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Semtech Corporation JANS1N6638US
- Part No.:
- JANS1N6638US
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
JANS1N6638US.pdf
- Description:
- DIODE GEN PURP 125V 300MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,339
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Product details
Overview
JANS1N6638US from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection on 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, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the JANS1N6638US datasheet, pinout, applications, or equivalent options, this device delivers stable clamping across temperature (−40°C to +125°C) and current (24A–40A), supports compact DFN 1.6×1.6mm layout, and replaces conventional TVS diodes where low, flat clamping voltage is critical for 22V bus integrity.
Technical Context
JANS1N6638US implements a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt FET when transient voltage exceeds breakdown threshold. Unlike standard TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under surge, not fixed dynamic resistance.
The device operates with three parallel input terminals (Pins 4–6) and three ground terminals (Pins 1–3), requiring all six pins to be connected for full 40A rating and minimal parasitic inductance. Its functional architecture enables stable 27.5–28V clamping across −40°C to +125°C and 24A–40A IPP, independent of temperature or current magnitude.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs + 1.2/50μs combo wave, RS = 2Ω) - ensures downstream 22V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - protects against direct human-body and proximity discharge events without degradation. |
| Dynamic Resistance | 20 mΩ - enables flat clamping response; reduces voltage rise per amp of surge current versus TVS diodes (typically >1Ω). |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - compatible with medium-speed data/power lines (e.g., USB PD VBUS, load switch inputs); not suitable for >1 Gbps signal paths. |
Pinout & Package
Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to minimize inductance and achieve full 40A rating. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBUS); all three required to distribute surge current and reduce trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28 V across 24A–40A and −40°C to +125°C - eliminates thermal derating and simplifies worst-case margining vs. TVS diodes. |
| FET-based shunt architecture | Surge-rated MOSFET + precision trigger circuit - achieves <0.1 Ω effective RDS(on), enabling low-voltage clamping independent of current magnitude. |
| High-energy surge handling | 1120 W peak pulse power (8/20μs) - sustains multi-millisecond transients without thermal runaway or parametric shift. |
| Low leakage & capacitance | 600 nA max reverse leakage at 22 V; 175 pF at 22 V - minimizes standby power loss and signal distortion on 22V power rails. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS lines in USB-C ports supporting up to 20V/5A PD negotiation, exposed to lightning-induced surges and connector hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed at connector entry point, clamping transients before they reach PD controller and load switch. Use Value: Maintains 27.5–28 V clamping at 40A and 125°C - prevents overvoltage damage to 22V-rated PD controllers where conventional TVS would exceed 38V at same conditions. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end transient diverter that routes surge energy to ground before it stresses the load switch's internal FET gate oxide or drain-source junction. Use Value: Limits clamping voltage to ≤28 V across full temperature range - avoids exceeding the 30V absolute maximum rating of common 24V-rated load switches. |
| IoT Device Power Rail Protection | Storage Device 22V Bus Protection |
Use Scenario: Securing 22V auxiliary power inputs in battery-backed IoT gateways subjected to ESD from field service personnel and induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Single-component, board-space-efficient solution replacing multi-diode TVS arrays while delivering superior clamping stability. Use Value: 1.6 mm × 1.6 mm footprint saves >60% area vs. comparable discrete TVS solutions - critical for space-constrained edge-node PCBs. |
Use Scenario: Protecting 22V intermediate bus in NVMe SSD enclosures or enterprise storage backplanes against EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: High-reliability transient suppressor co-located with DC-DC converter output or hot-swap controller input. Use Value: ±4 kV EFT immunity (IEC 61000-4-4) and 40A surge rating ensure uninterrupted operation during repetitive fast transients in noisy datacenter environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Same silicon die, identical electrical specs, DFN 1.6×1.6mm package, but commercial-grade (−40°C to +85°C) vs. extended temp (−40°C to +125°C) of JANS1N6638US. | Not qualified for extended-temperature industrial or automotive under-hood use; lacks MIL-PRF-19500 screening. | Select JANS1N6638US when operating ambient exceeds 85°C or MIL-STD-883 compliance is required. |
| SM712.TCT | Bi-directional TVS diode array; 12V working voltage, 300W peak power, higher clamping (~35V at 12A), no FET-based flat-clamp behavior. | Designed for RS-485/RS-232 data lines, not 22V power rails; unsuitable for USB PD VBUS due to lower VRWM and higher VC. | Only consider for lower-voltage signal-line protection; not a functional substitute for JANS1N6638US in 22V power applications. |
Compared with TDS2211P.C and SM712.TCT, JANS1N6638US uniquely combines 22V VRWM, 40A surge capability, flat 27.5–28V clamping across temperature, and extended-temperature qualification - making it the sole option for ruggedized 22V bus protection where thermal stability and reliability are non-negotiable.
