MC14551BD - 4PDT Analog Switch, 3-18 V, 16-SOIC | onsemi
N.º de pieza: MC14551BD ✓ ActivoMC14551BD Descripción general
An analog switch is a solid-state semiconductor device that routes analog or digital signals under digital control without mechanical contacts. The MC14551BD belongs to the analog switch and multiplexer hierarchy, where a 4PDT arrangement provides four independent pole paths. This makes it useful for signal routing, channel selection, test-point isolation, and analog signal multiplexing.
The main device characteristics include a 3 V to 18 V power-supply range, low ON impedance, and very low OFF leakage current. The 16-SOIC package supports conventional surface-mount PCB assembly. The control inputs determine which signal paths are connected, while the switched terminals can handle analog signals across the operating supply range.
The MC14551B architecture is based on complementary switch elements controlled by logic-level select inputs. Low ON resistance helps minimize signal attenuation when a channel is active, while low OFF leakage helps prevent unwanted coupling between inactive channels. The device is suitable for systems requiring several analog paths to share a common interface without using mechanical relays.
Typical uses include multiplexed sensor acquisition, audio and communications routing, instrumentation signal selection, and embedded test circuits. In a measurement system, the switch can connect multiple inputs to a shared amplifier or converter, reducing the number of external analog front-end components. In a communications design, it can route controlled signals among test and operating paths.
For layout, place the device close to the signal sources and receiving circuitry to minimize trace resistance and capacitance. Keep control traces away from sensitive analog nodes where possible, and follow the datasheet pin-description table when assigning the 16-SOIC footprint. This page summarizes the principal device function, package information, sourcing structure, and practical design considerations for engineers evaluating the MC14551BD.
Alternativas directas para MC14551BD — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
MC14551BDG
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC14551BD Valores máximos y características eléctricas
| Device Type | Digitally controlled 4PDT solid-state analog switch |
| Supply Voltage Range | 3 V to 18 V |
| Switch Configuration | 4PDT |
| Number of Switched Channels | 4 channels |
| ON Impedance | 280 ohm |
| OFF Leakage Current | Very low; exact value not stated in the search result |
| Signal Voltage Range | Up to the complete supply voltage range |
| Control Type | Digital control |
| Encapsulado | 16-SOIC |
| Package Pin Count | 16 pins |
| Tipo de montaje | Surface mount |
Guía de configuración de pines de MC14551BD 16 pins
Configuración de pines para MC14551BD (encapsulado 16 pins). 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 MC14551BD.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MC14551BD es adecuado para 6 aplicacións: Multiplexed Sensor Acquisition, Audio Signal Routing, Communications Test Point Selection, Automated Test Fixture Routing, Industrial Control Signal Multiplexing, Precision Analog Signal Selection.
Multiplexed Sensor Acquisition
The MC14551BD suits sensor multiplexing because its four independently controlled 4PDT sections can route several analog inputs to a shared amplifier or converter. The 3 V to 18 V operating range supports common embedded and industrial supply levels, while the listed 280 ohm ON impedance keeps channel insertion resistance in mind. Because sensor signals may be small and high impedance, designers should verify acquisition settling time, leakage current, and the source impedance presented to each switched input before finalizing the measurement path.
Recomendado
Audio Signal Routing
The MC14551BD can route multiple low-level analog paths in audio equipment, test fixtures, and signal-selection boards. Its 4PDT arrangement provides four controlled paths, and the low ON impedance reduces attenuation compared with a higher-resistance switch network. The main design tradeoff is the finite 280 ohm ON impedance: with a typical 10 kohm input load it produces a modest divider, while substantially lower source or load impedances can create noticeable level error. Keep switched traces short and verify channel-to-channel crosstalk in the finished board.
