SR004 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR004 is an active-status Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 500mA average rectified current in a through-hole DO-204AL (DO-41) axial package. This component is designed for fast-recovery rectification applications requiring low forward voltage drop and rapid switching characteristics. Equivalent and substitute parts are identified based on matching or exceeding the electrical specifications and mechanical compatibility of the original SR004 design.

Key Parameters

Parameter	SR004 Specification
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	500 mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 500 mA
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V
Capacitance @ Vr, F	110pF @ 4V, 1MHz
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SR004 are classified into two functional groups based on allowed electrical and mechanical parameters:

Group 1: Through-Hole DO-41 Axial Package Substitutes (Direct Mechanical Compatibility)

These parts maintain the through-hole DO-204AL (DO-41) axial package format, enabling direct board-level replacement without layout modification. Substitutes in this group include 1N5819-E3/54, 1N5819-E3/73, 1N5819-G, 1N5819-T, 1N5819-TP, and 1N5819RL. All parts in this group operate at 40V DC reverse voltage with 1A average rectified current, exceeding the SR004 current rating of 500mA. Forward voltage characteristics range from 550mV to 600mV at rated current, maintaining compatibility with the SR004 specification of 550mV @ 500mA. Fast-recovery switching speed (≤500ns, >200mA) is consistent across all through-hole substitutes.

Group 2: Surface-Mount Package Substitutes (Functional Equivalence with Package Change)

These parts provide electrical equivalence but require PCB layout modification due to different package formats. The 1N5819HW-7-F operates in SOD-123 surface-mount package with 40V/1A rating and improved forward voltage of 450mV @ 1A. The MBRA340T3G operates in SMA surface-mount package with higher current capability (3A) at 40V, suitable for applications requiring increased current capacity.

Group 3: Higher Voltage Rating Substitute

The 1N5819 from Microchip Technology provides 45V DC reverse voltage rating with 1A current capacity in DO-41 package, offering enhanced voltage margin while maintaining mechanical compatibility.

Key parameters determining substitution eligibility:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40V
Current - Average Rectified (Io): Must equal or exceed 500mA
Technology: Schottky (mandatory)
Speed: Fast Recovery ≤500ns, >200mA (mandatory)
Package compatibility: DO-41 axial for direct replacement; alternative packages for functional substitution

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (Max)	Vf (Max) @ If	Package	Mounting Type	Temp Range	RoHS Status
SR004	Taiwan Semiconductor Corporation	40 V	500 mA	550 mV @ 500 mA	DO-204AL (DO-41)	Through Hole	-55°C ~ 125°C	ROHS3 Compliant
1N5819	Microchip Technology	45 V	1 A	490 mV @ 1 A	DO-204AL, DO-41	Through Hole	-65°C ~ 125°C	Not specified
1N5819-E3/54	Vishay General Semiconductor - Diodes Division	40 V	1 A	600 mV @ 1 A	DO-204AL (DO-41)	Through Hole	-65°C ~ 125°C	ROHS3 Compliant
1N5819-E3/73	Vishay General Semiconductor - Diodes Division	40 V	1 A	600 mV @ 1 A	DO-204AL (DO-41)	Through Hole	-65°C ~ 125°C	ROHS3 Compliant
1N5819-G	Comchip Technology	40 V	1 A	600 mV @ 1 A	DO-204AL, DO-41	Through Hole	-55°C ~ 150°C	ROHS3 Compliant
1N5819-T	Diodes Incorporated	40 V	1 A	600 mV @ 1 A	DO-204AL, DO-41	Through Hole	-65°C ~ 125°C	ROHS3 Compliant
1N5819-TP	Micro Commercial Co	40 V	1 A	600 mV @ 1 A	DO-204AL, DO-41	Through Hole	-55°C ~ 125°C	ROHS3 Compliant
1N5819HW-7-F	Diodes Incorporated	40 V	1 A	450 mV @ 1 A	SOD-123	Surface Mount	-65°C ~ 125°C	ROHS3 Compliant
1N5819RL	STMicroelectronics	40 V	1 A	550 mV @ 1 A	DO-204AL, DO-41	Through Hole	-55°C ~ 150°C	ROHS3 Compliant
MBRA340T3G	onsemi	40 V	3 A	450 mV @ 3 A	DO-214AC (SMA)	Surface Mount	-55°C ~ 150°C	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Through-Hole Replacement (No PCB Layout Changes)

The 1N5819-E3/54, 1N5819-E3/73, 1N5819-T, and 1N5819RL are qualified substitutes maintaining the DO-204AL (DO-41) axial through-hole package. All are ROHS3 compliant and active-status products. The 1N5819-E3/54 and 1N5819-E3/73 from Vishay offer the highest inventory availability (38,300 and 20,784 units respectively) with extended temperature range (-65°C ~ 125°C). The 1N5819-T from Diodes Incorporated provides the largest inventory stock (75,300 units) with equivalent specifications. The 1N5819RL from STMicroelectronics offers the widest operating temperature range (-55°C ~ 150°C) with 5,789 units in stock.

