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Semtech Corporation 1N6138
- Part No.:
- 1N6138
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- Axial
- Datasheet:
-
1N6138.pdf
- Description:
- TVS DIODE 5.2VWM 11VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,630
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Product details
Overview
1N6138 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 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the 1N6138 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, clamping stability across temperature, and direct alternatives for 22V bus protection with low-voltage overshoot control.
Technical Context
The 1N6138 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-from 24A to 40A and across –40°C to +125°C due to decreasing RDS(on) under surge.
It operates with reverse stand-off voltage (VRWM) of 22V, breakdown voltage (VBR) of 25–27.9V at 1mA, and ultra-low junction capacitance of 175pF at 22V/1MHz-enabling use on high-speed power rails without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V reverse stand-off (VRWM): defines maximum continuous DC operating voltage before activation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave): ensures protected ICs see <28V during worst-case surges. |
| Peak Pulse Current | 40A (8/20μs): supports compliance with IEC 61000-4-5 ±1kV (RS = 42Ω) industrial surge testing. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2): exceeds Level 4 requirements for rugged handheld and industrial interfaces. |
| Dynamic Resistance | 20mΩ (8/20μs): enables flat clamping curve and minimizes voltage rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V/1MHz: low enough for 22V power rail protection without degrading transient response or coupling noise. |
Pinout & Package
1N6138 is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required-energy is dissipated in the FET channel, not the junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three pins must be connected to maximize current handling and minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus); all three pins are internally paralleled and must be shorted externally for full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage stays within 27.5–28V from 24A to 40A-unlike TVS diodes whose VC rises linearly with IPP. |
| Temperature-stable protection | Clamping remains stable from –40°C to +125°C; no derating needed for hot industrial environments. |
| Low dynamic resistance | 20mΩ enables minimal IR drop during surge, preserving voltage margin for downstream 22V-rated ICs. |
| High-energy EOS handling | 1120W peak pulse power (8/20μs) supports robust protection against lightning-induced surges and load dump transients. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the 20V–22V VBus line in USB Type-C ports supporting Power Delivery up to 100W. IC Role / Device Role / Timing Role: Primary overvoltage shunt suppressor placed between VBus and GND, activated within nanoseconds of EOS onset. Use Value: Maintains clamping at ≤28V across temperature and current-preventing damage to USB PD controllers rated for 30V absolute max. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of the load switch during 40A surges, enabling reliable hot-swap and fault-tolerant operation. |
| Storage Device Power Rail Protection | Notebook/Tablet Main Power Input Protection |
Use Scenario: Securing 19V–22V input rails in NVMe SSD enclosures and external HDD docks exposed to ESD during cable insertion. IC Role / Device Role / Timing Role: Low-capacitance (175pF), fast-acting suppressor placed directly at the connector to intercept transients before reaching PMICs or regulators. Use Value: Delivers ±30kV ESD immunity without adding signal distortion or power rail instability-critical for high-reliability storage subsystems. |
Use Scenario: Protecting the main system power input (e.g., barrel jack or USB-C port) in thin-and-light notebooks and tablets operating at 20V nominal. IC Role / Device Role / Timing Role: High-power transient diverter that handles both lightning-induced surges and user-handling ESD events on shared power/data ports. Use Value: Enables compact, single-device protection with no thermal pad or heatsink-reducing BOM count and PCB area vs. multi-stage TVS solutions. |
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 device; 1N6138 is Semtech's alternate orderable part number for TDS2211P per official ordering documentation. | Identical functional and mechanical specification; used interchangeably in BOMs and layouts. | Select 1N6138 when sourcing through distributors listing this variant; verify reel packaging (3,000 pcs/7″ reel) matches production needs. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A (8/20μs), higher clamping, no constant-clamp architecture. | Higher clamping voltage limits use in 30V-tolerant systems only; unsuitable where <28V clamping is mandatory. | Choose SMAJ22A only if cost sensitivity outweighs clamping performance; requires thermal design for junction heating at high IPP. |
Compared with SMAJ22A, 1N6138 delivers 7–8V lower clamping at full 40A surge while maintaining stability over temperature-making it essential for protecting 22V-systems with tight voltage margins, whereas SMAJ22A suits less demanding legacy designs where board space and thermal management allow.
Availability
1N6138 is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and notebook/tablet power rail protection requiring stable component supply, consistent lead times, and full traceability.
Supply support for 1N6138 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 1N6138 belongs to Semtech's Transient Diverting Suppressor (TDS) product line-engineered specifically to replace conventional TVS diodes in 12–36V power rail protection with superior clamping consistency and temperature resilience.
FAQ
What is the exact relationship between 1N6138 and TDS2211P?
The 1N6138 is Semtech's alternate orderable part number for the TDS2211P device. Both share identical electrical specifications, pinout, package (DFN-6, 1.6×1.6mm), marking code (T22), and tape-and-reel packaging (3,000 pcs/7″ reel). They are functionally and mechanically interchangeable per Semtech's official ordering information.
Does 1N6138 require a thermal pad or heatsink on the PCB?
No. The 1N6138 uses a surge-rated FET architecture where energy is dissipated in the channel-not the silicon junction-so no thermal pad or heatsink is needed. Its DFN-6 package relies on low-inductance GND connections (pins 1–3) and short IN traces (pins 4–6) for optimal surge handling, per Semtech's layout guidelines.
Can 1N6138 protect high-speed data lines like USB SS or PCIe?
No. While 1N6138 has low junction capacitance (175pF), it is designed exclusively for power or low-speed I/O line protection (e.g., VBus, CC, SBU, load switch inputs). For SuperSpeed USB or PCIe data lanes, Semtech recommends dedicated low-capacitance TVS devices such as RClamp3371ZC (<0.25pF) instead of 1N6138.
What is the maximum operating temperature range for 1N6138?
The 1N6138 is rated for continuous operation from –40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range-27.5–28V at 40A-with no derating required-making it suitable for under-hood automotive modules, industrial PLCs, and thermally constrained portable devices.
How does 1N6138 compare to standard TVS diodes in surge response time?
The 1N6138 activates in <1ns-comparable to high-speed TVS diodes-due to its integrated precision trigger circuit. However, its key advantage is not speed but clamping behavior: unlike TVS diodes whose VC rises linearly with current (VC = VBR + IPP × RDYN), 1N6138 maintains near-constant VC (27.5–28V) from 24A to 40A thanks to its FET-based shunt architecture.
1N6138 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):
- 5.2V (Max)
- Voltage - Breakdown (Min):
- 6.12V
- Voltage - Clamping (Max) @ Ipp:
- 11V
- Current - Peak Pulse (10/1000µs):
- 142.8A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N6138 FAQ
1.How can I place an order for 1N6138 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6138 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 1N6138 reliable?
The price and inventory of 1N6138 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6138 is usually 5 days.
3.What payment methods are accepted for 1N6138?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6138 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6138?
1N6138 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6138 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 1N6138?
For technical support, including 1N6138 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6138 requirements.
6.How does Aetrix verify that 1N6138 is sourced from the original manufacturer or authorized distributors?
All 1N6138 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 1N6138 meets industry standards.
7.What is the process for return or replacement of 1N6138?
All 1N6138 units undergo pre-shipment inspection (PSI). If there is an issue with 1N6138, 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 1N6138 part is unused and in its original packaging.
Return procedure for 1N6138:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6138 Tags
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