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STMicroelectronics STPS1045BY-TR
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- Part No.:
- STPS1045BY-TR
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STPS1045BY-TR.pdf
- Description:
- DIODE SCHOTTKY 45V 10A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:9,926
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Product details
Overview
STPS1045BY-TR from STMicroelectronics is an automotive-grade Schottky rectifier in DPAK package, rated for 10 A average forward current, 45 V repetitive peak reverse voltage, and 175 °C maximum junction temperature. It delivers low forward voltage drop (0.57 V max at 10 A, 125 °C), negligible switching losses, and high avalanche surge capability (75 A non-repetitive surge), making it suitable for high-frequency switch-mode power supplies in engine control units and DC-DC converters.
For engineers reviewing the STPS1045BY-TR datasheet, STPS1045BY-TR pinout, STPS1045BY-TR application, or STPS1045BY-TR equivalent, key selection criteria include forward voltage drop at elevated temperature, thermal resistance (3 °C/W junction-to-case), avalanche energy rating, reverse leakage current at 125 °C, and AEC-Q101 qualification status for automotive deployment.
Technical Context
This Schottky rectifier uses a planar silicon structure optimized for high-voltage operation while retaining low conduction loss. Its 45 V VRRM rating enables use in 24 V automotive systems with margin against load-dump transients, and its low capacitance (<500 pF at 30 V) supports efficient high-frequency rectification up to several hundred kHz.
The device features AEC-Q101 qualification, 10000 V/µs critical dV/dt rating, and robust avalanche capability (4000 W peak, 1 µs pulse). Thermal design is enabled by a low Rth(j-c) of 3 °C/W and compatibility with standard DPAK heatsinking on epoxy PCBs with ≥6 cm² copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Supports 24 V automotive bus with 87.5% headroom against ISO 7637-2 Pulse 5a (35 V) transients |
| IF(AV) | 10 A at Tc = 150 °C - Enables compact 100–200 W DC-DC stages without forced air cooling |
| VF(max) | 0.57 V at 10 A, 125 °C - Reduces conduction loss to ≤5.7 W under full load, easing thermal management |
| Rth(j-c) | 3 °C/W - Allows direct mounting to heatsink; 30 °C rise at 10 W dissipation |
| IFSM | 75 A, 10 ms sinusoidal - Withstands cold-crank surges and short-circuit recovery events |
| Tj range | −40 to +175 °C - Validated for under-hood environments including transmission control modules |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive discrete semiconductors |
Pinout & Package
Package: DPAK (TO-252), surface-mount, lead-free, UL94 V0 epoxy. Three-terminal configuration with exposed cathode tab for thermal and electrical connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry | Connected to input rail; requires low-inductance trace routing to minimize switching ringing |
| Cathode (Pin 2) | Forward current exit / common return | Electrically and thermally tied to exposed metal tab; must be soldered to ≥6 cm² copper pour |
| Tab (Cathode) | Primary thermal path & electrical cathode | Provides <3 °C/W thermal resistance to heatsink; electrically identical to Pin 2 |
Key Features
| Feature | Design Value |
|---|---|
| Negligible switching losses | No minority-carrier storage delay; enables >500 kHz operation without reverse recovery loss penalty |
| Low forward voltage drop | 0.50 V typical at 10 A, 125 °C - cuts conduction loss by ~30% vs. comparable 60 V Schottkys |
| High avalanche surge capability | 4000 W peak avalanche power (1 µs) - sustains transient overvoltage without failure during load dump |
| AEC-Q101 qualification | Validated per stress tests including HTGB, HTRB, TC, AC/DC life test - required for ASIL-B system components |
| Low junction capacitance | ~200 pF at 30 V - minimizes capacitive turn-on loss and EMI in high-dV/dt circuits |
Applications
| Engine Control Unit (ECU) Power Supply | Automotive DC-DC Converter |
|---|---|
Use Scenario: Rectifying 100–300 kHz flyback output in 12 V → 5 V/3.3 V auxiliary supply for microcontroller and sensors. IC Role / Device Role / Timing Role: Primary output rectifier; operates synchronously with PWM controller's switching frequency. Use Value: 0.57 V VF limits power loss to 5.7 W at 10 A, enabling natural convection cooling in sealed ECU housing. | Use Scenario: Secondary-side rectification in isolated 24 V → 12 V buck-derived converter for ADAS camera module. IC Role / Device Role / Timing Role: High-efficiency freewheeling diode in synchronous rectified topology. Use Value: Low Cj and zero Qrr eliminate reverse recovery noise, reducing EMI filter size by 40%. |
| Transmission Control Module (TCM) | On-Board Charger (OBC) Auxiliary Supply |
