DG403CJ+ - Dual High-Speed SPDT Analog Switch | Analog Devices
N.º de pieza: DG403CJ+ ✓ ActivoDG403CJ+ Descripción general
An analog switch is an integrated semiconductor device that routes a signal between circuit nodes using controlled electrical resistance. The SPDT, or single-pole double-throw, topology connects one common terminal to one of two selectable terminals. As a dual analog switch, the DG403CJ+ contains two such channels, allowing a system to select among two signal paths for each switch. It belongs to the broader analog switch and multiplexer IC category within signal-chain semiconductors.
Key characteristics include 20 ohm typical on-resistance, maximum on-resistance matching of 2 ohm, and maximum on-resistance flatness of 3 ohm across the signal range. The redesigned switch conducts equally well in either signal direction and provides guaranteed charge injection of no more than 15 pC. Its improved matching and flatness reduce gain variation when the selected source changes, while low charge injection limits transient errors in precision sampling systems.
The DG403 family uses a low-voltage on-resistance architecture that is designed for bidirectional signal conduction. This makes the device appropriate for both source and destination switching positions. The dual-channel organization can implement a two-to-one analog multiplexer, a two-input selection network, or two independent SPDT paths when suitable control logic drives the select inputs. Designers should still account for control-logic levels, input voltage limits, and off-impedance behavior when integrating the switch with external circuitry.
Typical uses include precision test and measurement systems, data-acquisition front ends, audio routing, communication equipment, and instrumentation in which two signals must be selected with limited insertion loss. Because the part is available in a through-hole 16-pin DIP package, it is also practical for legacy boards, prototype systems, repair assemblies, and industrial equipment where surface-mount conversion would require PCB changes.
The principal design consideration is ensuring that signal amplitudes, supply rails, and logic thresholds remain within the operating limits defined by the manufacturer. Keep routing short to reduce parasitic capacitance, connect supply bypassing close to the device, and use a consistent ground reference between the switch and downstream circuitry. Adequate decoupling is especially important when the switch handles high-impedance sources or sampling networks sensitive to charge injection.
This product page combines the manufacturer's functional description with practical switching, layout, and selection guidance. It also distinguishes genuine same-footprint family options from devices with incompatible multiplexer topologies, helping engineers avoid substitutions that fit electrically but require a different pin configuration or system architecture.
Alternativas directas para DG403CJ+ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
DG403CJ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG403EJ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG403EJ+
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG403CJ+ Valores máximos y características eléctricas
| Product Type | Dual high-speed SPDT analog switch |
| Number of Circuits | 2 circuits |
| Switch Configuration | 2:1 SPDT per channel |
| Number of Channels | 2 channels |
| On-Resistance | 45 ohm nominal |
| Typical On-Resistance | 20 ohm |
| Maximum On-Resistance Matching | 2 ohm |
| Maximum On-Resistance Flatness | 3 ohm across the signal range |
| Positive Supply Voltage Range | 10 V to 30 V |
| Bipolar Supply Voltage Range | -4.5 V to +20 V |
| Maximum Charge Injection | 15 pC |
| Encapsulado | 16-pin plastic DIP |
| Tipo de montaje | Through-hole |
| Signal Conduction Direction | Bidirectional |
| Temperature Grade | Commercial |
| Estado del ciclo de vida | Production |
Guía de configuración de pines de DG403CJ+ 16-pin plastic dip
Configuración de pines para DG403CJ+ (encapsulado 16-pin plastic dip). 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 DG403CJ+.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
DG403CJ+ es adecuado para 6 aplicacións: Precision Data-Acquisition Front Ends, Two-Input Signal Multiplexing, Audio Signal Routing, Test and Measurement Equipment, Industrial Control Signal Selection, Legacy Through-Hole Circuit Repair.
Precision Data-Acquisition Front Ends
The DG403CJ+ is appropriate for selecting between two sensor or conditioning paths in a precision data-acquisition front end. Its two independent SPDT channels can implement a 2:1 multiplexer, while the 2 ohm maximum on-resistance matching and 3 ohm maximum flatness limit path-dependent gain variation. The 45 ohm nominal on-resistance and 20 ohm typical value are low enough for many moderate-impedance sensor networks. Designers should still include the source impedance in the settling analysis because switch resistance combines with input capacitance to determine acquisition time. The 15 pC maximum charge-injection figure is also important when the selected source feeds a sampling capacitor.
Recomendado
Two-Input Signal Multiplexing
The DG403CJ+ can combine two signal sources into one downstream channel by using an SPDT common terminal and the two selectable terminals of one switch section. This arrangement is useful when a measurement system must alternate between a reference and a live input. The family's guaranteed on-resistance matching of 2 ohm reduces channel-dependent insertion-loss variation, while flatness within 3 ohm helps maintain response across the operating signal range. In high-impedance instrumentation, verify the leakage and off-impedance specifications because those parameters can dominate error even when the on-resistance target is met.
