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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics STTH8L06DIRG

Name: STTH8L06DIRG
Brand: STMicroelectronics
SKU: STTH8L06DIRG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH8L06DIRG

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-220-2 Insulated, TO-220AC

Datasheet:: STTH8L06DIRG.pdf

Description:: DIODE GP 600V 8A TO220AC INS

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Product details

Overview

STTH8L06DIRG from STMicroelectronics is a 600 V, 8 A ultrafast high-voltage rectifier diode in an insulated TO-220AC package with 2500 V_rms insulation rating, 75 ns typical reverse recovery time, and 0.85 V typical forward voltage at 150 °C - optimized as a boost diode in discontinuous/critical-mode PFC circuits and as a freewheeling diode in industrial switch-mode power supplies.

For engineers reviewing the STTH8L06DIRG datasheet, STTH8L06DIRG pinout, STTH8L06DIRG application, or STTH8L06DIRG equivalent, this page delivers verified thermal resistance (4 °C/W junction-to-case), reverse leakage (≤200 µA at 150 °C), softness factor data, conduction loss equation, and insulation-rated package details critical for high-reliability AC/DC front-end design.

Technical Context

The STTH8L06DIRG employs ST's Turbo 2 silicon technology to achieve ultrafast switching with low reverse recovery current (7.2–10 A IRM at 125 °C) and soft recovery characteristics (S factor ≥1.0 at dIF/dt = 100 A/µs). Its 175 °C maximum junction temperature and low thermal resistance support sustained operation under high ambient conditions.

Designed specifically for power factor correction stages, it delivers stable conduction losses via a quadratic model (P = 0.89 × I_F(AV) + 0.022 × I_F(RMS)²) and maintains low VF drift across temperature (0.85 V typ. at 150 °C, 1.05 V max.), enabling predictable thermal management in compact 85–265 VAC input designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	600 V - supports universal AC input rectification up to 400 VDC bus with margin for transient overvoltage
I_F(AV)	8 A at T_c = 135 °C - defines continuous DC output current capability when mounted on heatsink
t_rr (typ)	75 ns - enables high-frequency (>100 kHz) PFC operation with minimal switching loss and EMI
R_th(j-c)	4 °C/W - allows precise junction temperature estimation using case temperature measurement
V_F (typ)	0.85 V at 150 °C / 8 A - reduces conduction loss by ~15% vs. standard fast diodes at elevated temperature
I_R (max)	200 µA at 150 °C - ensures low standby power loss and stable blocking in high-temperature environments
Package	TO-220AC Insulated - provides 2500 V_rms isolation between tab and leads for reinforced safety in Class I equipment

Pinout & Package

TO-220AC Insulated package with electrically isolated metal tab rated for 2500 V_rms insulation; mounting screw torque: 0.4–0.6 N·m; epoxy meets UL94 V0.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current entry point	Connected to switching node (e.g., PFC boost switch drain) - carries full load current during conduction
Cathode (Lead 2)	Output current exit point	Connected to output capacitor/bus - sustains reverse voltage during off-state; low VF minimizes drop
Isolated Tab	Thermal path only	Electrically isolated metal surface for heatsink attachment - no electrical connection to either terminal

Key Features

Feature	Design Value
Ultrafast recovery (75 ns typ.)	Enables >100 kHz PFC operation while limiting diode turn-off loss and dv/dt-induced EMI
Soft recovery (S factor ≥1.0)	Reduces voltage overshoot and ringing during commutation, easing snubber design and improving system reliability
Low thermal resistance (4 °C/W)	Permits direct thermal coupling to heatsink without insulating pads, simplifying mechanical layout and lowering θ_ja
High insulation rating (2500 V_rms)	Meets reinforced insulation requirements for Class I AC/DC converters without additional creepage/clearance barriers
175 °C max junction temperature	Supports operation in sealed enclosures or high-ambient environments (e.g., industrial DIN-rail PSUs)

Applications

Server PSU PFC Stage

Industrial AC/DC Adapter

Use Scenario: Discontinuous conduction mode (DCM) boost PFC in 1–3 kW server power supplies operating at 100–300 kHz.

IC Role / Device Role / Timing Role: Boost rectifier diode - conducts during MOSFET off-time to charge output capacitor and shape input current waveform.

Use Value: 75 ns t_rr and soft recovery minimize switching loss and EMI generation, reducing need for complex filtering and improving efficiency above 96%.

Use Scenario: Freewheeling diode in flyback or LLC resonant converter outputs for factory automation controllers (24–48 VDC, 5–15 A).

IC Role / Device Role / Timing Role: Output rectifier - clamps transformer secondary during MOSFET on-time and conducts stored energy during off-time.

Use Value: 0.85 V V_F at 150 °C lowers conduction loss by ~0.5 W vs. standard fast diodes, directly improving thermal margin at full load.

Medical Power Supply Input Stage

Renewable Energy Inverter Auxiliary Supply

Use Scenario: Input rectification and PFC in Class I medical-grade 250–500 W AC/DC modules requiring reinforced insulation per IEC 60601-1.

