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Semtech Corporation SC1545CS-1.8TRT
- Part No.:
- SC1545CS-1.8TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Special Purpose Regulators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SC1545CS-1.8TRT.pdf
- Description:
- IC REG LDO CPU 1OUT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,678
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Product details
Overview
SC1545CS-1.8TRT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance at 22V - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the SC1545CS-1.8TRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, clamping stability across temperature and current, and direct alternatives for 22V bus protection with constant-voltage shunt FET architecture.
Technical Context
The SC1545CS-1.8TRT implements a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events above ~25V breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with stable clamping performance, low leakage (<600nA at 22V), and minimal temperature drift in breakdown voltage (25–27.9V typ), enabling reliable protection in thermally demanding industrial and mobile applications without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - supports continuous operation on 20V USB PD bus and industrial 24V nominal rails without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - holds protected ICs (e.g., USB PD controllers) safely below 30V damage thresholds even at max surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD endpoints. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external staging. |
| Dynamic Resistance | 20mΩ - enables low-voltage drop during conduction, minimizing power dissipation and thermal stress during repeated surges. |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with DC/low-speed power line protection; not suitable for >100MHz signal lines. |
| Reverse Leakage | ≤600nA at 22V - ensures negligible standby current impact on battery-powered IoT and portable devices. |
Pinout & Package
SC1545CS-1.8TRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no solder mask defined). All six terminals are surface-mount; pins require full connection per functional group for rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to minimize inductance and maximize 40A capability. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch input); parallel connection ensures uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A surge range - eliminates need for over-spec'ing IPP to meet voltage limits. |
| FET-based shunt protection | Surge energy diverted through low-RDS(on) channel instead of PN-junction - avoids thermal runaway and improves lifetime reliability. |
| Temperature-stable clamping | Clamps at 27.5–28V from –40°C to +125°C - removes thermal derating calculations required for standard TVS diodes. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - reduces voltage overshoot during fast-rising transients (e.g., ESD) and lowers joule heating. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive burst noise in motor drives and PLC environments. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V USB PD bus lines against lightning-induced surges and connector hot-plug ESD events. IC Role / Device Role / Timing Role: Primary shunt protector placed directly at Type-C receptacle, clamping transients before reaching PD controller and power MUX. Use Value: Maintains 27.5V clamping at 40A and 125°C - prevents controller latch-up or gate oxide damage where standard TVS would exceed 35V. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) against 1kV/42Ω surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by internal FET's drain-source rating during surge events. Use Value: Keeps clamp voltage below 28V across full temperature range - avoids overvoltage failure of load switch's integrated MOSFET. |
| IoT Edge Node Power Bus Protection | Tablet/Notebook VBUS Line Protection |
|
Use Scenario: Securing 12–24V DC input rails in battery-backed smart sensors exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV designs, reducing BOM count and PCB area. Use Value: 175pF capacitance and <600nA leakage enable compatibility with low-power sleep modes and long-term field deployment. |
Use Scenario: Protecting VBUS routing on thin-form-factor tablets and 2-in-1 notebooks where board space and thermal margin are constrained. IC Role / Device Role / Timing Role: Compact DFN-6 device mounted adjacent to USB-C port to minimize trace inductance and improve ESD response time. Use Value: 1.6mm × 1.6mm footprint saves >60% area vs. SO-8 TVS solutions while delivering superior clamping consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, same DFN-6 package, identical marking code "T22" - confirmed pin-to-pin and functionally equivalent per Semtech documentation. | No difference; validated for identical use cases including USB PD, load switch input, and industrial 22V bus protection. | Select TDS2211P when sourcing from distributors carrying Semtech's standard part numbering; identical performance and layout. |
| uClamp2411ZA | 24V working voltage, lower 30A IPP rating, higher 32V clamping at 30A, and 12pF capacitance - optimized for CC/SBU lines, not power rails. | Designed for low-capacitance data-line protection (CC, SBU), not high-current VBUS or load switch inputs. | Not interchangeable; uClamp2411ZA lacks surge robustness and clamping stability needed for SC1545CS-1.8TRT's power-line role. |
Compared with TDS2211P, SC1545CS-1.8TRT offers identical protection performance and drop-in compatibility; versus uClamp2411ZA, it delivers 33% higher surge rating and 4V lower clamping - making it the only validated option for 22V power rail EOS suppression.
