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STMicroelectronics STPS340UY
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- Part No.:
- STPS340UY
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
STPS340UY.pdf
- Description:
- DIODE SCHOTTKY 40V 3A SMB
- Quantity:
- Payment:
- Shipping:
Inventory:1,995
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Product details
Overview
STPS340UY from STMicroelectronics is an AEC-Q101-qualified automotive Schottky rectifier in SMB package, rated for 3 A average forward current, 40 V repetitive peak reverse voltage, and 0.57 V maximum forward voltage at 125 °C. It delivers negligible switching losses and low thermal resistance (25 °C/W junction-to-lead) for high-frequency DC/DC converters and free-wheeling in engine control units.
For engineers reviewing the STPS340UY datasheet, STPS340UY pinout, STPS340UY application, or STPS340UY equivalent, key selection criteria include its avalanche-rated capability (1300 W at 1 µs), -40 to +150 °C operating junction temperature, and surface-mount SMB footprint with cathode band marking.
Technical Context
This Schottky diode operates as a unidirectional power rectifier with no minority-carrier storage delay, enabling extremely fast switching and zero reverse recovery charge. Its low VF and low Rth(j-l) directly reduce conduction loss and thermal stress in compact automotive power stages.
The device is characterized for pulsed surge currents up to 75 A (10 ms sinusoidal) and avalanche energy handling per pulse duration and junction temperature, with normalized derating curves provided for design margining under transient overvoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 3 A - continuous forward current rating at TL = 95 °C with 50% duty cycle, defining steady-state power handling in SMPS output stages |
| VRRM | 40 V - maximum repetitive reverse voltage, setting safe blocking capability in 12 V/24 V automotive bus applications |
| VF (max) | 0.57 V at IF = 3 A, Tj = 125 °C - low conduction loss enabling >95% efficiency in low-voltage synchronous rectifier replacements |
| Rth(j-l) | 25 °C/W - junction-to-lead thermal resistance, enabling direct PCB copper pad heat sinking without external heatsink in SMB layout |
| IFSM | 75 A at tp = 10 ms - non-repetitive surge rating supporting load dump and cranking transient immunity |
| PARM | 1300 W at tp = 1 µs, Tj = 25 °C - specified avalanche power capability for clamping inductive kickback in solenoid drivers |
Pinout & Package
STPS340UY is housed in an SMB (DO-214AA) surface-mount package with two terminals: anode and cathode. The cathode is marked by a band on the body. This package supports automated placement and reflow soldering per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side of rectification path; must be routed with low-inductance trace in high-dI/dt applications |
| Cathode | Forward current exit point / reverse voltage blocking terminal | Marked by band; connects to output/load side and serves as reference node for voltage clamping during avalanche events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood environments including temperature cycling, humidity, and mechanical shock per JESD47 |
| Low VF and negligible switching loss | Eliminates reverse recovery loss and enables >500 kHz operation without snubbers in DC/DC converters |
| Specified avalanche capability | Guaranteed single-pulse energy absorption up to 1300 W at 1 µs, enabling robustness against inductive transients |
| Low thermal resistance (Rth(j-l)) | 25 °C/W allows direct thermal coupling to PCB copper, reducing need for thermal vias or heatsinks in space-constrained modules |
Applications
| Engine Control Unit (ECU) Power Stage | Automotive Infotainment DC/DC Converter |
|---|---|
Use Scenario: Rectifying switched 12 V supply in ECU main power rail with frequent load dumps and cranking transients. IC Role / Device Role / Timing Role: Schottky rectifier providing low-loss freewheeling path and avalanche clamping during MOSFET turn-off. Use Value: 0.57 V VF at 125 °C reduces conduction loss by ~30% vs. standard silicon diodes, lowering thermal stress on adjacent MCU and gate drivers. | Use Scenario: Output rectification in 5 V/3 A buck converter powering display backlight and audio amplifiers. IC Role / Device Role / Timing Role: High-frequency synchronous rectifier replacement delivering minimal voltage drop and zero reverse recovery. Use Value: Extremely fast switching eliminates need for snubber networks, simplifying layout and improving EMI performance above 300 kHz. |
| Body Control Module (BCM) Polarity Protection | Electric Power Steering (EPS) Motor Driver Freewheeling |