Use Scenario: Input rectification for 24 V backup power rail handling gear-shift actuator drivers during cranking. IC Role / Device Role / Timing Role: Input protection and hold-up rectifier; withstands −0.5 V to +35 V transients per ISO 16750-2. Use Value: 75 A IFSM and 10000 V/µs dV/dt rating prevent failure during cold-crank voltage collapse and rebound. | Use Scenario: Output rectifier in 400 V → 12 V auxiliary supply powering OBC control logic and gate drivers. IC Role / Device Role / Timing Role: Isolated secondary-side power delivery component; operates at 150–250 kHz. Use Value: AEC-Q101 qualification ensures reliability across 15-year vehicle lifetime under thermal cycling and vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-10BQ040-M3/45 | 40 V VRRM, 0.52 V VF typ. at 10 A, 125 °C; same DPAK package | Lacks AEC-Q101 qualification; not validated for automotive temperature cycling or humidity testing | Select only for industrial or consumer designs where automotive qualification is not mandated |
| ON Semiconductor MBR1045CT | 45 V VRRM, dual common-cathode configuration; TO-220AC package; higher Rth(j-c) (2.5 °C/W but larger footprint) | Not surface-mount; requires through-hole assembly and mechanical mounting; no AEC-Q101 data published | Prefer only when board layout prohibits DPAK or when dual-output rectification is needed |
Compared with VS-10BQ040-M3/45 and MBR1045CT, STPS1045BY-TR uniquely combines AEC-Q101 compliance, DPAK SMT compatibility, and 45 V/10 A rating in a single-source qualified part-critical for Tier 1 automotive BOMs requiring audit-ready qualification evidence.
Availability
STPS1045BY-TR is available at Aetrix Electronics and suitable for engine control units, transmission control modules, ADAS camera power supplies, and on-board charger auxiliary rails requiring stable component supply across extended automotive lifecycles.
Supply support for STPS1045BY-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 analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.
The STPS series targets high-reliability power conversion in harsh environments, with emphasis on AEC-Q101-qualified Schottky rectifiers optimized for efficiency, thermal robustness, and transient immunity in 12 V/24 V automotive subsystems.
FAQ
Is STPS1045BY-TR suitable for synchronous rectification topologies?
No - STPS1045BY-TR is a passive Schottky diode, not a MOSFET-based synchronous rectifier. It functions as a unidirectional freewheeling or output rectifier. For synchronous rectification, discrete N-channel MOSFETs or integrated SR controllers (e.g., STSR3) must be used in conjunction with this diode only as a backup or clamp.
What is the minimum recommended copper area for the DPAK tab on FR-4 PCB?
ST recommends ≥6 cm² of 35 µm-thick copper connected directly to the exposed cathode tab. This achieves Rth(j-a) ≈ 70 °C/W. Smaller areas increase thermal resistance nonlinearly; 2 cm² raises Rth(j-a) to ~150 °C/W, risking thermal runaway above 5 A continuous current.
Does STPS1045BY-TR have a specified reverse recovery time (trr)?
No - as a Schottky barrier diode, it exhibits no minority-carrier storage and therefore has no defined trr. Its switching behavior is governed solely by junction capacitance discharge, resulting in effectively zero reverse recovery charge (Qrr = 0). This eliminates reverse recovery loss and associated EMI.
Can STPS1045BY-TR replace STPS10H100CG in a 100 V design?
No - STPS10H100CG is rated for 100 V VRRM; substituting STPS1045BY-TR (45 V) would result in catastrophic avalanche failure under normal operating voltage. The 45 V rating is absolute maximum; design margin requires ≥2× operating voltage, making it unsuitable for any circuit exceeding 22.5 V DC or peak.
STPS1045BY-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io):
- 10A
- Voltage - Forward (Vf) (Max) @ If:
- 630 mV @ 10 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 45 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
- Operating Temperature - Junction:
- -40°C ~ 175°C
STPS1045BY-TR FAQ
1.How can I place an order for STPS1045BY-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1045BY-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 STPS1045BY-TR reliable?
The price and inventory of STPS1045BY-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1045BY-TR is usually 5 days.
3.What payment methods are accepted for STPS1045BY-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1045BY-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1045BY-TR?
STPS1045BY-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1045BY-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 STPS1045BY-TR?
For technical support, including STPS1045BY-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1045BY-TR requirements.
6.How does Aetrix verify that STPS1045BY-TR is sourced from the original manufacturer or authorized distributors?
All STPS1045BY-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 STPS1045BY-TR meets industry standards.
7.What is the process for return or replacement of STPS1045BY-TR?
All STPS1045BY-TR units undergo pre-shipment inspection (PSI). If there is an issue with STPS1045BY-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 STPS1045BY-TR part is unused and in its original packaging.
Return procedure for STPS1045BY-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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