STTH4L06Q Equivalent & Substitute Parts

Part Overview

The STTH4L06Q 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 device features fast recovery characteristics with a reverse recovery time of 75 ns, making it suitable for applications requiring rapid switching performance. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

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 ≤ 500ns, > 200mA (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 STTH4L06Q is determined by the following critical parameters:

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

Current Rating: The average rectified current capacity must be equal to or greater than 4 A. Parts with lower current ratings (1 A, 1.5 A, 2 A) are not direct substitutes but may serve in applications with reduced current requirements.

Recovery Speed: The STTH4L06Q employs fast recovery characteristics (≤ 500 ns). Substitute parts with standard recovery (> 500 ns) exhibit different switching behavior and are classified as functional alternatives rather than direct equivalents.

Package Compatibility: The DO-15 through-hole package is the primary form factor. Axial package variants (A, Axial) are mechanically incompatible with DO-15 footprints.

Compliance Status: RoHS3 compliance and active product status are preferred for new designs, though non-compliant alternatives remain functionally viable.

Substitute parts are grouped into two categories: Direct Equivalents (matching 600 V, 4 A, fast recovery, DO-15 package) and Functional Alternatives (matching 600 V rating with reduced current capacity or different recovery characteristics).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Package	Status	RoHS
STTH4L06Q	STMicroelectronics	600 V	4 A	1.3 V @ 3 A	Fast Recovery ≤ 500ns	75 ns	DO-15	Obsolete	ROHS3
10A05GP-TP	Micro Commercial Co	600 V	10 A	1.2 V @ 10 A	Standard Recovery > 500ns	—	R-6	Active	—
1N3613	Microchip Technology	600 V	1 A	1.1 V @ 1 A	Standard Recovery > 500ns	—	Axial	Active	Non-compliant
1N4247	Microchip Technology	600 V	1 A	1.3 V @ 3 A	Standard Recovery > 500ns	5 µs	Axial	Active	Non-compliant
1N4946	Microchip Technology	600 V	1 A	1.3 V @ 1 A	Fast Recovery ≤ 500ns	250 ns	Axial	Active	Non-compliant
1N5397GP-TP	Micro Commercial Co	600 V	1.5 A	1.4 V @ 1.5 A	Standard Recovery > 500ns	—	DO-15	Active	ROHS3
1N5618	Microchip Technology	600 V	1 A	1.3 V @ 3 A	Standard Recovery > 500ns	2 µs	Axial	Active	Non-compliant
1N5619	Microchip Technology	600 V	1 A	1.6 V @ 3 A	Fast Recovery ≤ 500ns	250 ns	Axial	Active	Non-compliant
EGP20J	Fairchild Semiconductor	600 V	2 A	1.7 V @ 2 A	Fast Recovery ≤ 500ns	75 ns	DO-15	Active	—
FR155GP-AP	Micro Commercial Co	600 V	1.5 A	1.3 V @ 1.5 A	Fast Recovery ≤ 500ns	250 ns	DO-15	Active	ROHS3
FR155GP-TP	Micro Commercial Co	600 V	1.5 A	1.3 V @ 1.5 A	Fast Recovery ≤ 500ns	250 ns	DO-15	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Matching 600 V, 4 A, Fast Recovery, DO-15):

No active substitute parts with identical electrical and mechanical specifications are available. The STTH4L06Q combines 4 A current capacity with fast recovery (75 ns) in a DO-15 package. The 10A05GP-TP exceeds current requirements but uses a different package (R-6) and standard recovery characteristics.

For Functional Alternatives with DO-15 Package Compatibility:

The EGP20J (Fairchild Semiconductor) provides the closest functional match among active parts. It maintains 600 V reverse voltage, fast recovery characteristics (75 ns), and DO-15 package form factor. Current capacity is 2 A, suitable for applications with reduced current demands. The part is active and available in high inventory.

The FR155GP-TP and FR155GP-AP (Micro Commercial Co) offer 600 V, 1.5 A, fast recovery (250 ns), and DO-15 packaging with ROHS3 compliance. These parts are active and suitable for lower-current applications.

The 1N5397GP-TP (Micro Commercial Co) provides 600 V, 1.5 A in DO-15 package with ROHS3 compliance, though it employs standard recovery characteristics.

For Axial Package Alternatives:

The 1N4946 (Microchip Technology) delivers 600 V, fast recovery (250 ns), and active status, but is limited to 1 A current and uses an axial package incompatible with DO-15 footprints.

The 1N5619 (Microchip Technology) offers 600 V, 1 A, fast recovery (250 ns), and active status in axial package.

Compliance Considerations:

ROHS3-compliant alternatives include EGP20J (status unspecified), FR155GP-TP, FR155GP-AP, and 1N5397GP-TP. Non-compliant but active alternatives include all Microchip Technology 1N-series parts and the 10A05GP-TP.

Frequently Asked Questions (FAQ)

Q: Can the EGP20J directly replace the STTH4L06Q?

A: The EGP20J is functionally compatible for applications tolerating 2 A current (versus 4 A). Both parts share 600 V reverse voltage, fast recovery characteristics (75 ns), and DO-15 package. Circuit current requirements must not exceed 2 A.

Q: Why are axial package diodes (1N4946, 1N5619) listed as alternatives?

A: These parts match the 600 V voltage rating and fast recovery speed but use axial (A) packages instead of DO-15. They are not mechanically compatible with DO-15 footprints and require circuit board redesign or adapter solutions.

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

A: Fast recovery diodes (≤ 500 ns) switch off more rapidly, reducing switching losses and electromagnetic interference. Standard recovery diodes (> 500 ns) exhibit slower switching behavior. The STTH4L06Q uses fast recovery (75 ns). Substituting with standard recovery parts alters circuit performance characteristics.

Q: Is the 10A05GP-TP a suitable replacement?

A: The 10A05GP-TP exceeds current requirements (10 A versus 4 A) and maintains 600 V rating, but uses an R-6 package instead of DO-15, making it mechanically incompatible. Standard recovery characteristics also differ from the original fast recovery design.

Q: Which substitute offers the best compliance profile?

A: The FR155GP-TP and FR155GP-AP both provide ROHS3 compliance, active product status, 600 V rating, fast recovery characteristics, and DO-15 packaging. Current capacity is 1.5 A, suitable for reduced-current applications.

Q: Can lower-current alternatives (1 A, 1.5 A) be used in a 4 A circuit?

A: No. Using a diode rated below the circuit's actual current demand causes excessive heat generation, accelerated aging, and potential failure. Current rating must equal or exceed circuit requirements.

Q: What is the significance of reverse recovery time (trr)?

A: Reverse recovery time determines how quickly the diode transitions from conducting to blocking state. The STTH4L06Q (75 ns) and EGP20J (75 ns) are fast. The 1N4946 (250 ns) and FR155 series (250 ns) are slower. Faster recovery reduces switching losses in high-frequency applications.

Q: Are there any 4 A alternatives in active production?

A: No active substitute parts with 4 A current capacity, 600 V rating, fast recovery, and DO-15 package are available. The 10A05GP-TP provides higher current but uses a different package.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message