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STMicroelectronics STTH803G-TR
- Part No.:
- STTH803G-TR
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
STTH803G-TR.pdf
- Description:
- DIODE GEN PURP 300V 8A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,722
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Product details
Overview
STTH803G-TR from STMicroelectronics is a single ultra-fast soft-recovery epitaxial rectifier diode optimized for secondary-side rectification in high-frequency switch-mode power supplies and DC/DC converters, with 300 V repetitive peak reverse voltage, 8 A average forward current, 25 ns maximum reverse recovery time, 0.85 V typical forward voltage at 125 °C, and D²PAK (TO-263) package.
For engineers reviewing the STTH803G-TR datasheet, STTH803G-TR pinout, STTH803G-TR application, or STTH803G-TR equivalent, this device is selected for low-noise, high-efficiency secondary rectification where fast soft recovery minimizes EMI and switching losses in 100–500 kHz SMPS topologies.
Technical Context
This diode employs an epitaxial construction enabling ultra-fast reverse recovery (trr ≤ 25 ns at 25 °C) with softness factor ≥ 0.3, reducing voltage overshoot and ringing during turn-off. Its 300 V VRRM rating supports wide-input universal AC/DC adapters and telecom offline converters.
Thermal resistance of 2.5 °C/W (junction-to-case) enables high-power operation up to 175 °C junction temperature when mounted on adequately sized copper heatsinks via the D²PAK's exposed drain pad, supporting continuous 8 A conduction with minimal thermal derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Withstands peak reverse voltages in 24–48 V output, 380 V bus SMPS designs without breakdown |
| IF(AV) | 8 A - Sustains continuous DC output current in 100–200 W secondary rectifiers |
| trr (max) | 25 ns - Enables clean turn-off below 500 kHz switching, minimizing snubber losses |
| VF (typ @ 125 °C) | 0.85 V - Reduces conduction loss to ~0.68 W at 8 A, improving efficiency over silicon standard recovery diodes |
| Rth(j-c) | 2.5 °C/W - Allows direct thermal path to heatsink; 20 °C rise at 8 A enables stable operation without forced air |
| Sfactor (min) | 0.3 - Ensures soft recovery waveform, suppressing EMI generation in noise-sensitive applications |
Pinout & Package
D²PAK (TO-263) surface-mount package with isolated tab (cathode-connected), designed for high-current PCB mounting and thermal conduction through the large exposed metal pad. Mechanical dimensions per ST DocID5375 Rev 10, Table 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward current flow | Connected to transformer secondary winding or switching node; carries full load current during conduction |
| Cathode | Output terminal; tied to exposed metal tab | Electrically and thermally connected to PCB copper pour; serves as main heat dissipation path and output return |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast soft recovery | trr ≤ 25 ns with Sfactor ≥ 0.3 - suppresses voltage spikes and EMI in high-dV/dt environments |
| High junction temperature rating | Tj(max) = 175 °C - supports operation in compact, sealed, or high-ambient industrial power supplies |
| Low forward voltage | VF = 0.85 V (typ @ 125 °C, 8 A) - reduces conduction loss by ~30% vs. standard FRD counterparts |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant materials - meets environmental requirements for consumer and industrial end equipment |
Applications
| AC/DC Adapter Secondary Rectification | Telecom DC/DC Converter Output Stage |
|---|---|
Use Scenario: 12–24 V, 50–100 W offline adapter with 100–300 kHz flyback topology. IC Role / Device Role / Timing Role: Fast-recovery rectifier on secondary side; replaces slower standard recovery diodes to reduce switching loss and EMI. Use Value: 25 ns trr enables >90% efficiency at full load while meeting CISPR-22 Class B conducted emissions limits. | Use Scenario: 48 V input, 3.3–12 V output telecom brick with synchronous or quasi-resonant forward converter. IC Role / Device Role / Timing Role: High-reliability secondary-side freewheeling/rectifying diode handling 8 A continuous output current. Use Value: 175 °C Tj rating and 2.5 °C/W Rth(j-c) allow operation at 70 °C ambient without derating in confined chassis. |
| Server PSU OR-ing Diode | Industrial PLC Power Module |
Use Scenario: N+1 redundant 12 V/20 A server power supply with hot-swap capability. IC Role / Device Role / Timing Role: OR-ing diode providing reverse-current blocking and fault isolation between parallel PSUs. Use Value: Low VF (0.85 V) minimizes voltage drop and heat generation during normal operation; soft recovery prevents transient coupling during switchover. | Use Scenario: DIN-rail mounted 24 V DC power module for programmable logic controllers with extended temperature range. IC Role / Device Role / Timing Role: Primary secondary rectifier in isolated DC/DC stage powering I/O and CPU rails. Use Value: ECOPACK®2 compliance ensures long-term reliability in harsh industrial environments; TO-263 footprint supports automated reflow assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R03DJ-TR | D²PAK package, same VRRM/trr/VF specs, but rated for 8 A RMS (vs. 8 A avg); slightly higher IR at 125 °C (200 µA max) | Optimized for higher RMS current handling in resonant converters with high peak-to-average ratio | Select when designing LLC or phase-shifted full-bridge topologies with high di/dt stress |
| IXYS MUR830E | TO-220AC package, 300 V VRRM, 8 A IF(AV), trr = 35 ns (max), VF = 0.92 V (typ @ 125 °C) | Through-hole mounting; higher trr increases switching loss in >200 kHz designs | Choose for legacy through-hole production or lower-cost prototyping where EMI margin permits longer trr |
Compared with STTH8R03DJ-TR and IXYS MUR830E, STTH803G-TR offers superior softness (Sfactor ≥ 0.3) and lower VF at elevated temperature-critical for high-density, high-frequency SMPS where thermal management and EMI control are constrained.
