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Semtech Corporation 1N6156US
- Part No.:
- 1N6156US
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SQ-MELF
- Datasheet:
-
1N6156US.pdf
- Description:
- TVS DIODE 5.2VWM 56.2VC
- Quantity:
- Payment:
- Shipping:
Inventory:6,359
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Product details
Overview
1N6156US 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), and stable 27.5–28V clamping across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch inputs.
For engineers reviewing the 1N6156US datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection in high-reliability embedded systems.
Technical Context
The 1N6156US 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 - enabling near-constant clamping voltage independent of peak pulse current magnitude. Its dynamic resistance is just 20 mΩ (measured 1–40A, 8/20μs), far lower than standard TVS diodes.
Unlike conventional TVS devices whose clamping voltage rises linearly with IPP (VC = VBR + IPP × RDYN), the 1N6156US maintains clamping at ~27.6–28V from 24A to 40A and across –40°C to +125°C - due to decreasing RDS(on) under surge, not fixed junction resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - supports continuous operation on 20V USB PD bus and industrial 24V nominal rails without leakage or degradation. |
| Clamping Voltage | 27.5–28 V @ 40A (8/20μs + 1.2/50μs combo wave, RS = 2Ω) - stays below 29V across full rated surge range, protecting 30V-tolerant controllers. |
| Peak Pulse Current | 40 A (tp = 8/20μs) - meets IEC 61000-4-5 Level 4 (±1kV, RS = 42Ω) with margin for industrial surge immunity. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without derating. |
| Junction Capacitance | 175 pF @ 22 V, 1 MHz - low enough for DC power rail and medium-speed signal line protection (e.g., load switch enable, CC lines). |
| Dynamic Resistance | 20 mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Reverse Leakage | 130–600 nA @ 22 V - negligible power loss and thermal impact in always-on 22V systems. |
Pinout & Package
1N6156US is housed in a RoHS-compliant DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed thermal pad (no solder mask defined). All six terminals must be connected per functional role to achieve rated 40A surge capability and optimal thermal dissipation.
| 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); all three pins are internally paralleled and must be shorted externally to maximize current sharing and reduce trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables constant clamping voltage over 24–40A surge range - eliminates design margin inflation required with TVS diodes. |
| Low dynamic resistance | 20 mΩ ensures minimal IR drop during surge, preserving system-level voltage integrity downstream of protection. |
| Stable clamping vs. temperature | Clamping remains 27.6–28 V from –40°C to +125°C - removes thermal derating calculations for industrial and automotive ambient conditions. |
| DFN-6 footprint | 1.6 mm × 1.6 mm saves >60% board area vs. SOT-23 or SO-8 TVS solutions while supporting same 40A rating. |
| UL 94V-0 molding compound | Ensures flame-retardant reliability in enclosed industrial enclosures and portable electronics with strict safety certifications. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C PD ports against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the Type-C receptacle, shunting surge energy to ground before it reaches the PD controller or buck converter. Use Value: Maintains clamping ≤28V across full temperature range and 40A surge, preventing damage to 30V-rated PD controllers without over-specifying IPP. |
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: Primary front-end EOS protector that limits voltage stress on the load switch's internal MOSFET gate oxide and drain-source junction. Use Value: Prevents premature failure of load switches during 1kV/42Ω surges by holding clamping voltage well below 30V absolute maximum ratings. |
| IoT Device Power Rail Protection | Storage Device 22V Bus Protection |
Use Scenario: Securing 22V supply rails in battery-powered IoT gateways exposed to ESD during field servicing or environmental transients. IC Role / Device Role / Timing Role: Low-leakage (≤600 nA), low-capacitance (175 pF) protector enabling always-on operation without battery drain or signal distortion. Use Value: Delivers ±30kV ESD robustness and 40A surge handling in ultra-compact DFN-6, critical for space-constrained edge nodes. |
Use Scenario: Shielding 22V auxiliary rails in NVMe SSD enclosures and enterprise storage backplanes from system-level coupling transients. IC Role / Device Role / Timing Role: High-power transient suppressor mounted adjacent to power connectors to intercept surges before reaching PMICs or voltage supervisors. Use Value: Achieves 1120 W peak pulse power handling in 1.6 mm² footprint - enabling dense, thermally efficient protection layouts. |
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 rises to ~42V @ 40A (8/20μs); higher dynamic resistance (~0.5Ω); no temperature stability. | Acceptable only where clamping <30V is not required and ambient temperature stays near 25°C. | Choose SMAJ22A only if cost is primary concern and system-level clamping margin allows ≥40V excursion. |
| TDS2211P | Same FET-based TDS architecture, identical 22V working voltage, 40A rating, and DFN-6 package - but differs in marking code and reel packaging (TDS2211P.C vs. 1N6156US). | Functionally identical; used interchangeably in Semtech's documentation and reference designs for USB-C and load switch protection. | Select TDS2211P when sourcing from authorized distributors with full traceability; 1N6156US is the same die in alternate branding. |
Compared with SMAJ22A, 1N6156US delivers 14V lower clamping at 40A and stable performance across temperature - critical for 30V-tolerant ICs. Against TDS2211P, 1N6156US is a direct functional and physical match with identical electrical specs, pinout, and thermal behavior.
