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Semtech Corporation SM25
- Part No.:
- SM25
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
SM25.pdf
- Description:
- DIODE GEN PURP 2.5KV 600MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,448
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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 input protection and industrial load switch front-end circuits.
For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp behavior across temperature and current, FET-based shunt architecture versus conventional TVS diodes, DFN 1.6×1.6mm 6-lead layout constraints, and compatibility with 22V bus systems requiring robust ±1kV surge (IEC 61000-4-5) compliance.
Technical Context
The TDS2211P uses a surge-rated MOSFET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and drives the FET into low-RDS(on) conduction. This architecture delivers near-constant clamping voltage independent of peak pulse current magnitude or operating temperature.
Unlike conventional TVS diodes whose clamping voltage rises linearly with IPP (VC = VBR + IPP × RDYN), the TDS2211P maintains clamping at ~27.6–28V from 24A to 40A (1.2/50μs + 8/20μs combo wave) and across –40°C to +125°C, due to decreasing RDS(on) under surge conditions.
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 | 27.6–28V at 40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - ensures downstream 22V-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) on unsymmetrical lines. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds industrial and consumer interface ESD requirements without derating. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs) - enables stable clamping and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V, 1MHz - suitable for <22V power rail and moderate-speed signal line protection (not high-speed USB SS or PCIe). |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish, tape-and-reel (3,000 pcs/reel). Pin 1 marked with laser dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to minimize inductance and maximize 40A capability. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus, load switch input); parallel connection required to distribute surge current and reduce trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Replaces traditional TVS diode with low-RDS(on) MOSFET, enabling flat clamping response unaffected by temperature or current magnitude. |
| Constant clamping across IPP | Clamping voltage varies only 0.4V from 24A to 40A - eliminates need for oversized IPP margin to meet voltage safety limits. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - sustains 40A surges without thermal runaway or parametric shift. |
| Low dynamic resistance | 20mΩ ensures minimal IR drop during surge, preserving voltage headroom for downstream 22V-rated components. |
| Industrial temperature range | Operates from –40°C to +125°C with no clamping voltage drift - validated for automotive-adjacent and industrial embedded environments. |
Applications
| USB Type-C Power Delivery Protection | Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBus lines in USB Type-C receptacles supporting up to 20V PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end EOS suppressor placed between connector and PD controller/load switch, clamping transients before they reach sensitive silicon. Use Value: Maintains 27.6V clamping at 40A and 125°C - prevents overvoltage damage to 22V-rated PD controllers where conventional TVS would exceed 38V at same conditions. |
Use Scenario: Shielding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes. IC Role / Device Role / Timing Role: High-current shunt protector that diverts surge energy away from the load switch's internal FET drain-source path. Use Value: Keeps clamping voltage below the load switch's absolute maximum VDS rating, preventing gate oxide stress or avalanche failure during 1kV surge events. |
| Industrial Equipment Power Rails | Notebook/Tablet DC Input Protection |
Use Scenario: Safeguarding 22V auxiliary power rails in programmable logic controllers (PLCs), HMI panels, and factory automation modules. IC Role / Device Role / Timing Role: Standalone EOS suppressor on unregulated 22V supply inputs subject to cable discharge, relay switching noise, and EFT bursts. Use Value: Delivers ±4kV EFT immunity (IEC 61000-4-4) and stable clamping across –40°C to +125°C - ensures reliability in wide-temperature industrial enclosures. |
Use Scenario: Securing 20V-class DC input jacks in ultrabooks and tablets against user-handled ESD and accidental AC adapter surges. IC Role / Device Role / Timing Role: Compact, low-profile protector mounted adjacent to barrel jack or USB-C port to minimize PCB trace inductance. Use Value: 1.6×1.6mm DFN footprint saves >60% board area vs. SOT-23 TVS solutions while delivering higher surge robustness and lower clamping variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A (8/20μs); clamping rises with temperature and current. | Limited to lower-energy surges; not recommended for 40A or high-temp industrial use where flat clamping is critical. | Select SMAJ22A only for cost-sensitive, low-surge applications where 35.5V clamping is acceptable and ambient temperature stays ≤85°C. |
| TPD2E007DRYR | Low-capacitance (1.5pF) dual-channel ESD protector; 22V VRWM, 12A IPP; optimized for data lines, not power rails. | Designed for USB 2.0/DP/DM lines - insufficient peak current rating and thermal mass for VBus or load switch protection. | Use TPD2E007DRYR for secondary signal-line ESD protection alongside TDS2211P, not as a replacement for primary power rail suppression. |
Compared with SMAJ22A and TPD2E007DRYR, the TDS2211P uniquely combines 40A surge handling, 27.6V flat clamping across temperature, and FET-based architecture - making it the only option qualified for 22V power rail protection in USB PD, industrial load switches, and high-reliability 22V systems.
