SR304 Schottky Diode 40V 3A DO-201AD Equivalent & Substitute Parts

Part Overview

The SR304 is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 3A average rectified current in a DO-201AD axial through-hole package. This component is designed for fast recovery applications with switching speeds ≤500ns at currents >200mA. The SR304 is ROHS3 compliant and carries unlimited moisture sensitivity classification (MSL 1), making it suitable for standard industrial and commercial applications. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and thermal operating ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Maximum @ If	550 mV @ 3 A	mV @ A
Speed - Fast Recovery	≤500ns, >200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40V
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

Substitute parts for the SR304 are classified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters (Must Match):

Voltage - DC Reverse (Vr) Maximum: 40V
Mounting Type: Through Hole
Package / Case: DO-201AD, Axial
Technology: Schottky
Speed: Fast Recovery ≤500ns, >200mA (Io)

Secondary Parameters (Allowable Variation):

Current - Average Rectified (Io): 3A nominal (3.3A acceptable for higher current margin)
Voltage - Forward (Vf) @ If: 490–570 mV @ 3A (within acceptable forward voltage range)
Current - Reverse Leakage @ Vr: 100 µA to 2 mA @ 40V (within acceptable leakage specification)
Operating Temperature - Junction: -65°C to 150°C (encompasses SR304 range of -55°C to 125°C)

Compliance Parameters:

RoHS Status: ROHS3 Compliant preferred
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected or REACH Affected acceptable

Parts are grouped as Direct Equivalents, Upgrades, or Similar alternatives based on how closely they match the SR304 specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV @ If	Reverse Leakage µA @ 40V	Tj (°C)	Package	RoHS Status	Inventory (Pcs)
SR304	Taiwan Semiconductor Corporation	40	3	550 @ 3A	500	-55 to 125	DO-201AD	ROHS3	11500
1N5822-TP	Micro Commercial Co	40	3	525 @ 3A	500	-55 to 125	DO-201AD	ROHS3	10223
SB340E-G	Comchip Technology	40	3	500 @ 3A	500	-65 to 125	DO-201AD	ROHS3	13306
1N5822	Microchip Technology	40	3	500 @ 3A	100	-65 to 125	B, Axial	Non-compliant	26834
1N5822-E3/54	Vishay General Semiconductor - Diodes Division	40	3	525 @ 3A	2000	-65 to 125	DO-201AD	ROHS3	2023
1N5822-E3/73	Vishay General Semiconductor - Diodes Division	40	3	525 @ 3A	2000	-65 to 125	DO-201AD	ROHS3	3130
1N5822RL	STMicroelectronics	40	3	525 @ 3A	2000	-55 to 150	DO-201AD	ROHS3	2000
31DQ04	SMC Diode Solutions	40	3.3	570 @ 3A	1000	-40 to 150	DO-201AD	ROHS3	12400
SB340-E3/54	Vishay General Semiconductor - Diodes Division	40	3	490 @ 3A	500	-65 to 125	DO-201AD	ROHS3	1711
SB340-E3/73	Vishay General Semiconductor - Diodes Division	40	3	490 @ 3A	500	-65 to 125	DO-201AD	ROHS3	2400
SB540-E3/54	Vishay General Semiconductor - Diodes Division	40	5	480 @ 5A	500	-65 to 150	DO-201AD	ROHS3	4300

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The 1N5822-TP (Micro Commercial Co) and SB340E-G (Comchip Technology) are direct functional equivalents to the SR304. Both maintain the 40V/3A rating, DO-201AD package, and ROHS3 compliance. The 1N5822-TP exhibits forward voltage of 525 mV @ 3A, while the SB340E-G provides improved performance at 500 mV @ 3A. Both support the full operating temperature range of the SR304 or extended ranges. These parts are suitable for one-to-one replacement in existing designs.

Upgrade Options (Enhanced Performance):

The SB340-E3/54 and SB340-E3/73 (Vishay General Semiconductor - Diodes Division) offer lower forward voltage (490 mV @ 3A) compared to the SR304 (550 mV @ 3A), resulting in reduced power dissipation. Both maintain 40V/3A ratings, DO-201AD packaging, and ROHS3 compliance with extended temperature range (-65°C to 125°C). These parts are suitable for applications requiring improved efficiency.

Similar Parts (Extended Current Rating):

The 31DQ04 (SMC Diode Solutions) provides a higher current rating of 3.3A at 40V in the same DO-201AD package. This part is suitable for applications requiring additional current margin while maintaining voltage compatibility. Forward voltage is 570 mV @ 3A. Operating temperature range extends to 150°C maximum junction temperature.

