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Semtech Corporation 1N6118A
- Part No.:
- 1N6118A
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- Axial
- Datasheet:
-
1N6118A.pdf
- Description:
- TVS DIODE 25.1VWM 45.7VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,321
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Product details
Overview
1N6118A 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 1N6118A 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 insights for high-reliability surge protection design.
Technical Context
The 1N6118A employs 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 22V reverse stand-off voltage and <600nA leakage at VRWM. Its 175pF junction capacitance at 22V/1MHz and ultra-low 20mΩ dynamic resistance enable robust protection without signal integrity degradation in high-speed power bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V reverse stand-off voltage - defines maximum continuous DC bus voltage before conduction begins. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements with 2Ω source impedance. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - eliminates need for secondary ESD stages in USB Type-C and IoT interfaces. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid signal distortion on 20V power rails while enabling compact layout. |
Pinout & Package
1N6118A is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required. All six terminals are electrically grouped: three input pins (IN) and three ground pins (GND), requiring parallel connection for full 40A rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path - all three must be connected via multiple vias to internal ground plane for rated surge current handling. |
| Pins 4, 5, 6 | IN | Protected line input - connects directly to VBus or power rail; all three pins conduct surge current in parallel to minimize trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A - eliminates derating for temperature or current, simplifying margin analysis. |
| FET-based shunt topology | Replaces pn-junction TVS with active switching - reduces thermal stress and avoids junction-limited energy absorption. |
| Ultra-low dynamic resistance | 20mΩ measured between 1A–40A - delivers lower let-through voltage than TVS diodes with typical RDYN >1Ω. |
| Wide temperature stability | Clamping holds 27.5–28V from –40°C to +125°C - removes thermal derating calculations required for standard TVS devices. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary high-energy EOS suppressor placed adjacent to the Type-C receptacle, clamping transients before they reach the PD controller and power path FETs. Use Value: Maintains 27.5V clamping at 40A and 125°C - stays 10.5V below typical 38V PD controller absolute max rating, preventing latch-up or gate oxide failure. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage across the load switch's internal FET drain-source during 1kV/42Ω surges per IEC 61000-4-5. Use Value: Prevents avalanche breakdown of the load switch's integrated MOSFET by holding clamp voltage ≤28V - well below common 30V–40V VDSS ratings. |
| Notebook/Tablet 22V System Rail Protection | IoT Edge Device Power Input Protection |
Use Scenario: Securing main 22V system rails in thin-client notebooks and ruggedized tablets subjected to user-handling ESD and conducted surges from AC adapters. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV networks - handles both fast ESD (ns) and slow surge (μs) events. Use Value: 1.6mm × 1.6mm footprint saves >60% board area versus discrete TVS arrays - critical for space-constrained mobile PCBs. |
Use Scenario: Hardening 22V input rails of battery-powered IoT gateways and sensor hubs deployed in uncontrolled environments (e.g., outdoor smart meters). IC Role / Device Role / Timing Role: First-line defense against induced surges from nearby lightning strikes and electrostatic discharge during field maintenance. Use Value: ±30kV ESD rating and 40A surge capability meet IEC 61000-4-2/4-4/4-5 compliance without external filtering - reducing BOM count and validation effort. |
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; 35.1V clamping at 12.7A (8/20μs); 1.5Ω dynamic resistance; 1200W peak power. | Larger clamping voltage rise with current/temperature; requires higher IPP derating above 85°C. | Lower cost but demands thermal and current margin analysis; suitable only where 35V+ clamping is acceptable. |
| TDS2211P | Same FET-based TDS architecture; identical 22V working voltage, 27.5–28V clamping, and DFN-6 package - direct functional match. | Identical application scope and layout; marked "T22" with date code instead of "1N6118A" - same die, alternate marking. | Drop-in replacement with identical electrical and mechanical behavior; verify reel marking and traceability requirements. |
Compared with SMAJ22A, 1N6118A delivers 7.6V lower clamping at full 40A and maintains stability across temperature, enabling tighter safety margins for 24V-tolerant ICs. Against TDS2211P, it is a marking variant - identical performance, packaging, and qualification - making it a seamless sourcing alternative.
Availability
1N6118A is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and notebook 22V rail protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N6118A 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 1N6118A belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 20–24V power rail protection where stable clamping and temperature insensitivity are critical.
FAQ
What is the exact function of the 1N6118A in a circuit?
The 1N6118A functions as a transient diverting suppressor that actively shunts high-energy electrical overstress (EOS) events-such as ESD, lightning surges, and EFT-to ground using an integrated surge-rated FET. Unlike passive TVS diodes, it maintains a near-constant 27.5–28V clamping voltage across its full 40A rating and operating temperature range, protecting downstream 22V-rated ICs like USB PD controllers and load switches.
Does the 1N6118A require a thermal pad on the PCB?
No, the 1N6118A does not require a thermal pad. Its DFN-6 package dissipates surge energy through the copper traces connected to its three GND pins (1, 2, 3) and three IN pins (4, 5, 6). Semtech's datasheet explicitly states no thermal pad is needed because transient energy is handled via low-inductance routing-not steady-state thermal conduction-and recommends multiple vias to the ground plane instead.
Can the 1N6118A be used on bidirectional data lines like USB DP/DM?
No, the 1N6118A is designed exclusively for unidirectional 22V power or I/O line protection-not high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on DP/DM or SS lanes. For those, Semtech specifies low-capacitance devices like RClamp3371ZC (<0.25pF); the 1N6118A is intended only for VBus, CC, SBU, or load switch input rails.
How does the 1N6118A differ from standard TVS diodes like SMAJ22A?
The 1N6118A uses an active FET-based shunt architecture with a precision trigger circuit, delivering flat 27.5–28V clamping from 24A to 40A and across –40°C to +125°C. In contrast, SMAJ22A is a passive pn-junction TVS with 35.1V clamping at 12.7A and rising clamping voltage with current and temperature-requiring significant derating for industrial use. The 1N6118A eliminates that uncertainty.
Is the 1N6118A pin-compatible with TDS2211P?
Yes-the 1N6118A and TDS2211P share identical DFN-6 pinout (Pins 1–3 = GND, Pins 4–6 = IN), mechanical dimensions (1.6mm × 1.6mm × 0.55mm), electrical specifications, and thermal performance. They are functionally and physically interchangeable; the difference lies only in manufacturer marking and reel labeling-making 1N6118A a direct sourcing alternative to TDS2211P.
1N6118A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- Axial
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 25.1V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N6118A FAQ
1.How can I place an order for 1N6118A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6118A 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 1N6118A reliable?
The price and inventory of 1N6118A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6118A is usually 5 days.
3.What payment methods are accepted for 1N6118A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6118A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6118A?
1N6118A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6118A 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 1N6118A?
For technical support, including 1N6118A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6118A requirements.
6.How does Aetrix verify that 1N6118A is sourced from the original manufacturer or authorized distributors?
All 1N6118A 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 1N6118A meets industry standards.
7.What is the process for return or replacement of 1N6118A?
All 1N6118A units undergo pre-shipment inspection (PSI). If there is an issue with 1N6118A, 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 1N6118A part is unused and in its original packaging.
Return procedure for 1N6118A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6118A Tags
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