DG444DY+ - 85 Ohm Quad SPST CMOS Analog Switch | Maxim
MPN： DG444DY+ ✓ 啟用中DG444DY+ 概覽
An analog switch is a solid-state routing element that connects or disconnects signal paths under digital control. The DG444 belongs to the interface IC hierarchy, where analog switches sit above multiplexers, demultiplexers, and general-purpose signal-routing components. Unlike a mechanical relay, the DG444DY+ has no moving contacts, allowing fast switching, low power consumption, and compact integration into analog measurement, test, and communication equipment.
Important DG444DY+ features include low on-resistance, low leakage, low power consumption, and low charge injection. According to the Vishay DG444 data sheet, the DG444 and DG445 families use a high-voltage silicon-gate process, while an epitaxial layer helps prevent latchup. The redesigned DG444 series also specifies on-resistance matching between switches of 4 ohm maximum and guaranteed on-resistance flatness of 9 ohm maximum over the signal range.
The DG444DY+ contains four independent single-pole, single-throw switches. Each channel can conduct signal flow in either direction, allowing the same device to implement signal selection, source multiplexing, sample-and-hold routing, test-point isolation, and programmable gain-stage feedback control. Its monolithic CMOS construction supports compact, low-power designs, while the 16-pin SOIC package allows conventional surface-mount assembly and straightforward PCB footprint matching with compatible quad-SPST switch families.
Typical uses include multimeter and oscilloscope input routing, automated test equipment, audio path selection, data acquisition systems, and instrumentation where several analog nodes must connect to a shared measurement path. The DG444DY+ is also appropriate where TTL-compatible or CMOS-compatible control levels are available and where switching speed and low off leakage are more important than very low on-resistance.
When laying out a DG444DY+ circuit, place the device close to the switched signal nodes to minimize parasitic capacitance and coupling. Keep control traces away from sensitive analog conductors, use a defined return path for digital control signals, and confirm the actual signal amplitude against the device's absolute maximum ratings. Verify the exact power-supply and signal-range limits in the manufacturer data sheet before applying the part to a new design.
This page combines verified manufacturer and distributor information, package-level drop-in alternatives, a parameter comparison, and practical PCB guidance. It is intended to help engineers evaluate the DG444DY+ faster than by reading the datasheet alone, while clearly separating documented values from specifications that still require confirmation.
直接替換替代品，適用於 DG444DY+ — 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。
MAX4427
✅ 直接替換📋 參考替代品（不在目錄中）
DG444DYZ-T
✅ 直接替換📋 參考替代品（不在目錄中）
DG444DY-T1-E3
✅ 直接替換📋 參考替代品（不在目錄中）
ADG444ABRZ
✅ 直接替換📋 參考替代品（不在目錄中）
CD74HC4066M
✅ 直接替換📋 參考替代品（不在目錄中）
DG444DY+ 最大額定值與電氣特性
| Number of Switches | 4 |
| Switch Configuration | SPST |
| On-Resistance Matching Between Switches | 4 ohm maximum |
| On-Resistance Flatness Over Signal Range | 9 ohm maximum |
| Maximum On-Resistance | 85 ohm |
| Maximum On-Time | 250 ns |
| Logic Compatibility | TTL and CMOS compatible |
| Process Technology | High-voltage silicon-gate CMOS |
| Latchup Protection | Epitaxial layer |
| 封裝 | 16-pin SOIC |
| 安裝類型 | Surface Mount |
| 腳位數 | 16 |
| Analog Signal Direction | Bidirectional |
DG444DY+ 16-pin soic 腳位配置指南
DG444DY+（16-pin soic 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： DG444DY+.
請參閱 資料表 以查看完整腳位配置。
典型應用
DG444DY+ 適用於 6 應用s: Automated Test Equipment Signal Routing, Multimeter and Oscilloscope Input Multiplexing, Data Acquisition Multiplexing, Audio Path Selection and Mute Control, Programmable Gain and Feedback Routing, Battery-Powered Sensor and IoT Interface Routing.
Automated Test Equipment Signal Routing
The DG444DY+ fits automated test equipment because four independent SPST channels can connect the same instrument or measurement resource to four different test nodes. Each switch conducts bidirectionally, which supports stimulus-to-DUT and DUT-to-measurement routing without separate relay drivers. The documented 85 ohm maximum on-resistance and 250 ns maximum on-time permit controlled selection of test points, although fixture wiring resistance should be included in the error budget. TTL- and CMOS-compatible control inputs simplify connection to legacy test controllers, while low leakage helps preserve high-impedance node states. Designers should still check the exact switch voltage, current, and supply limits in the manufacturer data sheet before defining the matrix current.
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Multimeter and Oscilloscope Input Multiplexing
The DG444DY+ can route several measured nodes to a shared oscilloscope or multimeter input, reducing the need for separate front-end wiring. Four SPST channels provide independent selection rather than a fixed multiplexing order, and the 85 ohm maximum on-resistance is manageable for many low-frequency measurements when the instrument input impedance is high. Bidirectional conduction allows the same device to support either measurement or source routing. Engineers should account for switch leakage, off-state impedance, and input capacitance when probing high-impedance sensors. Because the exact operating voltage and current ratings were not included in the verified source snippets, confirm them in the DG444 data sheet before connecting external nodes.
