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Semtech Corporation S25F
- Part No.:
- S25F
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
S25F.pdf
- Description:
- DIODE GEN PURP 2.5KV 500MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,322
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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 (8/20μs) peak pulse current handling, and stable 27.5–28V clamping voltage across temperature and current range-used in USB Type-C PD bus protection and load switch input safeguarding.
For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under 40A surge, DFN-6 thermal and layout performance, low 175pF junction capacitance at 22V, and compatibility with industrial-grade temperature operation (−40°C to +125°C).
Technical Context
The TDS2211P uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown threshold-enabling near-constant clamping voltage independent of peak pulse current magnitude. Its dynamic resistance is only 20mΩ (measured 1A–40A, 8/20μs), far lower than conventional TVS diodes.
Unlike standard TVS devices whose clamping voltage rises linearly with IPP due to fixed RDYN, the TDS2211P maintains ~27.6V clamping from 24A to 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω) and exhibits minimal drift from −40°C to +125°C-critical for USB PD and industrial load switch applications where thermal derating compromises traditional solutions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, RS = 2Ω) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| Peak Pulse Current | 40A (tp = 8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness standards without degradation. |
| Junction Capacitance | 175pF at VR = 22V, f = 1MHz - low enough for USB Type-C VBUS protection without signal integrity impact on adjacent high-speed lanes. |
| Dynamic Resistance | 20mΩ (1A–40A, 8/20μs) - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Operating Temperature | −40°C to +125°C - supports deployment in harsh environments including industrial equipment and automotive-infotainment power rails. |
Pinout & Package
Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound, tape-and-reel packaging (3,000 pcs/reel).
| 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 (e.g., USB PD VBUS); parallel connection of all three pins required to achieve full 40A rating and optimal thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage remains stable (27.5–28V) across 24A–40A and −40°C–+125°C-eliminates thermal derating uncertainty in industrial designs. |
| FET-based shunt topology | Replaces PN-junction TVS with low-RDS(on) surge FET, reducing dynamic resistance to 20mΩ and enabling superior energy diversion vs. silicon avalanche diodes. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) supports compliance with IEC 61000-4-5 ±1kV (RS = 42Ω, CS = 0.5μF) for unsymmetrical line testing. |
| Low leakage & capacitance | 600nA max reverse leakage at 22V and 175pF junction capacitance ensure minimal standby power loss and no high-speed signal distortion on protected buses. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V USB PD VBUS lines against lightning-induced surges, ESD, and EOS events in portable and docking station designs. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at connector entry point to clamp overvoltage before reaching PD controller or e-fuse. Use Value: Maintains 27.6V clamping at 40A and 125°C-prevents false triggering or damage to 24V-tolerant PD controllers where conventional TVS would exceed safe limits. |
Use Scenario: Safeguarding input terminals of industrial load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways exposed to field-installed wiring transients. IC Role / Device Role / Timing Role: Primary front-end surge protector that diverts energy away from the load switch's internal MOSFET drain-source junction. Use Value: Limits clamping voltage to ≤28V-well below typical 30V+ absolute maximum ratings of integrated load switches, extending reliability and lifetime. |
| IoT Device Power Rail Protection | Storage Device DC Power Input Protection |
|
Use Scenario: Securing 22V-rated auxiliary power inputs in battery-backed edge sensors and wireless gateways subject to EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Solid-state EOS suppressor replacing bulkier MOV/TVS stacks while delivering higher surge endurance and tighter voltage control. Use Value: ±4kV EFT immunity (IEC 61000-4-4) and 175pF capacitance enable compact PCB layout without compromising EMC robustness or standby current. |
Use Scenario: Protecting SATA or NVMe storage module 22V auxiliary rails against hot-plug transients and backplane coupling in enterprise servers and NAS enclosures. IC Role / Device Role / Timing Role: Low-capacitance, high-current transient suppressor placed at board-level power entry to prevent latch-up or gate oxide damage in PMICs. Use Value: Stable 27.5V clamping at 24A ensures critical storage controller ICs remain within safe operating area during repeated surge exposure. |
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; clamping voltage rises to ~42V at 40A (8/20μs), RDYN ≈ 0.5Ω; no temperature compensation. | Limited to lower-energy surges; requires larger derating margin in high-temp environments; unsuitable for tight-clamp USB PD designs. | Select SMAJ22A only if cost sensitivity outweighs clamping precision and thermal stability requirements. |
| TPD2E001DRYR | Low-capacitance (0.9pF) dual-channel ESD protector; rated for 4A (8/20μs), 12V working voltage-no EOS/surge capability. | Designed exclusively for high-speed data line ESD (e.g., USB SS, DP/DM); cannot handle VBUS-level surge currents or voltages. | Use TPD2E001DRYR for superspeed lane protection alongside TDS2211P-not as a replacement for power rail suppression. |
Compared with SMAJ22A and TPD2E001DRYR, the TDS2211P uniquely delivers constant 27.6V clamping at 40A across −40°C to +125°C, making it the only viable option for 22V industrial and USB PD power rail protection where thermal stability and high-energy surge handling are non-negotiable.
