SF12G-AP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF12G-AP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 100V DC reverse voltage and 1A average rectified current in a through-hole DO-41 package. This diode is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Organizations using this component in active applications require equivalent alternatives that maintain electrical and mechanical compatibility while offering current product status and 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
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Capacitance @ Vr, F	20	pF @ 4V, 1MHz
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF12G-AP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 100V minimum
Current - Average Rectified (Io): 1A minimum
Package / Case: DO-204AL or DO-41 (axial through-hole)
Mounting Type: Through Hole
Operating Temperature Range: -55°C to 150°C minimum

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: 950 mV to 1000 mV @ 1A
Reverse Recovery Time (trr): ≤ 500ns (Fast Recovery classification)
Current - Reverse Leakage @ Vr: ≤ 10 µA @ 100V
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories: Similar Manufacturer Parts (functionally equivalent with minor parameter variations) and Parametric Equivalents (identical or superior electrical characteristics).

Parameter Comparison

Parameter	SF12G-AP (Main)	UF4002-M3/73	SF12G A0G	SF12GHA0G	UG1B-E3/73
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	1000 mV @ 1 A	950 mV @ 1 A	950 mV @ 1 A	950 mV @ 1 A
Reverse Recovery Time (trr)	35 ns	50 ns	35 ns	35 ns	25 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V	10 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V
Capacitance @ Vr, F	20 pF @ 4V, 1MHz	17 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	Not specified
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55 to 150 °C	-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	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	—	AEC-Q101	—

Engineering Selection Recommendations

For Standard Applications:

The SF12G A0G (Taiwan Semiconductor Corporation) and UG1B-E3/73 (Vishay General Semiconductor) are direct parametric equivalents with active product status. Both maintain identical reverse voltage, forward current, and operating temperature specifications. The SF12G A0G provides exact electrical parameter matching to the SF12G-AP, while the UG1B-E3/73 offers superior reverse recovery time (25 ns versus 35 ns), resulting in lower switching losses in high-frequency applications.

For Automotive Applications:

The SF12GHA0G (Taiwan Semiconductor Corporation) is qualified to AEC-Q101 automotive standards and maintains all electrical parameters identical to the SF12G-AP. This variant is appropriate for automotive-grade circuit designs requiring formal qualification documentation.

For Cost-Optimized Sourcing:

The UF4002-M3/73 (Vishay General Semiconductor) is a functional equivalent with active product status. Forward voltage is specified at 1000 mV (50 mV higher than the main part), and reverse leakage current is 10 µA (double the main part specification). These variations remain within acceptable tolerances for general purpose rectification applications where forward voltage drop and leakage current are not critical design constraints.

Inventory Availability:

UG1B-E3/73 maintains the highest inventory level (1900 pcs), followed by SF12G A0G (1120 pcs) and SF12GHA0G (674 pcs). UF4002-M3/73 provides 857 pcs in stock.

Frequently Asked Questions (FAQ)

Q: Can the UF4002-M3/73 be used as a direct replacement for the SF12G-AP?

A: The UF4002-M3/73 is functionally equivalent within the constraints of general purpose rectification. The forward voltage specification of 1000 mV (versus 950 mV) and reverse leakage current of 10 µA (versus 5 µA) are acceptable for applications where these parameters are not critical design constraints. Verify circuit design margins before substitution.

Q: What is the difference between SF12G A0G and SF12GHA0G?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical parameters. The SF12GHA0G carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring formal qualification documentation. Standard applications may use either part interchangeably.

Q: Why does UG1B-E3/73 have a lower reverse recovery time than the main part?

A: UG1B-E3/73 specifies a reverse recovery time of 25 ns compared to 35 ns for the SF12G-AP. This represents superior switching performance and lower switching losses. The part remains fully compatible with all circuit applications designed for the SF12G-AP.

Q: Are all substitute parts available in the same DO-41 package?

A: All substitute parts are specified for DO-204AL (DO-41) axial through-hole mounting. Physical dimensions and lead spacing are compatible with existing PCB layouts designed for the SF12G-AP.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected. The SF12GHA0G additionally carries AEC-Q101 automotive qualification. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Q: Can these parts be used in new product designs?

A: Yes. All substitute parts carry "Active" product status, indicating they are suitable for new designs. The SF12G-AP is marked "Not For New Designs" and should be replaced with an active equivalent in new product development.

Q: What is the moisture sensitivity level for these diodes?

A: All parts, including the main part and all substitutes, are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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