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STMicroelectronics STPS1045B
- Part No.:
- STPS1045B
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STPS1045B.pdf
- Description:
- DIODE SCHOTTKY 45V 10A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:936
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Product details
Overview
STPS1045B from STMicroelectronics is a high-voltage Schottky rectifier in DPAK package, rated for 45 V repetitive peak reverse voltage and 10 A average forward current at Tc = 150 °C, 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 datasheet, STPS1045B pinout, STPS1045B application, or STPS1045B equivalent, key selection factors include its 3 °C/W junction-to-case thermal resistance, avalanche-rated 285 W peak power capability at 125 °C, low 0.63 V VF (typ) at 25 °C/10 A, and ECOPACK®2-compliant DPAK packaging for industrial power conversion designs.
Technical Context
This Schottky rectifier employs a planar silicon structure optimized for fast recovery and minimal reverse recovery charge, enabling operation in high-frequency DC-DC converters and AC-DC front-ends up to several hundred kHz. Its low capacitance and negligible switching losses stem from absence of minority-carrier storage, distinguishing it from PN-junction diodes.
The device supports surge currents up to 75 A (10 ms sinusoidal) and operates with maximum junction temperature of 175 °C, enabled by low thermal resistance (Rth(j-c) = 3 °C/W) and thermally efficient DPAK package with exposed cathode pad for direct heatsink mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse blocking voltage; defines safe operating range in flyback or boost topologies. |
| IF(AV) | 10 A at Tc = 150 °C - Continuous forward current rating under heatsink-cooled conditions; determines PCB copper area and thermal design. |
| VF (typ) | 0.50 V at 10 A, 125 °C - Low conduction loss enables >95% efficiency in 12 V output rails at high load. |
| Rth(j-c) | 3 °C/W - Enables direct thermal path to heatsink; allows 95 W max dissipation before reaching 175 °C junction limit. |
| PARM | 285 W at tp = 10 µs, Tj = 125 °C - Avalanche energy rating supports transient overvoltage robustness in unregulated input stages. |
| IR (max) | 15 mA at 125 °C, VR = VRRM - Low leakage preserves efficiency in standby mode and high-temperature environments. |
| IFSM | 75 A (10 ms sinusoidal) - Withstands inrush and short-circuit transients without degradation in SMPS primary-side rectification. |
Pinout & Package
DPAK (TO-252) package with three terminals: anode (pin 1), cathode (exposed tab/pin 2–3 shorted), and no gate or control terminal. The thermally enhanced metal tab serves as cathode and primary heat dissipation path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Soldered to input rail or transformer secondary; must withstand 75 A surge and 45 V reverse bias. |
| Cathode (Tab + Pins 2–3) | Forward current exit / thermal interface | Electrically and thermally connected; requires soldered copper pour or mechanical heatsink for Rth(j-c) = 3 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at high temperature | 0.50 V typ @ 125 °C/10 A - Reduces conduction loss by ~30% vs. standard Schottkys at elevated ambient. |
| Avalanche energy rating | 285 W peak @ 10 µs - Enables use in non-clamped topologies like LLC resonant converters without external snubbers. |
| Thermal resistance | 3 °C/W junction-to-case - Allows compact thermal design with ≤10 cm² 2 oz copper on FR-4 for 10 A continuous operation. |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant epoxy - Meets IPC-1752A material declaration requirements for automotive and industrial OEMs. |
Applications
| Server PSU Rectification | Laptop Adapter Output Stage |
|---|---|
Use Scenario: High-efficiency 48 V to 12 V intermediate bus conversion in 1U server PSUs operating at 250 kHz switching frequency. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacement; handles 10 A DC output with minimal voltage drop and zero reverse recovery delay. Use Value: Achieves 0.50 V VF at full load and 125 °C, reducing conduction loss by 1.2 W vs. legacy 0.65 V Schottkys and enabling 94.8% efficiency at 50% load. | Use Scenario: 19 V/4.74 A output rectification in compact 90 W laptop adapters using quasi-resonant flyback topology. IC Role / Device Role / Timing Role: Output freewheeling diode; conducts during MOSFET off-time with sub-10 ns turn-off to minimize ringing and EMI. Use Value: Low 0.63 V VF (25 °C) and 7 mA IR (125 °C) ensure <0.5 W loss at full load and stable regulation across -20 to +70 °C ambient. |
| Industrial Motor Drive DC Link | Telecom Rectifier Module |
