ER300-TP Equivalent & Substitute Parts

Part Overview

The ER300-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, which necessitates identification of active substitute parts that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	50 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 @ 50 V
Package / Case	DO-201AD, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Standard
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)

Substitute Part Grouping Explanation

Substitute parts for the ER300-TP are selected based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 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 @ 50 V
Package / Case: DO-201AD, Axial
Mounting Type: Through Hole
Operating Temperature - Junction: -55°C ~ 150°C
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

All substitute parts listed maintain these electrical specifications and physical package requirements, ensuring direct functional replacement in circuit applications.

Parameter Comparison

Parameter	ER300-TP (Micro Commercial Co)	SF31G (Taiwan Semiconductor)	SF31GH (Taiwan Semiconductor)
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	950 mV @ 3 A	950 mV @ 3 A
Reverse Recovery Time (trr)	35 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	35 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz	80 pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Grade	Standard	Standard	Automotive
Qualification	—	—	AEC-Q101

Engineering Selection Recommendations

SF31G (Taiwan Semiconductor Corporation): This part is a parametric equivalent to the ER300-TP with active product status. It maintains all critical electrical specifications and is housed in the identical DO-201AD through-hole package. The SF31G carries ROHS3 compliance and unlimited moisture sensitivity rating, matching the original part's environmental qualifications. This substitute is suitable for general-purpose applications requiring direct replacement of the obsolete ER300-TP.

SF31GH (Taiwan Semiconductor Corporation): This part is a parametric equivalent with automotive-grade qualification (AEC-Q101) and active product status. It maintains all critical electrical specifications and package compatibility with the ER300-TP. The SF31GH is designated for automotive applications and carries the same ROHS3 compliance and environmental ratings as the standard SF31G variant. Selection of this part is appropriate for applications requiring automotive-grade component certification.

Both substitute parts are available in active production inventory, ensuring long-term supply continuity compared to the obsolete ER300-TP.

Frequently Asked Questions (FAQ)

Q: Can SF31G and SF31GH be used interchangeably with ER300-TP? A: Yes. Both parts maintain identical electrical specifications (50 V, 3 A, 950 mV forward voltage, 35 ns recovery time) and are packaged in the same DO-201AD axial through-hole configuration. Physical and functional compatibility is confirmed.

Q: What is the difference between SF31G and SF31GH? A: The SF31GH carries automotive-grade qualification (AEC-Q101) and is designated for automotive applications. The SF31G is a standard-grade variant. Both maintain identical electrical performance and package specifications. Selection depends on application requirements and automotive certification needs.

Q: Are there any parameter differences between the ER300-TP and substitute parts? A: The substitute parts SF31G and SF31GH exhibit higher junction capacitance (80 pF versus 35 pF at 4V, 1MHz). All other electrical parameters, including voltage rating, current rating, forward voltage, recovery time, and leakage current, are identical. This capacitance difference does not affect substitution eligibility for standard rectifier applications.

Q: Why is the ER300-TP classified as obsolete? A: The ER300-TP is no longer in active production. The SF31G and SF31GH from Taiwan Semiconductor Corporation are active production alternatives that provide equivalent electrical and mechanical performance.

Q: Are the substitute parts RoHS compliant? A: Yes. Both SF31G and SF31GH are ROHS3 compliant, matching the environmental compliance status of the original ER300-TP.

Q: What is the operating temperature range for these diodes? A: All three parts (ER300-TP, SF31G, and SF31GH) operate across a junction temperature range of -55°C to 150°C.

Q: Can these diodes be used in high-frequency switching applications? A: These are fast recovery diodes with a reverse recovery time of 35 ns and fast recovery classification (≤ 500ns, > 200mA). They are suitable for switching applications within their rated specifications.

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