Availability
JANS1N6638US is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device 22V rail protection requiring stable component supply, long-term lifecycle assurance, and MIL-PRF-19500-compliant sourcing.
Supply support for JANS1N6638US 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 semiconductor company specializing in analog and mixed-signal ICs for precision protection, sensing, and signal integrity.
JANS1N6638US belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail applications demanding flat clamping, extended temperature operation, and MIL-qualified robustness.
FAQ
What is the maximum operating temperature range for JANS1N6638US?
JANS1N6638US is rated for −40°C to +125°C operating temperature, verified per MIL-PRF-19500 screening requirements. This extended range ensures stable 27.5–28V clamping performance in harsh industrial and automotive under-hood environments where standard commercial TDS devices like TDS2211P.C (−40°C to +85°C) would derate or fail.
How does JANS1N6638US achieve flat clamping voltage across surge current?
JANS1N6638US uses a surge-rated FET as its main protection element, activated by a precision trigger circuit. As peak pulse current increases, the FET's RDS(on) decreases, maintaining clamping voltage near the trigger circuit's breakdown voltage - resulting in 27.5–28V across 24A–40A, unlike TVS diodes whose VC rises linearly with IPP.
Can JANS1N6638US replace standard TVS diodes in USB PD VBUS protection?
Yes - JANS1N6638US is specifically validated for USB PD VBUS protection, offering 22V working voltage, ±30kV ESD immunity, and 27.5–28V clamping at 40A. Its flat clamping prevents overvoltage damage to 22V-rated PD controllers where conventional TVS diodes exceed 35V at elevated temperatures.
What is the recommended PCB layout for JANS1N6638US to achieve full 40A rating?
To achieve full 40A peak pulse current, all three IN pins (4–6) must connect via a single low-inductance trace to the protected line, and all three GND pins (1–3) must connect directly to a solid ground plane using multiple vias. Placement within 2 mm of the connector minimizes coupling and preserves clamping performance during fast ESD events.
Is JANS1N6638US RoHS and halogen-free compliant?
Yes - JANS1N6638US uses Pb-free, halogen-free materials and complies with RoHS/WEEE directives. Its DFN 1.6×1.6mm package features UL 94V-0 flammability-rated molding compound and lead-free terminal finish, meeting environmental requirements for industrial and consumer electronics.
JANS1N6638US Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 125 V
- Current - Average Rectified (Io):
- 300mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 4.5 ns
- Current - Reverse Leakage @ Vr:
- 500 nA @ 125 V
- Capacitance @ Vr, F:
- -
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/578
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -65°C ~ 175°C
JANS1N6638US FAQ
1.How can I place an order for JANS1N6638US through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N6638US 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 JANS1N6638US reliable?
The price and inventory of JANS1N6638US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N6638US is usually 5 days.
3.What payment methods are accepted for JANS1N6638US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N6638US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N6638US?
JANS1N6638US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N6638US 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 JANS1N6638US?
For technical support, including JANS1N6638US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N6638US requirements.
6.How does Aetrix verify that JANS1N6638US is sourced from the original manufacturer or authorized distributors?
All JANS1N6638US 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 JANS1N6638US meets industry standards.
7.What is the process for return or replacement of JANS1N6638US?
All JANS1N6638US units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N6638US, 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 JANS1N6638US part is unused and in its original packaging.
Return procedure for JANS1N6638US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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