DG403CY+ - Dual High-Speed SPDT Analog Switch | Analog Devices
N.º de pieza: DG403CY+ ✓ ActivoDG403CY+ Descripción general
An analog switch is a semiconductor device that routes an analog signal between circuit nodes under digital control. Unlike a mechanical relay, it provides faster switching and compact solid-state construction. The DG403 belongs to the SPDT switch hierarchy: each of its two channels connects one common terminal to one of two switched terminals, allowing a source to select between two destinations. This makes the device suitable for test equipment, signal-chain routing, instrumentation, and data-acquisition systems.
Key characteristics include a maximum on-resistance of 45 ohms, guaranteed on-resistance matching of 2 ohms maximum, guaranteed on-resistance flatness of 3 ohms maximum, and charge injection of 15 pC maximum. The redesigned DG403 family also provides low off leakage below 5 nA at +85°C. These characteristics help limit signal attenuation, channel-to-channel resistance variation, transient switching errors, and leakage into sensitive measurement nodes.
The DG403CY+ uses independent control inputs to operate its two SPDT channels, with operation supported by positive and negative supply rails. Equal on-resistance in both directions makes the switch useful for bidirectional paths, including instrumentation, automated test, data acquisition, and signal-conditioning systems. The 16-pin NSOIC package supports conventional surface-mount PCB assembly, while its two-channel architecture reduces the number of discrete switches required for dual-path routing.
Typical applications include multiplexed sensor acquisition, oscilloscope and measurement-instrument signal routing, automated test equipment, sample-and-hold systems, and industrial control modules. The low charge-injection specification is particularly useful when the switched node feeds a high-impedance amplifier because it limits the control-induced voltage transient that could otherwise disturb a measurement.
When laying out a board, keep the common and switched signal traces short, provide a low-impedance return path, and place supply-bypass capacitors near the device. Avoid routing high-impedance signals beside digital control traces, and account for the 45-ohm maximum on-resistance when designing voltage dividers, termination networks, or gain stages. Verify the exact pin mapping and recommended application circuit in the Analog Devices DG403 data sheet before layout release.
This page combines manufacturer specifications, replacement guidance, application analysis, and practical implementation notes. It also distinguishes same-footprint upgrades from cross-package options so engineers can identify realistic drop-in choices without treating every functionally similar switch as a direct replacement.
Alternativas directas para DG403CY+ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con DG403CY+ (mismo factor de forma y huella) — difiere en Off Leakage Current, On-Resistance Flatness, On-Resistance Matching, Package, Charge Injection.
DG403DY+
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →DG403DY
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG403DYZ+
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG403DJ+
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →DG403CY+ Valores máximos y características eléctricas
| Number of Switch Channels | 2 channels |
| Switch Architecture | 2 x SPDT |
| Maximum On-Resistance | 45 ohm |
| Typical On-Resistance | 20 ohm |
| On-Resistance Matching | 2 ohm maximum |
| On-Resistance Flatness | 3 ohm maximum |
| Maximum Charge Injection | 15 pC |
| Off Leakage Current | <5 nA at +85°C |
| Positive Supply Voltage Range | 4.5 V to 20 V |
| Negative Supply Voltage Range | -20 V to -4.5 V |
| Signal Direction | Bidirectional |
| Encapsulado | 16-pin NSOIC |
| Tipo de montaje | Surface Mount |
Guía de configuración de pines de DG403CY+ 16-pin nsoic
Configuración de pines para DG403CY+ (encapsulado 16-pin nsoic). 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 DG403CY+.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
DG403CY+ es adecuado para 6 aplicacións: Automated Test Equipment Signal Routing, Data Acquisition Multiplexing, Precision Instrumentation Signal Selection, Sensor Signal Conditioning, Oscilloscope and Measurement Front Ends, Sample-and-Hold Signal Paths.
Automated Test Equipment Signal Routing
The DG403CY+ fits automated test systems that must route one measurement source to two different DUT or instrument paths. Its two independent SPDT channels provide separate routing decisions, while the 45-ohm maximum on-resistance is suitable when it is included in the measurement-path impedance budget. The 20-ohm typical resistance helps engineers estimate nominal insertion loss before selecting gain and termination values. Because the switches conduct in either direction, the same device can route stimulus and return signals. Allow settling time after each transition because the 15 pC maximum charge injection can create a transient in high-impedance nodes.
Recomendado
Data Acquisition Multiplexing
The DG403CY+ is useful in data-acquisition front ends that alternate a common measurement node between two signal sources. A 45-ohm maximum on-resistance adds a controlled series impedance that must be included when calculating the effective transfer function with sensor and amplifier impedances. Its bidirectional conduction supports source selection without separate direction-dependent devices. The low off leakage below 5 nA at +85°C helps reduce errors at high-impedance sensor nodes, while 15 pC maximum charge injection should be considered when sampling immediately after switching. The 16-pin NSOIC package simplifies compact, surface-mount instrument layouts.
Recomendado
Precision Instrumentation Signal Selection
The DG403CY+ supports precision instrument signal selection where one amplifier or measurement channel must connect to different input networks. Its 45-ohm maximum on-resistance and 2-ohm maximum on-resistance matching help limit insertion-loss variation between the two switched paths, while 3-ohm maximum flatness limits resistance changes over the signal range. These characteristics are important when gain calibration assumes repeatable path behavior. Place the switch close to the protected input, maintain a quiet ground reference, and allow the measurement system to settle after each transition to avoid interpreting charge injection as a real input change.
