DG421DJ - Low-Power Latched SPST CMOS Switch | Maxim
MPN: DG421DJ ✓ פעילDG421DJ סקירה
An analog switch is a semiconductor device that connects or disconnects an electrical signal path under digital control. The DG421 belongs to the analog-switch hierarchy within interface ICs and broader signal-management semiconductors. Unlike a mechanical relay, a CMOS analog switch operates without moving contacts, enabling compact circuitry, low power consumption, and electronic control. Its latch feature allows the switching state to be retained, which is useful when downstream circuitry must retain a selected connection without continuous control-signal activity.
The redesigned DG421 series provides guaranteed matching between the two switches and controlled on-resistance flatness over the signal range. These characteristics are important in instrumentation, data acquisition, test equipment, and control systems where different switch paths should present similar resistance. The 20-ohm typical on resistance can support moderate-voltage, low-frequency signal routing, although the supplied data does not include the complete voltage, current, bandwidth, capacitance, leakage, and logic-level limits.
The DG421DJ uses a 16-pin DIP package and is identified as an industrial-temperature-grade, through-hole device. Its 16 terminals accommodate two independently controlled SPST channels, latch-related control connections, power rails, and associated pins. The verified source material confirms a 16-pin DIP package and SPST configuration, but it does not provide a complete public pin-number table. The pinout is therefore left unpopulated rather than assigning terminal functions without direct evidence.
Typical uses include multiplexed sensor acquisition, programmable test fixtures, analog signal routing, sample-and-hold systems, and industrial control equipment. In each case, the guaranteed 3-ohm maximum matching and 4-ohm maximum flatness help limit channel-to-channel errors. The DG421DJ is also suitable where a latched switch state simplifies control logic, although engineers should verify the exact electrical limits from the complete manufacturer datasheet before finalizing signal levels, clocking arrangements, and operating conditions.
This page consolidates the verified package, configuration, resistance, and sourcing information into an engineer-focused comparison and selection guide. It also distinguishes the DIP-16 DG421DJ from related suffix variants and emphasizes that a true drop-in replacement requires verified pin compatibility, not merely a similar function or shared package family.
חלופות תחליף ישיר עבור DG421DJ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
אין חלופות תואמות Drop-in עבור מוצר זה.
בקשת חלופותDG421DJ דירוגים מרביים ומאפיינים חשמליים
| Switch Configuration | Dual SPST |
| Control Type | Latch |
| Technology | Low-power CMOS |
| Typical On-Resistance | 20 ohm |
| On-Resistance Matching Between Switches | 3 ohm maximum |
| On-Resistance Flatness Over Signal Range | 4 ohm maximum |
| Conduction Direction | Bidirectional |
| Temperature Grade | Industrial |
| Number of Terminals | 16 |
| מארז | DIP-16 |
| Package Shape | Rectangular |
| סוג הרכבה | Through-hole |
| Surface Mount | No |
| Datasheet Page Count | 12 pages |
| Datasheet File Size | 132 Kbytes |
מדריך תצורת פינים של DG421DJ rectangular
תצורת פינים עבור DG421DJ (מארזת rectangular). מספרי פינים, פונקציות ותרשימי חיבורים מוגדרים ב-Datasheet של היצרן. יש לעיין בו לקבלת ה-footprint המדויק והנחיות הלחמה.
אין נתוני פריסת פינים מפורטים עבור DG421DJ.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
DG421DJ מתאים עבור 6 יישוםs: Multiplexed Sensor Acquisition, Programmable Test Fixtures, Sample-and-Hold Signal Routing, Industrial Control Signal Routing, Data Acquisition Switching, Low-Power Control Module.
Multiplexed Sensor Acquisition
The DG421DJ can route multiple sensor lines into a shared analog front end when its dual SPST topology and latched control are suitable for the system architecture. Its guaranteed on-resistance matching of 3 ohms maximum helps reduce channel-to-channel gain errors, while the 4-ohm maximum flatness limit helps maintain more uniform signal behavior over the operating range. A typical implementation would connect the two switch channels between selected sensors and a measurement amplifier or ADC input. Before finalizing the design, verify the manufacturer's input-voltage, current, bandwidth, capacitance, and leakage limits because those values are not present in the supplied search excerpts.
Programmable Test Fixtures
The DG421DJ is applicable to programmable test fixtures that require repeatable signal-path selection and a retained routing state. The latch feature can reduce the need to hold a control command continuously while the fixture remains configured. For dual-channel measurements, the 3-ohm maximum on-resistance matching provides a defined limit for path-to-path variation, and the 4-ohm maximum flatness provides a controlled signal-range specification. The DIP-16 through-hole package is useful where sockets, connectorized fixtures, or manual rework are preferred. Engineers should still check the complete datasheet for logic levels, switching time, signal bandwidth, and allowable analog voltage before using it in automated production test.
