SR003 B0G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR003 B0G is a 30V, 500mA Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in a through-hole DO-204AL (DO-41) axial package. This component is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and thermal operating ranges. Alternative models become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit higher current ratings within the same voltage class.

Key Parameters

Parameter	SR003 B0G	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	500	mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 500 mA	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 30 V	µA
Capacitance @ Vr, F	110 pF @ 4V, 1MHz	pF
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the SR003 B0G is based on the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 30V minimum
Technology: Schottky rectifier diode
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial compatible
Forward Voltage (Vf): 550 mV or lower at rated current
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
RoHS3 Compliance: Required
REACH Status: Unaffected

Allowable Parameter Variations:

Current - Average Rectified (Io): 500mA or higher (uprating permitted)
Current - Reverse Leakage @ Vr: 500 µA or lower (lower leakage acceptable)
Operating Temperature - Junction: -55°C minimum, 125°C minimum upper limit
Capacitance @ Vr, F: No upper constraint specified

Substitute parts are grouped into two categories: Direct Through-Hole Equivalents (DO-41/DO-204AL axial packages) and Surface Mount Alternative (SMA package for design flexibility). All substitute parts maintain 30V reverse voltage rating and Schottky technology with fast recovery characteristics.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Mounting Type	Tj Range [°C]	RoHS3
SR003 B0G	Taiwan Semiconductor Corporation	30	500	550 @ 500 mA	500 @ 30 V	DO-204AL (DO-41)	Through Hole	-55 ~ 125	Yes
1N5818	Microchip Technology	30	1000	550 @ 1 A	1000 @ 30 V	DO-41	Through Hole	-55 ~ 150	Yes
1N5818-E3/54	Vishay General Semiconductor - Diodes Division	30	1000	550 @ 1 A	1000 @ 30 V	DO-204AL (DO-41)	Through Hole	-65 ~ 125	Yes
1N5818-E3/73	Vishay General Semiconductor - Diodes Division	30	1000	550 @ 1 A	1000 @ 30 V	DO-204AL (DO-41)	Through Hole	-65 ~ 125	Yes
1N5818-T	Diodes Incorporated	30	1000	550 @ 1 A	1000 @ 30 V	DO-41	Through Hole	-65 ~ 125	Yes
1N5818-TP	Micro Commercial Co	30	1000	550 @ 1 A	1000 @ 30 V	DO-41	Through Hole	-55 ~ 125	Yes
1N5818G	onsemi	30	1000	550 @ 1 A	1000 @ 30 V	Axial	Through Hole	-65 ~ 125	Yes
1N5818RLG	onsemi	30	1000	550 @ 1 A	1000 @ 30 V	Axial	Through Hole	-65 ~ 125	Yes
SB130-E3/54	Vishay General Semiconductor - Diodes Division	30	1000	480 @ 1 A	500 @ 30 V	DO-204AL (DO-41)	Through Hole	-65 ~ 125	Yes
SB130-E3/73	Vishay General Semiconductor - Diodes Division	30	1000	480 @ 1 A	500 @ 30 V	DO-204AL (DO-41)	Through Hole	-65 ~ 125	Yes
MBRA130LT3G	onsemi	30	1000	410 @ 1 A	1000 @ 30 V	SMA	Surface Mount	-55 ~ 125	Yes

Engineering Selection Recommendations

Through-Hole DO-41/DO-204AL Axial Equivalents (Direct Pin-Compatible Substitutes):

The 1N5818 series parts (1N5818, 1N5818-E3/54, 1N5818-E3/73, 1N5818-T, 1N5818-TP, 1N5818G, 1N5818RLG) are functionally equivalent to the SR003 B0G with identical 30V reverse voltage rating and fast recovery Schottky characteristics. These parts feature 1A current rating, providing 2× current margin over the 500mA SR003 B0G specification. All variants maintain RoHS3 compliance and REACH unaffected status. Selection among 1N5818 variants depends on packaging preference (DO-41 tape, DO-204AL tape, or axial bulk) and manufacturer availability. The Vishay SB130-E3/54 and SB130-E3/73 parts offer lower forward voltage (480 mV vs. 550 mV) and matching reverse leakage (500 µA), providing improved efficiency in low-voltage applications.

Surface Mount Alternative:

The MBRA130LT3G (onsemi, SMA package) provides equivalent electrical performance with superior forward voltage characteristics (410 mV @ 1A) for designs permitting surface mount technology. This part is suitable for new designs or board revisions requiring compact form factors.

Compliance & Availability:

All listed substitute parts maintain Active product status, RoHS3 compliance, and REACH unaffected designation. Inventory levels range from 2,761 to 68,906 units across suppliers, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the SR003 B0G be replaced with a 1N5818 in existing designs?

A: Yes. The 1N5818 is a direct functional equivalent with identical 30V reverse voltage rating, matching forward voltage (550 mV @ 1A), and compatible DO-41/DO-204AL through-hole packaging. The 1A current rating of the 1N5818 exceeds the 500mA SR003 B0G specification, making it suitable for the same circuit applications without derating.

Q: What is the difference between 1N5818-E3/54 and 1N5818-E3/73?

A: Both parts are manufactured by Vishay with identical electrical specifications (30V, 1A, 550 mV forward voltage). The suffix designations (-E3/54 and -E3/73) indicate different manufacturing date codes or tape reel configurations. Electrical performance and package compatibility are equivalent.

Q: Is the SB130-E3/54 a better choice than the 1N5818?

A: The SB130-E3/54 offers lower forward voltage (480 mV vs. 550 mV @ 1A) and matching reverse leakage (500 µA), resulting in reduced power dissipation and improved efficiency. Selection depends on circuit requirements for forward voltage drop and thermal management constraints. Both parts maintain 30V reverse voltage and fast recovery characteristics.

Q: Can the MBRA130LT3G surface mount part replace the through-hole SR003 B0G?

A: The MBRA130LT3G is electrically equivalent but requires surface mount assembly capability. It is suitable for new designs or board revisions supporting SMA package technology. Existing through-hole designs require mechanical board layout changes to accommodate surface mount footprints.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification and REACH unaffected status, matching the SR003 B0G regulatory requirements.

Q: What is the operating temperature range difference between SR003 B0G and substitute parts?

A: The SR003 B0G operates from -55°C to 125°C. Most substitute parts (1N5818-E3/54, 1N5818-E3/73, 1N5818-T, 1N5818G, 1N5818RLG, SB130-E3/54, SB130-E3/73) extend the lower limit to -65°C. The 1N5818 (Microchip) extends the upper limit to 150°C. These extended ranges provide additional design margin in temperature-sensitive applications.

Q: What packaging options are available for the 1N5818 base part number?

A: The 1N5818 base part is available in three packaging configurations: DO-41 (tape), DO-204AL (tape), and Axial (bulk). All three maintain identical electrical specifications and through-hole mounting compatibility. Selection depends on assembly process requirements and supplier inventory.

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