SF16G General Purpose Rectifier Diode 400V 1A DO-204AL Equivalent & Substitute Parts

Part Overview

The SF16G is a general purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400V DC reverse voltage and 1A average rectified current in a DO-204AL (DO-41) through-hole package. This diode is classified as a fast recovery device with a reverse recovery time of 35 nanoseconds and operates across a junction temperature range of -55°C to 150°C. The part is RoHS3 compliant and carries an active product status.

Equivalent and substitute parts are identified based on matching electrical specifications including reverse voltage rating, forward current capacity, package type, and mounting configuration. Alternative sources and variants are necessary to ensure supply chain flexibility, accommodate design revisions, and address component availability across different manufacturing regions and procurement channels.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	1.3	V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	10	pF @ 4V, 1MHz
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SF16G are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents share identical or functionally equivalent electrical specifications across all critical parameters: 400V reverse voltage rating, 1A average rectified current, fast recovery speed classification, DO-204AL package, through-hole mounting, and identical operating temperature range. These parts are direct functional replacements with no design modifications required.

Similar Parts maintain the same voltage and current ratings, package type, and mounting configuration but differ in one or more secondary parameters such as recovery speed classification (standard recovery versus fast recovery), reverse recovery time, forward voltage drop, reverse leakage current, or capacitance. These parts are suitable for applications where the secondary parameter differences do not impact circuit performance.

The following parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) Maximum: 400V (mandatory match)
Current - Average Rectified (Io): 1A (mandatory match)
Package / Case: DO-204AL, DO-41, Axial (mandatory match)
Mounting Type: Through Hole (mandatory match)
Operating Temperature Range: -55°C minimum, 150°C minimum (mandatory match or exceed)

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package	Temp Range [°C]	Status
SF16G	Taiwan Semiconductor	400	1	1.3 @ 1A	Fast Recovery ≤ 500ns	35	5 @ 400V	10 @ 4V, 1MHz	DO-204AL	-55 to 150	Active
SF16GH	Taiwan Semiconductor	400	1	1.3 @ 1A	Fast Recovery ≤ 500ns	35	5 @ 400V	10 @ 4V, 1MHz	DO-204AL	-55 to 150	Active (AEC-Q101)
FR104G A0G	Taiwan Semiconductor	400	1	1.3 @ 1A	Fast Recovery ≤ 500ns	150	5 @ 400V	10 @ 4V, 1MHz	DO-204AL	-55 to 150	Active
HER105G	Taiwan Semiconductor	400	1	1.3 @ 1A	Fast Recovery ≤ 500ns	50	5 @ 400V	15 @ 4V, 1MHz	DO-204AL	-55 to 150	Active
1N4004-E3/54	Vishay General Semiconductor	400	1	1.1 @ 1A	Standard Recovery >500ns	—	5 @ 400V	15 @ 4V, 1MHz	DO-204AL	-55 to 150	Active
1N4004-E3/73	Vishay General Semiconductor	400	1	1.1 @ 1A	Standard Recovery >500ns	—	5 @ 400V	15 @ 4V, 1MHz	DO-204AL	-55 to 150	Active
1N4004-G	Comchip Technology	400	1	1.1 @ 1A	Standard Recovery >500ns	—	5 @ 400V	15 @ 4V, 1MHz	DO-41	-55 to 150	Active
1N4004-T	Diodes Incorporated	400	1	1.0 @ 1A	Standard Recovery >500ns	—	5 @ 400V	15 @ 4V, 1MHz	DO-41	-65 to 150	Last Time Buy
1N4004E-E3/54	Vishay General Semiconductor	400	1	1.1 @ 1A	Standard Recovery >500ns	—	5 @ 400V	15 @ 4V, 1MHz	DO-204AL	-55 to 150	Active
1N4004G	Rectron USA	400	1	1.0 @ 1A	Standard Recovery >500ns	—	0.2 @ 400V	15 @ 4V, 1MHz	DO-41	-65 to 175	Active (AEC-Q101)
1N4004GP-E3/54	Vishay General Semiconductor	400	1	1.1 @ 1A	Standard Recovery >500ns	2000	5 @ 400V	8 @ 4V, 1MHz	DO-204AL	-65 to 175	Active

Engineering Selection Recommendations

Parametric Equivalent Selection (Direct Replacement)

The SF16GH is a parametric equivalent of the SF16G with identical electrical specifications and fast recovery characteristics. The SF16GH carries AEC-Q101 automotive qualification, making it suitable for applications requiring automotive-grade components. Both parts share the same reverse recovery time of 35 nanoseconds and forward voltage drop of 1.3V at 1A.

The FR104G A0G is a parametric equivalent with matching voltage, current, and package specifications. The reverse recovery time is 150 nanoseconds, which is longer than the SF16G but remains within the fast recovery classification. This part is suitable for applications where the extended recovery time does not impact circuit timing requirements.

