SF4002-TAP Equivalent & Substitute Parts

Part Overview

The SF4002-TAP is an avalanche diode rated for 100 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 currently active in production and RoHS3 compliant.

Equivalent and substitute parts are necessary when the SF4002-TAP experiences supply constraints, end-of-life transitions, or when alternative packaging formats better suit specific assembly requirements. The substitute parts listed maintain electrical compatibility within the 100 V / 1 A rectifier diode category while offering different package configurations and recovery speed characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	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 @ 100 V
Mounting Type	Through Hole	-
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SF4002-TAP is determined by the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 1 A minimum
Voltage - Forward (Vf) (Max) @ If: 1 V or lower @ 1 A
Current - Reverse Leakage @ Vr: 5 µA or lower @ 100 V
Mounting Type: Through Hole
Operating Temperature - Junction: Must encompass or exceed -55°C to 175°C range

Secondary Compatibility Considerations:

Package / Case: SOD-57, DO-41, or DO-204AL axial configurations
Recovery Speed: Fast Recovery (≤500 ns) or Standard Recovery (>500 ns)
RoHS3 Compliance: Required

All substitute parts listed meet or exceed the primary electrical criteria. Variations in recovery speed and package configuration are noted to enable informed selection based on circuit requirements and assembly constraints.

Parameter Comparison

Parameter	SF4002-TAP (Main)	1N4002-T	1N4002G-T	EGP10B	UF4002
Manufacturer	Vishay General Semiconductor	Diodes Incorporated	Diodes Incorporated	Fairchild Semiconductor	Fairchild Semiconductor
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	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	950 mV @ 1 A	1 V @ 1 A
Speed	Fast Recovery ≤500ns	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤500ns	Fast Recovery ≤500ns
Reverse Recovery Time (trr)	50 ns	Not specified	2 µs	50 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V
Package / Case	SOD-57, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AC, DO-41, Axial
Operating Temperature - Junction	-55 to 175°C	-65 to 150°C	-65 to 175°C	-65 to 150°C	-50 to 175°C
Product Status	Active	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified

Engineering Selection Recommendations

1N4002G-T (Diodes Incorporated)

The 1N4002G-T is an active product offering full electrical compatibility with the SF4002-TAP across all primary parameters. This part maintains the 100 V / 1 A rating, identical forward voltage drop, and equivalent reverse leakage characteristics. The operating temperature range extends to 175°C, matching the SF4002-TAP upper limit. RoHS3 compliance is confirmed. The primary trade-off is standard recovery speed (2 µs reverse recovery time) versus the SF4002-TAP's fast recovery (50 ns). Selection of this part is appropriate for applications where recovery speed is not a critical constraint and DO-41 package compatibility exists.

EGP10B (Fairchild Semiconductor)

The EGP10B provides fast recovery characteristics (50 ns) matching the SF4002-TAP, with marginally lower forward voltage (950 mV @ 1 A). This part is actively produced with substantial inventory availability. The operating temperature range is -65°C to 150°C, which does not extend to the SF4002-TAP's 175°C upper limit. Selection of this part is suitable for applications operating below 150°C junction temperature where fast recovery performance is required and DO-204AL package compatibility is acceptable.

UF4002 (Fairchild Semiconductor)

The UF4002 delivers fast recovery performance (50 ns) and maintains full electrical compatibility across voltage, current, and leakage specifications. The operating temperature range of -50°C to 175°C covers the SF4002-TAP's upper temperature limit but does not extend to the lower -55°C specification. This part is actively produced. Selection is appropriate for applications requiring fast recovery and operating within the -50°C to 175°C range, with DO-204AC package compatibility.

1N4002-T (Diodes Incorporated)

The 1N4002-T is designated as Last Time Buy, indicating discontinued production with limited remaining inventory. While electrically compatible across primary parameters, the operating temperature range (-65°C to 150°C) does not extend to 175°C. Standard recovery speed (>500 ns) differs from the SF4002-TAP's fast recovery. This part should be selected only when existing designs mandate DO-41 package compatibility and supply from active alternatives is unavailable.

Frequently Asked Questions (FAQ)

Q: Can the SF4002-TAP be directly replaced with any of these substitute parts?

A: Direct replacement depends on circuit requirements and package constraints. All substitute parts meet the core electrical specifications (100 V, 1 A, 5 µA leakage). However, recovery speed differences and operating temperature ranges vary. The 1N4002G-T and UF4002 are recommended for new designs due to active product status. Package compatibility must be verified for the specific application.

Q: What is the significance of recovery speed differences between the SF4002-TAP and substitute parts?

A: The SF4002-TAP and EGP10B feature fast recovery (50 ns), while the 1N4002-T and 1N4002G-T employ standard recovery (>500 ns and 2 µs respectively). Fast recovery diodes minimize reverse current transients and are preferred in high-frequency switching applications. Standard recovery diodes are suitable for lower-frequency rectification. Circuit operating frequency determines whether recovery speed differences are functionally significant.

Q: Are all substitute parts RoHS3 compliant?

A: The SF4002-TAP, 1N4002-T, and 1N4002G-T are explicitly RoHS3 compliant. RoHS compliance status is not specified in the provided data for EGP10B and UF4002. Compliance verification with the component supplier is required if RoHS3 certification is a design requirement.

Q: What are the package differences between substitute parts?

A: The SF4002-TAP uses SOD-57 axial packaging. Substitute parts employ DO-41 (1N4002-T, 1N4002G-T, UF4002) or DO-204AL (EGP10B) axial configurations. These packages are mechanically similar through-hole formats but differ in physical dimensions and lead spacing. PCB layout and assembly equipment compatibility must be confirmed before substitution.

Q: Which substitute part is recommended for applications requiring the full -55°C to 175°C temperature range?

A: The 1N4002G-T and UF4002 both support the 175°C upper limit. The 1N4002G-T extends to -65°C (exceeding the -55°C lower limit), while the UF4002 operates from -50°C (not reaching the -55°C lower limit). For applications requiring the complete -55°C to 175°C range, the 1N4002G-T is the appropriate selection among active products.

Q: Why is the 1N4002-T listed as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production and is accepting final orders before complete discontinuation. Existing inventory may be available but will eventually deplete. For new designs or long-term production requirements, selection of active alternatives (1N4002G-T, EGP10B, or UF4002) is recommended to ensure supply continuity.

Q: Can forward voltage differences affect circuit performance?

A: The SF4002-TAP, 1N4002-T, 1N4002G-T, and UF4002 all specify 1 V forward voltage @ 1 A. The EGP10B specifies 950 mV @ 1 A, representing a 50 mV reduction. In precision rectification circuits or those with tight voltage budgets, this difference may be significant. In general-purpose applications, the 50 mV variation is typically negligible.

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