DG309DJ - Quad SPST Analog Switch | Maxim Integrated
Référence : DG309DJ ✓ ActifDG309DJ Présentation
An analog switch is an electronic routing component that connects or isolates signal paths under digital control. Its broader hierarchy is CMOS analog switch, analog multiplexer or demultiplexer, interface IC, and semiconductor. Unlike a mechanical relay, the DG309DJ changes the connected state electronically and is intended for signal-routing functions in communication, guidance, control, display, radio, sample-and-hold, and test-equipment systems.
The four independent circuits provide an economical way to route multiple analog signals in one package. The 100 ohm maximum on-resistance is suitable for applications where the source and load impedance do not demand exceptionally low insertion resistance. Fast switching behavior helps minimize transition time when control signals change. CMOS-compatible control inputs simplify interfacing with digital logic, while the package's through-hole PDIP-16 format supports conventional PCB assembly and prototype rework.
The DG309 family supports split supplies from ±5 V to ±20 V and a single positive supply from +5 V to +30 V, according to the manufacturer product page. This operating range allows the device to be used in both dual-rail analog circuits and higher-voltage single-rail systems. Exact device ratings, switch logic levels, leakage currents, switching times, and temperature limits should be checked against the manufacturer datasheet before final circuit design.
Typical uses include signal multiplexing in communication equipment, channel selection in guidance and control systems, source selection for heads-up displays, routing in military radios, sample-and-hold circuits, and general-purpose test equipment. The normally closed state can also support signal bypassing, redundant routing, or fail-safe paths where continuity is preferred when control power is absent.
Designers should account for the switch's on-resistance, off leakage, charge injection, control-logic levels, and supply voltage when calculating signal integrity. Keep analog traces short, connect decoupling capacitors close to the supply pins, and verify that the control signals meet the device's CMOS-compatible input thresholds. These practices reduce loading, switching transients, and unintended coupling between routed channels.
This product page combines the DG309DJ architecture, supply-range information, package details, application guidance, and replacement considerations into a design-focused guide. It helps engineers identify the correct normally closed function, verify the 16-pin footprint, and distinguish it from normally open, multiplexer, and different-package alternatives before beginning PCB or firmware work.
Alternatives de remplacement direct pour DG309DJ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
DG309DJ+
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
DG309DJ Valeurs maximales et caractéristiques électriques
| Number of Circuits | 4 circuits |
| Switch Configuration | 4 x SPST, normally closed |
| Signal-to-Channel Ratio | 1:1 |
| On-Resistance | 100 ohm maximum |
| Technology | CMOS |
| Package Type | PDIP-16 |
| Number of Terminals | 16 terminals |
| Type de montage | Through-hole |
| Package Shape | Rectangular |
| Temperature Grade | Industrial |
| Positive Supply Range | +5 V to +30 V |
| Split Supply Range | ±5 V to ±20 V |
| Control Input Compatibility | CMOS-logic-compatible |
| Switching Speed | Fast switching speed; exact timing not stated |
Guide de configuration des broches du DG309DJ rectangular
Configuration des broches du DG309DJ (boîtier rectangular). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour DG309DJ.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
DG309DJ convient pour 6 applications: Communication Signal Routing, Sample-and-Hold Signal Paths, Test Equipment Signal Selection, Military Radio Signal Routing, Heads-Up Display Source Selection, Guidance and Control Systems.
Communication Signal Routing
The DG309DJ suits communication systems that require several analog paths to remain connected until a control signal changes their state. Its four independent normally closed SPST circuits allow transmit, receive, monitor, or test routes to be isolated selectively under digital control. The 1:1 configuration avoids adding channel multiplexing complexity, while CMOS-compatible control inputs simplify interfacing with logic. Because the maximum on-resistance is 100 ohm, source and load impedances should be checked before treating the switch as a transparent connection. The device also supports +5 V to +30 V single supplies or ±5 V to ±20 V split supplies, allowing integration into higher-voltage communication equipment where a conventional 5 V-only interface would be insufficient.
Recommandé
Sample-and-Hold Signal Paths
The DG309DJ can implement controlled routing around sample-and-hold circuits by connecting or isolating the sampled signal through normally closed SPST paths. The default closed state helps preserve signal continuity until the timing controller commands a change, and the four independent channels can route more than one related analog node. The 100 ohm maximum on-resistance must be included in the acquisition-path design because it can interact with the sampling network and source impedance. CMOS-compatible control inputs are useful when the timing signals originate from digital control logic. Before implementation, verify switching time, charge injection, off leakage, and the allowable signal swing against the acquisition accuracy required by the system.
