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STMicroelectronics STPS745FP
- Part No.:
- STPS745FP
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
STPS745FP.pdf
- Description:
- DIODE SCHOTT 45V 7.5A TO220FPAC
- Quantity:
- Payment:
- Shipping:
Inventory:90
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Product details
Overview
STPS745FP from STMicroelectronics is a 45 V, 7.5 A average forward current power Schottky rectifier in insulated TO-220FPAC package, designed for low-voltage, high-frequency DC/DC converters and SMPS free-wheeling paths. It delivers typ. 0.5 V forward voltage at 7.5 A and 125 °C, supports 150 A non-repetitive surge current, and features 2000 VRMS insulation rating and avalanche capability.
For engineers reviewing the STPS745FP datasheet, STPS745FP pinout, STPS745FP application, or STPS745FP equivalent, key selection criteria include thermal resistance (Rth(j-c) = 5.5 °C/W), conduction loss equation (P = 0.42×IF(AV) + 0.020×IF²(RMS)), and insulating package suitability for isolated secondary-side rectification in compact industrial power supplies.
Technical Context
This single-anode Schottky diode operates with negligible switching losses due to majority-carrier conduction and absence of minority-carrier storage delay. Its 175 °C maximum junction temperature and 5.5 °C/W junction-to-case thermal resistance enable reliable operation under forced-air or heatsink-cooled conditions in high-density power stages.
The TO-220FPAC package integrates an electrically insulated tab rated for 2000 VRMS, eliminating need for isolation washers in floating output configurations. Avalanche energy rating (190 W at 10 µs, Tj = 125 °C) provides robustness against inductive turn-off transients in freewheeling applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 3.3–24 V output rectification. |
| IF(AV) | 7.5 A at TC = 145 °C - Continuous forward current rating under specified case temperature; determines heatsink sizing. |
| VF (typ) | 0.5 V at IF = 7.5 A, Tj = 125 °C - Low conduction loss enables >92% efficiency in 12 V output buck converters. |
| Rth(j-c) | 5.5 °C/W - Junction-to-case thermal resistance; used with heatsink Rth(c-a) to calculate max ambient temperature. |
| IFSM | 150 A (tp = 10 ms, sinusoidal) - Surge current capability for startup inrush and transient overload protection. |
| Tj (max) | +175 °C - Maximum junction temperature; allows operation in high-ambient industrial environments with derating. |
| Insulation | 2000 VRMS - Reinforced isolation between tab and leads; eliminates need for insulating hardware in floating topologies. |
Pinout & Package
STPS745FP uses the TO-220FPAC package: a 3-lead, insulated-tab variant of TO-220 with plastic body and electrically isolated metal tab (rated 2000 VRMS). Mounting torque: 0.55 Nm recommended, 0.70 Nm maximum.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Current entry point | Connected to switching node (e.g., MOSFET drain) in synchronous or asynchronous buck/flyback secondary side. |
| Cathode (Lead 2) | Current exit point | Connected to output rail; carries full load current and must be routed with low-inductance layout. |
| Isolated Tab (Case) | Thermal path / electrical isolation barrier | Mounted directly to heatsink without insulator; provides thermal conduction while maintaining galvanic isolation from heatsink. |
Key Features
| Feature | Design Value |
|---|---|
| Extremely fast switching | No reverse recovery time (trr ≈ 0 ns); eliminates switching loss and EMI from minority-carrier tail current. |
| Negligible switching losses | Majority-carrier conduction only; enables >500 kHz operation without efficiency penalty. |
| Avalanche capability | 190 W peak avalanche power (10 µs pulse, Tj = 125 °C); withstands inductive kick during MOSFET turn-off. |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant molding compound; meets industrial environmental requirements without performance trade-off. |
| TO-220FPAC insulation | 2000 VRMS isolation between tab and leads; simplifies mechanical design in isolated DC/DC outputs. |
Applications
| Server VRM Output Rectification | Industrial DC/DC Converter Freewheeling |
|---|---|
Use Scenario: 12 V input to 1.2 V/100 A output VRM in rack-mounted servers. IC Role / Device Role / Timing Role: Secondary-side Schottky rectifier replacing synchronous MOSFETs where gate drive complexity is undesirable. Use Value: 0.5 V VF reduces conduction loss by ~30% vs. standard silicon diodes, lowering thermal load on compact heatsinks. |
Use Scenario: 48 V to 24 V isolated DC/DC module in PLC power supply. IC Role / Device Role / Timing Role: Freewheeling diode across primary-side transformer winding during MOSFET off-time. Use Value: 150 A IFSM handles worst-case inductive energy dump; 2000 VRMS insulation avoids creepage/clearance redesign. |
| Automotive Body Control Module Supply | Telecom PoE Midspan Rectification |
Use Scenario: 12 V battery-fed 5 V/3 A auxiliary supply in BCM with wide ambient (-40 to +105 °C). IC Role / Device Role / Timing Role: Output rectifier in flyback converter with variable load and cold-crank transients. Use Value: 175 °C Tj(max) ensures reliability at elevated under-hood temperatures; avalanche rating absorbs load-dump spikes. |