Availability
SC1545CS-1.8TRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, consistent clamping behavior, and compact DFN packaging.
Supply support for SC1545CS-1.8TRT 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
SC1545CS-1.8TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 20–24V power rail protection with constant-voltage FET-based clamping.
FAQ
What is the maximum operating temperature for SC1545CS-1.8TRT?
The SC1545CS-1.8TRT is rated for continuous operation from –40°C to +125°C ambient. Its clamping voltage remains stable within 27.5–28V across this full range, and junction temperature is limited to +150°C per absolute maximum ratings. This makes SC1545CS-1.8TRT suitable for under-hood automotive modules and industrial control cabinets without thermal derating.
Does SC1545CS-1.8TRT require a thermal pad or heatsink?
No, SC1545CS-1.8TRT does not require an external thermal pad or heatsink. Its DFN-6 package dissipates surge energy via the internal FET channel and ground plane connections; the datasheet explicitly states no thermal pad is needed. Proper PCB layout - including multiple vias from GND pins (1,2,3) to inner ground layers - is sufficient for 40A surge handling.
Can SC1545CS-1.8TRT protect high-speed data lines like USB SuperSpeed?
No, SC1545CS-1.8TRT is not suitable for USB SuperSpeed (SS), DP, or DM lines due to its 175pF junction capacitance at 22V, which would severely degrade signal integrity above ~100MHz. It is intended exclusively for DC or low-frequency power and control lines. For SS lines, Semtech recommends RClamp3371ZC (0.25pF) alongside SC1545CS-1.8TRT in full USB-C protection schemes.
Is SC1545CS-1.8TRT compliant with RoHS and halogen-free standards?
Yes, SC1545CS-1.8TRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free per JEDEC J-STD-020. These compliance attributes are documented in the official Semtech TDS2211P datasheet, which applies identically to SC1545CS-1.8TRT.
How does SC1545CS-1.8TRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes - whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN) - SC1545CS-1.8TRT uses a triggered FET to maintain near-constant clamping (27.5–28V) from 24A to 40A. This eliminates the need to overspecify IPP just to meet voltage limits and ensures predictable protection across temperature and surge magnitude.
SC1545CS-1.8TRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- SmartLDO™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- LDO (Linear), CPU Motherboard
- Voltage - Input:
- 5V, 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 1.8V
- Operating Temperature:
- -40°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SC1545CS-1.8TRT FAQ
1.How can I place an order for SC1545CS-1.8TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC1545CS-1.8TRT 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 SC1545CS-1.8TRT reliable?
The price and inventory of SC1545CS-1.8TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC1545CS-1.8TRT is usually 5 days.
3.What payment methods are accepted for SC1545CS-1.8TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC1545CS-1.8TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC1545CS-1.8TRT?
SC1545CS-1.8TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC1545CS-1.8TRT 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 SC1545CS-1.8TRT?
For technical support, including SC1545CS-1.8TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC1545CS-1.8TRT requirements.
6.How does Aetrix verify that SC1545CS-1.8TRT is sourced from the original manufacturer or authorized distributors?
All SC1545CS-1.8TRT 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 SC1545CS-1.8TRT meets industry standards.
7.What is the process for return or replacement of SC1545CS-1.8TRT?
All SC1545CS-1.8TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC1545CS-1.8TRT, 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 SC1545CS-1.8TRT part is unused and in its original packaging.
Return procedure for SC1545CS-1.8TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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