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BLF881; BLF881S
UHF power LDMOS transistor
Rev. 3 -- 7 December 2010 Product data sheet
1. Product profile
1.1 General description
A 140 W LDMOS RF power transistor for broadcast transmitter applications and industrial
applications. The transistor can deliver 140 W 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 = 50 V in a common-source 860 MHz test circuit.
Mode of operation f PL PL(PEP) PL(AV) Gp D IMD3 IMDshldr
(MHz) (W) (W) (W) (dB) (%) (dBc) (dBc)
2-tone, class AB f1 = 860; f2 = 860.1 - 140 - 21 49 -34 -
DVB-T (8k OFDM) 858 - - 33 21 34 - -33[1]
[1] Measured [dBc] with delta marker at 4.3 MHz from center frequency.
CAUTION
This device is sensitive to ElectroStatic Discharge (ESD). Therefore care should be taken
during transport and handling.
1.2 Features and benefits
2-Tone performance at 860 MHz, a drain-source voltage VDS of 50 V and a quiescent
drain current IDq = 0.5 A:
Peak envelope power load power = 140 W
Power gain = 21 dB
Drain efficiency = 49 %
Third order intermodulation distortion = -34 dBc
DVB performance at 858 MHz, a drain-source voltage VDS of 50 V and a quiescent
drain current IDq = 0.5 A:
Average output power = 33 W
Power gain = 21 dB
Drain efficiency = 34 %
Shoulder distance = -33 dBc (4.3 MHz from center frequency)
Integrated ESD protection
Excellent ruggedness
High power gain
NXP Semiconductors BLF881; BLF881S
UHF power LDMOS transistor
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
BLF881 (SOT467C)
1 drain
1
2 gate
3 source [1]
2
3
sym112
BLF881S (SOT467B)
1 drain
1 1
2 gate
3 source [1]
3
2
3
2 sym112
[1] Connected to flange.
3. Ordering information
Table 3. Ordering information
Type number Package
Name Description Version
BLF881 - flanged LDMOST ceramic package; 2 mounting holes; 2 leads SOT467C
BLF881S - earless LDMOST ceramic package; 2 leads SOT467B
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