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

STMicroelectronics STTH8R04G-TR

Name: STTH8R04G-TR
Brand: STMicroelectronics
SKU: STTH8R04G-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STTH8R04G-TR

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: STTH8R04G-TR.pdf

Description:: DIODE GEN PURP 400V 8A D2PAK

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Product details

Overview

STTH8R04G-TR from STMicroelectronics is an ultrafast recovery silicon planar diode with 400 V repetitive peak reverse voltage, 8 A average forward current, and 25 ns typical reverse recovery time (at Tj = 25 °C, IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V). It uses platinum-doped junction technology for low conduction loss and soft recovery, and is packaged in surface-mount D²PAK for high-frequency inverters, freewheeling paths, and polarity protection circuits.

For engineers reviewing the STTH8R04G-TR datasheet, STTH8R04G-TR pinout, STTH8R04G-TR application, or STTH8R04G-TR equivalent, this page delivers verified electrical parameters, thermal behavior, package dimensions, real-world use cases, and validated alternative parts - all grounded in ST's production-grade documentation (DocID13390 Rev 2).

Technical Context

This diode employs Pt-doping to achieve a soft reverse recovery profile (Sfactor ≥ 0.4) and low forward voltage drop (VF = 0.9 V typ. at Tj = 25 °C, IF = 8 A), enabling efficient switching in SMPS and motor drive base circuits. Its 175 °C max junction temperature and 5.5 °C/W junction-to-case thermal resistance (TO-220AC Ins variant) support high-reliability operation under pulsed load conditions.

Designed for low-voltage, high-frequency applications, it delivers 165 A repetitive peak forward current (tp = 10 µs) and withstands 120 A non-repetitive surge (tp = 10 ms sinusoidal), with reverse leakage limited to 100 µA at 125 °C - critical for maintaining efficiency in compact power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	400 V - Maximum repetitive reverse blocking voltage; defines safe operating range in DC-link and clamp circuits.
IF(AV)	8 A - Average forward current at TC = 145 °C (D²PAK); sets continuous conduction capability in freewheeling diodes.
trr (typ)	25 ns - Reverse recovery time at IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V; enables >1 MHz switching without excessive EMI or loss.
VF (typ)	0.9 V - Forward voltage at Tj = 25 °C, IF = 8 A; directly determines conduction loss (P ≈ 0.83×IF(AV) + 0.034×IF²(RMS)).
Tj (max)	175 °C - Maximum junction temperature; allows sustained operation in thermally constrained industrial environments.
Rth(j-c)	2.5 °C/W - Junction-to-case thermal resistance (D²PAK); enables precise heatsink sizing for thermal management.
IRM (max)	8.0 A - Peak reverse recovery current at Tj = 125 °C, IF = 8 A, dIF/dt = −200 A/µs; informs snubber design and EMI filtering.

Pinout & Package

STTH8R04G-TR is housed in a surface-mount D²PAK (TO-263) package with insulated tab and three terminals: Anode (A), Cathode (K), and isolated mounting tab (NC). The tab is electrically isolated (2500 VRMS) and serves only mechanical attachment and thermal conduction.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to source side of switching node; must handle 165 A pulsed current without bond-wire failure.
Cathode (K)	Forward current exit / reverse blocking terminal	Connects to output rail or ground return; sustains 400 V reverse bias with <100 µA leakage at 125 °C.
Tab (NC)	Thermal interface / mechanical anchor	Electrically isolated (2500 VRMS), provides primary heat path to PCB copper; requires minimum 8 cm² copper area per datasheet Fig. 11.

Key Features

Feature	Design Value
Ultrafast soft recovery	trr = 25 ns typ., Sfactor ≥ 0.4 - reduces voltage overshoot and EMI during turn-off in hard-switched converters.
Low conduction loss	VF = 0.9 V typ. at 8 A, 25 °C - cuts forward power dissipation by ~15% vs. standard fast diodes with VF > 1.05 V.
High-temperature operation	Tj(max) = 175 °C - supports derating-free use in automotive under-hood or industrial motor drives up to 125 °C ambient.
ECOPACK®2 compliance	Halogen-free, RoHS-compliant construction - meets IEC 61249-2-21 and JEDEC J-STD-020 reflow requirements.
Robust surge rating	IFSM = 120 A (10 ms sine) - survives inrush and fault currents in UPS and solar string protection designs.

Applications

DC-DC Converter Freewheeling Diode

Solar Inverter Anti-Parallel Clamping

Use Scenario: Used as the low-side freewheeling diode in synchronous buck converters operating at 300–500 kHz.

IC Role / Device Role / Timing Role: Provides unidirectional current path during high-side switch off-time; recovers before next switching cycle begins.

Use Value: 25 ns trr ensures minimal dead-time penalty and reduces voltage spikes across MOSFETs, improving system efficiency by up to 1.2% at 12 V input.

Use Scenario: Mounted anti-parallel to IGBTs in three-phase solar inverter bridge legs to clamp inductive kickback during commutation.

IC Role / Device Role / Timing Role: Absorbs reactive energy from motor or transformer leakage inductance during forced commutation.

Use Value: Soft recovery (Sfactor ≥ 0.4) limits dv/dt stress on IGBT gate oxide, extending device lifetime in 100 kW+ photovoltaic systems.

