DG418DJ+ - 35Ω SPST Analog Switch | Analog Devices
MPN： DG418DJ+ ✓ 啟用中DG418DJ+ 概覽
An analog switch is a semiconductor device that routes electrical signals between circuit nodes under digital control. Unlike a mechanical relay, it has no moving contacts and can switch rapidly with low power consumption. In the power-management hierarchy, the DG418DJ+ belongs to the interface-IC category, where analog switches connect precision measurement, communication, audio, and instrumentation circuits to shared signal paths.
The principal features include a 35 Ω on-resistance, 100 ns turn-on action, and 35 nW power dissipation. A 15 V analog signal range provides compatibility with conventional bipolar and CMOS signal systems, while the 44 V maximum supply rating provides additional operating margin. TTL compatibility allows the switch to be driven by common digital logic levels without an additional level-conversion stage.
Internally, the DG418DJ+ uses CMOS circuitry to control the analog path. Its low power requirement makes it appropriate for continuously connected signal-routing systems where relay-style control current would be excessive. Fast switching action also allows the device to respond quickly to digital selection signals, although delay, bandwidth, charge injection, and off-isolation characteristics must be considered when designing around the switching edges.
Typical uses include multimeter and oscilloscope input routing, test and measurement systems, sample-and-hold systems, battery-powered instrumentation, analog signal multiplexing, and industrial control interfaces. The normally open configuration is particularly useful when a signal path must remain disconnected until the control input activates it.
For layout, keep routing from the control pin and analog terminals short, and maintain a common ground reference between the switch and the connected circuit. Check the supply input, control thresholds, signal range, and off-state isolation in the manufacturer datasheet before finalizing a design. The through-hole PDIP package also requires adequate spacing for lead insertion and soldering.
直接替換替代品，適用於 DG418DJ+ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： DG418DJ+ （相同外形與佔位） — 差異在於 Mounting Type, Package, Switch Configuration.
ADG411
✅ 直接替換📋 參考替代品（不在目錄中）
DG418DJ
✅ 直接替換📋 參考替代品（不在目錄中）
DG418CJ+
✅ 直接替換📋 參考替代品（不在目錄中）
DG418DJ+ 最大額定值與電氣特性
| Product Type | Precision CMOS analog switch |
| Switch Configuration | SPST normally open |
| Number of Channels | 1 channel |
| On-Resistance | 35 ohm maximum |
| Analog Signal Range | 15 V maximum |
| Supply Voltage Maximum | 44 V |
| Turn-On Time | 100 ns |
| Power Dissipation | 35 nW |
| Control Logic Compatibility | TTL and CMOS |
| 封裝 | 8-pin PDIP |
| 安裝類型 | Through-hole |
| On-Resistance Matching Between Switches | 3 ohm maximum |
| On-Resistance Flatness Over Signal Range | 4 ohm maximum |
| 腳位數 | 8 pins |
DG418DJ+ 8-pin pdip 腳位配置指南
DG418DJ+（8-pin pdip 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： DG418DJ+.
請參閱 資料表 以查看完整腳位配置。
典型應用
DG418DJ+ 適用於 6 應用s: Multimeter Signal Routing, Oscilloscope Input Selection, Programmable Test Fixture, Battery-Powered Instrumentation, Analog Signal Multiplexing, Sample-and-Hold Signal Path.
Multimeter Signal Routing
The DG418DJ+ fits a multimeter input network that must connect a selected source to an analog measurement path without using a power-hungry mechanical relay. Its 100 ns turn-on action responds quickly to range and function selection commands, while the 35 nW power dissipation supports portable instruments that remain connected for extended periods. The normally open SPST configuration prevents the selected signal path from conducting until the control input activates it. Designers should verify the instrument's maximum input voltage against the 15 V analog-signal rating and confirm control thresholds using TTL- or CMOS-compatible logic. The 8-pin PDIP package is convenient for through-hole assembly and repair of legacy test equipment.
推薦
Oscilloscope Input Selection
The DG418DJ+ can route an external test signal into an oscilloscope input when a selected measurement channel must be enabled rapidly. Its 100 ns turn-on time supports short acquisition intervals, and the 35 ohm maximum on-resistance helps limit signal degradation in moderate-impedance instrumentation paths. The device also preserves low system power because its stated dissipation is only 35 nW. Designers should account for probe capacitance, bandwidth limits, and signal attenuation when assessing whether 35 ohm is acceptable. Control routing should be kept away from sensitive analog traces, and the switch's supply and ground pins must be decoupled according to the manufacturer's layout guidance.
