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Semtech Corporation 3SM4
- Part No.:
- 3SM4
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
3SM4.pdf
- Description:
- DIODE GEN PURP 400V 5A AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,058
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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 precision-triggered shunt FET architecture; it delivers ±30kV IEC 61000-4-2 ESD protection, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping across temperature and current range; used in USB Type-C PD bus protection.
For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over 40A and −40°C to +125°C, low dynamic resistance (20 mΩ), junction capacitance (175 pF at 22V), and DFN 1.6×1.6mm 6-lead layout compatibility with high-density USB and industrial interfaces.
Technical Context
The TDS2211P employs a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage beyond ~25V breakdown; unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge, not fixed RDYN-based rise.
It operates as a bidirectional shunt device between IN (pins 4–6) and GND (pins 1–3), with reverse stand-off voltage of 22V, breakdown at 25–27.9V, and guaranteed clamping ≤28V at both 24A and 40A per IEC 61000-4-5 combination waveforms (1.2/50μs voltage + 8/20μs current, RS = 2Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28 V at 40A - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during full-surge events. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds Level 4 human-body-model robustness for connector-facing protection. |
| Dynamic Resistance | 20 mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175 pF at 22V, 1 MHz - compatible with DC/low-speed power and control lines; not suitable for >100 Mbps data lanes. |
| Operating Temp. | −40°C to +125°C - supports industrial and automotive under-hood ambient conditions without derating. |
Pinout & Package
Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, Pb-free, RoHS-compliant, UL 94V-0 molding compound; thermal pad not required-energy dissipated in silicon FET.
| 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 sharing and minimize parasitic inductance. |
| Pins 4, 5, 6 | IN | Protected line input (bidirectional); all three pins connect in parallel to same trace for lowest impedance path to protected bus. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <0.5 V across 24–40A surge range and −40°C to +125°C-enables predictable system-level protection margin. |
| Low dynamic resistance | 20 mΩ ensures minimal IR drop during surge, reducing voltage overshoot and enabling smaller PCB trace widths. |
| High-energy surge rating | 1120 W peak pulse power (8/20μs) supports repeated lightning-induced surges in industrial equipment without degradation. |
| Integrated trigger + drive circuit | Eliminates external biasing or timing components; activates shunt FET within nanoseconds of overvoltage detection. |
| DFN space efficiency | 1.6×1.6 mm footprint saves >60% board area vs. SO-8 or SOT-23 TVS solutions rated for comparable 40A surge. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C receptacles supporting up to 20V/5A PD negotiation, exposed to ESD and hot-plug surges. IC Role / Device Role / Timing Role: Primary shunt protector placed directly at connector, clamping transients before reaching PD controller or load switch. Use Value: Maintains clamping ≤28V across temperature-prevents latch-up or gate oxide damage in 24V-tolerant PD controllers like STUSB4500 or TUSB7320. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., ON Semi NIS5132, TI TPS25940) in remote meters or robotics. IC Role / Device Role / Timing Role: Front-end EOS suppressor limiting voltage stress on internal FET's drain-source junction during lightning-induced surges. Use Value: Keeps clamping voltage below 30V-ensures safe operation within 30V absolute max rating of common 24V-input load switches. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Supply Protection |
Use Scenario: Securing 22V auxiliary rails powering cellular modems or sensor hubs in battery-backed IoT gateways deployed outdoors. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT (±4kV), and surge (±1kV) immunity per IEC 61000-4-x standards. Use Value: Eliminates need for multi-stage TVS + MOV + filter networks-reduces BOM count and improves reliability in compact enclosures. |
Use Scenario: Protecting 22V supercapacitor or LiFePO₄ backup supplies in NVMe SSDs or enterprise storage controllers during hot-swap events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp preventing overvoltage damage to charge management ICs and PMICs during capacitor inrush or fault recovery. Use Value: 175 pF capacitance avoids signal integrity issues on low-frequency supply monitoring lines while delivering 40A surge headroom. |
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, 27V min breakdown, identical 6-pin DFN package and 40A surge rating. | Better suited for 24V systems (e.g., PoE++ inputs); clamps at ~30V-less optimal for strict 22V bus margins. | Select when protecting 24V rails where higher VRWM provides wider design margin against ripple-induced false triggering. |
| Littelfuse SP3022-01UTG | 22V VRWM, but uses standard TVS diode architecture; clamping rises to ~38V at 40A and increases with temperature. | Lower cost, but requires derating at high ambient temps; unsuitable for thermally constrained industrial enclosures. | Choose only for cost-sensitive, non-temperature-critical 22V applications where clamping voltage margin >10V is acceptable. |
Compared with TDS2211P, TDS2411P offers higher working voltage but slightly elevated clamping, while SP3022-01UTG lacks constant-clamp behavior-making TDS2211P the only option guaranteeing ≤28V clamping across full surge and temperature range.
