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SR504 Schottky Diode 40V 5A DO-201AD Equivalent & Substitute Parts
Part Overview
The SR504 is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 5A average rectified current in a through-hole DO-201AD axial package. This component is designed for fast recovery applications with switching speeds ≤500ns and operates across a junction temperature range of -55°C to 125°C. The SR504 is ROHS3 compliant and carries unlimited moisture sensitivity classification.
Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and component availability across multiple manufacturers while maintaining electrical and mechanical compatibility within specified parameter tolerances.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Voltage - DC Reverse (Vr) (Max) | 40 V |
| Current - Average Rectified (Io) | 5 A |
| Voltage - Forward (Vf) (Max) @ If | 550 mV @ 5 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 | -55°C ~ 125°C |
| Technology | Schottky |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the SR504 are classified into two functional categories based on electrical parameter compatibility:
Category 1: Direct Current Rating Equivalents (5A) Parts maintaining the 5A average rectified current specification with identical 40V reverse voltage rating and DO-201AD package form factor. These substitutes provide pin-for-pin and functional equivalence with minimal circuit redesign requirements.
Category 2: Reduced Current Rating Alternatives (3A) Parts rated for 3A average rectified current with matching 40V reverse voltage and DO-201AD package configuration. These substitutes are applicable in circuits where the 5A current requirement can be reduced or where design margins permit lower current ratings.
Substitution eligibility is determined by the following parameters:
- Voltage - DC Reverse (Vr) (Max): 40 V (mandatory match)
- Package / Case: DO-201AD, Axial (mandatory match)
- Mounting Type: Through Hole (mandatory match)
- Technology: Schottky (mandatory match)
- Speed: Fast Recovery ≤500ns, >200mA (Io) (mandatory match)
- Current - Average Rectified (Io): 5A (Category 1) or 3A (Category 2)
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Io (A) | Vf (Max) @ If | Ir @ 40V | Tj (°C) | Packaging | RoHS Status |
|---|---|---|---|---|---|---|---|
| SR504 | Taiwan Semiconductor Corporation | 5 | 550 mV @ 5 A | 500 µA | -55 ~ 125 | Tape & Reel (TR) | ROHS3 Compliant |
| SB540-T | Diodes Incorporated | 5 | 550 mV @ 5 A | 500 µA | -65 ~ 125 | Cut Tape (CT) | ROHS3 Compliant |
| SB540-E3/54 | Vishay General Semiconductor - Diodes Division | 5 | 480 mV @ 5 A | 500 µA | -65 ~ 150 | Cut Tape (CT) | ROHS3 Compliant |
| SB540-E3/73 | Vishay General Semiconductor - Diodes Division | 5 | 480 mV @ 5 A | 500 µA | -65 ~ 150 | Cut Tape (CT) | ROHS3 Compliant |
| 1N5822 | Microchip Technology | 3 | 500 mV @ 3 A | 100 µA | -65 ~ 125 | Bulk | RoHS non-compliant |
| 1N5822-E3/54 | Vishay General Semiconductor - Diodes Division | 3 | 525 mV @ 3 A | 2 mA | -65 ~ 125 | Cut Tape (CT) | ROHS3 Compliant |
| 1N5822-E3/73 | Vishay General Semiconductor - Diodes Division | 3 | 525 mV @ 3 A | 2 mA | -65 ~ 125 | Cut Tape (CT) | ROHS3 Compliant |
| 1N5822-TP | Micro Commercial Co | 3 | 525 mV @ 3 A | 500 µA | -55 ~ 125 | Cut Tape (CT) | ROHS3 Compliant |
| 1N5822RL | STMicroelectronics | 3 | 525 mV @ 3 A | 2 mA | -65 ~ 150 | Cut Tape (CT) | ROHS3 Compliant |
| SB340-E3/54 | Vishay General Semiconductor - Diodes Division | 3 | 490 mV @ 3 A | 500 µA | -65 ~ 125 | Cut Tape (CT) | ROHS3 Compliant |
| SB340-E3/73 | Vishay General Semiconductor - Diodes Division | 3 | 490 mV @ 3 A | 500 µA | -65 ~ 125 | Cut Tape (CT) | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (5A Rating)
The SB540-T, SB540-E3/54, and SB540-E3/73 maintain the 5A current specification and provide direct functional equivalence to the SR504. All three parts are ROHS3 compliant and active products. The SB540-E3/54 and SB540-E3/73 offer extended junction temperature ratings to 150°C compared to the SR504's 125°C maximum, providing additional thermal margin in high-temperature applications. Forward voltage characteristics are comparable across all 5A-rated options, with SB540 variants showing slightly lower Vf (480 mV) than the SR504 (550 mV), resulting in reduced power dissipation.
