VLR170F datasheet(17/18 Pages) MACOM

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• Operation beyond maximum ratings or improper

use may result in device damage and possible

electrical arcing and flame.

• These devices are intended for protection

against occasional overcurrent or overtemper-

ature fault conditions, and should not be used

when repeated fault conditions are anticipated.

• TR and TS devices are not intended for contin-

uous utility line voltage such as 120/220V or

240V.

• LVR Product Notes:

1. A PTC device is not a fuse—it is a nonlinear

thermistor that limits current. Because under a

fault condition all PTC devices go into a high

resistance state but not open circuit, hazardous

voltage may be present at PTC locations.

2. The devices are intended for protection

against occasional overcurrent or

overtemperature fault conditions and should not

be used when repeated fault conditions or

prolonged trip events are anticipated.

3. Please refer to the SCD for complete

information and applications limitations, which

can be obtained from product management

(650-361-6900) or the web:

www.circuitprotection.com/lvr/

WARNING!

Agency approvals for PolySwitch devices:

PolySwitch devices, where appropriate,

have been tested and have gained the

following safety agency approvals:

• UL Component Recognition in Category

XGPU2, Thermistor Type Devices

• CSA Component Acceptance Class

9073 32, Thermistors—PTC Type

•TU

¨ V Rheinland Certification, PTC

Resistors

Voltage Rating for Telecom Devices

For Raychem Circuit Protection telecom

devices (TC, TGC, TRx, TSx) there are

two applicable voltage ratings. These are

Vmax. Operating and Vmax. Interrupt. To

help understand the nature of these two

different voltage ratings the following

definitions are provided:

Vmax. Interrupt: Under specified

conditions this is the highest voltage

that can be applied to the device at the

maximum current. Devices have been

designed to trip safely under higher power

level cross conditions, as listed above, to

assist equipment in meeting the

appropriate industry conditions.

Vmax. Operating: For telecom devices

this is the voltage we have used to obtain

component recognition under UL1434.

Most Raychem Circuit Protection devices

(TC, TGC, TRx, TSx) are certified at 60V

but can withstand higher Vmax. TR600 and

TS600 product families are certified at

250V but can withstand higher Vmax.

Interrupt conditions as noted above.

For the purposes of this brochure we have

included in the table of electrical ratings

the more applicable Vmax. Interrupt value.

Definitions

IH = Hold current—maximum current at which the

device will not trip under specified conditions at

20°C unless otherwise specified.

Imax. = The highest fault current that can safely

be used to trip a PolySwitch device under

specified conditions.

Vmax. = The highest voltage that can safely be

dropped across a PolySwitch device

continuously in its tripped state under specified

fault conditions.

R1max. = Maximum device resistance under

specified conditions measured 1 hour post trip or

post reflow.

Ramax. = Maximum device resistance under

automotive conditions specified in PS400

measured 1 hour after stress has been removed.

Rmax. Initial = Maximum device resistance

under specified conditions as supplied.

IT = Minimum current at which a device will trip

under specified conditions.

Standard PolySwitch product families

include, RGEF, RHEF, RTEF, RUEF, RXEF,

LVR, SMDF, nanoSMDF, microSMDF,

miniSMDF, BBRF, LR4F, LTPF, SRPF,

VTPF, VLRF, VLPF, AHRF, AGRF, and

AHS. PolySwitch TS, TR and ASMD

product families offer a selected number of

RoHS compliant parts. In addition, special

devices, such as speaker devices (SPK),

terminal devices (TD) and custom chip

devices, can be manufactured to meet

performance requirements that could be

outside of the performance band of the

standard products listed in this short form

catalog. Please contact a Raychem Circuit

Protection Customer Service representative

to discuss your special product needs.

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