DG442DK - 85 Ohm Quad SPST Analog Switch | Maxim Integrated | 16-CDIP
N.º de pieza: DG442DK ✓ ActivoDG442DK Descripción general
What is an analog switch? An analog switch is a solid-state semiconductor device that steers analog signals between circuit nodes under digital control, with no moving contacts and near-zero off-state signal transfer. A single-pole single-throw (SPST) analog switch provides one conducting path that is opened or closed, and a quad SPST device like the DG442DK implements four such paths on one die. In the product hierarchy, an analog switch sits within analog multiplexers and demultiplexers, inside interface ICs, within the broader family of integrated circuits and semiconductors. The DG442DK is a discrete-control (no logic-enable) version, so each of the four paths is driven by its own external control signal.
Key features of the DG442DK include a maximum on-resistance of 85 ohm with on-resistance matching between switches guaranteed to 4 ohm maximum, and on-resistance flatness over the signal range guaranteed to 9 ohm maximum. The matched and flat resistance characteristics mean all four channels attenuate the same signal equally, which is what makes the device usable in balanced multi-channel paths rather than only in single-channel routing. Off-leakage current of 500 pA keeps the off state effectively open for high-impedance sources, and the switch conducts equally well in either signal direction.
The Maxim Integrated DG441/DG442 family was redesigned around improved on-resistance matching and guaranteed on-resistance flatness over the signal range, replacing older revision behavior where channel-to-channel Ron could drift more widely. Switching times of 250 ns turn-on and 170 ns turn-off place the part in the general-purpose, medium-speed class rather than the sub-10 ns RF or ultra-fast video switch categories, which keeps on-resistance and leakage low while remaining inexpensive and easy to drive from standard logic.
Typical applications include signal multiplexing in automated test and measurement equipment, audio and instrumentation channel selection, sample-and-hold and guarded-input amplifier front ends, and battery-powered sensor interface boards where the 500 pA off leakage protects the source from loading. Because the switches are independent, four different signal paths can be routed simultaneously to four different destinations.
One key design consideration is that each switch has no on-board enable logic, so control drive levels and timing are entirely set by the host logic. Because the ceramic DIP package provides long leads, it also tolerates higher applied signal voltages relative to the 15 V supply in many analog-routing applications, but the signal range must always remain inside the absolute maximum ratings given in the manufacturer datasheet.
This page consolidates package details, switching characteristics, drop-in source options and practical layout guidance for the DG442DK, adding engineering context that is not present in the raw manufacturer datasheet listings.
Alternativas directas para DG442DK — 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 DG442DK (mismo factor de forma y huella) — difiere en Package, Switch Configuration.
DG442DJ+
✅ Sustitución directaConsulte el precio
Ver hoja de datos →DG442DY+
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG442DK+
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG442DK-E3
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG442DJ-E3
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG442DK Valores máximos y características eléctricas
| Number of Switches | 4 |
| Switch Configuration | Single-Pole Single-Throw (SPST), Normally Open |
| Multiplexer Configuration | 1:1 |
| On-Resistance (RON) | 85 ohm max |
| On-Resistance Matching Between Switches | 4 ohm max |
| On-Resistance Flatness Over Signal Range | 9 ohm max |
| Off-Leakage Current | 500 pA |
| Tensión de alimentación | 15 V |
| Turn-On Time | 250 ns |
| Turn-Off Time | 170 ns |
| Encapsulado | 16-CDIP ceramic, 0.300 in (7.62 mm) lead pitch |
| Recuento de pines | 16 |
| Tipo de montaje | Through-hole |
| Signal Direction | Bidirectional (conducts equally in either direction) |
| Estado RoHS | unknown |
Guía de configuración de pines de DG442DK 16-cdip ceramic, 0.300 in (7.62 mm) lead pitch
Configuración de pines para DG442DK (encapsulado 16-cdip ceramic, 0.300 in (7.62 mm) lead pitch). 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 DG442DK.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
DG442DK es adecuado para 6 aplicacións: Automated Test Equipment Signal Multiplexing, Audio Channel Selection and Routing, Sample-and-Hold and Guarded Sensor Inputs, Battery-Powered Sensor Interface Boards, Data Acquisition and Fan-Out Systems, Process Control and Industrial Monitoring.
