STTH8L06DIRG Equivalent & Substitute Parts

Part Overview

The STTH8L06DIRG is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 600 V DC reverse voltage and 8 A average rectified current in a TO-220AC insulated through-hole package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure supply chain reliability for applications requiring 600 V fast recovery rectification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 8 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	105	ns
Current - Reverse Leakage @ Vr	8	µA @ 600 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2 Insulated, TO-220AC	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STTH8L06DIRG is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 600 V to ensure electrical compatibility and safety margins in the application circuit.

Current Rating: The average rectified current (Io) of substitute parts must equal or exceed 8 A to support the same load conditions. Parts with lower current ratings (3 A, 6 A) are classified as partial substitutes suitable only for reduced-current applications.

Package and Mounting: All substitute parts utilize through-hole mounting in TO-220-2 or TO-220AC configurations, ensuring mechanical and thermal compatibility with existing PCB layouts and heatsinking arrangements.

Speed Classification: All substitute parts are classified as fast recovery diodes with reverse recovery time ≤ 500 ns, maintaining switching performance characteristics required for rectification applications.

Compliance: RoHS3 compliance is maintained across all substitute parts, ensuring regulatory alignment for modern manufacturing and end-use environments.

Substitute parts are grouped into two categories:

Full Current Substitutes (8 A or higher): BYV29X-600,127 (9 A) and SDUR860 (current rating not specified but forward voltage characteristics suggest 8 A class operation).

Partial Current Substitutes (lower current ratings): LXA06T600 (6 A) and QH03TZ600, LQA03TC600 (3 A each). These parts are suitable for applications where the required current does not exceed their rated values.

Parameter Comparison

Parameter	STTH8L06DIRG (Main)	BYV29X-600,127	LXA06T600	LQA03TC600	QH03TZ600	SDUR860
Manufacturer	STMicroelectronics	WeEn Semiconductors	Power Integrations	Power Integrations	Power Integrations	SMC Diode Solutions
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	8 A	9 A	6 A	3 A	3 A	—
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 8 A	1.26 V @ 8 A	2.94 V @ 6 A	3.1 V @ 3 A	3 V @ 3 A	1.7 V @ 8 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	105 ns	60 ns	23 ns	13 ns	9.8 ns	50 ns
Current - Reverse Leakage @ Vr	8 µA @ 600 V	50 µA @ 600 V	250 µA @ 600 V	20 µA @ 600 V	250 µA @ 600 V	5 µA @ 600 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2 Insulated, TO-220AC	TO-220-2 Full Pack, Isolated Tab	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction (Max)	175°C	150°C	150°C	150°C	150°C	150°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Full-Current Substitute: BYV29X-600,127

The BYV29X-600,127 manufactured by WeEn Semiconductors is the preferred full-current substitute for the STTH8L06DIRG. This part maintains the 600 V voltage rating and exceeds the 8 A current requirement at 9 A, providing operational margin. The forward voltage of 1.26 V @ 8 A is comparable to the main part at 1.3 V, and the reverse recovery time of 60 ns is superior to the main part's 105 ns. The part is ROHS3 compliant and currently in active production status with substantial inventory availability (9541 pcs). The TO-220FP package provides isolated tab configuration compatible with standard TO-220AC mounting arrangements. Note that REACH status is listed as affected, requiring verification of regulatory compliance for specific end-use applications.

Secondary Full-Current Substitute: SDUR860

The SDUR860 manufactured by SMC Diode Solutions is an alternative full-current substitute. This part maintains 600 V voltage rating and forward voltage of 1.7 V @ 8 A, with a reverse recovery time of 50 ns. The part is ROHS3 compliant and active in production. Reverse leakage current is 5 µA @ 600 V, which is lower than the main part. Operating temperature range extends to −55°C, providing broader thermal operating envelope. Current rating is not explicitly specified in available data but forward voltage characteristics indicate 8 A class operation. REACH status is listed as affected.

Partial-Current Substitutes: LXA06T600, LQA03TC600, QH03TZ600

These Power Integrations Qspeed™ series parts are suitable for applications where the required current does not exceed their respective ratings (6 A and 3 A). All three parts maintain 600 V voltage rating and fast recovery characteristics. These parts are active in production and RoHS compliant. LXA06T600 (6 A) is appropriate for applications requiring up to 6 A. LQA03TC600 and QH03TZ600 (both 3 A) are appropriate for applications requiring up to 3 A. All three parts have lower maximum junction temperatures (150°C) compared to the main part (175°C), which may impact thermal design margins in high-temperature environments.

