ER304-TP Equivalent & Substitute Parts

Part Overview

The ER304-TP 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 component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter 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°C ~ 150°C	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the ER304-TP are classified based on electrical parameter alignment and product status. The primary substitution criteria are:

Critical Parameters for Substitution:

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

Direct Manufacturer Equivalent (SF36G-TP): Manufactured by Micro Commercial Co with identical electrical ratings and active product status. Differs in packaging format (Tape & Reel vs. bulk) and minor forward voltage specification (1.27 V vs. 1.25 V at 3 A).

Similar Manufacturer Part (1N5404-E3/73): Manufactured by Vishay General Semiconductor - Diodes Division. Meets all critical electrical parameters with identical reverse voltage and current ratings. Differs in recovery speed classification (Standard Recovery vs. Fast Recovery) and forward voltage (1.2 V at 3 A).

Parametric Equivalent (ER304_R2_00001): Manufactured by Panjit International Inc. Maintains identical electrical specifications to the main part, including fast recovery characteristics and forward voltage. Active product status with Tape & Reel packaging.

Parameter Comparison

Parameter	ER304-TP	SF36G-TP	1N5404-E3/73	ER304_R2_00001
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	Panjit International Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 3 A	1.27 V @ 3 A	1.2 V @ 3 A	1.25 V @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery > 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	35 ns	35 ns	Not specified	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	1 µA @ 400 V
Capacitance @ Vr, F	35 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	35 pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)

Engineering Selection Recommendations

SF36G-TP (Direct Manufacturer Equivalent): This part is the primary substitute for ER304-TP applications. Manufactured by the same supplier (Micro Commercial Co) with active product status, it provides identical electrical ratings and mechanical compatibility. The forward voltage specification differs marginally (1.27 V vs. 1.25 V), which remains within acceptable tolerance for general-purpose rectification circuits. Extended operating temperature range (-65°C to 150°C) provides additional thermal margin. Tape & Reel packaging is suitable for automated assembly processes.

1N5404-E3/73 (Similar Manufacturer Part): This Vishay part meets all critical electrical parameters and maintains active product status with high inventory availability (29,092 pcs). The primary distinction is recovery speed classification (Standard Recovery vs. Fast Recovery), which affects switching characteristics in high-frequency applications. Forward voltage is lower (1.2 V at 3 A), resulting in reduced power dissipation. This part is suitable for applications where recovery speed is not a critical design constraint. Cut Tape packaging accommodates manual assembly workflows.

ER304_R2_00001 (Parametric Equivalent): This Panjit part provides the closest electrical match to the original ER304-TP, maintaining identical forward voltage (1.25 V), fast recovery characteristics (35 ns), and operating temperature range (-55°C to 150°C). Reverse leakage current is superior (1 µA vs. 5 µA), indicating lower leakage performance. Active product status and Tape & Reel packaging support production requirements. REACH compliance certification is included.

All three substitute parts maintain ROHS3 compliance and DO-201AD axial through-hole package compatibility, ensuring direct mechanical and electrical substitution within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can SF36G-TP be used as a direct replacement for ER304-TP?

A: Yes. SF36G-TP is manufactured by the same supplier (Micro Commercial Co) and maintains identical voltage (400 V) and current (3 A) ratings in the same DO-201AD package. The forward voltage specification differs by 0.02 V (1.27 V vs. 1.25 V at 3 A), which is within acceptable tolerance for general-purpose rectification. Active product status ensures ongoing availability.

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

A: Recovery speed refers to the reverse recovery time (trr), which is the time required for the diode to transition from forward conduction to reverse blocking. Fast Recovery (≤ 500 ns) is specified for ER304-TP, SF36G-TP, and ER304_R2_00001. The 1N5404-E3/73 is classified as Standard Recovery (> 500 ns). Fast recovery diodes are preferred in switching applications and high-frequency circuits where reduced switching losses are required. Standard recovery diodes are suitable for linear power supplies and lower-frequency applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (SF36G-TP, 1N5404-E3/73, and ER304_R2_00001) are ROHS3 compliant, matching the compliance status of the original ER304-TP.

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

A: SF36G-TP and ER304_R2_00001 are supplied in Tape & Reel (TR) format, suitable for automated pick-and-place assembly. The 1N5404-E3/73 is supplied in Cut Tape (CT) format, accommodating manual assembly and lower-volume applications. All parts are available in the same DO-201AD axial through-hole package.

Q: Which substitute part has the lowest reverse leakage current?

A: ER304_R2_00001 specifies 1 µA reverse leakage at 400 V, compared to 5 µA for ER304-TP, SF36G-TP, and 1N5404-E3/73. Lower reverse leakage reduces standby power consumption in applications with sustained reverse bias conditions.

Q: What is the operating temperature range for each substitute part?

A: ER304-TP and ER304_R2_00001 operate from -55°C to 150°C. SF36G-TP extends the lower limit to -65°C. The 1N5404-E3/73 operates from -50°C to 150°C. Selection depends on the specific thermal environment of the application.

Q: Can these parts be used interchangeably in existing circuit designs?

A: Yes, within the specified electrical parameter envelope. All substitute parts maintain 400 V reverse voltage, 3 A current rating, and DO-201AD through-hole package compatibility. Minor variations in forward voltage (1.2 V to 1.27 V) and recovery speed characteristics should be evaluated against specific circuit requirements, particularly in switching applications where recovery time affects efficiency.

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