Recommandé
Test Equipment Signal Selection
The DG309DJ is suitable for test equipment that must connect instrument signals to different circuit nodes without adding a mechanical relay. Four normally closed channels provide repeatable electronic routing, while fast switching behavior helps reduce settling intervals during automated test sequences. The 100 ohm maximum on-resistance is acceptable when the instrument and measured circuit have suitably high impedance, but it can reduce signal amplitude in low-impedance paths. Use the single +5 V to +30 V supply option where higher-level signals are present, or ±5 V to ±20 V split supplies for bipolar routing. Grounding and decoupling practices remain important because repeated channel switching can couple transients into adjacent measurement paths.
Recommandé
Military Radio Signal Routing
The DG309DJ can route multiple analog signals in military radio equipment when independent, normally closed paths are preferred. Its four SPST circuits allow operators or control logic to select receive, monitor, bypass, or auxiliary signal routes without relying on slower mechanical switching. The family supports both split supplies of ±5 V to ±20 V and single positive supplies of +5 V to +30 V, which accommodates radio signal-chain voltages that may exceed basic logic levels. CMOS-compatible control inputs simplify connection to digital control hardware. For rugged equipment, verify the exact temperature range, ESD capability, supply limits, and reliability qualifications in the manufacturer documentation before incorporating the part into a production design.
Recommandé
Heads-Up Display Source Selection
The DG309DJ can manage source selection in heads-up display systems where multiple analog signals must be switched among display-related circuits. Four independent normally closed paths provide fail-closed or bypass behavior that can be useful where retaining the current route is safer during transitions. The 100 ohm maximum on-resistance is relevant when driving lower-impedance display inputs and should be included in the signal-chain design. Because the DG309 family supports both split and single positive supplies, it can be used in systems where the switched signal level differs from the digital control level. Proper decoupling, short analog routing, and defined control states are essential for preventing visible artifacts, channel transients, or unintended coupling during display updates.
Recommandé
Guidance and Control Systems
The DG309DJ fits guidance and control systems that require several normally closed analog connections to be maintained until deliberate state changes occur. Independent SPST channels can route sensor, feedback, or reference signals while retaining a defined default condition. The 100 ohm maximum on-resistance must be compatible with the driven input impedance, particularly for position-feedback and low-level control paths. CMOS-compatible controls permit straightforward use with digital logic, and the broad supply options cover both bipolar analog systems and higher single-rail voltages. In safety- or mission-critical equipment, treat the normally closed topology as one part of the fault analysis rather than assuming it guarantees safety; validate control defaults, power-loss behavior, switching transients, and all operating limits in the final system.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour DG309DJ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | DG309DJ+ |
|---|---|---|
| Package | PDIP-16 | PDIP-16 |
| Brand | Maxim Integrated | Maxim Integrated |
| Number of Circuits | 4 circuits | 4 circuits |
| Switch Configuration | SPST, normally closed | SPST, normally closed |
| Signal-to-Channel Ratio | 1:1 | 1:1 |
| On-Resistance | 100 ohm maximum | 100 ohm maximum |
| Technology | CMOS | CMOS |
| Single-Supply Range | +5 V to +30 V | +5 V to +30 V |
| Split-Supply Range | ±5 V to ±20 V | ±5 V to ±20 V |
| Temperature Grade | Industrial | Industrial |
Principaux différenciateurs
- Normally closed four-channel routing (vs DG308AJ)
- Broad supply configuration support (vs DG309DJ+)
- Four independent analog paths in one package (vs DG309CJ)
Notes de conception
Include the 100 ohm maximum on-resistance in the complete signal-path calculation. The effective source impedance, switch resistance, load impedance, and any input capacitance determine attenuation and switching settling. Keep analog traces short and use a receiver or buffer when the switched signal is high impedance or when the required settling time is short.
Place the supply bypass capacitor close to the device's supply connection and provide a low-impedance ground return. Route control inputs away from sensitive analog nets where practical. Because the DIP package offers generous lead spacing, use clean routing and guard spacing to reduce parasitic coupling, particularly when four channels switch simultaneously in test or control systems.
Do not treat the DG309 and DG308A families as interchangeable default-state devices. The DG309 is normally closed, while the DG308A is normally open. Confirm control polarity, input logic thresholds, switched signal limits, and power-loss behavior in the manufacturer datasheet. Also avoid using the 100 ohm on-resistance as a universal guarantee for every load.
Select the supply configuration according to the signal being routed. The DG309 family supports +5 V to +30 V single supplies and ±5 V to ±20 V split supplies. Do not assume that the supply range also defines every allowable input or output signal voltage; check the absolute maximum ratings and electrical characteristics for the exact ordering option before applying power.
Informations de conformité
The manufacturer product page identifies the DG309 family as production and lists industrial-grade ordering information, but the accessible product information does not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because this is an analog interface IC rather than an automotive-qualified device in the listed documentation.
