B320-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B320-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 20 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with acceptable parameter variations within engineering tolerances.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
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	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the B320-13 is determined by the following critical parameters: Schottky technology classification, 20 V maximum reverse voltage rating, 3 A average rectified current capacity, fast recovery speed characteristic (≤ 500ns for currents > 200mA), surface mount mounting type, and DO-214AB package compatibility. Reverse leakage current, forward voltage drop, and capacitance values are secondary parameters that may vary within acceptable engineering tolerances. Operating temperature range and RoHS compliance status are additional considerations for specific application requirements.

Substitute parts are grouped into three categories:

Parametric Equivalents (Identical Electrical Specifications): Parts maintaining all primary electrical parameters including reverse voltage, forward voltage, reverse leakage current, and speed characteristics.

Packaging Variants (Same Electrical, Different Packaging): Parts with identical electrical specifications but alternative packaging formats (Tape & Reel versus Cut Tape).

Functional Alternatives (Acceptable Parameter Variations): Parts meeting core voltage and current requirements with allowable variations in secondary parameters such as reverse leakage current or capacitance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	RoHS Status
B320-13	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	DO-214AB, SMC	Discontinued	Non-compliant
B320-13-F	Diodes Incorporated	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	DO-214AB, SMC	Active	ROHS3 Compliant
SS32-E3/9AT	Vishay General Semiconductor	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	DO-214AB, SMC	Active	ROHS3 Compliant
SS32-E3/57T	Vishay General Semiconductor	20 V	3 A	500 mV @ 3 A	500 µA @ 20 V	DO-214AB, SMC	Active	ROHS3 Compliant
SS32	MDD	20 V	3 A	—	500 µA @ 20 V	DO-214AC, SMA	Active	ROHS3 Compliant
MBRS320T3G	onsemi	20 V	3 A	500 mV @ 3 A	2 mA @ 20 V	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: B320-13-F

The B320-13-F is the direct equivalent replacement for the discontinued B320-13. Both parts are manufactured by Diodes Incorporated and maintain identical electrical specifications across all primary parameters: 20 V reverse voltage, 3 A average rectified current, 500 mV forward voltage drop at 3 A, and 500 µA reverse leakage current. The B320-13-F is currently in active production status with 32,400 units in stock and carries ROHS3 compliance certification, addressing regulatory requirements not met by the original B320-13. Packaging is available in Tape & Reel format, suitable for automated assembly processes.

Secondary Recommendations: SS32-E3/9AT and SS32-E3/57T

Both Vishay General Semiconductor parts (SS32-E3/9AT and SS32-E3/57T) are parametric equivalents with identical electrical specifications to the B320-13. These parts maintain the same 20 V reverse voltage, 3 A current rating, 500 mV forward voltage, and 500 µA reverse leakage current. Both are ROHS3 compliant and in active production. The primary distinction is packaging format: SS32-E3/9AT is supplied in Tape & Reel format (3,800 units available), while SS32-E3/57T is supplied in Cut Tape format (1,262 units available). Selection between these variants depends on assembly equipment compatibility and procurement volume requirements.

Alternative Recommendation: MBRS320T3G

The MBRS320T3G manufactured by onsemi is a functional alternative meeting core voltage and current specifications. This part maintains 20 V reverse voltage and 3 A current rating with identical forward voltage characteristics. The reverse leakage current specification differs at 2 mA @ 20 V compared to 500 µA for the B320-13, representing a higher leakage characteristic acceptable for most applications. The MBRS320T3G is ROHS3 compliant, in active production with 103,732 units in stock, and packaged in DO-214AB SMC format. Extended operating temperature range (-65°C to 150°C) provides additional thermal margin compared to the B320-13 specification (-55°C to 125°C).

Package Variant: SS32

The MDD SS32 is a functional alternative with identical electrical specifications but different package format. This part uses DO-214AC (SMA) package instead of DO-214AB (SMC), requiring PCB layout and assembly process modifications. Selection of this variant is appropriate only when SMA package compatibility is required or when SMC package alternatives are unavailable. The SS32 is ROHS3 compliant and in active production with 19,566 units available.

Frequently Asked Questions (FAQ)

Q: Can B320-13-F be used as a direct replacement for B320-13?

A: Yes. The B320-13-F is manufactured by the same supplier (Diodes Incorporated) and maintains identical electrical specifications across all primary parameters: 20 V reverse voltage, 3 A average rectified current, 500 mV forward voltage drop, and 500 µA reverse leakage current. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 compliant versus non-compliant). No circuit modifications are required.

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

A: Both parts are electrically identical Vishay equivalents with the same 20 V, 3 A specifications and 500 µA reverse leakage current. The difference is packaging format: SS32-E3/9AT is supplied in Tape & Reel (TR) format suitable for automated pick-and-place assembly, while SS32-E3/57T is supplied in Cut Tape (CT) format. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Why does MBRS320T3G have higher reverse leakage current (2 mA) compared to B320-13 (500 µA)?

A: The MBRS320T3G is a functional alternative from onsemi that meets the core voltage and current requirements but with different reverse leakage characteristics. The 2 mA leakage at 20 V is acceptable for most rectifier applications and does not compromise circuit performance in typical power supply and switching applications. This part is selected when availability of parametric equivalents is limited or when the extended operating temperature range (-65°C to 150°C) is required.

Q: Can SS32 (SMA package) be used instead of B320-13 (SMC package)?

A: The SS32 is electrically equivalent but uses a different package format (DO-214AC SMA versus DO-214AB SMC). Physical dimensions and PCB footprints differ between these packages. Substitution requires PCB layout modification and assembly process changes. This option is appropriate only when SMA package compatibility is required or when SMC alternatives are unavailable.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts (B320-13-F, SS32-E3/9AT, SS32-E3/57T, MBRS320T3G, and SS32) carry ROHS3 compliance certification. The original B320-13 is RoHS non-compliant. Selection of compliant alternatives ensures regulatory compliance for new designs and production runs.

Q: What is the operating temperature range difference between B320-13 and MBRS320T3G?

A: The B320-13 operates from -55°C to 125°C junction temperature, while MBRS320T3G operates from -65°C to 150°C. The MBRS320T3G provides extended low-temperature operation (10°C lower minimum) and extended high-temperature operation (25°C higher maximum). This extended range is beneficial for applications with demanding thermal environments but is not required for standard industrial temperature range applications.

Q: Which substitute part has the highest inventory availability?

A: The MBRS320T3G from onsemi has the highest inventory availability with 103,732 units in stock, followed by B320-13-F with 32,400 units. Both parts are suitable for high-volume production requirements.

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