SR203 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR203 is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 30V DC reverse voltage and 2A average rectified current in a DO-204AC (DO-15) through-hole axial package. This component is designed for fast-switching rectification applications requiring low forward voltage drop and rapid recovery characteristics. Equivalent and substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate specific packaging or performance requirements in circuit implementations.

Substiute Parts

SR203

Taiwan Semiconductor CorporationIn Stock: 953SR203 Datasheet

Current PartRFQ

SB230

SMC Diode SolutionsIn Stock: 76434SB230 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SR203 with the SB230 is based on electrical parameter equivalence within the Schottky diode category. Both components share identical maximum reverse voltage (30V) and average rectified current (2A) ratings, which are the primary determinants of functional interchangeability in rectification circuits. Both devices exhibit fast recovery characteristics (≤ 500ns at > 200mA) and operate within compatible temperature ranges. The forward voltage drop differs by 50 mV (SR203: 550 mV vs. SB230: 500 mV at 2A), representing acceptable variance for most applications. Both components are RoHS3 compliant and carry identical HTSUS and ECCN classifications. The primary distinction is packaging format: SR203 uses DO-204AC (DO-15) while SB230 uses DO-204AL (DO-41), both axial through-hole configurations with different physical dimensions and lead spacing.

Parameter Comparison

Engineering Selection Recommendations

The SB230 qualifies as a direct electrical substitute for the SR203 based on matched voltage and current ratings, identical fast recovery speed characteristics, and equivalent reverse leakage specifications. Both components maintain ROHS3 compliance and carry identical trade classification codes (ECCN: EAR99, HTSUS: 8541.10.0080), supporting regulatory consistency in design documentation.

Selection between SR203 and SB230 is determined by physical package requirements. The SR203 in DO-204AC (DO-15) format accommodates applications with specific PCB layout constraints or through-hole spacing requirements associated with the DO-15 package. The SB230 in DO-204AL (DO-41) format provides an alternative footprint suitable for designs utilizing DO-41 package specifications.

The SB230 offers an extended operating temperature range (-65°C to 150°C versus -55°C to 125°C), providing thermal margin for applications operating at temperature extremes. The SB230 forward voltage specification (500 mV at 2A) is 50 mV lower than the SR203 (550 mV at 2A), resulting in reduced power dissipation in high-current applications.

Component selection should be based on PCB layout compatibility with the required package format and thermal operating requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can the SB230 replace the SR203 in existing circuit designs?

A: Electrical substitution is valid when the circuit PCB accommodates the DO-41 package format. The SB230 matches all critical electrical parameters: 30V reverse voltage, 2A current rating, fast recovery speed, and reverse leakage characteristics. Physical package dimensions differ between DO-15 and DO-41 formats; PCB hole spacing and lead length must be verified for mechanical compatibility.

Q: What is the significance of the 50 mV forward voltage difference between SR203 and SB230?

A: At 2A forward current, the SR203 exhibits 550 mV maximum forward voltage while the SB230 exhibits 500 mV maximum. This 50 mV difference results in lower power dissipation with the SB230 in high-current applications. For most rectification circuits, this variance is within acceptable design margins and does not affect circuit functionality.

Q: Are both parts compliant with environmental and trade regulations?

A: Both SR203 and SB230 are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. The SR203 is REACH Unaffected; the SB230 is REACH Affected. Regulatory compliance documentation should be verified for specific end-use applications and regional requirements.

Q: What are the package format differences between DO-204AC (DO-15) and DO-204AL (DO-41)?

A: Both are axial through-hole packages with different physical dimensions and lead spacing. DO-15 (SR203) and DO-41 (SB230) formats require different PCB hole patterns and component placement. Package selection is determined by existing PCB design specifications and available board real estate.

Q: Does the extended temperature range of the SB230 affect substitution decisions?

A: The SB230 operating range (-65°C to 150°C) exceeds the SR203 range (-55°C to 125°C). For applications operating within the SR203 temperature limits, both components perform identically. For applications requiring extended temperature operation, the SB230 provides additional thermal margin.

Q: Are there inventory or supply considerations between these parts?

A: The SR203 has 942 pieces in stock (Tape & Reel packaging). The SB230 has 76,401 pieces in stock (Cut Tape packaging). Supply availability and packaging format (TR vs. CT) may influence component selection based on procurement requirements and production volume.