SB340 Equivalent & Substitute Parts

Part Overview

The SB340 is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 3 A average rectified current in a DO-201AD through-hole axial package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for Schottky diode applications.

Key Parameters

Parameter	Value	Unit
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
Capacitance @ Vr, F	180	pF @ 4V, 1MHz
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SB340 is determined by matching the following critical parameters: voltage rating (40 V DC reverse), current rating (3 A average rectified), forward voltage drop (500 mV maximum at 3 A), fast recovery speed characteristic (≤ 500ns for currents > 200mA), reverse leakage current (500 µA at 40 V), and junction capacitance (180 pF at 4V, 1MHz). Package compatibility includes DO-201AD and axial through-hole configurations. Operating temperature range of -65°C to 125°C establishes the thermal envelope for substitution.

Substitute parts are grouped into two categories:

Direct Equivalents: Parts matching all electrical parameters and DO-201AD package specification with identical reverse leakage and capacitance characteristics.

Functional Equivalents: Parts meeting voltage, current, and speed requirements with minor variations in forward voltage, reverse leakage, or capacitance within acceptable engineering tolerances for Schottky rectifier applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [mV]	Reverse Leakage @ 40V [µA]	Capacitance @ 4V, 1MHz [pF]	Package	Temp Range [°C]	Status
SB340	onsemi	40	3	500	500	180	DO-201AD	-65 to 125	Obsolete
SR304-AP	Micro Commercial Co	40	3	500	500	180	DO-201AD	-50 to 125	Active
SR304-BP	Micro Commercial Co	40	3	500	500	180	DO-201AD	-50 to 125	Active
SR304-TP	Micro Commercial Co	40	3	500	500	180	DO-201AD	-50 to 125	Active
1N5822-AP	Micro Commercial Co	40	3	525	500	200	DO-201AD	-55 to 125	Active
1N5822-TP	Micro Commercial Co	40	3	525	500	200	DO-201AD	-55 to 125	Active
1N5822H	Taiwan Semiconductor Corporation	40	3	525	500	200	DO-201AD	-55 to 125	Active
1N5822RLG	onsemi	40	3	525	2000	—	DO-201AA, DO-27	-65 to 125	Active
1N5822	Microchip Technology	40	3	500	100	—	B, Axial	-65 to 125	Active
1N5822G	Microchip Technology	—	—	—	—	—	Axial	—	Active

Engineering Selection Recommendations

Direct Replacement (Preferred): The SR304 series (SR304-AP, SR304-BP, SR304-TP) manufactured by Micro Commercial Co provides direct electrical and mechanical equivalence to the SB340. All three variants maintain identical voltage, current, forward voltage, reverse leakage, and capacitance specifications with DO-201AD package compatibility. The operating temperature range is reduced to -50°C to 125°C compared to the SB340's -65°C to 125°C; this difference is acceptable for applications not requiring extended low-temperature operation. All SR304 variants are active products with REACH compliance.

Primary Functional Alternatives: The 1N5822-AP and 1N5822-TP (Micro Commercial Co) and 1N5822H (Taiwan Semiconductor Corporation) maintain the 40 V, 3 A rating with DO-201AD package compatibility. Forward voltage increases to 525 mV at 3 A and junction capacitance increases to 200 pF at 4V, 1MHz. These parameters remain within acceptable tolerances for Schottky rectifier applications. Operating temperature range is -55°C to 125°C. The 1N5822-TP is available in Cut Tape packaging with ROHS3 compliance.

Secondary Alternative: The 1N5822 (Microchip Technology) meets voltage and current specifications with 500 mV forward voltage and superior reverse leakage of 100 µA at 40 V. Package designation is listed as B, Axial. Operating temperature range extends to -65°C to 125°C. RoHS compliance status is non-compliant. This part is available in high inventory (26,834 pcs).

