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Radial-leaded

PolySwitch Radial-leaded

Resettable Devices

Raychem Circuit Protection has

pioneered PPTC technology for

over twenty years. Our radial-

leaded products represent the

widest range of product capabilities.

• RGE series for hold currents up

to 14A

• RHE series for flatter thermal

derating and operating tempera-

tures up to 125°C

• RUE series for balance of volt-

age rating (30V) and hold current

(up to 9A)

• RUSB series for fast time-to-trip

and low-resistance computer

applications

• RTE series specifically designed

for IEEE-1394 applications

• RXE series for low hold currents

(down to 50mA) and high volt-

age rating (up to 72V)

• TR600 series for North America

telephone applications

• TR250 series for ITU telephone

applications

• BBR series for cable telephone

applications

Whether for design or volume

application, our radial-leaded

products represent the most

comprehensive and complete set

of PPTC products available in

the industry today.

Features:

• Broadest range of radial-leaded

resettable devices available in

the industry

• Current ratings from 50mA to

14A

• Voltage ratings from 6V (computer

and electronic applications) to 90V

(cable and telecommunication

equipment)

• Agency recognition: UL, CSA,

TÜV

• Fast time-to-trip

• Low resistance

Applications:

• Satellite video receivers

• Industrial controls

• Transformers

• Computer motherboards

• Modems

• USB hub, ports and peripherals

• IEEE1394 ports

• CD-ROMs

• Game machines

• Battery packs

• Phones

• Fax machines

• Analog and digital line cards

• Printers

Benefits:

• Many product choices give

engineers more design flexibility

• Compatible with high-volume

electronics assembly

• Assists in meeting regulatory

requirements

• Higher voltage ratings allow use

in new applications

Devices in this section are grouped by:

Voltage Rating, Device Series, Hold Current

Raychem Circuit Protection Devices

PolySwitch Radial-leaded Resettable Devices

205

Selection Guide for Radial-leaded Devices

Step 1.

Determine the circuit’s operating parameters.

Fill in the following information about the circuit:

Maximum ambient operating temperature

Normal operating current

Maximum operating voltage

(i.e., RUE135 is 30V max.)

Maximum interrupt current

Step 2.

Select the PolySwitch device that will accommodate the

circuit’s maximum ambient temperature and normal operating

current.

Look across the top of Table R2 to find the temperature that most

closely matches the circuit’s maximum operating temperature. Look

down that column to find the value equal to or greater than the circuit’s

normal operating current. Now look to the far left of that row to find the

part number for the PolySwitch device that will best accommodate the

circuit. Devices in this section are grouped by voltage rating; therefore,

your operating current requirement may be found in more than one

product grouping.

The thermal derating curves located in Figures R1–R4 are the normal-

ized representations of the data in Table R2.

Step 3.

Compare the maximum electrical ratings of the selected

device with the maximum operating voltage and maximum inter-

rupt currents of the circuit.

Look down the first column of Table R3 to find the part number you

selected in Step 2. Look to the right in that row to find the device’s

maximum operating voltage (V

MAX

) and maximum interrupt current

MAX

). Ensure that V

MAX

and I

MAX

are greater than or equal to operating

voltage and maximum interrupt current.

206

PolySwitch Radial-leaded Resettable Devices

Raychem Circuit Protection Devices

Radial-leaded

Step 4.

Determine time-to-trip.

Time-to-trip is the amount of time it takes for a device to switch

to a high-resistance state once a fault current has been applied

across the device. Identifying the PolySwitch device’s time-to-

trip is important in order to provide the desired protection

capabilities. If the device you choose trips too fast, undesired

or nuisance tripping will occur. If the device trips too slowly, the

components being protected may be damaged before the

device switches to a high-resistance state.

Refer to the typical time-to-trip curves for each of the

PolySwitch devices found in Figures R16–R21.

If the time-to-trip of the PolySwitch device is too fast or too slow

for the circuit, go back to Step 2 and choose an alternate

device.

Step 5.

Verify ambient operating conditions.

Ensure that your application’s minimum and maximum ambient

temperatures are within the operating temperature of -40°C to

85°C (-40 to 125°C for RHE device series).

Step 6.

Verify the PolySwitch device dimensions.

