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Semtech Corporation SM50
- Part No.:
- SM50
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
SM50.pdf
- Description:
- DIODE GEN PURP 5KV 300MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,994
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Product details
Overview
TDS2211P from Semtech is a transient diverting suppressor designed to protect 22V-rated I/O or power lines against EOS, ESD, and surge events using a shunt FET architecture. It delivers ±30kV IEC 61000-4-2 ESD protection, clamps at 27.5–28V up to 40A (8/20μs), maintains <20mΩ dynamic resistance, and operates from –40°C to +125°C - enabling robust USB Type-C PD bus protection.
For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include its constant clamping voltage across current/temperature, low 175pF junction capacitance at 22V, DFN 1.6×1.6mm 6-lead package, and suitability for industrial load switch input protection where conventional TVS diodes exhibit rising clamping voltage with temperature and peak current.
Technical Context
The TDS2211P uses a precision-triggered surge-rated FET as its primary protection element, activated only during overvoltage transients - unlike passive TVS diodes that conduct continuously above breakdown. Its trigger circuit initiates conduction when voltage exceeds ~25–27.9V, turning on the FET to shunt current to ground with near-zero RDS(on).
This architecture yields stable clamping (27.5–28V) across 24–40A peak pulse current and –40°C to +125°C, while delivering 1120W peak pulse power and ±4kV EFT immunity per IEC 61000-4-4. The device's 175pF capacitance at 22V and 130–600nA leakage support high-speed interfaces without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD bus nominal voltage and ensures no DC leakage or conduction during normal operation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays within safe margin below typical 30V+ damage thresholds of USB PD controllers and load switches. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment and USB PD systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds Class 4 ESD immunity, eliminating need for secondary ESD stages in compact designs. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough to avoid signal distortion on 100Mbps+ power bus lines, unlike higher-capacitance TVS alternatives. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables flat clamping response and minimizes voltage overshoot during fast-rising surges. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish. Pin 1 marked by laser dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current handling and minimize parasitic inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBus); parallel connection of all three pins reduces trace inductance and distributes surge current evenly across internal FET channels. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Clamping Architecture | Clamping voltage remains stable (27.5–28V) from 24A to 40A and –40°C to +125°C - eliminates derating uncertainty in thermal or high-current environments. |
| Shunt FET Protection Element | Surge-rated MOSFET replaces PN-junction TVS, achieving <20mΩ dynamic resistance and avoiding thermal runaway under repeated surges. |
| Low Leakage & Capacitance | 130–600nA reverse leakage at 22V and 175pF capacitance enable use on always-on power rails without loading or bandwidth loss. |
| Industrial Temperature Range | Rated for –40°C to +125°C operation - supports deployment in automotive infotainment power supplies and industrial IoT gateways. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBus line in USB Type-C ports supporting up to 20V/5A PD negotiation against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the Type-C receptacle, acting as first-line clamping device before the PD controller and load switch. Use Value: Maintains 27.5–28V clamping across full temperature range and 40A surge, preventing latch-up or gate oxide damage in downstream 30V-rated PD controllers like STUSB4500 or TI TPS6598x. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., ON Semi NIS5132, Diodes AP22653) in remote meters and robotics against 1kV/42Ω surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VIN rail, limiting stress on the load switch's internal FET during EOS events. Use Value: Prevents destruction of the load switch's integrated MOSFET by holding clamping voltage below its absolute maximum VDS rating (typically 30–40V), even at 125°C ambient. |
| IoT Edge Device Power Rail Protection | Storage Device 22V Backup Power Line |
Use Scenario: Securing 22V auxiliary power inputs in battery-backed smart sensors and gateway modules exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone EOS protector on unregulated 22V input, operating independently of system MCU or PMIC control. Use Value: Delivers ±30kV ESD immunity and 40A surge capability in a 1.6×1.6mm footprint - enabling compact, sealed enclosures without external spark gaps or MOVs. |
Use Scenario: Protecting the 22V backup supply rail in NVMe SSDs or enterprise HDDs during hot-swap events and power-rail coupling transients. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor on the 22V standby rail, co-located with the backup capacitor bank. Use Value: 175pF capacitance avoids resonance with typical 10–100μF backup capacitors, while 27.5V clamping prevents overvoltage damage to backup LDOs and SRAM retention circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Semtech TDS2411P | 24V working voltage, 28.5–29V clamping at 40A, 200pF capacitance - higher VRWM but slightly higher CJ and clamping. | Targeted for 24V industrial buses (e.g., CAN FD power rails, PoE++ inputs); less optimal for strict 22V USB PD compliance. | Select TDS2411P only if system nominal voltage exceeds 22V and margin to 24V is confirmed; otherwise TDS2211P provides tighter clamping alignment. |
| Littelfuse SP3022-01FTG | 22V working voltage, 33V clamping at 30A (8/20μs), 0.35pF capacitance - lower CJ but significantly higher clamping voltage and lower IPP. | Better suited for ultra-low-capacitance data-line protection (e.g., USB SS lanes), not power-line clamping where low VC is critical. | Use SP3022-01FTG for signal-line ESD only; TDS2211P remains superior for VBus/power-rail protection due to 27.5V clamping and 40A rating. |
Compared with TDS2411P and SP3022-01FTG, the TDS2211P uniquely balances 22V working voltage alignment, sub-28V clamping, 40A surge rating, and 175pF capacitance - making it the only option qualified for high-reliability USB PD VBus protection where both voltage margin and energy handling are simultaneously constrained.
