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Available on Tape
and Reel for Pick and
Place Manufacturing. 
USA/Canada:
Toll Free:
Europe: 
(315) 432-8909
(800) 411-6596
+44 2392-232392
 
Model BD4859N5050AHF
Rev A
 
Ultra Low Profile 0404 Balun
50 to 50 Balanced
 
 
Description
 
 
 
 
 
 
 
  The B4859N5050AHF is a low cost, low profile sub-miniature unbalanced to
balanced transformer designed for differential inputs and output locations on modern
chipsets in an easy to use surface mount package covering 802.11a Uni-Band II &
III and the Japanese ISM band (4.9 GHz). The B4859N5050AHF is ideal for high
volume manufacturing and delivers higher performance than traditional ceramic
baluns. The B4859N5050AHF has an unbalanced port impedance of 50& and a
50& balanced port impedance. This transformation enables single ended signals to
be applied to differential ports on modern integrated chipsets. The output ports have
equal amplitude (-3dB) with 180 degree phase differential. The B4859N5050AHF is
available on tape and reel for pick and place high volume manufacturing. 
Detailed Electrical Specifications:
 Specifications subject to change without notice.
 
ROOM (25?/DIV>
??/DIV>
癈)
 
Parameter
Min.
Typ.
Max
Unit
Frequency
4800
 
5900
MHz
Unbalanced Port Impedance
 
50
 
 
Balanced Port Impedance
 
50
 
 
Return Loss
16
22
 
dB
Insertion Loss*
 
0.5
0.7
dB
Amplitude Balance
 
0.7
1.2
dB
Phase Balance
 
3
7
Degrees
CMRR
 
27
 
dB
Power Handling
 
 
1.0
Watts
 
Features:
 
" 4800  5900 MHz
" 0.56 mm Height Profile
" 50 Ohm to 2 x 25 Ohm
" Low Insertion Loss
" 802.11a Uni-Band II & III
" Home Cordless Compliant
" Surface Mountable
" Tape & Reel
" Non-conductive Surface
" RoHS Compliant
" Halogen Free
 
 
Operating Temperature
-55
 
+85
篊
* Insertion Loss stated at room temperature (Insertion Loss is approximately 0.1 dB higher at +85 篊)
Outline Drawing
 
Mechanical Outline
Dimensions are in Inches [Millimeters]
Tolerances are Non-Cumulative
Bottom View (Far-side)
Side View
Top View (Near-side)
Unbalanced Port
GND / DC Feed
+ RF GND
4
3
Designation
Pin
1
2
1
2
3
4
Balanced Port
.041?/SPAN>.004
 [1.04
?.10
]
.041
?004
 [1.04
?.10
]
.022?/SPAN>.002
 [0.56
?.05
]
.020 [0.51]
.020 [0.51]
3x.010
 [0.25]
3x.010
 [0.25]
Balanced Port
.012 [0.30]
.012 [0.30]
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