Recomendado
Sensor Signal Conditioning
The DG403CY+ can select between sensor outputs or signal-conditioning paths in compact industrial modules. Its bidirectional switching behavior is useful for resistive, bridge, or voltage-sensing networks, provided the 45-ohm maximum on-resistance is acceptable in the sensor path. The off leakage below 5 nA at +85°C limits disturbance at high-impedance nodes, and the low 15 pC maximum charge injection helps reduce control transients. Use a single ground reference across the switch and analog section, place bypass capacitors close to the supply pins, and avoid placing fast digital control traces beside sensitive sensor inputs.
Recomendado
Oscilloscope and Measurement Front Ends
The DG403CY+ is appropriate for oscilloscope-adjacent and laboratory measurement circuits requiring fast selection between two signal paths. Its dual high-speed SPDT architecture supports channel routing, probe selection, or input isolation without using separate relays for each path. The nominal 20-ohm typical on-resistance and 45-ohm maximum on-resistance should be included in probe compensation and attenuator design. The 15 pC maximum charge injection is especially relevant when the selected source drives a high-impedance vertical input. Keep signal routing short, maintain a continuous return plane, and schedule the first valid acquisition after the control transient has settled.
Recomendado
Sample-and-Hold Signal Paths
The DG403CY+ can implement signal selection in sample-and-hold systems where the input source changes between acquisition intervals. The dual SPDT arrangement allows two source paths to be prepared before the acquisition sequence, while the 45-ohm maximum on-resistance contributes to source impedance and settling behavior. Charge injection of 15 pC maximum creates a transient proportional to the switched node capacitance, so the held capacitor and sampling amplifier must be sized for adequate recovery time. The device's bidirectional conduction also permits routing in either signal direction, simplifying instrumentation around the hold stage.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para DG403CY+ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | DG403DY+ | DG403DY | DG403DYZ+ | DG403DJ |
|---|---|---|---|---|---|
| Package | 16-pin NSOIC | 16-pin NSOIC - same | 16-pin NSOIC - same | 16-pin NSOIC - same | 16-pin NSOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 2 | 2 | 2 | 2 | 2 |
| Switch Architecture | 2 x SPDT | 2 x SPDT | 2 x SPDT | 2 x SPDT | 2 x SPDT |
| Maximum On-Resistance | 45 ohm | 45 ohm | 45 ohm | 45 ohm | 45 ohm |
| Typical On-Resistance | 20 ohm | 20 ohm | 20 ohm | 20 ohm | 20 ohm |
| Maximum Charge Injection | 15 pC | 15 pC | 15 pC | 15 pC | 15 pC |
| Positive Supply Voltage Range | 4.5 V to 20 V | 4.5 V to 20 V | 4.5 V to 20 V | 4.5 V to 20 V | 4.5 V to 20 V |
| Negative Supply Voltage Range | -20 V to -4.5 V | -20 V to -4.5 V | -20 V to -4.5 V | -20 V to -4.5 V | -20 V to -4.5 V |
| Off Leakage Current | <5 nA at +85°C | <5 nA at +85°C | <5 nA at +85°C | <5 nA at +85°C | <5 nA at +85°C |
Diferenciadores clave
- Dual high-speed SPDT routing in one 16-pin package (frente a DG403DY+)
- Guaranteed channel matching supports repeatable path selection (frente a DG403DY)
- Low leakage supports high-impedance signal paths (frente a DG403DYZ+)
- Bidirectional conduction simplifies signal-path planning (frente a DG403DJ)
Notas de diseño
Route common, switched, and control traces as short as practical, and place the device near the source or protected input rather than at the edge of the PCB. Keep the analog return current within the same reference plane and avoid crossing control routes beneath high-impedance inputs. The switch conducts equally well in either direction, but short traces are still necessary to minimize parasitic inductance, capacitive pickup, and additional settling time.
Do not treat the 20-ohm typical on-resistance as a design guarantee; use the 45-ohm maximum value in voltage-divider, termination, and gain calculations. Likewise, include the 15 pC maximum charge injection when sizing the switched node capacitance or determining the settling interval for a high-impedance amplifier. Recheck polarity and supply limits because the device supports bipolar rails of 4.5 V to 20 V magnitude.
Follow the manufacturer's recommended positive and negative bypass-capacitor configuration, placing each capacitor close to its corresponding supply pin. Keep supply-return connections compact to reduce parasitic inductance and ensure that control-input levels remain valid under the selected supply combination. Decoupling does not substitute for correct rail sequencing: both rails should remain inside their specified limits throughout startup and shutdown.
For high-impedance signals, minimize board leakage and avoid placing the switch next to switching regulators or high-current return paths. Account for both off leakage below 5 nA at +85°C and the 15 pC maximum charge injection. A practical settling strategy is to change the switch state, allow the control transient to decay, and then initiate acquisition. The required delay depends on node capacitance, source impedance, amplifier bandwidth, and measurement accuracy.
Información de cumplimiento
The manufacturer product page identifies the DG403 family as production. Specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals statements were not identified for the DG403CY+ ordering code in the cited information.
