SF12G A0G Equivalent & Substitute Parts

Part Overview

The SF12G A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100 V DC reverse voltage and 1 A average rectified current in a DO-204AL (DO-41) through-hole axial package. This component is classified as a standard recovery diode with a reverse recovery time of 35 ns, positioning it in the fast recovery category. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility across multiple manufacturers is required while maintaining electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ 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
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SF12G A0G is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) Maximum: 100 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial configuration
RoHS3 Compliance: Required
Reverse Leakage Current @ Vr: 5 µA @ 100 V (maximum)

Allowable Variation Ranges:

Voltage - Forward (Vf) @ 1 A: 950 mV to 1.1 V (substitute parts may exhibit higher forward voltage drop within this range)
Reverse Recovery Time (trr): 35 ns to 2 µs (substitute parts may have longer recovery times; fast recovery is not required for all applications)
Capacitance @ Vr, F: 8 pF to 20 pF @ 4V, 1MHz (minor variations acceptable)
Operating Temperature - Junction: -55°C to 175°C (substitute parts may support extended temperature ranges)

All substitute parts listed maintain the core electrical specifications of 100 V / 1 A rating with compatible through-hole axial packaging. Variations in forward voltage, recovery time, and temperature range reflect different manufacturing technologies and design approaches within the standard rectifier diode category.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (mV)	trr (ns)	Ir @ Vr (µA)	C @ Vr (pF)	Tj (°C)	Product Status
SF12G A0G	Taiwan Semiconductor Corporation	100	1	950	35	5	20	-55 to 150	Active
1N4002-T	Diodes Incorporated	100	1	1000	>500	5	15	-65 to 150	Last Time Buy
1N4002-E3/54	Vishay General Semiconductor - Diodes Division	100	1	1100	>500	5	15	-55 to 150	Active
1N4002-E3/73	Vishay General Semiconductor - Diodes Division	100	1	1100	>500	5	15	-55 to 150	Active
1N4002-G	Comchip Technology	100	1	1100	>500	5	15	-55 to 150	Active
1N4002E-E3/73	Vishay General Semiconductor - Diodes Division	100	1	1100	>500	5	15	-55 to 150	Active
1N4002G	Taiwan Semiconductor Corporation	100	1	1000	>500	5	10	-55 to 150	Active
1N4002GP-E3/54	Vishay General Semiconductor - Diodes Division	100	1	1100	>500	5	8	-65 to 175	Active
1N4002GPE-E3/54	Vishay General Semiconductor - Diodes Division	100	1	1100	>500	5	8	-65 to 175	Active
1N4002GPE-E3/73	Vishay General Semiconductor - Diodes Division	100	1	1100	>500	5	8	-65 to 175	Active
1N4002RLG	onsemi	100	1	1100	>500	10	-	-65 to 175	Not For New Designs

Engineering Selection Recommendations

Active Production Parts (Preferred for New Designs):

The following substitute parts are in active production status and are suitable for new design implementations:

1N4002-E3/54 (Vishay): Active status, standard recovery characteristics, operating range -55°C to 150°C matching the SF12G A0G junction temperature limits
1N4002-E3/73 (Vishay): Active status, identical electrical specifications to 1N4002-E3/54
1N4002-G (Comchip Technology): Active status, standard recovery, -55°C to 150°C operating range
1N4002E-E3/73 (Vishay): Active status, standard recovery characteristics
1N4002G (Taiwan Semiconductor Corporation): Active status, same manufacturer as primary part, -55°C to 150°C operating range
1N4002GP-E3/54 (Vishay SUPERECTIFIER® series): Active status, extended temperature range -65°C to 175°C, lower capacitance (8 pF)
1N4002GPE-E3/54 (Vishay SUPERECTIFIER® series): Active status, extended temperature range -65°C to 175°C, lower capacitance (8 pF)
1N4002GPE-E3/73 (Vishay SUPERECTIFIER® series): Active status, extended temperature range -65°C to 175°C, lower capacitance (8 pF)

Last Time Buy / Not For New Designs:

1N4002-T (Diodes Incorporated): Last Time Buy status; suitable only for replacement or maintenance of existing designs
1N4002RLG (onsemi): Not For New Designs status; suitable only for replacement or maintenance of existing designs

All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, consistent with the primary SF12G A0G component.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SF12G A0G with any of the listed 1N4002 variants?

A: Yes, all listed 1N4002 variants meet the core electrical requirements of 100 V reverse voltage and 1 A average rectified current. However, parts marked "Last Time Buy" or "Not For New Designs" should be used only for replacement applications, not new designs.

Q: What is the difference between standard recovery and fast recovery diodes in this list?

A: The SF12G A0G features fast recovery with a reverse recovery time (trr) of 35 ns. Most substitute parts listed have standard recovery characteristics with trr >500 ns. Fast recovery is beneficial in high-frequency switching applications; standard recovery is acceptable for general-purpose rectification at lower frequencies.

Q: Are the Vishay SUPERECTIFIER® parts (1N4002GP-E3/54, 1N4002GPE-E3/54, 1N4002GPE-E3/73) direct replacements?

A: These parts are electrically compatible substitutes with identical voltage and current ratings. They feature lower capacitance (8 pF versus 20 pF) and extended operating temperature range (-65°C to 175°C versus -55°C to 150°C). They are suitable for applications requiring lower capacitance or wider temperature operation.

Q: Does forward voltage variation affect circuit performance?

A: The SF12G A0G has a maximum forward voltage of 950 mV at 1 A, while most substitute parts specify 1000 to 1100 mV. This 50 to 150 mV difference is within typical design margins for general-purpose rectification. Applications with tight voltage regulation requirements should account for this variation.

Q: Can I use 1N4002RLG as a replacement?

A: The 1N4002RLG is electrically compatible but carries a "Not For New Designs" status from onsemi. It is suitable for replacement in existing equipment but should not be selected for new circuit designs.

Q: What packaging options are available for these substitute parts?

A: All substitute parts are available in DO-204AL (DO-41) through-hole axial configuration, matching the SF12G A0G package. Packaging variations (Cut Tape, Tape & Reel) affect supply and handling but do not change electrical compatibility.

Q: Is reverse leakage current a critical parameter for substitution?

A: Reverse leakage current is specified at 5 µA @ 100 V for the SF12G A0G and most substitutes. The 1N4002RLG specifies 10 µA @ 100 V, which is acceptable for general-purpose applications but represents a twofold increase. Applications sensitive to leakage current should avoid this part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are RoHS3 compliant and REACH unaffected, matching the environmental compliance status of the SF12G A0G.

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