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Aluminium Housed, Chassis Mount (PHA)

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Key Features


External Aluminium Encasing.
Power Rating 25W, 50W.
Excellent Stability in Operation.
Non-Inductive & Close Tolerance.
All Welded Construction for Maximum Reliability.
Moulded Construction for Excellent Environmental Protection.
     BS-CECC-40203-001
      MIL-R-18546
Specifications
Electrical Specifications

PHA25
PHA50
Tolerance

±0.05%, ±0.1%, ±0.25%, ±0.5%, ±1%, ±2%, ±3%, ±5%, ±10%
TCR
For <10 Ohms: < ±100ppm/°C ; For >10 Ohms: < ±50ppm/°C
Resistance Range
R051 - 20K
R010 - 100K
Dielectric Strength
2500 V
2500 V
Max.Working Voltage
2500 V
1250 V
Surface Temp.Rise Mounted on a Std. Heat Sink in °C / Watt
4
2.9
Std. Heat Sink Area
535 cm2
535 cm2
Std. Heat Sink Thickness
1 mm
1 mm
Approx. Weight
12.5 gm
29 gm
Dissipation @25°C (With Heat Sink)
25 W
50 W
Dissipation @25°C (Without HeatSink)
12.5
20
Stability at Rated Power
±1%
±1%
CECC Style Reference
CA
DA
MIL - Style
RE70
RE75
Climatic Category
55/200/56
55/200/56
Environmental Specifications
Test Methods
Test Conditions
Test Limits
Endurance at Room Temperature
 As per BS-CECC (1.5Hrs ON, 0.5Hrs OFF for 1000Hrs) rR < 1% +0R05
Short Term Overload
 5 x Rated Power or Isolation Voltage (Lesser of the two Voltages) rR < 1% +0R05
Robustness of Terminations As per BS-CECC-4.14.2, 20N Tensile Force rR < 0.25% +0R05
Resistance to Soldering Heat As per BS-CECC-4.15.2, 260°C, 10 Seconds rR < 0.25% +0R05
Rapid Change of Temperature -55°C/200°C, 5 Cycles as per BS-CECC-4.16 rR < 0.25% +0R05
Bump 4000 Bumps at 40g as per Clause 4.17 rR < 0.25% +0R05
Vibration 10Hz to 500Hz, 0.75mm Amplitude or 10g, 6 hrs rR < 0.25% +0R05
Damp Heat Steady State 90-95% RH, 40°C, 56 Days Clause 4.21 rR < 1% +0R05
Dimensions


Specifications Table

PEC
Type

H

J

L
M
N
P
R
T
U
± 0.3
[± 0.012]
± 0.3
[± 0.012]
Max
Nom
Max
Nom
Max
Min
Nom
± 0.3
[± 0.012]
Max
Nom

PHA25

 18.3
[0.72]

19.8
[0.78]

29
[1.142]

27.5
[1.082]

51.8
[2.039]
28
[1.102]
15
[0.590]
2.8
[0.110]
3.3
[0.130]
6.7
[0.283]
3.2
[0.126]
2.0
[0.079]
PHA50 39.7
[1.563]

21.4
[0.843]
51
[2.008]
50.0
[1.969]

72.5
[2.854]
30
[1.181]
17
[0.669]
2.8
[0.110]
3.3
[0.130]
7.9
[0.311]
3.2
[0.126]
2.3
[0.091]
 Ordering Code

PEC
Type

  

Ohmic
Value

  

Tolerance

 

Packing
Style

 

Release
Condition

 
Special
Requirements

PHA25

  
     0.1 Ohm     a0R1 / R10
  

1%  a F

  

Bulk a B

  

Commercial a X

  
Standard a S
   
     1 Ohm       a 1R0
 
2%  a G
  
 
CECC        a F
 
          Others   a M
   

    1 KOhm      a 1K0

 
5%  a J
 
 
MIL             a M
  
   
     10.7 KOhm  a 10K7
  
10% a K
  
 
JSS             a J
  
A Sample Part No.: PHA25 1K0 FBXS

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