24
Ultra-Precision Power Resistor
(10 Watts)
Composition of Type Number
PB X 50R000 B
Tolerance
Resistance Value
TCR
Type
Example:
Configuration
Type
L
L1
L2
W
T
T1
F
D
d
PB PC
␾0.8±0.05 ␾1.2±0.05
40.0±0.2
20.0±0.2
30.0±0.5
20.0±0.2
5.0±0.2
1.0±0.1
15.0±0.5
30±10
␾0.4
Dimensions in mm
F
W
D
T
T1
d
L1
L2
L
PB
F
W
I
I
V
IV
IV
V
D
T
T1
d
L1
L2
L
PC
Schematic of PC
4-Terminal Connection
TCR, Resistance Range, Tolerance, Rated Power
Type
PB
PC
TCR (ppm/°C)
-55°C to +125°C Resistance
Range (⍀)Resistance Tolerance (%)* Rated
Power (W)
at 25°C
0±15 (W)
0±15 (W)
0±15 (W)
0±5 (X)
0±15 (W)
0±5 (X)
0±2.5 (Y)
0±15 (W)
0±5 (X)
0±2.5 (Y)
0.4 to 1
1 to 5
5 to 10
10 to 25
25 to 50
50 to 50k
0.002 to 0.05
0.05 to 0.1
0.1 to 5
5 to 10
10 to 25
25 to 100
±0.01 to ±5 (T, Q, A, B, D, F, G, J)
±1 to ±5 (F, G, J)
±0.5 to ±5 (D, F, G, J)
±0.1 to ±5 (B, D, F, G, J)
±0.05 to ±5 (A, B, D, F, G, J)
±0.02 to ±5 (Q, A, B, D, F, G, J)
±0.5 to ±5 (D, F, G, J)
±0.5 to ±5 (D, F, G, J)
±0.1 to ±5 (B, D, F, G, J)
±0.05 to ±5 (A, B, D, F, G, J)
±0.02 to ±5 (Q, A, B, D, F, G, J)
±0.01 to ±5 (T, Q, A, B, D, F, G, J)
2
10
On
heat sink**
Symbols in parentheses are for type number composition.
*Resistance figures for type PB are the values obtained by measuring the leads at
point 12.7±3.2mm away from the root, but in case of resistance below 10 ohm, the
values at 5.08±0.6mm away.
**For heat sinking, an aluminum chassis in 152.4 (L) x 101.6 (W) x 50.8 (H) x 1.0mm (T)
shall be used.
Power Derating Curve
20 40 60 80 100
Rated Power Percentage
100
80
60
40
20
(%)
(¡C)160
155
120
25
140
Ambient Temperature
Resistance value, in ohm, is expressed by a series of six characters, five of
which represent significant digits. The sixth R or K is a dual-purpose letter that
designates both the value range (R for ohmic; K for kilo-ohm) and the location
of decimal point.
PC
PB
25
Performance
Parameters Test Condition ALPHA Typical Test Data
25°C
-55°C to +155°C
750V
PB=5A, PC=32A
±0.2%
±1.0%
±1.0%
over 95% coverage
±0.02%
±0.01%
±0.01%
over 95% coverage
Maximum Rated Operating Temperature
Working Temperature Range
Maximum Working Voltage
Maximum Working Current
Life
High Temperature Exposure
Power Conditioning
Solderability
±0.2%
±0.2% ±0.005%
±0.005%
Shock
Vibration, High Frequency 100G, 6ms., Sawtooth Wave, X, Y, Z, each 3 shocks
20G, 10Hz to 2,000Hz to 10Hz, 20 min., X, Y, Z, each 4 hrs.
25°C, Rated Power, 1.5 hr. – ON, 0.5 hr. – OFF, 2,000 hrs.
155°C, No Load, 2,000 hrs.
±0.3%
±0.2%
over 10,000M⍀
±0.3%
±0.3%
±0.5%
±0.2%
±0.005%
±0.005%
over 10,000M⍀
±0.005%
±0.01%
±0.05%
±0.005%
Low Temperature Storage
Dielectric Withstanding Voltage
Insulation Resistance
Low Temperature Operation
Overload
Moisture Resistance
Terminal Strength
-55°C, No Load, 24 hrs.
Atmospheric: AC 1KV, 1 min. Barometric: AC 500V, 1min.
DC 500V, 2 min.
-55°C, Rated Voltage
Rated Voltage x 2.5, 5 sec.
+65°C to -10°C, 90% RH to 98% RH, Rated Voltage, 10 cycles (240 hrs.)
2.27kg (5 pounds),10 sec.
245°C, 5 sec.
25°C, Rated Voltage, 96 hrs.
MIL-R-39009 Specification
Frequency Characteristics
1 5 10 50 100 (MHz)
Frequency
R(AC)/R(DC)
150
100
50
(%)
PB
1
⍀
0
.4
⍀
100
⍀
2k
⍀
10
⍀
12345678910
On Aluminum Chassis
Temperature Rise
60
70
50
40
30
20
10
(W)
Applied Power
⌬
T
(¡C)
B
(19.2¡C/W)
B (4.9¡C/W)
A (3.4¡C/W)
A (15.5¡C/W)
In Free Air
Spots for Temperature Measurement
(in still air)
Aluminum Chassis
Screwed Down
A: Mold Surface
B: Element Surface
152.4mm (L) x 101.6mm (W)
x 50.8mm (H) x 1.0mm (T)
Four-Terminal Resistor
r1
r3
ii
r2
r4
V
I
V
I
Resistance Value of Lead: 0.36
⍀
/
c
m
TC
RofLead:3
,9
00
ppm/¡C
1
0.
1
0.0
1
0.00
1
0.000
1
0.0000
1
(%)
1k1
00
1
0
1
0.
1N
o
m
inal Resistance Value
(
⍀
)
␾
0.
8
S
olde
r-P
lated
C
o
pp
e
r
/
L
=
1
c
m
1
00
1
0
1
0.
1
0.0
1
0.00
1
(ppm/¡C)
Resistance
Value
TC
R
A
dditional Resistance Value
A
dditional
TC
R
Affect of PB type lead for resistance value and TCR
Temperature of Resistor Surface
For low ohmic resistor (less than 10 ohm), the resistance value and TCR of the
copper lead increases overall resistance value. Four-terminal (Kelvin) connection
is recommended per the following figure. Loading current at voltage and current
terminals (V, I) causes measurement error.
Four-Terminal Resistor