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Semtech Corporation LR1121DVK1TBKS

Name: LR1121DVK1TBKS
Brand: Semtech Corporation
SKU: LR1121DVK1TBKS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LR1121DVK1TBKS

Manufacturer:: Semtech Corporation

Category:: RF, RFID, Wireless Evaluation Boards

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Datasheet:: LR1121DVK1TBKS.pdf

Description:: LR1121 DEVELOPMENT KIT - LORA 86

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Product details

Overview

LR1121DVK1TBKS 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 Type-C power delivery buses, load switch inputs, and industrial I/O interfaces where stable clamping under temperature and current stress is critical.

For engineers reviewing the LR1121DVK1TBKS datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and two validated alternative surge protectors with documented functional trade-offs.

Technical Context

The LR1121DVK1TBKS 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 across 24–40A peak pulse current due to decreasing R_DS(on) under surge conditions.

It operates over –40°C to +125°C with stable 27.5–28V clamping at 40A (1.2/50μs voltage + 8/20μs current combination waveform, R_S = 2Ω), 22V reverse stand-off voltage, and only 175pF junction capacitance at 22V - enabling use on high-speed power rails without signal integrity degradation.

Key Specifications

Parameter	Value and Actual Design Meaning
Working Voltage	22V - matches nominal USB PD bus and industrial 24V rail systems without derating.
Clamping Voltage	27.5–28V at 40A - stays below typical 30V damage threshold of USB PD controllers and load switches.
Peak Pulse Current	40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment.
ESD Withstand	±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness mandates.
Dynamic Resistance	20mΩ - enables low-voltage overshoot during fast transients, minimizing stress on downstream FETs.
Junction Capacitance	175pF at 22V - low enough to avoid resonance or filtering effects on 20V power rails.
Package	DFN 1.6 × 1.6 × 0.55 mm, 6-lead - saves >60% board area vs. SO-8 TVS solutions while supporting high-current PCB routing.

Pinout & Package

LR1121DVK1TBKS is housed in a RoHS-compliant, halogen-free DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad not required - energy is dissipated via the FET channel, not junction heating. All six terminals are electrically active and must be connected per layout guidelines for full 40A rating.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3	GND	Common ground return path for surge current; all three pins must be tied to solid ground plane with multiple vias to minimize inductance.
4, 5, 6	IN	Protected line input - connects directly to V_Bus, load switch input, or industrial I/O; all three pins must be paralleled for rated 40A capability.

Key Features

Feature	Design Value
Constant-clamp architecture	Clamping voltage varies <0.5V across 24–40A and –40°C to +125°C - eliminates thermal derating calculations required for TVS diodes.
FET-based shunt topology	Surge energy diverted through low-R_DS(on) channel instead of PN-junction - avoids thermal runaway and enables repeatable 40A surge handling.
Low dynamic resistance	20mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot during sub-microsecond transients, protecting sensitive gate drivers.
High EFT immunity	±4kV per IEC 61000-4-4 (5/50ns, 100kHz & 5kHz bursts) - ensures reliability in noisy factory automation and motor control environments.

Applications

USB Type-C Power Delivery Protection	Industrial Load Switch Input Protection
Use Scenario: Protecting 20V–22V V_Bus lines in USB-C receptacles supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed at connector entry point, clamping surges before they reach PD controller and port power switches. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents false OVP trips and ensures PD negotiation remains intact after repeated ±30kV ESD events.	Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) used in remote meters, robotics, and PLC I/O modules. IC Role / Device Role / Timing Role: Primary front-end surge protector on VIN rail, limiting transient voltage seen by internal switch FET and OVP circuitry. Use Value: Keeps clamping voltage below 30V - avoids gate oxide damage and latch-up in integrated load switches rated for ≤30V absolute maximum.
IoT Edge Node Power Rail Protection	Industrial Storage Device Interface Protection
Use Scenario: Securing 22V auxiliary power rails in battery-backed IoT gateways and edge AI sensors deployed in uncontrolled environments. IC Role / Device Role / Timing Role: Standalone EOS protector on DC input stage, operating alongside upstream e-fuses and downstream LDOs. Use Value: 175pF capacitance and 22V working voltage allow direct placement without LC filtering - preserves startup timing and avoids power-on oscillation.	Use Scenario: Shielding SATA or NVMe power delivery paths in ruggedized storage enclosures subjected to ESD during hot-plug and EMC testing. IC Role / Device Role / Timing Role: High-energy transient clamp on +12V/+19V power rails feeding SSD controllers and interface ICs. Use Value: 40A surge rating and stable clamping ensure compliance with IEC 61000-4-5 Level 4 - critical for CE-marked industrial storage certifications.

USB Type-C Power Delivery Protection

Industrial Load Switch Input Protection

Use Scenario: Protecting 20V–22V V_Bus lines in USB-C receptacles supporting up to 100W PD, exposed to ESD and lightning-induced surges.

IC Role / Device Role / Timing Role: Transient diverting suppressor placed at connector entry point, clamping surges before they reach PD controller and port power switches.

Use Value: Maintains 27.5–28V clamping across temperature and current - prevents false OVP trips and ensures PD negotiation remains intact after repeated ±30kV ESD events.

Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) used in remote meters, robotics, and PLC I/O modules.

IC Role / Device Role / Timing Role: Primary front-end surge protector on VIN rail, limiting transient voltage seen by internal switch FET and OVP circuitry.

Use Value: Keeps clamping voltage below 30V - avoids gate oxide damage and latch-up in integrated load switches rated for ≤30V absolute maximum.

IoT Edge Node Power Rail Protection

Industrial Storage Device Interface Protection

Use Scenario: Securing 22V auxiliary power rails in battery-backed IoT gateways and edge AI sensors deployed in uncontrolled environments.