Availability
TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch protection, and IoT edge node power rail applications requiring stable component supply, long-term lifecycle support, and consistent surge performance.
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 series was developed to replace conventional TVS diodes in high-reliability 20–30V industrial and interface applications where stable clamping and temperature insensitivity are critical.
FAQ
What is the primary protection mechanism used in the TDS2211P?
The TDS2211P uses a precision-triggered shunt FET architecture-not a traditional TVS diode. When an overvoltage event exceeds ~25V, a dedicated trigger circuit activates a low-RDS(on) FET to divert surge current to ground. This results in near-constant clamping voltage across current and temperature, unlike voltage-rise behavior in standard TVS devices. The TDS2211P achieves this without external components or biasing.
Can the TDS2211P be used on high-speed data lines such as USB SuperSpeed or PCIe?
No-the TDS2211P is not suitable for high-speed data lines. Its 175 pF junction capacitance at 22V would severely degrade signal integrity above ~10 MHz. It is intended exclusively for DC power rails, control lines, or low-speed buses (e.g., USB PD communication, CC/SBU, or industrial I²C). For SuperSpeed lanes, Semtech recommends RClamp3371ZC (<0.25 pF) alongside the TDS2211P in hybrid protection schemes.
How should the six pins of the TDS2211P be routed on the PCB?
All three GND pins (1–3) must be connected together and tied directly to a solid ground plane using multiple vias; all three IN pins (4–6) must be shorted together and connected via a single low-inductance trace to the protected line-ideally placed adjacent to the connector. Splitting or omitting any pin degrades surge current handling and clamping consistency. Layout guidelines explicitly prohibit stub traces or isolated pins.
Does the TDS2211P require a thermal pad or heatsink for 40A surge events?
No thermal pad or external heatsink is required. The TDS2211P dissipates surge energy within the silicon FET structure, not at a junction interface. Its DFN package relies on copper pour and vias to ground for transient heat sinking-not steady-state thermal management. The datasheet confirms no thermal pad is needed, and typical layouts use only standard solder mask-defined lands per the provided land pattern.
Is the TDS2211P compliant with automotive AEC-Q200 or industrial safety standards?
The TDS2211P is not AEC-Q200 qualified. It meets industrial-grade reliability per its −40°C to +125°C operating range and IEC 61000-4-2/4-4/4-5 compliance, but Semtech does not list AEC-Q200 qualification for this part. For automotive applications, designers must perform system-level validation-including board-level surge testing and lifetime reliability assessment-since no component-level automotive qualification is claimed in the official datasheet or ordering information.
3SM4 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):
- 400 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 3 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 400 V
- Capacitance @ Vr, F:
- 92pF @ 5V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -
3SM4 FAQ
1.How can I place an order for 3SM4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 3SM4 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 3SM4 reliable?
The price and inventory of 3SM4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3SM4 is usually 5 days.
3.What payment methods are accepted for 3SM4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3SM4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3SM4?
3SM4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3SM4 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 3SM4?
For technical support, including 3SM4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3SM4 requirements.
6.How does Aetrix verify that 3SM4 is sourced from the original manufacturer or authorized distributors?
All 3SM4 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 3SM4 meets industry standards.
7.What is the process for return or replacement of 3SM4?
All 3SM4 units undergo pre-shipment inspection (PSI). If there is an issue with 3SM4, 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 3SM4 part is unused and in its original packaging.
Return procedure for 3SM4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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