Use Scenario: 57 V PoE midspan injector delivering 30 W to remote IP camera over CAT5e. IC Role / Device Role / Timing Role: Secondary-side rectifier in active clamp forward topology operating at 250 kHz. Use Value: Near-zero trr prevents cross-conduction loss with clamp FET; 5.5 °C/W Rth(j-c) enables natural convection cooling. |
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-75SQ045 | Same VRRM (45 V), higher IF(AV) = 7.5 A @ TC = 150 °C; Rth(j-c) = 4.5 °C/W; no insulation rating. | Requires insulating washer for heatsink mounting; better thermal performance but adds assembly step and cost. | Select when heatsink isolation is handled externally and lower thermal resistance is critical. |
| ON Semiconductor SB745 | Same VRRM/IF(AV); TO-220AC (non-insulated); Rth(j-c) = 3.0 °C/W; no avalanche rating specified. | Cannot be mounted directly to grounded heatsink; lacks transient robustness for inductive loads. | Select for cost-sensitive, non-isolated, low-transient applications where thermal margin is ample. |
Compared with VS-75SQ045 and SB745, STPS745FP uniquely combines 2000 VRMS insulation, 175 °C rating, and documented avalanche capability-making it the only choice for space-constrained, isolated, high-reliability industrial DC/DC designs requiring zero external isolation hardware.
Availability
STPS745FP is available at Aetrix Electronics and suitable for server VRMs, industrial DC/DC converters, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for STPS745FP 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
STPS745FP belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space- and thermally-constrained applications where low VF and fast switching are critical.
FAQ
What is the maximum allowable case temperature for continuous operation?
The STPS745FP is rated for IF(AV) = 7.5 A at TC = 145 °C. Exceeding this temperature requires linear derating per the datasheet curve in Figure 2. At TC = 125 °C, IF(AV) increases to ~9.2 A; at TC = 100 °C, it reaches ~11.5 A. Thermal design must ensure TC remains ≤145 °C under worst-case ambient and airflow conditions.
Can STPS745FP replace a standard silicon rectifier in an existing 24 V SMPS design?
Yes-provided VRRM ≥ 45 V and peak reverse voltage does not exceed that limit. STPS745FP's lower VF (0.5 V vs. ~1.1 V for silicon) reduces conduction loss by ~55%, lowering output-stage temperature. However, its higher IR leakage at 125 °C (up to 15 mA) may affect light-load regulation in high-impedance feedback networks.
Is the TO-220FPAC tab electrically connected to any internal node?
No-the tab is fully insulated from both anode and cathode terminals. It serves solely as a thermal interface and is rated for 2000 VRMS isolation. Electrical connection to the tab is prohibited; it must be mounted to a heatsink without conductive paste bridging to leads.
Does STPS745FP require snubber circuitry in high-di/dt applications?
No snubber is required for typical operation due to zero reverse recovery charge (Qrr ≈ 0). However, in circuits with very high di/dt (>1000 A/µs) and long PCB traces, a small RC snubber (e.g., 10 Ω + 100 pF) across cathode-anode may suppress high-frequency ringing caused by parasitic inductance, improving EMI performance.
STPS745FP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-2 Full Pack
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io):
- 7.5A
- Voltage - Forward (Vf) (Max) @ If:
- 840 mV @ 15 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:
- Through Hole
- Supplier Device Package:
- TO-220FPAC
- Operating Temperature - Junction:
- 175°C (Max)
STPS745FP FAQ
1.How can I place an order for STPS745FP through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS745FP 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 STPS745FP reliable?
The price and inventory of STPS745FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS745FP is usually 5 days.
3.What payment methods are accepted for STPS745FP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS745FP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS745FP?
STPS745FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS745FP 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 STPS745FP?
For technical support, including STPS745FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS745FP requirements.
6.How does Aetrix verify that STPS745FP is sourced from the original manufacturer or authorized distributors?
All STPS745FP 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 STPS745FP meets industry standards.
7.What is the process for return or replacement of STPS745FP?
All STPS745FP units undergo pre-shipment inspection (PSI). If there is an issue with STPS745FP, 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 STPS745FP part is unused and in its original packaging.
Return procedure for STPS745FP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS745FP Tags
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