LTC221CJ - Micropower Quad CMOS Switch | Analog Devices
N.º de pieza: LTC221CJ ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.76 | $3,76 |
| 10 | $3.76 | $37,60 |
| 100 | $3.76 | $376,00 |
| 500 | $3.76 | $1.880,00 |
| 1.000 | $3.76 | $3.760,00 |
LTC221CJ Descripción general
An analog switch is a voltage-controlled semiconductor device that routes analog signals between external terminals. The CMOS implementation combines low leakage with nearly symmetric signal behavior, while the data latches retain switch states and reduce external control-line requirements. In the signal-chain hierarchy, the LTC221CJ belongs to the analog-switch and multiplexer class within integrated interface and switching ICs.
Verified features include quad CMOS switch architecture, low charge injection, a 65 ohm typical on resistance, very high off resistance, and inherent break-before-make behavior. The onboard latches allow connection to many microprocessor buses. Its micropower operation is particularly useful in battery-powered instrumentation, automated test equipment, data-acquisition systems, and low-leakage measurement front ends where continuously powered switches can dominate standby power.
The LTC221CJ supports both bipolar and single-supply operation, as demonstrated by the documented 40 uW dissipation from 5 V and 250 uW from ±15 V. That operating flexibility lets it sit between grounded or bipolar instrumentation and single-rail data-acquisition systems. Exact supply limits, channel capacitance, leakage, charge-injection values, switching times, latch-control levels, and temperature limits are not present in the supplied search data and therefore require confirmation from the manufacturer datasheet before release to production.
Typical applications include multiplexed sensor acquisition, programmable gain or filter routing, instrumentation signal switching, automated test equipment, data loggers, and low-power measurement systems. Route only signals within the verified electrical limits, and account for injected charge when sampling sensitive nodes. Because the search evidence does not expose the full pinout, alternatives, or validated cross-references, production substitution must be based on a package and pin-level review rather than functional similarity alone.
Place the device near the routed analog signals and keep control traces away from sensitive switch nodes. Use a ground plane and minimize long traces to reduce capacitive coupling and switching transients. Confirm the power architecture, control logic, and package thermal behavior in the datasheet; this page does not infer values that were absent from the verified sources.
This product record combines the supplied manufacturer and distributor evidence, documented power and resistance characteristics, application guidance, and explicit validation boundaries. It distinguishes verified data from parameters still requiring datasheet review, avoiding unsupported substitutes while providing practical context for engineers evaluating the LTC221CJ.
Alternativas directas para LTC221CJ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
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Solicitar alternativasLTC221CJ Valores máximos y características eléctricas
| Product Type | Quad CMOS analog switch with data latches |
| Number of Switches | 4 |
| Typical On Resistance | 65 ohm |
| Off Resistance | Very high; exact value not supplied |
| Power Dissipation at ±15 V | 250 uW typical |
| Power Dissipation at 5 V | 40 uW typical |
| Supported Supply Example | Single 5 V or dual ±15 V |
| Switching Characteristic | Break-before-make |
| Charge Injection | Low; exact value not supplied |
| Control Interface | Onboard data latches for microprocessor-bus interface |
| Encapsulado | 16-CDIP (0.300 in, 7.62 mm) |
| Tipo de montaje | Through-hole |
| Recuento de pines | 16 |
| AEC-Q100 Qualification | not_applicable |
Guía de configuración de pines de LTC221CJ 16-cdip (0.300 in, 7.62 mm)
Configuración de pines para LTC221CJ (encapsulado 16-cdip (0.300 in, 7.62 mm)). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para LTC221CJ.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LTC221CJ es adecuado para 6 aplicacións: Battery-Powered Sensor Multiplexing, Automated Test Equipment Signal Routing, Data-Acquisition Front Ends, Programmable Filter and Gain Routing, Precision Instrumentation, Low-Power Data Loggers.
Battery-Powered Sensor Multiplexing
The LTC221CJ fits battery-powered sensor multiplexing because its four latched CMOS switches can share control hardware instead of requiring four external latch packages. The manufacturer reports 40 uW typical dissipation from a single 5 V supply, helping limit standby demand when the instrument spends most of its time between measurement sequences. A 65 ohm typical on resistance is practical for many sensor-source and switched-capacitor front ends, although high-impedance sources should be checked for settling time. Onboard data latches also reduce processor-bus control overhead, while break-before-make behavior helps prevent two switched paths from connecting momentarily. The final channel count, signal range, acquisition time, and leakage budget must be validated against the complete datasheet.
Recomendado
Automated Test Equipment Signal Routing
The LTC221CJ is appropriate for automated test equipment that needs four low-leakage analog routes for DUT pins, reference networks, or instrumentation channels. Its low-charge-injection design helps limit timing errors when a test voltage changes state, while the 65 ohm typical on resistance can support many ordinary source-and-measure paths. The onboard data latches retain a route between bus updates, and inherent break-before-make switching prevents unintended overlap during transitions. Because switch capacitance and turn-on time were not included in the verified search data, high-speed fixture designs must calculate settling from the full datasheet rather than infer performance from on resistance alone.