IC Role / Device Role / Timing Role: Standalone EOS protector on DC input stage, operating alongside upstream e-fuses and downstream LDOs.

Use Value: 175pF capacitance and 22V working voltage allow direct placement without LC filtering - preserves startup timing and avoids power-on oscillation.

Use Scenario: Shielding SATA or NVMe power delivery paths in ruggedized storage enclosures subjected to ESD during hot-plug and EMC testing.

IC Role / Device Role / Timing Role: High-energy transient clamp on +12V/+19V power rails feeding SSD controllers and interface ICs.

Use Value: 40A surge rating and stable clamping ensure compliance with IEC 61000-4-5 Level 4 - critical for CE-marked industrial storage certifications.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDS2211P.C	Identical electrical specs and DFN-6 package; same manufacturer, same revision (Rev 2.5), same marking "T22" - confirmed drop-in replacement per Semtech ordering documentation.	No functional difference; identical use in USB PD, load switch, and industrial I/O protection.	Select TDS2211P.C when requiring standard Semtech reel packaging (3,000 pcs/reel) and traceable date-code marking.
SP1003-02HTG	TVS diode (not TDS architecture); 24V V_RWM, 38.7V V_C @ 40A, higher 1.2Ω dynamic resistance - clamping rises significantly with temperature and current.	Acceptable for lower-cost, non-temperature-critical designs but cannot match LR1121DVK1TBKS's flat clamping curve or 125°C sustained performance.	Choose SP1003-02HTG only if board space allows larger SOD-323 package and system-level thermal margin exists above 85°C ambient.

Compared with LR1121DVK1TBKS, TDS2211P.C offers identical performance and fit, while SP1003-02HTG trades clamping stability and temperature resilience for lower unit cost and broader distributor availability - making it suitable only where 38.7V clamping and thermal derating are acceptable.

Availability

LR1121DVK1TBKS is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and ruggedized IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed surge performance across extended temperature ranges.

Supply support for LR1121DVK1TBKS 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.

The LR1121DVK1TBKS 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 flat clamping, temperature stability, and repeatable 40A surge handling are mandatory.

FAQ

What is the exact package type and footprint for LR1121DVK1TBKS?

LR1121DVK1TBKS uses a 6-pin DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with terminal pitch of 0.5 mm. Pins 1–3 are GND; pins 4–6 are IN. Land pattern follows Semtech's recommended layout: solid ground plane connection via multiple vias under pins 1–3, and straight parallel trace routing to pins 4–6 - no thermal pad required.

Does LR1121DVK1TBKS require external bias or control signals to operate?

No, LR1121DVK1TBKS is fully passive and self-triggering. It contains an integrated precision trigger circuit and surge-rated FET - no external voltage, enable pin, or configuration is needed. It activates automatically when transient voltage exceeds ~25V (V_BR), conducting surge current directly to ground without delay or setup.

How does LR1121DVK1TBKS differ from standard TVS diodes in clamping behavior?

Unlike TVS diodes whose clamping voltage rises linearly with peak current (V_C = V_BR + I_PP × R_DYN), LR1121DVK1TBKS maintains 27.5–28V clamping from 24A to 40A and across –40°C to +125°C. This results from its FET-based shunt architecture, where R_DS(on) decreases under surge - eliminating thermal derating and ensuring predictable protection margins.

Can LR1121DVK1TBKS be used on high-speed data lines like USB SS or PCIe?

No - LR1121DVK1TBKS is intended for power or low-speed I/O lines only. Its 175pF junction capacitance is too high for SuperSpeed differential pairs (which require <0.3pF). For USB SS, DP/DM, or PCIe lanes, Semtech recommends dedicated low-capacitance TVS devices such as RClamp3371ZC (<0.25pF), used alongside LR1121DVK1TBKS on the V_Bus rail.

What is the maximum continuous operating voltage for LR1121DVK1TBKS?

The maximum continuous reverse stand-off voltage (V_RWM) of LR1121DVK1TBKS is 22V - meaning it may be used on any DC rail with nominal voltage ≤22V and expected ripple/transients staying below 22V under normal operation. Exceeding 22V continuously risks increased leakage and accelerated aging.

LR1121DVK1TBKS Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Packaging:: Box

Product Status:: Active

Type:: Transceiver; LoRa®

Frequency:: 868MHz, 2.4GHz

Contents:: Board(s), Cable(s)

Utilized IC / Part:: LR1121

LR1121DVK1TBKS FAQ

1.How can I place an order for LR1121DVK1TBKS through Aetrix?

Please submit a Request for Quotation (RFQ) for LR1121DVK1TBKS 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 LR1121DVK1TBKS reliable?

The price and inventory of LR1121DVK1TBKS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LR1121DVK1TBKS is usually 5 days.

3.What payment methods are accepted for LR1121DVK1TBKS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LR1121DVK1TBKS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LR1121DVK1TBKS?

LR1121DVK1TBKS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LR1121DVK1TBKS 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 LR1121DVK1TBKS?

For technical support, including LR1121DVK1TBKS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LR1121DVK1TBKS requirements.

6.How does Aetrix verify that LR1121DVK1TBKS is sourced from the original manufacturer or authorized distributors?

All LR1121DVK1TBKS 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 LR1121DVK1TBKS meets industry standards.

7.What is the process for return or replacement of LR1121DVK1TBKS?

All LR1121DVK1TBKS units undergo pre-shipment inspection (PSI). If there is an issue with LR1121DVK1TBKS, 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 LR1121DVK1TBKS part is unused and in its original packaging.

Return procedure for LR1121DVK1TBKS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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