STTA406RL Equivalent & Substitute Parts

Part Overview

The STTA406RL is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 4 A average rectified current in a DO-201AD axial through-hole package. This device is part of the TURBOSWITCH™ series and features fast recovery characteristics with a reverse recovery time of 55 ns. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing applications and new designs. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating packaging and performance requirements.

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 V @ 4 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
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 STTA406RL is determined by the following critical parameters:

Voltage Compatibility: All substitute parts must maintain a DC reverse voltage rating (Vr) of 600 V or greater to ensure safe operation in the original circuit.

Current Rating: Substitute parts must support an average rectified current (Io) of 4 A or higher. Parts rated below 4 A are not suitable for direct substitution but may be considered for applications with reduced current requirements.

Package and Mounting: The original part uses a DO-201AD axial through-hole package. Substitutes with identical or compatible package designations (DO-201AD, DO-27, Axial) maintain mechanical and electrical compatibility with existing PCB layouts.

Recovery Characteristics: The STTA406RL features fast recovery (≤ 500ns). Substitutes with standard recovery characteristics (> 500ns) represent functional alternatives but with different switching performance profiles.

Compliance and Status: RoHS3 compliance and REACH unaffected status are maintained across all listed substitutes, ensuring regulatory alignment.

Substitute parts are grouped into three categories:

Direct Equivalents (4 A or Higher Current Rating): Parts meeting or exceeding the 4 A current specification with 600 V voltage rating and compatible packaging.
Functional Alternatives (3 A Current Rating): Parts rated for 3 A average rectified current, suitable for applications where the original 4 A specification exceeds actual circuit requirements.
Enhanced Performance Variants: Parts with higher current ratings (5 A, 6 A) or improved thermal characteristics, applicable where circuit design permits.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Tj (Max) [°C]	Status
STTA406RL	STMicroelectronics	600	4	1.75 @ 4 A	Fast Recovery ≤ 500ns	55	50 @ 600 V	DO-201AD	125	Obsolete
STTH5L06RL	STMicroelectronics	600	5	1.3 @ 5 A	Fast Recovery ≤ 500ns	95	5 @ 600 V	DO-201AD	175	Active
1N5406-G	Comchip Technology	600	3	1 @ 3 A	Standard Recovery > 500ns	-	5 @ 600 V	DO-201AD	125	Active
1N5406G	Taiwan Semiconductor Corporation	600	3	1 @ 3 A	Standard Recovery > 500ns	-	5 @ 600 V	DO-201AD	150	Active
1N5406GP-AP	Micro Commercial Co	600	3	1.1 @ 3 A	Standard Recovery > 500ns	-	5 @ 600 V	DO-201AD	150	Active
1N5406GP-TP	Micro Commercial Co	600	3	1.1 @ 3 A	Standard Recovery > 500ns	-	5 @ 600 V	DO-201AD	150	Active
1N5406RLG	onsemi	600	3	1 @ 3 A	Standard Recovery > 500ns	-	10 @ 600 V	DO-201AA / DO-27	150	Not For New Designs
31DF6 A0G	Taiwan Semiconductor Corporation	600	3	1.7 @ 3 A	Fast Recovery ≤ 500ns	35	20 @ 600 V	DO-201AD	150	Active
60S6-TP	Micro Commercial Co	600	6	1 @ 6 A	Standard Recovery > 500ns	-	5 @ 600 V	DO-201AD	150	Active
BYV28-600-TAP	Vishay General Semiconductor - Diodes Division	600	3.5	1.35 @ 5 A	Fast Recovery ≤ 500ns	210	5 @ 600 V	SOD-64	175	Active

Engineering Selection Recommendations

For Direct Replacement (Active Status, Equivalent Performance):

The STTH5L06RL (STMicroelectronics) is the primary recommended substitute. It maintains the same 600 V voltage rating, exceeds the 4 A current requirement at 5 A, uses the identical DO-201AD package, and is classified as Active. The higher maximum junction temperature (175°C vs. 125°C) provides improved thermal margin. Both parts are ROHS3 compliant and REACH unaffected.

