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Semtech Corporation SM40
- Part No.:
- SM40
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
SM40.pdf
- Description:
- DIODE GEN PURP 4KV 300MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,609
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Product details
Overview
TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated I/O or power 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 - deployed in USB Type-C PD bus protection and industrial load switch input stages.
For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for flat VC vs. IPP behavior, DFN-6 package layout constraints, and compatibility with 22V working voltage systems requiring robust surge immunity per IEC 61000-4-5.
Technical Context
The TDS2211P uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and drives the shunt FET into low-RDS(on) conduction. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing FET on-resistance under surge conditions.
It operates across –40°C to +125°C with stable clamping performance, exhibits only 130–600nA reverse leakage at 22V, and delivers 1120W peak pulse power handling. The device's 175pF capacitance at 22V/1MHz and 0.5V forward voltage support integration in high-speed data line protection schemes where capacitive loading must be tightly controlled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, RS=2Ω) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - supports compliance with IEC 61000-4-5 Level 4 (±1kV, RS=42Ω, CS=0.5μF) on unsymmetrical lines. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds industrial and consumer ESD immunity requirements for connector-facing protection. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs) - enables near-constant clamping by minimizing I×R contribution across full surge range. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for placement on 20V power rails without compromising transient response or signal integrity. |
| Package | DFN 1.6mm × 1.6mm × 0.55mm, 6-lead - enables ultra-compact PCB layout adjacent to USB-C connectors or load switch inputs. |
Pinout & Package
Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), RoHS-compliant, Pb-free, UL 94V-0 molding compound, marked "T22" + date code, supplied in tape-and-reel (3,000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus or load switch VIN); parallel connection of all three pins required for full 40A rating and optimal thermal/current distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A - eliminates need for derating at high ambient temperatures or high-surge scenarios. |
| FET-based shunt topology | 20mΩ dynamic resistance enables <1V total voltage rise above trigger point - outperforms silicon avalanche TVS diodes in energy diversion efficiency. |
| Temperature-stable protection | Clamping remains 27.5–28V from –40°C to +125°C - removes thermal design uncertainty in industrial or automotive under-hood applications. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated surge events without parameter drift or bond-wire fusing. |
| Low-leakage standby | ≤600nA at 22V - prevents battery drain in always-on IoT or portable equipment with 22V auxiliary rails. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the VBus line of a USB-C port supporting up to 20V/5A PD negotiation against lightning-induced surges and connector ESD. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed directly at the connector, clamping transients before they reach the PD controller or buck converter. Use Value: Maintains 27.5V clamping at 40A and 125°C - keeps PD controller gate oxide stress within safe margin while enabling smaller heatsinking than TVS alternatives. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., HS2950P) exposed to 42V supply rails and field wiring transients. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by the load switch's internal FET during 1kV/42Ω surge events. Use Value: Prevents gate-oxide breakdown and latch-up in the load switch by holding clamp voltage 3–4V below its absolute maximum rating under worst-case surge and temperature. |
| IoT Edge Node Power Rail Protection | Robotic Actuator Control Board Input Stage |
|
Use Scenario: Securing 22V auxiliary power input on battery-backed smart sensors deployed in unshielded outdoor enclosures. IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input rail, coordinated with upstream fuse and downstream LDO. Use Value: 130nA max leakage at 25°C extends battery life; 175pF capacitance avoids interaction with 100kHz switching regulators feeding MCU subsystems. |
Use Scenario: Shielding motor driver power inputs from back-EMF spikes and ESD during hot-plug maintenance of robotic joint modules. IC Role / Device Role / Timing Role: Fast-acting shunt element triggered within nanoseconds of overvoltage detection, routing >95% of surge energy to chassis ground. Use Value: 20mΩ RDYN ensures <100ns response-to-clamp time - critical for preventing latch-up in half-bridge gate drivers during rapid dV/dt events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NUP4201MR6T1G | 6-pin SOT-563 TVS array; 24V VRWM; 33V clamping at 24A; 350pF typical capacitance; no FET-based constant-clamp architecture. | Higher clamping voltage (+5V), higher capacitance (+175pF), and temperature-dependent VC limit suitability to lower-speed 22V rails only. | Select when cost sensitivity outweighs clamping precision and board space is not constrained. |
| Vishay SMAJ22A | DO-214AC TVS diode; 22V VRWM; 35.5V clamping at 24A; 1000pF capacitance; junction-limited thermal mass. | Clamping rises >6V across 24–40A range and degrades >3V from –40°C to +125°C - insufficient for 24V system margins. | Choose only for non-critical 22V supply lines where 35.5V clamping is acceptable and layout allows larger footprint. |
Compared with NUP4201MR6T1G and SMAJ22A, the TDS2211P delivers superior clamping stability, lower dynamic impedance, and smaller footprint - making it the preferred choice for space-constrained, thermally aggressive, or safety-critical 22V EOS protection where consistent voltage limiting is mandatory.
