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Semtech Corporation 1N6471US
- Part No.:
- 1N6471US
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SQ-MELF, G
- Datasheet:
-
1N6471US.pdf
- Description:
- TVS DIODE 12VWM 22.6VC G-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:5,937
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Product details
Overview
1N6471US 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. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the 1N6471US datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, clamping stability across temperature and current, and real-world implementation details for EOS-critical bus protection.
Technical Context
The 1N6471US uses 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 across 24–40A and −40°C to +125°C - due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM) and 25–27.9V breakdown (VBR), exhibits only 130–600nA leakage at VRWM, and maintains 175pF junction capacitance at 22V/1MHz - enabling robust protection without signal integrity compromise in high-speed power bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Stand-Off Voltage | 22V - defines maximum continuous operating voltage before clamping activation |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo waveform) - ensures protected ICs remain below damage thresholds during worst-case surges |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD stress test levels |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise under increasing surge current |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid degrading 20V power rail stability or coupling into adjacent signals |
Pinout & Package
1N6471US is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no solder mask defined). All six terminals are electrically active: three parallel input pins and three parallel ground pins - mandatory for full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Parallel ground connection points - all must be routed to low-inductance ground plane via multiple vias to sustain 40A surge current |
| Pins 4, 5, 6 | IN | Parallel input terminals - connect directly to protected line (e.g., USB PD VBus); all three required for rated clamping performance |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and −40°C to +125°C - eliminates derating uncertainty in thermal or high-current designs |
| FET-based shunt topology | Replaces pn-junction TVS with <0.1Ω RDS(on) - dissipates surge energy in channel rather than junction, improving reliability and lifetime |
| Low dynamic resistance | 20mΩ measured between 1A–40A - ensures minimal IR drop and predictable voltage limiting during fast-rising transients |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz bursts) - protects against repetitive switching noise in motor drives and PLCs |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V USB PD VBus lines from lightning-induced surges and connector hot-plug ESD events. IC Role / Device Role / Timing Role: Transient diverting suppressor placed at connector entry point to clamp overvoltage before reaching PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across temperature and current - avoids overdesigning with higher-VBR TVS devices while guaranteeing controller survival at 125°C ambient. |
Use Scenario: Shielding HS2950P or similar load switches from EOS during field wiring faults or inductive kick in robotics and remote meters. IC Role / Device Role / Timing Role: Primary front-end protector that limits voltage seen by the load switch's internal FET drain-source junction. Use Value: Prevents gate oxide damage and latch-up in downstream e-fuse ICs by holding clamping voltage well below their absolute maximum ratings (e.g., <30V). |
| IoT Device DC Power Input Protection | Notebook/Tablet Main Power Rail Protection |
Use Scenario: Securing 22V-rated auxiliary power inputs in battery-powered IoT gateways exposed to uncontrolled wall adapters or PoE injectors. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV networks - reduces BOM count and PCB area. Use Value: 1.6mm × 1.6mm footprint saves >60% board space versus SOD-123 TVS alternatives while delivering superior 40A surge handling. |
Use Scenario: Safeguarding main system power rails (e.g., 20V adapter input) in thin-profile notebooks where thermal margin is constrained. IC Role / Device Role / Timing Role: Low-capacitance (175pF), low-leakage (≤600nA) protector that avoids loading regulation loop stability or causing standby current issues. Use Value: Enables direct integration without RC filtering or compensation - supports fast transient response and clean power sequencing. |
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; no constant-clamp behavior; clamping rises with current/temp | Limited to lower-energy surges; requires derating above 85°C; unsuitable for 40A or high-temp industrial use | Select only if cost sensitivity outweighs clamping stability and surge rating requirements |
| TDS2211P | Same die, identical specs, and pinout - direct manufacturer-recommended replacement with identical marking (T22 prefix) and packaging | No functional or layout change required; fully interchangeable in production and design | Preferred for new designs requiring guaranteed Semtech TDS performance and supply continuity |
Compared with SMAJ22A, 1N6471US delivers 8.5V lower clamping at full 40A and stable performance up to 125°C - critical for protecting modern PD controllers. Versus TDS2211P, it is functionally identical but may reflect alternate traceability or qualification batch; both share same datasheet and mechanical form.
Availability
1N6471US is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device DC power rails requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for 1N6471US 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 1N6471US belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered specifically to replace conventional TVS diodes in high-reliability 20–30V power bus protection where clamping stability, temperature insensitivity, and high surge current are mandatory.
FAQ
What is the exact package type and dimensions of the 1N6471US?
The 1N6471US uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. All six terminals must be soldered to achieve full 40A surge rating and specified clamping performance - partial connection degrades capability.
How does the 1N6471US differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN), the 1N6471US uses a triggered FET shunt that maintains 27.5–28V clamping from 24A to 40A and across −40°C to +125°C - eliminating thermal and current derating uncertainty in critical designs.
Can the 1N6471US be used to protect USB Type-C CC lines?
No - the 1N6471US is rated for 22V VRWM and intended for VBus or power-line protection. For CC/SBU lines, Semtech recommends uClamp2411ZA (24V, ultra-low capacitance). Using 1N6471US on CC lines risks damaging the 5V-tolerant PHY due to excessive clamping voltage and capacitance.
What is the maximum allowable PCB trace inductance when routing the 1N6471US?
To preserve 40A surge capability and sub-30V clamping, total GND path inductance must be minimized: use ≥3 vias per GND pin (pins 1–3) to inner ground plane, keep IN-to-GND loop area <1mm², and place 1N6471US within 3mm of the protected connector. Exceeding 0.5nH total loop inductance causes overshoot beyond 28V.
Is the 1N6471US compliant with RoHS, REACH, and halogen-free standards?
Yes - the 1N6471US is Pb-free, halogen-free, and fully compliant with RoHS Directive 2011/65/EU and WEEE Directive 2012/19/EU. Its molding compound meets UL 94V-0 flammability rating, and lead finish is matte tin over nickel underplate - confirmed in Semtech's official material declarations.
1N6471US 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):
- 12V
- Voltage - Breakdown (Min):
- 13.6V
- Voltage - Clamping (Max) @ Ipp:
- 22.6V
- Current - Peak Pulse (10/1000µs):
- 66A
- 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)
1N6471US FAQ
1.How can I place an order for 1N6471US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6471US 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 1N6471US reliable?
The price and inventory of 1N6471US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6471US is usually 5 days.
3.What payment methods are accepted for 1N6471US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6471US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6471US?
1N6471US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6471US 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 1N6471US?
For technical support, including 1N6471US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6471US requirements.
6.How does Aetrix verify that 1N6471US is sourced from the original manufacturer or authorized distributors?
All 1N6471US 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 1N6471US meets industry standards.
7.What is the process for return or replacement of 1N6471US?
All 1N6471US units undergo pre-shipment inspection (PSI). If there is an issue with 1N6471US, 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 1N6471US part is unused and in its original packaging.
Return procedure for 1N6471US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6471US Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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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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Diodes Incorporated
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