推薦
Data Acquisition Multiplexing
The DG444DY+ is applicable to compact data-acquisition systems that must select among several analog inputs using limited digital control resources. Its four independent SPST channels permit arbitrary connection rather than a rigid multiplexer sequence, and the low-power CMOS construction suits battery-powered instrumentation. The 250 ns maximum on-time is far faster than the settling requirement of most slow sensor signals, so the practical limitation is typically analog settling and leakage rather than switching delay. Use the switch in a grounded, compact layout and add an amplifier with high input impedance when the source impedance is high. Verify signal amplitude, supply voltage, and leakage against the full manufacturer specifications before deployment.
推薦
Audio Path Selection and Mute Control
The DG444DY+ can select or isolate one of four audio-related signal paths in consumer and industrial equipment. Bidirectional SPST operation makes the same channel usable for an audio signal or a control line, while low charge injection helps reduce switching transients in sensitive analog circuits. The 85 ohm maximum on-resistance can become significant when driving a low-impedance audio load, so the device is better suited to high-impedance or bridging paths than to direct headphone drive. Place the switch near the source and return to reduce capacitance and crosstalk. Confirm the audio peak amplitude against the verified signal-voltage rating before use and consider an external amplifier when lower insertion loss is required.
推薦
Programmable Gain and Feedback Routing
The DG444DY+ can implement programmable feedback or gain-setting networks by connecting one of several resistive branches to a common analog node. Four SPST channels allow independent branch selection, and the switch's bidirectional conduction simplifies feedback topology design. Its 250 ns maximum on-time is negligible relative to most amplifier settling intervals, although the 85 ohm maximum on-resistance should be included when it corrupts feedback accuracy. For high-gain systems, leakage, off-state impedance, and charge injection can dominate performance, so the surrounding amplifier and PCB cleanliness are important. Confirm the switch's maximum signal voltage and temperature range in the manufacturer data sheet, and verify settling in the complete analog loop rather than relying only on switching time.
推薦
Battery-Powered Sensor and IoT Interface Routing
The DG444DY+ suits compact IoT and battery-powered sensor interfaces that require switching among local analog nodes without the power consumption and size of mechanical relays. Its low-power CMOS construction and four independent channels support duty-cycled routing, while TTL- and CMOS-compatible control levels allow direct control from low-voltage microcontroller peripherals or I/O expanders. The 85 ohm maximum on-resistance is acceptable for many high-impedance sensing paths but can degrade accuracy with low-impedance sources. Keep the device and protected nodes close together to reduce leakage and coupling, and use a high-impedance amplifier where source impedance is high. The verified excerpts do not state the supply range, so confirm operating voltage before it is used in a battery design.
推薦
推薦產品摘要
工程參考資料，適用於 DG444DY+ — 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 | MAX4427 | DG444DYZ-T | DG444DY-T1-E3 | ADG444ABRZ | CD74HC4066M |
|---|---|---|---|---|---|---|
| Package | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Vishay Intertechnology | Analog Devices | Texas Instruments |
| Number of Switches | 4 | 4 | 4 | 4 | 4 | 4 |
| Switch Configuration | SPST | SPST | SPST | SPST | SPST | SPST |
主要差異化特點
- Closest listed family alternative retains the same 85 ohm on-resistance rating (對比DG444DY-T1-E3)
- Documented switch-to-switch matching supports multichannel measurement consistency (對比ADG444ABRZ)
- Guaranteed flatness improves behavior across the analog signal range (對比CD74HC4066M)
設計說明
Place the DG444DY+ close to the switched nodes and use the shortest practical analog traces. Long traces add parasitic capacitance and can increase settling time, coupling, and leakage error, particularly in high-impedance measurement circuits. Route the four control inputs away from sensitive analog nets and provide a continuous ground reference under or near the device. Confirm the complete numbered pin map against the manufacturer drawing before PCB release.
The 85 ohm maximum on-resistance can create measurable voltage division when the switched node has a low source impedance or a comparatively low load impedance. Estimated insertion loss can be expressed as 20 log10((RL + RON) / RL) when RL is much greater than RON; for example, 85 ohm in series with 1 kohm produces approximately 0.72 dB of loss under that simplified assumption. Use a switch with lower on-resistance when attenuation is critical.
Do not treat every quad-SPST switch as an automatic drop-in part. Although MAX4427, DG444DYZ-T, DG444DY-T1-E3, ADG444ABRZ, and CD74HC4066M are listed equivalent or comparison candidates with 16-pin SOIC options, verify control-input polarity, supply voltage, signal-voltage limits, channel mapping, and switching timing. Also confirm whether control inputs need pull-up or pull-down resistors, and do not exceed the absolute maximum ratings for unused pins or switched nodes.
合規資訊
The verified snippets mention RoHS information but do not provide a definitive status. The DG444DY+ is an interface IC and is not presented as an AEC-Q100 automotive-qualified device. Compliance declarations must be confirmed against the exact current manufacturer product documentation.