Automated Test Equipment Signal Multiplexing
The DG442DK suits test and measurement front ends where several instrument channels must be connected to one input. Four independent SPST paths with a maximum on-resistance of 85 ohm and guaranteed matching of 4 ohm maximum between switches keep channel-to-channel insertion loss nearly identical, which simplifies path-loss calibration tables. The 250 ns turn-on and 170 ns turn-off times are short enough to settle within typical measurement apertures, while the 500 pA off-leakage prevents an unselected high-impedance source from being loaded. In a matrix-style fixture, several DG442DK devices can be combined so that device-under-test pins connect to whichever measurement amplifier is selected, without switching the signal path itself.
Recomendado
Audio Channel Selection and Routing
In audio consoles, mixers and monitor controllers, the DG442DK can route one of four line-level inputs to a single summing amplifier. The 85 ohm maximum on-resistance is small compared with typical line-level source impedances, so insertion loss is modest, and the on-resistance flatness of 9 ohm maximum over the signal range prevents tonal imbalance across the audio bandwidth. Because the switch conducts equally in both directions, the same device handles microphone and headphone-level routing without level-dependent asymmetry. The 500 pA off leakage keeps quiet high-impedance microphone preamp inputs essentially unloaded when their channel is deselected, preserving the noise floor of the downstream converter.
Recomendado
Sample-and-Hold and Guarded Sensor Inputs
The four SPST paths of the DG442DK can connect a sensor line to the input of a sample-and-hold amplifier or guarded-input instrumentation amplifier. Turn-on of 250 ns and turn-off of 170 ns provide enough settling margin when the acquisition window is defined by a fast ADC, while the 500 pA off-leakage prevents the hold capacitor from discharging while another channel is selected. The matched on-resistance across the four switches means the acquisition front end sees essentially the same source impedance for every input, which keeps the settling time constant across the scan. For strain gauge, thermocouple and bridge sensors, the low-leakage SPST arrangement also avoids injecting bias current errors into megohm-level sources.
Recomendado
Battery-Powered Sensor Interface Boards
In portable sensor nodes and low-power acquisition boards, the DG442DK provides leakage-limited channel selection between a small number of sensors. The 500 pA off-leakage current is the key figure in this application because a quiescent leakage of that order adds negligible error to microamp-level sensor signals and does not meaningfully increase the standing current of the node. Since the switches are independent rather than multiplexed through a common enable, the host microcontroller can select one of four inputs without a shared enable line or extra address decoding. Through-hole ceramic packaging also suits ruggedised, repairable field equipment where mechanical shock and temperature variation are concerns.
Recomendado
Data Acquisition and Fan-Out Systems
The DG442DK works well as a signal fan-out element when one measurement source must reach several destinations. Because all four SPST paths are independent, a single incoming signal can be distributed to up to four destinations in parallel, each path presenting the same 85 ohm maximum on-resistance and matching the others to within 4 ohm. This keeps amplitude imbalance between the distributed outputs small, which matters when the destinations are separate converters or comparators. The 250 ns turn-on and 170 ns turn-off times also allow fast source selection in time-multiplexed acquisition systems, and the 500 pA off-leakage prevents an idle branch from loading the source.