Reduced Current Alternatives (3A Rating)
The 1N5822 series and SB340 series parts are rated for 3A average rectified current and are applicable where circuit design permits reduced current capacity. All 3A alternatives maintain the 40V reverse voltage specification and DO-201AD package form factor. The 1N5822-TP and SB340-E3/54 variants match the SR504's reverse leakage specification of 500 µA at 40V. The 1N5822-E3/54, 1N5822-E3/73, and 1N5822RL variants exhibit lower reverse leakage (2 mA) and are ROHS3 compliant. The Microchip 1N5822 in bulk packaging is RoHS non-compliant and is not recommended for new designs requiring regulatory compliance.
Compliance and Availability
All recommended substitutes are active products with ROHS3 compliance except the Microchip 1N5822 bulk variant. Packaging options include Cut Tape (CT) and Tape & Reel (TR) configurations to support both manual assembly and automated production workflows. Inventory availability ranges from 1,711 to 4,300 units across substitute options.
Frequently Asked Questions (FAQ)
Q: Can the 3A-rated 1N5822 series parts replace the 5A SR504 in all applications?
A: The 1N5822 series parts are suitable only for applications where the circuit current requirement does not exceed 3A. The SR504 is rated for 5A average rectified current; substitution with lower-rated parts requires circuit analysis to confirm that peak and average current demands remain within the 3A specification. Direct substitution without current verification is not appropriate.
Q: What is the difference between SB540-E3/54 and SB540-E3/73 variants?
A: Both SB540-E3/54 and SB540-E3/73 are manufactured by Vishay and share identical electrical specifications: 40V reverse voltage, 5A current rating, 480 mV forward voltage at 5A, and -65°C to 150°C junction temperature range. The designations /54 and /73 represent different tape reel configurations for automated assembly. Selection between these variants depends on production equipment compatibility and tape specifications rather than electrical performance.
Q: Is the SR504 packaging format compatible with all substitute parts?
A: The SR504 is supplied in Tape & Reel (TR) packaging, while most substitute parts are available in Cut Tape (CT) or bulk packaging. All parts share the identical DO-201AD axial through-hole package form factor, ensuring mechanical and pin compatibility on printed circuit boards. Packaging format differences affect only component handling and assembly processes, not circuit functionality or board-level compatibility.
Q: Why do some substitute parts show lower forward voltage than the SR504?
A: Forward voltage variation within the Schottky diode category is a normal manufacturing characteristic. The SB540-E3/54 and SB540-E3/73 variants specify 480 mV forward voltage at 5A compared to the SR504's 550 mV. Lower forward voltage results in reduced power dissipation and heat generation during operation. Circuit designs that account for forward voltage tolerance ranges accommodate these variations without performance degradation.
Q: Are all substitute parts suitable for high-temperature applications?
A: The SB540-E3/54, SB540-E3/73, and 1N5822RL variants support extended junction temperature ranges to 150°C, compared to the SR504's 125°C maximum. Applications requiring operation above 125°C should specify these higher-temperature-rated alternatives. The 1N5822-E3/54, 1N5822-E3/73, and most other 3A alternatives are limited to 125°C maximum junction temperature, matching the SR504 specification.
Q: What is the significance of reverse leakage current differences among substitute parts?
A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias condition. The SR504 specifies 500 µA at 40V. Some alternatives such as 1N5822-E3/54 and 1N5822-E3/73 specify 2 mA reverse leakage, which is higher but remains within acceptable ranges for most rectification applications. Applications sensitive to leakage current, such as precision analog circuits or high-impedance measurement systems, should select parts with lower Ir specifications.
Q: Can packaging format affect circuit performance?
A: Packaging format (Tape & Reel, Cut Tape, or Bulk) affects component handling, storage, and assembly processes but does not alter electrical performance or circuit functionality. All substitute parts in DO-201AD axial through-hole configuration provide identical electrical behavior on the circuit board regardless of supply packaging format.
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