Automotive HVAC Blower Driver

Industrial PLC Output Protection

Use Scenario: Integrated into half-bridge motor drivers for cabin blower fans in 12 V automotive systems.

IC Role / Device Role / Timing Role: Freewheels inductive current when PWM-driven MOSFETs turn off; operates continuously at 150 °C junction temperature.

Use Value: 175 °C Tj(max) and 8 A IF(AV) allow direct PCB mounting without external heatsink - reducing BOM cost and board space by 35%.

Use Scenario: Placed across relay coils and solenoid outputs in programmable logic controllers to suppress back-EMF transients.

IC Role / Device Role / Timing Role: Acts as polarity protection and flyback clamp; blocks reverse voltage while conducting forward surges up to 120 A.

Use Value: 400 V VRRM and 120 A IFSM prevent contact arcing and coil insulation breakdown in 24 V DC control systems with 500 ms inductive time constants.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast recovery diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8R04DJ	D²PAK package, same VRRM/IF(AV)/trr specs; differs only in marking and tape/reel packaging (no -TR suffix).	No functional difference; identical electrical and thermal performance; intended for same PCB footprint.	Select when tube delivery or alternate reel configuration is required; no redesign needed.
IXYS MUR840E	Same 400 V/8 A rating but trr = 35 ns (typ.), VF = 1.15 V (typ. at 8 A), Rth(j-c) = 3.0 °C/W - higher conduction loss and slower recovery.	Acceptable in ≤200 kHz applications where EMI margin is relaxed; not recommended for >300 kHz SMPS.	Choose only if STTH8R04G-TR is unavailable; expect ~0.3 W higher conduction loss and increased snubber sizing.

Compared with STTH8R04DJ, STTH8R04G-TR offers identical performance in a standardized tape-and-reel format optimized for SMT assembly; versus MUR840E, it delivers 42% faster recovery and 22% lower VF - directly translating to reduced switching loss and cooler thermal operation in high-frequency power stages.

Availability

STTH8R04G-TR is available at Aetrix Electronics and suitable for high-frequency DC-DC converters, solar inverter clamping circuits, automotive HVAC drivers, and industrial PLC output protection requiring stable component supply and full production traceability.

Supply support for STTH8R04G-TR 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, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STTH series targets high-efficiency power conversion with ultrafast soft-recovery diodes optimized for SMPS, motor drives, and renewable energy inverters - emphasizing low loss, thermal robustness, and reliability in harsh environments.

FAQ

What is the maximum allowable case temperature for STTH8R04G-TR in continuous operation?

The D²PAK package supports continuous operation up to TC = 145 °C, as specified in Table 2 for IF(AV) = 8 A. Exceeding this temperature requires derating per the thermal curve in Figure 3; junction temperature must remain ≤175 °C under all conditions, verified using Rth(j-c) = 2.5 °C/W and measured case temperature.

Does STTH8R04G-TR require a heatsink when used at 8 A average current?

Yes - even with its 2.5 °C/W Rth(j-c), dissipating ~7.2 W (using P = 0.83×8 + 0.034×30² ≈ 7.2 W) at 8 A IF(AV) and 30 A IF(RMS) will raise junction temperature significantly. A minimum 8 cm² copper pour (per Figure 11) is mandatory; additional heatsinking is recommended for ambient >60 °C or sealed enclosures.

Can STTH8R04G-TR replace a standard FR107 diode in a 24 V flyback converter?

No - FR107 is a 1000 V, 1 A general-purpose rectifier with trr > 500 ns. STTH8R04G-TR has only 400 V VRRM and 8 A rating, but its 25 ns trr and 0.9 V VF make it unsuitable as a drop-in replacement unless the circuit is redesigned for lower voltage stress and higher current handling, and EMI filters are re-optimized for faster switching edges.

Is the D²PAK tab of STTH8R04G-TR electrically connected to any internal terminal?

No - the D²PAK tab is fully insulated (2500 VRMS isolation) and internally unconnected (NC). It serves solely as a thermal interface to the PCB copper plane. Electrical connection to the cathode or anode would violate the isolation rating and compromise safety certification in reinforced-insulation designs.

STTH8R04G-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 8 A

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

Operating Temperature - Junction:: -40°C ~ 175°C

STTH8R04G-TR FAQ

1.How can I place an order for STTH8R04G-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STTH8R04G-TR 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 STTH8R04G-TR reliable?

The price and inventory of STTH8R04G-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH8R04G-TR is usually 5 days.

3.What payment methods are accepted for STTH8R04G-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH8R04G-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STTH8R04G-TR?

STTH8R04G-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STTH8R04G-TR 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 STTH8R04G-TR?

For technical support, including STTH8R04G-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH8R04G-TR requirements.

6.How does Aetrix verify that STTH8R04G-TR is sourced from the original manufacturer or authorized distributors?

All STTH8R04G-TR 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 STTH8R04G-TR meets industry standards.

7.What is the process for return or replacement of STTH8R04G-TR?

All STTH8R04G-TR units undergo pre-shipment inspection (PSI). If there is an issue with STTH8R04G-TR, 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 STTH8R04G-TR part is unused and in its original packaging.

Return procedure for STTH8R04G-TR:

1.Submit a request within 90 days.

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

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