31DF4 A0G Equivalent & Substitute Parts

Part Overview

The 31DF4 A0G 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 component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching or superior electrical and mechanical specifications within the same package category, enabling direct replacement in circuit applications where the core electrical parameters remain within acceptable design tolerances.

Key Parameters

Parameter	31DF4 A0G Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 3 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	20 µA @ 400 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-40°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 31DF4 A0G are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

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

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Lower or equal values indicate improved performance
Reverse Recovery Time (trr): Fast recovery characteristics (≤ 500 ns) maintain switching performance
Current - Reverse Leakage @ Vr: Lower leakage indicates superior reverse blocking
Operating Temperature Range: Extended ranges provide design margin
RoHS Status: ROHS3 compliance ensures regulatory alignment

Parts meeting or exceeding the primary criteria are classified as direct substitutes. Parts with higher current ratings (4 A) are included as they maintain backward compatibility with 3 A applications. All substitute parts listed maintain the same package footprint and through-hole mounting configuration, ensuring mechanical interchangeability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Reverse Leakage @ Vr	Tj (Operating)	RoHS Status
31DF4 A0G	Taiwan Semiconductor Corporation	400 V	3 A	1.7 V @ 3 A	Fast Recovery ≤ 500 ns	35 ns	20 µA @ 400 V	-40°C ~ 150°C	ROHS3
1N5404-E3/54	Vishay General Semiconductor	400 V	3 A	1.2 V @ 3 A	Standard Recovery > 500 ns	—	5 µA @ 400 V	-50°C ~ 150°C	ROHS3
1N5404-E3/73	Vishay General Semiconductor	400 V	3 A	1.2 V @ 3 A	Standard Recovery > 500 ns	—	5 µA @ 400 V	-50°C ~ 150°C	ROHS3
GP30G-E3/54	Vishay General Semiconductor	400 V	3 A	1.1 V @ 3 A	Standard Recovery > 500 ns	5 µs	5 µA @ 400 V	-65°C ~ 175°C	ROHS3
MUR440-E3/54	Vishay General Semiconductor	400 V	4 A	1.28 V @ 4 A	Fast Recovery ≤ 500 ns	75 ns	10 µA @ 400 V	-65°C ~ 175°C	ROHS3
RGP30G-E3/54	Vishay General Semiconductor	400 V	3 A	1.3 V @ 3 A	Fast Recovery ≤ 500 ns	150 ns	5 µA @ 400 V	-65°C ~ 175°C	ROHS3
RGP30G-E3/73	Vishay General Semiconductor	400 V	3 A	1.3 V @ 3 A	Fast Recovery ≤ 500 ns	150 ns	5 µA @ 400 V	-65°C ~ 175°C	ROHS3
STTH3R04RL	STMicroelectronics	400 V	3 A	1.5 V @ 3 A	Fast Recovery ≤ 500 ns	35 ns	5 µA @ 400 V	Max 175°C	ROHS3
UF5404-E3/54	Vishay General Semiconductor	400 V	3 A	1.0 V @ 3 A	Fast Recovery ≤ 500 ns	50 ns	10 µA @ 400 V	-55°C ~ 150°C	ROHS3
UF5404-E3/73	Vishay General Semiconductor	400 V	3 A	1.0 V @ 3 A	Fast Recovery ≤ 500 ns	50 ns	10 µA @ 400 V	-55°C ~ 150°C	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original 31DF4 A0G component. Selection among substitutes is determined by application-specific requirements within the following categories:

Direct Electrical Equivalents (3 A, 400 V): The 1N5404-E3/54, 1N5404-E3/73, GP30G-E3/54, RGP30G-E3/54, RGP30G-E3/73, STTH3R04RL, UF5404-E3/54, and UF5404-E3/73 all satisfy the core voltage and current specifications. These parts are mechanically and electrically interchangeable in the DO-201AD package.

Higher Current Rating: The MUR440-E3/54 provides 4 A average rectified current while maintaining 400 V reverse voltage rating. This part is suitable for applications requiring additional current margin beyond the 3 A specification.

