SR004 A0G Equivalent & Substitute Parts

Part Overview

The SR004 A0G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40 V DC reverse voltage and 500 mA average rectified current in a through-hole DO-204AL (DO-41) package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or design flexibility across multiple suppliers.

Key Parameters

Parameter	SR004 A0G
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	500 mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 500 mA
Technology	Schottky
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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SR004 A0G are grouped based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V or higher
Current - Average Rectified (Io): 500 mA or higher
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole or Surface Mount (with package compatibility consideration)
Package / Case: DO-204AL, DO-41 (through-hole variants) or equivalent surface-mount alternatives

Substitution Logic: Parts with identical or superior voltage and current ratings, matching Schottky technology, and compatible fast recovery speed characteristics are classified as direct substitutes. Through-hole variants (DO-41, DO-204AL) are interchangeable within the same package family. Surface-mount variants (SOD-123, SMA) represent functional equivalents for applications permitting PCB layout modification. All substitute parts maintain ROHS3 compliance and REACH unaffected status.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Mounting Type	Operating Temp (Junction)	RoHS Status
SR004 A0G	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-E3/53	Vishay General Semiconductor - Diodes Division	40 V	1 A	900 mV @ 3.1 A	DO-204AL, DO-41	Through Hole	-65°C ~ 125°C	ROHS3 Compliant
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

Through-Hole DO-41 / DO-204AL Direct Substitutes:

The following parts provide direct mechanical and electrical compatibility with the SR004 A0G in through-hole applications:

1N5819-E3/54 (Vishay): Identical 40 V / 1 A rating, DO-204AL package, ROHS3 compliant, 38,300 units in stock
1N5819-E3/73 (Vishay): Identical 40 V / 1 A rating, DO-204AL package, ROHS3 compliant, 20,784 units in stock
1N5819-T (Diodes Incorporated): 40 V / 1 A rating, DO-41 package, ROHS3 compliant, 75,300 units in stock
1N5819-TP (Micro Commercial Co): 40 V / 1 A rating, DO-41 package, ROHS3 compliant, 2,099 units in stock
1N5819-G (Comchip Technology): 40 V / 1 A rating, DO-41 package, ROHS3 compliant, 9,320 units in stock
1N5819RL (STMicroelectronics): 40 V / 1 A rating, DO-41 package, ROHS3 compliant, 5,789 units in stock

All listed through-hole substitutes exceed the SR004 A0G current rating (1 A vs. 500 mA) while maintaining identical voltage specifications and fast recovery Schottky technology. These parts are suitable for direct PCB replacement without layout modification.

Higher Voltage Alternative:

1N5819 (Microchip Technology): 45 V / 1 A rating, DO-41 package, 30,400 units in stock. This part provides increased voltage margin (45 V vs. 40 V) and is applicable in circuits where higher reverse voltage tolerance is beneficial.

Surface-Mount Alternatives:

1N5819HW-7-F (Diodes Incorporated): 40 V / 1 A rating, SOD-123 surface-mount package, ROHS3 compliant, 360,200 units in stock. This variant requires PCB redesign for surface-mount implementation.
MBRA340T3G (onsemi): 40 V / 3 A rating, SMA surface-mount package, ROHS3 compliant, 20,300 units in stock. This higher-current variant is applicable for designs requiring increased current capacity.

All substitute parts maintain ROHS3 compliance and REACH unaffected status consistent with the SR004 A0G.

Frequently Asked Questions (FAQ)

Q: Can 1N5819-E3/54 replace SR004 A0G in a through-hole application?

A: Yes. Both parts share identical 40 V reverse voltage and DO-204AL package specifications. The 1N5819-E3/54 is rated for 1 A average rectified current, exceeding the SR004 A0G 500 mA specification. Electrical performance is compatible for circuits designed for the SR004 A0G.

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

A: Both parts are manufactured by Vishay with identical electrical specifications (40 V, 1 A, DO-204AL package). The suffix designations (-E3/54 and -E3/73) indicate different manufacturing date codes or tape reel configurations. Electrical performance is equivalent.

Q: Is 1N5819HW-7-F a direct replacement for SR004 A0G?

A: 1N5819HW-7-F is a functional electrical equivalent with identical 40 V / 1 A ratings and Schottky technology. However, it uses SOD-123 surface-mount packaging instead of through-hole DO-41. Direct PCB replacement is not possible without circuit board redesign.

Q: Why does 1N5819-E3/53 show higher forward voltage (900 mV @ 3.1 A) than other 1N5819 variants?

A: Forward voltage specifications are measured at different current levels. The 1N5819-E3/53 specification is measured at 3.1 A, while other variants are measured at 1 A. Forward voltage increases with current in Schottky diodes. At equivalent current levels, forward voltage performance is comparable across 1N5819 variants.

Q: Can MBRA340T3G replace SR004 A0G?

A: MBRA340T3G is electrically compatible (40 V, Schottky technology, fast recovery) but rated for 3 A average rectified current, exceeding SR004 A0G requirements. It uses SMA surface-mount packaging, requiring PCB redesign. This part is suitable for applications requiring higher current capacity in surface-mount form factor.

Q: Are all substitute parts ROHS3 compliant?

A: All listed through-hole substitutes (1N5819 variants, 1N5819RL) and surface-mount alternatives (1N5819HW-7-F, MBRA340T3G) are ROHS3 compliant. Compliance status is consistent with the SR004 A0G.

Q: What is the operating temperature range difference between SR004 A0G and substitute parts?

A: SR004 A0G operates from -55°C to 125°C. Most 1N5819 variants operate from -65°C to 125°C, providing lower temperature margin. Comchip 1N5819-G and onsemi MBRA340T3G extend upper temperature to 150°C. Temperature range selection depends on application requirements.

Q: Can I use 1N5819 (45 V) instead of SR004 A0G (40 V)?

A: Yes. The 1N5819 with 45 V reverse voltage rating exceeds the SR004 A0G 40 V specification. Higher voltage rating provides additional safety margin in reverse bias conditions. This substitution is suitable for circuits designed for 40 V operation.

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