RESISTORS
RESISTORS
FLAT CHIP
TRIMMABLE THICK FILM
RK7n
STRUCTURE
1
7
8
Ceramic substrate
Top termination
(Ag Pd)
Bottom termination
(Ag)
Resistive layer
Glass layer
End termination
Diffusion barrier
(Ni)
End termination
IDEnTIFICATIOn
TYPE
RK7n
COATIng COLOR
Black resistive
layer (no coating)
MARKIng
None
Products with Pb-free terminations
meet EU-RoHS requirements
TYPE DESIgnATIOn (HOW TO ORDER)
RK7n
PRODUCT CODE
1J
STYLE
1E…W3A
T
TERMINATION
SURFACE MATERIAL
T: Sn
(L: Sn/Pb)
TD
TAPING*
TP, TD,
TE, BK
*Please see “PACKAGING”
10
NOMINAL
RESISTANCE
3 digits
P
TOLERANCE
Contact our sales representatives before you use our products for applications including
automotives, medical equipment and aerospace equipment . Malfunction or failure of the
products in such applications may cause loss of human life or serious damage .
Specifications given herein may be changed at any time without prior notice .
Please confirm technical specifications before you order/or use .
W: (±10%)
P: (0 . . .-30%)
N: (0 . . .-20%)
M: (±20%)
FEATURES
■
■
■
■
■
■
■
■
■
This trimmable chip resistor is suitable for the circuit
demanding stability as a replacement of variable resistor for
adjusting circuit (customers need laser trimming machines)
The resistance rising rate gets a limit value at the initial
resistance x 2 and differs depending on the trimming form
Glass passivated, supplied without protective coat
Excellent heat resistance and moisture resistance are ensured
by the use of metal glaze thick film
Anti-leaching nickel barrier terminations
Rated ambient temperature: + 70° C
Operating temperature range: - 55° C … + 125° C
Meets or exceeds IEC 60115-8, JIS C 5201-8, EIAJ RC-2134A
Suitable for reflow and wave soldering
DIMEnSIOnS (mm)
TYPE
RK7n 1E
RK7n 1J
RK7n A
RK7n B
RK7n E
RK7n WH*
RK7n WA*
L
+ 0 .1
1 .0
0 .05
–
1 .6 ±0 .2
2 .0 ±0 .2
3 .2 ±0 .2
5 .0 ±0 .2
6 .3 ±0 .2
W
0 .5 ± 0 .05
0 .8 ± 0 .1
1 .25 ± 0 .1
1 .6 ± 0 .2
2 .6 ± 0 .2
2 .5 ± 0 .2
3 .1 ± 0 .2
0 .2
0 .3
0 .4
c
± 0 .1
± 0 .1
± 0 .2
d
0 .25
– 0 .1
0 .3 ± 0 .1
+ 0 .2
0 .3
– 0 .1
+ 0 .2
0 .4
– 0 .1
+ 0 .05
t
0 .33 ±0 .05
0 .45 ±0 .1
0 .5 ±0 .1
0 .6 ±0 .1
0 .5 ± 0 .3
0 .65 ± 0 .15*
+ 0 .2
* RK73N 2H and RK73N 3A are also still available (different "d" dimensions = 0 .4 mm)
–
0 .1
RESISTAnCE InCREASE vs.TRIMMIng
Trimming by laser increases
the initial resistance .
Amount of resistance
increase is dependant on
the laser cut configuration
as shown .
W1 must not exceed 1/2 W
to ensure power rating of
the unit .
DERATIng CURVE
RATIng
SIZE
0402
0603
0805
1206
1210
2010
2512
TYPE
RK7n 1E
RK7n 1J
RK7n A
RK7n B
RK7n E
RK7n H
RK7n A
T.C.R.
(ppm/K)
± 200
POWER*
RATIng
0 .063 W
0 .1 W
0 .125 W
0 .25 W
0 .33 W
0 .75 W
1 .0 W
MAX.
WORKIng
VOLTAgE
50 V
100 V
200 V
MAX.
OVERLOAD
VOLTAgE
100 V
200 V
400 V
RESISTAnCE RAngE (E1)
n(0... -0%) • P(0...-0%) • W(± 10%) • M(± 0%)
10 Ω … 1 MΩ
*For resistors operated at an ambient temperature of +70°C or above, the power rating shall be derated like shown in above "DERATING CURVE" . Power ratings are changed by total trimmed length .
Rated voltage = Power rating x resistance value or max . working voltage, whichever is lower .
z
EUROPE GmbH • Kaddenbusch 6 • D-25578 Dägeling / ITZEHOE • PHONE: +49 (0) 48 21 / 89 89-0 • FAX: +49 (0) 48 21/ 89 89 89 • Internet: www.koaeurope.de
18
Revision: 31. Jan. 2008
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