin is required. B520CQ-13-F includes AEC-Q101 automotive qualification. Forward voltage is 550 mV @ 5 A, which is higher than the SS32 specification at 3 A operation.

Voltage-Upgraded Substitute:

STPS340S (STMicroelectronics) provides 40 V reverse voltage rating with 3 A current in DO-214AB SMC package. This part is suitable for applications requiring higher voltage margin. Forward voltage is 630 mV @ 3 A, which exceeds the SS32 specification.

Not Recommended:

BAT60BE6327HTSA1 (Infineon Technologies) has insufficient voltage rating (10 V maximum) and different package (SOD-323), making it unsuitable for SS32 replacement.

SK32B-TP (Micro Commercial Co) is classified as obsolete and uses DO-214AA (SMB) package, which differs from the SS32 DO-214AB (SMC) package.

5820SMJ/TR13 (Microchip Technology) is RoHS non-compliant, which may conflict with design requirements for new applications.

Frequently Asked Questions (FAQ)

Q: Can MBRS320T3G directly replace SS32 in existing designs?

A: Yes. MBRS320T3G provides identical electrical specifications (20 V, 3 A, 500 mV Vf @ 3 A) in the same DO-214AB SMC package. Both are Schottky diodes with fast recovery characteristics. The part is in active production status with ROHS3 compliance.

Q: What is the difference between SS32-E3/57T and SS32-E3/9AT?

A: Both parts are Vishay variants of the SS32 with identical electrical specifications. The difference is packaging format: SS32-E3/57T is supplied in Cut Tape (CT) & Digi-Reel format, while SS32-E3/9AT is supplied in Tape & Reel (TR) format. Electrical performance and DO-214AB SMC package are identical.

Q: Can B520C-13-F be used as a substitute for SS32?

A: B520C-13-F is a functional alternative with higher current rating (5 A vs. 3 A) and identical 20 V voltage specification. It is suitable for applications where current margin is beneficial. Forward voltage is 550 mV @ 5 A, which is higher than SS32 at 3 A operation. Verify circuit design compatibility before substitution.

Q: Why is BAT60BE6327HTSA1 not suitable for SS32 replacement?

A: BAT60BE6327HTSA1 has maximum reverse voltage of 10 V, which is insufficient for the SS32 specification of 20 V. Additionally, it uses SOD-323 package instead of DO-214AB SMC, preventing direct PCB placement compatibility.

Q: Is the temperature range difference between B320-13-F (-55°C to 125°C) and SS32 (-55°C to 150°C) significant?

A: The upper temperature limit of B320-13-F is 25°C lower than SS32. For applications operating near 125°C junction temperature, this difference is not significant. For applications requiring operation above 125°C, MBRS320T3G or B520C-13-F are preferred due to their 150°C maximum rating.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates the diode has fast recovery time characteristics, with recovery time not exceeding 500 nanoseconds for reverse recovery when forward current exceeds 200 milliamps. All listed substitutes maintain this fast recovery specification, ensuring switching performance compatibility.

Q: Can STPS340S be used in place of SS32?

A: STPS340S provides higher voltage rating (40 V vs. 20 V) with identical 3 A current in DO-214AB SMC package. It is suitable for applications where higher voltage margin is required. Forward voltage is 630 mV @ 3 A, which is higher than SS32. Verify circuit design compatibility, particularly regarding forward voltage drop impact on system performance.

Q: Why is 5820SMJ/TR13 not recommended despite matching electrical specifications?

A: 5820SMJ/TR13 is RoHS non-compliant, which conflicts with ROHS3 compliance requirements for new designs and many procurement standards. Additionally, inventory is limited (699 pcs) compared to other active alternatives.

Q: What is the significance of "Product Status: Active" vs. "Not For New Designs"?

A: "Active" status indicates the part is in current production with ongoing manufacturer support and stable supply. "Not For New Designs" indicates the part has reached end-of-life and is no longer recommended for new circuit designs, though existing inventory may remain available. Substitutes with "Active" status are preferred for design continuity and long-term availability.

Q: Are all substitute parts RoHS3 compliant?

A: No. 5820SMJ/TR13 is RoHS non-compliant. All other listed substitutes are ROHS3 compliant. For applications requiring RoHS compliance, select from MBRS320T3G, B320-13-F, B520C-13-F, B520CQ-13-F, SS32-E3/57T, SS32-E3/9AT, or STPS340S.

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