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Semtech Corporation 1N6473US
- Part No.:
- 1N6473US
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SQ-MELF, G
- Datasheet:
-
1N6473US.pdf
- Description:
- TVS DIODE 24VWM 41.4VC G-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,597
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Product details
Overview
1N6473US from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and 20mΩ dynamic resistance - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the 1N6473US datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for minimal voltage overshoot, DFN-6 footprint compatibility, and compliance with IEC 61000-4-2/4-4/4-5 standards in space-constrained designs.
Technical Context
The 1N6473US implements a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C with stable junction capacitance (175pF @ 22V, 1MHz) and reverse leakage (<600nA @ 22V), and dissipates energy via the FET channel rather than the PN junction - enabling higher surge robustness and thermal resilience than standard TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without triggering. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 (±1kV, RS = 42Ω) for industrial equipment and USB PD bus protection. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD stages in USB Type-C connector interfaces. |
| Dynamic Resistance | 20mΩ - minimizes voltage rise (ΔV = I × R) during fast transients, critical for protecting low-tolerance power rails. |
| Junction Capacitance | 175pF @ 22V, 1MHz - compatible with DC power and low-speed signal lines (e.g., CC, SBU, VBus), not suited for >100MHz data paths. |
Pinout & Package
1N6473US is housed in a RoHS-compliant DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad-less construction; all six terminals are functional and must be connected for full 40A rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be tied to solid ground plane with multiple vias to minimize inductance. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBus, load switch VIN); parallel connection ensures current sharing and full 40A capability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A - avoids overvoltage failure of 24V-rated controllers under worst-case surge conditions. |
| FET-based shunt topology | Dissipates surge energy in low-RDS(on) channel instead of PN junction - enables higher IPP and stable performance up to +125°C. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - reduces transient-induced voltage overshoot by >50% vs. typical 0.5Ω TVS diodes. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in industrial motor drives and PLC I/O modules. |
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 negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, clamping surges before they reach the PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping across –40°C to +125°C and 24–40A, ensuring PD controller survival where conventional TVS would exceed 35V at high temperature. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Primary front-end EOS protector, limiting voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents catastrophic failure of load switches rated for ≤30V absolute max by holding clamping <28V even during 40A 8/20μs surges. |
| IoT Device Power Rail Protection | Storage Device DC Bus Protection |
Use Scenario: Securing 22V-capable power inputs in battery-backed IoT gateways and edge sensors deployed in unshielded environments. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge immunity on main DC input rail. Use Value: Eliminates need for multi-stage protection (TVS + MOV + filter), reducing BOM count and PCB area while meeting IEC 61000-4-2/4-4/4-5 in one 1.6×1.6mm footprint. |
Use Scenario: Protecting 22V auxiliary rails in NVMe SSD enclosures and enterprise storage backplanes subject to hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: High-reliability clamping device placed at board edge near power connector to intercept incoming transients. Use Value: Enables use of cost-effective 24V-rated power management ICs by guaranteeing sub-28V clamping - avoiding derating or over-spec'ing downstream components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, same DFN-6 package, identical marking (T22), and shared Semtech documentation - confirmed pin-to-pin and functionally equivalent replacement. | No change required; validated for same USB PD, load switch, and industrial use cases. | Select TDS2211P when sourcing from authorized Semtech channels with full traceability and extended lifecycle support. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A (8/20μs), 1000W PPPK; no constant-clamp behavior - VC rises with current and temperature. | Requires higher derating margin for 24V systems; unsuitable for high-temp industrial operation where clamping must stay <30V. | Choose SMAJ22A only for cost-sensitive, non-critical 22V lines where 35.5V clamping is acceptable and ambient temperature stays <60°C. |
Compared with TDS2211P (identical spec and form factor) and SMAJ22A (higher clamping, temp-sensitive), the 1N6473US delivers guaranteed 27.5–28V clamping across full current and temperature range - making it the only option for robust 24V-system protection in automotive-adjacent or industrial environments.
Availability
1N6473US is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device power rails requiring stable component supply, long-term manufacturability, and compliance with IEC 61000-4-2/4-4/4-5.
Supply support for 1N6473US 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 1N6473US belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power and interface protection applications demanding stable clamping under surge and temperature stress.
FAQ
What is the maximum continuous operating voltage for the 1N6473US?
The 1N6473US has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC or RMS without conducting. This makes it suitable for 20V USB PD VBus and other 22V-rated power rails. Exceeding this voltage risks premature conduction and reduced reliability. The 1N6473US is not rated for sustained operation above 22V.
Does the 1N6473US require a thermal pad or heatsink?
No, the 1N6473US does not require a thermal pad or external heatsink. Its FET-based architecture dissipates surge energy in the channel rather than the junction, and the DFN-6 package is designed for direct PCB copper pour grounding. Layout guidelines emphasize low-inductance GND connections via multiple vias - not thermal mass - to maximize surge handling.
How does the 1N6473US differ from standard TVS diodes like SMAJ22A?
The 1N6473US uses a triggered FET shunt instead of a PN junction, delivering near-constant 27.5–28V clamping from 24A to 40A and across –40°C to +125°C. In contrast, SMAJ22A exhibits rising clamping (e.g., ~35.5V at 12.3A) and significant temperature drift. This makes the 1N6473US uniquely capable of protecting 24V-rated ICs under worst-case surge and thermal conditions.
Can the 1N6473US protect high-speed data lines such as USB SuperSpeed or PCIe?
No, the 1N6473US is not suitable for high-speed data lines. With 175pF junction capacitance at 22V, it would severely degrade signal integrity on >100MHz differential pairs. It is intended exclusively for DC power rails (VBus, load switch inputs) and low-speed control lines (CC, SBU). For SuperSpeed lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF).
Is the 1N6473US pin-compatible with TDS2211P?
Yes, the 1N6473US is pin-compatible and functionally identical to TDS2211P: both use the same DFN-6 package (1.6mm × 1.6mm), share identical pin configuration (Pins 1–3 = GND, Pins 4–6 = IN), matching electrical specs, and are marked "T22". They are interchangeable in layout and schematic with no design changes required.
1N6473US Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SQ-MELF, G
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 27V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 36.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- G-MELF (D-5C)
1N6473US FAQ
1.How can I place an order for 1N6473US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6473US 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 1N6473US reliable?
The price and inventory of 1N6473US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6473US is usually 5 days.
3.What payment methods are accepted for 1N6473US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6473US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6473US?
1N6473US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6473US 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 1N6473US?
For technical support, including 1N6473US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6473US requirements.
6.How does Aetrix verify that 1N6473US is sourced from the original manufacturer or authorized distributors?
All 1N6473US 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 1N6473US meets industry standards.
7.What is the process for return or replacement of 1N6473US?
All 1N6473US units undergo pre-shipment inspection (PSI). If there is an issue with 1N6473US, 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 1N6473US part is unused and in its original packaging.
Return procedure for 1N6473US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6473US Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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