Power Management ICs, Power Semiconductors, Signal Path ICs, Lighting and Display, Logic, Optoelectronics, Fairchild Semiconductor

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Overview

Fairchild's audio switches offer various levels of On Resistance ( as low as 0.35ohms), small scale packaging ( as small as 1.45mm sqd) and are available in the most common switch configurations. All are designed to minimize THD, leakage current and crosstalk while maximizing ESD and Off Isolation.

The Low Icct switches allow the control pin(s) to have a lower voltage swing on its input, while minimizing power consumption. As a result, low Icct switches optimize battery life.

Products: Audio Switches

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Featured Products

Part #	Configuration	Low I_CCT	On Resistance (R_ON) Ohm	Supply Voltage Range (V_CC)	Bandwidth (MHz)	C_ON (pF)	Package
FSA201	Double pole, double throw switch	X	3.0	1.65V-5.5V	400	29	10 leaf MSOP
FSA201	Double pole, double throw switch	X	1.0	1.65V-5.5V	400	25	10 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
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
FSA2380	SPDT	X	1	1.65V-5.5V	100	41	SC70

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

Sample Application Diagrams

The FSA4157 is well suited for sharing single ended audio or other signals which require low On Resistance.

The FSA4157A includes our low Icct Circuitry which allows for direct interface with low voltage ASICS. (see App Note 5064)

Frequently Asked Questions

Find more answers in our Question and Answers Section

1. What are the key parameters to consider when selecting an audio switch?
A. THD (total harmonic distortion) , On resistance, Ron flatness are the key features of Fairchild audio switches.

2. What is the difference between ‘A’ and ‘non-A’ audio switches?
A. The ‘A’ designator for the audio switches specifies the “Low-Icct” feature. This feature allows the control buffer input to be sourced by a lower Vcc GPIO with minimal impact in current consumption. This in turn extends battery life. (for additional information, please read applications note An-5064)

3. Can I switch a negative signal through my Audio switch?
A. Yes, Fairchild Semiconductor offers several audio switches with negative swing capabilities, the FSA2269TS, FSA2270T, FSA2271T, FSA2367, and the FSA2380.

4. Fairchild specifies a very high ESD rating on their audio switches, how are these values derived?
A. We test all switches to both the Human Body Model (HDM) and Charged Device Model (CDM) as outlined in the JEDEC standards JESD22- A114C-01 and JESD22-C101C respectively. Many switches also have specifications for Machine Model (MM). In addition, our ESD values specified are for contact rather than air discharge which also demonstrates a superior performance. Fairchild Semiconductor has leading edge technology to provide extremely robust ESD protection within our switches. Many Fairchild Semiconductor switches have HBM contact ESD as high as 7-8kV contact.

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