Limited Compatibility: The 1N5822RLG (onsemi) maintains voltage and current ratings but exhibits elevated reverse leakage (2 mA at 40 V) and uses DO-201AA or DO-27 package variants rather than DO-201AD. This part is suitable only for applications where reverse leakage tolerance is not critical.

Insufficient Data: The 1N5822G (Microchip Technology) lacks complete electrical parameter specification and is not recommended for direct substitution without additional datasheet verification.

Frequently Asked Questions (FAQ)

Q: Can the SR304 series directly replace the SB340 in all applications?

A: The SR304-AP, SR304-BP, and SR304-TP provide direct electrical equivalence with identical voltage, current, forward voltage, reverse leakage, and capacitance specifications. The operating temperature minimum is reduced from -65°C to -50°C. Direct replacement is appropriate for applications operating within the -50°C to 125°C range. Applications requiring operation below -50°C require evaluation of the 1N5822 (Microchip Technology) or 1N5822RLG (onsemi).

Q: What is the difference between the SR304-AP, SR304-BP, and SR304-TP variants?

A: All three SR304 variants are manufactured by Micro Commercial Co and maintain identical electrical specifications (40 V, 3 A, 500 mV forward voltage, 500 µA reverse leakage, 180 pF capacitance). The designations AP, BP, and TP indicate different packaging or tape configurations. Selection depends on procurement and assembly requirements.

Q: Are the 1N5822-AP and 1N5822-TP suitable substitutes for the SB340?

A: The 1N5822-AP and 1N5822-TP are functional equivalents meeting the 40 V, 3 A rating with DO-201AD package compatibility. Forward voltage increases to 525 mV (25 mV higher than SB340) and junction capacitance increases to 200 pF (20 pF higher). These variations are within acceptable tolerances for Schottky rectifier applications. Operating temperature range is -55°C to 125°C.

Q: Why does the 1N5822RLG show higher reverse leakage current?

A: The 1N5822RLG exhibits 2 mA reverse leakage at 40 V, compared to 500 µA for the SB340. This four-fold increase indicates different semiconductor processing or die characteristics. The 1N5822RLG is suitable only for applications where reverse leakage current is not a critical design parameter.

Q: What packaging considerations apply to these substitutes?

A: The SB340 uses DO-201AD axial through-hole package. Direct substitutes (SR304 series) maintain DO-201AD compatibility. The 1N5822-AP, 1N5822-TP, and 1N5822H also use DO-201AD packages. The 1N5822RLG uses DO-201AA or DO-27 packages, which may require PCB layout verification. The 1N5822 (Microchip) uses package designation B, Axial, requiring confirmation of physical compatibility with existing board designs.

Q: Which substitute offers the best compliance status?

A: The 1N5822-TP (Micro Commercial Co) and 1N5822H (Taiwan Semiconductor Corporation) both carry ROHS3 compliance. The SR304 series does not specify RoHS status in the provided data. The 1N5822 (Microchip Technology) is listed as RoHS non-compliant. For applications requiring RoHS3 compliance, the 1N5822-TP or 1N5822H are preferred.

Q: Can I use the 1N5822 (Microchip Technology) as a substitute?

A: The 1N5822 (Microchip Technology) meets the 40 V, 3 A rating with 500 mV forward voltage and superior reverse leakage of 100 µA. Operating temperature range extends to -65°C to 125°C. However, the package is designated as B, Axial, which requires physical verification against the DO-201AD specification. RoHS compliance is non-compliant. This part is suitable for applications where package compatibility is confirmed and RoHS compliance is not required.

Q: What is the inventory status of these substitutes?

A: The SR304 series (AP, BP, TP variants) have limited inventory (976–1,176 pcs each). The 1N5822-TP has substantial inventory (10,223 pcs). The 1N5822 (Microchip Technology) has the highest inventory (26,834 pcs). The 1N5822H has limited inventory (790 pcs). Procurement planning should account for these availability levels.

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