FR3G Equivalent & Substitute Parts Reference

Part Overview

The FR3G is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 400 V DC reverse voltage and 3 A average rectified current in a Surface Mount DO-214AB (SMC) package. This component is classified as obsolete, indicating that SMC Diode Solutions has discontinued production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing manufacturing or repair operations for applications utilizing this diode specification.

Substiute Parts

FR3G

SMC Diode SolutionsIn Stock: 954FR3G Datasheet

Current PartRFQ

RS3G

Taiwan Semiconductor CorporationIn Stock: 1644RS3G Datasheet

DirectRFQ

RS3G-13-F

Diodes IncorporatedIn Stock: 29118RS3G-13-F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FR3G are identified based on strict electrical and mechanical parameter equivalence within the general-purpose rectifier diode category. The substitution logic is based on the following critical parameters:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 400 V
• Current - Average Rectified (Io): 3 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Reverse Recovery Time (trr): 150 ns

Mechanical Parameters (Must Match):

• Package / Case: DO-214AB, SMC
• Mounting Type: Surface Mount

Environmental Parameters (Must Match or Exceed):

• Operating Temperature - Junction: -65°C to 150°C (minimum range)
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parts meeting all these criteria are classified as direct substitutes. Variations in forward voltage (Vf), reverse leakage current, or capacitance do not disqualify substitution when all primary electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

RS3G (Taiwan Semiconductor Corporation) is a direct electrical and mechanical substitute for the FR3G. This part maintains identical voltage, current, and speed specifications with matching DO-214AB SMC packaging. The RS3G is currently in active production status, ensuring long-term supply availability. The operating temperature range of -55°C to 150°C covers the upper portion of the FR3G specification. Reverse leakage current is specified at 10 µA @ 400 V, which is higher than the FR3G specification of 5 µA @ 400 V but remains within acceptable limits for general-purpose rectifier applications. Capacitance data is not provided for the RS3G. This part is RoHS3 compliant and available in Tape & Reel (TR) packaging format.

RS3G-13-F (Diodes Incorporated) is a parametric equivalent substitute for the FR3G with complete electrical specification alignment. This part matches the FR3G across all critical parameters: 400 V reverse voltage, 3 A average rectified current, 1.3 V forward voltage @ 3 A, 150 ns reverse recovery time, and 5 µA reverse leakage current @ 400 V. The operating temperature range of -65°C to 150°C is identical to the FR3G. Capacitance is specified at 50 pF @ 4V, 1MHz, which is slightly lower than the FR3G specification of 60 pF. This part is currently in active production status and is RoHS3 compliant. RS3G-13-F is available in Cut Tape (CT) & Digi-Reel® packaging format with significantly higher inventory availability (29,100 pieces in stock).

Both substitute parts satisfy the electrical and mechanical requirements for direct replacement of the obsolete FR3G. Selection between RS3G and RS3G-13-F should be based on packaging format requirements, inventory availability, and temperature range specifications for the specific application.

Frequently Asked Questions (FAQ)

Q: Can the RS3G or RS3G-13-F be used as direct replacements for the FR3G in existing designs?

A: Yes. Both substitute parts meet the critical electrical specifications (400 V reverse voltage, 3 A average rectified current, 150 ns reverse recovery time) and mechanical requirements (DO-214AB SMC package, Surface Mount) of the FR3G. No circuit redesign is required for substitution.

Q: What is the difference between RS3G and RS3G-13-F?

A: Both parts are electrically equivalent with identical voltage and current ratings. The primary differences are: (1) Manufacturer: RS3G is manufactured by Taiwan Semiconductor Corporation; RS3G-13-F is manufactured by Diodes Incorporated; (2) Packaging format: RS3G is supplied in Tape & Reel (TR); RS3G-13-F is supplied in Cut Tape (CT) & Digi-Reel®; (3) Inventory availability: RS3G-13-F has significantly higher stock levels (29,100 pieces versus 1,580 pieces); (4) Forward voltage specification: RS3G-13-F specifies 1.3 V @ 3 A, matching the FR3G; RS3G does not provide forward voltage data; (5) Capacitance: RS3G-13-F specifies 50 pF @ 4V, 1MHz; RS3G does not provide capacitance data.

Q: Does the operating temperature range difference between RS3G (-55°C to 150°C) and FR3G (-65°C to 150°C) affect substitution?

A: The RS3G operating temperature range is narrower at the lower end by 10°C. If the application requires operation below -55°C, the RS3G is not suitable. The RS3G-13-F maintains the full -65°C to 150°C range and is the appropriate choice for applications requiring the complete temperature specification of the FR3G.

Q: What is the significance of the reverse leakage current difference between FR3G (5 µA @ 400 V) and RS3G (10 µA @ 400 V)?

A: The RS3G reverse leakage current is specified at twice the level of the FR3G. For general-purpose rectifier applications, this difference is typically acceptable. Applications with stringent leakage requirements should use RS3G-13-F, which matches the FR3G specification at 5 µA @ 400 V.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both RS3G and RS3G-13-F are RoHS3 compliant. The FR3G REACH status is listed as REACH Unaffected, and both substitute parts maintain REACH Unaffected status.

Q: What packaging formats are available for each substitute part?

A: RS3G is supplied in Tape & Reel (TR) format. RS3G-13-F is supplied in Cut Tape (CT) & Digi-Reel® format. Selection should be based on assembly equipment compatibility and procurement requirements.

Q: Is the capacitance difference between FR3G (60 pF @ 4V, 1MHz) and RS3G-13-F (50 pF @ 4V, 1MHz) significant?

A: The capacitance difference of 10 pF is minor and does not affect substitution for general-purpose rectifier applications. Applications with specific high-frequency filtering or switching requirements should evaluate the impact of this 17% reduction in capacitance.