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STMicroelectronics STPS1045B-TR
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- Part No.:
- STPS1045B-TR
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STPS1045B-TR.pdf
- Description:
- DIODE SCHOTTKY 45V 10A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,006
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Product details
Overview
STPS1045B-TR from STMicroelectronics is a high-voltage Schottky rectifier in DPAK package, rated for 10 A average forward current and 45 V repetitive peak reverse voltage, with typical forward voltage drop of 0.50 V at 10 A and 125 °C, designed for high-frequency switch-mode power supplies requiring low conduction and switching losses.
For engineers reviewing the STPS1045B-TR datasheet, STPS1045B-TR pinout, STPS1045B-TR application, or STPS1045B-TR equivalent, key selection criteria include thermal resistance (3 °C/W junction-to-case), avalanche rating (285 W at 10 µs), low capacitance, ECOPACK®2 compliance, and DPAK footprint compatibility with high-power PCB thermal management.
Technical Context
This Schottky rectifier uses a planar silicon structure optimized for fast recovery and minimal reverse recovery charge, enabling operation in high-frequency DC-DC converters up to several hundred kHz. Its low VF and negligible switching losses stem from majority-carrier conduction and absence of minority-carrier storage delay.
The device features an avalanche-rated capability (285 W, 10 µs pulse at Tj = 125 °C) and is characterized across -65 °C to +175 °C storage and operating junction temperature range, with thermal performance validated under conduction-cooled conditions using the DPAK thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 10 A - maximum continuous forward current at Tc = 150 °C, defining steady-state power handling in thermally managed layouts |
| VRRM | 45 V - peak reverse blocking voltage, setting maximum input/output voltage differential in buck, boost, or flyback topologies |
| VF(typ) | 0.50 V @ 10 A, 125 °C - directly determines conduction loss (P ≈ IF × VF) and thermal load in high-current paths |
| Rth(j-c) | 3 °C/W - quantifies thermal path efficiency from junction to case, critical for heatsink sizing and reliability margin |
| IR(max) | 15 mA @ 125 °C, VR = VRRM - reverse leakage sets standby power loss and affects light-load efficiency in offline SMPS |
| PARM | 285 W @ 10 µs, Tj = 125 °C - defines single-pulse avalanche energy tolerance during transient overvoltage events |
| CJ(typ) | ~120 pF @ 4.5 V - low junction capacitance minimizes switching node ringing and EMI in high-dV/dt applications |
Pinout & Package
DPAK (TO-252) package with exposed thermal pad on underside; three terminals: Anode (pin 1), Cathode (pin 2), and thermal tab (electrically connected to cathode, pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to input/high-side node; must withstand full reverse voltage when off |
| Cathode (Pin 2) | Forward current exit point | Common output/return node; electrically tied to thermal tab for low-inductance heat sinking |
| Thermal Tab (Pin 3) | Thermal interface / cathode extension | Requires soldered copper pour for thermal conduction; not isolated - must be routed at cathode potential |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.50 V typ. @ 10 A, 125 °C - reduces conduction loss by ~25% vs. comparable 60 V Schottkys in same package |
| Extremely fast switching | No reverse recovery time (trr ≈ 0 ns) - eliminates snubber requirements and associated losses in high-frequency designs |
| Avalanche-rated operation | 285 W single-pulse rating - enables robustness against inductive kickback without external clamping in flyback or LLC resonant converters |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant epoxy - meets industrial and consumer environmental mandates without derating or process change |
| Low thermal resistance | 3 °C/W junction-to-case - supports >8 W continuous dissipation with modest heatsinking, simplifying thermal layout |
Applications
| AC-DC Adapter Secondary Rectification | DC-DC Converter Output Rectification |
|---|---|
Use Scenario: 12–24 V output stage in 65 W laptop adapter with 100 kHz switching frequency. IC Role / Device Role / Timing Role: Primary output rectifier conducting 10 A average current with minimal voltage drop and zero reverse recovery. Use Value: Enables >92% full-load efficiency and eliminates need for active synchronous rectification control circuitry. | Use Scenario: 5 V/10 A output rail in telecom intermediate bus converter (IBC) operating at 300 kHz. IC Role / Device Role / Timing Role: High-frequency freewheeling diode in phase-shifted full-bridge topology. Use Value: Reduces switching node oscillation amplitude by 40% versus standard FRD due to low CJ and absence of Qrr. |
| Industrial UPS Hold-up Rectification | LED Driver Boost Stage Rectification |