Sample-and-Hold Signal Routing
The DG421DJ can support sample-and-hold architectures where two independently selectable SPST paths connect a source to a sampling node or auxiliary instrumentation. Its 20-ohm typical on resistance adds a defined series-resistance term that must be included in source impedance and settling-time analysis. The matching and flatness guarantees support more consistent behavior between the two selected paths. A practical design would use the latch to preserve the selected connection during acquisition and would route the hold capacitor and amplifier for minimum leakage and noise pickup. Because the verified data omits charge injection, off leakage, bandwidth, and power-supply limits, those characteristics require direct review of the full Maxim Integrated datasheet.
Industrial Control Signal Routing
The DG421DJ fits industrial signal-routing modules that need two selectable SPST analog paths, electronic control, and DIP-16 through-hole construction. Its industrial temperature grade supports use in industrial equipment, although the exact numeric operating-temperature limits are not included in the supplied excerpts. The dual channels can route control or feedback signals, and the latched state can simplify system sequencing. Because the verified data confirms a 20-ohm typical on resistance rather than a complete minimum and maximum specification, engineers should evaluate source impedance, injected error, available drive current, and switching transients under worst-case conditions.
Data Acquisition Switching
The DG421DJ may be used in data-acquisition boards to connect selected analog inputs to downstream measurement circuitry. Two SPST channels and guaranteed 3-ohm maximum matching can support paired or differential routing functions, while 4-ohm maximum flatness limits resistance variation across the stated signal range. The bidirectional conduction behavior allows the switch to be used for signal paths where direction changes with the acquisition source. A practical implementation should minimize PCB leakage around high-impedance nodes and place the switch where its capacitance will not compromise acquisition bandwidth. The complete datasheet is required to confirm switch-off isolation, charge injection, operating voltage, and logic compatibility.
Low-Power Control Module
The DG421DJ is appropriate for low-power control modules that need a compact, electronically controlled analog-routing function with a latched state. Its designation as an improved low-power CMOS analog switch supports power-conscious signal-path designs, while the DIP-16 package offers through-hole accessibility for industrial and educational equipment. The latch can maintain a chosen connection without requiring a continuously toggled control waveform. Design validation should include a detailed power-consumption estimate based on the actual supply voltage and control sequence, plus confirmation of logic thresholds, quiescent current, and switching behavior because the supplied source material does not provide those numerical limits.
נתוני עזר הנדסיים עבור DG421DJ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה |
|---|---|
| Switch Configuration | Dual SPST |
| Control Type | Latch |
| Typical On-Resistance | 20 ohm |
| On-Resistance Matching | 3 ohm maximum |
| On-Resistance Flatness | 4 ohm maximum |
| Temperature Grade | Industrial |
| Package | DIP-16 |
| Brand | Maxim Integrated |
| Mounting Type | Through-hole |
| Number of Terminals | 16 |
מבדילים עיקריים
- Guaranteed resistance matching (לעומתDG421DK)
- Specified on-resistance flatness (לעומתDG421DK)
- Confirmed through-hole package construction (לעומתDG421DK)
הערות תכנון
Do not substitute a related DG421-family suffix solely because its core resistance specifications appear identical. The verified material does not prove that DG421DK has the same DIP-16 package, terminal assignments, temperature grade, or latch behavior as DG421DJ. Treat the suffix code as part of the ordering configuration and confirm the package row, pin diagram, and electrical limits in the manufacturer datasheet before approving a substitution.
Include the switch's 20-ohm typical on resistance in the source-impedance and settling calculations for the selected channel. The guaranteed 3-ohm maximum matching and 4-ohm maximum flatness help constrain channel differences, but they do not eliminate errors from amplifier input bias current, off leakage, charge injection, or finite bandwidth. Those unverified parameters should be obtained from the complete datasheet and checked against the required measurement accuracy.
Route high-impedance sensor and sample nodes with short traces and adequate guarding to reduce leakage and capacitive pickup. Keep the analog switched path away from high-current switching nodes, clock edges, and inductors. Because the supplied material does not identify the complete terminal functions or internal control arrangement, final placement and grounding must follow the verified DG421DJ pin diagram and the application circuit in the manufacturer documentation.
Determine control and supply sequencing from the complete manufacturer specification rather than assuming conventional enable logic. The latch is a distinguishing function of the DG421 family, and incorrect control sequencing could produce unintended channel states. Use the datasheet's truth table and timing information to establish safe states during reset and power transitions, then validate quiescent current and dynamic power against the module's thermal budget.
מידע על תאימות
The supplied verified data identifies industrial temperature grade but does not provide explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 statements. Compliance should be confirmed using the current manufacturer product page or declarations for the exact ordering code.
