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STMicroelectronics STPS1545CT
- Part No.:
- STPS1545CT
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
STPS1545CT.pdf
- Description:
- DIODE ARR SCHOTT 45V 7.5A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
STPS1545CT from STMicroelectronics is a dual center-tap Schottky rectifier in TO-220AB package, rated for 45 V reverse voltage and 2 × 7.5 A average forward current per diode, with typical forward voltage of 0.5 V at 125 °C and 7.5 A. It delivers negligible switching losses and avalanche capability, optimized for low-voltage, high-frequency DC-DC converters and free-wheeling in SMPS.
For engineers reviewing the STPS1545CT datasheet, STPS1545CT pinout, STPS1545CT application, or STPS1545CT equivalent, key selection criteria include conduction loss modeling (P = 0.42×IF(AV) + 0.020×IF²(RMS)), thermal coupling between diodes (Rth(c) = 0.35 °C/W), and junction-to-case thermal resistance (3.0 °C/W per diode).
Technical Context
This dual-diode Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal (center-tap configuration), enabling synchronous rectification or complementary freewheeling in half-bridge topologies. Its low VF and absence of minority-carrier storage eliminate reverse recovery charge, supporting operation above 500 kHz.
Thermal design requires explicit handling of inter-diode coupling: power dissipated in one diode raises the junction temperature of the other via Rth(c) = 0.35 °C/W, necessitating derating when both diodes conduct simultaneously under δ = 0.5 square-wave conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse blocking voltage per diode; defines safe operating limit in flyback or buck-boost clamp circuits. |
| IF(AV) | 2 × 7.5 A - Average forward current rating per diode at TC = 157 °C; sets continuous output current capability in dual-path SMPS designs. |
| VF (typ) | 0.5 V @ 125 °C, 7.5 A - Typical forward drop per diode; directly determines conduction loss (≈3.75 W per diode at full load). |
| Rth(j-c) | 3.0 °C/W per diode - Junction-to-case thermal resistance; used with heatsink Rth(c-a) to calculate max ambient temperature for thermal stability. |
| IFSM | 150 A @ 10 ms sinusoidal - Non-repetitive surge current rating; supports inrush and short-circuit transient tolerance in power supplies. |
| Tj (max) | +175 °C - Maximum junction temperature; enables high-temperature operation in enclosed industrial or automotive under-hood environments. |
Pinout & Package
STPS1545CT is housed in TO-220AB package with isolated metal tab (heatsink). Pin assignment is standardized across ST's dual-center-tap TO-220 rectifiers: Pin 1 = Anode 1, Pin 2 = Cathode (common center tap), Pin 3 = Anode 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (A1) | Anode of Diode 1 | Connects to high-side switch node in half-bridge or input rail in polarity protection; electrically isolated from tab. |
| Pin 2 (K) | Common Cathode (Center Tap) | Reference node for both diodes; must be routed with low-inductance path to ground or return rail in high-frequency layouts. |
| Pin 3 (A2) | Anode of Diode 2 | Connects to low-side switch node or secondary winding; shares thermal path with A1 via common die substrate. |
| Metal Tab | Electrically Isolated Heatsink | Not internally connected; must be mounted with insulating washer and torque-controlled to 0.55 N·m for optimal thermal transfer. |
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 in >300 kHz converters. |
| Avalanche capability specified | 190 W repetitive peak avalanche power @ 10 µs pulse, Tj = 125 °C; enables robustness against inductive kickback without external snubbers. |
| Very small conduction losses | VF = 0.5 V typ. @ 7.5 A/125 °C yields <4 W conduction loss per diode - critical for >90% efficiency in 3.3–12 V output rails. |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant epoxy; meets IPC-J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30 °C/60% RH). |
Applications
| Server VRM Power Stage | Industrial PLC DC-DC Module |
|---|---|
Use Scenario: High-current, low-voltage point-of-load regulation in x86 server voltage regulator modules delivering up to 100 A at 1.2 V. IC Role / Device Role / Timing Role: Dual-center-tap Schottky rectifier replacing synchronous MOSFETs in cost-sensitive, thermally constrained VRM phases. Use Value: Eliminates gate drive complexity and body diode conduction loss while maintaining <0.6 V total forward drop across both paths at full load. | Use Scenario: Isolated 24 V to 5 V/3.3 V DC-DC conversion in programmable logic controller backplanes with wide ambient temperature range (-40 to +70 °C). IC Role / Device Role / Timing Role: Freewheeling diode pair in active-clamp forward converter, handling 50–200 kHz switching frequency. Use Value: Enables stable operation at 125 °C junction temperature without derating, supported by 175 °C max Tj and validated thermal coupling model. |
| Automotive Body Control Unit | Telecom AC-DC Adapter |
