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Semtech Corporation 1N6121AUS
- Part No.:
- 1N6121AUS
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SQ-MELF
- Datasheet:
-
1N6121AUS.pdf
- Description:
- TVS DIODE 32.7VWM 59.1VC
- Quantity:
- Payment:
- Shipping:
Inventory:7,425
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Product details
Overview
1N6121AUS 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 24–40A, and 20mΩ dynamic resistance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the 1N6121AUS datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specifications, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and direct alternative options for 22V bus protection designs requiring low-voltage clamping with minimal thermal drift.
Technical Context
The 1N6121AUS 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 as a bidirectional shunt device with three input terminals (pins 4–6) tied to the protected line and three ground terminals (pins 1–3), requiring all six pins to be connected for full 40A rating. Its 175pF junction capacitance at 22V/1MHz and 130–600nA reverse leakage support high-speed interface protection without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - 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 surge immunity for industrial equipment and USB PD inputs. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external shielding. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise under increasing surge current. |
| Junction Capacitance | 175pF @ 22V, 1MHz - compatible with USB Type-C VBUS protection where <200pF avoids signal distortion or timing skew. |
Pinout & Package
1N6121AUS is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required - all six terminals are electrically active and must be connected per functional role to achieve rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to PCB ground plane via multiple vias to sustain 40A surge current. |
| Pins 4, 5, 6 | IN | Protected line input; tied together externally to VBUS or power rail - parallel connection reduces effective trace inductance and distributes surge current. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage vs. current | 27.5–28V over full 24–40A range - eliminates need for derating at high ambient temperatures or elevated surge levels. |
| Temperature-stable clamping | Clamping holds within ±0.5V from −40°C to +125°C - enables reliable protection in unheated industrial enclosures or thermally constrained notebooks. |
| Ultra-low dynamic resistance | 20mΩ - reduces I²R heating during surge, enabling smaller board area vs. TVS solutions requiring larger junction area. |
| High-energy EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive fast transients in motor drives and PLC I/O modules. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBUS lines in USB-C receptacles supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector placed immediately after connector, clamping transients before they reach PD controller and load switch ICs. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents false OVP trips and ensures PD negotiation remains functional after repeated ±30kV ESD events. |
Use Scenario: Securing input rails of industrial-grade load switches (e.g., HS2950P) used in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage stress on the load switch's internal FET during 1kV/42Ω surges per IEC 61000-4-5. Use Value: Clamps below 28V at 40A - keeps gate-source and drain-source voltages within safe operating area of 30V-rated load switches, avoiding latch-up or permanent failure. |
| IoT Device Power Rail Protection | Notebook/Tablet Main Power Bus Protection |
|
Use Scenario: Safeguarding 22V-capable battery charging or PoE-powered IoT edge nodes subject to field ESD and conducted surges. IC Role / Device Role / Timing Role: Single-component solution replacing multi-diode TVS arrays, integrated directly at power entry point before DC-DC converters. Use Value: 1.6mm × 1.6mm footprint saves >60% board space vs. SOD-323 TVS alternatives while delivering higher surge rating and lower clamping. |
Use Scenario: Protecting main system power bus in thin-profile notebooks and tablets where thermal headroom and board area are severely constrained. IC Role / Device Role / Timing Role: Low-capacitance (175pF), low-leakage (≤600nA) protector enabling clean power delivery without affecting battery gauge accuracy or standby current. Use Value: Stable 27.5–28V clamping at 125°C ambient - ensures protection integrity during sustained CPU/GPU thermal throttling without voltage creep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same die, identical electrical specs and DFN-6 package - confirmed pin-to-pin and functionally identical replacement. | No change in layout, BOM, or test plan required; fully interchangeable in production. | Select TDS2211P when sourcing from Semtech-authorized channels with full traceability and extended lifecycle support. |
| uClamp2411ZA | 24V working voltage, 30A IPP, 33V clamping (at 24A), 12pF capacitance - higher clamping, much lower capacitance. | Targeted at CC/SBU lines in USB-C, not VBUS; unsuitable for 22V power rail due to 33V clamping exceeding safe margin. | Choose uClamp2411ZA only for low-capacitance data-line protection; not a functional substitute for 1N6121AUS in power-rail roles. |
Compared with TDS2211P, 1N6121AUS offers identical protection performance and drop-in compatibility; versus uClamp2411ZA, it delivers 5V lower clamping and 14× higher surge rating but trades off 15pF for robustness - making it the sole validated option for 22V power-line EOS suppression.
Availability
1N6121AUS is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT power rail protection requiring stable component supply, long-term manufacturability, and guaranteed surge performance across temperature extremes.
Supply support for 1N6121AUS 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 1N6121AUS belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail applications demanding flat clamping, temperature stability, and high surge endurance.
FAQ
What is the maximum continuous operating voltage for the 1N6121AUS?
The 1N6121AUS has a reverse stand-off voltage (VRWM) of 22V, meaning it can safely block up to 22V DC or RMS voltage continuously without significant leakage or degradation. This makes it suitable for nominal 20V USB PD VBUS and other 22V-rated industrial power rails. Exceeding 22V risks premature conduction and accelerated wear.
Does the 1N6121AUS require a thermal pad or heatsink for 40A surge handling?
No - the 1N6121AUS dissipates surge energy primarily through its low-RDS(on) FET structure rather than junction heating, and its DFN-6 package does not include or require an exposed thermal pad. Layout best practice emphasizes low-inductance grounding via multiple vias to pins 1–3, not thermal mass addition.
How does the 1N6121AUS clamping voltage compare to standard TVS diodes at high temperature?
At 125°C, the 1N6121AUS maintains clamping at 27.5–28V across 24–40A, whereas typical 22V TVS diodes increase clamping to ~38V under same conditions. This 10.5V margin prevents overvoltage damage to 24V-rated downstream ICs like USB PD controllers and load switches during thermal stress.
Can the 1N6121AUS be used on high-speed data lines like USB SuperSpeed or DisplayPort?
No - the 1N6121AUS has 175pF junction capacitance, which would severely degrade signal integrity on differential high-speed lanes. It is intended exclusively for power or low-frequency I/O lines. For SuperSpeed (TX/RX) or DP lines, Semtech recommends RClamp3371ZC (0.25pF) instead.
Is the 1N6121AUS pin-compatible with other Semtech TDS devices like TDS2411P?
No - the 1N6121AUS is functionally and physically identical to TDS2211P (same pinout, same 22V rating), but TDS2411P is a 24V variant with different trigger threshold and clamping behavior. Pin compatibility does not imply functional interchangeability; substituting TDS2411P would raise clamping to ~30V and risk overvoltage on 22V systems.
1N6121AUS 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):
- 32.7V (Max)
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.1V
- Current - Peak Pulse (10/1000µs):
- 8.5A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
1N6121AUS FAQ
1.How can I place an order for 1N6121AUS through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6121AUS 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 1N6121AUS reliable?
The price and inventory of 1N6121AUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6121AUS is usually 5 days.
3.What payment methods are accepted for 1N6121AUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6121AUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6121AUS?
1N6121AUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6121AUS 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 1N6121AUS?
For technical support, including 1N6121AUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6121AUS requirements.
6.How does Aetrix verify that 1N6121AUS is sourced from the original manufacturer or authorized distributors?
All 1N6121AUS 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 1N6121AUS meets industry standards.
7.What is the process for return or replacement of 1N6121AUS?
All 1N6121AUS units undergo pre-shipment inspection (PSI). If there is an issue with 1N6121AUS, 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 1N6121AUS part is unused and in its original packaging.
Return procedure for 1N6121AUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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