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Semtech Corporation UCLAMP2804L.TCT
- Part No.:
- UCLAMP2804L.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCLAMP2804L.TCT.pdf
- Description:
- TVS DIODE 2.8VWM 10VC 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,310
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Product details
Overview
UCLAMP2804L.TCT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS/ESD protection of single 28V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 28V clamping voltage at 40A, and DFN-6 (1.6×1.6mm) package - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the UCLAMP2804L.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and surge current, low dynamic resistance (<25 mΩ), junction capacitance (≤200 pF), and compatibility with 28V bus systems requiring robust lightning/ESD immunity per IEC 61000-4-5.
Technical Context
The UCLAMP2804L.TCT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.6–28 V) from 24A to 40A peak pulse current due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C, maintains stable clamping across temperature (±0.2 V variation), and achieves <200 pF capacitance at 28V reverse bias - enabling use on high-speed 28V power rails without signal integrity degradation. Its six-terminal DFN layout separates three parallel input pins (4–6) and three ground pins (1–3) to minimize parasitic inductance during high-di/dt transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 28 V - supports continuous operation on 24–28V nominal power buses including USB PD 3.0 extended power range. |
| Clamping Voltage | 28 V at 40A (8/20μs) - limits transient overvoltage to safe levels for downstream 30V-rated load switches and PMICs. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity (±1 kV, 42Ω source) for industrial equipment. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD staging in handheld and docking interfaces. |
| Dynamic Resistance | 20 mΩ - ensures minimal voltage rise under high-current surges, critical for protecting low-voltage gate drivers. |
| Junction Capacitance | 175 pF @ 22V - compatible with 28V bus protection without degrading rise time of control signals or power sequencing. |
Pinout & Package
UCLAMP2804L.TCT is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with UL 94V-0 molding compound. The package features exposed thermal pad (not electrically connected) and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Three dedicated ground terminals - must be connected in parallel to minimize ground loop inductance and maximize 40A surge current handling. |
| 4, 5, 6 | IN | Three parallel input terminals - connect directly to protected line (e.g., VBUS in USB-C); all three required for full 40A rating and optimal clamping consistency. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.4 V across 24–40A surge range - avoids overvoltage failure of downstream 30V-rated ICs under worst-case surge. |
| Low dynamic resistance | 20 mΩ enables <0.8 V additional drop at 40A - preserves voltage margin for sensitive 28V logic and analog circuitry. |
| Temperature-stable clamping | Clamps at 27.6–28 V from –40°C to +125°C - eliminates derating calculations for industrial ambient conditions. |
| High-energy surge capability | 1120 W peak pulse power (8/20μs) - sustains repeated lightning-induced transients without parametric shift or failure. |
| Low leakage & capacitance | 600 nA max IR at 28V and 175 pF at 22V - prevents standby power loss and signal distortion on always-on 28V rails. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
|
Use Scenario: Protecting 20–28V VBUS lines in USB-C receptacles against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and load switch input, activated within nanoseconds of overvoltage detection. Use Value: Maintains 28V clamping at full 40A surge - prevents damage to USB PD controllers and e-fuses rated for ≤30V absolute maximum. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., TPS25982, MPQ5072) in remote meters and robotics. IC Role / Device Role / Timing Role: First-line transient diverter upstream of the load switch FET, limiting drain-source voltage during surge events. Use Value: Keeps VDS below 30V during 40A transients - avoids avalanche failure and gate oxide stress in integrated power switches. |
| IoT Edge Node Power Bus Protection | 28V DC Power Distribution in Embedded Systems |
|
Use Scenario: Securing 24–28V auxiliary power inputs in battery-backed IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone transient suppressor on main DC input rail, operating independently of system controller or PMIC. Use Value: Delivers ±30kV ESD immunity and 40A surge handling without external bias or control - reduces BOM count and layout complexity. |
Use Scenario: Protecting 28V distributed power rails in medical monitors and test equipment where reliability is mission-critical. IC Role / Device Role / Timing Role: Low-capacitance, high-power clamping device placed at board edge before bulk capacitance and LDOs. Use Value: Limits transient overshoot to ≤28V while adding only 175 pF - avoids resonance with input filter capacitors and maintains PSRR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2811P | Same 28V working voltage, identical DFN-6 package, but rated for 30A (8/20μs) and 28V clamping at 30A - lower peak pulse power (840W vs. 1120W). | Suitable for cost-sensitive designs where 30A surge immunity suffices and 40A headroom is not required. | Select TDS2811P if system-level surge testing confirms ≤30A requirement and PCB space constraints match. |
| SM712-TR | TVS diode array with 12V/7V dual-rail clamping, 1500W peak power, but higher clamping (≥33V at 25A) and fixed RDYN - no constant-clamp behavior. | Used in RS-485/RS-232 data line protection, not optimized for 28V power rail clamping stability. | Choose SM712-TR only for legacy designs requiring dual-rail protection or where FET-based TDS architecture is not approved. |
Compared with TDS2811P and SM712-TR, UCLAMP2804L.TCT delivers superior clamping consistency (±0.2 V across 24–40A), higher surge endurance (40A vs. 30A), and lower dynamic resistance (20 mΩ vs. >100 mΩ in TVS), making it optimal for 28V power rail protection where voltage margin and thermal stability are critical.
