STTH4L06QRL Equivalent & Substitute Parts

Part Overview

The STTH4L06QRL 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-15 through-hole package. This component is classified as obsolete, indicating that direct replacement with active production alternatives is necessary for new designs and ongoing procurement. The fast recovery characteristic (≤500 ns) and 75 ns reverse recovery time position this diode for applications requiring rapid switching performance in rectification circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	V
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	—
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	3	µA @ 600 V
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STTH4L06QRL 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 STTH4L06QRL is rated at 4 A; substitutes with lower current ratings (1 A, 1.5 A, 2 A) are suitable only for applications requiring reduced current capacity. Substitutes with higher current ratings (10 A) provide additional margin and are electrically compatible.

Recovery Characteristics: The STTH4L06QRL exhibits fast recovery (≤500 ns) with a 75 ns reverse recovery time. Substitutes are grouped into fast recovery (≤500 ns) and standard recovery (>500 ns) categories. Fast recovery diodes are directly interchangeable; standard recovery diodes may be used in applications where switching speed is not critical.

Package Compatibility: The DO-15 (DO-204AC) axial through-hole package is the primary form factor. Substitutes must use compatible through-hole packages to ensure mechanical fit and PCB assembly compatibility.

Forward Voltage: Forward voltage drop varies among substitutes (1.0 V to 1.7 V at rated current). Selection depends on circuit power dissipation requirements and voltage regulation tolerance.

Compliance Status: RoHS3 compliance is preferred for new designs. Active production status ensures long-term availability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	Recovery Type	trr [ns]	Package	Status	RoHS
STTH4L06QRL	STMicroelectronics	600	4	1.3 @ 3 A	Fast ≤500 ns	75	DO-15	Obsolete	ROHS3
10A05GP-TP	Micro Commercial Co	600	10	1.2 @ 10 A	Standard >500 ns	—	R-6	Active	—
1N3613	Microchip Technology	600	1	1.1 @ 1 A	Standard >500 ns	—	A, Axial	Active	Non-compliant
1N4247	Microchip Technology	600	1	1.3 @ 3 A	Standard >500 ns	5000	A, Axial	Active	Non-compliant
1N4946	Microchip Technology	600	1	1.3 @ 1 A	Fast ≤500 ns	250	A, Axial	Active	Non-compliant
1N5397GP-TP	Micro Commercial Co	600	1.5	1.4 @ 1.5 A	Standard >500 ns	—	DO-15	Active	ROHS3
1N5618	Microchip Technology	600	1	1.3 @ 3 A	Standard >500 ns	2000	A, Axial	Active	Non-compliant
1N5619	Microchip Technology	600	1	1.6 @ 3 A	Fast ≤500 ns	250	A, Axial	Active	Non-compliant
2A05GHB0G	Taiwan Semiconductor Corporation	600	2	1.0 @ 2 A	Standard >500 ns	—	DO-15	Active	ROHS3
EGP20J	Fairchild Semiconductor	600	2	1.7 @ 2 A	Fast ≤500 ns	75	DO-15	Active	—
FR155GP-AP	Micro Commercial Co	600	1.5	1.3 @ 1.5 A	Fast ≤500 ns	250	DO-15	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Same Current Rating):

No substitute part maintains the exact 4 A current rating of the STTH4L06QRL. The closest active alternatives are the 10A05GP-TP (10 A) and 2A05GHB0G (2 A). The 10A05GP-TP provides superior current capacity with identical 600 V voltage rating but uses an R-6 package instead of DO-15, requiring mechanical redesign. The 2A05GHB0G maintains DO-15 package compatibility and ROHS3 compliance but operates at half the current rating.

For Fast Recovery Applications:

The EGP20J (Fairchild Semiconductor) and FR155GP-AP (Micro Commercial Co) both provide fast recovery characteristics (≤500 ns) with 75 ns and 250 ns reverse recovery times respectively. Both are rated at 2 A in DO-15 packages. The EGP20J matches the 75 ns reverse recovery time of the STTH4L06QRL. The FR155GP-AP offers ROHS3 compliance and active production status.

For Standard Recovery Applications:

The 1N5397GP-TP (Micro Commercial Co) provides 1.5 A capacity in DO-15 package with ROHS3 compliance and active status. The 2A05GHB0G (Taiwan Semiconductor Corporation) offers 2 A capacity, ROHS3 compliance, and AEC-Q101 automotive qualification.

Compliance Considerations:

ROHS3-compliant alternatives include 1N5397GP-TP, 2A05GHB0G, and FR155GP-AP. These are preferred for new designs subject to environmental regulations. The EGP20J, while offering fast recovery performance, does not specify RoHS status.

Production Status:

All listed substitutes maintain active production status, ensuring long-term availability and supply chain stability compared to the obsolete STTH4L06QRL.

Frequently Asked Questions (FAQ)

Q: Can I use a 2 A diode as a substitute for the 4 A STTH4L06QRL?

A: A 2 A diode is suitable only if the application circuit requires less than 2 A average rectified current. The 2A05GHB0G and EGP20J both provide 2 A capacity at 600 V. If the application requires the full 4 A capacity, a higher-rated substitute such as the 10A05GP-TP (10 A) must be used.

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

A: Fast recovery diodes (≤500 ns) exhibit shorter reverse recovery time, enabling faster switching transitions. The STTH4L06QRL is a fast recovery device with 75 ns reverse recovery time. Standard recovery diodes (>500 ns) are suitable for lower-frequency rectification applications where switching speed is not critical. The EGP20J and FR155GP-AP provide fast recovery alternatives; the 1N5397GP-TP and 2A05GHB0G provide standard recovery alternatives.

Q: Is the DO-15 package essential for my application?

A: The DO-15 (DO-204AC) axial through-hole package is mechanically compatible with the STTH4L06QRL footprint. Substitutes using this package include 1N5397GP-TP, 2A05GHB0G, EGP20J, and FR155GP-AP. The 10A05GP-TP uses an R-6 package and requires PCB redesign. Axial packages (A) such as those used by 1N3613, 1N4247, 1N4946, 1N5618, and 1N5619 have different mechanical dimensions and are not directly interchangeable.

Q: Which substitute offers the best RoHS compliance?

A: The 1N5397GP-TP, 2A05GHB0G, and FR155GP-AP all carry ROHS3 compliance certification. These are recommended for applications subject to environmental regulations or customer requirements for lead-free components.

Q: What is the forward voltage drop difference between substitutes?

A: Forward voltage varies from 1.0 V (2A05GHB0G at 2 A) to 1.7 V (EGP20J at 2 A). Higher forward voltage results in increased power dissipation. For thermal-sensitive applications, the 2A05GHB0G offers the lowest forward voltage drop at its rated current.

Q: Can I use a 1 A diode in place of the 4 A STTH4L06QRL?

A: A 1 A diode is suitable only for applications requiring less than 1 A average rectified current. The 1N3613, 1N4247, 1N4946, 1N5618, and 1N5619 all provide 1 A capacity at 600 V. These are not suitable for applications requiring the full 4 A capacity of the STTH4L06QRL.

Q: What is the operating temperature range difference?

A: The STTH4L06QRL operates to 175°C maximum junction temperature. Most substitutes operate to 150°C or 175°C. The 1N5618 extends to 200°C maximum junction temperature, providing additional thermal margin for high-temperature applications.

Q: Are there any substitutes with higher current ratings than 4 A?

A: Yes, the 10A05GP-TP is rated at 10 A, providing 2.5 times the current capacity. This part uses an R-6 package instead of DO-15, requiring mechanical redesign. It is suitable for applications where increased current margin is required.

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