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STMicroelectronics STPS4045CT
- Part No.:
- STPS4045CT
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
STPS4045CT.pdf
- Description:
- DIODE ARRAY SCHOT 45V 20A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:823
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Product details
Overview
STPS4045CT from STMicroelectronics is a dual center-tap Schottky rectifier in TO-220AB package, rated for 2 × 20 A average forward current per diode, 45 V repetitive peak reverse voltage, and 175 °C maximum junction temperature. It delivers low conduction losses (VF max 0.63 V at 125 °C, 20 A), negligible switching losses, and specified avalanche capability-ideal for high-frequency DC/DC converters and low-voltage inverters.
For engineers reviewing the STPS4045CT datasheet, STPS4045CT pinout, STPS4045CT application, or STPS4045CT equivalent, this device is selected for high-efficiency power conversion where thermal performance, fast recovery, and dual-diode symmetry in a center-tap configuration are critical-especially in SMPS secondary-side rectification and freewheeling paths.
Technical Context
This dual-diode Schottky rectifier integrates two identical anode-cathode-anode (A–K–A) structures sharing a common cathode terminal, enabling center-tap transformer secondary rectification without external node tying. Its monolithic construction ensures matched VF and thermal characteristics between diodes.
Designed for high-frequency operation, it exhibits extremely fast switching with no minority-carrier storage delay, dV/dt rating of 10,000 V/µs, and low junction-to-case thermal resistance (1.8 °C/W per diode in TO-220AB). Avalanche energy handling (6000 W peak, 1 µs) supports transient robustness in inductive load circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum reverse blocking voltage per diode; defines safe operating range in buck-derived topologies and flyback clamp circuits. |
| IF(AV) per diode | 20 A at TC = 145 °C, δ = 0.5 - Continuous DC output current capability per leg under heatsink-constrained conditions. |
| VF (max) | 0.63 V at Tj = 125 °C, IF = 20 A - Directly determines conduction loss: ~12.6 W total for both diodes at full load. |
| Rth(j-c) per diode | 1.8 °C/W - Enables thermal design with standard TO-220 heatsinks; 36 °C rise at 20 A per diode under worst-case conduction loss. |
| IFSM | 220 A (10 ms sinusoidal) - Supports surge tolerance during startup or overload in 48 V input DC/DC stages. |
| IRRM | 1 A at VR = VRRM, f = 1 kHz - Low leakage preserves efficiency in high-impedance bias networks and standby modes. |
| Tj(max) | 175 °C - Allows operation in sealed industrial enclosures with ambient up to ~100 °C when properly heatsinked. |
Pinout & Package
STPS4045CT uses the TO-220AB package: three leads in straight-line configuration, with metal tab (cathode) electrically connected to pin 2. Mounting hole accepts M3 screw; recommended torque 0.4–0.6 N·m.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode 1) | Anode of first Schottky diode | Connects to one end of center-tapped transformer secondary or split-rail inverter leg. |
| Pin 2 (Cathode) | Common cathode for both diodes | Electrically tied to metal tab; serves as output node for full-wave rectified DC; requires insulated mounting if chassis-ground referenced. |
| Pin 3 (Anode 2) | Anode of second Schottky diode | Connects to opposite end of center-tapped winding; phase-complementary to Pin 1 for alternating conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Very small conduction losses | VF ≤ 0.63 V @ 20 A, 125 °C enables >92% efficiency in 12 V output, 100 kHz DC/DC converters. |
| Negligible switching losses | No reverse recovery charge (Qrr ≈ 0) eliminates turn-off loss and EMI from diode ringing in hard-switched topologies. |
| Avalanche capability specified | 6000 W peak avalanche power (1 µs pulse) allows reliable operation during inductive switching transients without snubbers. |
| Low thermal resistance | 1.8 °C/W junction-to-case per diode permits use with compact extruded heatsinks in space-constrained 1U power supplies. |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant epoxy meets UL94 V0 flammability rating for industrial safety certification. |
Applications
| Server Power Supply Secondary Rectification | Industrial DC/DC Converter Freewheeling |
|---|---|
Use Scenario: 48 V input, 12 V/40 A output synchronous-buck-derived converter in 19-inch rack server PSU. IC Role / Device Role / Timing Role: Dual center-tap Schottky rectifier replacing synchronous MOSFETs in cost-sensitive designs; conducts during low-side switch off-time. Use Value: Reduces BOM count by eliminating gate drivers and current-sense resistors while maintaining <1.5 V output drop at full load. |
Use Scenario: 24 V DC bus feeding variable-speed motor drives with regenerative braking feedback. IC Role / Device Role / Timing Role: Freewheeling path for inductive load current during PWM off-cycle; handles bidirectional energy return. Use Value: Avalanche-rated structure absorbs 150 mJ inductive kickback without clamping diodes or TVS, simplifying PCB layout. |
| Solar Microinverter DC Link Protection | Telecom Rectifier Module Polarity Guard |
Use Scenario: String-level DC/AC conversion in shaded rooftop PV arrays with rapid voltage transients. IC Role / Device Role / Timing Role: Reverse-polarity protection and transient clamping on DC input side; blocks reverse current during partial shading faults. Use Value: 45 V VRRM withstands string open-circuit voltage spikes up to 60 V; 175 °C Tj supports unventilated outdoor enclosure mounting. |