Compliance and Regulatory Considerations

All substitute parts maintain RoHS compliance. The main part and BYV29X-600,127 and SDUR860 are ROHS3 compliant. Power Integrations parts (LXA06T600, LQA03TC600, QH03TZ600) are RoHS compliant. REACH status varies: the main part and Power Integrations parts are REACH unaffected, while BYV29X-600,127 and SDUR860 are REACH affected. Applications subject to REACH regulations require verification of substitute part compliance.

Frequently Asked Questions (FAQ)

Q: Can the BYV29X-600,127 be used as a direct replacement for the STTH8L06DIRG?

A: Yes, the BYV29X-600,127 is a direct full-current substitute. Both parts maintain 600 V voltage rating, support 8 A or higher current operation, utilize through-hole TO-220 mounting, and are classified as fast recovery diodes. The BYV29X-600,127 has superior reverse recovery time (60 ns vs. 105 ns) and comparable forward voltage characteristics. PCB layout and heatsinking arrangements designed for the STTH8L06DIRG are compatible with the BYV29X-600,127.

Q: What is the difference between the TO-220AC and TO-220FP packages?

A: Both TO-220AC and TO-220FP are through-hole TO-220-2 packages with isolated tabs suitable for heatsinking. The primary difference is in tab isolation configuration. TO-220AC (insulated) and TO-220FP (full pack, isolated tab) are mechanically and thermally compatible for standard PCB mounting and heatsink attachment. Electrical performance and pin assignments are equivalent.

Q: Can LXA06T600 or the 3 A parts replace the STTH8L06DIRG in all applications?

A: No. LXA06T600 is rated for 6 A maximum, and LQA03TC600 and QH03TZ600 are rated for 3 A maximum. These parts are suitable only for applications where the required average rectified current does not exceed their respective ratings. Using an undersized current-rated part in an 8 A application will result in thermal stress and potential component failure. These parts are classified as partial substitutes for reduced-current applications only.

Q: How do reverse recovery times affect circuit performance?

A: Reverse recovery time (trr) determines the speed at which a diode transitions from forward conduction to reverse blocking. The STTH8L06DIRG has a trr of 105 ns. Substitute parts have lower trr values: BYV29X-600,127 (60 ns), SDUR860 (50 ns), LXA06T600 (23 ns), LQA03TC600 (13 ns), and QH03TZ600 (9.8 ns). Lower trr values reduce switching losses and improve efficiency in high-frequency rectification circuits. Substitution with lower trr parts generally improves performance; substitution with higher trr parts would degrade performance.

Q: Are there thermal considerations when substituting the STTH8L06DIRG?

A: Yes. The STTH8L06DIRG has a maximum junction temperature of 175°C, while all substitute parts are rated for 150°C maximum. This 25°C difference may impact thermal design margins in applications operating near maximum temperature limits. Forward voltage characteristics also vary: the main part is 1.3 V @ 8 A, while substitutes range from 1.26 V to 3.1 V depending on current rating. Higher forward voltages result in increased power dissipation and heat generation. Thermal analysis is required to confirm that heatsinking arrangements designed for the main part are adequate for substitute parts with higher forward voltage.

Q: What is the significance of REACH and RoHS compliance status?

A: RoHS compliance indicates that the part does not contain restricted hazardous substances and is suitable for use in consumer electronics and regulated markets. ROHS3 is the current standard. REACH compliance status indicates whether the part is subject to European chemical regulations. The main part and Power Integrations parts are REACH unaffected. BYV29X-600,127 and SDUR860 are REACH affected, requiring additional regulatory verification for applications subject to REACH requirements. Selection of substitute parts must account for end-use regulatory requirements.

Q: Is the STTH8L06DIRG obsolete, and what does this mean for long-term supply?

A: Yes, the STTH8L06DIRG is classified as obsolete, indicating that STMicroelectronics has discontinued production. Current inventory is available (2400 pcs), but future procurement may be limited or unavailable. All substitute parts listed are in active production status with current inventory availability, ensuring long-term supply chain reliability. Transition to an active substitute part is recommended for new designs and ongoing production requirements.

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