SF61G-TP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF61G-TP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 6 A average rectified current in a DO-201AD axial through-hole package. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Identification of equivalent and substitute parts is necessary for applications requiring continued support, legacy system maintenance, or when the primary part becomes unavailable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	975 mV @ 6 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C

Substitute Part Grouping Explanation

Substitute parts for the SF61G-TP are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 50 V reverse voltage rating, 6 A average rectified current, 975 mV forward voltage drop at 6 A, 35 ns reverse recovery time, and 5 µA reverse leakage current. These parts are direct functional replacements with no derating required. Parametric equivalents differ only in manufacturer, product status, or optional qualifications such as automotive certification.

Functional Substitutes operate within the same voltage class (50 V) but with reduced current rating (3 A versus 6 A). These parts are suitable only for applications where the circuit current demand does not exceed the substitute part's 3 A rating. Functional substitutes exhibit slightly different electrical characteristics including higher forward voltage (1 V @ 3 A) and longer reverse recovery time (50 ns), but maintain fast recovery speed classification and identical package geometry.

Key parameters determining substitution eligibility:

Voltage - DC Reverse (Vr) (Max): 50 V (required for all substitutes)
Package / Case: DO-201AD, Axial (required for all substitutes)
Mounting Type: Through Hole (required for all substitutes)
Current - Average Rectified (Io): 6 A (parametric equivalents only) or ≥ circuit requirement (functional substitutes)

Parameter Comparison

Parameter	SF61G-TP (Main)	SF61G (Parametric Equivalent)	SF61GH (Parametric Equivalent)	HER301G B0G (Functional Substitute)
Manufacturer	Micro Commercial Co	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	6 A	6 A	6 A	3 A
Voltage - Forward (Vf) (Max) @ If	975 mV @ 6 A	975 mV @ 6 A	975 mV @ 6 A	1 V @ 3 A
Reverse Recovery Time (trr)	35 ns	35 ns	35 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V
Capacitance @ Vr, F	120 pF @ 4V, 1MHz	100 pF @ 4V, 1MHz	100 pF @ 4V, 1MHz	60 pF @ 4V, 1MHz
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
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 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Product Status	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Qualification	—	—	AEC-Q101	—

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

SF61G and SF61GH are parametric equivalents to SF61G-TP, maintaining identical electrical performance across all critical specifications. Both parts are manufactured by Taiwan Semiconductor Corporation with Active product status, ensuring continued availability and supply chain stability. SF61G provides a standard industrial-grade equivalent suitable for general applications. SF61GH includes AEC-Q101 automotive qualification and is designated for automotive-grade applications requiring enhanced reliability documentation and traceability.

Selection between SF61G and SF61GH depends on application requirements: SF61G for standard industrial use; SF61GH for automotive or mission-critical applications where AEC-Q101 qualification is specified or required by design standards.

For Current-Limited Applications (Functional Substitute):

HER301G B0G operates at 3 A average rectified current, half the rating of SF61G-TP. This part is suitable only for circuits where the maximum sustained forward current does not exceed 3 A. The higher forward voltage (1 V @ 3 A versus 975 mV @ 6 A) and longer reverse recovery time (50 ns versus 35 ns) must be evaluated for thermal and switching performance impact. HER301G B0G is Active status with ROHS3 compliance.

Compliance and Regulatory Considerations:

All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications as the main part. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can SF61G or SF61GH be used as direct replacements for SF61G-TP without circuit modification?

A: Yes. SF61G and SF61GH are parametric equivalents with identical electrical specifications. No circuit modification, derating, or thermal analysis is required. Both parts are pin-compatible in DO-201AD axial through-hole packages and maintain the same operating temperature range (-55 to 150 °C).

Q: What is the difference between SF61G and SF61GH?

A: SF61G and SF61GH are electrically identical. SF61GH includes AEC-Q101 automotive qualification, providing enhanced reliability documentation and manufacturing traceability required for automotive applications. Select SF61GH for automotive or safety-critical applications; SF61G for standard industrial applications.

Q: Can HER301G B0G replace SF61G-TP in all applications?

A: No. HER301G B0G is rated for 3 A average rectified current, compared to SF61G-TP's 6 A rating. This part is suitable only for applications where circuit current does not exceed 3 A. Exceeding this current rating will cause excessive heat dissipation and potential component failure. Verify circuit current requirements before substitution.

Q: What are the thermal implications of using HER301G B0G instead of SF61G-TP?

A: HER301G B0G exhibits higher forward voltage (1 V @ 3 A versus 975 mV @ 6 A), resulting in approximately 25 mV additional voltage drop per ampere. For a 3 A circuit, this represents 75 mV additional drop, increasing power dissipation by approximately 225 mW. Thermal analysis is required to confirm adequate heat dissipation capability in the application.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use DO-201AD axial through-hole packaging with identical mechanical dimensions and pin configuration. No PCB layout or mechanical assembly modifications are required.

Q: What is the inventory status of substitute parts?

A: SF61G has 977 pieces in stock; SF61GH has 655 pieces in stock; HER301G B0G has 712 pieces in stock. All parts are listed as New Original In Stock.

Q: Do substitute parts require different soldering or assembly procedures?

A: No. All parts use identical DO-201AD axial through-hole packages and are compatible with standard through-hole soldering processes. No assembly procedure changes are required.

Q: What is the reverse recovery time difference between SF61G-TP and HER301G B0G?

A: SF61G-TP has 35 ns reverse recovery time; HER301G B0G has 50 ns. The 15 ns difference may impact switching frequency performance in high-speed rectification circuits. Evaluate switching frequency requirements before substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. SF61G, SF61GH, and HER301G B0G are all ROHS3 compliant with REACH Unaffected status, matching the compliance profile of SF61G-TP.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message