Using the dimensions in Table R4, compare the dimensions of

the PolySwitch device you selected with the application’s space

considerations.

Raychem Circuit Protection Devices

PolySwitch Radial-leaded Resettable Devices

207

Protection Application Selection Guide for Radial-leaded Devices

The guide below lists PolySwitch

devices that are typically used in

these applications.

Specifications for the suggested

device part numbers can be

found in this section.

Once a part number has been

selected, the user should evalu-

ate and test each product for its

intended application.

Protection Application

Electromagnetic loads

Halogen lighting

Lighting ballast

Loudspeakers

Medical equipment

MOSFET devices

Motors, fans, and blowers

POS equipment

Process and industrial controls

Satellite video receivers

Security and fire alarm systems

Test and measurement equipment

Transformers

UL1950/FCC Part 68 requirements

DDC computer video ports

PolySwitch Resettable Devices—Key Selection Criteria

Flatter

Lower Current

Small Size

Derating

Higher Voltage

RGE (<16V), RUE (<30V)

RXE, BBR

RXE

RGE (<16V), RUE (<30V)

RXE (<72V), RGE (<16V)

RXE, RUE

RGE (<16V), RUE (<30V)

RXE

RUE

RTE

RUE

RUSB

RGE (<16V), RUE (<30V)

RHE (<16V)

RXE

RHE (<16V)

RXE

RHE (<16V)

RXE

RHE (<16V)

RXE

IEEE-1394 computer and consumer electronics

Mouse and keyboard

SCSI

USB

Traces and printed circuit board protection

This list is not exhaustive. Raychem Circuit Protection welcomes customer's input for additional application ideas for PolySwitch resettable devices.

208

PolySwitch Radial-leaded Resettable Devices

Raychem Circuit Protection Devices

Radial-leaded

Table R1. Product Series – Current Rating, Voltage Rating/Typical Resistance for Radial-leaded Devices

Voltage Rating

Hold Current (A)

0.050

0.080

0.100

0.110

0.120

0.145

0.150

0.160

0.170

0.180

0.200

0.250

0.300

0.400

0.500

0.550

0.650

0.700

0.750

0.900

1.10

1.20

1.35

1.55

1.60

1.85

1.90

2.50

3.00

3.75

4.00

4.50

5.00

6.00

6.50

7.00

7.50

8.00

9.00

10.0

11.0

12.0

13.0

BBR

90V

—

0.67Ω

—

0.56Ω

—

TR600

60/600V*

—

9.0Ω

7.0Ω

—

TR250

60/250V*

—

17.0Ω

—

6.0Ω

4.5Ω

—

1.4Ω

—

RXE

72V

—

2.29Ω

1.60Ω

1.11Ω

0.71Ω

0.64Ω

—

0.40Ω

—

0.325Ω

0.255Ω

0.200Ω

—

0.155Ω

—

0.115Ω

0.100Ω

—

0.065Ω

0.050Ω

0.040Ω

—

RXE

60V

9.2Ω

10.0Ω

—

3.50Ω

—

4.30Ω

—

RTE

33V

—

0.097Ω

0.080Ω

—

0.054Ω

—

RUE

30V

—

0.095Ω

0.075Ω

—

0.060Ω

—

0.050Ω

0.045Ω

—

0.030Ω

0.035Ω

—

0.020Ω

—

0.020Ω

0.013Ω

—

0.013Ω

—

0.013Ω

0.008Ω

—

RGE

16V

—

0.0514Ω

—

0.030Ω

—

0.0192Ω

0.0145Ω

—

0.0105Ω

—

0.0086Ω

0.0070Ω

0.0056Ω

0.0050Ω

0.0046Ω

—

0.0040Ω

RHE

16V

—

0.42Ω

—

0.029Ω

—

0.0175Ω

0.0144Ω

—

0.0173Ω

—

0.0083Ω

—

0.0055Ω

—

RUSB

16V

—

0.10Ω

0.075Ω

—

0.060Ω

—

0.050Ω

0.045Ω

—

0.030Ω

—

RUSB

—

0.14Ω

—

0.080Ω

—

0.058Ω

—

14.0

—

Refer to Telecommunications and Networking section for specific voltage rating information.

Raychem Circuit Protection Devices

PolySwitch Radial-leaded Resettable Devices

209