SB340A-E3/73 Equivalent & Substitute Parts

Part Overview

The SB340A-E3/73 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 3 A average rectified current in a through-hole DO-201AD axial package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified parameters while offering active product status and current availability.

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
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 SB340A-E3/73 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 3 A minimum
Voltage - Forward (Vf) (Max) @ If: ≤ 500 mV @ 3 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: ≤ 500 µA @ 40 V

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package / Case: DO-201AD or equivalent axial package (DO-201AA, DO-27, B)

Environmental Requirements:

Operating Temperature - Junction: -65°C minimum to 125°C minimum

Substitute parts must satisfy all electrical parameters within the specified limits and maintain through-hole axial package compatibility. Parts with superior specifications (lower forward voltage, lower leakage current, higher temperature rating) are acceptable substitutes.

Parameter Comparison

Parameter	SB340A-E3/73	SB340-E3/73	1N5822 (Microchip)	1N5822-TP	1N5822RLG
Manufacturer	Vishay	Vishay	Microchip	Micro Commercial Co	onsemi
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	490 mV @ 3 A	500 mV @ 3 A	525 mV @ 3 A	525 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	500 µA @ 40 V	500 µA @ 40 V	100 µA @ 40 V	500 µA @ 40 V	2 mA @ 40 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AD, Axial	DO-201AD, Axial	B, Axial	DO-201AD, Axial	DO-201AA, DO-27, Axial
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 125°C	-65°C ~ 125°C	-55°C ~ 125°C	-65°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	3100 Pcs	2400 Pcs	26834 Pcs	10223 Pcs	1781 Pcs

Engineering Selection Recommendations

Primary Substitute: SB340-E3/73 (Vishay)

The SB340-E3/73 is the direct active equivalent of the obsolete SB340A-E3/73. Both parts share identical electrical specifications and package configuration. The SB340-E3/73 offers superior forward voltage performance (490 mV vs. 500 mV @ 3 A) and maintains ROHS3 compliance. This part is the preferred substitute for direct replacement in existing designs.

Secondary Substitute: 1N5822 (Microchip Technology)

The 1N5822 meets all electrical requirements with superior reverse leakage current performance (100 µA vs. 500 µA @ 40 V). However, this part is RoHS non-compliant and supplied in bulk packaging. The axial package configuration (B) is mechanically compatible with DO-201AD applications. This substitute is suitable for applications where RoHS compliance is not required.

Secondary Substitute: 1N5822-TP (Micro Commercial Co)

The 1N5822-TP provides ROHS3 compliance and DO-201AD package compatibility. Forward voltage specification is 525 mV @ 3 A, which exceeds the original 500 mV limit by 25 mV. Operating temperature range is -55°C to 125°C, which is 10°C narrower at the lower bound compared to the original part. This substitute is acceptable for applications where the elevated forward voltage and reduced low-temperature rating are within system tolerances.

Secondary Substitute: 1N5822RLG (onsemi)

The 1N5822RLG offers ROHS3 compliance and fast recovery performance. However, reverse leakage current is specified at 2 mA @ 40 V, which significantly exceeds the 500 µA specification of the original part. This elevated leakage current may impact circuit performance in applications sensitive to reverse leakage. Package compatibility includes DO-201AA and DO-27 axial configurations. This substitute is suitable only for applications where reverse leakage current is not a critical design parameter.

Frequently Asked Questions (FAQ)

Q: Can the SB340-E3/73 be used as a direct replacement for the SB340A-E3/73?

A: Yes. The SB340-E3/73 is the active equivalent of the obsolete SB340A-E3/73. Both parts share identical voltage and current ratings, fast recovery speed characteristics, and DO-201AD axial package configuration. The SB340-E3/73 demonstrates improved forward voltage performance and maintains ROHS3 compliance.

Q: What is the difference between the 1N5822 variants (bulk, -TP, -G, -RLG)?

A: The variants differ in manufacturer, packaging format, and electrical specifications. The Microchip 1N5822 (bulk) offers superior reverse leakage current (100 µA) but lacks RoHS compliance. The 1N5822-TP (Micro Commercial Co, cut tape) provides ROHS3 compliance with slightly elevated forward voltage (525 mV). The 1N5822RLG (onsemi, cut tape) includes ROHS3 compliance but exhibits significantly higher reverse leakage current (2 mA). The 1N5822G (Microchip, bulk) has incomplete electrical specifications in available documentation.

Q: Are all substitute parts compatible with the original DO-201AD package footprint?

A: The SB340-E3/73 and 1N5822-TP maintain exact DO-201AD package compatibility. The Microchip 1N5822 uses package designation B (axial), which is mechanically compatible with DO-201AD applications. The 1N5822RLG supports DO-201AA, DO-27, and axial packages, all of which are mechanically compatible with DO-201AD through-hole footprints.

Q: Which substitute part has the best reverse leakage current performance?

A: The Microchip 1N5822 (bulk) specifies 100 µA @ 40 V reverse leakage current, which is superior to the original SB340A-E3/73 specification of 500 µA @ 40 V. The SB340-E3/73 and 1N5822-TP maintain the original 500 µA specification. The 1N5822RLG specifies 2 mA @ 40 V, which exceeds all other options.

Q: What is the impact of the 1N5822-TP's 525 mV forward voltage specification?

A: The 1N5822-TP forward voltage specification of 525 mV @ 3 A exceeds the original 500 mV specification by 25 mV (5% increase). This elevated forward voltage results in increased power dissipation in the diode. For a 3 A load, the additional power dissipation is approximately 75 mW. Applications with tight thermal budgets or high-frequency switching should evaluate this impact.

Q: Is RoHS compliance a factor in selecting a substitute?

A: RoHS compliance status is determined by application requirements and regulatory jurisdiction. The SB340-E3/73, 1N5822-TP, and 1N5822RLG are ROHS3 compliant. The Microchip 1N5822 is RoHS non-compliant. Applications subject to RoHS regulations must select from compliant alternatives.

Q: What is the significance of the operating temperature range differences?

A: The original SB340A-E3/73 specifies -65°C to 150°C junction temperature range. The SB340-E3/73, Microchip 1N5822, and 1N5822RLG specify -65°C to 125°C, which is 25°C narrower at the upper limit. The 1N5822-TP specifies -55°C to 125°C, which is 10°C narrower at the lower limit. Applications requiring operation above 125°C or below -55°C must use the original part or verify substitute compatibility with specific temperature requirements.

Q: Which substitute offers the best overall compatibility?

A: The SB340-E3/73 provides the highest compatibility with the original SB340A-E3/73, offering identical electrical specifications, package configuration, and improved forward voltage performance. This part is the recommended substitute for direct replacement in existing designs.

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