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Semtech Corporation 1N6122
- Part No.:
- 1N6122
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- Axial
- Datasheet:
-
1N6122.pdf
- Description:
- TVS DIODE 35.8VWM 67.7VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,765
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Product details
Overview
1N6122 from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power 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 Type-C power delivery buses, load switch inputs, and industrial interfaces where stable clamping under temperature and current stress is critical.
For engineers reviewing the 1N6122 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and two validated alternative suppressors with documented clamping and thermal behavior differences.
Technical Context
The 1N6122 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 across 24–40A (8/20μs) due to decreasing RDS(on), not fixed dynamic resistance.
It operates from −40°C to +125°C with stable 27.5–28V clamping up to 125°C, while maintaining <600nA reverse leakage at 22V and 175pF junction capacitance at 1MHz/22V - enabling robust protection without signal integrity compromise in high-speed bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common USB PD controllers and load switches. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and IoT gateways. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external staging. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for USB Type-C VBUS line protection without affecting power delivery timing. |
| Operating Temp | −40°C to +125°C - supports extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
1N6122 is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. All six terminals are surface-mount; no thermal pad required - energy dissipation occurs within the active FET structure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to minimize inductance and maximize 40A handling. |
| 4, 5, 6 | IN | Protected line input (e.g., USB PD VBUS); parallel connection ensures uniform current sharing and optimal clamping stability. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based clamping architecture | Delivers near-constant 27.5–28V clamping from 24A to 40A - eliminates voltage rise seen in TVS diodes and simplifies margin analysis. |
| Temperature-stable clamping | Clamping voltage drift <0.5V from −40°C to +125°C - enables reliable protection in uncontrolled thermal environments. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - reduces I×R voltage drop during surge, preserving downstream voltage headroom. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in motor drives and PLC I/O modules. |
| Small-footprint DFN-6 | 1.6mm × 1.6mm area - saves >60% board space vs. SO-8 TVS solutions while supporting same 40A surge rating. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the VBUS line of a USB Type-C port supporting up to 20V/5A power delivery in notebooks and docking stations. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, shunting lightning-induced surges and ESD before reaching the PD controller IC. Use Value: Maintains 27.5–28V clamping across full temperature range and 40A surge, preventing latch-up or gate oxide damage in USB PD controllers rated for ≤30V absolute max. |
Use Scenario: Safeguarding the input of an e-fuse or load switch (e.g., HS2950P) in remote metering or robotics power distribution units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on the high-side input rail, limiting transient voltage to protect internal MOSFET gate oxide and current-sense circuitry. Use Value: Prevents destructive overvoltage events from exceeding the 30V maximum drain-source rating of integrated load switches during 1kV/42Ω IEC 61000-4-5 surges. |
| IoT Gateway DC Power Input | Industrial USB Hub VBUS Line |
|
Use Scenario: Securing the 24V DC input of an edge IoT gateway exposed to field wiring transients in factory automation networks. IC Role / Device Role / Timing Role: First-line transient suppressor on the main power entry, coordinated with upstream fuse and downstream DC-DC converter. Use Value: Absorbs 1120W peak pulse power (8/20μs) without degradation, ensuring uninterrupted operation after repeated 40A surges in harsh electromagnetic environments. |
Use Scenario: Protecting the shared VBUS line of a multi-port industrial USB hub used in control panels and HMI systems. IC Role / Device Role / Timing Role: Common-mode clamp for the 5V/20V VBUS rail, suppressing coupled surges from adjacent AC mains or relay switching noise. Use Value: Delivers ±30kV ESD immunity and 4kV EFT robustness - meeting IEC 61000-6-2 and -6-4 immunity requirements for Class A industrial equipment. |
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; clamps at ~37V @ 40A (8/20μs), increases with temperature; 1.5Ω dynamic resistance. | Larger voltage margin required for downstream ICs; unsuitable where clamping must stay <30V at 125°C. | Select SMAJ22A only if cost is primary constraint and system allows ≥35V clamping at elevated temperature. |
| TDS2211P | Same FET-based architecture, identical 22V working voltage and 40A rating, but marked TDS2211P - confirmed pinout and performance match per Semtech documentation. | Direct functional and mechanical replacement; same DFN-6 footprint and thermal profile. | TDS2211P is a manufacturer-confirmed alternate with identical specifications and marking code T22 - suitable for BOM consolidation. |
Compared with SMAJ22A and TDS2211P, the 1N6122 offers identical clamping stability and thermal behavior as TDS2211P but differs in part numbering and tape-and-reel packaging; versus SMAJ22A, it provides 9V lower clamping at 40A and eliminates temperature-dependent voltage rise - critical for USB PD and high-reliability industrial designs.
Availability
1N6122 is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch protection circuits, and IoT gateway DC input stages requiring stable component supply, long-term lifecycle support, and guaranteed surge performance compliance.
Supply support for 1N6122 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 power management, protection, and signal integrity.
The 1N6122 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V bus protection applications where stable clamping and temperature independence are mandatory.
FAQ
What is the exact clamping voltage of the 1N6122 at 40A surge current?
The 1N6122 clamps at 27.5–28V under IEC 61000-4-5 combination waveform conditions (1.2/50μs voltage, 8/20μs current, 2Ω source impedance) at 40A peak pulse current. This value is guaranteed across −40°C to +125°C and reflects the device's FET-based architecture, not a fixed-voltage Zener-like response.
Is the 1N6122 pin-compatible with standard TVS diodes like SMAJ22A?
No - the 1N6122 uses a 6-pin DFN package with three GND pins (1–3) and three IN pins (4–6), whereas SMAJ22A is a 2-pin DO-214AC package. PCB layout, routing, and grounding strategy differ fundamentally; direct substitution requires board redesign.
Does the 1N6122 require a thermal pad or heatsink for 40A surge handling?
No - the 1N6122 dissipates surge energy within its internal FET structure and does not rely on thermal conduction through a die paddle. Semtech explicitly states no thermal pad is needed; instead, low-inductance grounding via all three GND pins is critical for achieving rated 40A performance.
Can the 1N6122 be used to protect high-speed data lines like USB SuperSpeed differential pairs?
No - the 1N6122 has 175pF junction capacitance, making it unsuitable for data lines. It is intended exclusively for VBUS, CC, SBU, or power rail protection. For SuperSpeed TX/RX lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF).
What is the reverse leakage current specification for the 1N6122 at 22V and 85°C?
At 22V reverse stand-off voltage and 85°C, the 1N6122 exhibits reverse leakage current between 130nA and 600nA, per its datasheet Electrical Characteristics table. This low leakage ensures minimal standby power loss and avoids false triggering in always-on industrial systems.
1N6122 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):
- 35.8V (Max)
- Voltage - Breakdown (Min):
- 42.3V
- Voltage - Clamping (Max) @ Ipp:
- 67.7V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N6122 FAQ
1.How can I place an order for 1N6122 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6122 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 1N6122 reliable?
The price and inventory of 1N6122 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6122 is usually 5 days.
3.What payment methods are accepted for 1N6122?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6122 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6122?
1N6122 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6122 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 1N6122?
For technical support, including 1N6122 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6122 requirements.
6.How does Aetrix verify that 1N6122 is sourced from the original manufacturer or authorized distributors?
All 1N6122 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 1N6122 meets industry standards.
7.What is the process for return or replacement of 1N6122?
All 1N6122 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6122, 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 1N6122 part is unused and in its original packaging.
Return procedure for 1N6122:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6122 Tags
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