For Current-Reduced Applications (3 A Sufficient):

Multiple active alternatives exist for applications where 3 A average rectified current meets circuit requirements:

1N5406-G (Comchip Technology), 1N5406G (Taiwan Semiconductor Corporation), 1N5406GP-AP (Micro Commercial Co), and 1N5406GP-TP (Micro Commercial Co) all provide 600 V / 3 A ratings in DO-201AD packages with Active product status. These parts employ standard recovery characteristics (> 500ns) rather than fast recovery, resulting in different switching behavior. All maintain ROHS3 compliance and REACH unaffected status.

For Enhanced Current Capacity:

The 60S6-TP (Micro Commercial Co) provides 600 V / 6 A capability in a DO-201AD package with Active status, suitable for applications requiring higher current handling. Standard recovery characteristics apply.

For Fast Recovery Requirement with 3 A Rating:

The 31DF6 A0G (Taiwan Semiconductor Corporation) maintains fast recovery characteristics (35 ns trr) at 600 V / 3 A in a DO-201AD package with Active status, providing an alternative for applications prioritizing switching speed over current capacity.

Parts to Avoid for New Designs:

The 1N5406RLG (onsemi) is classified as "Not For New Designs" and should not be selected for new circuit implementations, despite its Active inventory status.

The 1N6628U (Microchip Technology) uses a surface-mount SQ-MELF package incompatible with through-hole PCB layouts and is therefore not suitable as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can the STTH5L06RL directly replace the STTA406RL in existing circuits?

A: Yes. The STTH5L06RL maintains the same 600 V voltage rating, identical DO-201AD package, and exceeds the 4 A current requirement. Both parts are ROHS3 compliant and REACH unaffected. The higher maximum junction temperature (175°C) provides improved thermal performance. The primary difference is the higher reverse recovery time (95 ns vs. 55 ns), which affects switching characteristics but does not prevent direct substitution in standard rectification applications.

Q: Why are 3 A rated parts listed as substitutes for a 4 A device?

A: Parts rated for 3 A average rectified current are included as functional alternatives for applications where the original 4 A specification exceeds actual circuit requirements. Circuit analysis must confirm that peak and average current demands do not exceed 3 A before selecting these parts. These alternatives provide cost or availability advantages when current capacity permits.

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

A: Fast recovery diodes (≤ 500ns reverse recovery time) switch off more quickly, reducing switching losses and enabling higher frequency operation. Standard recovery diodes (> 500ns) have slower switching characteristics but may provide other performance benefits. Selection depends on circuit switching frequency and efficiency requirements. The STTA406RL specifies fast recovery; substitutes with standard recovery characteristics alter switching behavior.

Q: Are all listed substitutes compatible with the original DO-201AD package footprint?

A: Most substitutes use DO-201AD or equivalent axial through-hole packages (DO-27, DO-201AA) and are mechanically compatible with existing PCB layouts. The BYV28-600-TAP uses a SOD-64 package and is not compatible with DO-201AD footprints. The 1N6628U is a surface-mount device and incompatible with through-hole designs.

Q: What compliance certifications apply to substitute parts?

A: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original STTA406RL. These certifications ensure regulatory alignment for applications subject to environmental and hazardous substance restrictions.

Q: How does packaging format (Tape & Reel vs. Cut Tape vs. Tape & Box) affect substitution?

A: Packaging format affects supply chain logistics and handling but does not alter electrical or mechanical compatibility. Tape & Reel (TR), Cut Tape (CT), and Tape & Box (TB) formats are interchangeable from a circuit design perspective. Selection should be based on procurement volume and assembly process requirements.

Q: Can the 60S6-TP (6 A rated) be used in place of the STTA406RL?

A: Yes. The 60S6-TP provides 600 V / 6 A in a DO-201AD package with Active status. The higher current rating does not prevent substitution; the device will operate safely at 4 A or lower. Standard recovery characteristics (> 500ns) differ from the original fast recovery specification, affecting switching performance but not basic rectification function.

Q: Why is the 1N5406RLG marked "Not For New Designs"?

A: This designation indicates that while the part remains in inventory and is electrically functional, the manufacturer recommends against selecting it for new circuit designs. Active alternatives with superior specifications or longer product life cycles should be prioritized. Existing designs using this part may continue operation, but new implementations should select from Active status alternatives.

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