
1
PS8203G 10/19/04
Description
The PI5A121/PI5A122/PI5A124 are analog switches designed
for single-supply operation. These high-precision devices are
ideal for low-distortion audio, video, signal switching and rout-
ing.
The PI5A121 is a single-pole throw (SPST) normally open (NO)
switch. The switch is open when IN is LOW. The PI5A122 is
a single-pole single-throw (SPST) normally closed (NC)
switch.
Each switch conducts current equally well in either direction
when on. When off, they block voltages up to V+.
These switches are fully specified with +5V, and +3.3V supplies.
With +5V, they guarantee <10 On-Resistance. On-Resistance
matching between channels is within 2. On-Resistance flatness
is less than 55 over the specified range. These switches also
guarantee fast switching speeds (t
ON
<20ns).
These products are available in 5-pin SC70 and/or 6-pin SOT23
plastic packages for operation over the industrial (-40
o
C to +85
o
C)
temperature range.
PI5A121/PI5A122/PI5A124
Wide Bandwidth Analog Switches
Features
Single-Supply Operation (+2V to +6V)
Rail-to-Rail Analog Signal Dynamic Range
Low On-Resistance (6 typ. with 5V supply)
Minimizes Distortion and Error Voltages
On-Resistance Flatness, 3 typ.
Low Charge Injection Reduces Glitch Errors. Q = 4pC typ.
High Speed. t
ON
= 10ns typ.
Wide -3dB Bandwidth: 326 MHz (typ.)
High-Current Channel Capability: >100mA
TTL/CMOS Logic Compatible
Low Power Consumption (0.5μW typ)
Small outline transistor package minimizes board area
Packaging (Pb-free & Green available):
- 5-pin 65-mil wide SOT23 (T) for PI5A121 and PI5A122
- 6-pin 65-mil wide SOT23 (T) for PI5A124
- 5-pin 50-mil wide SC70 (C) for PI5A121/PI5A122
Applications
Audio, Video Switching, and Routing
Battery-Powered Communication Systems
Computer Peripherals
Telecommunications
Portable Instrumentation
Mechanical Relay Replacement
Cell Phones
PDAs
Functional Diagrams, Pin Configurations and Truth Tables
Switches shown for Logic “0” input
COM
PI5A121
PI5A122
PI5A124
2
3
1
NO
GND
IN
V+
5
4
COM
IN
2
3
1
NC
GND
IN
V+
5
4
2
3
1
V+
GND
SOT23-6
NC
NO
COM
5
6
4
SOT23-5
SC70-5
SOT23-5
SC70-5
IN
0
1
PI5A121
OFF
ON
PI5A122
ON
OFF
PI5A124
LOGIC
0
1
NC
ON
OFF
NO
OFF