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STMicroelectronics STTH310UFY
- Part No.:
- STTH310UFY
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
STTH310UFY.pdf
- Description:
- DIODE GEN PURP 1KV 3A SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:12,526
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Product details
Overview
STTH310UFY from STMicroelectronics is an AEC-Q101-qualified 1000 V, 3 A ultrafast recovery silicon rectifier diode in SMB Flat package with wettable leads, featuring 52 ns typical reverse recovery time, 0.98 V typical forward voltage at 150 °C and 3 A, and 175 °C maximum junction temperature - deployed as free-wheeling diodes in automotive DC-DC converters and SMPS base-drive circuits.
For engineers reviewing the STTH310UFY datasheet, STTH310UFY pinout, STTH310UFY application, or STTH310UFY equivalent, key selection criteria include ultrafast trr (52 ns), low VF at high Tj (0.98 V @ 150 °C), AEC-Q101 qualification, SMB Flat thermal performance (Rth(j-l) = 16 °C/W), and ECOPACK3 compliance for automotive power switching designs.
Technical Context
This ultrafast rectifier uses ST's planar 1000 V technology optimized for minimal conduction and switching losses in hard-switched topologies. Its low Qrr and negligible tail current enable efficient operation in high-frequency (>100 kHz) automotive power supplies and transistor snubbers.
The device operates up to 175 °C junction temperature with stable VF and trr across temperature, supported by a thermally robust SMB Flat package with wettable leads for automated optical solder-joint inspection - critical for ASIL-B system-level reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - supports input stages of 800 V DC-link automotive inverters and industrial SMPS without derating |
| IF(AV) | 3 A @ TL = 95 °C - rated continuous current for compact heatsink-free PCB layouts in space-constrained modules |
| trr (typ.) | 52 ns - enables >200 kHz switching frequency while limiting EMI and diode-induced voltage spikes |
| VF (typ.) | 0.98 V @ Tj = 150 °C, IF = 3 A - reduces conduction loss by ~25% vs. standard fast diodes at elevated temperature |
| Rth(j-l) | 16 °C/W - allows direct thermal coupling to PCB copper pour, eliminating need for external heatsinks in 5–10 W applications |
| Tj(max) | 175 °C - meets under-hood automotive ambient requirements without thermal throttling in engine control units |
Pinout & Package
SMB Flat package: surface-mount, single-diode configuration with cathode-marked lead (cathode band on top surface), wettable flank leads for AOI-compatible solder joints, epoxy UL94-V0, lead-free, ECOPACK3 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to switch node (e.g., MOSFET drain) in flyback/freewheeling paths; handles 30 A surge (8.3 ms) |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output rail or ground return; sustains 1000 V reverse bias with <1 µA leakage at 25 °C |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power electronics per stress test requirements including HTGB, HTRB, and temperature cycling |
| Ultrafast trr = 52 ns | Minimizes reverse recovery charge (Qrr) and associated switching loss in hard-commutated PFC and LLC resonant converters |
| VF = 0.98 V @ 150 °C | Reduces thermal runaway risk and improves efficiency stability over full automotive temperature range |
| SMB Flat with wettable leads | Enables automated optical inspection of solder fillets - required for IPC-A-610 Class 3 automotive assembly compliance |
| ECOPACK3 compliance | Meets RoHS, REACH, and halogen-free requirements for global automotive OEM supply chains |
Applications
| Automotive DC-DC Converters | On-Board Charger (OBC) Auxiliary Supplies |
|---|---|
Use Scenario: 48 V–12 V bidirectional buck-boost converter in mild-hybrid vehicles. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous rectification stage, handling 3 A continuous reverse-recovery current. Use Value: 52 ns trr prevents shoot-through during high-side MOSFET turn-on, maintaining >94% peak efficiency at 200 kHz. | Use Scenario: Isolated auxiliary power supply for gate drivers and MCU in 11 kW OBC. IC Role / Device Role / Timing Role: Output rectifier in 300 kHz flyback converter feeding 15 V/2 A control rail. Use Value: Low VF at 150 °C ensures stable 15 V regulation under under-hood thermal stress without output droop. |
| Industrial SMPS Snubbers | EV Traction Inverter Gate Drive Supplies |
Use Scenario: RCD snubber network clamping IGBT collector voltage spikes in motor drives. IC Role / Device Role / Timing Role: Fast recovery clamp diode absorbing turn-off energy from 1200 V IGBTs. Use Value: Negligible tail current avoids secondary voltage overshoot, reducing snubber capacitor stress by 35%. | Use Scenario: Isolated DC-DC supply powering isolated gate drivers in dual-motor EV inverters. IC Role / Device Role / Timing Role: Secondary-side rectifier in 500 kHz resonant LLC transformer output stage. Use Value: 175 °C Tj rating allows placement near high-temperature power modules without derating or thermal pads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR310E | Higher VF (1.25 V typ. @ 150 °C), same trr (50 ns), TO-220AC package | Requires heatsink; unsuitable for space-constrained automotive modules | Prefer when board-level thermal management is available and cost sensitivity outweighs footprint constraints |
| Vishay VS-3EY10 | Lower IF(AV) (2.5 A), identical VRRM (1000 V), SMB Flat but non-AEC-Q101 | Lacks automotive qualification; limited to industrial/commercial use | Select only for non-automotive 1000 V freewheeling where AEC-Q101 is not mandated |
Compared with MUR310E and VS-3EY10, STTH310UFY uniquely combines AEC-Q101, SMB Flat wettable leads, and sub-1 V VF at 150 °C - enabling compact, reliable, and inspection-ready automotive power conversion without thermal compromise.
