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Semtech Corporation 1N6121
- Part No.:
- 1N6121
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- Axial
- Datasheet:
-
1N6121.pdf
- Description:
- TVS DIODE 32.7VWM 62VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,860
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Product details
Overview
1N6121 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 ultra-low 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the 1N6121 datasheet, pinout, applications, or equivalent options, this device offers constant clamping across temperature and current-critical for robust protection of 22V bus interfaces where conventional TVS diodes exhibit rising clamping with IPP and temperature.
Technical Context
The 1N6121 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 standard TVS diodes, its clamping voltage remains stable due to decreasing RDS(on) under surge, not fixed junction resistance.
It operates over –40°C to +125°C, maintains ≤600nA reverse leakage at 22V, exhibits only 175pF junction capacitance at 22V/1MHz, and delivers 1120W peak pulse power-enabling reliable protection in space-constrained, thermally demanding applications like USB Type-C PD ports and industrial load switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD VBus and industrial 24V rail derating requirements. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common 30V-rated load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity (±1kV, RS=42Ω) for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC 61000-4-2 Class 4 requirements for end-user interface robustness. |
| Dynamic Resistance | 20mΩ - enables low-voltage-drop shunting, minimizing energy dissipation in the protected IC rather than the suppressor. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with DC-coupled 22V power rails; not suitable for high-speed data lines without additional low-C TVS. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - provides 70% board area reduction vs. SO-8 TVS, enabling placement directly at USB-C connector pads. |
Pinout & Package
1N6121 is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm package with exposed thermal pad (not electrically connected). All six terminals are surface-mount; pins 1–3 are GND, pins 4–6 are IN - requiring parallel connection of all three GND and all three IN terminals for full 40A rating.
| 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 achieve rated 40A capability. |
| 4, 5, 6 | IN | Input node tied to protected line (e.g., USB PD VBus); all three must be bonded to ensure uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across 24–40A and –40°C to +125°C - eliminates design margin uncertainty caused by TVS voltage drift. |
| FET-based shunt architecture | Replaces PN-junction avalanche with low-RDS(on) switching - reduces thermal stress and enables higher surge repetition rates. |
| Low dynamic resistance | 20mΩ - limits IR drop during surge, preserving voltage integrity for downstream regulators and controllers. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - ensures reliability in noisy industrial environments with motor drives and PLCs. |
| Small-footprint DFN | 1.6 × 1.6 mm - fits within 2.0 mm clearance from USB-C receptacle edge, enabling optimal placement for minimal trace inductance. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBus line of a USB-C port supporting up to 20V/5A PD negotiation against lightning-induced surges and hot-plug transients. IC Role / Device Role / Timing Role: Transient diverting suppressor placed between VBus and system ground, triggered within nanoseconds of overvoltage detection. Use Value: Maintains clamping at ≤28V across temperature and current-preventing latch-up or gate oxide damage in PD controllers rated for 30V absolute maximum. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., HS2950P) powering remote sensors or actuators in metering or robotics systems. IC Role / Device Role / Timing Role: Primary front-end EOS protector absorbing 40A surges before they reach the load switch's internal FET drain-source junction. Use Value: Prevents permanent degradation of the load switch's RDS(on) and overvoltage failure by limiting transient voltage to 28V, well below typical 30–40V FET breakdown ratings. |
| IoT Device DC Power Rail Protection | Notebook/Tablet Main Power Input Protection |
Use Scenario: Securing the 12–24V DC input of battery-powered IoT gateways exposed to ESD during field servicing or lightning-induced coupling in outdoor enclosures. IC Role / Device Role / Timing Role: Standalone transient suppressor on main power entry, operating continuously across –40°C to +85°C ambient. Use Value: Delivers stable 28V clamping at 40A without derating-enabling single-device protection instead of stacked TVS arrays, reducing BOM count and PCB area. |
Use Scenario: Protecting the 20V input stage of ultrabooks or 2-in-1 tablets using USB-C PD charging, where space and thermal constraints limit discrete protection options. IC Role / Device Role / Timing Role: Compact, low-profile suppressor mounted adjacent to the USB-C receptacle to minimize loop inductance during fast-rising ESD events. Use Value: 175pF capacitance avoids signal integrity issues on DC rails, while 1.6 × 1.6 mm footprint allows placement in tight keep-out zones near connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Semtech TDS2211P | Same silicon die, identical electrical specs and package - direct manufacturer-recommended replacement for 1N6121; marked "T22" with date code. | No functional difference; used interchangeably in production for USB-C and industrial designs. | Select TDS2211P when sourcing from Semtech's official channel or requiring traceable lot documentation. |
| Littelfuse SP3022-01ETG | TVS diode (not TDS architecture); 24V working voltage, 33.6V clamping at 20A, 350pF capacitance - higher clamping, higher C, no constant-VC behavior. | Suitable for lower-energy ESD-only scenarios; not recommended for 40A surge or high-temp industrial use due to voltage drift. | Choose SP3022-01ETG only if legacy TVS layout exists and 28V clamping margin is unavailable; verify thermal derating at >85°C. |
Compared with 1N6121, TDS2211P offers identical performance and sourcing continuity, while SP3022-01ETG trades clamping stability and surge capacity for broader distributor availability-making 1N6121 optimal for new designs demanding predictable, temperature-invariant protection.
