SF12-AP Equivalent & Substitute Parts

Part Overview

The SF12-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 DO-41 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging formats.

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
Operating Temperature - Junction	-55 to 125	°C
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SF12-AP is determined by the following electrical and mechanical parameters:

Primary Compatibility 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
RoHS Status: ROHS3 Compliant

Secondary Compatibility Considerations:

Operating Temperature - Junction: -55°C minimum, 125°C minimum
Current - Reverse Leakage @ Vr: 5µA @ 100V maximum
Voltage - Forward (Vf) (Max) @ If: Electrical performance parameter

The identified substitute parts meet or exceed the primary electrical ratings and package requirements of the SF12-AP. Variations in forward voltage, recovery time, and maximum junction temperature represent acceptable performance differences within the rectifier diode category.

Parameter Comparison

Parameter	SF12-AP (Main)	1N4002E-E3/54	HER102G A0G
Manufacturer	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	1.1 V @ 1 A	1 V @ 1 A
Reverse Recovery Time (trr)	35 ns	Not specified	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V
Capacitance @ Vr, F	40 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz
Operating Temperature - Junction	-55°C to 125°C	-55°C to 150°C	-55°C to 150°C
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

1N4002E-E3/54 (Vishay General Semiconductor - Diodes Division)

The 1N4002E-E3/54 is an active product with ROHS3 compliance and identical voltage and current ratings to the SF12-AP. This part features an extended operating temperature range (-55°C to 150°C) and is available in tape and reel packaging. The forward voltage specification of 1.1V @ 1A represents a marginal increase over the SF12-AP specification of 950mV @ 1A. This substitute is suitable for applications where standard recovery characteristics are acceptable.

HER102G A0G (Taiwan Semiconductor Corporation)

The HER102G A0G is an active product with ROHS3 compliance, matching the SF12-AP across voltage, current, and thermal specifications. This part maintains fast recovery characteristics (≤500ns, >200mA) consistent with the SF12-AP and features a reverse recovery time of 50ns. The forward voltage specification of 1V @ 1A closely aligns with the SF12-AP. This substitute is suitable for applications requiring fast recovery performance. Availability is significantly higher (13,086 pieces in stock) compared to the 1N4002E-E3/54 (811 pieces).

Both substitutes maintain electrical compatibility with the SF12-AP across all critical parameters and satisfy RoHS3 compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N4002E-E3/54 directly replace the SF12-AP in existing designs?

A: Yes. Both parts share identical voltage (100V) and current (1A) ratings, operate within compatible temperature ranges, and are packaged in DO-41 through-hole format. The 1N4002E-E3/54 features a slightly higher forward voltage (1.1V vs. 950mV @ 1A), which is within acceptable tolerance for general-purpose rectifier applications.

Q: What is the primary difference between the 1N4002E-E3/54 and HER102G A0G?

A: The 1N4002E-E3/54 employs standard recovery characteristics (>500ns), while the HER102G A0G features fast recovery characteristics (≤500ns) with a specified reverse recovery time of 50ns. Both parts meet the SF12-AP electrical specifications. Selection depends on application-specific switching speed requirements.

Q: Are there packaging format differences between these substitutes?

A: The 1N4002E-E3/54 is supplied in tape and reel (TR) format, while the HER102G A0G is supplied in cut tape (CT) format. Both are through-hole DO-41 packages suitable for manual or automated assembly. Packaging selection depends on production volume and assembly equipment compatibility.

Q: Do all substitute parts comply with RoHS3 requirements?

A: Yes. The SF12-AP, 1N4002E-E3/54, and HER102G A0G are all ROHS3 compliant with moisture sensitivity level 1 (unlimited).

Q: What is the impact of the forward voltage difference between the SF12-AP and substitutes?

A: The SF12-AP specifies 950mV @ 1A forward voltage, while the 1N4002E-E3/54 specifies 1.1V and the HER102G A0G specifies 1V. These differences represent normal manufacturing variation within the rectifier diode category and do not affect functional compatibility in standard power supply and protection applications.

Q: Which substitute offers better availability?

A: The HER102G A0G offers significantly higher inventory (13,086 pieces) compared to the 1N4002E-E3/54 (811 pieces), making it the preferred choice for applications requiring immediate availability.

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