FR304G Equivalent & Substitute Parts

Part Overview

The FR304G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This diode operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 and REACH regulations. The part is currently active in production with 1130 units in stock. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements where forward voltage drop, reverse recovery time, or temperature range specifications differ from the primary part.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 3 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	30	pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FR304G is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A (or higher)
Package / Case: DO-201AD, Axial
Mounting Type: Through Hole

Secondary Parameters Affecting Substitution Suitability:

Voltage - Forward (Vf) (Max) @ If: 1.3 V or lower at rated current
Reverse Recovery Time (trr): Lower values indicate improved switching performance
Current - Reverse Leakage @ Vr: Lower values indicate reduced standby current
Operating Temperature - Junction: Extended range supports broader application environments
RoHS and REACH Compliance: Required for regulatory adherence

Parts are grouped into the following categories:

Parametric Equivalents: HER305G, HER305G A0G, SF36G, SF36GH — These parts match all critical electrical and mechanical parameters with identical or superior performance characteristics (lower reverse recovery time, equivalent or lower forward voltage).

Direct Equivalent: FR304G — Identical part number and specifications.

Upgrade Options: RGP30G-E3/73 — Meets all critical parameters with extended operating temperature range (-65°C to 175°C) and SUPERECTIFIER® series designation.

Similar Parts: 1N5404-E3/54, 1N5404-E3/73, GP30G-E3/54, MUR440-E3/54 — Meet voltage and current ratings with variations in forward voltage, recovery characteristics, or current rating.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Tj Range [°C]	Package
FR304G	Taiwan Semiconductor	400	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	5 @ 400V	-55 to 150	DO-201AD
HER305G	Taiwan Semiconductor	400	3	1.3 @ 3A	Fast Recovery ≤ 500ns	50	10 @ 400V	-55 to 150	DO-201AD
HER305G A0G	Taiwan Semiconductor	400	3	1.3 @ 3A	Fast Recovery ≤ 500ns	50	10 @ 400V	-55 to 150	DO-201AD
SF36G	Taiwan Semiconductor	400	3	1.3 @ 3A	Fast Recovery ≤ 500ns	35	5 @ 400V	-55 to 150	DO-201AD
SF36GH	Taiwan Semiconductor	400	3	1.3 @ 3A	Fast Recovery ≤ 500ns	35	5 @ 400V	-55 to 150	DO-201AD
RGP30G-E3/73	Vishay General Semiconductor	400	3	1.3 @ 3A	Fast Recovery ≤ 500ns	150	5 @ 400V	-65 to 175	DO-201AD
1N5404-E3/54	Vishay General Semiconductor	400	3	1.2 @ 3A	Standard Recovery >500ns	—	5 @ 400V	-50 to 150	DO-201AD
1N5404-E3/73	Vishay General Semiconductor	400	3	1.2 @ 3A	Standard Recovery >500ns	—	5 @ 400V	-50 to 150	DO-201AD
GP30G-E3/54	Vishay General Semiconductor	400	3	1.1 @ 3A	Standard Recovery >500ns	5000	5 @ 400V	-65 to 175	DO-201AD
MUR440-E3/54	Vishay General Semiconductor	400	4	1.28 @ 4A	Fast Recovery ≤ 500ns	75	10 @ 400V	-65 to 175	DO-201AD

Engineering Selection Recommendations

Parametric Equivalents (HER305G, HER305G A0G, SF36G, SF36GH): These parts satisfy all critical electrical and mechanical requirements for direct substitution. HER305G and HER305G A0G feature reduced reverse recovery time (50 ns) compared to the FR304G (150 ns), improving switching efficiency in high-frequency applications. SF36G and SF36GH offer the lowest reverse recovery time (35 ns) among Taiwan Semiconductor options. SF36GH carries AEC-Q101 automotive qualification, suitable for automotive-grade applications. All four parts maintain RoHS3 compliance and identical operating temperature range.

Direct Equivalent (FR304G): The FR304G itself remains the primary specification. Use this part number when exact performance matching is required and supply is available.

Upgrade Option (RGP30G-E3/73): The RGP30G-E3/73 from Vishay General Semiconductor provides extended operating temperature range (-65°C to 175°C) compared to the FR304G (-55°C to 150°C). This part is designated as SUPERECTIFIER® series and maintains identical electrical performance. Selection is appropriate for applications requiring enhanced thermal margin or operation in extreme temperature environments. RoHS3 and REACH compliance are maintained.

