SR804 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR804 is an active-status 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 designed for fast-recovery rectification applications requiring low forward voltage drop and rapid switching characteristics. Substitute parts become necessary when the primary part is unavailable, when alternative packaging formats are required, or when design specifications permit operation at reduced current ratings with equivalent voltage and thermal performance.

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
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SR804 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 40 V to ensure equivalent reverse-bias protection and circuit safety margins.

Package and Mounting: All substitute parts must use the DO-201AD through-hole axial package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Technology: All substitute parts must employ Schottky diode technology to maintain fast-recovery characteristics and low forward voltage drop performance.

Current Rating: Substitute parts are grouped into two categories based on average rectified current capacity:

3 A rated parts (1N5822 series, SB340 series): Suitable for applications where the circuit design permits operation at reduced current capacity below the 8 A specification of the SR804.
5 A rated parts (SB540 series): Suitable for applications requiring intermediate current capacity between 3 A and 8 A.

Compliance and Certifications: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the primary part.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Package	Tj (°C)	RoHS Status
SR804	Taiwan Semiconductor Corporation	40 V	8	550 mV @ 8 A	DO-201AD	-55 to 125	ROHS3
1N5822	Microchip Technology	40 V	3	500 mV @ 3 A	B, Axial	-65 to 125	Non-compliant
1N5822-E3/54	Vishay General Semiconductor	40 V	3	525 mV @ 3 A	DO-201AD	-65 to 125	ROHS3
1N5822-E3/73	Vishay General Semiconductor	40 V	3	525 mV @ 3 A	DO-201AD	-65 to 125	ROHS3
1N5822-TP	Micro Commercial Co	40 V	3	525 mV @ 3 A	DO-201AD	-55 to 125	ROHS3
1N5822RL	STMicroelectronics	40 V	3	525 mV @ 3 A	DO-201AD	150 (Max)	ROHS3
SB340-E3/54	Vishay General Semiconductor	40 V	3	490 mV @ 3 A	DO-201AD	-65 to 125	ROHS3
SB340-E3/73	Vishay General Semiconductor	40 V	3	490 mV @ 3 A	DO-201AD	-65 to 125	ROHS3
SB540-E3/54	Vishay General Semiconductor	40 V	5	480 mV @ 5 A	DO-201AD	-65 to 150	ROHS3
SB540-E3/73	Vishay General Semiconductor	40 V	5	480 mV @ 5 A	DO-201AD	-65 to 150	ROHS3
SB540-T	Diodes Incorporated	40 V	5	550 mV @ 5 A	DO-201AD	-65 to 125	ROHS3

Engineering Selection Recommendations

Direct Substitution (DO-201AD Package Match):

The 1N5822-E3/54, 1N5822-E3/73, 1N5822-TP, 1N5822RL, SB340-E3/54, SB340-E3/73, SB540-E3/54, SB540-E3/73, and SB540-T parts maintain identical DO-201AD package geometry and through-hole mounting compatibility with the SR804. All listed substitutes are active-status products with ROHS3 compliance and REACH unaffected certification.

Current Rating Considerations:

The 1N5822 series and SB340 series parts are rated for 3 A average rectified current. These substitutes are applicable only in circuit designs where the maximum current demand does not exceed 3 A. The SB540 series parts are rated for 5 A average rectified current and provide intermediate capacity between the 3 A and 8 A ratings.

Voltage and Thermal Performance:

All substitute parts maintain the 40 V DC reverse voltage rating of the SR804. The SB540-E3/54 and SB540-E3/73 parts extend the maximum junction temperature to 150°C, compared to the SR804 specification of 125°C, providing enhanced thermal margin in high-temperature operating environments.

Compliance Status:

The 1N5822 part from Microchip Technology is RoHS non-compliant and should not be selected for applications requiring RoHS3 compliance. All other substitute parts listed maintain ROHS3 compliance status.

Forward Voltage Characteristics:

The SB340 and SB540 series parts exhibit lower forward voltage drops (480–490 mV at rated current) compared to the SR804 (550 mV @ 8 A), resulting in reduced power dissipation in rectification circuits. The 1N5822 series parts exhibit forward voltage drops between 500–525 mV at 3 A.

Frequently Asked Questions (FAQ)

Q: Can the 1N5822-E3/54 be used as a direct replacement for the SR804 in all applications?

A: The 1N5822-E3/54 maintains the same 40 V voltage rating and DO-201AD package as the SR804. However, it is rated for 3 A average rectified current, compared to the SR804's 8 A rating. Direct substitution is only valid in circuits where the maximum current demand does not exceed 3 A. Exceeding this current rating will result in component failure and circuit malfunction.

Q: What is the difference between the SB340 and SB540 series parts?

A: Both series maintain the 40 V voltage rating and DO-201AD package. The primary difference is current rating: SB340 parts are rated for 3 A, while SB540 parts are rated for 5 A. The SB540 series also exhibits lower forward voltage drops (480 mV @ 5 A) compared to the SB340 series (490 mV @ 3 A), resulting in reduced power dissipation.

Q: Are all substitute parts RoHS3 compliant?

A: No. The 1N5822 part from Microchip Technology is RoHS non-compliant. All other substitute parts listed (1N5822-E3/54, 1N5822-E3/73, 1N5822-TP, 1N5822RL, SB340-E3/54, SB340-E3/73, SB540-E3/54, SB540-E3/73, and SB540-T) maintain ROHS3 compliance status.

Q: What is the significance of the "-E3/54" and "-E3/73" suffixes in Vishay part numbers?

A: These suffixes indicate different packaging and tape configurations for the same electrical specifications. The "-E3/54" and "-E3/73" designations represent different reel sizes and tape formats used in automated assembly processes. The electrical parameters and DO-201AD package geometry remain identical between these variants.

Q: Can the SB540-E3/54 be used in place of the SR804 for 8 A applications?

A: The SB540-E3/54 is rated for 5 A average rectified current, which is below the 8 A requirement of the SR804. Using this part in an 8 A application will exceed its current rating and result in component failure. The SB540-E3/54 is suitable only for applications requiring up to 5 A.

Q: How do the operating temperature ranges compare between the SR804 and substitute parts?

A: The SR804 operates from -55°C to 125°C junction temperature. Most substitute parts extend the lower temperature limit to -65°C. The SB540-E3/54 and SB540-E3/73 extend the upper temperature limit to 150°C, providing enhanced thermal performance in high-temperature environments. The 1N5822RL specifies a maximum junction temperature of 150°C without a lower limit specification.

Q: What is the impact of forward voltage differences between the SR804 and substitute parts?

A: The SR804 exhibits a forward voltage of 550 mV @ 8 A. Substitute parts range from 480–525 mV at their respective current ratings. Lower forward voltage results in reduced power dissipation and heat generation in rectification circuits. However, forward voltage specifications are only directly comparable at identical current levels. The 3 A and 5 A rated parts cannot be directly compared to the 8 A specification without accounting for current scaling effects.

Q: Is the 1N5822 part from Microchip Technology in a different package than the SR804?

A: Yes. The Microchip 1N5822 is specified in a "B, Axial" package, which differs from the DO-201AD package of the SR804. This package difference may result in incompatibility with existing PCB layouts and assembly processes. The 1N5822-E3/54, 1N5822-E3/73, and 1N5822-TP variants from other manufacturers maintain the DO-201AD package and are mechanically compatible with the SR804.

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