Use Scenario: Input rectification for 24 V/15 A brushless DC motor drive with 400 VAC input and active PFC stage. IC Role / Device Role / Timing Role: Boost converter catch diode; sustains 75 A surge during startup and handles 45 V reverse recovery stress. Use Value: 285 W avalanche rating eliminates need for TVS clamping; 175 °C Tj rating supports operation in sealed enclosures up to 85 °C ambient. | Use Scenario: -48 V telecom rectifier module output stage delivering 30 A total across parallel channels. IC Role / Device Role / Timing Role: Parallel-connected output rectifier; shares current with matched VF and low thermal impedance for stable derating. Use Value: 3 °C/W Rth(j-c) enables uniform current sharing across 3× STPS1045B in parallel, maintaining <2 °C inter-device ΔT at 10 A each. |
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-10E45-M3 | Same 45 V VRRM, 10 A IF(AV), but VF = 0.65 V (typ) at 125 °C/10 A; Rth(j-c) = 3.5 °C/W. | Higher conduction loss limits use in >94% efficiency designs; less suitable for thermally constrained telecom modules. | Select when cost sensitivity outweighs 0.15 V VF advantage and thermal margin is ≥5 °C. |
| ON Semiconductor SB1045 | Identical VRRM and IF(AV), but VF = 0.68 V (typ) at 25 °C/10 A; no published avalanche rating. | Lacks PARM specification; not recommended for unclamped or high-dV/dt flyback circuits. | Prefer only in low-stress AC-DC adapters where transient robustness is verified externally. |
Compared with VS-10E45-M3 and SB1045, STPS1045B delivers lower conduction loss (0.50 V vs. ≥0.65 V), superior thermal performance (3 °C/W vs. ≥3.5 °C/W), and guaranteed avalanche capability-critical for reliability in high-density, high-reliability power systems.
Availability
STPS1045B is available at Aetrix Electronics and suitable for server power supplies, laptop adapters, industrial motor drives, and telecom rectifier modules requiring stable component supply and long-term industrial lifecycle support.
Supply support for STPS1045B 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 industrial, automotive, and consumer markets.
The STPS series targets high-efficiency power conversion, with STPS1045B specifically engineered for high-frequency, high-reliability Schottky rectification in space-constrained and thermally demanding applications.
FAQ
What is the maximum allowable case temperature for continuous 10 A operation?
The datasheet specifies IF(AV) = 10 A at Tc = 150 °C. To sustain this current continuously, the case (heatsink) temperature must be held at or below 150 °C. Exceeding this requires derating per Figure 2, where 10 A is limited to ~110 °C ambient with 2 oz copper on FR-4.
Is STPS1045B suitable for synchronous rectification replacement?
No - STPS1045B is a passive Schottky diode, not a MOSFET-based synchronous rectifier. It replaces standard PN diodes in freewheeling or output rectification roles but cannot be actively controlled. For synchronous designs, discrete N-channel MOSFETs like STP16NF06L are required.
Does the DPAK package require thermal vias under the tab?
Yes - the exposed cathode tab is electrically and thermally connected to pins 2–3. To achieve the specified Rth(j-c) = 3 °C/W, at least six 0.3 mm thermal vias (filled or plated) must connect the tab to an internal or backside copper plane, per ST's AN4105 layout guidelines.
How does the avalanche rating impact circuit protection design?
The 285 W PARM rating at 125 °C allows the device to absorb single-event overvoltage transients (e.g., inductive kickback or line surges) without failure. This eliminates need for external clamping components in many flyback and boost converters, simplifying BOM and improving reliability.
STPS1045B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for STPS1045B through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1045B 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 reliable?
The price and inventory of STPS1045B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1045B is usually 5 days.
3.What payment methods are accepted for STPS1045B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1045B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1045B?
STPS1045B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1045B 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?
For technical support, including STPS1045B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1045B requirements.
6.How does Aetrix verify that STPS1045B is sourced from the original manufacturer or authorized distributors?
All STPS1045B 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 meets industry standards.
7.What is the process for return or replacement of STPS1045B?
All STPS1045B units undergo pre-shipment inspection (PSI). If there is an issue with STPS1045B, 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 part is unused and in its original packaging.
Return procedure for STPS1045B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS1045B Tags
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1N4148WX-TP
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BAV21W-7-F
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