SF4004-TAP Equivalent & Substitute Parts

Part Overview

The SF4004-TAP is an avalanche diode rated for 400 V DC reverse voltage and 1 A average rectified current, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component features fast recovery characteristics with a reverse recovery time of 50 ns and operates across a junction temperature range of -55°C to 175°C. The part is packaged in SOD-57 axial configuration and maintains active product status with full RoHS3 compliance.

Substitute parts become necessary when the SF4004-TAP experiences supply constraints, extended lead times, or when design flexibility permits selection from alternative manufacturers offering equivalent electrical performance within the same voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1 A
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Through Hole	-
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SF4004-TAP is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Axial package configuration

Compatible Electrical Characteristics:

Voltage - Forward (Vf) (Max) @ If: 1 V to 1.3 V @ 1 A
Current - Reverse Leakage @ Vr: 5 µA @ 400 V
Reverse Recovery Time (trr): 50 ns (fast recovery) or 2 µs (standard recovery)
Operating Temperature - Junction: Minimum -50°C, Maximum 150°C or higher

Compliance Requirements:

RoHS3 Compliant status
ECCN: EAR99
HTSUS: 8541.10.0080

Substitute parts may differ in package designation (SOD-57 versus DO-41/DO-204AL), technology classification (avalanche versus standard), and specific forward voltage characteristics, provided all mandatory criteria are satisfied.

Parameter Comparison

Parameter	SF4004-TAP (Main)	1N4004-T	1N4004G-T	EGP10G	UF1004-T	UF4004
Manufacturer	Vishay	Diodes Inc.	Diodes Inc.	Fairchild	Diodes Inc.	Diotec
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A	1.25 V @ 1 A	1.3 V @ 1 A	1.25 V @ 1 A
Reverse Recovery Time (trr)	50 ns	Not specified	2 µs	50 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Operating Temperature - Junction	-55 to 175°C	-65 to 150°C	-65 to 175°C	-65 to 150°C	-65 to 150°C	-50 to 175°C
Package / Case	SOD-57, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AC, DO-41, Axial
Product Status	Active	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not applicable

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

The 1N4004G-T, UF1004-T, and UF4004 are preferred substitutes due to active product status and confirmed availability. The 1N4004G-T offers the widest operating temperature range (-65°C to 175°C), matching the upper limit of the SF4004-TAP and providing extended low-temperature operation. Both UF1004-T and UF4004 deliver fast recovery characteristics (50 ns) identical to the main part, with UF4004 supporting the full upper temperature range of 175°C.

Secondary Substitute (Last Time Buy Status):

The 1N4004-T from Diodes Incorporated is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. This part remains electrically compatible but should be selected only when primary alternatives are unavailable, as future procurement will not be possible.

Package Compatibility Consideration:

All substitute parts utilize DO-41 or DO-204AL/DO-204AC axial packages, which are mechanically and electrically equivalent to the SOD-57 axial configuration of the SF4004-TAP. Through-hole mounting compatibility is maintained across all options.

Compliance Verification:

All recommended substitutes maintain RoHS3 compliance and EAR99 ECCN classification, ensuring regulatory alignment with the original part. The UF4004 from Diotec Semiconductor does not specify RoHS status; compliance verification with the component supplier is required before selection in regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the SF4004-TAP be directly replaced with a 1N4004G-T without circuit modification?

A: Yes. Both parts share identical voltage (400 V) and current (1 A) ratings, forward voltage characteristics (1 V @ 1 A), and reverse leakage (5 µA @ 400 V). The 1N4004G-T operates across -65°C to 175°C, fully encompassing the SF4004-TAP temperature range. Package differences (SOD-57 versus DO-41) do not affect electrical performance in through-hole applications.

Q: What is the difference between fast recovery (50 ns) and standard recovery (2 µs) diodes?

A: Reverse recovery time (trr) defines the interval required for a diode to transition from forward conduction to reverse blocking. Fast recovery diodes (50 ns) switch more rapidly, reducing switching losses in high-frequency applications. Standard recovery diodes (2 µs) are suitable for lower-frequency rectification. The SF4004-TAP specifies 50 ns fast recovery; substitutes with identical or faster recovery times maintain equivalent performance.

Q: Are DO-41 and SOD-57 packages interchangeable?

A: Both are axial through-hole packages with identical lead spacing and mounting methodology. DO-41 (DO-204AL) and SOD-57 differ in physical dimensions but occupy equivalent PCB footprints for standard through-hole applications. Mechanical clearance verification is recommended for space-constrained designs.

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

A: Last Time Buy status indicates the manufacturer has discontinued production. Existing inventory remains available for purchase, but no future manufacturing runs are planned. This part should be selected only when primary alternatives are exhausted, as long-term supply cannot be guaranteed.

Q: Does forward voltage variation (1 V to 1.3 V @ 1 A) affect circuit performance?

A: Forward voltage differences of 0.3 V are negligible in most rectification applications where the diode operates in series with load resistances significantly larger than the diode's dynamic resistance. In precision analog circuits or low-voltage applications, forward voltage variation may require circuit analysis. The SF4004-TAP specifies 1 V; UF1004-T and EGP10G specify 1.3 V and 1.25 V respectively.

Q: Which substitute offers the best long-term availability?

A: The 1N4004G-T from Diodes Incorporated is recommended for long-term supply security, with 23,750 units in current inventory and active product status. The UF1004-T and UF4004 also maintain active status with confirmed availability, though inventory levels are lower.

Q: Can the SF4004-TAP be used in applications requiring -55°C minimum temperature operation?

A: Yes. The SF4004-TAP operates to -55°C. However, most substitute parts (1N4004-T, 1N4004G-T, EGP10G, UF1004-T) specify -65°C minimum, providing additional low-temperature margin. The UF4004 specifies -50°C minimum, which does not meet the -55°C requirement.

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