Use Scenario: Input rectifier in 48 V battery-backed UPS front-end, handling surge currents up to 75 A (10 ms). IC Role / Device Role / Timing Role: Surge-capable freewheeling path during AC dropout and battery switchover. Use Value: Withstands IFSM = 75 A without degradation, avoiding fuse coordination issues and improving system MTBF. | Use Scenario: Output rectifier in 40 V, 700 mA constant-current LED driver with 250 kHz boost controller. IC Role / Device Role / Timing Role: High-efficiency, low-noise rectifier minimizing EMI in sensitive lighting environments. Use Value: Low VF and <120 pF capacitance reduce conducted EMI by 8 dBµV in CISPR-22 Class B testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MBR1045CT | TO-220AB dual-diode package; VF = 0.72 V @ 10 A, 25 °C; Rth(j-c) = 4.5 °C/W | Higher thermal resistance and larger footprint; requires mechanical mounting and isolation | Preferred where dual common-cathode configuration is needed and board space allows TO-220 |
| Vishay VS-10BQ045 | DPAK package; VF = 0.54 V @ 10 A, 125 °C; no specified avalanche rating; IR = 20 mA @ 125 °C | Lacks PARM specification; higher leakage may impact light-load efficiency in standby-sensitive designs | Suitable for cost-sensitive, non-avalanche-critical applications with relaxed leakage budgets |
Compared with MBR1045CT and VS-10BQ045, STPS1045B-TR offers superior thermal performance (3 vs. ≥4.5 °C/W), guaranteed avalanche ruggedness, and lowest VF at elevated temperature - making it optimal for compact, high-reliability, high-frequency power stages.
Availability
STPS1045B-TR is available at Aetrix Electronics and suitable for AC-DC adapters, telecom DC-DC converters, industrial UPS systems, and LED drivers requiring stable component supply and long-term manufacturability.
Supply support for STPS1045B-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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The STPS series targets high-efficiency power conversion, with STPS1045B-TR specifically engineered for high-frequency, high-reliability Schottky rectification in space-constrained, thermally demanding applications.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The STPS1045B-TR has a maximum operating junction temperature of 175 °C, verified under conditions that prevent thermal runaway when mounted on an appropriate heatsink. This rating applies across the full IF(AV) range when case temperature is maintained ≤150 °C per absolute ratings table.
Is the thermal pad electrically isolated?
No, the DPAK thermal pad is internally connected to the cathode (Pin 2). It must be routed to the cathode net on the PCB and cannot be used for electrical isolation. Soldering the pad improves thermal performance but introduces no additional electrical functionality beyond cathode connection.
Can STPS1045B-TR replace a standard PN-junction rectifier in existing designs?
Yes, provided reverse voltage and surge current requirements are met. Its lower VF reduces conduction loss and self-heating, while zero Qrr eliminates reverse recovery spikes. However, higher IR at elevated temperature must be evaluated in low-power standby modes to avoid excessive leakage-related losses.
Does this part require a minimum copper area for thermal performance?
Yes. ST recommends ≥100 mm² of 2-oz copper connected to the thermal pad for optimal Rth(j-a) performance. The datasheet provides derating curves showing ambient temperature limits versus copper surface area, with full 10 A rating achievable only when ≥200 mm² is used at 50 °C ambient.
STPS1045B-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
- Operating Temperature - Junction:
- 175°C (Max)
STPS1045B-TR FAQ
1.How can I place an order for STPS1045B-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1045B-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 STPS1045B-TR reliable?
The price and inventory of STPS1045B-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1045B-TR is usually 5 days.
3.What payment methods are accepted for STPS1045B-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1045B-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1045B-TR?
STPS1045B-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1045B-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 STPS1045B-TR?
For technical support, including STPS1045B-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1045B-TR requirements.
6.How does Aetrix verify that STPS1045B-TR is sourced from the original manufacturer or authorized distributors?
All STPS1045B-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 STPS1045B-TR meets industry standards.
7.What is the process for return or replacement of STPS1045B-TR?
All STPS1045B-TR units undergo pre-shipment inspection (PSI). If there is an issue with STPS1045B-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 STPS1045B-TR part is unused and in its original packaging.
Return procedure for STPS1045B-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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