IC Role / Device Role / Timing Role: Insulated boost diode - bridges AC line to DC bus while maintaining 2500 V_rms isolation between primary and heatsink ground.

Use Value: TO-220AC Insulated package eliminates need for isolating thermal pads or separate insulation layers, simplifying safety certification and reducing BOM count.

Use Scenario: Auxiliary bias supply rectifier in solar string inverters (800–1000 VDC input) where ambient temperatures exceed 70 °C.

IC Role / Device Role / Timing Role: High-voltage auxiliary rectifier - converts transformer output to stable 12–24 VDC for gate drivers and control ICs.

Use Value: 200 µA max reverse leakage at 150 °C prevents excessive standby current in high-temperature enclosures, preserving system efficiency during low-power states.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast high-voltage rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8R06D	Same die, non-insulated TO-220AC package (2500 V_rms not rated); R_th(j-c) = 2.5 °C/W	Requires external insulation for safety-critical systems; better thermal performance but higher layout risk	Select when heatsink is floating or isolation is handled elsewhere; avoid in Class I mains-connected designs
IXYS MUR860E	600 V, 8 A, 75 ns t_rr, but higher V_F (1.7 V typ. at 25 °C) and no published softness data	Higher conduction loss at high temperature; less predictable EMI behavior in high-dv/dt PFC stages	Acceptable for cost-sensitive industrial adapters where efficiency >94% is not required

Compared with STTH8R06D, STTH8L06DIRG trades 1.5 °C/W higher thermal resistance for guaranteed 2500 V_rms isolation - essential for certified medical/industrial AC/DC. Versus MUR860E, it offers lower VF at temperature and documented soft recovery, enabling cleaner PFC waveforms and reduced snubber stress.

Availability

STTH8L06DIRG is available at Aetrix Electronics and suitable for server power supply PFC stages, industrial AC/DC adapters, and medical-grade auxiliary supplies requiring stable component supply, long-term lifecycle support, and certified insulation performance.

Supply support for STTH8L06DIRG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, analog ICs, and sensors for industrial, automotive, and consumer markets.

The STTH series belongs to ST's high-voltage rectifier product line, engineered specifically for high-efficiency, high-reliability AC/DC conversion in power factor correction and switching power supply applications.

FAQ

What is the maximum recommended heatsink temperature for STTH8L06DIRG?

The device specifies I_F(AV) = 8 A at T_c = 135 °C, meaning the case (tab) temperature must not exceed 135 °C under continuous operation. With R_th(j-c) = 4 °C/W and T_j(max) = 175 °C, the junction will remain within limit if heatsink temperature stays ≤135 °C - verified via thermal interface material and fin design per Figure 13 in the datasheet.

Does STTH8L06DIRG require a thermal pad or insulator when mounted to a grounded heatsink?

No - the TO-220AC Insulated package features a fully isolated metal tab rated for 2500 V_rms between tab and leads. It may be directly bolted to a grounded heatsink without additional insulation, satisfying reinforced insulation requirements per IEC 62368-1 and IEC 60601-1 without extra components.

How does the softness factor affect EMI in PFC circuits?

A softness factor ≥1.0 (measured at dIF/dt = 100 A/µs) indicates gradual current decay during reverse recovery, reducing high-frequency spectral content and peak dv/dt. This directly lowers common-mode noise and simplifies EMI filter design - confirmed by Figures 5–8 showing low IRM and stable Q_rr vs. dIF/dt in the datasheet.

Can STTH8L06DIRG replace STTH8L06G in D2PAK-based designs?

No - STTH8L06DIRG uses TO-220AC Insulated packaging with different footprint, thermal path, and mounting geometry versus the surface-mount D2PAK of STTH8L06G. While both share identical die characteristics, mechanical incompatibility and distinct R_th(j-c) values (4 °C/W vs. 2.5 °C/W) prevent direct substitution without board and thermal redesign.

STTH8L06DIRG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-2 Insulated, TO-220AC

Packaging:: Tube

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 600 V

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 8 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 105 ns

Current - Reverse Leakage @ Vr:: 8 µA @ 600 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AC ins

Operating Temperature - Junction:: 175°C (Max)

STTH8L06DIRG FAQ

1.How can I place an order for STTH8L06DIRG through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH8L06DIRG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STTH8L06DIRG reliable?

The price and inventory of STTH8L06DIRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH8L06DIRG is usually 5 days.

3.What payment methods are accepted for STTH8L06DIRG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH8L06DIRG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH8L06DIRG?

STTH8L06DIRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH8L06DIRG order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STTH8L06DIRG?

For technical support, including STTH8L06DIRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH8L06DIRG requirements.

6.How does Aetrix verify that STTH8L06DIRG is sourced from the original manufacturer or authorized distributors?

All STTH8L06DIRG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STTH8L06DIRG meets industry standards.

7.What is the process for return or replacement of STTH8L06DIRG?

All STTH8L06DIRG units undergo pre-shipment inspection (PSI). If there is an issue with STTH8L06DIRG, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STTH8L06DIRG part is unused and in its original packaging.

Return procedure for STTH8L06DIRG:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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