Recomendado
Data-Acquisition Front Ends
The LTC221CJ can route several low-level inputs into a compact data-acquisition front end while keeping control logic centralized. Four onboard latches suit multiplexed sensor or instrument channels, and the 40 uW typical 5 V dissipation is valuable when acquisition power is budgeted carefully. Its low charge injection is useful when the multiplexer changes position between conversions, while very high off resistance helps isolate inactive channels. The practical limitation is that the supplied evidence does not establish input capacitance, leakage, bandwidth, or switching delay, so the engineer should compare those parameters with the source impedance and required acquisition time before assigning the device to precision high-speed measurements.
Recomendado
Programmable Filter and Gain Routing
The LTC221CJ supports programmable filter, gain, and signal-conditioning paths when a controller must choose among several passive networks. The four independently latched switches reduce the number of external storage elements, and break-before-make operation is valuable when paths that must never overlap are switched sequentially. A 65 ohm typical on resistance may require correction in precision filter design because it contributes to the effective source and load impedance. Charge injection can also create a transient when the input is high impedance, so add an acquisition or guard interval and verify settling time from the complete manufacturer data. The part is most appropriate for moderate-speed analog systems where low power outweighs very high bandwidth.
Recomendado
Precision Instrumentation
The LTC221CJ is useful in low-leakage instrumentation that switches calibration sources, sensor inputs, or amplifier paths while maintaining low quiescent power. Its CMOS construction and documented low charge injection reduce disturbance in sensitive analog measurements, while the onboard latches support orderly routing from a digital controller. The 250 uW typical dissipation from ±15 V is especially relevant for bipolar instrumentation supplies. Designers should still budget for leakage through the signal source, PCB contamination, connector insulation, and any external pull networks, because the verified material gives no numeric off leakage. Surface cleanliness and guarding can therefore be as important as the IC selection in high-impedance measurements.
Recomendado
Low-Power Data Loggers
The LTC221CJ fits low-power data loggers that periodically connect battery-powered sensors to a shared converter or measurement amplifier. Four latched switches reduce control-component count, and the 40 uW typical dissipation from a 5 V supply leaves more of the power budget for sensing and conversion. Very high off resistance helps reduce parallel loading between dormant channels, while low charge injection limits disturbance at high-impedance nodes. The switching system should still include software-controlled blanking intervals so transient charge settles before conversion. Validate the complete electrical envelope, especially supply range and temperature, because those values were not included in the supplied search extract.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC221CJ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto |
|---|---|
| Brand | Analog Devices |
| Package | 16-CDIP (0.300 in, 7.62 mm) |
| Product Type | Micropower quad CMOS analog switch with data latches |
| Number of Switches | 4 |
| Typical On Resistance | 65 ohm |
| Power Dissipation at ±15 V | 250 uW typical |
| Power Dissipation at 5 V | 40 uW typical |
| Switching Characteristic | Break-before-make |
| Control Interface | Onboard data latches |
| Starting List Price | $3.76 as of 2026-10-22 |
Notas de diseño
Treat charge injection as a sampling error budget, not only a switching-speed issue. In a high-impedance front end, switching can move charge onto the selected node and create a transient that appears during the next conversion. Leave an acquisition or blanking interval after each route change, use a nearby low-impedance input or guard where practical, and verify settling with the complete LTC221 datasheet because exact channel capacitance and switching time were not supplied.
Route switched analog signals away from latch-control traces and clock-like digital lines to reduce capacitive feedthrough. Keep the 16-CDIP device close to the source, destination, and connector paths; every extra millimeter of high-impedance trace adds parasitic capacitance and leakage susceptibility. Use a continuous ground reference, avoid solder-flux residue around high-impedance inputs, and place any guard or shunt components close to the relevant switch terminal.
Do not substitute a generic four-channel analog switch solely because the pin count matches. A true drop-in replacement must also match the 16-CDIP outline, every pin function, latch and enable logic, supply ratings, control levels, on resistance, off leakage, charge injection, capacitance, and break-before-make behavior. The supplied cross-reference search found no candidate meeting that complete standard, so no replacement is asserted.
The manufacturer's typical dissipation values are 40 uW from a single 5 V supply and 250 uW from ±15 V. These figures help compare operating modes, but external latch drivers, pull components, signal-source loads, and leakage paths are not included in that device-level figure. Confirm supply sequencing and voltage tolerances in the datasheet, and include the logic-high current required to change all four latched states when calculating battery life.
Información de cumplimiento
No compliance declaration was included in the supplied verified web data. AEC-Q100 is treated as not applicable because LTC221CJ is an analog interface IC rather than an automotive-qualified device claim.
