STTH4L06RL Equivalent & Substitute Parts

Part Overview

The STTH4L06RL 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 component is classified as obsolete, indicating it has been discontinued and is no longer recommended for new designs. Finding equivalent or substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support existing applications requiring this diode specification.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	75 ns
Current - Reverse Leakage @ Vr	3 µA @ 600 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction (Max)	175°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the STTH4L06RL 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 equivalent electrical performance in the application circuit.

Current Rating: The average rectified current capacity must be sufficient for the application. The STTH4L06RL is rated at 4 A. Substitutes with equal or higher current ratings (3 A, 4 A, 6 A, or 10 A) are acceptable, as higher-rated devices can safely handle lower current demands.

Recovery Characteristics: The STTH4L06RL features fast recovery (≤ 500ns) with a reverse recovery time of 75 ns. Substitutes with fast recovery characteristics maintain equivalent switching performance. Standard recovery diodes (> 500ns) represent a functional alternative but with different transient behavior.

Forward Voltage: Forward voltage drop at rated current affects power dissipation. The STTH4L06RL specifies 1.3 V @ 3 A. Substitutes with comparable forward voltage characteristics (1.0 V to 1.7 V range) are functionally equivalent.

Package Compatibility: The DO-201AD axial through-hole package is the primary mechanical requirement. All listed substitutes maintain this package format for direct board-level compatibility.

Compliance & Status: RoHS3 compliance and active product status are preferred for new applications, though obsolete parts may be acceptable for legacy system support.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Speed	trr (ns)	Ir @ Vr	Package	Product Status
STTH4L06RL	STMicroelectronics	600 V	4 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	75 ns	3 µA @ 600 V	DO-201AD	Obsolete
STTH4L06	STMicroelectronics	600 V	4 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	75 ns	3 µA @ 600 V	DO-201AD	Active
1N5406-G	Comchip Technology	600 V	3 A	1.0 V @ 3 A	Standard Recovery > 500ns	—	5 µA @ 600 V	DO-201AD	Active
1N5406G	Taiwan Semiconductor Corporation	600 V	3 A	1.0 V @ 3 A	Standard Recovery > 500ns	—	5 µA @ 600 V	DO-201AD	Active
1N5406GP-AP	Micro Commercial Co	600 V	3 A	1.1 V @ 3 A	Standard Recovery > 500ns	—	5 µA @ 600 V	DO-201AD	Active
1N5406GP-TP	Micro Commercial Co	600 V	3 A	1.1 V @ 3 A	Standard Recovery > 500ns	—	5 µA @ 600 V	DO-201AD	Active
1N5406RLG	onsemi	600 V	3 A	1.0 V @ 3 A	Standard Recovery > 500ns	—	10 µA @ 600 V	DO-201AA/DO-27	Not For New Designs
60S6-TP	Micro Commercial Co	600 V	6 A	1.0 V @ 6 A	Standard Recovery > 500ns	—	5 µA @ 600 V	DO-201AD	Active
EGP30J	onsemi	600 V	3 A	1.7 V @ 3 A	Fast Recovery ≤ 500ns	75 ns	5 µA @ 600 V	DO-201AD	Not For New Designs
FR305GP-AP	Micro Commercial Co	600 V	3 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	250 ns	5 µA @ 600 V	DO-201AD	Active
10A05GP-TP	Micro Commercial Co	600 V	10 A	1.2 V @ 10 A	Standard Recovery > 500ns	—	10 µA @ 600 V	R-6	Active

Engineering Selection Recommendations

Primary Equivalent (Parametric Match): STTH4L06 (STMicroelectronics, Cut Tape packaging) is the direct parametric equivalent to STTH4L06RL. This part maintains identical electrical specifications including 600 V reverse voltage, 4 A current rating, 1.3 V forward voltage, fast recovery characteristics, and 75 ns reverse recovery time. The part is currently in active production status, making it the preferred replacement for obsolete STTH4L06RL units. Both parts are RoHS3 compliant and share the DO-201AD package format.

Fast Recovery Substitutes (Equivalent Recovery Performance): EGP30J (onsemi) and FR305GP-AP (Micro Commercial Co) both feature fast recovery characteristics matching the STTH4L06RL. EGP30J maintains 75 ns reverse recovery time identical to the original part but is rated at 3 A current capacity and carries "Not For New Designs" status. FR305GP-AP is rated at 3 A with 250 ns reverse recovery time and active product status. Both are RoHS3 compliant and use DO-201AD packaging.