Availability
TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch interfaces, and IoT device power rail protection requiring stable component supply, long-term lifecycle support, and traceable 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 semiconductor company specializing in high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity applications.
The TDS series was developed to overcome clamping voltage drift and thermal derating limitations of conventional TVS diodes-targeting high-reliability 22V–36V industrial, computing, and USB infrastructure applications.
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 from electrical overstress events-including ESD (±30kV), EFT (±4kV), and surge (40A, 8/20μs). It uses a precision-triggered FET shunt to maintain stable clamping voltage, unlike conventional TVS diodes whose voltage rises with current and temperature. This makes the TDS2211P especially effective in USB PD and industrial load switch applications where consistent voltage limiting is critical.
How does the TDS2211P differ from standard TVS diodes in clamping behavior?
The TDS2211P achieves nearly constant clamping voltage (27.5–28V) across its full 24A–40A surge range and −40°C to +125°C operating temperature, thanks to its low-RDS(on) FET-based architecture and dynamic resistance of just 20mΩ. In contrast, standard TVS diodes exhibit linear clamping rise (e.g., VC = VBR + IPP × RDYN), often exceeding 40V at 40A and degrading further at elevated temperatures. This fundamental difference makes the TDS2211P more reliable for protecting sensitive 24V-tolerant ICs like USB PD controllers.
What is the correct PCB layout practice for the TDS2211P to achieve rated 40A performance?
To achieve the full 40A (8/20μs) rating, all three IN pins (4, 5, 6) must be shorted together via a single low-inductance trace to the protected line, and all three GND pins (1, 2, 3) must connect to a solid ground plane using multiple vias. The device must be placed as close as possible to the connector entry point to minimize trace inductance. Failure to interconnect all pins reduces surge current handling and increases clamping voltage-verified in Semtech's layout guidelines and functional testing.
Can the TDS2211P be used for protecting USB Type-C superspeed differential pairs?
No-the TDS2211P is not suitable for USB Type-C superspeed (TX/RX) or sideband use (SBU) lines. Its 175pF junction capacitance would severely degrade signal integrity on high-speed differential channels. Semtech explicitly recommends low-capacitance devices like RClamp3371ZC (<0.25pF) for superspeed lanes and uClamp2411ZA for CC/SBU lines. The TDS2211P is intended solely for VBUS or other 22V power/data lines where capacitance is not a constraint.
What are the absolute maximum ratings that define safe operation of the TDS2211P?
The TDS2211P has an absolute maximum peak pulse power of 1120W (8/20μs), peak pulse current of 40A (8/20μs), reverse stand-off voltage of 22V, and operating temperature range of −40°C to +125°C. Exceeding any of these-especially sustained voltage above 22V or junction temperature beyond +150°C-may cause irreversible degradation. These limits are validated per IEC 61000-4-2, -4-4, and -4-5, and must be respected in both schematic design and thermal layout.
S25F 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):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 5 V @ 100 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 300 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 2500 V
- Capacitance @ Vr, F:
- 4pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -65°C ~ 175°C
S25F FAQ
1.How can I place an order for S25F through Aetrix?
Please submit a Request for Quotation (RFQ) for S25F 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 S25F reliable?
The price and inventory of S25F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S25F is usually 5 days.
3.What payment methods are accepted for S25F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S25F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S25F?
S25F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S25F 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 S25F?
For technical support, including S25F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S25F requirements.
6.How does Aetrix verify that S25F is sourced from the original manufacturer or authorized distributors?
All S25F 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 S25F meets industry standards.
7.What is the process for return or replacement of S25F?
All S25F units undergo pre-shipment inspection (PSI). If there is an issue with S25F, 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 S25F part is unused and in its original packaging.
Return procedure for S25F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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