SF12G R1G Equivalent & Substitute Parts

Part Overview

The SF12G R1G 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 fast recovery diode with a reverse recovery time of 35 nanoseconds, suitable for standard rectification applications requiring rapid switching characteristics.

The SF12G R1G maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required, or when sourcing from multiple suppliers is needed for supply chain continuity.

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
Operating Temperature - Junction	-55 to 150	°C
Package / Case	DO-204AL, DO-41, Axial	-
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SF12G R1G are qualified based on the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

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

Allowable Parameter Variations:

Voltage - Forward (Vf) Maximum: Substitute parts may range from 950 mV to 1.1 V at 1 A. Higher forward voltage indicates standard recovery characteristics versus fast recovery.
Reverse Recovery Time (trr): Substitute parts may exhibit 2 µs (standard recovery) or 35 ns (fast recovery). Standard recovery diodes are functionally compatible in most rectification applications.
Current - Reverse Leakage: Substitute parts may range from 5 µA to 10 µA at 100 V, representing acceptable leakage variation.
Capacitance @ Vr, F: Substitute parts may range from 8 pF to 20 pF at 4V, 1MHz.
Operating Temperature - Junction: Substitute parts may extend to -65°C minimum or 175°C maximum, providing equal or superior thermal range.

Substitutes are organized by recovery speed classification and manufacturer, with all parts maintaining electrical equivalence within the specified parameter bands.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (mV)	Recovery Speed	trr (ns/µs)	Ir @ 100V (µA)	Tj Range (°C)	Package	Status
SF12G R1G	Taiwan Semiconductor Corporation	100	1	950	Fast Recovery ≤500ns	35	5	-55 to 150	DO-204AL (DO-41)	Active
1N4002-T	Diodes Incorporated	100	1	1000	Standard Recovery >500ns	-	5	-65 to 150	DO-41	Last Time Buy
1N4002-E3/54	Vishay General Semiconductor - Diodes Division	100	1	1100	Standard Recovery >500ns	-	5	-55 to 150	DO-204AL (DO-41)	Active
1N4002-E3/73	Vishay General Semiconductor - Diodes Division	100	1	1100	Standard Recovery >500ns	-	5	-55 to 150	DO-204AL (DO-41)	Active
1N4002-G	Comchip Technology	100	1	1100	Standard Recovery >500ns	-	5	-55 to 150	DO-41	Active
1N4002E-E3/73	Vishay General Semiconductor - Diodes Division	100	1	1100	Standard Recovery >500ns	-	5	-55 to 150	DO-204AL (DO-41)	Active
1N4002G	Taiwan Semiconductor Corporation	100	1	1000	Standard Recovery >500ns	-	5	-55 to 150	DO-204AL (DO-41)	Active
1N4002GP-E3/54	Vishay General Semiconductor - Diodes Division	100	1	1100	Standard Recovery >500ns	2000	5	-65 to 175	DO-204AL (DO-41)	Active
1N4002GPE-E3/54	Vishay General Semiconductor - Diodes Division	100	1	1100	Standard Recovery >500ns	2000	5	-65 to 175	DO-204AL (DO-41)	Active
1N4002GPE-E3/73	Vishay General Semiconductor - Diodes Division	100	1	1100	Standard Recovery >500ns	2000	5	-65 to 175	DO-204AL (DO-41)	Active
1N4002RLG	onsemi	100	1	1100	Standard Recovery >500ns	-	10	-65 to 175	Axial	Not For New Designs

Engineering Selection Recommendations

Active Status Parts (Recommended for New Designs):

The following substitute parts maintain Active product status and are suitable for new design implementations:

