SF4002-TR Equivalent & Substitute Parts

Part Overview

The SF4002-TR 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 packaged in SOD-57 axial configuration and is ROHS3 compliant with unlimited moisture sensitivity level.

Substitute parts are necessary when the SF4002-TR reaches end-of-life status, when inventory constraints occur, or when alternative packaging formats are required for specific application requirements while maintaining electrical compatibility.

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 @ 600 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-TR is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1 V @ 1 A
Mounting Type: Through Hole
Current - Reverse Leakage @ Vr: 5 µA

Compatible Variation Parameters:

Reverse Recovery Time (trr): Fast recovery (≤500 ns) or standard recovery (>500 ns) are both acceptable
Operating Temperature Range: Minimum junction temperature must not exceed -55°C; maximum must not be lower than 175°C
Package / Case: SOD-57, DO-41, and DO-204AL axial packages are mechanically compatible for through-hole mounting
Technology: Avalanche or standard diode technology both satisfy the electrical requirements

All substitute parts listed maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Parameter Comparison

Parameter	SF4002-TR (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 @ 600 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V
Operating Temperature - Junction	-55 to 175°C	-65 to 150°C	-65 to 175°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-204AC, DO-41, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified
Product Status	Active	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

1N4002G-T (Diodes Incorporated)

The 1N4002G-T is the primary substitute for the SF4002-TR. This part maintains identical electrical specifications (100 V, 1 A, 1 V forward voltage) and extends the maximum operating temperature to 175°C, matching the SF4002-TR upper limit. The part is in active product status with ROHS3 compliance. The DO-41 package is mechanically compatible with through-hole mounting applications. Standard recovery characteristics (2 µs reverse recovery time) differ from the SF4002-TR's fast recovery (50 ns), but both satisfy the mandatory electrical parameters.

EGP10B (Fairchild Semiconductor)

The EGP10B provides fast recovery characteristics (50 ns) identical to the SF4002-TR, with matching voltage and current ratings. The DO-204AL package is mechanically compatible for through-hole applications. The maximum operating temperature is limited to 150°C, which is 25°C below the SF4002-TR specification. This part is suitable for applications where the upper temperature limit does not exceed 150°C and fast recovery performance is required.

UF4002 (Fairchild Semiconductor)

The UF4002 offers fast recovery performance (50 ns) and extends the maximum operating temperature to 175°C, matching the SF4002-TR. Forward voltage and current ratings are identical. The DO-204AC package is mechanically compatible for through-hole mounting. This part is in active product status and suitable for applications requiring fast recovery characteristics across the full temperature range.

1N4002-T (Diodes Incorporated)

The 1N4002-T is designated as Last Time Buy status, indicating this part is approaching end-of-life. While electrical specifications match the SF4002-TR (100 V, 1 A, 1 V forward voltage), the maximum operating temperature is limited to 150°C. This part should be selected only when inventory availability is critical and application temperature requirements do not exceed 150°C.

Frequently Asked Questions (FAQ)

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

A: All listed substitute parts meet the mandatory electrical specifications (100 V reverse voltage, 1 A current, 1 V forward voltage, 5 µA reverse leakage). Direct replacement is possible from an electrical standpoint. Physical package differences (SOD-57 versus DO-41/DO-204AL/DO-204AC) require verification of board layout and mounting hole compatibility.

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

A: The SF4002-TR features fast recovery with 50 ns reverse recovery time. The 1N4002-T and 1N4002G-T have standard recovery characteristics (>500 ns and 2 µs respectively). Fast recovery diodes switch off more quickly, reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification applications. Both types satisfy the mandatory electrical parameters for this 100 V, 1 A application.

Q: Are there temperature limitations when substituting the SF4002-TR?

A: The SF4002-TR operates from -55°C to 175°C. The 1N4002-T and EGP10B are limited to 150°C maximum, which is 25°C below the SF4002-TR specification. The 1N4002G-T and UF4002 extend to 175°C. Applications requiring operation above 150°C must use either the 1N4002G-T or UF4002.

Q: What are the package differences, and do they affect substitution?

A: The SF4002-TR uses SOD-57 axial packaging. Substitute parts use DO-41, DO-204AL, or DO-204AC axial packages. All are through-hole axial configurations with similar physical dimensions. Board layout and mounting hole spacing must be verified to ensure mechanical compatibility. Axial lead spacing and diameter may vary slightly between package types.

Q: Which substitute part should be selected for new designs?

A: The 1N4002G-T is recommended for new designs. It maintains active product status, ROHS3 compliance, full temperature range compatibility (-65°C to 175°C), and standard recovery characteristics suitable for general-purpose rectification. The UF4002 is an alternative if fast recovery performance is required.

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

A: Last Time Buy status indicates the manufacturer is discontinuing this part. Existing inventory may be available, but future procurement is not guaranteed. This part should be selected only when current inventory is sufficient for the application lifecycle or when alternative parts are unavailable.

Q: Are all substitute parts ROHS3 compliant?

A: The SF4002-TR, 1N4002-T, and 1N4002G-T are explicitly ROHS3 compliant. The EGP10B and UF4002 do not have ROHS status specified in the provided data. Applications requiring ROHS3 certification should prioritize the 1N4002G-T or UF4002 with confirmed compliance documentation.

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