FR303G Equivalent & Substitute Parts

Part Overview

The FR303G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 200 V DC reverse voltage and 3 A average rectified current. The device is packaged in a DO-201AD axial through-hole configuration and is classified as a fast recovery diode with a reverse recovery time of 150 ns. This component is actively produced and maintains full RoHS3 compliance with unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate specific application requirements where alternative electrical or mechanical characteristics are acceptable within system design parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the FR303G are identified based on electrical and mechanical parameter equivalence. The primary substitution criteria are:

Electrical Equivalence Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-201AD, Axial configuration
Mounting Type: Through Hole
Operating Temperature Range: -55°C to 150°C minimum

Compliance Parameters:

RoHS3 Compliance status
REACH Status: REACH Unaffected
Moisture Sensitivity Level (MSL): 1 (Unlimited)

The BY251P-E3/54 manufactured by Vishay General Semiconductor - Diodes Division meets all mandatory electrical and mechanical requirements for direct substitution. Both devices share identical voltage ratings, current ratings, package configuration, and thermal operating range. Compliance certifications are equivalent across both parts.

Parameter Comparison

Parameter	FR303G (Taiwan Semiconductor)	BY251P-E3/54 (Vishay)	Unit
Voltage - DC Reverse (Vr) (Max)	200	200	V
Current - Average Rectified (Io)	3	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.1 V @ 3 A	V
Reverse Recovery Time (trr)	150	3000	ns
Current - Reverse Leakage @ Vr	5	5	µA @ 200 V
Capacitance @ Vr, F	30	40	pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	DO-201AD, Axial	—
Mounting Type	Through Hole	Through Hole	—
Operating Temperature - Junction	-55 to 150	-55 to 150	°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Technology	Standard	Standard	—

Engineering Selection Recommendations

FR303G Selection Criteria: The FR303G is selected for applications requiring fast recovery characteristics with a reverse recovery time of 150 ns. This device is suitable for high-frequency switching applications and power supply circuits where switching speed is a critical design parameter. The part maintains active production status with 698 units in current inventory.

BY251P-E3/54 Selection Criteria: The BY251P-E3/54 is selected for applications where standard recovery speed is acceptable and forward voltage drop optimization is prioritized. The lower forward voltage (1.1 V versus 1.3 V at 3 A) reduces power dissipation in linear rectification circuits. This device is actively produced with significantly higher inventory availability (6079 units). Both parts maintain identical RoHS3 compliance and REACH unaffected status.

Substitution Compatibility: Both devices are mechanically and electrically compatible for through-hole PCB mounting in DO-201AD axial package configuration. Selection between these parts depends on application-specific requirements regarding recovery speed and forward voltage characteristics. Both parts operate across the full -55°C to 150°C junction temperature range and maintain equivalent reverse leakage current specifications.

Frequently Asked Questions (FAQ)

Q: Can the BY251P-E3/54 directly replace the FR303G in all applications?

A: The BY251P-E3/54 provides direct mechanical and electrical compatibility for voltage and current ratings. However, the reverse recovery time differs significantly (3000 ns versus 150 ns). Applications sensitive to switching speed, such as high-frequency power supplies or fast switching circuits, require evaluation of this parameter difference before substitution.

Q: What is the primary electrical difference between these two diodes?

A: The FR303G is classified as a fast recovery diode with 150 ns reverse recovery time, while the BY251P-E3/54 is a standard recovery diode with 3000 ns reverse recovery time. The BY251P-E3/54 exhibits lower forward voltage drop (1.1 V versus 1.3 V at 3 A). Both devices maintain identical 200 V reverse voltage and 3 A current ratings.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the FR303G and BY251P-E3/54 are RoHS3 compliant with REACH unaffected status and unlimited moisture sensitivity rating (MSL 1).

Q: What is the package configuration for both parts?

A: Both devices use the DO-201AD axial through-hole package. This configuration is identical for both parts, ensuring mechanical compatibility on PCB layouts designed for either component.

Q: Which part should be selected for low-power dissipation applications?

A: The BY251P-E3/54 exhibits lower forward voltage drop (1.1 V versus 1.3 V at 3 A), resulting in reduced power dissipation during forward conduction. This characteristic makes the BY251P-E3/54 preferable for applications where thermal management and efficiency are primary concerns.

Q: Are there inventory considerations for part selection?

A: The BY251P-E3/54 maintains significantly higher inventory availability (6079 units) compared to the FR303G (698 units). Supply chain continuity may favor the BY251P-E3/54 for high-volume production requirements.

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