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Semtech Corporation 1N6122US
- Part No.:
- 1N6122US
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SQ-MELF
- Datasheet:
-
1N6122US.pdf
- Description:
- TVS DIODE 35.8VWM 67.7VC
- Quantity:
- Payment:
- Shipping:
Inventory:3,248
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Product details
Overview
1N6122US 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. It protects USB PD, Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the 1N6122US datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, clamping stability across temperature and current, and real-world implementation insights for robust EOS protection design.
Technical Context
The 1N6122US 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 with a 22V reverse stand-off voltage (VRWM) and 25–27.9V breakdown (VBR), exhibits only 130–600nA leakage at 22V, and maintains 175pF junction capacitance at 22V/1MHz-enabling use on high-speed power rails without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Stand-Off Voltage | 22V - defines maximum continuous operating voltage before clamping activation |
| Clamping Voltage | 27.5–28V at 24–40A (8/20μs + 1.2/50μs combo wave) - ensures protected ICs stay below damage thresholds during surges |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD stress levels |
| Dynamic Resistance | 20mΩ - enables low-voltage drop under high-current transients, minimizing energy dissipation in the device |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid degrading rise/fall times on 20V power rails |
Pinout & Package
1N6122US is housed in a RoHS-compliant DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad not required-energy is dissipated in the FET channel, not the junction. All six terminals must be connected per functional role for full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three pins must be tied to low-inductance ground plane via multiple vias |
| 4, 5, 6 | IN | Protected line input (e.g., USB PD VBus); all three pins must be shorted together and routed directly from connector |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A and −40°C to +125°C-eliminates derating uncertainty vs. TVS diodes |
| FET-based shunt topology | Surge energy diverted through low-RDS(on) channel instead of PN-junction-reduces thermal stress and improves longevity |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz bursts)-protects against repetitive switching noise in motor drives and PLCs |
| Ultra-low dynamic resistance | 20mΩ enables <1V IR drop at 40A-preserves voltage margin for downstream 22V-tolerant controllers |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V USB PD VBus lines from lightning-induced surges and connector hot-plug ESD events. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed at Type-C receptacle, clamping transients before they reach PD controller or e-fuse. Use Value: Maintains 27.5–28V clamp across full temperature range-ensures PD controller (e.g., STUSB4500, TUSB7320) stays within absolute max ratings even at 125°C ambient. |
Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P, TPS22990) in remote meters and robotics against 1kV/42Ω surges. IC Role / Device Role / Timing Role: Front-end transient limiter that prevents gate oxide damage and overvoltage failure of internal MOSFETs in load switches. Use Value: 40A surge handling and stable clamping prevent latch-up or catastrophic failure during field-deployed surge exposure. |
| IoT Device DC Power Rail Protection | Notebook/Tablet Main Power Input Protection |
Use Scenario: Securing 12–24V DC input rails in battery-powered IoT gateways exposed to ESD and induced surges in unshielded enclosures. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV designs-reducing BOM count and PCB area. Use Value: 1.6mm × 1.6mm footprint saves >60% board space vs. SOD-123 TVS alternatives while delivering superior clamping consistency. |
Use Scenario: Protecting main system power input (e.g., barrel jack or USB-C port) in thin-client notebooks against accidental 1.2/50μs surges during docking/undocking. IC Role / Device Role / Timing Role: Fast-acting shunt device placed immediately after input connector, before EMI filter and buck converter. Use Value: 175pF capacitance avoids resonance with input filter inductors-prevents instability in 300kHz–2MHz DC/DC regulators. |
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 12.9A (8/20μs); higher dynamic resistance (~0.5Ω); clamping rises with current/temp | Limited to lower-energy surges; requires derating above 85°C; unsuitable for 40A or wide-temp industrial use | Use only where cost is critical and surge energy is <50% of 1N6122US rating-requires thermal and current derating analysis |
| TDS2211P | Same architecture, identical electrical specs, and pinout; differs only in marking code and reel packaging (TDS2211P.C = 3,000/reel; 1N6122US = standard orderable part number) | No functional difference-Semtech lists both as valid orderables for identical design use cases | Select 1N6122US for standard procurement; TDS2211P.C if sourcing from distributor tape-and-reel inventory |
Compared with SMAJ22A, 1N6122US delivers 40A surge handling and flat clamping across temperature-critical for industrial reliability-while TDS2211P is a direct form-fit-function match with no design change required.
Availability
1N6122US is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT DC power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for 1N6122US 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 1N6122US belongs to Semtech's Transient Diverting Suppressor (TDS) family-engineered to replace traditional TVS diodes in high-reliability 20–24V power rail protection with superior clamping stability and surge endurance.
FAQ
What is the key functional difference between 1N6122US and standard TVS diodes?
The 1N6122US uses a surge-rated FET with precision trigger circuitry to achieve near-constant clamping voltage (27.5–28V) across 24–40A and −40°C to +125°C. In contrast, standard TVS diodes exhibit rising clamping (VC = VBR + IPP × RDYN) due to fixed dynamic resistance-making 1N6122US more predictable and robust in demanding industrial environments.
Can 1N6122US be used on USB Type-C superspeed data lines (TX/RX)?
No-1N6122US is rated for 175pF junction capacitance at 22V, which is too high for USB 3.x/3.2 superspeed differential pairs requiring <0.25pF. It is intended exclusively for VBus, CC, SBU, or power rail protection. For data lines, Semtech recommends RClamp3371ZC (0.15pF) alongside 1N6122US in complete Type-C solutions.
Does 1N6122US require a thermal pad or heatsink on the PCB?
No. The 1N6122US dissipates surge energy in the FET channel rather than the PN junction, eliminating need for thermal pads or copper pour heatsinking. Layout emphasis is on low-inductance grounding: connect all GND pins (1–3) to a solid ground plane using ≥3 vias per pin, and route IN pins (4–6) as a single short trace from the connector.
What is the minimum recommended PCB trace width for 1N6122US input routing?
For 40A peak pulse current handling, Semtech recommends a minimum 1.5mm-wide trace (2oz copper) for the IN net connecting pins 4–6 to the protected connector. Narrower traces increase parasitic inductance, raising clamping voltage during fast-rising transients-verified in application note AN-TDS2211P-LAYOUT.
Is 1N6122US compatible with lead-free reflow profiles?
Yes-1N6122US is Pb-free, halogen-free, and RoHS/WEEE compliant. Its DFN-6 package supports standard IPC/JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C for 30 seconds. Molding compound meets UL 94V-0 flammability rating, ensuring process compatibility and safety compliance.
1N6122US 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):
- 35.8V (Max)
- Voltage - Breakdown (Min):
- 4.3V
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
1N6122US FAQ
1.How can I place an order for 1N6122US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6122US 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 1N6122US reliable?
The price and inventory of 1N6122US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6122US is usually 5 days.
3.What payment methods are accepted for 1N6122US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6122US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6122US?
1N6122US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6122US 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 1N6122US?
For technical support, including 1N6122US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6122US requirements.
6.How does Aetrix verify that 1N6122US is sourced from the original manufacturer or authorized distributors?
All 1N6122US 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 1N6122US meets industry standards.
7.What is the process for return or replacement of 1N6122US?
All 1N6122US units undergo pre-shipment inspection (PSI). If there is an issue with 1N6122US, 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 1N6122US part is unused and in its original packaging.
Return procedure for 1N6122US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6122US Tags
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