Availability
STTH803G-TR is available at Aetrix Electronics and suitable for AC/DC adapters, telecom DC/DC converters, server OR-ing circuits, and industrial PLC power modules requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for STTH803G-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, delivering intelligent power, analog, MEMS, and microcontroller solutions across automotive, industrial, and consumer markets.
STTH803G-TR belongs to ST's high-frequency rectifier product line, engineered specifically for low-loss, low-EMI secondary-side rectification in modern switch-mode power conversion systems operating above 100 kHz.
FAQ
What is the maximum junction temperature and how does it affect thermal design?
The STTH803G-TR has a maximum junction temperature of 175 °C. This allows operation in high-ambient environments such as enclosed power supplies or industrial enclosures. With a junction-to-case thermal resistance of 2.5 °C/W, a 20 °C temperature rise occurs at 8 A, meaning a heatsink or PCB copper area capable of dissipating ~20 W is required to maintain safe operation under full load at 70 °C ambient.
Is STTH803G-TR pin-compatible with other D²PAK rectifiers like STTH1203CI?
No-STTH803G-TR has a 2-pin D²PAK configuration (anode/cathode), while STTH1203CI is a 3-pin device with separate cathode and sense terminals. The pinout differs fundamentally: STTH803G-TR uses the exposed tab solely as cathode, whereas STTH1203CI adds a Kelvin sense connection. Direct replacement requires board layout revision.
Does STTH803G-TR require a snubber circuit in typical 200 kHz flyback designs?
In most 200 kHz flyback converters with proper transformer design and layout, STTH803G-TR's soft recovery (Sfactor ≥ 0.3) and 25 ns trr eliminate the need for external RC snubbers. Measured voltage overshoot remains below 10% of VRRM under standard test conditions (IF = 0.5 A, dIF/dt = –50 A/µs), reducing component count and board space.
How does the ECOPACK®2 compliance impact manufacturing and reliability?
ECOPACK®2 compliance means STTH803G-TR uses halogen-free molding compounds and lead-free terminations meeting RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3 (MSL3). This ensures compatibility with lead-free reflow profiles, eliminates corrosive halogen residues in humid environments, and supports long-term field reliability in consumer and industrial applications without compromising thermal or electrical performance.
STTH803G-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):
- 300 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 20 µA @ 300 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
- Operating Temperature - Junction:
- 175°C (Max)
STTH803G-TR FAQ
1.How can I place an order for STTH803G-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STTH803G-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 STTH803G-TR reliable?
The price and inventory of STTH803G-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH803G-TR is usually 5 days.
3.What payment methods are accepted for STTH803G-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH803G-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STTH803G-TR?
STTH803G-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STTH803G-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 STTH803G-TR?
For technical support, including STTH803G-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH803G-TR requirements.
6.How does Aetrix verify that STTH803G-TR is sourced from the original manufacturer or authorized distributors?
All STTH803G-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 STTH803G-TR meets industry standards.
7.What is the process for return or replacement of STTH803G-TR?
All STTH803G-TR units undergo pre-shipment inspection (PSI). If there is an issue with STTH803G-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 STTH803G-TR part is unused and in its original packaging.
Return procedure for STTH803G-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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