SB340/4 Equivalent & Substitute Parts

Part Overview

The SB340/4 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 3 A average rectified current in a through-hole DO-201AD axial package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for this diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	490	mV @ 3 A
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
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 SB340/4 is determined by the following critical parameters: maximum reverse voltage (40 V), average rectified current (3 A minimum), forward voltage drop characteristics, reverse leakage current, fast recovery speed classification, through-hole mounting configuration, and axial package compatibility. Parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents maintain all electrical specifications and package designation while differing only in manufacturer packaging format (tape and reel versus bulk) or product status (active versus obsolete). These parts are direct functional replacements.

Direct Manufacturer Alternatives are offered by different manufacturers under the same base part number (SB340) with identical electrical ratings and through-hole axial mounting, though package case designations may vary slightly (DO-201AA versus DO-201AD).

Manufacturer-Recommended Substitutes are cross-referenced alternatives from different manufacturers that meet or exceed the primary electrical specifications (40 V, 3 A minimum) and maintain fast recovery Schottky technology with through-hole axial mounting. These parts may exhibit minor variations in forward voltage, reverse leakage, or operating temperature range within acceptable engineering tolerances for this component category.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [mV]	Ir @ 40V [µA]	Package	Status	RoHS
SB340/4	Vishay	40	3	490	500	DO-201AD	Obsolete	Non-compliant
SB340-E3/54	Vishay	40	3	490	500	DO-201AD	Active	ROHS3 Compliant
SB340-E3/73	Vishay	40	3	490	500	DO-201AD	Active	ROHS3 Compliant
SB340	Diotec	40	3	490	500	DO-201AA	Active	Not applicable
1N5822	Microchip	40	3	500	100	B, Axial	Active	Non-compliant
1N5822-TP	Micro Commercial Co	40	3	525	500	DO-201AD	Active	ROHS3 Compliant
1N5822RLG	onsemi	40	3	525	2000	DO-201AA	Active	ROHS3 Compliant
31DQ04	SMC Diode Solutions	40	3.3	570	1000	DO-201AD	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SB340-E3/54 or SB340-E3/73

These Vishay parts are parametric equivalents of the SB340/4, maintaining identical electrical specifications (40 V, 3 A, 490 mV forward voltage, 500 µA reverse leakage) and DO-201AD package configuration. Both parts are active products with ROHS3 compliance, offering superior availability (1711 and 2400 units respectively) compared to the obsolete main part. Selection between these two variants depends on packaging format requirements (tape and reel availability).

Secondary Recommendation: SB340 (Diotec)

The Diotec SB340 provides direct part number equivalence with identical electrical ratings and through-hole axial mounting. This part is active with substantial inventory (10100 units). Package designation variation (DO-201AA versus DO-201AD) does not affect functional compatibility in through-hole applications. RoHS status is not applicable for this manufacturer offering.

Tertiary Recommendation: 1N5822-TP

The 1N5822-TP from Micro Commercial Co meets all primary electrical requirements (40 V, 3 A) with DO-201AD package compatibility. Forward voltage is slightly elevated at 525 mV (versus 490 mV), and reverse leakage matches the main part at 500 µA. This part is active with ROHS3 compliance and high availability (10223 units). Operating temperature range (-55 to 125°C) is narrower than the main part (-65 to 125°C).

Alternative Consideration: 1N5822RLG

The onsemi 1N5822RLG is an active, ROHS3-compliant alternative with 40 V and 3 A ratings. Forward voltage is 525 mV and reverse leakage is elevated at 2 mA. Package designation is DO-201AA (axial), which is mechanically compatible with DO-201AD applications. This part offers good availability (1781 units).

Not Recommended: 31DQ04

While the SMC Diode Solutions 31DQ04 meets voltage and current requirements with enhanced current rating (3.3 A), it exhibits significantly higher forward voltage (570 mV) and reverse leakage (1 mA), making it suitable only for applications where these parameter variations are acceptable. REACH status is affected for this part.

Not Recommended: 1N5822G

The 1N5822G from Microchip Technology lacks sufficient parametric documentation (missing current, speed, and temperature specifications) for reliable substitution determination.

Frequently Asked Questions (FAQ)

Q: Can SB340-E3/54 and SB340-E3/73 be used interchangeably with SB340/4?

A: Yes. Both parts are parametric equivalents with identical electrical specifications (40 V, 3 A, 490 mV forward voltage, 500 µA reverse leakage) and DO-201AD package configuration. The difference between these two variants is packaging format (tape and reel). Both are active products with ROHS3 compliance, making them direct replacements for the obsolete SB340/4.

Q: What is the difference between DO-201AD and DO-201AA packages?

A: Both designations refer to through-hole axial diode packages with identical mechanical and electrical compatibility. DO-201AD and DO-201AA are functionally interchangeable in circuit applications. The designation variation reflects different standardization references but does not affect board layout or performance.

Q: Is the 1N5822-TP suitable as a replacement for SB340/4?

A: The 1N5822-TP is functionally suitable with the following considerations: it maintains 40 V and 3 A ratings with DO-201AD package compatibility. Forward voltage is 525 mV (versus 490 mV for SB340/4), representing a 35 mV increase. Reverse leakage matches at 500 µA. Operating temperature range is -55 to 125°C (versus -65 to 125°C). This part is active and ROHS3 compliant. Substitution is acceptable where the forward voltage increase does not impact circuit performance.

Q: Why does 1N5822RLG show higher reverse leakage (2 mA) compared to SB340/4 (500 µA)?

A: Reverse leakage variation reflects manufacturing process differences between onsemi and Vishay. The 1N5822RLG remains within acceptable Schottky diode performance parameters for 40 V, 3 A applications. Substitution is acceptable where reverse leakage increase does not compromise circuit function, particularly in low-current bias or high-impedance applications.

Q: Can 31DQ04 replace SB340/4?

A: The 31DQ04 meets voltage (40 V) and minimum current (3.3 A exceeds 3 A requirement) specifications with DO-201AD package compatibility. However, forward voltage is significantly higher at 570 mV (versus 490 mV), and reverse leakage is elevated at 1 mA. Substitution is acceptable only in applications where these parameter increases do not degrade circuit performance. REACH status is affected for this part.

Q: What is the inventory status for equivalent parts?

A: SB340-E3/73 offers the highest availability at 2400 units, followed by Diotec SB340 at 10100 units and 1N5822-TP at 10223 units. SB340-E3/54 has 1711 units available. The obsolete SB340/4 has 920 units in stock. For new designs, active parts with higher inventory are recommended.

Q: Are all substitute parts ROHS3 compliant?

A: SB340-E3/54, SB340-E3/73, 1N5822-TP, 1N5822RLG, and 31DQ04 are ROHS3 compliant. The Microchip 1N5822 and Diotec SB340 are not ROHS3 compliant or have not applicable status. Compliance requirements should be verified against specific application and regulatory standards.

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