SR309 R0G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR309 R0G is a through-hole Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 90 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial package. This component is discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain identical electrical and mechanical specifications for direct circuit substitution.

Substiute Parts

SR309 R0G

Taiwan Semiconductor CorporationIn Stock: 887SR309 R0G Datasheet

Current PartRFQ

SR309

Taiwan Semiconductor CorporationIn Stock: 969SR309 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SR309 R0G is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Voltage - DC Reverse (Vr) (Max): 90 V
• Current - Average Rectified (Io): 3 A
• Voltage - Forward (Vf) (Max) @ If: 850 mV @ 3 A
• Current - Reverse Leakage @ Vr: 100 µA @ 90 V
• Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Mechanical Specifications:

• Package / Case: DO-201AD, Axial
• Mounting Type: Through Hole

Environmental & Compliance:

• Operating Temperature - Junction: -55°C ~ 150°C
• Technology: Schottky

All substitute parts must match these parameters exactly. Deviations in voltage rating, current capacity, forward voltage drop, or package type disqualify a component from direct substitution.

Parameter Comparison

Engineering Selection Recommendations

SR309 (Direct Substitute): The SR309 from Taiwan Semiconductor Corporation is the primary equivalent for the discontinued SR309 R0G. This part maintains identical electrical and mechanical specifications across all critical parameters. The SR309 carries Active product status, ensuring ongoing availability and supply chain continuity. Both variants are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements. The SR309 is suitable for direct pin-for-pin and functional replacement in all applications where the SR309 R0G was originally specified.

31DQ09 (Alternative): The 31DQ09 is listed as a substitute option. Complete electrical and mechanical parameter data for this component is not provided in the available documentation. Verification of parameter equivalence against the SR309 R0G specifications is required before implementation in production applications.

Frequently Asked Questions (FAQ)

Q: Can the SR309 directly replace the SR309 R0G in existing designs? A: Yes. The SR309 maintains identical electrical specifications (90 V, 3 A, 850 mV forward voltage, 100 µA reverse leakage) and mechanical configuration (DO-201AD, through-hole axial package). Direct substitution is supported without circuit modification.

Q: What is the primary reason for substituting the SR309 R0G? A: The SR309 R0G is discontinued at DiGi Electronics. The SR309 variant from the same manufacturer provides equivalent performance with Active product status and confirmed availability.

Q: Are there package compatibility concerns when substituting these diodes? A: No. Both the SR309 R0G and SR309 use the DO-201AD axial through-hole package. Physical dimensions, lead spacing, and mounting characteristics are identical, permitting direct board-level substitution.

Q: Do the substitute parts meet the same compliance standards? A: Yes. Both the SR309 R0G and SR309 are ROHS3 Compliant and REACH Unaffected. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for both variants, indicating no special handling requirements.

Q: What operating temperature range applies to substitute parts? A: The operating temperature range for the SR309 is -55°C to 150°C junction temperature, identical to the SR309 R0G. This range supports applications across industrial, commercial, and consumer temperature environments.

Q: Is the 31DQ09 a confirmed equivalent? A: The 31DQ09 is listed as a substitute option. Complete technical specifications for this component are not provided in the available data. Parameter verification is necessary to confirm equivalence before selection.