Availability
TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
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, sensing, and connectivity.
The TDS family was engineered specifically to replace conventional TVS diodes in high-energy EOS applications, delivering superior clamping stability, temperature resilience, and surge survivability for 12–36V industrial, computing, and USB infrastructure systems.
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 withstand up to 22V DC or RMS on its IN pins relative to GND without significant leakage or degradation. This makes the TDS2211P suitable for protecting 22V-rated power rails and USB PD VBus lines where nominal voltage reaches 20V.
How does the TDS2211P achieve constant clamping voltage across varying surge currents?
The TDS2211P achieves constant clamping by using a surge-rated MOSFET as its main protection element. When triggered, the FET enters a low-RDS(on) state (<20mΩ), causing clamping voltage to converge near the trigger circuit's breakdown voltage (~27.6V) regardless of whether the surge current is 24A or 40A - unlike TVS diodes whose VC increases linearly with IPP.
Can the TDS2211P be used to protect high-speed data lines like USB SuperSpeed?
No - the TDS2211P is not suitable for USB SuperSpeed (SS), PCIe, or other high-speed differential data lines due to its 175pF junction capacitance, which would severely degrade signal integrity. It is intended for 22V power rails and moderate-speed control lines; for SS lines, low-capacitance devices like RClamp3371ZC (<0.25pF) should be used alongside the TDS2211P.
What is the recommended PCB layout for optimal performance of the TDS2211P?
Place the TDS2211P as close as possible to the protected connector. Connect all three IN pins (4,5,6) via a single short, wide trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using multiple vias. Avoid thermal pads - energy is dissipated in the silicon, not the package - and minimize trace inductance to preserve 40A surge capability.
Does the TDS2211P require external biasing or control signals to operate?
No - the TDS2211P is fully passive and requires no external power, enable signals, or configuration. Its internal trigger circuit automatically activates the shunt FET when input voltage exceeds the breakdown threshold (~25–27.9V), making the TDS2211P a drop-in, zero-footprint solution for existing 22V protection designs.
SM25 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):
- 2500 V
- Current - Average Rectified (Io):
- 600mA
- Voltage - Forward (Vf) (Max) @ If:
- 5 V @ 250 mA
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2.5 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 2500 V
- Capacitance @ Vr, F:
- 8pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -65°C ~ 175°C
SM25 FAQ
1.How can I place an order for SM25 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM25 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 SM25 reliable?
The price and inventory of SM25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM25 is usually 5 days.
3.What payment methods are accepted for SM25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM25?
SM25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM25 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 SM25?
For technical support, including SM25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM25 requirements.
6.How does Aetrix verify that SM25 is sourced from the original manufacturer or authorized distributors?
All SM25 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 SM25 meets industry standards.
7.What is the process for return or replacement of SM25?
All SM25 units undergo pre-shipment inspection (PSI). If there is an issue with SM25, 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 SM25 part is unused and in its original packaging.
Return procedure for SM25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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