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STMicroelectronics STTH310
- Part No.:
- STTH310
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
STTH310.pdf
- Description:
- DIODE GEN PURP 1KV 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:2,178
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Product details
Overview
STTH310 from STMicroelectronics is an ultrafast high-voltage planar silicon rectifier diode rated for 1000 V repetitive peak reverse voltage and 3 A average forward current, with typical forward voltage drop of 0.98 V at 150 °C and maximum reverse recovery time of 75 ns. It serves as a free-wheeling, clamping, or snubber diode in switched-mode power supplies, PFC stages, and auxiliary power rails.
For engineers reviewing the STTH310 datasheet, STTH310 pinout, STTH310 application, or STTH310 equivalent, key selection criteria include its soft-switching behavior (reduced EMI), surge current capability (55 A non-repetitive), thermal resistance (20 °C/W junction-to-lead), and ECOPACK2 compliance for environmentally constrained designs.
Technical Context
The STTH310 employs planar epitaxial construction to achieve controlled carrier lifetime and soft reverse recovery characteristics-critical for minimizing voltage overshoot and EMI in high-frequency switching topologies. Its 75 ns trr and low Qrr support operation up to several hundred kHz in flyback, forward, and resonant converters.
Thermal design is enabled by two package options: DO-201AD (1.16 g, leaded) and SMC (0.245 g, surface-mount), both offering 20 °C/W junction-to-lead thermal resistance under standard mounting conditions and rated for 175 °C maximum junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - supports primary-side rectification in universal-input offline SMPS without derating |
| IF(AV) | 3 A - continuous conduction mode handling for auxiliary supplies up to ~35 W output |
| trr(max) | 75 ns - enables soft recovery with low di/dt-induced ringing in hard-switched topologies |
| VF(typ) | 0.98 V @ 150 °C - reduces conduction loss to ~2.9 W at 3 A RMS in typical operating conditions |
| IFSM | 55 A (8.3 ms sine) - withstands inrush and transient overloads in AC/DC front-ends |
| Tj(max) | +175 °C - allows compact thermal design with margin for ambient temperatures up to 105 °C |
Pinout & Package
STTH310 is offered in two discrete through-hole and surface-mount packages: DO-201AD (axial leaded, 9.5 mm body length) and SMC (SOD-123F-compatible, 6.25 mm × 8.15 mm footprint). Both are single-diode configurations with anode and cathode terminals only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to switch node or inductive load return path; polarity-sensitive for freewheeling direction |
| Cathode | Forward current exit / reverse blocking terminal | Connected to positive rail or clamp reference; sustains full VRRM during off-state |
Key Features
| Feature | Design Value |
|---|---|
| Soft switching behavior | Controlled reverse recovery minimizes voltage spikes and EMI generation during turn-off |
| High surge current rating | 55 A IFSM enables robustness against line transients and startup inrush in AC/DC converters |
| Planar technology | Uniform junction geometry ensures consistent trr and VF across production lots and temperature range |
| ECOPACK2 compliance | Halogen-free, RoHS-compliant materials meet stringent environmental requirements for industrial and consumer products |
Applications
| Switch-Mode Power Supply Freewheeling | PFC Boost Diode |
|---|---|
Use Scenario: Used as secondary-side freewheeling diode in 24–48 V output flyback or forward converters delivering up to 35 W. IC Role / Device Role / Timing Role: Unidirectional current path during MOSFET off-time; recirculates inductor energy with minimal voltage overshoot. Use Value: 75 ns trr and soft recovery reduce snubber losses and EMI filter component count. | Use Scenario: Positioned in the boost stage of active PFC circuits operating at 65–100 kHz with 375 V DC bus. IC Role / Device Role / Timing Role: High-voltage output rectifier sustaining 1000 V reverse bias while conducting 3 A average current. Use Value: 0.98 V VF at 150 °C lowers conduction loss versus standard fast recovery diodes, improving efficiency by ~0.4% at full load. |
| Auxiliary Power Supply Rectification | Snubber Network Clamping |
