STTA406 Equivalent & Substitute Parts

Part Overview

The STTA406 is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 4 A average rectified current in a through-hole DO-201AD axial package. This device belongs to the TURBOSWITCH™ series and features fast recovery characteristics with a reverse recovery time of 55 ns. The STTA406 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.75 @ 4 A	V
Speed Classification	Fast Recovery ≤ 500ns	-
Reverse Recovery Time (trr)	55	ns
Current - Reverse Leakage @ Vr	50	µA @ 600 V
Mounting Type	Through Hole	-
Package / Case	DO-201AD, Axial	-
Operating Temperature - Junction (Max)	125	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the STTA406 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 600 V to ensure safe operation in the original circuit.

Current Rating: The average rectified current must be sufficient to handle the 4 A requirement. Parts rated at 3 A are below specification and represent downrating. Parts rated at 5 A or higher provide current margin.

Package and Mounting: The DO-201AD axial through-hole package is the primary form factor. Substitutes must use compatible axial packages (DO-201AD, DO-27, DO-201AA) to ensure mechanical fit and lead compatibility.

Recovery Speed: The STTA406 is classified as fast recovery (≤ 500 ns). Substitutes with standard recovery characteristics (> 500 ns) represent a functional change and are acceptable only when circuit design permits slower switching behavior.

Reverse Leakage Current: The STTA406 specifies 50 µA at 600 V. Substitutes with lower leakage (5 µA to 10 µA) represent improved performance. Higher leakage values are not acceptable.

Compliance and Status: Active product status is preferred for long-term availability. RoHS3 compliance and REACH unaffected status are mandatory for regulatory conformance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Status
STTA406	STMicroelectronics	600	4	1.75 @ 4A	Fast Recovery ≤ 500ns	55	50 @ 600V	DO-201AD	Obsolete
STTH5L06	STMicroelectronics	600	5	1.3 @ 5A	Fast Recovery ≤ 500ns	95	5 @ 600V	DO-201AD	Active
1N5406-G	Comchip Technology	600	3	1 @ 3A	Standard Recovery > 500ns	-	5 @ 600V	DO-201AD	Active
1N5406G	Taiwan Semiconductor Corporation	600	3	1 @ 3A	Standard Recovery > 500ns	-	5 @ 600V	DO-201AD	Active
1N5406GP-AP	Micro Commercial Co	600	3	1.1 @ 3A	Standard Recovery > 500ns	-	5 @ 600V	DO-201AD	Active
1N5406GP-TP	Micro Commercial Co	600	3	1.1 @ 3A	Standard Recovery > 500ns	-	5 @ 600V	DO-201AD	Active
1N5406RLG	onsemi	600	3	1 @ 3A	Standard Recovery > 500ns	-	10 @ 600V	DO-201AA/DO-27	Not For New Designs
1N6628U	Microchip Technology	660	1.75	1.35 @ 2A	Fast Recovery ≤ 500ns	45	2 @ 660V	SQ-MELF, B	Active
60S6-TP	Micro Commercial Co	600	6	1 @ 6A	Standard Recovery > 500ns	-	5 @ 600V	DO-201AD	Active
BY253P-E3/73	Vishay General Semiconductor - Diodes Division	600	3	1.1 @ 3A	Standard Recovery > 500ns	3000	5 @ 600V	DO-201AD	Active
BYV28-600-TAP	Vishay General Semiconductor - Diodes Division	600	3.5	1.35 @ 5A	Fast Recovery ≤ 500ns	210	5 @ 600V	SOD-64	Active

Engineering Selection Recommendations

Primary Substitute - STTH5L06 (STMicroelectronics)

The STTH5L06 is the most direct substitute for the STTA406. Both devices are manufactured by STMicroelectronics, share identical 600 V voltage ratings, and use the DO-201AD package. The STTH5L06 provides 5 A current capacity, exceeding the STTA406 specification of 4 A. Both devices feature fast recovery characteristics (≤ 500 ns). The STTH5L06 is active product status with ROHS3 compliance and REACH unaffected designation. The lower forward voltage (1.3 V vs. 1.75 V) and significantly lower reverse leakage current (5 µA vs. 50 µA) represent improved electrical performance.

Secondary Substitutes - 1N5406 Series (Multiple Manufacturers)

The 1N5406 base part number is available from Comchip Technology (1N5406-G), Taiwan Semiconductor Corporation (1N5406G), Micro Commercial Co (1N5406GP-AP, 1N5406GP-TP), and onsemi (1N5406RLG). All variants maintain 600 V voltage rating and DO-201AD package compatibility. These parts are rated at 3 A, representing a current downrating from the STTA406 specification of 4 A. All 1N5406 variants feature standard recovery characteristics (> 500 ns), which differs from the STTA406 fast recovery specification. These parts are suitable for applications where the 4 A current requirement can be accommodated by 3 A devices or where switching speed is not performance-critical. All active variants carry ROHS3 compliance and REACH unaffected status.

