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BLF871; BLF871S
UHF power LDMOS transistor
Rev. 04 -- 19 November 2009 Product data sheet
1. Product profile
1.1 General description
A 100 W LDMOS RF power transistor for broadcast transmitter applications and industrial
applications. The transistor can deliver 100 W broadband from HF to 1 GHz. The
excellent ruggedness and broadband performance of this device makes it ideal for digital
transmitter applications.
Table 1. Typical performance
RF performance at VDS = 40 V in a common-source 860 MHz test circuit.
Mode of operation f PL PL(PEP) PL(AV) Gp D IMD3 PAR
(MHz) (W) (W) (W) (dB) (%) (dBc) (dB)
CW, class AB 860 100 - - 21 60 - -
2-tone, class AB f1 = 860; f2 = 860.1 - 100 - 21 47 -35 -
DVB-T (8k OFDM) 858 - - 24 22 33 -34[1] 8.3[2]
[1] Measured [dBc] with delta marker at 4.3 MHz from center frequency.
[2] PAR (of output signal) at 0.01 % probability on CCDF; PAR of input signal = 9.5 dB at 0.01 % probability on
CCDF.
CAUTION
This device is sensitive to ElectroStatic Discharge (ESD). Therefore care should be taken
during transport and handling.
1.2 Features
2-tone performance at 860 MHz, a drain-source voltage VDS of 40 V and a quiescent
drain current IDq = 0.5 A:
Peak envelope power load power = 100 W
Power gain = 21 dB
Drain efficiency = 47 %
Third order intermodulation distortion = -35 dBc
DVB performance at 858 MHz, a drain-source voltage VDS of 40 V and a quiescent
drain current IDq = 0.5 A:
Average output power = 24 W
Power gain = 22 dB
Drain efficiency = 33 %
Third order intermodulation distortion = -34 dBc (4.3 MHz from center frequency)
NXP Semiconductors BLF871; BLF871S
UHF power LDMOS transistor
Integrated ESD protection
Excellent ruggedness
High power gain
High efficiency
Excellent reliability
Easy power control
Compliant to Directive 2002/95/EC, regarding Restriction of Hazardous Substances
(RoHS)
1.3 Applications
Communication transmitter applications in the UHF band
Industrial applications in the UHF band
2. Pinning information
Table 2. Pinning
Pin Description Simplified outline Graphic symbol
BLF871 (SOT467C)
1 drain
1
2 gate 1
3 source [1]
3
2
3
2 sym112
BLF871S (SOT467B)
1 drain
1
2 gate
[1] 1
3 source
2
3 3
sym112
2
[1] Connected to flange.
3. Ordering information
Table 3. Ordering information
Type number Package
Name Description Version
BLF871 - flanged LDMOST ceramic package; 2 mounting holes; 2 leads SOT467C
BLF871S - earless LDMOST ceramic package; 2 leads SOT467B
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