SB320-T Schottky Diode Equivalent & Substitute Parts

Part Overview

The SB320-T is a 20V, 3A Schottky rectifier diode manufactured by Diodes Incorporated in DO-201AD axial through-hole packaging. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design and procurement requirements. Schottky diodes in this voltage and current class are used in power supply rectification, reverse polarity protection, and high-frequency switching applications where fast recovery characteristics are required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 20 V	µA
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SB320-T is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 20 V
Current - Average Rectified (Io): 3 A
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole
Package / Case: DO-201AD or compatible axial package (DO-201AA, DO-27)

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitutes may vary within the range of 475 mV to 850 mV at specified current levels
Current - Reverse Leakage @ Vr: Substitutes may range from 500 µA to 2 mA at 20 V
Operating Temperature - Junction: Substitutes may operate within -50°C to -65°C minimum and 125°C to 150°C maximum

All identified substitute parts meet the core electrical specifications and are available in active product status from their respective manufacturers.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Temp Range [°C]	RoHS
SB320-T	Diodes Incorporated	Obsolete	20	3	500 @ 3 A	500 @ 20 V	DO-201AD	-65 ~ 150	ROHS3
SB320E-G	Comchip Technology	Active	20	3	500 @ 3 A	500 @ 20 V	DO-201AD	-65 ~ 125	ROHS3
1N5820	Diotec Semiconductor	Active	20	3	850 @ 9.4 A	2000 @ 20 V	DO-201AA / DO-27	-50 ~ 150	ROHS3
1N5820-E3/54	Vishay General Semiconductor - Diodes Division	Active	20	3	475 @ 3 A	2000 @ 20 V	DO-201AD	-65 ~ 125	ROHS3
1N5820-E3/73	Vishay General Semiconductor - Diodes Division	Active	20	3	475 @ 3 A	2000 @ 20 V	DO-201AD	-65 ~ 125	ROHS3
1N5820G	onsemi	Active	20	3	475 @ 3 A	2000 @ 20 V	DO-201AA / DO-27	-65 ~ 125	ROHS3

Engineering Selection Recommendations

Primary Substitute: SB320E-G (Comchip Technology)

The SB320E-G is the closest functional equivalent to the SB320-T. It maintains identical electrical specifications including 20V reverse voltage, 3A average rectified current, and 500 mV forward voltage at 3A. The part is available in active product status with ROHS3 compliance. The operating temperature range is reduced to -65°C to 125°C compared to the original -65°C to 150°C specification. This part is suitable for applications where the upper temperature limit of 125°C is acceptable.

Secondary Substitutes: 1N5820-E3/54 and 1N5820-E3/73 (Vishay General Semiconductor - Diodes Division)

Both Vishay parts are active, ROHS3 compliant, and available in DO-201AD packaging. They provide superior forward voltage characteristics at 475 mV @ 3A and are rated for -65°C to 125°C operation. Reverse leakage current is specified at 2 mA @ 20V, which is higher than the original specification but within acceptable limits for most applications. These parts are available in Cut Tape packaging.

Alternative Substitute: 1N5820G (onsemi)

The 1N5820G is an active, ROHS3 compliant part with identical electrical specifications to the Vishay alternatives. It is available in bulk packaging and operates across -65°C to 125°C. Package options include DO-201AA and DO-27 axial configurations, providing mechanical compatibility with through-hole mounting requirements.

General Substitute: 1N5820 (Diotec Semiconductor)

The 1N5820 from Diotec is an active, ROHS3 compliant alternative available in DO-201AA and DO-27 packages. This part operates across -50°C to 150°C, providing the widest upper temperature range. Forward voltage is specified at 850 mV @ 9.4A, and reverse leakage is 2 mA @ 20V. The minimum operating temperature is -50°C rather than -65°C. This part is suitable for applications where the extended upper temperature capability is beneficial.

All substitute parts are ROHS3 compliant and suitable for applications requiring environmental compliance. Selection should be based on specific application requirements regarding operating temperature range, packaging format, and availability.

Frequently Asked Questions (FAQ)

Q: Can the SB320E-G directly replace the SB320-T in all applications?

A: The SB320E-G is electrically equivalent to the SB320-T with identical voltage, current, and forward voltage specifications. The primary difference is the reduced maximum operating temperature of 125°C versus 150°C. Direct replacement is suitable for applications where junction temperatures do not exceed 125°C.

Q: What is the difference between the Vishay 1N5820-E3/54 and 1N5820-E3/73 parts?

A: Both parts are electrically identical with 20V reverse voltage, 3A current rating, and 475 mV forward voltage at 3A. The primary difference is packaging: 1N5820-E3/54 is supplied in Cut Tape format, while 1N5820-E3/73 is also supplied in Cut Tape but with different reel specifications. Both are suitable for the same applications.

Q: Are there package compatibility issues between DO-201AD and DO-201AA?

A: DO-201AD and DO-201AA are both axial through-hole packages with compatible mechanical dimensions for PCB mounting. Parts specified in either package can be used interchangeably in through-hole applications without modification to board layout or assembly procedures.

Q: Why does the 1N5820 from Diotec have a higher forward voltage specification?

A: The 1N5820 forward voltage is specified at 850 mV @ 9.4A, which is a different measurement condition than the 500 mV @ 3A specification of the SB320-T. At the 3A operating point, the 1N5820 forward voltage would be lower than the specified value. This part remains suitable for applications where the SB320-T was used.

Q: What is the significance of reverse leakage current differences between parts?

A: The SB320-T specifies 500 µA reverse leakage at 20V, while substitute parts specify 2 mA. Higher reverse leakage increases standby power consumption and heat generation in reverse-biased conditions. For most power supply and switching applications, the 2 mA specification is acceptable. Applications with stringent leakage requirements should verify compatibility through circuit analysis.

Q: Can I use the 1N5820G in applications requiring operation below -50°C?

A: The 1N5820G is rated for -65°C minimum junction temperature, making it suitable for low-temperature applications. The 1N5820 from Diotec is rated only to -50°C minimum and should not be used in applications requiring operation below -50°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all identified substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions equivalent to the original SB320-T specification.

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