Standard Recovery Substitutes (Functional Alternatives): The 1N5406 series (available from Comchip Technology, Taiwan Semiconductor Corporation, and Micro Commercial Co) provides 600 V / 3 A ratings with standard recovery characteristics. These parts feature lower forward voltage (1.0 V to 1.1 V @ 3 A) and are widely available in active production. Standard recovery operation differs from the fast recovery profile of the STTH4L06RL and affects switching transient behavior. Multiple packaging options (Tape & Box, Cut Tape, Tape & Reel) are available.

Higher Current Capacity Substitutes: 60S6-TP (Micro Commercial Co, 6 A) and 10A05GP-TP (Micro Commercial Co, 10 A) provide increased current capacity at 600 V rating. These parts accommodate applications requiring higher current margins. 60S6-TP maintains DO-201AD packaging with standard recovery characteristics. 10A05GP-TP uses R-6 package format, requiring mechanical board layout verification.

Compliance Considerations: All recommended substitutes maintain RoHS3 compliance and REACH unaffected status. Parts marked "Not For New Designs" (1N5406RLG, EGP30J) are acceptable for legacy system support and repair applications but should not be selected for new product development.

Frequently Asked Questions (FAQ)

Q: Can STTH4L06 (Cut Tape) directly replace STTH4L06RL (Tape & Reel)? A: Yes. STTH4L06 and STTH4L06RL are parametrically identical. The difference is packaging format: Cut Tape versus Tape & Reel. Both parts have identical electrical specifications, reverse recovery time, forward voltage, and current ratings. Packaging selection depends on assembly process requirements and component handling procedures.

Q: What is the difference between fast recovery and standard recovery diodes? A: Fast recovery diodes (≤ 500ns reverse recovery time) switch off more quickly than standard recovery diodes (> 500ns). The STTH4L06RL features 75 ns fast recovery. Standard recovery substitutes like the 1N5406 series have slower switching characteristics, which may affect circuit performance in high-frequency applications or switching power supplies. Standard recovery diodes typically exhibit lower forward voltage drop.

Q: Can I use a 3 A rated diode in place of the 4 A STTH4L06RL? A: Current rating substitution depends on application requirements. If the circuit operates at or below 3 A average rectified current, a 3 A rated diode is acceptable. If the circuit requires the full 4 A capacity, a 3 A substitute will operate at or near its maximum rating, reducing design margin and potentially shortening component life. Higher-rated substitutes (6 A, 10 A) provide additional margin.

Q: Are all listed substitutes compatible with the DO-201AD package footprint? A: Most substitutes use DO-201AD or equivalent axial through-hole packages. Exception: 10A05GP-TP uses R-6 package format, which has different lead spacing and requires board layout verification. All other listed parts maintain DO-201AD compatibility for direct board-level substitution.

Q: Why is EGP30J marked "Not For New Designs" if it has fast recovery characteristics? A: Product status reflects manufacturer recommendations for new product development. "Not For New Designs" indicates the part is in mature or declining production phase. EGP30J remains available for legacy system support and repair applications. For new designs, active-status alternatives like FR305GP-AP or STTH4L06 are preferred.

Q: What is the impact of forward voltage differences between substitutes? A: Forward voltage affects power dissipation in the diode. STTH4L06RL specifies 1.3 V @ 3 A. Substitutes range from 1.0 V (1N5406 series) to 1.7 V (EGP30J). Lower forward voltage reduces heat generation; higher forward voltage increases dissipation. In high-current or high-frequency applications, forward voltage differences may require thermal design review.

Q: Can I use 1N5406RLG as a direct replacement? A: 1N5406RLG provides 600 V / 3 A ratings with standard recovery characteristics and is mechanically compatible. However, it is marked "Not For New Designs" and has higher reverse leakage current (10 µA versus 3 µA). It is acceptable for legacy system repair but not recommended for new applications. Active-status alternatives are preferred.

Q: What does RoHS3 compliance mean for this application? A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the component does not contain restricted substances including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers. All listed substitutes maintain RoHS3 compliance, ensuring compatibility with modern manufacturing and environmental regulations.

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