Use Scenario: -48 V telecom rectifier shelf with hot-swap insertion and battery backup switchover. IC Role / Device Role / Timing Role: Polarity protection diode across input terminals; prevents damage from accidental reverse battery connection. Use Value: Dual-diode symmetry ensures equal forward drop in either polarity fault condition; TO-220AB mechanical robustness survives repeated hot-plug cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual center-tap Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-40CPH045 | Same 45 V VRRM, 2 × 20 A rating, but TO-247 package; Rth(j-c) = 1.5 °C/W per diode. | Better thermal performance but larger footprint; requires different heatsink interface and mounting hardware. | Select when thermal margin is constrained and board area permits TO-247 layout. |
| ON Semiconductor MBR4045CT | Identical TO-220AB package and pinout; VF max 0.72 V @ 125 °C, 20 A - 14% higher conduction loss. | Lower avalanche rating (no specified PARM); less robust under inductive switching stress. | Select only for cost-driven, non-avalanche-critical applications with derated current (<16 A per diode). |
Compared with VS-40CPH045 and MBR4045CT, STPS4045CT uniquely balances TO-220AB form factor, 0.63 V VF ceiling, and 6000 W avalanche rating-making it optimal for space-limited, thermally demanding, and transient-heavy industrial DC/DC designs.
Availability
STPS4045CT is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, and telecom rectifier modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for STPS4045CT 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
STPS4045CT belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-frequency, high-efficiency AC/DC and DC/DC conversion where low VF, fast switching, and rugged avalanche behavior are mandatory.
FAQ
Is STPS4045CT pin-compatible with MBR4045CT?
Yes-both use TO-220AB package with identical pin 1 (A1), pin 2 (K, common cathode), pin 3 (A2) assignment and mechanical dimensions. No PCB redesign is needed for direct replacement, though thermal and avalanche performance differences must be validated in-system.
What is the maximum continuous power dissipation per diode at 25 °C ambient?
At Tamb = 25 °C with adequate heatsinking (Rth(c-a) ≤ 1.0 °C/W), each diode can dissipate up to 12.2 W continuously-calculated from (Tj,max − Tamb)/Rth(j-a), where Rth(j-a) ≈ 12.2 °C/W per diode per datasheet Figure 2.
Does STPS4045CT require a heatsink in 20 A operation?
Yes-without a heatsink, junction temperature exceeds 175 °C within seconds at 20 A due to Rth(j-c) = 1.8 °C/W and conduction loss ≥12.6 W. A minimum 15 cm² aluminum heatsink (0.5 K/W) is required for sustained 20 A per diode operation at 50 °C ambient.
Can STPS4045CT be used in synchronous rectification topologies?
No-it is a passive Schottky rectifier, not a controlled switch. It cannot replace MOSFETs in synchronous rectification, which requires gate drive timing and active control. However, it serves as a robust, low-loss alternative where synchronous control complexity or cost is prohibitive.
STPS4045CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io) (per Diode):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 760 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 45 V
- Operating Temperature - Junction:
- 175°C (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
STPS4045CT FAQ
1.How can I place an order for STPS4045CT through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS4045CT 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 STPS4045CT reliable?
The price and inventory of STPS4045CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS4045CT is usually 5 days.
3.What payment methods are accepted for STPS4045CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS4045CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS4045CT?
STPS4045CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS4045CT 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 STPS4045CT?
For technical support, including STPS4045CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS4045CT requirements.
6.How does Aetrix verify that STPS4045CT is sourced from the original manufacturer or authorized distributors?
All STPS4045CT 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 STPS4045CT meets industry standards.
7.What is the process for return or replacement of STPS4045CT?
All STPS4045CT units undergo pre-shipment inspection (PSI). If there is an issue with STPS4045CT, 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 STPS4045CT part is unused and in its original packaging.
Return procedure for STPS4045CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS4045CT Tags
-
BAV99-7-F
Diodes Incorporated
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BAT54C-7-F
Diodes Incorporated
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BAV99,215
Nexperia USA Inc.
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BAT54SLT1G
onsemi
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BAV70LT1G
onsemi
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BAT54CLT1G
onsemi
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BAT54S-7-F
Diodes Incorporated
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BAV99LT1G
onsemi
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BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
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MMBD1503-TP
Micro Commercial Co
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BAV99WT1G
onsemi
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