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SR804H Schottky Diode Equivalent & Substitute Parts
Part Overview
The SR804H is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40 V DC reverse voltage and 8 A average rectified current in a DO-201AD through-hole axial package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter ranges.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) (Max) | 40 | V |
| Current - Average Rectified (Io) | 8 | A |
| Voltage - Forward (Vf) (Max) @ If | 550 mV @ 8 A | mV |
| Speed | Fast Recovery ≤ 500ns, > 200mA (Io) | ns |
| Current - Reverse Leakage @ Vr | 500 | µA @ 40 V |
| Technology | Schottky | — |
| Mounting Type | Through Hole | — |
| Package / Case | DO-201AD, Axial | — |
| Operating Temperature - Junction | -55 to 125 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Grade | Automotive | — |
| Qualification | AEC-Q101 | — |
Substitute Part Grouping Explanation
Substitution of the SR804H is determined by the following critical parameters:
Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 40 V or greater to ensure equivalent or superior voltage withstand capability.
Current Rating: The SR804H is rated for 8 A average rectified current. Substitute parts with current ratings of 8 A or higher are electrically equivalent. Parts rated below 8 A (such as 3 A or 5 A variants) operate within reduced current capacity and are not direct substitutes but may be used in applications with lower current requirements.
Technology: All substitute parts utilize Schottky diode technology, ensuring consistent fast recovery characteristics and forward voltage behavior.
Package: All substitute parts use the DO-201AD axial through-hole package, ensuring mechanical and pin compatibility.
Operating Temperature Range: The SR804H operates from -55°C to 125°C. Substitute parts with equal or wider temperature ranges maintain thermal compatibility.
Compliance: ROHS3 compliance and REACH unaffected status are maintained across all substitute parts listed.
Substitute parts are grouped into two categories: Full Current Equivalents (8 A or higher) and Reduced Current Variants (3 A to 5 A), with the latter suitable only for applications with lower current demands.
Parameter Comparison
| Part Number | Manufacturer | Vr (Max) [V] | Io [A] | Vf (Max) [mV] | Package | Tj Range [°C] | RoHS Status |
|---|---|---|---|---|---|---|---|
| SR804H | Taiwan Semiconductor Corporation | 40 | 8 | 550 @ 8A | DO-201AD | -55 to 125 | ROHS3 |
| 1N5822 | Microchip Technology | 40 | 3 | 500 @ 3A | B, Axial | -65 to 125 | Non-compliant |
| 1N5822-E3/54 | Vishay General Semiconductor | 40 | 3 | 525 @ 3A | DO-201AD | -65 to 125 | ROHS3 |
| 1N5822-E3/73 | Vishay General Semiconductor | 40 | 3 | 525 @ 3A | DO-201AD | -65 to 125 | ROHS3 |
| 1N5822-TP | Micro Commercial Co | 40 | 3 | 525 @ 3A | DO-201AD | -55 to 125 | ROHS3 |
| 1N5822RL | STMicroelectronics | 40 | 3 | 525 @ 3A | DO-201AD | Max 150 | ROHS3 |
| SB340-E3/54 | Vishay General Semiconductor | 40 | 3 | 490 @ 3A | DO-201AD | -65 to 125 | ROHS3 |
| SB340-E3/73 | Vishay General Semiconductor | 40 | 3 | 490 @ 3A | DO-201AD | -65 to 125 | ROHS3 |
| SB540-E3/54 | Vishay General Semiconductor | 40 | 5 | 480 @ 5A | DO-201AD | -65 to 150 | ROHS3 |
| SB540-E3/73 | Vishay General Semiconductor | 40 | 5 | 480 @ 5A | DO-201AD | -65 to 150 | ROHS3 |
| SB540-T | Diodes Incorporated | 40 | 5 | 550 @ 5A | DO-201AD | -65 to 125 | ROHS3 |
Engineering Selection Recommendations
Full Current Equivalents (8 A Rating): No substitute parts with 8 A or higher current rating are provided in the available dataset. The SR804H remains the primary selection for applications requiring 8 A rectified current capacity.