Temperature Operating Range: Parts with extended temperature ranges (-65°C minimum or 175°C maximum) include GP30G-E3/54, MUR440-E3/54, RGP30G-E3/54, and RGP30G-E3/73. These are appropriate for applications with demanding thermal environments.

Forward Voltage Characteristics: Parts with lower forward voltage drop (UF5404-E3/54 and UF5404-E3/73 at 1.0 V @ 3 A) reduce power dissipation compared to the original 31DF4 A0G (1.7 V @ 3 A). Parts with higher forward voltage (GP30G-E3/54 at 1.1 V @ 3 A) remain within acceptable substitution parameters.

Recovery Time Performance: Fast recovery parts (STTH3R04RL, MUR440-E3/54, RGP30G-E3/54, RGP30G-E3/73, UF5404-E3/54, UF5404-E3/73) with trr ≤ 150 ns match or exceed the original 35 ns specification. Standard recovery parts (1N5404-E3/54, 1N5404-E3/73, GP30G-E3/54) with trr > 500 ns are suitable for lower-frequency applications.

Frequently Asked Questions (FAQ)

Q: Can the 31DF4 A0G be replaced with any of the listed substitute parts?

A: All listed substitute parts meet the minimum electrical requirements (400 V reverse voltage, 3 A average rectified current) and share the DO-201AD through-hole package. Direct substitution is mechanically and electrically valid. Application-specific performance differences exist in forward voltage drop, reverse recovery time, and operating temperature range.

Q: What is the difference between the 1N5404-E3/54 and 1N5404-E3/73 variants?

A: Both parts are electrically identical with 400 V, 3 A specifications and identical electrical parameters. The suffix designates packaging configuration: /54 indicates Cut Tape (CT) packaging, while /73 indicates Tape & Reel (TR) packaging. Selection depends on procurement and assembly requirements.

Q: Why does the MUR440-E3/54 have a 4 A rating instead of 3 A?

A: The MUR440-E3/54 is rated for 4 A average rectified current while maintaining the same 400 V reverse voltage. This higher current rating provides design margin and is backward compatible with 3 A applications. The part is a valid substitute with enhanced current capacity.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage drop directly impacts power dissipation and heat generation. The 31DF4 A0G exhibits 1.7 V @ 3 A, while UF5404-E3/54 and UF5404-E3/73 exhibit 1.0 V @ 3 A. Lower forward voltage reduces power loss. Higher forward voltage (such as GP30G-E3/54 at 1.1 V @ 3 A) increases dissipation but remains within acceptable substitution parameters for most applications.

Q: What is the significance of reverse recovery time (trr)?

A: Reverse recovery time determines switching speed and affects high-frequency performance. The 31DF4 A0G specifies 35 ns fast recovery. Substitute parts with comparable or faster trr (STTH3R04RL at 35 ns, UF5404-E3/54 at 50 ns) maintain switching characteristics. Standard recovery parts (1N5404-E3/54, GP30G-E3/54) with trr > 500 ns are suitable for lower-frequency rectification applications.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance certification, matching the regulatory status of the original 31DF4 A0G component.

Q: What packaging options are available for substitutes?

A: All substitute parts are supplied in DO-201AD axial through-hole packages with identical mechanical footprints. Packaging variants (Cut Tape vs. Tape & Reel) affect procurement and assembly logistics but do not alter electrical or mechanical compatibility.

Q: Can the 31DF4 A0G be used in applications requiring extended temperature operation?

A: The 31DF4 A0G operates from -40°C to 150°C. For applications requiring extended temperature ranges, substitute parts such as GP30G-E3/54, MUR440-E3/54, RGP30G-E3/54, and RGP30G-E3/73 offer -65°C to 175°C operation, providing additional thermal margin.

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

A: Fast recovery diodes (trr ≤ 500 ns) are optimized for high-frequency switching applications and exhibit lower reverse recovery current. Standard recovery diodes (trr > 500 ns) are suitable for lower-frequency rectification. The 31DF4 A0G is classified as fast recovery; both fast and standard recovery substitutes are listed based on application requirements.

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