Recomendado
Process Control and Industrial Monitoring
In industrial monitoring and process control panels, the DG442DK can select between multiple analog inputs coming from transducers and bring the selected signal to a shared transmitter or alarm comparator. The guaranteed on-resistance matching of 4 ohm maximum means calibration performed on one channel remains valid when the controller switches to another channel, avoiding recalibration after every range change. The ceramic 16-CDIP package tolerates the temperature variation and vibration typical of cabinet-mounted equipment better than a plastic DIP. Because the device is bidirectional and free of logic enables, it also supports two-wire half-duplex style routing where the same conductor pair carries traffic in either direction.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para DG442DK — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | DG442DJ+ | DG442DY+ | DG442DK+ | DG442DK-E3 | DG442DJ-E3 |
|---|---|---|---|---|---|---|
| Package | 16-CDIP ceramic (0.300 in / 7.62 mm pitch) | 16-pin plastic DIP (0.300 in / 7.62 mm pitch) - same footprint | 16-pin plastic DIP (0.300 in / 7.62 mm pitch) - same footprint | 16-CDIP ceramic (0.300 in / 7.62 mm pitch) - same | 16-CDIP ceramic (0.300 in / 7.62 mm pitch) - same | 16-pin plastic DIP (0.300 in / 7.62 mm pitch) - same footprint |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Number of Switches / Circuits | 4 | 4 | 4 | 4 | 4 | 4 |
| Switch Configuration | SPST (normally open), 1:1 | SPST (normally open), 1:1 | SPST (normally open), 1:1 | SPST (normally open), 1:1 | SPST (normally open), 1:1 | SPST (normally open), 1:1 |
| On-Resistance (RON) | 85 ohm max | 85 ohm max | 85 ohm max | 85 ohm max | 85 ohm max | 85 ohm max |
| On-Resistance Matching Between Switches | 4 ohm max | 4 ohm max | 4 ohm max | 4 ohm max | 4 ohm max | 4 ohm max |
| On-Resistance Flatness Over Signal Range | 9 ohm max | 9 ohm max | 9 ohm max | 9 ohm max | 9 ohm max | 9 ohm max |
| Off-Leakage Current | 500 pA | 500 pA | 500 pA | 500 pA | 500 pA | 500 pA |
| Turn-On / Turn-Off Time | 250 ns / 170 ns | 250 ns / 170 ns | 250 ns / 170 ns | 250 ns / 170 ns | 250 ns / 170 ns | 250 ns / 170 ns |
| Supply Voltage | 15 V | 15 V | 15 V | 15 V | 15 V | 15 V |
| RoHS / Lead-Free Status | unknown | unknown | unknown | unknown | unknown | unknown |
Diferenciadores clave
- Guaranteed channel-to-channel on-resistance matching (frente a DG442DJ+)
- Ceramic package robustness for industrial and laboratory service (frente a DG442DY+)
- Leakage-limited switching for high-impedance sources (frente a DG442DJ-E3)
- Independent SPST paths instead of multiplexed differential switching (frente a DG442DK+)
Notas de diseño
The 85 ohm maximum on-resistance is a series element in every signal path, so budget it explicitly when the source impedance is high. With a 10 kohm source and a 1 kohm load, the switch contributes roughly 8 percent extra attenuation and a phase shift that varies with signal amplitude through the 9 ohm flatness guarantee. Keep the source impedance as low as practical, or terminate the load at the switch output rather than far downstream, so the divider ratio stays predictable. Estimated values are illustrative arithmetic, not datasheet guarantees.
This is a through-hole 16-CDIP on a 0.300 inch (7.62 mm) lead pitch, so the drill pattern must match the standard DIP row spacing rather than a surface-mount land pattern. Provide adequate hole tolerance for a ceramic body with larger lead diameters than plastic, and verify the taller ceramic package height against connector and enclosure clearance. Do not combine a ceramic DIP footprint with a plastic-DIP replacement part without checking mechanical fit on the populated board.
The four SPST switches are independent and have no shared enable input, so the control logic must drive them correctly; there is no internal default state and no break-before-make behaviour to rely on during transitions. If a switch is driven while the signal source is active, the momentary glitch on the downstream node can corrupt a conversion in progress. Sequence the control lines relative to the acquisition timing, and never allow a control signal to exceed the supply rail specified in the manufacturer datasheet.
Because this is a non-logic analog switch, the supply rail is present whenever the device is connected to the system, and the off-leakage of 500 pA per switch is the parameter that dominates error in high-impedance designs rather than supply current. In battery-powered sensor nodes, leave the supply to the switch package connected only as long as the measurement needs it, and treat the leakage as part of the total input bias budget for any source above roughly 1 Mohm. Use the pin-description table in the manufacturer datasheet when assigning supply and ground pins.
Información de cumplimiento
Compliance status was not stated in the manufacturer or distributor documentation consulted for this part; confirm RoHS, REACH and lead-free status for the exact ordering suffix (DK, DK+, DY, DJ) with the manufacturer before release. AEC-Q100 does not apply to this general-purpose analog switch.
