SF11G A0G Equivalent & Substitute Parts

Part Overview

The SF11G A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 1 A average rectified current in a through-hole DO-204AL (DO-41) 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 SF11G A0G maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified based on matching electrical specifications: 50 V reverse voltage rating, 1 A current capacity, through-hole axial mounting, and compatible package geometry. Alternative sources become necessary for supply chain continuity, inventory optimization, or when the primary manufacturer part reaches end-of-life status.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	50	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 @ 50 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
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SF11G A0G is determined by the following mandatory electrical and mechanical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) Maximum: 50 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial equivalent
Current - Reverse Leakage @ Vr: 5 µA @ 50 V

Secondary Compatibility Factors:

Voltage - Forward (Vf) Maximum @ If: Must not exceed application requirements
Operating Temperature Range: Must encompass application operating conditions
RoHS3 Compliance: Required for regulatory alignment
Moisture Sensitivity Level: 1 (Unlimited) preferred for handling consistency

All substitute parts listed meet the primary matching criteria. Variations in reverse recovery time, forward voltage characteristics, and junction temperature ranges reflect different technology implementations within the same functional class. These variations are acceptable provided the application circuit design accommodates the specific electrical behavior of the selected substitute.

Parameter Comparison

Parameter	SF11G A0G (Main)	1N4001-T	1N4001-E3/53	1N4001-E3/54	1N4001-E3/73	1N4001-G	1N4001E-E3/54	1N4001G	1N4001GP-E3/54	1N4001GP-E3/73	1N4001GPE-E3/54
Manufacturer	Taiwan Semiconductor	Diodes Inc.	Vishay	Vishay	Vishay	Comchip	Vishay	Taiwan Semiconductor	Vishay	Vishay	Vishay
Vr (Max) [V]	50	50	50	50	50	50	50	50	50	50	50
Io [A]	1	1	1	1	1	1	1	1	1	1	1
Vf (Max) @ If [mV]	950 @ 1A	1000 @ 1A	1100 @ 1A	1100 @ 1A	1100 @ 1A	1100 @ 1A	1100 @ 1A	1000 @ 1A	1100 @ 1A	1100 @ 1A	1100 @ 1A
Reverse Recovery Time [ns]	35	—	—	—	—	—	—	—	2000	2000	2000
Ir @ Vr [µA]	5 @ 50V	5 @ 50V	5 @ 50V	5 @ 50V	5 @ 50V	5 @ 50V	5 @ 50V	5 @ 50V	5 @ 50V	5 @ 50V	5 @ 50V
Capacitance @ Vr [pF]	20 @ 4V	15 @ 4V	15 @ 4V	15 @ 4V	15 @ 4V	15 @ 4V	15 @ 4V	10 @ 4V	8 @ 4V	8 @ 4V	8 @ 4V
Tj (Operating) [°C]	-55 to 150	-65 to 150	-50 to 150	-55 to 150	-55 to 150	-55 to 150	-50 to 150	-55 to 150	-65 to 175	-65 to 175	-65 to 175
Package	DO-204AL (DO-41)	DO-41	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-41	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)
Product Status	Active	Last Time Buy	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

Primary Selection (Active Status, Preferred):

The following substitute parts maintain Active product status with full availability and are recommended for new designs and ongoing production:

1N4001-E3/54 (Vishay): Active status, 2370 units in stock, operating range -50°C to 150°C, standard recovery characteristics
1N4001-E3/73 (Vishay): Active status, 1428 units in stock, operating range -55°C to 150°C, standard recovery characteristics
1N4001-G (Comchip): Active status, 56269 units in stock, operating range -55°C to 150°C, highest inventory availability
1N4001G (Taiwan Semiconductor): Active status, 1492 units in stock, same manufacturer as main part, operating range -55°C to 150°C
1N4001E-E3/54 (Vishay): Active status, 20948 units in stock, operating range -50°C to 150°C
1N4001GP-E3/54 (Vishay SUPERECTIFIER®): Active status, 7607 units in stock, extended operating range -65°C to 175°C, lower capacitance (8 pF)
1N4001GP-E3/73 (Vishay SUPERECTIFIER®): Active status, 1145 units in stock, extended operating range -65°C to 175°C, lower capacitance (8 pF)
1N4001GPE-E3/54 (Vishay SUPERECTIFIER®): Active status, 11704 units in stock, extended operating range -65°C to 175°C, lower capacitance (8 pF)

Secondary Selection (Last Time Buy Status):

1N4001-T (Diodes Incorporated): Last Time Buy status, 15400 units in stock, operating range -65°C to 150°C. This part remains available but should be evaluated for long-term supply chain planning.

