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Semtech Corporation SR2.8.TCT
- Part No.:
- SR2.8.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
SR2.8.TCT.pdf
- Description:
- TVS DIODE 2.8VWM 8.5VC SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:7,343
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Product details
Overview
SR2.8.TCT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping across full current and temperature range (−40°C to +125°C). It protects USB Type-C PD buses, load switch inputs, and industrial I/O interfaces using solid-state FET-based shunt architecture.
For engineers reviewing the SR2.8.TCT datasheet, pinout, applications, or equivalent options, key selection considerations include its constant-clamp behavior under surge stress, ultra-low dynamic resistance (20 mΩ), 175 pF junction capacitance at 22V, DFN 1.6×1.6×0.55 mm 6-lead package, and compatibility with industrial surge standards (±1kV, 1.2/50μs).
Technical Context
The SR2.8.TCT implements a precision-triggered, surge-rated FET as its primary protection element - unlike conventional TVS diodes, its clamping voltage remains nearly flat (27.5–28V) from 24A to 40A due to decreasing RDS(on) under increasing current. The trigger circuit activates the shunt FET when transient voltage exceeds ~27.9V breakdown, enabling low-impedance conduction to ground.
Its electrical architecture separates input (pins 4–6) and ground (pins 1–3) terminals, requiring all three pins per side to be connected for rated 40A performance. Thermal stability is inherent: clamping voltage drift is minimal over −40°C to +125°C, and peak pulse current capability remains consistent across operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - supports continuous operation on 20V USB PD bus and industrial 24V nominal systems without leakage or degradation. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage thresholds even under worst-case surge. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD endpoints. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD stages in high-reliability portable and IoT designs. |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - compatible with DC/low-speed power rails and load switch inputs; not suitable for >100 Mbps data lines. |
| Dynamic Resistance | 20 mΩ (8/20μs) - enables near-ideal shunt behavior, minimizing voltage overshoot during fast-rising transients. |
| Operating Temperature | −40°C to +125°C - supports deployment in automotive under-hood, industrial PLC, and outdoor IoT enclosures. |
Pinout & Package
SR2.8.TCT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six leads are surface-mount; marking includes "T22" code and date code. Tape-and-reel packaging supports automated assembly (3,000 units/reel, 7″ reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected with low-inductance vias to maximize 40A capability. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch VIN); all three pins are internally paralleled and must be shorted externally for full rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <0.5 V from 24A to 40A - eliminates design margin uncertainty seen with TVS diodes whose VC rises linearly with IPP. |
| FET-based shunt protection | Uses surge-rated MOSFET instead of PN-junction - avoids thermal runaway and enables stable performance up to +125°C junction. |
| Low dynamic resistance | 20 mΩ measured between 1A–40A - reduces IR drop during surge, preserving voltage integrity downstream of protection point. |
| High-energy surge rating | 1120 W peak pulse power (8/20μs) - sustains multi-kA-level induced surges common in industrial and PoE-powered systems. |
| Ultra-low leakage | 600 nA max reverse leakage at 22 V - prevents battery drain in always-on IoT nodes and maintains signal integrity on standby power rails. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V USB PD bus against lightning-induced surges and connector hot-plug ESD events. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed at Type-C connector, upstream of PD controller and load switch. Use Value: Maintains 27.5–28V clamp across temperature and current - prevents PD controller latch-up or gate oxide damage where TVS solutions exceed safe voltage margins. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) against 1.2/50μs surges in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage across load switch FET's drain-source during EOS events. Use Value: Keeps clamping voltage below 30V - avoids avalanche failure or gate-source overvoltage in integrated e-fuse ICs rated for ≤30V absolute maximum. |
| IoT Edge Node Power Rail Protection | Storage Device DC Power Input Protection |
Use Scenario: Securing 22V DC input of battery-backed smart sensors and wireless gateways exposed to field ESD and conducted noise. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge immunity on main power rail. Use Value: Delivers ±30kV contact ESD, ±4kV EFT, and 40A surge in one 1.6×1.6 mm footprint - eliminates stacking multiple protectors and saves PCB area. |
Use Scenario: Hardening 22V auxiliary supply lines of NVMe SSDs and enterprise HDD backplanes against system-level surges. IC Role / Device Role / Timing Role: Standoff protector for storage controller power domain, placed before bulk capacitance and LDOs. Use Value: Stable 27.5–28V clamping ensures downstream PMICs and flash controllers operate within safe SOA - no derating needed at high ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Identical electrical specs, same DFN 1.6×1.6 mm package, identical pinout and marking ("T22"); differs only in tape-and-reel packaging (3,000/reel vs. SR2.8.TCT's unspecified quantity). | Direct replacement in all PCB layouts and schematics; validated for USB Type-C, load switch, and industrial 22V rail use cases. | Select TDS2211P.C when standard Semtech reel packaging is preferred; SR2.8.TCT may reflect custom labeling or distribution channel variant. |
| SMAJ22A | Standard unidirectional TVS diode; 22V standoff, 35.5V min clamping at 12.5A (8/20μs); higher dynamic resistance (~0.5 Ω); clamping rises with current and temperature. | Limited to lower-energy transients; unsuitable for 40A surge or high-temp industrial environments where clamping stability is critical. | Use SMAJ22A only for cost-sensitive, non-critical 22V rails with <10A surge requirements and ambient <85°C. |
Compared with TDS2211P.C, SR2.8.TCT offers identical protection performance and layout compatibility; compared with SMAJ22A, SR2.8.TCT delivers 3.5× higher surge current rating, 25× lower dynamic resistance, and thermally stable clamping - making it essential for USB PD, industrial load switches, and high-reliability 22V systems.