Availability
1N6121 is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch protection, and IoT DC power rail hardening requiring stable component supply and long-term lifecycle support.
Supply support for 1N6121 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 precision sensing, protection, and signal integrity.
The 1N6121 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection where clamping voltage stability across temperature and current is critical.
FAQ
What is the exact function of the 1N6121 in a circuit?
The 1N6121 functions as a transient diverting suppressor that shunts high-energy electrical overstress (EOS) events-such as ESD, lightning surges, and EFT-to ground via an integrated surge-rated FET. Unlike TVS diodes, it maintains a stable ~28V clamping voltage across its full 40A surge rating and operating temperature range, protecting downstream 22V-rated components like USB PD controllers and load switches.
Does the 1N6121 require external bias or control signals to operate?
No, the 1N6121 is fully passive and self-triggering. It contains an integrated precision trigger circuit that activates the internal shunt FET automatically when transient voltage exceeds its breakdown threshold (~25–27.9V). No external power, enable pins, or configuration are needed-making it a drop-in solution for existing 22V rail protection layouts.
Can the 1N6121 be used on high-speed data lines like USB SuperSpeed or PCIe?
No, the 1N6121 is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V would severely degrade signal integrity on differential pairs operating above 100 Mbps. It is designed exclusively for DC-coupled power or low-frequency I/O lines (e.g., USB PD VBus, CC lines with separate low-C TVS, or load switch inputs). For data lines, Semtech recommends RClamp3371ZC (<0.25pF).
How does the 1N6121's clamping performance compare to standard TVS diodes at elevated temperatures?
At 125°C, the 1N6121 maintains clamping at ~28V across 24–40A, whereas conventional 22V TVS diodes typically rise to ~38V at the same conditions due to positive temperature coefficient of dynamic resistance. This 10V margin prevents overvoltage damage to sensitive 30V-rated ICs in thermally constrained enclosures-confirmed by Figure 3 in the official datasheet.
What PCB layout practices maximize the 1N6121's 40A surge capability?
To achieve full 40A rating, connect all three GND pins (1–3) and all three IN pins (4–6) in parallel using short, wide copper traces; place the 1N6121 within 3 mm of the protected connector; use ≥4 vias per GND pin to a solid ground plane; and avoid thermal relief on GND pads. These practices minimize parasitic inductance, ensuring rapid current sharing and preventing localized overheating during surge events.
1N6121 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):
- 32.7V (Max)
- Voltage - Breakdown (Min):
- 38.7V
- Voltage - Clamping (Max) @ Ipp:
- 62V
- Current - Peak Pulse (10/1000µs):
- 8.1A
- 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
1N6121 FAQ
1.How can I place an order for 1N6121 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6121 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 1N6121 reliable?
The price and inventory of 1N6121 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6121 is usually 5 days.
3.What payment methods are accepted for 1N6121?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6121 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6121?
1N6121 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6121 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 1N6121?
For technical support, including 1N6121 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6121 requirements.
6.How does Aetrix verify that 1N6121 is sourced from the original manufacturer or authorized distributors?
All 1N6121 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 1N6121 meets industry standards.
7.What is the process for return or replacement of 1N6121?
All 1N6121 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6121, 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 1N6121 part is unused and in its original packaging.
Return procedure for 1N6121:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6121 Tags
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