09.14

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.

© TT Electronics plc

http://www.ttelectronics.com/resistors

BI Technologies IRC Welwyn

Fibre Core Conformal

Wirewound Resistor

Fibre Core Conformal Coated

Wirewound Resistor

SPP Series

Make Possible

09.14

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.

© TT Electronics plc

www.ttelectronicsresistors.com

Fibre Core Conformal Coated

Wirewound Resistor

SPP Series

www.bitechnologies.com www.irctt.com www.welwyn-tt.com

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.

© TT electronics plc

11.13

• 4222 South Staples Street • Corpus Christi Texas 78411 USA

Wire and Film Technologies Division

Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com

Power Derating Curve

Sample Part No.

IRC Type

Power

(See Electrical Data chart for other power ratings)

Recognition

UL = UL1412 recognised (optional characters)

Resistance Value

Expressed in ohms

(Standard EIA/MIL values)

Tolerance

J = ±5%, K = ±10% standard

Ordering Data

LF

Low-Cost General Purpose

Conformal Coated

Wirewound Resistor

Temperature Rise Curve

80

100

60

40

20

0

Ambient Temperature (°C)

0

50

100

150

200

250

300

SPP-3

SPP-1, 2

200

300

100

Percent Rated Power

0

20

40

60

80

0

100

SPP-3

SPP-2

SPP-1

SPP Series Issue December 2008 Sheet 3 of 3

1

10

100

10

15

20

25

30

35

40

45

50

55

60

Initial Power (W)

SPP1 Fusing Characteristic

(Maximum & Typical Fusing Times)

Maximum

Typical

1

10

100

1000

10

15

20

25

30

35

40

45

50

55

60

Initial Power (W)

SPP2 Fusing Characteristic

(Maximum & Typical Fusing Times)

Maximum

Typical

SPP Series Pulse Energy Limit

single or low repetition rate, ΔR <5%)

Value (ohms)

SPP1

SPP2

1

0

1

2

3

4

5

6

7

10

100

1000

10000

1.2/50us Peak Voltage Limit

(10 pulses at 30s intervals, ΔR <5%)

Value (ohms)

SPP2

SPP1

1

0

1

2

3

4

5

6

7

10

100

1000

10000

Note: After fusing the ohmic value is at least 100 times the initial value, provided

initial power ≥ 25W is applied.

Note: After fusing the ohmic value is at least 100 times the initial value, provided

initial power ≥ 40W is applied.

Ordering Procedure

Example: SPP1UL4700JLF (SPP1, UL recognised, 470 ohms ±5%, Pb-free)

S

P

P

1 U L

4

7

0

0

J

L

F

1

2

3

4

5

6

1

2

3

4

5

6

Type

UL Status

Value

Tolerance

Packing &

Termination Finish

Custom

Code

SPP1 UL = UL recognised 3 digits + multiplier

J = ±5%

Omit for SnPb

Optional

SPP2 (SPP1 & SPP2 only,

see Electrical Data for

applicable values.)

R = ohms for values

<100 ohms

K = ±10%

LF = Pb-free

SPP3

Standard packing is

tape & reel, 4000/reel