Analog Switches for use in portable and consumer applications, Fairchild Semiconductor

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Overview

Fairchild is the premier supplier for switch products for use in portable and consumer applications. Our Analog, Audio, Video and USB switches are used to minimize redundant circuitry, eliminate connectors, allow for design flexibility in feature offerings and to save space in your design. Offered in a variety of functions, configurations, packages and performance levels, Fairchild switches can help you solve your specific design challenges.

Products: Analog Switches

Featured Products

Part #	Configuration	Low I_CCT	On Re sistance (R_ON) Ohm	Supply Voltage Range (V_CC)	Bandwidth (MHz)	C_ON (pF)	Package
FSA6157	2X SP3T	X	0.8	1.65V-4.3V	150	14.5	6 lead micropak
FSA3259	2X SPST	X	9.0	1.65V-5.5V	250	14.5	SC70, MicroPak
FSA2156	1X SPST	X	0.7	1.65V-5.5V	80	115	DQFN
FSA1156	1x SPST (NO)		0.75	1.65V - 5.5V	350	65	SC70, MicroPak^TM 6
FSA1157	1x SPST (NC)		0.75	1.65V - 5.5V	350	65	SC70, MicroPak^TM 6
FSA1256	2x SPST (NO)		0.95	1.65V - 5.5V	300	27	MicroPak^TM 8
FSA1256A	2x SPST (NO)	X	0.95	2.7V - 5.5V	300	27	MicroPak^TM 8
FSA1257	2x SPST (NC)		0.95	1.65V - 5.5V	300	27	MicroPak^TM 8
FSA1257A	2x SPST (NC)	X	0.95	2.7V - 5.5V	300	27	MicroPak^TM 8
FSA1258	2x SPST (NO/NC)		0.95	1.65V - 5.5V	300	27	MicroPak^TM 8
FSA1258A	2x SPST (NO/NC)	X	0.95	2.7V - 5.5V	300	27	MicroPak^TM 8
FSA2257	2x SPDT		0.95	1.65V - 5.5V	350	40	MicroPak^TM 10, TSSOP 14
FSA2267	2x SPDT		0.35	1.65V - 3.6V	45	126	MicroPak^TM 10
FSA2267A	2x SPDT	X	0.35	2.3V - 4.3V	45	126	MicroPak^TM 10
FSA2467	2x DPDT	X	0.40	1.65V - 4.3V	85	118	MLP 16, TSSOP 16
FSA3157 / FSAU3157	1x SPDT		5.0	1.65V - 5.5V	250	19	SC70, MicroPak^TM 6
FSA4157	1x SPDT		0.95	1.65V - 5.5V	350	40	SC70, MicroPak^TM 6
FSA4157A	1x SPDT	X	0.95	1.65V - 5.5V	350	40	SC70, MicroPak^TM 6
FSA5157	1x SPDT	X	0.40	2.3V - 4.3V	50	6	SC70, MicroPak^TM 6
FSA2268	2X SPDT	X	0.4	1.65V-4.3V	50	120	UMLP
FSA4159	SPDT	X	1	1.65V-5.5V	100	41	SC70
FSA2380	DP3T	X	0.75	2.7V-4.3V	120	70	DQFN, TSSOP

Collateral and Literature


Analog Switch Guide	Switch Selection Guide	2x SPDT Audio Flyer
English \| Simplified Chinese	English \| Simplified Chinese	English \| Simplified Chinese


	1x SPDT Audio Flyer
	English

Application Notes

Application Note	Description
AN-6019	ESD Test Methodology Overview
AN-5064	Low-I_CCT Analog Switches for Ultra-Portable Designs
AN-5064-SC	Simplified Chinese - 满足便携设计的低漏电流模拟开关
AN-5064-TC	Traditional Chinese - 滿足便攜設計的低漏電流模擬開關
AN-6019-C	ESD - 性能测试方法概要

Sample Application Diagrams

The FSA2467 can be used to share differential audio sources with one set of speakers.

The FSA1156 can be used to isolate or share a connector.

Frequently Asked Questions

Find more answers in our Question and Answers Section

1. Should an analog switch be selected primarily based on On Resistance (Ron)?
A. No. On resistance is very important but each application is unique and the trade-off between Ron and Con needs to be fully understood. Low Ron (1 ohm or less) devices will have greater on-capacitance so for capacitive sensitive, high frequency or high speed data rate applications the low Con is the more critical parameter.

2. What is Ron Flatness for an Analog Switch?
A. Ron (flatness) is a measure of the “peak” and “valley” of the composite analog switch Ron. If this parameter is large then the composite, Ron can cause variable attenuation, which is particularly bad for audio applications. The FSA-family of switches are specifically designed to minimize this variable attenuation. A low Ron (flatness) also results in excellent THD characteristics (Total Harmonic Distortion).

3. When I apply a lower voltage to the switch control pin than what is applied to Vcc, my application consumes a significant amount of current, how can I resolve this?
A. For this application scenario the devices needed are those that are defined as “Low Icct”. Low-Icct devices are our A-version devices (for example, FSA2267A) or on newer generation products they will simply have an Icct specification in the datasheet (for example, FSA2156). Products with low Icct minimize power consumption without the need of a voltage translator. (for additional information, please read applications note An-5064)

4. Can an analog switch pass a digital signal?
A. Yes, an analog switch can pass a digital signal. Since the analog switch is an NMOS/PMOS transmission gate there is also no voltage translation or clamping action so the preferred choice may be the analog switch over a digital switch.

Product Information

Product Selection and Datasheets

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