FR303 Equivalent & Substitute Parts

Part Overview

The FR303 is a general-purpose rectifier diode rated for 200 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The FR303 operates across a junction temperature range of -65°C to 150°C and features fast recovery characteristics with a reverse recovery time of 150 ns.

Substiute Parts

FR303

SMC Diode SolutionsIn Stock: 5297FR303 Datasheet

Current PartRFQ

FR303G

Taiwan Semiconductor CorporationIn Stock: 780FR303G Datasheet

DirectRFQ

1N5402G A0G

Taiwan Semiconductor CorporationIn Stock: 9611N5402G A0G Datasheet

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FR303G B0G

Taiwan Semiconductor CorporationIn Stock: 904FR303G B0G Datasheet

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SF34GHB0G

Taiwan Semiconductor CorporationIn Stock: 741SF34GHB0G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FR303 is determined by strict equivalence in the following electrical and mechanical parameters:

• Voltage Rating: Reverse voltage must equal or exceed 200 V
• Current Rating: Average rectified current must equal or exceed 3 A
• Package: DO-201AD axial through-hole package required for mechanical compatibility
• Forward Voltage: Maximum forward voltage at 3 A must not exceed design limits
• Reverse Leakage: Maximum reverse leakage current at rated voltage must not exceed 5 µA
• Temperature Range: Operating junction temperature range must support application requirements

Substitute parts are grouped into two categories:

Direct Equivalent: FR303G maintains identical electrical specifications including forward voltage (1.3 V @ 3 A) and reverse recovery time (150 ns), with active product status and RoHS3 compliance.

Similar Equivalents: Parts meeting all core electrical and mechanical requirements but with variations in secondary parameters such as reverse recovery time, forward voltage, or capacitance. These parts are functionally interchangeable within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

FR303G (Direct Equivalent)

The FR303G from Taiwan Semiconductor Corporation is the primary direct equivalent. It maintains identical electrical specifications to the FR303, including forward voltage of 1.3 V @ 3 A and reverse recovery time of 150 ns. The FR303G carries active product status and RoHS3 compliance, providing long-term availability and regulatory alignment. The operating temperature range is reduced to -55°C to 150°C compared to the FR303's -65°C to 150°C; applications requiring operation below -55°C require evaluation against specific design requirements.

FR303G B0G (Similar Equivalent)

The FR303G B0G maintains identical electrical performance to the FR303G with the same forward voltage and reverse recovery time specifications. This variant is suitable for applications where the FR303G direct equivalent is unavailable. The reduced operating temperature range (-55°C to 150°C) applies equally.

1N5402G A0G (Similar Equivalent)

The 1N5402G A0G meets all core electrical and mechanical requirements with improved forward voltage performance (1 V @ 3 A versus 1.3 V @ 3 A). However, this part features standard recovery characteristics (>500 ns) rather than fast recovery (≤500 ns). Selection of this part is appropriate only for applications where recovery speed is not a critical design parameter. The reduced operating temperature range (-55°C to 150°C) applies.

SF34GHB0G (Automotive Qualified)

The SF34GHB0G is qualified to AEC-Q101 automotive standards and features superior forward voltage performance (950 mV @ 3 A) and faster reverse recovery time (35 ns). This part is suitable for automotive applications and designs where lower forward voltage drop and faster switching are beneficial. The reduced operating temperature range (-55°C to 150°C) applies.

Frequently Asked Questions (FAQ)

Q: Can the FR303G be used as a direct replacement for the FR303?

A: Yes. The FR303G maintains identical electrical specifications including voltage rating (200 V), current rating (3 A), forward voltage (1.3 V @ 3 A), and reverse recovery time (150 ns). Both use the DO-201AD axial through-hole package. The primary difference is product status: FR303G is active while FR303 is obsolete. The operating temperature range is reduced from -65°C to -55°C minimum; verify this change against application requirements.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Recovery speed refers to the reverse recovery time (trr), which is the time required for a diode to stop conducting when reverse bias is applied. Fast recovery diodes (≤500 ns) switch off more quickly than standard recovery diodes (>500 ns). Fast recovery diodes reduce switching losses and are preferred in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification where switching speed is not critical.

Q: Are all substitute parts compatible with the FR303 PCB footprint?

A: Yes. All substitute parts listed use the DO-201AD axial through-hole package, which maintains identical mechanical dimensions and PCB footprint compatibility with the FR303. No PCB modifications are required for mechanical fit.

Q: What does RoHS3 compliance mean?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates that the component meets European Union regulations restricting the use of specific hazardous materials including lead, cadmium, mercury, and certain flame retardants. All active substitute parts listed are RoHS3 compliant. The FR303 does not specify RoHS status.

Q: Can the SF34GHB0G be used in non-automotive applications?

A: Yes. The SF34GHB0G meets all electrical and mechanical requirements for general-purpose rectification. AEC-Q101 automotive qualification indicates additional quality and reliability testing but does not restrict use to automotive applications. The superior forward voltage performance (950 mV @ 3 A) and faster recovery time (35 ns) provide benefits in any application where these characteristics are advantageous.

Q: What is the significance of the operating temperature range difference?

A: The FR303 operates from -65°C to 150°C junction temperature, while all substitute parts operate from -55°C to 150°C. Applications requiring operation below -55°C must retain the FR303 or identify alternative solutions. Most commercial and industrial applications operate within the -55°C to 150°C range, making this difference non-critical for typical use cases.

Q: How does capacitance variation affect diode selection?

A: Diode capacitance affects high-frequency performance and switching characteristics. The FR303 specifies 60 pF @ 4V, 1MHz, while substitutes range from 25 pF to 80 pF. Lower capacitance (1N5402G A0G at 25 pF) reduces switching losses in high-frequency circuits. Higher capacitance (SF34GHB0G at 80 pF) has minimal impact on standard rectification applications. Verify capacitance specifications against circuit design requirements for frequency-sensitive applications.

Q: What does REACH Unaffected status indicate?

A: REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) Unaffected status indicates that the component is not subject to REACH regulatory requirements, typically because it does not contain substances of very high concern (SVHC) listed under REACH. All parts listed carry REACH Unaffected status.