ER304-AP Equivalent & Substitute Parts

Part Overview

The ER304-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design and procurement requirements. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating packaging and thermal operating ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.25	V @ 3 A
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 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 ER304-AP are classified into two categories based on electrical parameter alignment:

Direct Equivalents (Identical Electrical Ratings): Parts maintaining 400 V reverse voltage, 3 A average rectified current, and DO-201AD package form factor with active product status.

Functional Substitutes (Higher Current Rating): Parts with 400 V reverse voltage but elevated current ratings (5 A) that operate within the same package and thermal envelope, suitable for applications where current margin is acceptable.

Substitution eligibility is determined by the following parameters:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-201AD, Axial
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Status	Temp Range [°C]
ER304-AP	Micro Commercial Co	400	3	1.25 @ 3A	35	5 @ 400V	DO-201AD	Obsolete	-55 to 150
SF36G-AP	Micro Commercial Co	400	3	1.27 @ 3A	35	5 @ 400V	DO-201AD	Active	-65 to 150
1N5404-E3/73	Vishay General Semiconductor - Diodes Division	400	3	1.2 @ 3A	—	5 @ 400V	DO-201AD	Active	-50 to 150
UG56GHA0G	Taiwan Semiconductor Corporation	400	5	1.55 @ 5A	20	10 @ 400V	DO-201AD	Active	-55 to 175

Engineering Selection Recommendations

SF36G-AP is the primary direct equivalent for ER304-AP replacement. Both components are manufactured by Micro Commercial Co with identical electrical ratings (400 V, 3 A), matching forward voltage characteristics, and equivalent reverse recovery time. SF36G-AP holds active product status and extends the lower operating temperature limit to -65°C, providing enhanced thermal margin. RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) are maintained.

1N5404-E3/73 (Vishay General Semiconductor - Diodes Division) provides an alternative direct equivalent with 400 V and 3 A ratings in DO-201AD package. Forward voltage is 1.2 V at 3 A, representing a 4% reduction compared to ER304-AP. This part is active and RoHS3 compliant. Operating temperature range is -50 to 150°C, which is narrower at the lower bound than ER304-AP. Reverse recovery time specification is not provided for this part.

UG56GHA0G (Taiwan Semiconductor Corporation) functions as a higher-current substitute with 5 A average rectified current at 400 V reverse voltage. This part is AEC-Q101 qualified for automotive applications and extends the upper operating temperature to 175°C. The elevated current rating and reduced reverse recovery time (20 ns) accommodate applications requiring additional current margin. Forward voltage increases to 1.55 V at 5 A due to the higher current specification.

Selection between direct equivalents (SF36G-AP, 1N5404-E3/73) and the higher-current substitute (UG56GHA0G) depends on circuit current requirements and thermal operating conditions. All substitute parts maintain DO-201AD package compatibility and RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SF36G-AP directly replace ER304-AP without circuit modification?

A: Yes. SF36G-AP maintains identical voltage (400 V) and current (3 A) ratings, matching forward voltage characteristics (1.27 V vs. 1.25 V at 3 A), and equivalent reverse recovery time (35 ns). Both components use DO-201AD axial through-hole packaging. The extended lower temperature range (-65°C vs. -55°C) provides additional thermal margin.

Q: What is the difference between 1N5404-E3/73 and ER304-AP?

A: Both parts are rated 400 V and 3 A with DO-201AD packaging. The 1N5404-E3/73 exhibits lower forward voltage (1.2 V at 3 A compared to 1.25 V), reducing power dissipation by approximately 4%. The operating temperature range is -50 to 150°C, which is 5°C narrower at the lower bound. Reverse recovery time is not specified for the 1N5404-E3/73.

Q: When should UG56GHA0G be selected instead of direct equivalents?

A: UG56GHA0G is selected when circuit design requires current margin beyond 3 A or when extended upper operating temperature (175°C vs. 150°C) is necessary. The 5 A rating accommodates higher-current applications while maintaining 400 V reverse voltage. AEC-Q101 automotive qualification is available with this part. Forward voltage increases to 1.55 V at 5 A due to the elevated current specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. ER304-AP, SF36G-AP, 1N5404-E3/73, and UG56GHA0G are all RoHS3 compliant. Moisture sensitivity level (MSL 1 - Unlimited) is consistent across all parts.

Q: What packaging formats are available for these substitute parts?

A: ER304-AP and UG56GHA0G do not specify packaging format. SF36G-AP is supplied in Tape & Box (TB) format. 1N5404-E3/73 is supplied in Cut Tape (CT) format. All parts use DO-201AD axial through-hole package / case configuration.

Q: Do substitute parts maintain the same reverse leakage current specification?

A: ER304-AP, SF36G-AP, and 1N5404-E3/73 all specify 5 µA reverse leakage at 400 V. UG56GHA0G specifies 10 µA at 400 V due to its higher current rating, representing a 2× increase in leakage current.

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