SF12G R0G Equivalent & Substitute Parts

Part Overview

The SF12G R0G 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 part is discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for direct circuit substitution.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V
Capacitance @ Vr, F	20 pF @ 4 V, 1 MHz
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Package / Case	DO-204AL, DO-41, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SF12G R0G is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-204AL, DO-41, or Axial equivalent
Mounting Type: Through Hole

Performance Classification: Substitute parts are grouped into two categories based on recovery speed characteristics:

Fast Recovery Equivalents (≤ 500 ns): SF12G R1G, SF12GH, SF12GHR1G — These maintain the fast recovery time specification of the original SF12G R0G and are suitable for applications requiring rapid switching performance.
Standard Recovery Equivalents (> 500 ns): 1N4002-T, 1N4002-E3/54, 1N4002-E3/73, 1N4002-G, 1N4002E-E3/54, 1N4002E-E3/73 — These parts meet the 100 V / 1 A electrical ratings but operate with standard recovery characteristics. Forward voltage specifications vary between manufacturers (1.0 V to 1.1 V @ 1 A) within acceptable tolerance ranges for general-purpose rectification.

Compliance and Qualification:

Standard industrial grade: SF12G, SF12G R1G, 1N4002 series (Vishay, Diodes Incorporated, Comchip)
Automotive grade with AEC-Q101 qualification: SF12GH, SF12GHR1G

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and through-hole axial packaging.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Package	Status
SF12G R0G	Taiwan Semiconductor	100 V	1 A	950 mV @ 1 A	Fast Recovery ≤ 500 ns	35 ns	DO-204AL (DO-41)	Discontinued
SF12G	Taiwan Semiconductor	100 V	1 A	950 mV @ 1 A	Fast Recovery ≤ 500 ns	35 ns	DO-204AL (DO-41)	Active
SF12G R1G	Taiwan Semiconductor	100 V	1 A	950 mV @ 1 A	Fast Recovery ≤ 500 ns	35 ns	DO-204AL (DO-41)	Active
SF12GH	Taiwan Semiconductor	100 V	1 A	950 mV @ 1 A	Fast Recovery ≤ 500 ns	35 ns	DO-204AL (DO-41)	Active
SF12GHR1G	Taiwan Semiconductor	100 V	1 A	950 mV @ 1 A	Fast Recovery ≤ 500 ns	35 ns	DO-204AL (DO-41)	Active
1N4002-T	Diodes Incorporated	100 V	1 A	1 V @ 1 A	Standard Recovery > 500 ns	Not specified	DO-204AL (DO-41)	Last Time Buy
1N4002-E3/54	Vishay General Semiconductor	100 V	1 A	1.1 V @ 1 A	Standard Recovery > 500 ns	Not specified	DO-204AL (DO-41)	Active
1N4002-E3/73	Vishay General Semiconductor	100 V	1 A	1.1 V @ 1 A	Standard Recovery > 500 ns	Not specified	DO-204AL (DO-41)	Active
1N4002-G	Comchip Technology	100 V	1 A	1.1 V @ 1 A	Standard Recovery > 500 ns	Not specified	DO-204AL (DO-41)	Active
1N4002E-E3/54	Vishay General Semiconductor	100 V	1 A	1.1 V @ 1 A	Standard Recovery > 500 ns	Not specified	DO-204AL (DO-41)	Active
1N4002E-E3/73	Vishay General Semiconductor	100 V	1 A	1.1 V @ 1 A	Standard Recovery > 500 ns	Not specified	DO-204AL (DO-41)	Active

Engineering Selection Recommendations

Primary Recommendation — Direct Replacement: SF12G or SF12G R1G (Taiwan Semiconductor Corporation) are the preferred direct replacements for the discontinued SF12G R0G. Both parts are manufactured by the same supplier, maintain identical electrical specifications including fast recovery time (35 ns), forward voltage (950 mV @ 1 A), and package configuration. Both are currently in active production status with substantial inventory availability (687 Pcs and 775 Pcs respectively).

Automotive Applications: For applications requiring automotive-grade components with AEC-Q101 qualification, SF12GH or SF12GHR1G provide equivalent electrical performance with automotive qualification. These parts maintain the same fast recovery characteristics and are suitable for automotive circuit designs.

Alternative Suppliers — Standard Recovery: When fast recovery performance is not a circuit requirement, 1N4002 series diodes from Vishay General Semiconductor (1N4002-E3/54, 1N4002-E3/73, 1N4002E-E3/54, 1N4002E-E3/73) or Comchip Technology (1N4002-G) provide functional equivalence at the 100 V / 1 A rating. These parts operate with standard recovery characteristics (> 500 ns) and exhibit slightly higher forward voltage (1.0 V to 1.1 V @ 1 A). All maintain ROHS3 compliance and through-hole axial packaging. The 1N4002-E3/54 variant offers the highest inventory availability (78,691 Pcs) among alternative suppliers.

Product Status Considerations: The 1N4002-T (Diodes Incorporated) is designated as Last Time Buy, indicating limited future availability. Selection of this part should be avoided for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can SF12G R0G be directly replaced with SF12G or SF12G R1G?

A: Yes. SF12G and SF12G R1G are direct electrical and mechanical equivalents manufactured by Taiwan Semiconductor Corporation. All three parts share identical voltage ratings (100 V), current ratings (1 A), forward voltage specifications (950 mV @ 1 A), recovery time (35 ns), and DO-204AL (DO-41) axial package configuration. SF12G and SF12G R1G are currently in active production.

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

A: Fast recovery diodes (SF12G series, 35 ns reverse recovery time) switch off more rapidly than standard recovery diodes (1N4002 series, > 500 ns). Fast recovery diodes are preferred in high-frequency switching applications, power supplies, and circuits where switching speed affects efficiency. Standard recovery diodes are suitable for low-frequency rectification and general-purpose applications. Both types meet the 100 V / 1 A electrical requirements.

Q: Are 1N4002 series diodes suitable replacements for SF12G R0G?

A: 1N4002 series diodes meet the core electrical specifications (100 V reverse voltage, 1 A average rectified current) and package requirements (DO-204AL/DO-41 axial through-hole). However, they operate with standard recovery characteristics rather than fast recovery. Forward voltage is slightly higher (1.0 V to 1.1 V @ 1 A versus 950 mV @ 1 A). Selection depends on circuit requirements for switching speed and forward voltage drop tolerance.

Q: What does AEC-Q101 qualification mean for SF12GH and SF12GHR1G?

A: AEC-Q101 is an automotive electronics qualification standard. SF12GH and SF12GHR1G are qualified for automotive applications and undergo additional testing for reliability, temperature cycling, and environmental stress. These parts are suitable for automotive circuit designs where component qualification is required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (SF12G series and 1N4002 series) are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture handling requirements during storage or assembly.

Q: What packaging options are available for these diodes?

A: All substitute parts are available in DO-204AL (DO-41) axial through-hole package configuration. Some variants are supplied in different packaging formats (Cut Tape, Tape & Reel) for different manufacturing processes, but the component package remains consistent across all listed alternatives.

Q: Which substitute part has the highest inventory availability?

A: 1N4002-E3/54 (Vishay General Semiconductor) has the highest inventory availability at 78,691 Pcs. This part is suitable for applications where standard recovery performance is acceptable and high volume availability is required.

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