Recomendado
Communications Test Point Selection
The MC14551BD is useful for controlled signal routing in communications and instrumentation test points, where several analog lines must be connected selectively to a measurement or interface circuit. The 16-SOIC package provides a compact implementation, and digital control allows the selected path to be changed by host logic. Designers should treat the 280 ohm ON impedance as part of the channel loss budget, confirm the signal amplitude remains within the allowed analog range, and provide adequate grounding to prevent return currents from coupling into sensitive routing traces.
Recomendado
Automated Test Fixture Routing
The MC14551BD can route DUT test nodes, reference signals, or instrumentation channels under digital control in an automated fixture. Four independent switching sections reduce the number of separate relay or wiring channels required for a compact fixture. Its solid-state implementation offers fast electronic control and compact placement, but the analog path still has finite insertion resistance and leakage. For high-current or high-voltage nodes, use a separate protection and switching structure rather than applying the MC14551BD outside its maximum ratings.
Recomendado
Industrial Control Signal Multiplexing
The MC14551BD fits industrial signal-selection circuits where multiple process-control lines must be routed to shared input electronics. Its 3 V to 18 V supply range accommodates common control-system logic levels, and the four switch sections permit compact channel selection. The design must account for the 280 ohm ON impedance and very low OFF leakage so that inactive channels do not disturb active measurements. Validate the selected input range, common-mode voltage, and fault conditions against the maximum-ratings table before deploying the switch in safety-related equipment.
Recomendado
Precision Analog Signal Selection
The MC14551BD can select among several analog sources in instrumentation and precision signal-conditioning systems. The low ON impedance helps limit channel attenuation, and very low OFF leakage helps isolate inactive paths when the selected signals are small. However, the 280 ohm figure should be treated as a design input rather than a universal constant across all supply, signal, and temperature conditions. Use short PCB traces, clean grounding, and an appropriate acquisition front end, then verify settling and channel isolation with the actual source impedances.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC14551BD — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC14551BDG |
|---|---|---|
| Package | 16-SOIC | 16-SOIC |
| Brand | onsemi | onsemi |
| Switch Configuration | 4PDT | 4-circuit analog switch |
| ON Impedance | 280 ohm | 280 ohm |
| Control Interface | Digital control | Digital control |
| Number of Pins | 16 pins | 16 pins |
Diferenciadores clave
- Four independently addressed analog paths in one 16-SOIC device (frente a Discrete single-channel analog switches)
- Low ON impedance for analog routing (frente a MC14551BDG)
- Broad control-supply operating range (frente a Single-level logic-only routing implementations)
- Signal routing across the supply range (frente a Low-voltage-only analog switches)
Notas de diseño
Route switched analog nodes as short and direct as practical because the listed 280 ohm ON impedance combines with trace resistance and the receiving circuit's input impedance. Place the MC14551BD near the source and destination devices, maintain a continuous ground reference under the package, and avoid sharing narrow return paths between active and high-impedance channels. These steps minimize added attenuation and improve repeatability in multiplexed measurement systems.
Check analog input voltage and supply headroom against the manufacturer maximum-ratings table before applying signals. The onsemi datasheet warns that a voltage drop across the switch greater than 600 mV, or greater than 300 mV at high temperature, can produce excessive VDD current containing both supply and switch-input components. Use series resistance or source-current control where the external signal could exceed the normal operating region.
Do not treat the 280 ohm ON impedance as a constant for every signal level, supply voltage, and temperature. Verify the effective resistance in the operating region, include it in the input divider and settling calculations, and confirm that source impedance is low enough to meet the acquisition-time requirement. For high-value precision signals, measure crosstalk and leakage using the actual board layout and surrounding circuitry.
Use the 16-SOIC footprint and assign every numbered terminal from the pin-description table in the manufacturer datasheet. Keep the four switching networks and their associated control inputs clearly separated in schematic review; an incorrect select-to-channel connection can leave a signal path unintentionally connected. Provide adequate decoupling at the supply pins according to the datasheet guidance and maintain uninterrupted ground returns for the analog nodes.
Información de cumplimiento
No specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was identified in the available component listings. AEC-Q100 qualification is not indicated, so the field is marked not applicable.