Availability
TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch protection, and IoT edge device power rail hardening requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
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 analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The TDS family was engineered specifically for high-energy EOS protection in next-generation power interfaces - prioritizing flat clamping, temperature stability, and compact form factor over legacy TVS limitations.
FAQ
What is the primary protection function of the TDS2211P?
The TDS2211P functions as a transient diverting suppressor that protects 22V-rated power or I/O lines by activating a precision-triggered shunt FET during EOS events. Unlike standard TVS diodes, it maintains a nearly constant 27.5–28V clamping voltage across its full 40A surge rating and –40°C to +125°C operating range - ensuring predictable protection behavior in USB PD, industrial, and IoT applications where thermal and current derating are critical concerns. This behavior is intrinsic to the TDS2211P design and verified in its Rev 2.5 datasheet.
Does the TDS2211P require external bias or control signals to operate?
No, the TDS2211P is a fully autonomous, passive protection device with no external control pins, enable inputs, or bias requirements. Its internal trigger circuit activates the shunt FET automatically when transient voltage exceeds the breakdown threshold (~25–27.9V), and it returns to high-impedance standby mode once the event subsides. This self-contained operation makes the TDS2211P ideal for space-constrained, low-power, or safety-critical designs where added complexity or failure modes from external circuitry must be avoided - a core feature confirmed in the TDS2211P functional diagram and application notes.
Can the TDS2211P replace a standard TVS diode in an existing 22V protection circuit?
The TDS2211P can serve as a functional upgrade to standard TVS diodes in 22V applications, but direct replacement requires PCB layout verification: all six pins must be re-routed (three GND and three IN) to match the DFN 1.6×1.6mm 6-lead footprint, and ground vias must be increased to handle 40A surge current. While the TDS2211P offers superior clamping stability and temperature performance versus conventional TVS devices, its pin count and routing demands differ - meaning board revision is typically needed. This distinction is explicitly documented in the TDS2211P pin configuration and PCB layout guidelines.
What is the significance of the TDS2211P's 20mΩ dynamic resistance?
The TDS2211P's 20mΩ dynamic resistance (measured between 1A and 40A, 8/20μs) reflects the extremely low on-resistance of its internal shunt FET during conduction - directly enabling its flat clamping voltage profile. This value ensures minimal voltage overshoot during fast-rising transients and allows the device to dissipate surge energy more efficiently than TVS diodes with fixed RDYN >1Ω. As confirmed in the TDS2211P electrical characteristics table, this low RDYN is a design-guaranteed parameter contributing to its 27.5–28V clamping consistency - a key differentiator validated across temperature and current in the datasheet's typical characteristics plots.
Is the TDS2211P suitable for protecting high-speed data lines such as USB SuperSpeed?
No, the TDS2211P is not intended for high-speed data line protection due to its 175pF junction capacitance at 22V - which would severely degrade signal integrity on USB 3.x, PCIe, or DisplayPort lanes. It is expressly designed for power rail and low-speed I/O protection (e.g., VBus, CC, SBU, load switch inputs). For SuperSpeed differential pairs, Semtech recommends dedicated low-capacitance TVS devices like RClamp3371ZC (<0.25pF), as specified in the TDS2211P application information section for USB Type-C solutions. Using the TDS2211P on data lines violates its defined use case and electrical specification boundaries.
SM50 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):
- 5000 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 @ 5000 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
SM50 FAQ
1.How can I place an order for SM50 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50 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 SM50 reliable?
The price and inventory of SM50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50 is usually 5 days.
3.What payment methods are accepted for SM50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50?
SM50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50 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 SM50?
For technical support, including SM50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50 requirements.
6.How does Aetrix verify that SM50 is sourced from the original manufacturer or authorized distributors?
All SM50 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 SM50 meets industry standards.
7.What is the process for return or replacement of SM50?
All SM50 units undergo pre-shipment inspection (PSI). If there is an issue with SM50, 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 SM50 part is unused and in its original packaging.
Return procedure for SM50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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