Alpha Industries, Inc. [781] 935-5150

• Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com

1

Specifications subject to change without notice. 11/99A

PHEMT GaAs IC High Linearity Positive

Control SPDT Switch DC–2 GHz

Features

I High Linearity (50 dBm IP3 @ 0.9 GHz)

@ 3 V

I Low Insertion Loss (0.35 dB @ 0.9 GHz)

I Isolation (21 dB @ 0.9 GHz)

I +3 V Operation

I Ultra Miniature SOT-6 Package

I PHEMT Process

SOT-6

AS178-73

0.074

(1.90 mm REF.)

0.071 (1.80 mm)

0.052 (1.30 mm)

0.037 (0.95 mm) REF.

0.122 (3.10 mm)

0.106 (2.70 mm)

0.006

(0.15 mm)

0.000

(0.00 mm)

0.057 (1.45 mm)

0.035 (0.90 mm)

0.020 (0.51 mm)

0.014 (0.350 mm)

0.126 (3.20 mm)

0.087 (2.20 mm)

PIN 6

PIN 1

PIN 1

INDICATOR

0.022 (0.61 mm)

0.004 (0.10 mm)

0.014

(0.26 mm)

0.004

(0.10 mm)

0.012

(0.30 mm)

TYP.

5.0˚ ± 1˚

5.0˚ ± 1˚

Description

The AS178-73 is a PHEMT GaAs FET IC high linearity

SPDT switch in a SOT-6 plastic package. This switch has

been designed for use where extremely high linearity, low

insertion loss and ultra miniature package size are

required. It can be controlled with positive, negative or a

combination

of

both

voltages.

Some

standard

implementations include antenna changeover, T/R and

Min.

Typ.

Max.

Unit

DC–0.5 GHz

0.45

0.6

dB

DC–1.0 GHz

0.45

0.6

dB

DC–2.0 GHz

0.55

0.7

dB

Isolation

DC–0.5 GHz

25

28

dB

DC–1.0 GHz

20

23

dB

DC–2.0 GHz

14

17

dB

DC–1.0 GHz

1.2:1

1.4:1

DC–2.0 GHz

1.3:1

1.8:1

Electrical Specifications at 25°C (0, +3 V)

Preliminary

Parameter

Condition

Frequency

Min.

Typ.

Max.

Unit

Rise, Fall (10/90% or 90/10% RF)

60

ns

On, Off (50% CTL to 90/10% RF)

100

ns

Video Feedthru

50

mV

Input Power for 1 dB Compression

0/+3 V

0.9 GHz

+34

dBm

0/+5 V

0.9 GHz

+38

dBm

Intermodulation Intercept Point (IP3)

For Two-tone Input Power +17 dBm

0/+3 V

0.9 GHz

+50

dBm

0/+5 V

0.9 GHz

+57

dBm

Control Voltages

Operating Characteristics at 25°C (0, +3 V)

1. All measurements made in a 50

Ω system, unless otherwise specified.

2. DC = 300 kHz.

3. Insertion loss changes by 0.003 dB/°C.

4. Insertion loss state.

5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.

diversity switching over 2 W. The AS178-73 switch can be

used in many analog and digital wireless communication

systems including cellular, GSM and DECT applications.