SB540 Schottky Diode 40V 5A Equivalent & Substitute Parts

Part Overview

The SB540 is a through-hole Schottky rectifier diode manufactured by onsemi, rated for 40V DC reverse voltage and 5A average rectified current in a DO-201AD axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SB540 operates across a junction temperature range of -55°C to 150°C and exhibits fast recovery characteristics suitable for high-frequency rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 5 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SB540 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40V
Current - Average Rectified (Io): 5A
Technology: Schottky
Mounting Type: Through Hole
Package / Case: DO-201AD, Axial

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 550 mV @ 5 A (or lower)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 40 V (or lower)
Operating Temperature - Junction: -55°C to 150°C (or wider range)
RoHS3 Compliance

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and mechanical specifications) and Functional Equivalents (meet all critical parameters with minor variations in secondary characteristics).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 5A [mV]	Reverse Leakage @ 40V [µA]	Package	Temp Range [°C]	Product Status
SB540	onsemi	40	5	550	500	DO-201AD	-55 to 150	Obsolete
SB540-E3/54	Vishay General Semiconductor	40	5	480	500	DO-201AD	-65 to 150	Active
SB540-T	Diodes Incorporated	40	5	550	500	DO-201AD	-65 to 125	Active
SB540B-G	Comchip Technology	40	5	550	500	DO-201AD	-65 to 125	Active
SB540E-G	Comchip Technology	40	5	550	500	DO-201AD	-65 to 125	Active
SR504	Taiwan Semiconductor Corporation	40	5	550	500	DO-201AD	-55 to 125	Active
SR504H	Taiwan Semiconductor Corporation	40	5	550	500	DO-201AD	-55 to 125	Active
SR504 A0G	Taiwan Semiconductor Corporation	40	5	550	500	DO-201AD	-55 to 150	Active
1N5825	Microchip Technology	40	5	380	10	Axial	Not Specified	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The following parts are direct functional equivalents to the SB540 and are suitable for immediate substitution:

SB540E-G (Comchip Technology): Active product status with identical electrical specifications. Available in Cut Tape packaging with 24,552 units in stock. Maintains 550 mV forward voltage and 500 µA reverse leakage characteristics.
SR504 A0G (Taiwan Semiconductor Corporation): Active product with matching electrical parameters and extended temperature range (-55°C to 150°C). Available in Cut Tape packaging with 2,101 units in stock. Provides superior high-temperature performance.
SB540-E3/54 (Vishay General Semiconductor): Active product with superior forward voltage performance (480 mV @ 5A, 70 mV lower than original). Extended temperature range (-65°C to 150°C). Available in Cut Tape packaging with 4,300 units in stock.

Secondary Equivalents (Conditional Substitutes):

SB540-T (Diodes Incorporated): Active product with identical forward voltage specification. Temperature range limited to -65°C to 125°C. Available in Cut Tape packaging with 3,800 units in stock.
SB540B-G (Comchip Technology): Active product with identical electrical specifications. Temperature range -65°C to 125°C. Available in Bulk packaging with 842 units in stock.
SR504 (Taiwan Semiconductor Corporation): Active product with identical electrical specifications. Temperature range -55°C to 125°C. Available in Tape & Reel packaging with 2,300 units in stock.
SR504H (Taiwan Semiconductor Corporation): Active product with AEC-Q101 automotive qualification. Identical electrical specifications. Temperature range -55°C to 125°C. Available in Tape & Reel packaging with 703 units in stock.

Alternative Substitute (Different Package Variant):

1N5825 (Microchip Technology): Active product with superior reverse leakage performance (10 µA @ 40V, 50× lower than original). Forward voltage reduced to 380 mV @ 5A. TOP HAT package variant. Available in Bulk packaging with 3,308 units in stock. Suitable for applications where lower forward voltage drop is beneficial.

All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original SB540.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SB540 with any of the listed parts without circuit modification?

A: Yes, all listed substitute parts meet the critical electrical parameters (40V reverse voltage, 5A average rectified current, fast recovery Schottky technology) and through-hole DO-201AD mounting. Direct substitution is possible without circuit modification. However, verify your application's temperature requirements and forward voltage drop tolerance before selection.

Q: What is the difference between SB540E-G and SR504 A0G?

A: Both parts are direct electrical equivalents with identical 40V/5A ratings and 550 mV forward voltage. The primary difference is the temperature range: SB540E-G operates -65°C to 125°C, while SR504 A0G extends to 150°C maximum junction temperature. Select SR504 A0G for applications requiring higher temperature operation.

Q: Why does SB540-E3/54 show lower forward voltage (480 mV) than the original SB540 (550 mV)?

A: Forward voltage variation within the Schottky diode family is a normal manufacturing characteristic. The 480 mV specification for SB540-E3/54 represents superior performance and is fully compatible with the original design. Lower forward voltage reduces power dissipation in rectification circuits.

Q: Is SR504H suitable for automotive applications?

A: Yes. SR504H carries AEC-Q101 automotive qualification and is suitable for automotive-grade applications. All other substitute parts are industrial-grade components without automotive certification.

Q: What is the difference between Cut Tape (CT), Tape & Reel (TR), and Bulk packaging?

A: Packaging affects procurement and assembly processes. Cut Tape (CT) provides individual component strips suitable for manual or semi-automated assembly. Tape & Reel (TR) is optimized for high-volume automated pick-and-place assembly. Bulk packaging is used for manual assembly or small-quantity applications. Electrical performance is identical across all packaging variants.

Q: Can I use 1N5825 as a direct replacement for SB540?

A: 1N5825 meets the critical voltage and current ratings (40V/5A) but differs in reverse leakage (10 µA versus 500 µA) and forward voltage (380 mV versus 550 mV). These differences are beneficial for power efficiency but may affect circuit behavior in applications sensitive to leakage current. Verify compatibility with your specific circuit design before substitution.

Q: Which substitute part has the highest inventory availability?

A: SB540E-G (Comchip Technology) has the highest inventory with 24,552 units in stock, followed by SB540-E3/54 (Vishay) with 4,300 units. Both are active products with immediate availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance consistent with the original SB540, ensuring compatibility with modern manufacturing and environmental regulations.

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