Higher Current Alternative - 60S6-TP (Micro Commercial Co)

The 60S6-TP provides 6 A current capacity in the DO-201AD package with 600 V voltage rating. This part offers current margin above the STTA406 specification. The 60S6-TP features standard recovery characteristics. This device is suitable for applications requiring higher current capacity or where fast recovery is not required.

Avalanche Technology Alternative - BYV28-600-TAP (Vishay)

The BYV28-600-TAP is an avalanche-rated diode with 600 V voltage rating and 3.5 A current capacity in SOD-64 package. This device features fast recovery characteristics (210 ns) and is suitable for applications requiring avalanche protection. The SOD-64 package differs from the DO-201AD form factor and requires mechanical redesign.

Not Recommended for New Designs - 1N5406RLG (onsemi)

The 1N5406RLG carries product status "Not For New Designs" and is not suitable for new circuit development, despite technical compatibility.

Not Suitable - 1N6628U (Microchip Technology)

The 1N6628U is a surface-mount device in SQ-MELF package with 1.75 A current rating. This part is not suitable as a direct substitute due to different mounting technology and insufficient current capacity.

Frequently Asked Questions (FAQ)

Q: Can the STTA406 be replaced with a 3 A rated diode such as the 1N5406 series?

A: The 1N5406 series devices are rated at 3 A, which is below the STTA406 specification of 4 A. Substitution is possible only if the circuit design permits operation at reduced current capacity. The application must be evaluated to confirm that peak and average current demands do not exceed 3 A. If the circuit requires the full 4 A capability, the STTH5L06 (5 A) or 60S6-TP (6 A) are appropriate alternatives.

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

A: The STTA406 features fast recovery with a reverse recovery time of 55 ns. Standard recovery diodes such as the 1N5406 series have reverse recovery times exceeding 500 ns. Fast recovery diodes switch off more quickly, reducing switching losses and electromagnetic interference. Standard recovery diodes are acceptable in applications where switching speed is not performance-critical, such as low-frequency rectification circuits. High-frequency switching applications require fast recovery characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed carry ROHS3 compliance designation. The 1N5406RLG, marked "Not For New Designs," also carries ROHS3 compliance but is not recommended for new circuit development. Compliance status is mandatory for regulatory conformance in most markets.

Q: Can the STTA406 be replaced with a surface-mount diode?

A: The STTA406 is a through-hole axial device. Surface-mount substitutes such as the 1N6628U require different PCB layout, assembly processes, and mechanical mounting. Surface-mount alternatives are not direct substitutes and require circuit board redesign. Through-hole alternatives maintain mechanical and electrical compatibility with existing designs.

Q: What is the significance of reverse leakage current in diode selection?

A: The STTA406 specifies 50 µA reverse leakage at 600 V. Most substitute parts specify 5 µA to 10 µA, representing lower leakage. Lower reverse leakage reduces standby power consumption and improves circuit performance in high-impedance applications. Higher leakage values are not acceptable as they increase power dissipation and may affect circuit operation.

Q: Is the STTH5L06 a direct replacement for the STTA406?

A: The STTH5L06 is the most compatible substitute. Both devices are manufactured by STMicroelectronics, share 600 V voltage rating, use DO-201AD package, and feature fast recovery characteristics. The STTH5L06 provides higher current capacity (5 A vs. 4 A), lower forward voltage, and lower reverse leakage. The STTH5L06 is active product status, ensuring long-term availability. No circuit modifications are required for substitution.

Q: Can multiple lower-rated diodes be used in parallel to replace the STTA406?

A: Parallel connection of diodes requires careful design consideration including current sharing resistors and thermal management. This approach is not a direct substitution and introduces additional circuit complexity. Single-device alternatives such as the STTH5L06 or 60S6-TP are preferred for direct replacement.

Q: What packaging options are available for 600 V, 4+ A rectifier diodes?

A: The primary through-hole packages for this current and voltage class are DO-201AD (axial) and SOD-64 (axial). The STTH5L06 and 60S6-TP are available in DO-201AD. The BYV28-600-TAP is available in SOD-64. Surface-mount alternatives exist but require PCB redesign. Axial packages maintain compatibility with existing through-hole designs.

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