For Enhanced Voltage Margin

The 1N5819 from Microchip Technology provides 45V DC reverse voltage rating compared to the SR004 40V specification, offering additional voltage headroom in applications subject to transient overvoltage. This part is available in DO-41 package with 30,400 units in stock and maintains fast-recovery switching characteristics.

For Surface-Mount Applications

The 1N5819HW-7-F from Diodes Incorporated in SOD-123 package provides superior forward voltage performance (450mV @ 1A) with the highest inventory availability (360,200 units). This part requires PCB layout modification but is suitable for space-constrained designs. The MBRA340T3G from onsemi in SMA package provides 3A current capacity for applications requiring higher current handling with 40V rating and 20,300 units available.

For Extended Temperature Range

The 1N5819-G from Comchip Technology and 1N5819RL from STMicroelectronics both support -55°C ~ 150°C operating range, exceeding the SR004 specification of -55°C ~ 125°C. Both maintain DO-41 package compatibility and ROHS3 compliance.

All recommended substitutes are active-status products with REACH Unaffected status and EAR99 ECCN classification, matching the SR004 regulatory compliance profile.

Frequently Asked Questions (FAQ)

Q: Can the 1N5819-E3/54 directly replace the SR004 without circuit modification?

A: Yes. The 1N5819-E3/54 maintains identical 40V DC reverse voltage rating, DO-204AL (DO-41) axial through-hole package, and fast-recovery Schottky technology. The 1A current rating exceeds the SR004 500mA specification, providing design margin. Forward voltage at 1A (600mV) is compatible with the SR004 specification of 550mV @ 500mA. No circuit modification is required for direct substitution.

Q: What is the difference between 1N5819-E3/54 and 1N5819-E3/73?

A: Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications: 40V rating, 1A current, 600mV forward voltage @ 1A, and DO-41 package. The suffix designations (-E3/54 and -E3/73) indicate different manufacturing date codes or tape reel configurations. Electrical performance and compatibility are equivalent.

Q: Why does the 1N5819HW-7-F have lower forward voltage (450mV) than the SR004 (550mV)?

A: The 1N5819HW-7-F operates in SOD-123 surface-mount package with different die geometry and thermal characteristics compared to the DO-41 through-hole package. Lower forward voltage reflects the different package thermal environment and measurement conditions (450mV @ 1A for SOD-123 versus 550mV @ 500mA for DO-41). Both values are within acceptable Schottky diode performance ranges.

Q: Is the 1N5819 with 45V rating suitable for 40V applications?

A: Yes. The 1N5819 45V DC reverse voltage rating exceeds the SR004 40V requirement, providing additional voltage margin for transient overvoltage protection. The part maintains identical DO-41 package compatibility and fast-recovery switching characteristics. Higher voltage rating does not degrade performance in 40V applications.

Q: Can the MBRA340T3G replace the SR004 in existing PCB designs?

A: No. The MBRA340T3G uses SMA surface-mount package (DO-214AC) instead of the SR004 DO-41 through-hole axial package. PCB layout modification is required. The MBRA340T3G is suitable for new designs requiring surface-mount technology or higher current capacity (3A versus 500mA). Electrical specifications (40V rating, fast-recovery Schottky) are compatible.

Q: What is the temperature range difference between SR004 and substitute parts?

A: The SR004 operates -55°C ~ 125°C. The 1N5819-G and 1N5819RL extend the upper limit to 150°C, providing 25°C additional high-temperature margin. The 1N5819 and 1N5819-E3/54 extend the lower limit to -65°C, providing 10°C additional low-temperature margin. Selection depends on application thermal requirements.

Q: Are all substitute parts ROHS3 compliant like the SR004?

A: All recommended through-hole substitutes (1N5819-E3/54, 1N5819-E3/73, 1N5819-T, 1N5819-TP, 1N5819-G, 1N5819RL) and surface-mount alternatives (1N5819HW-7-F, MBRA340T3G) are ROHS3 compliant. The 1N5819 from Microchip Technology does not specify RoHS status in provided data. All parts maintain REACH Unaffected status matching the SR004 regulatory profile.

Q: What is the reverse leakage current difference between SR004 and substitutes?

A: The SR004 specifies 500µA @ 40V reverse leakage. Most 1N5819 variants specify 1mA @ 40V, representing higher leakage. The 1N5819RL specifies 500µA @ 40V, matching the SR004 exactly. The 1N5819HW-7-F specifies 1mA @ 40V. Higher reverse leakage does not affect rectification performance in typical applications but may impact high-impedance circuits requiring minimal leakage current.

Q: Which substitute offers the best inventory availability?

A: The 1N5819HW-7-F from Diodes Incorporated provides the highest inventory (360,200 units) in SOD-123 surface-mount package. For through-hole DO-41 package, the 1N5819-T from Diodes Incorporated offers 75,300 units. The 1N5819-E3/54 from Vishay provides 38,300 units in DO-41 package with ROHS3 compliance.

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