SF12G-TP Equivalent & Substitute Parts

Part Overview

The SF12G-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 100 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Organizations using this component in active production or maintenance applications require qualified substitute parts that maintain electrical and mechanical compatibility while offering active product status and continued supply availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF12G-TP is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 950 mV @ 1 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): 35 ns
Current - Reverse Leakage @ Vr: 5 µA @ 100 V

Mechanical Equivalence Criteria:

Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial
Operating Temperature - Junction: -55°C to 150°C

Compliance Equivalence Criteria:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

All substitute parts listed maintain full electrical and mechanical compatibility with the SF12G-TP. Variations in secondary parameters such as capacitance or reverse recovery time within the specified ranges do not affect functional substitution. Parts with automotive qualification (AEC-Q101) represent enhanced-grade alternatives suitable for automotive and high-reliability applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	Inventory [Pcs]
SF12G-TP	Micro Commercial Co	100	1	950 @ 1 A	35	5 @ 100 V	DO-41	Not For New Designs	846
ER101_R2_00001	Panjit International Inc.	100	1	950 @ 1 A	35	1 @ 100 V	DO-41	Active	1127
SF12G	Taiwan Semiconductor Corporation	100	1	950 @ 1 A	35	5 @ 100 V	DO-204AL (DO-41)	Active	687
SF12G R1G	Taiwan Semiconductor Corporation	100	1	950 @ 1 A	35	5 @ 100 V	DO-204AL (DO-41)	Active	775
SF12GH	Taiwan Semiconductor Corporation	100	1	950 @ 1 A	35	5 @ 100 V	DO-204AL (DO-41)	Active	814
SF12GHR1G	Taiwan Semiconductor Corporation	100	1	950 @ 1 A	35	5 @ 100 V	DO-204AL (DO-41)	Active	689
UG1B-E3/54	Vishay General Semiconductor - Diodes Division	100	1	950 @ 1 A	25	5 @ 100 V	DO-204AL (DO-41)	Active	4500
UG1B-M3/54	Vishay General Semiconductor - Diodes Division	100	1	950 @ 1 A	25	5 @ 100 V	DO-204AL (DO-41)	Active	1063

Engineering Selection Recommendations

Standard Commercial Grade Substitutes:

The ER101_R2_00001 (Panjit International Inc.) provides direct electrical equivalence with active product status. This part meets all electrical specifications of the SF12G-TP and carries ROHS3 compliance. The reverse leakage current is lower (1 µA vs. 5 µA), representing improved performance characteristics within acceptable substitution parameters.

The SF12G, SF12G R1G, SF12GH, and SF12GHR1G (Taiwan Semiconductor Corporation) maintain full electrical and mechanical compatibility. The SF12GH and SF12GHR1G variants include automotive-grade qualification (AEC-Q101), suitable for applications requiring enhanced reliability and automotive supply chain compliance.

High-Availability Substitutes:

The UG1B-E3/54 and UG1B-M3/54 (Vishay General Semiconductor - Diodes Division) offer the highest inventory availability (4500 and 1063 units respectively). These parts feature a faster reverse recovery time (25 ns vs. 35 ns), which represents improved switching performance. Both maintain full electrical equivalence across voltage, current, and temperature specifications.

Selection Basis:

For standard commercial applications: ER101_R2_00001 or SF12G series
For automotive or high-reliability applications: SF12GH or SF12GHR1G
For maximum supply availability: UG1B-E3/54 or UG1B-M3/54

All listed substitutes are ROHS3 compliant, REACH unaffected, and rated for -55°C to 150°C junction temperature operation.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SF12G-TP with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain identical electrical ratings (100 V, 1 A, 950 mV forward voltage) and are packaged in DO-41 through-hole format. They are mechanically and electrically interchangeable in circuit applications designed for the SF12G-TP.

Q: What is the difference between SF12G and SF12GH?

A: Both parts are electrically identical. The SF12GH variant includes automotive-grade qualification (AEC-Q101) and is suitable for automotive applications requiring enhanced reliability screening and traceability. Standard commercial applications can use either variant.

Q: Why do UG1B-E3/54 and UG1B-M3/54 have faster reverse recovery time (25 ns vs. 35 ns)?

A: Reverse recovery time is a secondary performance parameter that does not affect substitution compatibility. The faster recovery time of the Vishay parts represents improved switching characteristics and is acceptable for all applications designed for the SF12G-TP specification.

Q: What is the difference between UG1B-E3/54 (Cut Tape) and UG1B-M3/54 (Tape & Reel)?

A: Both parts are electrically identical. The packaging format differs: Cut Tape (CT) is supplied in individual strips, while Tape & Reel (TR) is supplied on continuous reels for automated assembly. Select based on your assembly process requirements.

Q: Is ER101_R2_00001 a suitable substitute if my application is sensitive to reverse leakage current?

A: Yes. The ER101_R2_00001 features lower reverse leakage current (1 µA vs. 5 µA at 100 V), which represents improved performance. This part is fully compatible with applications designed for the SF12G-TP and offers enhanced leakage characteristics.

Q: Can I use automotive-grade parts (SF12GH, SF12GHR1G) in non-automotive applications?

A: Yes. Automotive-grade parts exceed the requirements of standard commercial applications. They can be used in any application designed for the SF12G-TP without restriction.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and are REACH unaffected, meeting current environmental and regulatory requirements.

Q: Which substitute part offers the best supply availability?

A: The UG1B-E3/54 (Vishay) offers the highest inventory availability at 4500 units in stock, followed by UG1B-M3/54 at 1063 units. Both are suitable for high-volume procurement requirements.

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