Similar Parts (1N5404-E3/54, 1N5404-E3/73, GP30G-E3/54, MUR440-E3/54): These parts meet the 400 V / 3 A core requirements but exhibit performance variations:

1N5404-E3/54 and 1N5404-E3/73: Standard recovery diodes with forward voltage of 1.2 V (lower than FR304G at 1.3 V). Recovery speed exceeds 500 ns, making these suitable for low-frequency rectification where switching speed is not critical. 1N5404-E3/73 has higher inventory availability (29,092 units).
GP30G-E3/54: SUPERECTIFIER® series with lowest forward voltage (1.1 V @ 3A) and extended temperature range (-65°C to 175°C). Standard recovery characteristic (5 µs trr) indicates suitability for low-frequency applications. Tape & Reel packaging available.
MUR440-E3/54: Rated for 4 A average rectified current (exceeds 3 A requirement) with fast recovery time (75 ns). Forward voltage is 1.28 V @ 4A. Extended temperature range (-65°C to 175°C) and higher current rating provide design margin for applications with potential current surges or thermal stress.

All similar parts maintain RoHS3 compliance and DO-201AD axial through-hole packaging.

Frequently Asked Questions (FAQ)

Q: Can I substitute the FR304G with HER305G in my application?

A: Yes. The HER305G meets all critical electrical parameters (400 V, 3 A, 1.3 V forward voltage) and uses identical DO-201AD through-hole packaging. The HER305G features improved reverse recovery time (50 ns versus 150 ns), which reduces switching losses in rectification circuits. Both parts operate across -55°C to 150°C and comply with RoHS3 and REACH regulations.

Q: What is the difference between SF36G and SF36GH?

A: Both parts are electrically identical with 400 V rating, 3 A current, 1.3 V forward voltage, and 35 ns reverse recovery time. The SF36GH carries AEC-Q101 automotive qualification and is designated for automotive-grade applications. Select SF36GH when automotive reliability standards are required; otherwise, SF36G is suitable for general industrial use.

Q: Why would I choose MUR440-E3/54 over FR304G?

A: The MUR440-E3/54 is rated for 4 A average rectified current, providing 33% higher current capacity than the 3 A FR304G. This part is appropriate when application requirements exceed 3 A or when design margin for current surges is needed. The MUR440-E3/54 also offers extended operating temperature range (-65°C to 175°C) and faster recovery time (75 ns). Forward voltage is 1.28 V @ 4A, comparable to the FR304G.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts use DO-201AD axial through-hole packaging, ensuring mechanical compatibility with existing PCB layouts and assembly processes. GP30G-E3/54 is available in Tape & Reel (TR) packaging in addition to Cut Tape (CT) format.

Q: What is the advantage of RGP30G-E3/73 over FR304G?

A: The RGP30G-E3/73 extends the operating temperature range to -65°C to 175°C (compared to -55°C to 150°C for FR304G), providing 10°C additional margin at both temperature extremes. Electrical performance is identical. This part is designated SUPERECTIFIER® series and is suitable for applications in high-temperature environments or where thermal stress is a design concern.

Q: Can I use 1N5404-E3/73 as a direct replacement?

A: The 1N5404-E3/73 meets the 400 V and 3 A requirements with lower forward voltage (1.2 V versus 1.3 V). However, it is a standard recovery diode with recovery speed exceeding 500 ns, compared to the FR304G fast recovery characteristic (≤ 500 ns). Use 1N5404-E3/73 in low-frequency rectification circuits where switching speed is not critical. For high-frequency applications, fast recovery diodes (HER305G, SF36G, or FR304G) are preferred.

Q: What does "Fast Recovery ≤ 500ns" mean?

A: This specification indicates the diode switches from conducting to blocking state within 500 nanoseconds or faster. Fast recovery diodes minimize reverse current spikes during switching transitions, reducing electromagnetic interference and switching losses. This characteristic is essential in high-frequency power supplies and switching circuits. Standard recovery diodes (>500 ns) are suitable for line-frequency rectification where switching speed is less critical.

Q: Is the FR304G suitable for automotive applications?

A: The FR304G is not designated with automotive qualification. For automotive-grade applications, select SF36GH (AEC-Q101 qualified) or other Vishay parts with automotive certification such as RGP30G-E3/73 or MUR440-E3/54, which carry extended temperature ratings and automotive-grade reliability standards.

Q: How does reverse recovery time affect circuit performance?

A: Reverse recovery time (trr) is the interval required for a conducting diode to stop conducting when reverse voltage is applied. Shorter trr values reduce reverse current spikes, minimize switching losses, and decrease electromagnetic noise. In high-frequency switching applications, lower trr is advantageous. SF36G and SF36GH offer the lowest trr (35 ns) among available options, followed by MUR440-E3/54 (75 ns) and HER305G (50 ns).

Q: Can I use parts with different forward voltage ratings interchangeably?

A: Forward voltage differences affect power dissipation and thermal performance. The FR304G specifies 1.3 V @ 3A, while alternatives range from 1.1 V (GP30G-E3/54) to 1.3 V (HER305G, SF36G, SF36GH). Lower forward voltage reduces heat generation. In applications with tight thermal budgets or high current density, lower forward voltage parts (GP30G-E3/54 at 1.1 V or 1N5404 series at 1.2 V) may improve efficiency. Verify that circuit design accommodates the voltage difference.

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