The HER105G is a parametric equivalent with a reverse recovery time of 50 nanoseconds, positioning it between the SF16G and FR104G A0G in terms of switching speed. The capacitance is specified at 15pF compared to 10pF for the SF16G. This part is suitable for general purpose rectification applications.

Similar Part Selection (Functional Replacement with Considerations)

The 1N4004 series parts (1N4004-E3/54, 1N4004-E3/73, 1N4004-G, 1N4004E-E3/54, 1N4004GP-E3/54) are classified as standard recovery diodes with recovery times exceeding 500 nanoseconds. These parts maintain the 400V reverse voltage and 1A current ratings but exhibit slower switching characteristics compared to the SF16G. The forward voltage drop is typically 1.0V to 1.1V at 1A, which is lower than the SF16G specification of 1.3V.

The 1N4004-T from Diodes Incorporated carries a Last Time Buy product status, indicating that this part is no longer in active production. New designs should not incorporate this part number.

The 1N4004G from Rectron USA carries AEC-Q101 automotive qualification and features an extended operating temperature range of -65°C to 175°C, compared to the SF16G range of -55°C to 150°C. The reverse leakage current is specified at 200 nanoamperes, which is significantly lower than the 5 microamperes specified for the SF16G.

The 1N4004GP-E3/54 from Vishay is designated as a SUPERECTIFIER® product with a reverse recovery time of 2 microseconds, which is substantially longer than the SF16G. This part is suitable for low-frequency rectification applications where switching speed is not a critical parameter.

All substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the SF16G specifications.

Frequently Asked Questions (FAQ)

Q: Can the SF16GH be used as a direct replacement for the SF16G?

A: Yes. The SF16GH is a parametric equivalent with identical electrical specifications, including 400V reverse voltage, 1A average rectified current, 1.3V forward voltage drop at 1A, and 35 nanosecond reverse recovery time. The SF16GH carries AEC-Q101 automotive qualification, which is an additional qualification not specified for the SF16G. No circuit modifications are required for substitution.

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

A: Fast recovery diodes have reverse recovery times of 500 nanoseconds or less, while standard recovery diodes exceed 500 nanoseconds. The SF16G is classified as fast recovery with a 35 nanosecond reverse recovery time. Standard recovery diodes such as the 1N4004 series are suitable for low-frequency applications where switching speed is not critical. Fast recovery diodes are preferred in high-frequency switching applications and power factor correction circuits.

Q: Can a standard recovery 1N4004 diode replace the fast recovery SF16G?

A: Substitution is possible if the application does not require fast switching characteristics. The 1N4004 series maintains the same 400V reverse voltage and 1A current ratings and operates across the same temperature range. However, the extended reverse recovery time may cause increased switching losses and electromagnetic interference in high-frequency circuits. Circuit performance should be evaluated before substitution in switching applications.

Q: What does the DO-204AL package designation mean?

A: DO-204AL is the formal JEDEC package designation for a through-hole axial lead diode, commonly referred to as DO-41. The package consists of a cylindrical ceramic body with axial leads suitable for insertion into printed circuit board holes or breadboard applications. All substitute parts listed maintain this package configuration or the equivalent DO-41 designation.

Q: Are all listed substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification, matching the SF16G specification. RoHS3 compliance indicates that the parts do not contain restricted substances including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive electronics qualification standard that establishes reliability and performance requirements for semiconductor components used in automotive applications. Parts carrying AEC-Q101 qualification, such as the SF16GH and 1N4004G, have undergone additional testing and validation for automotive environments. These parts are suitable for applications requiring automotive-grade components but may carry higher cost compared to non-qualified equivalents.

Q: Why is the 1N4004-T listed as Last Time Buy?

A: Last Time Buy status indicates that the manufacturer has discontinued active production of this part number. Existing inventory may be available for a limited time, but new designs should not incorporate this part. The 1N4004-T should be replaced with an active product such as 1N4004-E3/54 or 1N4004E-E3/54 for long-term supply chain stability.

Q: What is the difference between the 1N4004-E3/54 and 1N4004-E3/73 part numbers?

A: Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications. The primary difference is packaging: 1N4004-E3/54 is supplied in Cut Tape (CT) format, while 1N4004-E3/73 is supplied in Tape & Box (TB) format. The electrical performance and component functionality are identical. Selection between these variants depends on procurement and assembly requirements.

Q: Can the 1N4004GP-E3/54 SUPERECTIFIER® be used in place of the SF16G?

A: The 1N4004GP-E3/54 maintains the same 400V reverse voltage and 1A current ratings but exhibits significantly different switching characteristics. The reverse recovery time is 2 microseconds compared to 35 nanoseconds for the SF16G. This part is suitable for low-frequency rectification applications such as power supplies but is not recommended for high-frequency switching applications where the SF16G is specified. Circuit performance evaluation is required before substitution.

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