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Semtech Corporation 1N3647
- Part No.:
- 1N3647
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
1N3647.pdf
- Description:
- DIODE GEN PURP 3KV 600MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection on 22V voltage buses or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping across temperature and current range; it protects USB Type-C power delivery lines, load switch inputs, and industrial equipment interfaces.
For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, this device offers superior clamping stability versus conventional TVS diodes-critical for designs requiring consistent overvoltage protection under varying surge conditions and operating temperatures up to +125°C.
Technical Context
The TDS2211P uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt FET when transient voltage exceeds breakdown threshold; clamping voltage remains nearly constant due to ultra-low dynamic resistance (20mΩ) and decreasing RDS(on) with increasing current.
Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN), the TDS2211P maintains ~27.5–28V clamping from 24A to 40A and across –40°C to +125°C, enabling robust protection in USB PD, industrial power rails, and load switch input stages without thermal derating penalties.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage the device safely blocks without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage thresholds during high-energy surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial and USB PD applications. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD protection on high-voltage data/power lines. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 22V bus protection without signal integrity degradation in moderate-speed interfaces. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Operating Temperature | –40°C to +125°C - supports deployment in automotive-adjacent, industrial, and ruggedized IoT environments. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS-compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground connection points - all three must be soldered to maximize surge current path and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input - connected directly to VBus or power/data line; parallel routing required for full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables near-constant clamping voltage independent of surge amplitude or ambient temperature - unlike TVS diodes. |
| Low dynamic resistance (20mΩ) | Reduces voltage overshoot during sub-microsecond transients and improves energy handling without thermal runaway. |
| High EFT immunity (±4kV, IEC 61000-4-4) | Protects against repetitive burst noise in industrial control and motor drive environments without parameter drift. |
| DFN 1.6×1.6mm footprint | Saves >60% board area vs. SO-8 or SOT-23 TVS solutions while maintaining 1120W peak power capability. |
| Stable leakage (<600nA @ 22V) | Prevents standby power loss in battery-powered IoT and portable devices with always-on protection. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBus lines in USB Type-C ports supporting up to 20V/5A PD profiles against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - avoids overvoltage damage to sensitive PD controllers where conventional TVS would clamp >38V. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) exposed to 42Ω/0.5μF surge coupling in metering or robotics systems. IC Role / Device Role / Timing Role: Front-end transient diverter that routes surge current away from internal FET gate oxide and drain-source junction. Use Value: Limits voltage stress on load switch input to ≤28V during ±1kV IEC 61000-4-5 events - preventing latch-up or permanent gate oxide failure. |
| Notebook/Tablet VBus Line Protection | IoT Device Power Rail Protection |
Use Scenario: Securing 20–22V power rails feeding PMICs or battery charging circuits in thin-client computing platforms. IC Role / Device Role / Timing Role: Standalone high-energy suppressor replacing multi-stage TVS+capacitor networks on main power input. Use Value: Single-component solution with 175pF capacitance avoids resonance issues in compact layouts while delivering 40A surge capacity. |
Use Scenario: Hardening 22V auxiliary rails in smart sensors or edge gateways deployed in uncontrolled environments (e.g., factory floors, outdoor kiosks). IC Role / Device Role / Timing Role: Primary EOS barrier for externally accessible power inputs subject to ESD, EFT, and indirect lightning coupling. Use Value: Guaranteed ±30kV ESD and ±4kV EFT performance ensures compliance with IEC 61000-4-x without layout-dependent tuning. |
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, higher clamping rise with current/temp. | Limited to lower-energy surges; unsuitable for sustained 40A or high-temp operation without derating. | Use only where cost sensitivity outweighs clamping stability and surge margin requirements. |
| TPD2E007DRYR | Low-capacitance (3.5pF) dual-channel ESD protector; 22V VRWM, but rated only for 4A IPP and ±8kV ESD. | Designed for high-speed data lines (e.g., USB 2.0), not power rail surge suppression. | Select only for signal-line ESD-only use; cannot replace TDS2211P in power/bus protection roles. |
Compared with SMAJ22A and TPD2E007DRYR, the TDS2211P delivers uniquely stable clamping across current and temperature, enabling reliable 40A surge handling in space-constrained 22V power applications where TVS voltage drift would compromise system robustness.
