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PD85004
RF power transistor
the LdmoST plastic family

Features
Excellent thermal stability
Common source configuration
Broadband performances
POUT = 4 W with 17 dB gain @ 870 MHz
Plastic package
ESD protection SOT-89
Supplied in tape and reel
In compliance with the 2002/95/EC european
Figure 1. Pin connection
directive

Description Source
The PD85004 is a common source N-channel,
enhancement-mode lateral field-effect RF power
transistor. It is designed for high gain, broad band
commercial and industrial applications. It
operates at 13.6 V in common source mode at
frequencies of up to 1 GHz.
PD85004's superior gain and efficiency makes it
an ideal solution for mobile radio. Source
Gate Drain




Table 1. Device summary
Order code Marking Package Packaging

PD85004 8504 SOT-89 Tape and reel




August 2008 Rev 2 1/18
www.st.com 18
Contents PD85004


Contents

1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Static . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Dynamic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 ESD protection characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Moisture sensitivity level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Impedances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 DC curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 RF curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Schematic and BOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7 Demonstration board photo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1 Thermal pad and via design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8.2 Soldering profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17




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PD85004 Electrical data


1 Electrical data

1.1 Maximum ratings

Table 2. Absolute maximum ratings (TCASE = 25