1N4002-E3/54 (Vishay): Active status, DO-204AL package, standard recovery characteristics, operating range -55°C to 150°C
1N4002-E3/73 (Vishay): Active status, DO-204AL package, standard recovery characteristics, operating range -55°C to 150°C
1N4002-G (Comchip Technology): Active status, DO-41 package, standard recovery characteristics, operating range -55°C to 150°C
1N4002E-E3/73 (Vishay): Active status, DO-204AL package, standard recovery characteristics, operating range -55°C to 150°C
1N4002G (Taiwan Semiconductor Corporation): Active status, DO-204AL package, standard recovery characteristics, operating range -55°C to 150°C
1N4002GP-E3/54 (Vishay SUPERECTIFIER® series): Active status, DO-204AL package, extended temperature range -65°C to 175°C
1N4002GPE-E3/54 (Vishay SUPERECTIFIER® series): Active status, DO-204AL package, extended temperature range -65°C to 175°C
1N4002GPE-E3/73 (Vishay SUPERECTIFIER® series): Active status, DO-204AL package, extended temperature range -65°C to 175°C

Last Time Buy Status (Existing Designs Only):

1N4002-T (Diodes Incorporated): Last Time Buy status, suitable only for existing production or maintenance applications

Obsolete Status (Not Recommended):

1N4002RLG (onsemi): Not For New Designs status, retained for reference only

All recommended substitute parts maintain RoHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the SF12G R1G.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SF12G R1G with a standard recovery diode like the 1N4002-E3/54?

A: Yes. The SF12G R1G is a fast recovery diode with 35 ns reverse recovery time. Standard recovery diodes such as the 1N4002-E3/54 with 2 µs recovery time are electrically compatible for general-purpose rectification applications. The difference in recovery speed does not affect functionality in most DC power supply and rectification circuits. The forward voltage difference (950 mV versus 1100 mV) is within acceptable tolerance for standard applications.

Q: What is the difference between DO-204AL and DO-41 package designations?

A: DO-204AL and DO-41 refer to the same physical package format: a through-hole axial lead diode. These designations are equivalent. The package / case field lists both names interchangeably. All substitute parts listed are compatible with the original SF12G R1G package footprint.

Q: Why do some substitute parts have extended temperature ranges (-65°C to 175°C) compared to the SF12G R1G (-55°C to 150°C)?

A: Extended temperature range parts, such as the 1N4002GP-E3/54 and 1N4002GPE-E3/73, provide superior thermal performance and are suitable for applications requiring operation at lower or higher junction temperatures. These parts are direct substitutes and may be used in place of the SF12G R1G without circuit modification. The extended range represents an enhancement rather than a limitation.

Q: Is the 1N4002RLG a suitable substitute?

A: The 1N4002RLG is electrically compatible but carries a "Not For New Designs" product status from onsemi. This part is retained for existing production support only. For new design implementations, select from the Active status alternatives listed in the Engineering Selection Recommendations section.

Q: What does "SUPERECTIFIER®" designation mean on Vishay parts?

A: SUPERECTIFIER® is a Vishay product series designation indicating optimized rectifier performance characteristics. Parts bearing this designation (1N4002GP-E3/54, 1N4002GPE-E3/54, 1N4002GPE-E3/73) maintain full electrical equivalence to the SF12G R1G while offering extended temperature operating ranges and enhanced reliability features.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the SF12G R1G. No additional compliance verification is required for substitution.

Q: What is the significance of the "-E3/54" and "-E3/73" suffixes on Vishay part numbers?

A: These suffixes indicate packaging and tape configuration variants from Vishay. The "-E3/54" and "-E3/73" designations represent different tape reel specifications for automated assembly. Both variants are electrically identical and functionally interchangeable. Selection between these variants depends on assembly equipment compatibility rather than electrical performance.

Q: Can I use the 1N4002-T as a direct replacement?

A: The 1N4002-T is electrically compatible and maintains the same voltage and current ratings as the SF12G R1G. However, this part carries "Last Time Buy" status, indicating limited future availability. For new designs or long-term production, select from the Active status alternatives. For existing production runs, the 1N4002-T remains a valid option during its availability window.

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