SR103 R1G Schottky Diode 30V 1A Equivalent & Substitute Parts

Part Overview

The SR103 R1G is a through-hole Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 30V DC reverse voltage and 1A average rectified current in a DO-204AL (DO-41) axial package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and thermal operating ranges to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 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 @ 30 V
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 SR103 R1G are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 1 A
Technology: Schottky
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 550 mV @ 1 A (tolerance range acceptable)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA to 1 mA @ 30 V
Operating Temperature - Junction: -55°C to -65°C minimum, 125°C maximum
RoHS Status: ROHS3 Compliant

Parts meeting all primary criteria are classified as direct equivalents. Parts with identical electrical ratings but different packaging formats (e.g., axial vs. DO-41 supplier package) are functionally equivalent with mechanical considerations noted.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Temp Range	Product Status
SR103 R1G	Taiwan Semiconductor Corporation	30 V	1 A	550 mV @ 1 A	500 µA @ 30 V	DO-204AL (DO-41)	-55°C ~ 125°C	Active
SB130-T	Diodes Incorporated	30 V	1 A	500 mV @ 1 A	500 µA @ 30 V	DO-41	-65°C ~ 125°C	Active
1N5818-E3/54	Vishay General Semiconductor - Diodes Division	30 V	1 A	550 mV @ 1 A	1 mA @ 30 V	DO-204AL (DO-41)	-65°C ~ 125°C	Active
1N5818-E3/73	Vishay General Semiconductor - Diodes Division	30 V	1 A	550 mV @ 1 A	1 mA @ 30 V	DO-204AL (DO-41)	-65°C ~ 125°C	Active
1N5818-T	Diodes Incorporated	30 V	1 A	550 mV @ 1 A	1 mA @ 30 V	DO-41	-65°C ~ 125°C	Active
1N5818G	onsemi	30 V	1 A	550 mV @ 1 A	1 mA @ 30 V	Axial	-65°C ~ 125°C	Active
1N5818RLG	onsemi	30 V	1 A	550 mV @ 1 A	1 mA @ 30 V	Axial	-65°C ~ 125°C	Active
SB130-E3/54	Vishay General Semiconductor - Diodes Division	30 V	1 A	480 mV @ 1 A	500 µA @ 30 V	DO-204AL (DO-41)	-65°C ~ 125°C	Active
SB130-E3/73	Vishay General Semiconductor - Diodes Division	30 V	1 A	480 mV @ 1 A	500 µA @ 30 V	DO-204AL (DO-41)	-65°C ~ 125°C	Active
SR203-TP	Micro Commercial Co	30 V	2 A	550 mV @ 2 A	1 mA @ 30 V	DO-41	-50°C ~ 125°C	Not For New Designs

Engineering Selection Recommendations

Direct Equivalents (Active Status, Identical Electrical Ratings):

The following parts provide direct functional equivalence to the SR103 R1G with matching 30V, 1A Schottky diode specifications and Active product status:

1N5818-E3/54 (Vishay): Identical forward voltage (550 mV @ 1 A), DO-204AL package, extended temperature range (-65°C to 125°C), ROHS3 compliant
1N5818-E3/73 (Vishay): Identical forward voltage (550 mV @ 1 A), DO-204AL package, extended temperature range (-65°C to 125°C), ROHS3 compliant
1N5818-T (Diodes Incorporated): Identical forward voltage (550 mV @ 1 A), extended temperature range (-65°C to 125°C), ROHS3 compliant
1N5818G (onsemi): Identical forward voltage (550 mV @ 1 A), axial package format, extended temperature range (-65°C to 125°C), ROHS3 compliant
1N5818RLG (onsemi): Identical forward voltage (550 mV @ 1 A), axial package format, extended temperature range (-65°C to 125°C), ROHS3 compliant

Functional Equivalents (Active Status, Minor Parameter Variations):

SB130-T (Diodes Incorporated): Lower forward voltage (500 mV @ 1 A), DO-41 package, extended temperature range (-65°C to 125°C), ROHS3 compliant. Suitable for applications where reduced forward voltage drop is beneficial.
SB130-E3/54 (Vishay): Lower forward voltage (480 mV @ 1 A), DO-204AL package, extended temperature range (-65°C to 125°C), ROHS3 compliant. Suitable for applications where reduced forward voltage drop is beneficial.
SB130-E3/73 (Vishay): Lower forward voltage (480 mV @ 1 A), DO-204AL package, extended temperature range (-65°C to 125°C), ROHS3 compliant. Suitable for applications where reduced forward voltage drop is beneficial.

Not Recommended for New Designs:

SR203-TP (Micro Commercial Co): Product status is "Not For New Designs." Although electrically compatible with 30V, 2A rating, this part should not be selected for new circuit development.

Compliance Summary:

All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original SR103 R1G component.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SR103 R1G with any 30V Schottky diode?

A: No. Substitution requires matching the 1A average rectified current rating, forward voltage characteristics, and through-hole mounting type. Parts rated for higher current (such as SR203-TP at 2A) have different thermal and electrical characteristics and are not direct equivalents.

Q: What is the difference between DO-204AL and DO-41 package designations?

A: DO-204AL and DO-41 refer to the same physical axial through-hole package format. These designations are equivalent and interchangeable. The supplier device package field indicates the specific format provided by the manufacturer.

Q: Why do some substitute parts have lower forward voltage (480 mV vs. 550 mV)?

A: Forward voltage variation within the Schottky diode family reflects manufacturing differences between suppliers. Lower forward voltage (SB130 series at 480 mV) results in reduced power dissipation and heat generation. Both values are within acceptable operating parameters for 30V, 1A applications. Selection depends on circuit thermal requirements.

Q: Are axial package diodes (1N5818G, 1N5818RLG) compatible with DO-41 PCB footprints?

A: Axial and DO-41 packages are physically identical through-hole formats with the same lead spacing and hole diameter. They are mechanically interchangeable on standard PCB layouts designed for DO-41 components.

Q: What is the significance of reverse leakage current differences (500 µA vs. 1 mA)?

A: Reverse leakage current indicates the small current flowing through the diode when reverse biased. The SR103 R1G specifies 500 µA @ 30V, while many substitutes specify 1 mA @ 30V. Both values are acceptable for standard rectification applications. Higher leakage current may be relevant in precision analog circuits or high-impedance applications.

Q: Can I use SR103 R1G in applications requiring extended temperature range?

A: The SR103 R1G operates from -55°C to 125°C. If your application requires operation below -55°C, substitute parts with -65°C minimum rating (1N5818 series, SB130 series) are available and provide extended low-temperature capability.

Q: Why is SR203-TP listed if it is not recommended for new designs?

A: SR203-TP is included for reference in legacy system maintenance and repair scenarios. For new circuit development, select from the Active status parts listed in the Direct Equivalents or Functional Equivalents sections.

Q: How do I verify compatibility before substituting parts?

A: Confirm that the substitute part matches the SR103 R1G in voltage rating (30V), current rating (1A), technology (Schottky), and mounting type (through-hole). Verify that forward voltage and reverse leakage specifications are acceptable for your specific circuit application. Confirm ROHS3 compliance and product status.

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