Availability
UCLAMP2804L.TCT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, IoT edge node power supplies, and 28V embedded power distribution requiring stable component supply and long-term lifecycle support.
Supply support for UCLAMP2804L.TCT 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 high-performance analog and mixed-signal ICs for precision sensing, power management, and transient protection.
UCLAMP2804L.TCT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 24–30V power rail protection with constant-clamp FET-based architecture.
FAQ
What is the maximum continuous operating voltage for UCLAMP2804L.TCT?
The UCLAMP2804L.TCT has a reverse stand-off voltage (VRWM) of 28 V, meaning it can continuously block up to 28 V DC without conduction. This makes UCLAMP2804L.TCT ideal for 24V and 28V nominal power rails such as USB PD 3.0 extended range and industrial 28V DC distribution systems.
How does UCLAMP2804L.TCT achieve constant clamping voltage across surge current?
UCLAMP2804L.TCT uses a surge-rated FET activated by an internal precision trigger circuit. As surge current increases, the FET's RDS(on) decreases, maintaining clamping voltage near 28 V from 24A to 40A (8/20μs). This behavior is confirmed in the UCLAMP2804L.TCT datasheet Figure 3 and differs fundamentally from voltage-dependent TVS diodes.
Can UCLAMP2804L.TCT be used on high-speed signal lines like USB SuperSpeed?
No - UCLAMP2804L.TCT has 175 pF junction capacitance, which is too high for USB 3.x SuperSpeed (TX/RX) lines requiring <0.3 pF. It is intended for 28V power or low-speed control lines (e.g., CC, SBU, enable). For data lines, Semtech recommends RClamp3371ZC (0.15 pF) alongside UCLAMP2804L.TCT in full USB-C protection schemes.
What is the recommended PCB layout for optimal performance of UCLAMP2804L.TCT?
Place UCLAMP2804L.TCT as close as possible to the protected connector. Connect all three IN pins (4–6) via a single short, wide trace to the protected line, and tie all three GND pins (1–3) directly to a solid ground plane using multiple vias. Avoid stubs or splits - this layout minimizes inductance and ensures UCLAMP2804L.TCT delivers full 40A surge capability.
Is UCLAMP2804L.TCT compliant with environmental and safety standards?
Yes - UCLAMP2804L.TCT is Pb-free, halogen-free, and RoHS/WEEE compliant. Its DFN package carries UL 94V-0 flammability rating, and it meets IEC 61000-4-2 (±30kV ESD), IEC 61000-4-4 (±4kV EFT), and IEC 61000-4-5 (40A 8/20μs surge) requirements as verified in the official UCLAMP2804L.TCT datasheet.
UCLAMP2804L.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- uClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 2.8V (Max)
- Voltage - Breakdown (Min):
- 3.5V
- Voltage - Clamping (Max) @ Ipp:
- 10V
- Current - Peak Pulse (10/1000µs):
- 10A (8/20µs)
- Power - Peak Pulse:
- 100W
- Power Line Protection:
- No
- Applications:
- Ethernet
- Capacitance @ Frequency:
- 6pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UCLAMP2804L.TCT FAQ
1.How can I place an order for UCLAMP2804L.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCLAMP2804L.TCT 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 UCLAMP2804L.TCT reliable?
The price and inventory of UCLAMP2804L.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCLAMP2804L.TCT is usually 5 days.
3.What payment methods are accepted for UCLAMP2804L.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCLAMP2804L.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCLAMP2804L.TCT?
UCLAMP2804L.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCLAMP2804L.TCT 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 UCLAMP2804L.TCT?
For technical support, including UCLAMP2804L.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCLAMP2804L.TCT requirements.
6.How does Aetrix verify that UCLAMP2804L.TCT is sourced from the original manufacturer or authorized distributors?
All UCLAMP2804L.TCT 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 UCLAMP2804L.TCT meets industry standards.
7.What is the process for return or replacement of UCLAMP2804L.TCT?
All UCLAMP2804L.TCT units undergo pre-shipment inspection (PSI). If there is an issue with UCLAMP2804L.TCT, 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 UCLAMP2804L.TCT part is unused and in its original packaging.
Return procedure for UCLAMP2804L.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCLAMP2804L.TCT Tags
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