SR104HR1G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR104HR1G is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 1A average rectified current in a through-hole DO-204AL (DO-41) axial package. This component is qualified to AEC-Q101 automotive standards and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters to support component procurement flexibility and supply chain continuity.

Key Parameters

Parameter	SR104HR1G Value
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitute parts for the SR104HR1G are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent (Direct Substitution): Parts that match all critical electrical parameters (40V reverse voltage, 1A current rating, 550mV forward voltage @ 1A, fast recovery speed) and package type (DO-204AL through-hole). These parts differ only in packaging format (cut tape versus bulk) or manufacturer variant designation.

Similar Manufacturer Parts (Functional Equivalents): Parts that maintain the same voltage and current ratings, fast recovery Schottky technology, and compatible through-hole or surface-mount packages, but may exhibit variations in forward voltage characteristics, reverse leakage current, capacitance, or operating temperature range. These parts are functionally equivalent for applications where the SR104HR1G specifications are required, provided the application tolerates the documented parameter variations.

Key Parameters for Substitution Determination:

Voltage - DC Reverse (Vr) (Max): 40V or higher
Current - Average Rectified (Io): 1A minimum
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA
Mounting Type: Through Hole (for direct package compatibility)
Package / Case: DO-204AL, DO-41, or Axial compatible

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Ir @ Vr	Package	Mounting Type	Temp Range
SR104HR1G	Taiwan Semiconductor Corporation	40 V	1 A	550 mV @ 1 A	Fast Recovery ≤ 500ns	500 µA @ 40 V	DO-204AL	Through Hole	-55°C ~ 125°C
SR104 A0G	Taiwan Semiconductor Corporation	40 V	1 A	550 mV @ 1 A	Fast Recovery ≤ 500ns	500 µA @ 40 V	DO-204AL	Through Hole	-55°C ~ 125°C
1N5819	Microchip Technology	45 V	1 A	490 mV @ 1 A	Fast Recovery ≤ 500ns	50 µA @ 45 V	DO-204AL	Through Hole	-65°C ~ 125°C
1N5819-E3/53	Vishay General Semiconductor - Diodes Division	40 V	1 A	900 mV @ 3.1 A	Fast Recovery ≤ 500ns	1 mA @ 40 V	DO-204AL	Through Hole	-65°C ~ 125°C
1N5819-E3/54	Vishay General Semiconductor - Diodes Division	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤ 500ns	1 mA @ 40 V	DO-204AL	Through Hole	-65°C ~ 125°C
1N5819-E3/73	Vishay General Semiconductor - Diodes Division	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤ 500ns	1 mA @ 40 V	DO-204AL	Through Hole	-65°C ~ 125°C
1N5819-G	Comchip Technology	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤ 500ns	1 mA @ 40 V	DO-204AL	Through Hole	-55°C ~ 150°C
1N5819-T	Diodes Incorporated	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤ 500ns	1 mA @ 40 V	DO-204AL	Through Hole	-65°C ~ 125°C
1N5819-TP	Micro Commercial Co	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤ 500ns	1 mA @ 40 V	DO-204AL	Through Hole	-55°C ~ 125°C
1N5819HW-7-F	Diodes Incorporated	40 V	1 A	450 mV @ 1 A	Fast Recovery ≤ 500ns	1 mA @ 40 V	SOD-123	Surface Mount	-65°C ~ 125°C
1N5819RL	STMicroelectronics	40 V	1 A	550 mV @ 1 A	Fast Recovery ≤ 500ns	500 µA @ 40 V	DO-204AL	Through Hole	-55°C ~ 150°C

Engineering Selection Recommendations

Direct Substitution (Parametric Equivalent):

SR104 A0G is a parametric equivalent to SR104HR1G, manufactured by Taiwan Semiconductor Corporation. Both parts share identical electrical specifications (40V, 1A, 550mV forward voltage, 500µA reverse leakage) and package configuration (DO-204AL through-hole). The only difference is packaging format (cut tape versus bulk). This part is ROHS3 compliant and maintains the same operating temperature range (-55°C ~ 125°C). Direct substitution is supported without circuit redesign.

Functional Equivalents (Through-Hole DO-41 Package):

The following parts maintain 40V reverse voltage, 1A current rating, fast recovery Schottky technology, and through-hole DO-204AL/DO-41 package compatibility:

1N5819-E3/54, 1N5819-E3/73, 1N5819-G, 1N5819-T, 1N5819-TP, and 1N5819RL are functionally equivalent. These parts exhibit forward voltage characteristics between 550mV and 600mV at 1A, with reverse leakage current of 1mA at 40V (higher than the SR104HR1G specification of 500µA). All are ROHS3 compliant and support automotive applications. Operating temperature ranges vary between -55°C ~ 125°C and -55°C ~ 150°C. These parts are suitable for applications where the documented parameter variations are acceptable.

