SF5405-TAP Equivalent & Substitute Parts

Part Overview

The SF5405-TAP is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This component is rated for 500 V DC reverse voltage with 3 A average rectified current and features fast recovery characteristics with a reverse recovery time of 75 ns. The device is housed in a SOD-64 axial package and is designed for through-hole mounting applications. The SF5405-TAP maintains Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining functional compatibility in target applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	500	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5 µA @ 500 V	µA
Mounting Type	Through Hole	—
Package / Case	SOD-64, Axial	—
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SF5405-TAP is determined by equivalence in the following critical parameters:

Electrical Performance Criteria:

Current rating: 3 A average rectified current (Io)
Voltage rating: Minimum 500 V DC reverse voltage (Vr)
Speed classification: Fast recovery diode with reverse recovery time ≤ 500 ns
Forward voltage: Operating characteristics at 3 A forward current

Mechanical & Environmental Criteria:

Mounting type: Through-hole configuration
Package style: Axial lead diode package
Temperature range: Operating junction temperature capability
Compliance: RoHS3 and REACH status

The STTH3L06 qualifies as a substitute because it maintains the 3 A current rating, exceeds the 500 V reverse voltage requirement at 600 V, operates within the fast recovery speed classification, and is housed in a through-hole axial package (DO-201AD). Both components are RoHS3 compliant and REACH unaffected.

Parameter Comparison

Parameter	SF5405-TAP (Vishay)	STTH3L06 (STMicroelectronics)	Unit
Voltage - DC Reverse (Vr) (Max)	500	600	V
Current - Average Rectified (Io)	3	3	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 3 A	1.3 @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	—
Reverse Recovery Time (trr)	75	85	ns
Current - Reverse Leakage @ Vr	5 µA @ 500 V	3 µA @ 600 V	µA
Mounting Type	Through Hole	Through Hole	—
Package / Case	SOD-64, Axial	DO-201AD, Axial	—
Operating Temperature - Junction (Max)	175	175	°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Product Status	Active	Active	—

Engineering Selection Recommendations

SF5405-TAP (Primary Component)

The SF5405-TAP is the original specification component. Selection is appropriate when SOD-64 package geometry is required and 500 V reverse voltage rating is sufficient for the application. This component is Active status with full RoHS3 compliance and REACH unaffected designation.

STTH3L06 (Substitute Component)

The STTH3L06 is suitable as a substitute when the following conditions are met:

Application circuit can accommodate DO-201AD package dimensions in place of SOD-64
Higher reverse voltage rating (600 V) does not create design conflicts
Lower forward voltage drop (1.3 V vs. 1.7 V @ 3 A) is acceptable or beneficial
Slightly higher reverse recovery time (85 ns vs. 75 ns) is within system tolerance

Both components maintain Active product status, RoHS3 compliance, and REACH unaffected status. The STTH3L06 offers improved reverse leakage characteristics (3 µA @ 600 V) and reduced forward voltage, which may provide thermal and efficiency benefits in power conversion applications.

Frequently Asked Questions (FAQ)

Q: Can the STTH3L06 directly replace the SF5405-TAP in all applications?

A: Electrical substitution is valid when the application operates at or below 500 V reverse bias and can tolerate the DO-201AD package footprint. Physical board layout and lead spacing must be verified for mechanical compatibility.

Q: What is the primary difference between these two diodes?

A: The STTH3L06 provides higher reverse voltage rating (600 V vs. 500 V), lower forward voltage drop (1.3 V vs. 1.7 V @ 3 A), and different package geometry (DO-201AD vs. SOD-64). Both maintain identical 3 A current rating and fast recovery speed classification.

Q: Are there package compatibility concerns?

A: Yes. The SF5405-TAP uses SOD-64 axial package while the STTH3L06 uses DO-201AD axial package. Physical dimensions and lead spacing differ. PCB layout and mechanical clearances must be evaluated before substitution.

Q: Do both components meet the same compliance standards?

A: Yes. Both the SF5405-TAP and STTH3L06 are RoHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification.

Q: What is the significance of the lower forward voltage in the STTH3L06?

A: The STTH3L06 forward voltage of 1.3 V @ 3 A compared to 1.7 V @ 3 A in the SF5405-TAP results in reduced power dissipation and heat generation during forward conduction, which may improve overall circuit efficiency.

Q: Is the reverse recovery time difference significant?

A: The STTH3L06 reverse recovery time of 85 ns versus 75 ns in the SF5405-TAP represents a 10 ns difference. Both remain within the fast recovery classification (≤ 500 ns). Significance depends on switching frequency and circuit requirements.

Q: Can I use the SF5405-TAP in an application designed for 600 V operation?

A: No. The SF5405-TAP is rated for maximum 500 V reverse voltage. Using it in a 600 V application exceeds component ratings and creates reliability risk.

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