Availability
TDS2211P is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch protection, and IoT device power rail hardening requiring stable component supply and long-term lifecycle support.
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 ICs for precision sensing, protection, and signal integrity.
The TDS product line was developed to overcome clamping instability limitations of traditional TVS diodes, targeting high-reliability 22V–48V power and interface protection in industrial, computing, and USB ecosystem applications.
FAQ
What is the maximum continuous operating voltage for the TDS2211P?
The TDS2211P has a reverse stand-off voltage (VRWM) of 22V, meaning it reliably blocks voltages up to 22V DC in normal operation without significant leakage. This makes it suitable for protecting 20V USB PD VBus lines and other 22V-rated power rails. Exceeding 22V may cause premature conduction or accelerated aging. The TDS2211P is specifically rated for this voltage level per its datasheet absolute maximum and electrical characteristics tables.
How does the TDS2211P achieve stable clamping voltage across temperature?
The TDS2211P achieves stable clamping by using a surge-rated FET as the main protection element, triggered by a precision circuit - not a PN-junction diode. As surge current increases, the FET's RDS(on) decreases, counteracting voltage rise. Clamping remains ~27.5–28V from –40°C to +125°C, unlike TVS diodes whose VC rises with temperature. This behavior is confirmed in the TDS2211P datasheet's clamping vs. temperature plots and electrical characteristics table.
Can the TDS2211P replace a standard TVS diode in an existing 22V design?
The TDS2211P can replace many 22V TVS diodes, but requires verification of pin compatibility, PCB layout, and surge profile. Its DFN 6-pin package differs from common DO-214 or SOD-123 footprints, and all six pins must be connected (three GND, three IN) to achieve full 40A rating. Layout changes are needed to ensure low-inductance grounding and direct trace routing. The TDS2211P datasheet explicitly states this requirement in the Pin Configuration and PCB Layout Recommendation sections.
What is the junction capacitance of the TDS2211P, and how does it affect circuit performance?
The TDS2211P has a junction capacitance of 175pF at 22V and 1MHz, measured per its datasheet electrical characteristics table. This value is appropriate for 22V power rail and moderate-speed interface protection but too high for high-speed data lines like USB 3.x or PCIe. It introduces minimal impedance impact on DC/low-frequency power paths while providing effective transient energy absorption - a deliberate trade-off optimized for bus-level EOS suppression rather than signal integrity preservation.
Does the TDS2211P require external components for basic operation?
No, the TDS2211P operates as a standalone transient suppressor with no external bias, resistors, or capacitors required. Its integrated trigger circuit and shunt FET enable autonomous activation above breakdown threshold. However, optimal performance demands proper PCB layout: short, wide traces to the connector; all six pins soldered; multiple vias from GND pins to internal ground plane; and placement adjacent to the protected interface. These guidelines are detailed in the TDS2211P datasheet Application Information section.
1N3647 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):
- 3000 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 @ 3000 V
- Capacitance @ Vr, F:
- 8pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -65°C ~ 175°C
1N3647 FAQ
1.How can I place an order for 1N3647 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3647 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 1N3647 reliable?
The price and inventory of 1N3647 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3647 is usually 5 days.
3.What payment methods are accepted for 1N3647?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3647 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3647?
1N3647 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3647 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 1N3647?
For technical support, including 1N3647 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3647 requirements.
6.How does Aetrix verify that 1N3647 is sourced from the original manufacturer or authorized distributors?
All 1N3647 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 1N3647 meets industry standards.
7.What is the process for return or replacement of 1N3647?
All 1N3647 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3647, 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 1N3647 part is unused and in its original packaging.
Return procedure for 1N3647:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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