SF4003-TAP Equivalent & Substitute Parts

Part Overview

The SF4003-TAP is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 200 V DC reverse voltage and 1 A average rectified current in a through-hole SOD-57 axial package. This component is classified as Active and RoHS3 compliant. Substitute parts are necessary when the original part becomes unavailable, when alternative packaging formats are required for manufacturing flexibility, or when design specifications permit equivalent performance characteristics from alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	V @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Mounting Type	Through Hole	-
Package / Case	SOD-57, Axial	-
Operating Temperature - Junction	-55 to 175	°C
Technology	Avalanche	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SF4003-TAP is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Forward Voltage (Vf) compatibility at rated current

Allowable Variations:

Package format: SOD-57, DO-41, DO-204AL, and A (Axial) packages are mechanically and electrically compatible for through-hole applications
Technology classification: Avalanche and Standard recovery diodes are functionally equivalent at the specified voltage and current ratings
Reverse recovery time (trr): Fast recovery (≤ 500ns) and Standard recovery (> 500ns) classifications both satisfy the 200 V / 1 A application envelope
Reverse leakage current: Variations between 1 µA and 5 µA at 200 V are within acceptable operating margins
Operating temperature range: Minimum junction temperature of -50°C to -65°C and maximum of 150°C to 175°C are acceptable for general-purpose rectification

Non-Substitutable Parameters:

Voltage rating below 200 V
Current rating below 1 A
Non-through-hole mounting types

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	Speed	trr [ns]	Ir @ 200V [µA]	Package	Tj (Max) [°C]	RoHS Status	Status
SF4003-TAP	Vishay	200	1	1.0	Fast Recovery ≤ 500ns	50	5	SOD-57	175	ROHS3	Active
1N3611	Microchip	200	1	1.1	Standard > 500ns	-	1	A, Axial	175	Non-compliant	Active
1N4003-T	Diodes Inc.	200	1	1.0	Standard > 500ns	-	5	DO-41	150	ROHS3	Last Time Buy
EGP10D	Fairchild	200	1	0.95	Fast Recovery ≤ 500ns	50	5	DO-41	150	Not specified	Active
STTH102	STMicroelectronics	200	1	0.97	Fast Recovery ≤ 500ns	20	1	DO-41	175	ROHS3	Active
STTH102RL	STMicroelectronics	200	1	0.97	Fast Recovery ≤ 500ns	20	1	DO-41	175	ROHS3	Active
UF4003	Diotec	200	1	1.0	Fast Recovery ≤ 500ns	50	5	DO-41	175	ROHS3	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

STTH102RL and STTH102 from STMicroelectronics are the preferred substitutes. Both parts maintain identical electrical specifications to the SF4003-TAP (200 V, 1 A, fast recovery ≤ 500ns, 50 ns trr), feature RoHS3 compliance, and carry Active product status. The DO-41 package is mechanically compatible with through-hole PCB designs. STTH102RL offers superior inventory availability (15,420 pcs) compared to STTH102 (1,600 pcs).

UF4003 from Diotec Semiconductor provides equivalent performance with matching forward voltage (1.0 V @ 1 A), fast recovery characteristics (50 ns trr), and RoHS3 compliance. Active status and high inventory (15,210 pcs) support production continuity.

Secondary Substitutes (Acceptable with Design Review):

EGP10D from Fairchild Semiconductor meets all critical electrical parameters with slightly lower forward voltage (0.95 V @ 1 A) and identical reverse recovery time (50 ns). Active status and fast recovery classification ensure functional equivalence. RoHS compliance status is not specified in available documentation.

1N4003-T from Diodes Incorporated matches voltage and current ratings with identical forward voltage (1.0 V @ 1 A) and reverse leakage (5 µA @ 200 V). However, Last Time Buy status indicates limited future availability. Maximum junction temperature is 150°C versus 175°C for the original part.

Not Recommended:

1N3611 from Microchip Technology exhibits RoHS non-compliance, disqualifying it from applications requiring regulatory adherence. Standard recovery classification (> 500ns) differs from the SF4003-TAP fast recovery specification.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SF4003-TAP with a standard recovery diode instead of fast recovery?

A: Standard recovery diodes (trr > 500ns) meet the 200 V / 1 A electrical requirements and are functionally compatible for rectification applications. However, fast recovery variants (trr ≤ 500ns) provide superior switching performance in high-frequency circuits. Verify application frequency requirements before selecting standard recovery alternatives such as 1N3611 or 1N4003-T.

Q: Are DO-41 and SOD-57 packages interchangeable on the same PCB?

A: Both packages are through-hole axial formats with identical lead spacing and mounting methodology. DO-41 and SOD-57 packages are mechanically interchangeable on PCBs designed for axial component placement. Verify PCB pad dimensions and lead hole spacing match the selected package variant.

Q: What is the significance of reverse recovery time (trr) in diode selection?

A: Reverse recovery time determines the speed at which a diode transitions from forward conduction to reverse blocking. Fast recovery diodes (trr ≤ 500ns, typically 20-50ns) minimize switching losses and are preferred in switching power supplies and high-frequency rectification. Standard recovery diodes (trr > 500ns) are suitable for line-frequency (50/60 Hz) rectification and general-purpose applications where switching speed is not critical.

Q: Does RoHS3 compliance affect electrical performance?

A: RoHS3 compliance restricts hazardous substances but does not alter electrical performance. All RoHS3-compliant substitutes (STTH102RL, STTH102, UF4003, 1N4003-T) deliver identical electrical characteristics to compliant specifications. Non-compliant parts such as 1N3611 are excluded from applications requiring regulatory adherence in restricted markets.

Q: Can I use a diode with lower reverse leakage current (1 µA vs. 5 µA)?

A: Yes. Lower reverse leakage current (1 µA @ 200 V) is a performance improvement over the original specification (5 µA @ 200 V). STTH102, STTH102RL, and similar low-leakage variants reduce standby power dissipation and are direct substitutes without design modification.

Q: What inventory considerations apply to substitute selection?

A: STTH102RL (15,420 pcs), UF4003 (15,210 pcs), and 1N4003-T (38,027 pcs) offer high inventory availability for production continuity. STTH102 (1,600 pcs) and EGP10D (1,420 pcs) provide adequate stock for moderate-volume applications. 1N3611 (1,465 pcs) and SF4003-TAP (905 pcs) represent limited availability. Verify supplier lead times and minimum order quantities for long-term production planning.

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