1N5819 (Microchip Technology) is rated for 45V reverse voltage, providing additional voltage margin. Forward voltage is 490mV at 1A, and reverse leakage is 50µA at 45V, representing improved performance characteristics. Operating temperature range is -65°C ~ 125°C. This part is suitable for applications requiring enhanced voltage headroom.

Surface-Mount Alternative:

1N5819HW-7-F (Diodes Incorporated) provides equivalent electrical performance in a surface-mount SOD-123 package. This part is rated for 40V, 1A, with 450mV forward voltage at 1A and 1mA reverse leakage. Operating temperature range is -65°C ~ 125°C. This part is applicable only to designs using surface-mount assembly processes.

All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, supporting continued availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SR104 A0G be used as a direct replacement for SR104HR1G?

A: Yes. SR104 A0G is a parametric equivalent manufactured by Taiwan Semiconductor Corporation with identical electrical specifications (40V, 1A, 550mV forward voltage, 500µA reverse leakage) and package type (DO-204AL through-hole). The parts differ only in packaging format (cut tape). No circuit modification is required.

Q: What is the difference between the SR104HR1G and 1N5819-E3/54?

A: Both parts are rated for 40V reverse voltage and 1A current in DO-204AL through-hole packages with fast recovery Schottky technology. The 1N5819-E3/54 exhibits forward voltage of 600mV at 1A (compared to 550mV for SR104HR1G) and reverse leakage of 1mA at 40V (compared to 500µA for SR104HR1G). The 1N5819-E3/54 supports an extended operating temperature range of -65°C ~ 125°C. These differences are acceptable for most applications where the SR104HR1G is specified.

Q: Is 1N5819HW-7-F compatible with SR104HR1G?

A: 1N5819HW-7-F is electrically equivalent but uses a surface-mount SOD-123 package instead of the through-hole DO-204AL package of SR104HR1G. This part is suitable only for designs using surface-mount assembly processes. Through-hole designs cannot use this part without board redesign.

Q: Why does 1N5819 have a higher reverse voltage rating (45V) than SR104HR1G (40V)?

A: 1N5819 is rated for 45V reverse voltage, providing additional voltage margin compared to the 40V rating of SR104HR1G. This higher rating does not prevent substitution; it indicates the part can withstand higher reverse voltage stress. The part is suitable for applications where SR104HR1G is specified, with the benefit of enhanced voltage headroom.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed in this reference are ROHS3 compliant and REACH unaffected, supporting regulatory compliance requirements. Compliance status is maintained across all manufacturers and part variants.

Q: What is the significance of the reverse leakage current difference between SR104HR1G (500µA) and 1N5819-E3/54 (1mA)?

A: Reverse leakage current represents the small current flowing through the diode when reverse biased. The SR104HR1G specifies 500µA at 40V, while 1N5819-E3/54 specifies 1mA at 40V. This difference is acceptable for most applications. Applications with strict leakage requirements should verify compatibility with the specific design constraints.

Q: Can I use 1N5819 (Microchip) in place of SR104HR1G?

A: Yes. 1N5819 is functionally equivalent with 45V reverse voltage rating, 1A current, and through-hole DO-41 package compatibility. Forward voltage is 490mV at 1A (lower than SR104HR1G at 550mV), and reverse leakage is 50µA at 45V (lower than SR104HR1G at 500µA). These characteristics represent improved performance. Operating temperature range is -65°C ~ 125°C. This part is suitable for applications where SR104HR1G is specified.

Q: What packaging formats are available for SR104HR1G equivalents?

A: Equivalent parts are available in the following formats: cut tape (CT), bulk, and digi-reel packaging. SR104 A0G is available in cut tape format. Most 1N5819 variants are available in cut tape format. 1N5819HW-7-F is available in cut tape and digi-reel format. Package format selection depends on procurement and assembly requirements; electrical specifications remain consistent across all formats.

Q: Are there temperature range differences between substitute parts?

A: Yes. SR104HR1G operates from -55°C ~ 125°C. Substitute parts vary: 1N5819 and 1N5819-E3/54 support -65°C ~ 125°C (extended low-temperature range). 1N5819-G and 1N5819-TP support -55°C ~ 150°C (extended high-temperature range). 1N5819RL supports -55°C ~ 150°C. Applications operating within the SR104HR1G temperature range can use any substitute part. Applications requiring extended temperature operation should select parts with appropriate temperature ratings.

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