Availability
SR2.8.TCT is available at Aetrix Electronics and suitable for USB Type-C PD endpoints, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed surge immunity compliance.
Supply support for SR2.8.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, protection, and signal integrity.
The TDS family - including SR2.8.TCT - was engineered specifically for high-energy EOS protection in next-generation power interfaces like USB PD and industrial 24V systems, replacing legacy TVS limitations with FET-based constant-clamp reliability.
FAQ
What is the exact package type and dimensions of SR2.8.TCT?
SR2.8.TCT uses a DFN (Dual Flat No-lead) package measuring 1.6 mm × 1.6 mm × 0.55 mm with six surface-mount terminals. Pins 1–3 are GND; pins 4–6 are IN. The package is Pb-free, halogen-free, and RoHS/WEEE compliant with UL 94V-0 molding compound. Pin 1 is marked by a laser dot.
Does SR2.8.TCT meet IEC 61000-4-5 surge immunity standards?
Yes, SR2.8.TCT is rated for 40A peak pulse current (8/20μs waveform) and ±1kV combination wave (1.2/50μs voltage, 8/20μs current, RS = 42Ω), satisfying IEC 61000-4-5 Level 4 for industrial environments. Its 27.5–28V clamping ensures protected circuits remain within safe operating area during full-rated surge events.
How does SR2.8.TCT differ from standard TVS diodes in clamping behavior?
Unlike TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SR2.8.TCT uses a triggered FET to maintain near-constant clamping (27.5–28V) from 24A to 40A. Its dynamic resistance is just 20 mΩ, versus typical TVS values >0.5 Ω - resulting in significantly lower voltage overshoot under surge stress.
Can SR2.8.TCT be used on high-speed data lines such as USB SuperSpeed or PCIe?
No, SR2.8.TCT is not suitable for high-speed data lines. Its 175 pF junction capacitance at 22V would severely degrade signal integrity above ~10 Mbps. It is intended exclusively for DC power rails and low-speed I/O (e.g., USB PD CC/SBU, load switch enable, industrial sensor power). For data lines, Semtech recommends RClamp3371ZC (<0.25 pF).
What is the maximum operating temperature and thermal derating profile of SR2.8.TCT?
SR2.8.TCT operates from −40°C to +125°C with no derating required. Clamping voltage remains stable across this range (±0.3 V variation), and peak pulse current capability holds at 40A. Junction temperature can reach +150°C, but sustained operation above +125°C ambient requires thermal analysis of PCB copper area and airflow.
SR2.8.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- TO-253-4, TO-253AA
- Series:
- RailClamp®, SR
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 2.8V (Max)
- Voltage - Breakdown (Min):
- 3V
- Voltage - Clamping (Max) @ Ipp:
- 8.5V
- Current - Peak Pulse (10/1000µs):
- 14A (8/20µs)
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 6pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143
SR2.8.TCT FAQ
1.How can I place an order for SR2.8.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for SR2.8.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 SR2.8.TCT reliable?
The price and inventory of SR2.8.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR2.8.TCT is usually 5 days.
3.What payment methods are accepted for SR2.8.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR2.8.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR2.8.TCT?
SR2.8.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR2.8.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 SR2.8.TCT?
For technical support, including SR2.8.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR2.8.TCT requirements.
6.How does Aetrix verify that SR2.8.TCT is sourced from the original manufacturer or authorized distributors?
All SR2.8.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 SR2.8.TCT meets industry standards.
7.What is the process for return or replacement of SR2.8.TCT?
All SR2.8.TCT units undergo pre-shipment inspection (PSI). If there is an issue with SR2.8.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 SR2.8.TCT part is unused and in its original packaging.
Return procedure for SR2.8.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SR2.8.TCT Tags
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