SB340-T Equivalent & Substitute Parts

Part Overview

The SB340-T is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 40 V DC reverse voltage and 3 A average rectified current in a DO-201AD through-hole axial package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for existing designs and production requirements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 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 @ 40 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the SB340-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 3 A
Mounting Type: Through Hole
Package / Case: DO-201AD, Axial
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: 500–525 mV @ 3 A
Current - Reverse Leakage @ Vr: 100–500 µA @ 40 V (within specified range)
Operating Temperature - Junction: Minimum -65°C to -50°C; Maximum 125°C to 150°C

Substitute parts must satisfy all mandatory parameters. Variations in forward voltage, reverse leakage, and operating temperature range are acceptable provided they do not degrade circuit performance or thermal management.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Package	Temp Range (Tj)	RoHS Status
SB340-T	Diodes Incorporated	Obsolete	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-201AD	-65°C ~ 150°C	ROHS3 Compliant
SB340E-G	Comchip Technology	Active	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-201AD	-65°C ~ 125°C	ROHS3 Compliant
SR304-AP	Micro Commercial Co	Active	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-201AD	-50°C ~ 125°C	Not Specified
SR304-BP	Micro Commercial Co	Active	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-201AD	-50°C ~ 125°C	Not Specified
SR304-TP	Micro Commercial Co	Active	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-201AD	-50°C ~ 125°C	Not Specified
1N5822	Microchip Technology	Active	40 V	3 A	500 mV @ 3 A	100 µA @ 40 V	B, Axial	-65°C ~ 125°C	RoHS Non-compliant
1N5822-AP	Micro Commercial Co	Active	40 V	3 A	525 mV @ 3 A	500 µA @ 40 V	DO-201AD	-55°C ~ 125°C	Not Specified
1N5822-E3/73	Vishay General Semiconductor - Diodes Division	Active	40 V	3 A	525 mV @ 3 A	2 mA @ 40 V	DO-201AD	-65°C ~ 125°C	ROHS3 Compliant
1N5822-TP	Micro Commercial Co	Active	40 V	3 A	525 mV @ 3 A	500 µA @ 40 V	DO-201AD	-55°C ~ 125°C	ROHS3 Compliant
1N5822RLG	onsemi	Active	40 V	3 A	525 mV @ 3 A	2 mA @ 40 V	DO-201AA, DO-27, Axial	-65°C ~ 125°C	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SB340E-G (Comchip Technology) and 1N5822-TP (Micro Commercial Co) are direct electrical and mechanical equivalents to the SB340-T. Both maintain identical voltage, current, and forward voltage specifications with DO-201AD packaging. SB340E-G operates to -65°C minimum temperature, matching the original part's lower thermal limit. Both are ROHS3 compliant or active status, ensuring regulatory compliance and supply chain availability.

Secondary Substitutes (Acceptable with Design Verification):

SR304-AP, SR304-BP, and SR304-TP (Micro Commercial Co) satisfy all mandatory electrical parameters and package requirements. These parts operate to -50°C minimum, which is acceptable for applications not requiring extended low-temperature performance below -50°C. All three variants are active products with confirmed inventory.

1N5822-AP (Micro Commercial Co) and 1N5822-E3/73 (Vishay) are functionally equivalent with forward voltage specifications of 525 mV @ 3 A, representing a 25 mV increase from the original 500 mV specification. This variation is within acceptable limits for most rectifier applications. 1N5822-E3/73 provides ROHS3 compliance and extended temperature range to -65°C.

Alternative Substitute (Package Consideration):

1N5822 (Microchip Technology) and 1N5822RLG (onsemi) meet all electrical specifications but use package designations B or DO-201AA/DO-27 instead of DO-201AD. Physical compatibility must be verified for PCB footprint and mechanical mounting before selection. 1N5822RLG is ROHS3 compliant with active product status.

Compliance Considerations:

Parts designated ROHS3 compliant (SB340E-G, 1N5822-TP, 1N5822-E3/73, 1N5822RLG) are preferred for applications subject to RoHS Directive requirements. The 1N5822 variant from Microchip is RoHS non-compliant and should be selected only when RoHS compliance is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can SB340E-G directly replace SB340-T without circuit modification?

A: Yes. SB340E-G maintains identical electrical specifications (40 V, 3 A, 500 mV forward voltage) and DO-201AD packaging. The operating temperature range extends to -65°C minimum, matching the original part. No circuit modification is required.

Q: What is the difference between SR304 variants (AP, BP, TP) and the original SB340-T?

A: SR304 variants are electrically equivalent across voltage, current, and forward voltage specifications. The primary difference is the minimum operating temperature of -50°C versus -65°C for the SB340-T. Selection depends on application temperature requirements. All three variants (AP, BP, TP) are identical electrically; packaging format (Bulk) differs from the original.

Q: Why do some substitutes show higher forward voltage (525 mV vs. 500 mV)?

A: Forward voltage variation of 25 mV is within acceptable tolerance for Schottky diode rectifiers and does not degrade circuit performance in standard rectification applications. Parts with 525 mV forward voltage (1N5822-AP, 1N5822-TP, 1N5822-E3/73, 1N5822RLG) are suitable substitutes provided the circuit design accommodates this specification.

Q: Is the 1N5822 series compatible with SB340-T applications?

A: The 1N5822 series (including 1N5822, 1N5822-AP, 1N5822-TP, 1N5822-E3/73, 1N5822RLG) meets all electrical requirements for 40 V, 3 A Schottky rectification. Package compatibility must be verified: 1N5822 uses package designation B (Axial), while 1N5822-AP, 1N5822-TP, and 1N5822-E3/73 use DO-201AD. 1N5822RLG supports multiple package options including DO-201AA and DO-27. Confirm PCB footprint compatibility before selection.

Q: What is the significance of reverse leakage current variation (100 µA to 2 mA)?

A: Reverse leakage current affects standby power dissipation and circuit performance in high-impedance applications. The original SB340-T specifies 500 µA @ 40 V. Substitutes with lower leakage (1N5822 at 100 µA, 1N5822-E3/73 and 1N5822RLG at 2 mA) provide improved performance. Higher leakage values do not compromise standard rectifier operation but increase standby current draw.

Q: Are all substitute parts currently in active production?

A: Yes. All listed substitutes are designated Active product status, ensuring ongoing availability and supply chain support. The original SB340-T is classified Obsolete, making active substitutes necessary for new designs and production continuity.

Q: Which substitute offers the best RoHS compliance?

A: SB340E-G, 1N5822-TP, 1N5822-E3/73, and 1N5822RLG are all ROHS3 compliant. For applications requiring RoHS certification, these four options are preferred. The 1N5822 variant from Microchip is RoHS non-compliant and should be avoided in regulated applications.

Q: Can I use 1N5822RLG if my PCB is designed for DO-201AD footprint?

A: 1N5822RLG supports DO-201AA and DO-27 package options in addition to Axial designation. Physical verification of lead spacing and footprint compatibility is required. While electrically equivalent, mechanical fit must be confirmed before assembly.

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