推薦
Programmable Test Fixture
A programmable test fixture benefits from the DG418DJ+ when different sensor or DUT nodes must be connected to a shared measurement channel under digital control. The SPST normally open topology provides straightforward point-to-point routing, and the 100 ns switching action allows fixture selection logic to respond without mechanical-relay delay. Its 35 nW power dissipation is particularly useful in multi-channel fixtures where many switch positions may remain active. The design should verify leakage, off-isolation, charge injection, and bandwidth because those parameters determine the error introduced into high-impedance measurements. The 8-pin PDIP construction also supports economical fixture construction and field replacement.
推薦
Battery-Powered Instrumentation
The DG418DJ+ is appropriate for portable measurement equipment because the CMOS control path has a stated power dissipation of 35 nW. A normally open switch can connect a sensor, reference, or calibration source only while it is needed, reducing unnecessary loading without the continuous coil current required by a mechanical relay. Its 100 ns turn-on time permits rapid range changes, and the 15 V analog-signal range covers many low-voltage sensor systems. Designers should confirm supply compatibility, control voltage thresholds, and the complete switching characteristics in the datasheet. Low-power operation must also be evaluated with the surrounding instrumentation because op-amp, display, and reference currents may dominate total consumption.
推薦
Analog Signal Multiplexing
The DG418DJ+ can serve as a point-select element in a larger analog multiplexing arrangement where one common measurement channel is connected to a selected source. Its 100 ns turn-on action provides quick source selection, while the 35 ohm maximum on-resistance limits insertion loss in moderate-impedance systems. The 44 V maximum supply rating offers margin above the 15 V analog signal range, but both limits must be respected independently. For high-frequency or high-impedance nodes, verify bandwidth, capacitance, leakage, and charge injection before assigning an error budget. The device should be placed close to the multiplexed signal source when trace length and coupling would otherwise distort the measurement.
推薦
Sample-and-Hold Signal Path
The DG418DJ+ can control connection of a live analog node in a sample-and-hold or measurement-acquisition system. Its 100 ns turn-on action minimizes the interval between the sampling command and signal capture, while its low 35 nW dissipation avoids adding substantial continuous load to precision circuitry. The normally open configuration is useful when the source must be isolated until acquisition begins. In a practical design, the switch's on-resistance, bandwidth, off-isolation, and charge injection must be compared with the sample-and-hold device's acquisition requirements. Keep the analog route short, provide a stable ground reference, and use separate routing for the digital control trace to reduce coupling into the held signal.
推薦
推薦產品摘要
工程參考資料，適用於 DG418DJ+ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADG411 | DG418DJ | DG418CJ+ | DG411 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Vishay | Vishay | Texas Instruments |
| Package | PDIP-8 | PDIP-8 | PDIP-8 | PDIP-8 | PDIP-8 |
主要差異化特點
- Fast normally open signal routing (對比DG411)
- Established 8-pin PDIP footprint (對比ADG411)
- Low-power CMOS control path (對比DG418CJ+)
設計說明
Keep the switched analog path short and connect the switch ground directly to the source and destination ground references. A 35 ohm maximum on-resistance may be acceptable for moderate-impedance measurements, but attenuation and loading become more significant as source impedance rises. For high-impedance nodes, check leakage, off-isolation, charge injection, and bandwidth before defining the measurement accuracy.
Route the digital control input away from the analog terminals and the high-impedance signal node. Place any required bypass capacitor close to the supply and ground pins using the shortest possible traces. This reduces coupling from the 100 ns switching edge into the selected analog path and helps preserve the precision behavior expected from a low-noise CMOS switch.
Do not treat the 44 V maximum supply rating as permission to apply 44 V to the analog signal terminal. The stated analog signal range is 15 V, and the control input has its own logic thresholds. Verify pin assignments, supply polarity, normally open behavior, and input levels against the manufacturer datasheet before replacing an existing DG418DJ+ in service equipment.
合規資訊
Compliance status requires confirmation from the current manufacturer product documentation or declaration for the exact DG418DJ+ ordering code.