Use Scenario: Reverse polarity protection at 12 V input of BCM, exposed to jump-start surges and battery reversal. IC Role / Device Role / Timing Role: Forward-biased Schottky diode blocking reverse current while conducting normal supply with minimal loss. Use Value: 40 V VRRM and AEC-Q101 qualification ensure reliable operation during 24 V jump-start events and long-term underhood reliability. | Use Scenario: Freewheeling path across H-bridge motor winding during PWM commutation in EPS actuator. IC Role / Device Role / Timing Role: Low-inductance, low-VF path for inductive current decay, minimizing voltage spikes and MOSFET stress. Use Value: 75 A IFSM rating handles peak motor regeneration currents; SMB footprint fits tight motor driver PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STPS340SY | Same die, SMC package (Rth(j-l) = 20 °C/W, higher surge current margin) | Better thermal performance in higher-power or lower-airflow locations; larger footprint | Select when board space permits and thermal margin is critical over cost or size |
| MBR340T3G | 3 A/40 V Schottky in SMB, VF = 0.54 V typ. at 3 A, but not AEC-Q101 qualified | Limited to non-automotive industrial use; lacks avalanche rating and automotive temp range validation | Acceptable only for commercial-grade designs where automotive qualification is not required |
Compared with STPS340SY and MBR340T3G, STPS340UY uniquely balances AEC-Q101 compliance, SMB footprint, and guaranteed avalanche capability-making it the only choice for space-constrained, safety-critical automotive rectification where qualification and transient robustness are mandatory.
Availability
STPS340UY is available at Aetrix Electronics and suitable for engine control units, infotainment power supplies, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for STPS340UY 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 analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
STPS340UY belongs to ST's automotive-qualified power Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability rectification in 12 V/24 V vehicle electrical systems.
FAQ
What is the maximum junction temperature for continuous operation?
The STPS340UY has a specified operating junction temperature range of -40 to +150 °C. Continuous operation at 150 °C is permitted only when thermal design ensures junction temperature does not exceed this limit under worst-case ambient and power dissipation conditions, as validated by Rth(j-l) = 25 °C/W and derated power curves in the datasheet.
Is STPS340UY suitable for synchronous rectification?
STPS340UY is a passive Schottky rectifier-not a synchronous rectifier controller or MOSFET-based solution. It functions as a high-efficiency freewheeling or output rectifier in flyback, buck, or boost topologies where its low VF and zero reverse recovery enable synchronous-like efficiency without gate drive complexity.
Does STPS340UY require a heatsink in typical automotive applications?
No external heatsink is required if PCB layout provides adequate copper area (≥4 cm² per lead) and airflow is limited. With Rth(j-l) = 25 °C/W and typical 3 A/0.57 V operation generating ~1.7 W loss, junction temperature rise remains within limits using standard FR4 with 35 µm copper, per Figure 12 in the datasheet.
How is avalanche capability tested and rated?
Avalanche capability is tested per JEDEC JESD24-11 using single-pulse 1 µs square-wave conditions at Tj = 25 °C, yielding PARM = 1300 W. The device is rated for repetitive avalanche only if energy per pulse stays below the derated curve in Figure 5, and total pulse count remains within lifetime limits defined by ST's automotive qualification protocol.
STPS340UY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 630 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 20 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
- Operating Temperature - Junction:
- -40°C ~ 150°C
STPS340UY FAQ
1.How can I place an order for STPS340UY through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS340UY 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 STPS340UY reliable?
The price and inventory of STPS340UY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS340UY is usually 5 days.
3.What payment methods are accepted for STPS340UY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS340UY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS340UY?
STPS340UY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS340UY 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 STPS340UY?
For technical support, including STPS340UY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS340UY requirements.
6.How does Aetrix verify that STPS340UY is sourced from the original manufacturer or authorized distributors?
All STPS340UY 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 STPS340UY meets industry standards.
7.What is the process for return or replacement of STPS340UY?
All STPS340UY units undergo pre-shipment inspection (PSI). If there is an issue with STPS340UY, 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 STPS340UY part is unused and in its original packaging.
Return procedure for STPS340UY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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