El NC7SB3157P6X de onsemi (anteriormente Fairchild) es un conmutador anal\u00f3gico SPDT de bajo voltaje o conmutador de bus multiplexor\/demultiplexor 2:1 en un encapsulado SC-70 (SC-88\/SOT-363) de 6 patillas. Funciona de 1,65 V a 5,5 V con una resistencia de activaci\u00f3n t\u00edpica de 3-7 Ohm a 4,5 V, manejo de se\u00f1al de carril a carril, conmutaci\u00f3n break-before-make y ancho de banda de 250 MHz -3 dB. El pin de selecci\u00f3n (S) elige entre los puertos B0 y B1 conectados al puerto A. Entrada de control tolerante a sobretensi\u00f3n hasta 7 V. El rango de temperatura de funcionamiento es de -40C a +85C. El sufijo P6X indica cinta y carrete SC-70 (3000 unidades\/carrete).<\/p>","protected":false},"excerpt":{"rendered":"
The NC7SB3157P6X from onsemi (formerly Fairchild) is a low-voltage SPDT analog switch or 2:1 multiplexer\/demultiplexer bus switch in a 6-pin SC-70 (SC-88\/SOT-363) package. It operates from 1.65 V to 5.5 V with 3-7 Ohm typical on-resistance at 4.5 V, rail-to-rail signal handling, break-before-make switching, and 250 MHz -3 dB bandwidth. The select pin (S) chooses […]<\/p>\n","protected":false},"author":2,"featured_media":2263,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[144],"class_list":["post-2069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-on"],"acf":{"brief_explanation":"SPDT analog switch\/mux, 1.65-5.5V, 3-7Ohm Ron, 250MHz BW, break-before-make, SC-70-6, T&R","date_code":"","package_case":"SC-70-6 \/ SC-88 \/ SOT-363 (2.0 x 1.25 x 0.95 mm, 0.65mm pitch)","in_stock":0,"datasheet":"https:\/\/www.onsemi.com\/pub\/Collateral\/NC7SB3157-D.PDF","price":"$0.13 (1K+ pcs)","product_introduction":"The NC7SB3157 from onsemi's TinyLogic family (originally Fairchild, also sold as FSA3157) is a single-pole\/double-throw (SPDT) analog switch that functions as a 2:1 multiplexer or 1:2 demultiplexer. The NC7SB3157P6X is the SC-70-6 tape-and-reel version with 3000 units per reel.\n\nThe device routes the common port A to either B0 or B1 based on the select (S) pin logic level. When S is LOW, A connects to B0; when S is HIGH, A connects to B1. The break-before-make circuitry ensures both switches are never simultaneously on during a select transition, preventing momentary short circuits between B0 and B1.\n\nThe 3 Ohm typical on-resistance at 4.5 V (7 Ohm max) introduces minimal voltage drop and signal distortion. Rail-to-rail signal handling allows the switch to pass analog signals from 0 V to VCC without clipping. The 250 MHz -3 dB bandwidth supports high-speed digital and video signal routing.\n\nThe device operates from 1.65 V to 5.5 V, covering all common logic voltages (1.8 V, 2.5 V, 3.3 V, 5 V). The control input tolerates voltages up to 7 V independently of VCC, enabling 5 V control signals in 3.3 V systems without level translation.\n\nPower-down high-impedance on all I\/O pins prevents backflow current when VCC is 0 V, supporting hot-swap and partial-power applications. The off-state leakage current is only 0.05 uA typical (1 uA max), ensuring minimal signal coupling in the off state.\n\nNote: The NC7SB3157P6X-F40 variant (with -F40 suffix) has been marked obsolete by DigiKey. The base NC7SB3157P6X may still be available from other distributors. The FSA3157P6X is the same device from the Fairchild product line and may be used as a cross-reference.","working_principle":"**CMOS Transmission Gate Switch:** Each switch path (A-B0, A-B1) uses a CMOS transmission gate (parallel NMOS + PMOS). The NMOS passes signals near VCC well, while the PMOS passes signals near GND well. Together, they provide rail-to-rail signal handling with relatively flat on-resistance across the full voltage range.\n\n**Break-Before-Make:** During a select pin transition, the currently-on switch opens before the new switch closes. This prevents a momentary low-impedance path between B0 and B1 that could cause current spikes or signal glitches. The break-before-make delay is built into the internal control logic.\n\n**Select Logic:** The S pin controls which switch is on. S = LOW: A-B0 connected, A-B1 open. S = HIGH: A-B1 connected, A-B0 open. The select pin has CMOS input thresholds (0.7 VCC for VIH, 0.3 VCC for VIL at 2.3-5.5 V) and tolerates voltages up to 7 V regardless of VCC.\n\n**Over-Voltage Tolerance:** When VCC is 0 V, all I\/O pins enter a high-impedance state, preventing any current path between ports or into the supply. This enables hot-swap and live-insertion applications where cards may be plugged into powered systems.","pin_description":"
| Pin<\/th> | Name<\/th> | Type<\/th> | Description<\/th><\/tr><\/thead> | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | B1<\/td> | I\/O<\/td> | Switch port B1; bidirectional; connects to A when S=HIGH; high-Z when S=LOW; rail-to-rail signal (0 to VCC); 7Ohm max Ron@4.5V<\/td><\/tr> | ||||||||||||||||||||||||||||
| 2<\/td> | A<\/td> | I\/O<\/td> | Common port; bidirectional; connects to B0 or B1 depending on S; rail-to-rail signal; primary signal routing port<\/td><\/tr> | ||||||||||||||||||||||||||||
| 3<\/td> | GND<\/td> | G<\/td> | Ground; connect to PCB ground plane; bypass VCC with 0.1uF to GND<\/td><\/tr> | ||||||||||||||||||||||||||||
| 4<\/td> | B0<\/td> | I\/O<\/td> | Switch port B0; bidirectional; connects to A when S=LOW; high-Z when S=HIGH; rail-to-rail signal<\/td><\/tr> | ||||||||||||||||||||||||||||
| 5<\/td> | S<\/td> | I<\/td> | Select input; LOW = A connected to B0; HIGH = A connected to B1; 7V over-voltage tolerant; CMOS input levels; must not float<\/td><\/tr> | ||||||||||||||||||||||||||||
| 6<\/td> | VCC<\/td> | P<\/td> | Supply voltage; 1.65V to 5.5V; bypass with 0.1uF ceramic to GND; determines signal range (0 to VCC)<\/td><\/tr><\/tbody><\/table>","application_scenarios":"
|