ER301A-AP Equivalent & Substitute Parts

Part Overview

The ER301A-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 150 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 equivalent and substitute components for ongoing design support and procurement continuity. Active alternatives with matching or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	150 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 150 V
Package / Case	DO-201AD, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Standard
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)

Substitute Part Grouping Explanation

Substitution of the ER301A-AP is determined by the following critical parameters: voltage rating (150 V minimum), current rating (3 A minimum), forward voltage drop (950 mV maximum at rated current), reverse recovery time (35 ns maximum), package type (DO-201AD axial), and mounting configuration (through-hole). Substitute parts are grouped into two categories:

Direct Equivalents: Parts matching all primary electrical specifications (150 V, 3 A) with identical or superior performance characteristics.

Enhanced Substitutes: Parts exceeding the voltage or current rating while maintaining package compatibility and electrical performance within acceptable ranges.

All substitute parts listed maintain DO-201AD axial through-hole packaging, RoHS3 compliance, and fast recovery diode technology specifications.

Parameter Comparison

Parameter	ER301A-AP	SF34G-AP	UG4C-M3/54	SF33G A0G	SF33GHA0G
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	150 V	200 V	150 V	150 V	150 V
Current - Average Rectified (Io)	3 A	3 A	4 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	950 mV @ 3 A	950 mV @ 1 A	950 mV @ 3 A	950 mV @ 3 A
Reverse Recovery Time (trr)	35 ns	35 ns	30 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 150 V	5 µA @ 200 V	5 µA @ 150 V	5 µA @ 150 V	5 µA @ 150 V
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SF34G-AP (Micro Commercial Co): Active product status with enhanced voltage rating (200 V) provides margin above the original 150 V specification. Maintains identical current rating (3 A) and forward voltage characteristics. Extended lower operating temperature limit (-65°C) offers improved thermal performance. RoHS3 compliant. Suitable for direct replacement in applications where higher voltage margin is acceptable.

UG4C-M3/54 (Vishay General Semiconductor): Active product with elevated current rating (4 A) exceeds the original 3 A specification, providing operational headroom. Reverse recovery time (30 ns) is superior to the original 35 ns. Maintains 150 V voltage rating and DO-201AD package compatibility. RoHS3 compliant with REACH unaffected status. Appropriate for applications requiring enhanced current capacity.

SF33G A0G (Taiwan Semiconductor Corporation): Parametric equivalent matching all primary electrical specifications (150 V, 3 A, 950 mV forward voltage, 35 ns recovery time). Active product status with RoHS3 compliance and REACH unaffected designation. Identical operating temperature range. Direct functional replacement for the obsolete ER301A-AP.

SF33GHA0G (Taiwan Semiconductor Corporation): Parametric equivalent with automotive-grade qualification (AEC-Q101) and identical electrical specifications to SF33G A0G. Active product status with RoHS3 compliance and REACH unaffected status. Suitable for applications requiring automotive-qualified components or enhanced reliability assurance.

Frequently Asked Questions (FAQ)

Q: Can SF34G-AP be used as a direct replacement for ER301A-AP?

A: Yes. SF34G-AP maintains the same current rating (3 A) and forward voltage characteristics (950 mV @ 3 A) as the ER301A-AP. The higher voltage rating (200 V vs. 150 V) provides additional design margin and does not create compatibility issues in circuits designed for 150 V operation.

Q: What is the difference between UG4C-M3/54 and the original ER301A-AP?

A: UG4C-M3/54 has a higher current rating (4 A vs. 3 A) and faster reverse recovery time (30 ns vs. 35 ns). The voltage rating remains at 150 V. These differences make it suitable for applications requiring higher current capacity or improved switching performance.

Q: Are SF33G A0G and SF33GHA0G interchangeable?

A: Both parts have identical electrical specifications and package configuration. SF33GHA0G includes automotive-grade qualification (AEC-Q101), making it the preferred choice for automotive applications or systems requiring enhanced reliability documentation.

Q: Does packaging format affect substitution compatibility?

A: All substitute parts use DO-201AD axial through-hole packaging, matching the original ER301A-AP. Packaging format differences (Tape & Box vs. Tape & Reel) affect procurement and handling but do not impact electrical or mechanical compatibility in circuit applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SF34G-AP, UG4C-M3/54, SF33G A0G, and SF33GHA0G) are RoHS3 compliant, matching the compliance status of the original ER301A-AP.

Q: What is the operating temperature range difference between ER301A-AP and SF34G-AP?

A: SF34G-AP has an extended lower temperature limit (-65°C vs. -55°C), providing operation in colder environments. The upper temperature limit remains at 150°C for both parts.

Q: Can these diodes be used in high-frequency switching applications?

A: All listed parts are classified as fast recovery diodes with reverse recovery times between 30 ns and 35 ns, supporting high-frequency switching applications within the specified current and voltage ratings.

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