Higher Current Alternative:

The SB540-E3/54 (Vishay General Semiconductor - Diodes Division) is rated for 5A at 40V in the DO-201AD package. This part is suitable only for applications where the higher current rating is required, as it represents a different device class. Forward voltage is 480 mV @ 5A. ROHS3 compliant with extended temperature range (-65°C to 150°C).

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity classification. The 1N5822 (Microchip Technology, Bulk packaging) is RoHS non-compliant and should be avoided in applications requiring RoHS certification. The 31DQ04 carries REACH Affected status, whereas all other alternatives are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can the 1N5822-TP be used as a direct replacement for the SR304?

A: Yes. The 1N5822-TP matches the SR304 in voltage rating (40V), current rating (3A), package type (DO-201AD), and technology (Schottky). Forward voltage is 525 mV @ 3A compared to 550 mV @ 3A for the SR304, representing acceptable variation. Both are ROHS3 compliant with MSL 1 classification.

Q: What is the difference between the SB340E-G and SB340-E3/54?

A: Both parts are manufactured by different divisions or carry different packaging designations. The SB340E-G is supplied by Comchip Technology with forward voltage of 500 mV @ 3A. The SB340-E3/54 is supplied by Vishay General Semiconductor - Diodes Division with forward voltage of 490 mV @ 3A. Both maintain 40V/3A ratings and DO-201AD packaging. The SB340-E3/54 offers slightly lower forward voltage for improved efficiency.

Q: Is the 31DQ04 a suitable substitute for the SR304?

A: The 31DQ04 is suitable for applications where the SR304 is used and additional current margin is beneficial. The 31DQ04 is rated for 3.3A at 40V compared to the SR304's 3A rating. Both use the DO-201AD package. Forward voltage is 570 mV @ 3A for the 31DQ04 versus 550 mV @ 3A for the SR304. Operating temperature range extends to 150°C for the 31DQ04 versus 125°C for the SR304. REACH status differs: 31DQ04 is REACH Affected.

Q: Why is the 1N5822 (Microchip Technology, Bulk) not recommended?

A: The 1N5822 from Microchip Technology in Bulk packaging is RoHS non-compliant, whereas the SR304 is ROHS3 compliant. Additionally, the package designation is listed as "B, Axial" rather than the standard "DO-201AD" designation. For applications requiring RoHS certification, this part should not be selected.

Q: Can the SB540-E3/54 replace the SR304?

A: The SB540-E3/54 is not a direct replacement. While it maintains the 40V voltage rating and DO-201AD package, it is rated for 5A average rectified current compared to the SR304's 3A rating. This part represents a higher current device class and should only be selected when the application requires the additional 5A current capacity. Forward voltage is 480 mV @ 5A, which is not directly comparable to the SR304's 550 mV @ 3A specification.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by: (1) Voltage - DC Reverse rating of 40V, (2) Mounting type of Through Hole, (3) Package type of DO-201AD Axial, (4) Technology classification as Schottky, (5) Fast Recovery speed specification of ≤500ns at >200mA. Secondary parameters include forward voltage within 490–570 mV @ 3A, reverse leakage within 100 µA to 2 mA @ 40V, and operating temperature range encompassing -55°C to 125°C. Current rating of 3A is nominal; 3.3A is acceptable for higher margin applications.

Q: Are there packaging differences between substitute parts?

A: Most substitute parts use DO-201AD axial through-hole packaging identical to the SR304. The 1N5822-TP is supplied in Cut Tape (CT) packaging, while the SR304 is supplied in Tape & Reel (TR) packaging. Both are compatible with the same through-hole assembly processes. The 1N5822 from Microchip Technology uses "B, Axial" designation, which differs from the standard DO-201AD designation and should be verified for mechanical compatibility.

Q: Which substitute offers the best forward voltage performance?

A: The SB540-E3/54 offers the lowest forward voltage at 480 mV @ 5A. For 3A-rated devices, the SB340-E3/54 and SB340-E3/73 both offer 490 mV @ 3A, compared to the SR304's 550 mV @ 3A. Lower forward voltage reduces power dissipation and heat generation in the application circuit.

Q: What is the inventory status of substitute parts?

A: The SB340E-G (Comchip Technology) has the highest inventory at 13,306 pieces. The 1N5822 (Microchip Technology) has 26,834 pieces but is RoHS non-compliant. Among ROHS3-compliant direct equivalents, the 1N5822-TP has 10,223 pieces in stock. The SB340-E3/54 has the lowest inventory at 1,711 pieces among recommended upgrades.

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