Recomendado
Audio Signal Routing
The DG403CJ+ can route two audio channels through a common analog path when the circuit does not require simultaneous conduction. Its 20 ohm typical on-resistance provides a practical insertion-loss trade-off for medium- and high-impedance sources, while the 2 ohm maximum matching helps limit level differences between choices. Bidirectional conduction allows the device to be placed on either side of a source or destination. The designer should confirm bandwidth, distortion, off-leakage, and logic compatibility against the audio signal level, and should keep traces short to minimize added pickup and capacitance.
Recomendado
Test and Measurement Equipment
The DG403CJ+ is well suited to test and measurement equipment that must select between DUT, reference, or calibration signals. Two SPDT channels provide independent routing without introducing a different multiplexer topology, and the guaranteed matching and flatness of the on-resistance support predictable channel calibration. Through-hole DIP construction also simplifies installation in legacy instruments and laboratory fixtures. For high-accuracy measurements, characterize leakage, charge injection, settling time, and input capacitance; for wideband signals, verify the manufacturer's bandwidth limits before selecting the switch.
Recomendado
Industrial Control Signal Selection
The DG403CJ+ can select between two control or sensor signals in industrial equipment when the system requires a simple SPDT routing function. The commercial-temperature DG403CJ+ configuration is suited to systems whose operating environment falls within its rating, while the 16-pin DIP package is practical for repair and legacy through-hole boards. Designers must ensure that all switched nodes remain within the device's signal-voltage limits and that the control logic meets the required thresholds. Industrial systems should also account for surge, transient, and temperature effects at the board level rather than assuming the switch alone provides protection.
Recomendado
Legacy Through-Hole Circuit Repair
The 16-pin plastic DIP package makes the DG403CJ+ practical for repairing or updating through-hole analog-routing boards without introducing a surface-mount conversion. A replacement should be checked against the original schematic for common-terminal orientation, select-input polarity, supply rails, and signal limits. The DG403 family offers commercial and extended-temperature ordering options, but the replacement grade must satisfy the original equipment's environmental requirements. After installation, inspect for socket or solder contamination and verify that supply bypassing and grounding match the manufacturer's reference layout.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para DG403CJ+ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | DG403CJ | DG403EJ | DG403EJ+ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 16-pin plastic DIP | 16-pin plastic DIP | 16-pin plastic DIP | 16-pin plastic DIP |
| Switch Configuration | Dual 2:1 SPDT | Dual 2:1 SPDT | Dual 2:1 SPDT | Dual 2:1 SPDT |
| Number of Channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Nominal On-Resistance | 45 ohm | 45 ohm | 45 ohm | 45 ohm |
| Typical On-Resistance | 20 ohm | 20 ohm | 20 ohm | 20 ohm |
| Maximum Charge Injection | 15 pC | 15 pC | 15 pC | 15 pC |
| Positive Supply Range | 10 V to 30 V | 10 V to 30 V | 10 V to 30 V | 10 V to 30 V |
| Temperature Grade | Commercial | Commercial | Extended temperature | Extended temperature |
| On-Resistance Matching | 2 ohm maximum | 2 ohm maximum | 2 ohm maximum | 2 ohm maximum |
Diferenciadores clave
- Dual SPDT routing in one package (frente a DG409DJ)
- Guaranteed on-resistance matching (frente a DG403CJ)
- Commercial and extended-temperature family choices (frente a DG403EJ+)
Notas de diseño
Follow the manufacturer's reference layout and place the required bypass capacitor adjacent to the supply and ground connections. Keep common-terminal and switched-terminal traces short, especially when driving a capacitive sampling network. Excess trace length adds parasitic capacitance that can slow settling and increase the impact of charge injection. Maintain a continuous ground reference beneath the routing area and avoid switching high-current digital traces beneath sensitive analog nets.
Calculate the worst-case source impedance, switch resistance, input capacitance, and leakage path together. The 45 ohm nominal on-resistance and 20 ohm typical on-resistance can create substantial divider attenuation when the source impedance is high, while input capacitance can slow transitions after a selection change. Confirm the device bandwidth against the highest signal frequency and avoid assuming that low on-resistance alone guarantees accurate settling.
Do not treat a 4:1 multiplexer as a substitute for this dual SPDT switch. The DG408DJ and DG409DJ options use different signal topologies and are not drop-in replacements for the DG403CJ+ footprint. When substituting a family member, verify pin functions, supply range, logic thresholds, signal limits, temperature grade, leakage, bandwidth, and charge injection against the original circuit before production use.
Route the two select inputs away from sensitive switched nodes and use a stable ground reference for control signals. If the switch handles low-level signals, minimize loop area around the common terminal and preserve symmetry between the two selectable paths. Include the switch's off leakage and input capacitance when evaluating noise or settling, and maintain clearance from switching nodes carrying large fast transients.
Información de cumplimiento
The manufacturer identifies the DG403 family as a production product. No explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals statement was established for this exact ordering variant.
