Precision Thick Film

Surface Mounted Resistors

PCR Series

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Issue D · 08.04

Welwyn Components

34

Maximum

Typical

Load at rated power: 1000 hours at 70°C

∆R%

10 - 25k: 0.10

10 - 25k: 0.05

>25k - 1M: 0.4

>25k - 1M: 0.2

Load at rated power: 8000 hours at 70°C

∆R%

10 - 25k: 0.20

10 - 25k: 0.10

>25k - 1M: 0.80

>25k - 1M: 0.4

Load at 50% rated power: 1000 hours at 70°C

∆R%

10 - 1M: 0.10

10 - 1M: 0.03

Load at 50% rated power: 8000 hours at 70°C

∆R%

10 - 1M: 0.20

10 - 1M: 0.06

Shelf life: 12 months at room temperature

∆R%

0.05

0.01

Derating from rated power at 70°C

Zero at 155°C

Overload

∆R%

0.04

Dry heat: 1000 hours at 155°C

∆R%

0.1

0.04

Long term damp heat

∆R%

0.1

0.04

Temperature rapid change

∆R%

0.03

0.01

Resistance to solder heat

∆R%

0.10

0.02

Voltage proof

volts

500

Operating Temperature Range

The chips can operate at a maximum temperature of 155°C

(see Performance Data). For soldered chips, the joint

temperature should not exceed 110°C. This condition is met

when the stated power levels at 70°C are used.

Mounting

This chip resistor is ideally suited for handling by automatic

methods due to its rectangular shape and the small

dimensional tolerances. Electrical connection to a ceramic

substrate or to a printed circuit board can be made by wire

bonding (eg suffix ‘G’ in PCR0805G) or by reflow soldering of

wrap-around terminations (eg suffix ‘F’ in PCR0805F). The ‘F’

terminations provide good leach properties and ensure

reliable contact. Due to the robust construction the resistor

chip can be immersed in the solder bath for 30 seconds at

260°C. This enables the resistor to be mounted on one side

of a printed circuit and other wire-leaded components on the

other side.

Performance Data

Size/Tol.%

1

0.5

0.25

0.1

PCR0805

10 to 1M

10 to 1M

100 to 1M

100 to 1M

PCR1005

10 to 1M

10 to 1M

100 to 1M

100 to 1M

PCR1206

10 to 1M

10 to 1M

100 to 1M

100 to 1M

Value Ranges

Application Notes

Packaging

Resistor chips are supplied taped and reeled on standard 8mm

tape to IEC 286-3.

Quantity per reel 3000 max.

Planar Terminations

Resistor chips are supplied in waffle packs.

Type

1206

1M0

B

Resistance value

(IEC62 code)

Tolerance

(IEC62 code)

B

0.1%

C

0.25%

D

0.5%

Specify type reference, value and tolerance as shown in

this example of PCR1206 1M0 0.1%:

Ordering Procedure

PCR_D.qxd

8/9/04

3:54 PM

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