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LoRho SMD PPTC for Charging Cable ProtectionNew Product IntroductionApril 2017

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LoRho SMD PPTC for Charging Cable ProtectionProduct Brief§ Protects connectors from

over-heating§ Place on Vbus line§ Sense over-heating and

prevent charging until contamination is removed

§ For charging cables & connectors such as:– USB-C– microUSB

§ Causes of heat include:– Dust, – Dirt, or – Water

§ Maximum electrical rating: – 12Vdc– Up to 4.5A

§ 1206/1210 sizes save board space in USB connector

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Features and Benefits

Features BenefitsSMD compatible with reflow soldering process

Reduce assembly time and cost compared to other form factors

Available in small 1206and 1210 sizes

Save PCB space at USB-C connector and ensure USB-C plug meets USB-IF dimension specifications

Up to 12Vdc and4.5A Ihold

Available for fast charging

Ultra low internalresistance Less power loss and more efficient charging

Automatically reset No replacement needed after fault removed

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Thermal Events of Smart Phone During ChargingAs charging current increases, the incidents of thermal runaway are happening more frequently at charging port side.

Finding an economical protection solution to such events is important at initial design stage

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Root Cause Analyze of USB Connector Damage

Vbus

GND

Charging cable & microUSB connector

Mobile phone female microUSB connectorA

DamageExperienced

Possible Failure Locations Cause

Connector Damaged due to significant heat

(I2R)

Contact FailureContactor contamination,deformation, wearing, rust, etc

Between Vbus and GND

Small external items entering connector; metal particles, hair, fur, liquid, etc.

B

A

A

B

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Over-temperature Protection Using PTCR: Contact resistance increased due to contamination/deformation at contact pinsi: Charging current increased to 3A/5A for USB Type-Ci2R: Heat generated from contact pins

PTC inside USB plug

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Comparison

Part Number V_max(V)

I_hold20°C (A)

I_hold60°C (A)

R1_max(Ω) Footprint

nanoSMD350LR 6 3.5 1.9 0.018 1206

microSMD450LR 5 4.5 3.2 0.008 1210

nanoSMD500LR 6 5.0 3.7 0.008 1206

nanoSMD350LR-C 12 3.5 1.9 0.018 1206

nanoSMD400LR-C 12 4.0 2.8 0.010 1206

microSMD450LR-C 12 4.5 3.3 0.0085 1210

NEW!

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Applications and Markets

§ ApplicationsCharging cables and connectors with small pin pitch (pin-to-pin dimensions) such as microUSB and USB-C. This is especially important in fast charging applications which have higher voltages and currents.

§ Markets1. Smartphone2. Tablet PC3. Laptop PC4. TV and Set Top Box5. Camera, Video Game Console

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Electrical Specifications

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Dimensions

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Part Numbering System

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Pricing, Samples, Availability and ContactsPricing and Samples For pricing and samples availability, please contact Littelfuse product management and sales representatives.

Production Availability Production lead-time: 6-8 weeksPackaging: Tape & ReelMinimum pack quantity: 3,000 piecesMinimum order quantity: 15,000 pieces

Contacts Product Manager: Vincent Wu, email: VWu2@littelfuse.comAsst. Product Manager: Justin Xu, email: JXu7@littelfuse.comProduct Engineer: Ellen Li, email: ELi2@littelfuse.com

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Sales Tools and Contact Information§ Current datasheets are available on www.littelfuse.com§ Application and Technical Support: 1-800-999-9445