Availability
1N6156US is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT device power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.
Supply support for 1N6156US 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 connectivity in industrial, communications, and consumer markets.
The 1N6156US belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered to replace conventional TVS diodes in high-reliability 20–24V systems where flat clamping, temperature stability, and compact size are mandatory.
FAQ
What is the clamping voltage of the 1N6156US at 40A surge current?
The 1N6156US clamps at 27.6–28 V under IEC 61000-4-5 combination waveform (1.2/50μs voltage + 8/20μs current, RS = 2Ω) at 40A peak pulse current. This value is guaranteed across –40°C to +125°C and reflects its FET-based architecture - unlike TVS diodes, clamping does not increase with current or temperature. The 1N6156US achieves this via low RDS(on) and precision trigger control.
Is the 1N6156US pin-compatible with standard TVS diodes like SMAJ22A?
No - the 1N6156US uses a 6-pin DFN package with three parallel input pins (4,5,6) and three parallel ground pins (1,2,3), whereas SMAJ22A is a 2-pin DO-214AC device. PCB layout, trace routing, and grounding strategy for the 1N6156US must follow Semtech's DFN-6 layout guidelines - including multi-via ground connections and single-point input trace routing. The 1N6156US is not a drop-in replacement.
Does the 1N6156US require a thermal pad or heatsink on the PCB?
No - the 1N6156US dissipates surge energy primarily through conduction into the PCB ground plane, not junction heating. Semtech explicitly states "no thermal pad is needed" in the datasheet. Instead, design focus should be on low-inductance grounding: connect all GND pins (1,2,3) to a solid internal or bottom-layer ground plane using ≥3 vias per pin, placed within 2 mm of each pad.
Can the 1N6156US protect high-speed data lines such as USB SS or PCIe?
No - with 175 pF junction capacitance, the 1N6156US is intended for DC power rails and low-to-medium speed control lines (e.g., load switch EN, CC lines), not high-speed differential pairs. For USB SuperSpeed (5+ Gbps) or PCIe lanes, Semtech recommends sub-0.25 pF devices like RClamp3371ZC. Using the 1N6156US on such lines would cause severe signal integrity degradation.
What is the maximum operating temperature range for the 1N6156US?
The 1N6156US is rated for continuous operation from –40°C to +125°C ambient temperature, with junction temperature up to +150°C. Its clamping voltage and leakage current remain fully specified across this range - a key differentiator from TVS diodes, whose clamping degrades above 85°C. This makes the 1N6156US suitable for under-hood automotive modules and sealed industrial enclosures.
1N6156US Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SQ-MELF
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 5.2V (Max)
- Voltage - Breakdown (Min):
- 35.1V
- Voltage - Clamping (Max) @ Ipp:
- 56.2V
- Current - Peak Pulse (10/1000µs):
- 26.7A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
1N6156US FAQ
1.How can I place an order for 1N6156US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6156US 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 1N6156US reliable?
The price and inventory of 1N6156US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6156US is usually 5 days.
3.What payment methods are accepted for 1N6156US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6156US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6156US?
1N6156US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6156US 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 1N6156US?
For technical support, including 1N6156US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6156US requirements.
6.How does Aetrix verify that 1N6156US is sourced from the original manufacturer or authorized distributors?
All 1N6156US 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 1N6156US meets industry standards.
7.What is the process for return or replacement of 1N6156US?
All 1N6156US units undergo pre-shipment inspection (PSI). If there is an issue with 1N6156US, 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 1N6156US part is unused and in its original packaging.
Return procedure for 1N6156US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6156US Tags
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Diodes Incorporated
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Nexperia USA Inc.
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