Use Scenario: Reverse polarity protection and load dump clamping in 12 V automotive body control modules exposed to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Dual-anode protection rectifier with common cathode tied to battery rail, absorbing bidirectional transients. Use Value: Avalanche-rated 190 W pulse power withstands 12 V system load dump events without failure, verified per AEC-Q101 stress test conditions. | Use Scenario: Secondary-side rectification in compact 65 W telecom wall adapters operating at 100–150 kHz with tight EMI limits. IC Role / Device Role / Timing Role: Center-tapped output rectifier in forward converter topology, minimizing transformer turns ratio and leakage inductance. Use Value: Near-zero reverse recovery eliminates high-frequency ringing on transformer secondary, reducing need for RC snubbers and easing EMI filter design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-15BQ040PBF | Single-diode 40 V / 15 A Schottky; no center-tap configuration; VF = 0.52 V @ 15 A / 125 °C. | Requires two separate devices and external common-cathode routing; increases PCB area and parasitic inductance. | Select when discrete layout control is needed or when center-tap topology is not used. |
| ON Semiconductor MBR1645CT | 45 V / 2 × 8 A rating; VF = 0.62 V @ 8 A / 125 °C; Rth(j-c) = 2.5 °C/W per diode; TO-220AB package. | Slightly higher VF increases conduction loss by ~12% at full load; lower thermal resistance improves margin at high ambient. | Select when thermal headroom is prioritized over minimal voltage drop in space-constrained designs. |
Compared with VS-15BQ040PBF and MBR1645CT, STPS1545CT offers the lowest VF among TO-220AB dual Schottkys and integrated center-tap geometry-reducing layout complexity and improving high-frequency efficiency in tightly coupled dual-path topologies.
Availability
STPS1545CT is available at Aetrix Electronics and suitable for server VRM power stages, industrial PLC DC-DC modules, and automotive body control units requiring stable component supply and long-term production continuity.
Supply support for STPS1545CT 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 silicon solutions for automotive, industrial, and power management applications.
The STPS series targets high-efficiency, high-reliability power conversion with Schottky technology optimized for SMPS, DC-DC, and protection circuits where low VF and zero Qrr are mandatory.
FAQ
What is the maximum allowable case temperature for continuous operation?
The datasheet specifies IF(AV) = 7.5 A per diode at TC = 157 °C. Exceeding this temperature requires linear derating per Figure 2; at TC = 100 °C, maximum IF(AV) rises to ~10.5 A per diode. Thermal design must account for Rth(j-c) = 3.0 °C/W and inter-diode coupling (Rth(c) = 0.35 °C/W) to avoid thermal runaway.
Can STPS1545CT be used in parallel with another identical device to increase current capacity?
No-parallel operation is not recommended. The device lacks built-in current-sharing features, and mismatched VF between units causes uneven current distribution. For higher current, use a single higher-rated part (e.g., STPS20L45CG) or redesign with interleaved phases rather than paralleling TO-220AB packages.
Is the metal tab electrically connected to any internal terminal?
No-the TO-220AB metal tab is electrically isolated from all internal semiconductor terminals. It serves solely as a heatsink. Mounting requires an insulating thermal pad or mica washer; electrical isolation must be verified with ≥1 kV DC hipot test before system integration.
How does the 0.35 °C/W coupling resistance affect thermal design when both diodes are active?
When both diodes conduct simultaneously, power in Diode 2 raises Diode 1's junction temperature by ΔTj1 = P2 × Rth(c). For example, 5 W in Diode 2 adds 1.75 °C to Diode 1's junction temp-requiring combined thermal modeling using ΔTj1 = P1×Rth(j-c) + P2×Rth(c) and vice versa to ensure neither exceeds 175 °C.
STPS1545CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io) (per Diode):
- 7.5A
- Voltage - Forward (Vf) (Max) @ If:
- 570 mV @ 7.5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 45 V
- Operating Temperature - Junction:
- 175°C (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
STPS1545CT FAQ
1.How can I place an order for STPS1545CT through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1545CT 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 STPS1545CT reliable?
The price and inventory of STPS1545CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1545CT is usually 5 days.
3.What payment methods are accepted for STPS1545CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1545CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1545CT?
STPS1545CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1545CT 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 STPS1545CT?
For technical support, including STPS1545CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1545CT requirements.
6.How does Aetrix verify that STPS1545CT is sourced from the original manufacturer or authorized distributors?
All STPS1545CT 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 STPS1545CT meets industry standards.
7.What is the process for return or replacement of STPS1545CT?
All STPS1545CT units undergo pre-shipment inspection (PSI). If there is an issue with STPS1545CT, 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 STPS1545CT part is unused and in its original packaging.
Return procedure for STPS1545CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS1545CT Tags
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BAV99-7-F
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BAT54C-7-F
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BAV99,215
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BAT54S-7-F
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BAV99LT1G
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BAT54S,215
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