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Resistors

Pulse Withstanding

Chip

Withstanding

Pulse

Resistors

Chip Resistors

PWC Series

Welwyn Components

Excellent

PWC Series

pulse withstand performance

Improved working voltage

Excellent pulse withstand performance

Improved power

voltage

Improved working

rating

Standard chip sizes (0805 to 2512)

Improved power rating

Custom

designs available

Custom

designs available

Anti-sulphur version available

All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)

Electrical Data

Size

Power @70°C

Resistance range

Tolerance

LEV

TCR

Operating temperature

Thermal Impedance

Pad / trace area *

Values

Pulse Capability

ohms

ppm/°C

°C

°C/W

302

220

160

150

PWC0603

0.125

PWC0805

0.25

PWC1206

0.33

0.5

1R0 to 10M

10R to 1M: 0.5, All values: 1, 5

200

-55 to +155

145

125

250

100

500

400

<10R:200

≥10R:100

500

PWC2010

0.75

PWC2512

1.5

E96 preferred - other values to special order

See graphs – full application note available on request

*Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB

Physical Data

Dimensions of PWC resistors are given below in mm and weight in g

0603

0805

1206

2010

2512

1.5±0.1

2.0±0.3

3.2±0.4

5.1±0.3

6.5±0.3

0.8±0.1

1.25±0.2

1.6±0.2

2.5±0.2

3.2±0.2

T max

0.55

0.6

0.7

0.8

0.3±0.15

0.4±0.2

0.6±0.3

0.6 min

0.9 min

1.7 min

3.0 min

4.4 min

0.3±0.15

0.3±0.1

0.4±0.15

0.6±0.25

Wt.

0.002

0.009

0.020

0.036

0.055

Wrap-around terminations

(3 faces)

Construction

Thick film resistor material, overglaze and organic protection

are screen printed on a 96% alumina substrate. Wrap-around

terminations have an electroplated nickel barrier and solder

coating, this ensures excellent ‘leach’ resistance properties

and solderability.

Note that anti-sulphur version parts below 100R are

produced in flip-chip format with the resistor element on

the underside.

Marking

Components are not marked. Reels are marked with type,

value, tolerance, date code and quantity.

Solvent Resistance

The body protection is resistant to all normal industrial

cleaning solvents suitable for printed circuits.

General Note

Welwyn Components reserves the right to make changes in product specification

or liability.

TT Electronics reserves the right to make changes in product specification without notice

without notice or liability.

All information is subject to Welwyn’s own data and is considered accurate at time of going to print.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

BI Technologies IRC Welwyn

A subsidiary of

TT electronics plc

http://www.ttelectronics.com/resistors

07. 08

11.16

· Bedlington, Northumberland NE22 7AA, UK

822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Telephone: +44 (0) 1670

Pulse Withstanding

Chip Resistors

PWC Series

Welwyn Components

Performance Data

Size

Load at rated power: 1000 hours at 70°C

Shelf life test: 12 months at room temperature

Derating from rated power at 70°C

Overload: 6.25 x rated power for 2 seconds

Dry heat: 1000 hours at 155°C

Long term damp heat

Temperature rapid change

Resistance to solder heat

Resistance to sulphur-bearing gas (AS version only): ASTM-B-809

Voltage proof

Volts

Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms.

ΔR%

0.25

500

ΔR%

Maximum

0.1

Zero at 155°C

0.1

0.2

0.25

0.05

Typical

0.25

0.02

Pulse Performance Data

Lightning Surge

lightning surge resistors are tested in accordance with IEC 60 115-1 using both 1.2/50µs and 10/700µs pulse shapes. 10 pulses are applied. The limit of

acceptance is a shift in resistance of less than 1% from the initial value.

2512

2010

1206

0805

0603

Lightning Surge

lightning surge resistors are tested in

accordance with IEC 60 115-1 using

both 1.2/50µs and 10/700µs pulse shapes.

10 pulses are applied. The limit of

acceptance is a shift in resistance of less

than 1% from the initial value.

2512

2010

1206

0805

0603

General Note

TT Electronics reserves the right to make changes in product specification without notice or liability.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

BI Technologies IRC Welwyn

http://www.ttelectronics.com/resistors

Bedlington, Northumberland NE22 7AA, UK

Telephone: +44 (0) 1670

822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

07. 08

11.16

Pulse Withstanding

Chip Resistors

PWC Series

Single Impulse

The single impulse graph is the result of 50 impulses of rectangular shape applied at one minute intervals. The limit of acceptance was a shift in

resistance of less than 1% from the initial value.

2512

2010

1206

0805

0603

Continuous Load Due to Repetitive Pulses

The continuous load graph was obtained by applying repetitive rectangular pulses where the pulse period was adjusted so that the average

power dissipated in the resistor was equal to its rated power at 70°C. Again the limit of acceptance was a shift in resistance of less than 1% from the

initial value

2512

2010

1206

0805

0603

General Note

TT Electronics reserves the right to make changes in product specification without notice or liability.

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

BI Technologies IRC Welwyn

http://www.ttelectronics.com/resistors

11.16

Pulse Withstanding

Chip Resistors

PWC

Series

PWC

Series

Welwyn Components

Thermal Performance Data

% of Rated Power

Temperature Derating Curve

125

100

-15

Ambient Temperature /°C

155

Packaging

0603, 0805 and 1206 resistors are supplied on 8mm carrier tape and 2010 and 2512 resistors are supplied on 12mm carrier tape,

all on 7 inch reels as per IEC 286-3.

Application Note

PWC resistors themselves can operate at a maximum temperature of 155°C. For soldered resistors, the joint temperature should not exceed 110°C. This

condition is met when the stated power levels at 70°C and recommended pad and trace areas are used. Pad and trace area is defined as the total area of

the solder pad plus all copper trace within two squares of the edge of the solder pad. Allowance should be made if smaller areas of copper are used.

This

product has two valid part

part numbers:

This

product has two valid

numbers:

Ordering Procedure

A full Application Note on the PWC Series is available.

European (Welwyn) Part Number: PWC2512-2K0JI

(2512, 2 kilohms ±5%, Pb-free)

Type

Size

Anti-Sulphur

Value

Tolerance

D = ±0.5%

F = ±1%

J = ±5%

Termination & Packing

I = Standard,

0603

5000/reel

0805, 1206,

3000/reel

2010

2512

1800/reel

All sizes

1000/reel

PWC 0603 Omit for standard E24 = 3/4 characters

0805 AS = Anti-sulphur E96 = 3/4 characters

1206

R = ohms

2010

K = kilohms

2512

M = megohms

USA (IRC) Part Number: PWC-PWC2512LF-2K00-J

PWC

Size

1206

2010

2512

Termination

Value

(2512, 2 kilohms ±5%, Pb-free)

Tolerance

Packing

Plastic tape

1206, 2010

2512

3000/reel

1800/reel

Family Model

Omit for SnPb E24 = 4 characters D = ±0.5%

LF = Pb-free E96 = 4 characters F = ±1%

R = ohms

J = ±5%

K = kilohms

M = megohms

Bedlington, Northumberland NE22 7AA, UK

General Note

Telephone: +44 (0) 1670 822181

make changes in product specification

Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

TT Electronics reserves the right to

· Facsimile: +44 (0) 1670 829465 ·

without notice or liability.

BI Technologies IRC Welwyn

09. 09

http://www.ttelectronics.com/resistors

All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.

11.16

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