Compliance Verification:

All listed substitute parts maintain RoHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited), matching the regulatory profile of the SF11G A0G. Selection between Active status parts depends on application-specific requirements for forward voltage characteristics, operating temperature range, and reverse recovery behavior.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SF11G A0G with any 50 V, 1 A diode?

A: No. Substitution requires matching the specific electrical parameters listed in the Key Parameters section, including reverse voltage rating (50 V), average rectified current (1 A), reverse leakage current (5 µA @ 50 V), and through-hole axial package geometry (DO-204AL/DO-41). Additionally, the substitute must maintain RoHS3 compliance and Moisture Sensitivity Level 1.

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

A: The SF11G A0G is classified as a fast recovery diode with a reverse recovery time of 35 nanoseconds. Most substitute parts listed are standard recovery diodes with recovery times exceeding 500 nanoseconds. The SUPERECTIFIER® variants (1N4001GP-E3/54, 1N4001GP-E3/73, 1N4001GPE-E3/54) specify 2 microsecond recovery times. Fast recovery characteristics reduce switching losses in high-frequency applications; standard recovery diodes are suitable for lower-frequency rectification circuits.

Q: Are the Vishay SUPERECTIFIER® parts (1N4001GP series) direct replacements?

A: The SUPERECTIFIER® variants meet all primary matching criteria: 50 V reverse voltage, 1 A current rating, DO-204AL package, and 5 µA reverse leakage. They differ in lower junction capacitance (8 pF versus 20 pF for the main part) and extended operating temperature range (-65°C to 175°C). These characteristics make them suitable substitutes for applications requiring lower capacitance or wider temperature operation.

Q: Why do some substitute parts have higher forward voltage (1.1 V) compared to the SF11G A0G (950 mV)?

A: Forward voltage variation reflects different semiconductor manufacturing processes and doping profiles among manufacturers. The SF11G A0G and 1N4001-T specify 950–1000 mV forward voltage, while most Vishay and Comchip variants specify 1.1 V. This 100–150 mV difference is within standard rectifier tolerance and does not affect circuit functionality in typical applications. Applications with strict power dissipation budgets should account for this variation.

Q: What is the significance of the product status "Last Time Buy" for the 1N4001-T?

A: Last Time Buy status indicates that Diodes Incorporated has announced end-of-life for this part number. While 15400 units remain in stock, no future production is planned. This part is suitable for immediate replacement needs but should not be selected for new designs or long-term production commitments. Active status parts are recommended for ongoing applications.

Q: Can I use the 1N4001-E3/53 if my application requires operation below -50°C?

A: No. The 1N4001-E3/53 specifies an operating junction temperature range of -50°C to 150°C. Applications requiring operation below -50°C should select alternatives with extended lower temperature ratings, such as 1N4001-T (-65°C to 150°C) or the SUPERECTIFIER® variants (-65°C to 175°C).

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are through-hole axial diodes in DO-204AL or DO-41 package designations, which are mechanically and electrically equivalent. Packaging format (Cut Tape versus Tape & Reel) affects handling and assembly processes but does not affect electrical compatibility. The 1N4001G is supplied in Tape & Reel format, while most others are supplied in Cut Tape format.

Q: Which substitute offers the best inventory availability?

A: The 1N4001-G (Comchip Technology) offers the highest inventory availability with 56269 units in stock. For applications requiring immediate supply, this part provides the shortest lead time while maintaining full electrical and mechanical compatibility with the SF11G A0G.

Q: Do I need to perform circuit testing when switching from SF11G A0G to a substitute part?

A: Circuit validation depends on application sensitivity to forward voltage, reverse recovery time, and capacitance variations. Applications with tight power budgets or high-frequency switching should evaluate the specific electrical characteristics of the selected substitute. Standard rectification circuits typically accommodate the parameter variations listed in the Parameter Comparison table without modification.

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