Availability
STTH310UFY is available at Aetrix Electronics and suitable for automotive DC-DC converters, on-board chargers, and industrial SMPS requiring stable component supply, AEC-Q101 compliance, and high-temperature reliability.
Supply support for STTH310UFY 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, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The STTH ultrafast rectifier product line targets high-efficiency, high-reliability power conversion in automotive electrification and industrial automation - emphasizing low-loss, high-Tj operation, and AEC-Q101 validation.
FAQ
What is the maximum allowable junction temperature for STTH310UFY, and how does it impact layout design?
The STTH310UFY has a maximum junction temperature of 175 °C, verified per AEC-Q101 thermal cycling and HTGB tests. This allows placement directly adjacent to power MOSFETs or IGBTs on shared PCB copper pours without forced air or heatsinks - provided Rth(j-a) is maintained ≤ 40 °C/W via ≥ 4 cm² 70 µm copper per lead, as specified in Figure 6 of DS10085.
Is STTH310UFY pin-compatible with other SMB Flat ultrafast diodes like STTH2R06 or STTH3L06?
No - STTH310UFY is not pin-compatible with STTH2R06 or STTH3L06. While all use SMB Flat packages, STTH310UFY has anode-cathode polarity oriented for freewheeling in high-side switch configurations, whereas STTH2R06 is optimized for low-voltage (60 V) logic-level applications with different thermal pad geometry and lead coplanarity specs per its ECOPACK2 variant.
Does STTH310UFY require a snubber circuit when used in 200 kHz flyback converters?
Not inherently - its 52 ns trr and low Qrr (<15 nC, derived from trr and di/dt curves in DS10085) minimize voltage overshoot during MOSFET turn-on. However, a small RC snubber (e.g., 100 Ω + 100 pF) is recommended at the drain-node to damp ringing induced by PCB parasitics, especially when operating above 150 kHz with >10 A peak currents.
How does the wettable flank design of STTH310UFY improve manufacturing yield in automotive SMT lines?
The wettable flank leads on STTH310UFY extend solderable surfaces vertically along the side of each lead, enabling automated optical inspection (AOI) systems to verify solder fillet height, wetting angle, and voiding - meeting IPC-A-610 Class 3 requirements. This eliminates manual visual checks and reduces field failure rates linked to cold-solder joints in safety-critical 12 V/48 V power rails.
STTH310UFY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ECOPACK®2
- Package/Case:
- DO-221AA, SMB Flat Leads
- Packaging:
- Tape & Reel (TR)
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMBflat
- Operating Temperature - Junction:
- -40°C ~ 175°C
STTH310UFY FAQ
1.How can I place an order for STTH310UFY through Aetrix?
Please submit a Request for Quotation (RFQ) for STTH310UFY 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 STTH310UFY reliable?
The price and inventory of STTH310UFY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STTH310UFY is usually 5 days.
3.What payment methods are accepted for STTH310UFY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STTH310UFY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STTH310UFY?
STTH310UFY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STTH310UFY 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 STTH310UFY?
For technical support, including STTH310UFY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STTH310UFY requirements.
6.How does Aetrix verify that STTH310UFY is sourced from the original manufacturer or authorized distributors?
All STTH310UFY 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 STTH310UFY meets industry standards.
7.What is the process for return or replacement of STTH310UFY?
All STTH310UFY units undergo pre-shipment inspection (PSI). If there is an issue with STTH310UFY, 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 STTH310UFY part is unused and in its original packaging.
Return procedure for STTH310UFY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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