Reduced Current Variants (3 A to 5 A): The following substitute parts are suitable for applications with lower current requirements:
3 A Variants: 1N5822-E3/54, 1N5822-E3/73, 1N5822-TP, 1N5822RL, SB340-E3/54, and SB340-E3/73 all maintain 40 V voltage rating, DO-201AD package compatibility, and ROHS3 compliance. These parts are interchangeable with each other within 3 A current applications.
5 A Variants: SB540-E3/54, SB540-E3/73, and SB540-T maintain 40 V voltage rating, DO-201AD package compatibility, and ROHS3 compliance. These parts provide intermediate current capacity between 3 A and 8 A ratings.
Compliance Considerations: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the SR804H. The 1N5822 variant from Microchip Technology is RoHS non-compliant and should not be selected for applications requiring regulatory compliance.
Automotive Grade: The SR804H carries AEC-Q101 automotive qualification. Substitute parts do not explicitly list automotive qualification in the provided data; selection for automotive applications should be based on application-specific requirements and design validation.
Temperature Range: The SR804H operates from -55°C to 125°C. Most substitute parts extend the lower temperature limit to -65°C, providing wider thermal operating range. The SB540-E3/54 and SB540-E3/73 extend the upper temperature limit to 150°C.
Frequently Asked Questions (FAQ)
Q: Can a 3 A rated diode substitute for the 8 A SR804H?
A: No. The 3 A variants (1N5822 series and SB340 series) are rated for maximum 3 A average rectified current, which is insufficient for applications requiring 8 A. Using an undersized diode results in thermal stress, reduced component life, and potential circuit failure. These parts are suitable only for applications with 3 A or lower current requirements.
Q: Can a 5 A rated diode substitute for the 8 A SR804H?
A: No. The 5 A variants (SB540 series) are rated for maximum 5 A average rectified current. While closer to the 8 A requirement, they remain undersized and unsuitable for full 8 A operation. These parts are suitable for applications with 5 A or lower current requirements.
Q: Are all substitute parts compatible with the DO-201AD package?
A: Most substitute parts use the DO-201AD axial through-hole package, ensuring mechanical compatibility. The 1N5822 variant from Microchip Technology uses package designation "B, Axial," which differs from DO-201AD. Verify package compatibility with PCB footprint requirements before selection.
Q: What is the difference between 1N5822-E3/54 and 1N5822-E3/73?
A: Both parts are identical in electrical specifications (40 V, 3 A, 525 mV forward voltage, DO-201AD package, ROHS3 compliant). The suffix designations (-E3/54 and -E3/73) indicate different tape reel configurations or manufacturing date codes from Vishay. Electrical performance and compatibility are equivalent.
Q: Why is the 1N5822 from Microchip Technology listed as RoHS non-compliant?
A: The 1N5822 from Microchip Technology does not meet ROHS3 compliance requirements. For applications requiring regulatory compliance with RoHS directives, this part should not be selected. All other substitute parts listed maintain ROHS3 compliance.
Q: Can the SR804H be used in place of a 3 A or 5 A application?
A: Yes. The SR804H, rated for 8 A, can be used in applications requiring 3 A or 5 A current. The higher current rating provides design margin and does not degrade performance in lower-current applications. However, this approach may result in unnecessary cost and board space utilization.
Q: What is the significance of forward voltage (Vf) differences between substitute parts?
A: Forward voltage varies between 480 mV and 550 mV across the substitute parts at their respective rated currents. Lower forward voltage reduces power dissipation and heat generation. The SR804H specifies 550 mV @ 8 A. Substitute parts with lower Vf (such as SB540 variants at 480 mV @ 5 A) provide improved efficiency but operate at different current levels.
Q: Are all substitute parts suitable for automotive applications?
A: The SR804H carries explicit AEC-Q101 automotive qualification. Substitute parts do not list automotive qualification in the provided specifications. For automotive applications, design validation and qualification assessment are required before substitution.
Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?
A: Cut Tape (CT) packaging provides individual component strips suitable for manual assembly or small-volume production. Tape & Reel (TR) packaging provides continuous reel format suitable for automated assembly equipment. Both formats contain identical electrical components; packaging selection depends on assembly process requirements.
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