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Model BD4859N5050AHF
Rev C
Ultra Low Profile 0404 Balun
50Ω to 50Ω Balanced
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 50Ω and a
50Ω 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.
Features:
• 4800 – 5900 MHz
• 0.57 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
ROOM (25°
°°
°C)
Parameter Min. Typ. Max Unit
Frequency 4800 5900 MHz
Unbalanced Port Impedance 50 Ω
Balanced Port Impedance 50 Ω
Return Loss 13 20 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 @85C 1.0 Watts
Power Handling @105C 0.6 Watts
Operating Temperature -55 +105
ºC
* Insertion Loss stated at room temperature (Insertion Loss is approximately 0.1 dB higher at +85 ºC)
Outline Drawing
1.04
±.10
1.04
±.10
.57
±.05
.30
.30
.50
.50
3x .25
3x .25
1
2
4
3
Bottom View (Far-side)Side ViewTop View (Near-side)
Mechanical Outline
Dimensions are in Millimeters
Tolerances are Non-Cumulative
Unbalanced Port
GND / DC Feed
+ RF GND
4
3
Designation
Pin
1
2
Balanced Port
Balanced Port
3x .27
3x .27
.24
.24