Availability
TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch input protection, and IoT edge node power rail hardening requiring stable component supply and long-term lifecycle assurance.
Supply support for TDS2211P 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 semiconductors for power management, protection, and signal integrity.
The TDS family was engineered specifically to replace conventional TVS diodes in high-reliability 20–30V EOS applications, delivering flat clamping via active FET shunting - targeting USB-C, industrial automation, and ruggedized portable electronics.
FAQ
What is the maximum continuous operating voltage for the TDS2211P?
The TDS2211P has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC or RMS without significant leakage. This makes it suitable for 20V USB PD bus and 22V industrial auxiliary rails. Exceeding 22V risks premature triggering or accelerated degradation. The TDS2211P is rated for operation from –40°C to +125°C at this voltage level.
How does the TDS2211P achieve constant clamping voltage across surge current?
The TDS2211P uses a precision trigger circuit to activate a surge-rated FET, whose RDS(on) decreases as surge current increases - counteracting the I×R term in clamping voltage. This results in 27.5–28V clamping from 24A to 40A (8/20μs). Unlike TVS diodes, the TDS2211P's clamping remains stable across temperature, verified from –40°C to +125°C in datasheet Figure 3.
Can the TDS2211P be used on high-speed data lines like USB SS or PCIe?
No - the TDS2211P is not intended for high-speed signal lines. Its 175pF junction capacitance would severely degrade signal integrity on SuperSpeed (5–10 Gbps) or PCIe lanes. It is designed exclusively for power or low-speed control lines (e.g., VBus, CC, SBU, or load switch inputs). For data lines, Semtech recommends RClamp3371ZC (<0.25pF) alongside the TDS2211P in full USB-C protection schemes.
What PCB layout practices are critical for optimal TDS2211P performance?
All three IN pins (4,5,6) and all three GND pins (1,2,3) must be short, low-inductance connections - ideally via direct copper pours and multiple vias to inner ground planes. Place the TDS2211P within 3mm of the protected connector. Avoid stub traces or splits in GND paths. The device dissipates energy internally; no thermal pad is needed, but copper area under the package aids heat spreading during repetitive surges.
Is the TDS2211P compliant with RoHS and halogen-free standards?
Yes - the TDS2211P 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 matte tin. Marking code "T22" plus date code appears on the top surface, with a laser dot indicating Pin 1 location. Tape-and-reel packaging follows standard EIA-481 specifications.
SM40 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 4000 V
- Current - Average Rectified (Io):
- 300mA
- Voltage - Forward (Vf) (Max) @ If:
- 10 V @ 100 mA
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2.5 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 4000 V
- Capacitance @ Vr, F:
- 3.2pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -65°C ~ 175°C
SM40 FAQ
1.How can I place an order for SM40 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM40 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 SM40 reliable?
The price and inventory of SM40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM40 is usually 5 days.
3.What payment methods are accepted for SM40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM40?
SM40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM40 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 SM40?
For technical support, including SM40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM40 requirements.
6.How does Aetrix verify that SM40 is sourced from the original manufacturer or authorized distributors?
All SM40 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 SM40 meets industry standards.
7.What is the process for return or replacement of SM40?
All SM40 units undergo pre-shipment inspection (PSI). If there is an issue with SM40, 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 SM40 part is unused and in its original packaging.
Return procedure for SM40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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