Use Scenario: Rectifies 12–24 V AC from transformer secondaries feeding control IC bias rails in industrial SMPS. IC Role / Device Role / Timing Role: Low-loss, high-reliability rectifier replacing slower general-purpose diodes in space-constrained auxiliary windings. Use Value: 175 °C Tj(max) and 20 °C/W Rth(j-l) allow stable operation without heatsinking in sealed enclosures. | Use Scenario: Integrated into RCD snubbers across MOSFET drains in half-bridge inverters driving inductive loads. IC Role / Device Role / Timing Role: Clamp voltage spike during MOSFET turn-off by absorbing inductive energy with controlled dV/dt. Use Value: Soft recovery prevents secondary oscillation that could trigger false gate triggering or stress adjacent components. |
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 |
|---|---|---|---|
| STTH3R06 | 600 V VRRM, identical IF(AV) and trr; lower VF (0.85 V typ) | Limited to 600 V systems; unsuitable for 1000 V PFC or telecom rectifiers | Select when system max reverse voltage ≤ 600 V and lowest conduction loss is prioritized |
| UF3007 | 1000 V VRRM, 3 A IF(AV), but trr = 100 ns (harder recovery), VF = 1.7 V typ | Higher EMI and conduction loss; acceptable only where cost dominates performance | Choose only for legacy designs or cost-sensitive consumer applications with relaxed EMI limits |
Compared with STTH3R06 and UF3007, the STTH310 uniquely balances 1000 V capability, 75 ns soft recovery, and sub-1 V VF at elevated temperature-making it optimal for high-efficiency, high-reliability 1 kW-class industrial power supplies.
Availability
STTH310 is available at Aetrix Electronics and suitable for switched-mode power supply freewheeling, PFC boost rectification, and snubber network clamping requiring stable component supply across automotive-grade industrial programs, medical power modules, and telecom infrastructure equipment.
Supply support for STTH310 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 the STTH310 specifically engineered for ultrafast, high-voltage rectification in compact, thermally demanding offline power supplies.
FAQ
What is the maximum allowable case temperature for STTH310 in SMC package?
The STTH310 SMC package has a maximum junction temperature of +175 °C. With Rth(j-l) = 20 °C/W and typical PCB copper area (1 cm² per lead), sustained case temperature should remain below +125 °C to maintain 50 °C thermal margin under full 3 A load, assuming 25 °C ambient and natural convection.
Does STTH310 require a heatsink in DO-201AD package at 3 A continuous?
No heatsink is required for DO-201AD-mounted STTH310 at 3 A average current if lead length is ≥15 mm and ambient temperature stays ≤75 °C. The 20 °C/W junction-to-lead thermal resistance and 175 °C Tj(max) allow safe operation with adequate PCB copper pour and airflow.
How does STTH310's soft recovery reduce EMI compared to standard fast diodes?
Soft recovery limits di/dt during turn-off by gradually removing stored charge, suppressing high-frequency ringing caused by parasitic LC networks. Measured EMI reduction exceeds 10 dB in 30–100 MHz band versus hard-recovery diodes like UF4007 in identical flyback layouts.
Can STTH310 replace BYV26E in existing 1000 V designs?
Yes-STTH310 matches BYV26E's 1000 V VRRM and 3 A IF(AV), but improves trr (75 ns vs. 100 ns), VF (0.98 V vs. 1.3 V), and thermal resistance (20 vs. 25 °C/W). No layout change is needed for DO-201AD versions; verify snubber tuning due to softer recovery.
STTH310 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1000 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.7 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 75 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1000 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -40°C ~ 175°C
STTH310 FAQ
1.How can I place an order for STTH310 through Aetrix?
Please submit a Request for Quotation (RFQ) for STTH310 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 STTH310 reliable?
The price and inventory of STTH310 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH310 is usually 5 days.
3.What payment methods are accepted for STTH310?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH310 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STTH310?
STTH310 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STTH310 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 STTH310?
For technical support, including STTH310 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH310 requirements.
6.How does Aetrix verify that STTH310 is sourced from the original manufacturer or authorized distributors?
All STTH310 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 STTH310 meets industry standards.
7.What is the process for return or replacement of STTH310?
All STTH310 units undergo pre-shipment inspection (PSI). If there is an issue with STTH310, 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 STTH310 part is unused and in its original packaging.
Return procedure for STTH310:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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