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Semtech Corporation 1N6123
- Part No.:
- 1N6123
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- Axial
- Datasheet:
-
1N6123.pdf
- Description:
- TVS DIODE 38.8VWM 73.5VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,944
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Product details
Overview
1N6123 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 1N6123 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, 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 1N6123 uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when voltage exceeds breakdown - enabling near-constant clamping voltage independent of peak pulse current magnitude. Its dynamic resistance is just 20mΩ (8/20μs), far lower than standard TVS diodes.
Unlike conventional TVS devices whose clamping voltage rises linearly with IPP and temperature, the 1N6123 maintains ≤28V clamping from −40°C to +125°C at 24A and 40A pulses - critical for USB PD controllers and load switches where overvoltage margin is tight and ambient temperatures vary widely.
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 40A (8/20μs + 1.2/50μs combo wave) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD test levels, eliminating need for additional pre-filtering stages. |
| Junction Capacitance | 175pF @ 22V, 1MHz - low enough for DC power rail protection without affecting load switch response or causing instability in feedback loops. |
| Dynamic Resistance | 20mΩ (8/20μs) - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
| Operating Temperature | −40°C to +125°C - supports deployment in extended-temperature industrial and automotive under-hood environments. |
Pinout & Package
1N6123 is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no solder mask defined). All six terminals are required for full 40A surge rating: three parallel ground pins and three parallel input pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to solid ground plane via multiple vias to sustain 40A surge current without voltage bounce. |
| 4, 5, 6 | IN | Protected line input; pins are internally paralleled - must be routed as single low-impedance trace from connector to device to minimize inductance and ensure uniform current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables <28V clamping at 40A while conventional TVS would exceed 38V - directly protects 24V-rated USB PD controllers without derating. |
| Temperature-stable clamping | Clamping remains ≤28V from −40°C to +125°C - eliminates thermal derating calculations and ensures consistent protection across environmental extremes. |
| Ultra-low dynamic resistance | 20mΩ allows rapid current diversion with minimal IR drop - reduces overshoot during sub-100ns ESD events and improves system-level EMC robustness. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) supports repeated lightning-surge testing per IEC 61000-4-5 without parameter shift or failure. |
| DFN-6 footprint | 1.6mm × 1.6mm area saves >60% board space vs. SOT-23 TVS solutions - ideal for compact USB Type-C connectors and portable industrial sensors. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB Type-C ports supporting up to 20V/5A PD negotiation against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed immediately after the Type-C receptacle, before the PD controller and load switch. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - prevents latch-up or gate oxide damage in 24V-rated PD controllers (e.g., STUSB4500, TUSB7320) where legacy TVS would exceed safe margins. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P, TPS229xx) in remote meters, robotics, and IoT edge nodes exposed to field surges. IC Role / Device Role / Timing Role: Front-end transient clamp that limits voltage seen by the load switch's internal MOSFET drain, preventing avalanche failure or SOA violation. Use Value: Clamps within 28V at full 40A surge - keeps stress below the 30V absolute max rating of common 24V load switches, extending reliability in ungrounded or floating installations. |
| IoT Sensor Node Power Rail Protection | Industrial USB Hub Port Protection |
|
Use Scenario: Securing 22V auxiliary power rails feeding cellular modems, GNSS receivers, or AI inference accelerators in battery-backed outdoor gateways. IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input, operating in parallel with upstream e-fuse and downstream LDOs. Use Value: 175pF capacitance avoids interaction with 100kHz–1MHz switching regulators; −40°C to +125°C operation ensures uptime in desert or arctic deployments without thermal shutdown. |
Use Scenario: Hardening individual downstream USB 2.0/3.2 ports in industrial-grade hubs used in factory automation and machine vision systems. IC Role / Device Role / Timing Role: Per-port transient suppressor on VBUS line, placed adjacent to each Type-A receptacle to prevent cross-port coupling during ESD events. Use Value: Compact DFN-6 footprint allows placement directly at each port without crowding PCB real estate - critical when supporting 4–7 simultaneous ports in DIN-rail enclosures. |
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; 22V VRWM, 35.5V clamping at 12.3A (8/20μs); 600W peak power; SMC package. | Larger footprint (7.1mm × 6.2mm), higher clamping voltage, and strong temperature dependence - requires derating above 85°C. | Choose SMAJ22A only if cost is primary constraint and surge energy is limited to ≤12A; not suitable for USB PD or high-temp industrial use. |
| TPD2E007DBVR | Low-capacitance (3.5pF) dual-channel ESD protector; 22V working voltage; ±12kV contact ESD; 1.5A peak pulse; SOT-23-6. | Designed for data-line ESD only - lacks energy handling for power-line surges; no 40A capability or 1.2/50μs waveform support. | Use TPD2E007DBVR for DP/DM or CC lines in same USB-C design; never as substitute for 1N6123 on VBUS - insufficient for IEC 61000-4-5 compliance. |
Compared with SMAJ22A and TPD2E007DBVR, the 1N6123 uniquely delivers 40A surge handling with <28V clamping across full temperature range in a 1.6mm² footprint - making it the only option qualified for 22V USB PD input and industrial load switch protection without thermal or layout compromises.
