BFS520 datasheet(73/130 Pages) NXP

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NXP Semiconductors RF Manual 16th edition

2.6.4

High-performance,small-sizepackagingenabledbyNXP'sleadlesspackageplatform

andWL-CSPtechnology

RF small-signal packaging is driven by two major trends which partly overlap

` Lower parasitics for better RF performance

` Smaller form factors for portable applications

To cope with these trends, NXP uses several approaches

` For non-space-restricted applications the use of flat-pack packages instead of gull-wing versions reduces the parasitic

impedance because of shorter lead length (e.g. SOT343F instead of SOT343). This results in better RF performance in

the Ku and Ka bands (13-20GHz). To reduce PCB board space, a smaller version (SOT1206) is also available.

SOT343

SOT343F

SOT1206

` For space-restricted applications there are two routes to reduce the form factor and parasitics:

- Leadless package platform

- Wafer Level Chip Scale Package (WL-CSP) technology

The leadless package (UTLP) platform (>25 variants already

released) is highly flexible with respect to package size,

package height, and I/O pitch. For example, the 6-pin

packages range in size from 1.45 x 1 x 0.5 mm with 0.5 mm

pitch to 0.8 x 0.8 x 0.35 mm with 0.3 mm pitch. Package height

of 0.25 mm is planned.

Because of the compact size of the design, wire lengths and

parasitic impedance are also restricted. The absence of leads

further reduces the inductance.

Wafer Level Chip Scale Package technology is ideally for

RF functions where the I/O pitch has to fit within the chip

area. With larger pitches and smaller designs (and thus little

effective chip area), it is more cost-effective to do the fan-out

using a leadless package instead of increasing the chip size.

The absence of wires gives the lowest parasitic inductance

available.

SOT886

SOT891

SOT1208

0.65 x 0.44 x 0.29 mm (incl. 0.09 mm balls)

5 I/Os @ 0.22 mm pitch

BFS520 数据表(PDF) 73 Page - NXP Semiconductors

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