Availability
1N6123 is available at Aetrix Electronics and suitable for USB Type-C power delivery interfaces, industrial load switch inputs, and IoT sensor node power rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for 1N6123 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 - with leadership in transient suppression, LoRa® wireless, and signal integrity solutions.
The 1N6123 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 stable clamping, temperature independence, and compact size are mandatory.
FAQ
What is the clamping voltage of the 1N6123 at 40A surge current?
The 1N6123 clamps at 27.6–28V under IEC 61000-4-5 combination waveform conditions (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 1N6123 achieves this via ultra-low 20mΩ dynamic resistance and precision trigger control.
Is the 1N6123 pin-compatible with standard TVS diodes like SMAJ22A?
No, the 1N6123 is not pin-compatible with SMAJ22A or other two-terminal TVS diodes. It uses a 6-pin DFN package with three parallel input pins (4,5,6) and three parallel ground pins (1,2,3), requiring dedicated PCB layout with multi-via grounding and single-point input routing. SMAJ22A uses a 2-pin SMC package - direct replacement would require full board redesign and fails to deliver the 1N6123's stable clamping performance.
Can the 1N6123 be used to protect USB 3.2 SuperSpeed data lines?
No, the 1N6123 is not suitable for USB 3.2 SuperSpeed (TX/RX) data line protection. Its 175pF junction capacitance would severely degrade signal integrity at 5+ Gbps. For those lines, Semtech recommends low-capacitance ESD protectors like RClamp3371ZC (<0.25pF). The 1N6123 is intended exclusively for VBUS, CC, SBU, or power-rail protection where bandwidth is not a constraint.
Does the 1N6123 require a thermal pad or heatsink on the PCB?
No, the 1N6123 does not require a thermal pad or external heatsink. Its FET-based architecture dissipates surge energy primarily through conduction rather than junction heating, and the DFN-6 package is rated for full 40A surge without thermal derating. Layout best practice is to connect all three GND pins to a solid ground plane using ≥4 vias - not to add copper pour for thermal mass.
What is the maximum continuous reverse leakage current of the 1N6123 at 22V?
The 1N6123 exhibits a maximum reverse leakage current of 600nA at VRWM = 22V and TA = 25°C, with typical value of 130nA. Leakage remains below 1μA across its full operating temperature range (−40°C to +125°C), ensuring negligible standby power loss in battery-operated IoT nodes and avoiding false triggering of upstream UVLO circuits.
1N6123 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):
- 38.8V (Max)
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 6.8A
- 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
1N6123 FAQ
1.How can I place an order for 1N6123 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6123 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 1N6123 reliable?
The price and inventory of 1N6123 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6123 is usually 5 days.
3.What payment methods are accepted for 1N6123?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6123 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6123?
1N6123 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6123 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 1N6123?
For technical support, including 1N6123 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6123 requirements.
6.How does Aetrix verify that 1N6123 is sourced from the original manufacturer or authorized distributors?
All 1N6123 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 1N6123 meets industry standards.
7.What is the process for return or replacement of 1N6123?
All 1N6123 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6123, 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 1N6123 part is unused and in its original packaging.
Return procedure for 1N6123:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6123 Tags
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