DG445DY+ - Quad SPST Analog Switch | Maxim Integrated
料号： DG445DY+ ✓ 量产中DG445DY+ 概述
An analog switch is a semiconductor device that routes analog or digital signals between circuit nodes under control of digital logic. The SPST designation means each of the four channels has one signal terminal and one switched terminal, while the normally open configuration leaves each channel disconnected until its control input is asserted. Within the broader hierarchy, DG445DY+ is an analog switch, interface IC, and discrete signal-routing component used between sensors, converters, test circuits, and signal-processing stages.
Key improvements include on-resistance matching of 4 Ω maximum between switches and on-resistance flatness of 9 Ω maximum over the signal range. These characteristics help minimize channel-to-channel variation when the four switches must process comparable signals. The 85 Ω on-resistance reported by DigiKey and the 160 Ω figure shown by FindIC are retained as sourced observations, while the improved flatness specification is especially relevant to precision acquisition and test-equipment signal paths.
The DG445 family was designed on a high-voltage silicon-gate CMOS process. Silicon-gate construction supports low leakage and reliable operation across wide supply voltages, while CMOS control inputs allow the device to interface with both TTL and CMOS logic systems. The manufacturer documentation identifies low signal error and distortion, reduced power-supply requirements, faster throughput, improved reliability, reduced pedestal errors, and simple interfacing as device benefits.
Typical uses include audio switching, battery-powered systems, data acquisition, sample-and-hold circuits, telecommunications, automatic test equipment, and single-supply circuits. A four-channel SPST arrangement is particularly useful when several independent analog paths must be connected or isolated under digital control, such as selecting external sensors or routing instrumentation signals.
Designers should verify the applicable supply configuration, control levels, and signal-voltage limits before layout. Keeping sensitive analog traces short and connecting the device ground pins to a low-impedance ground plane helps control return currents. Because on-resistance and matching are circuit-level errors, the switch should not be treated as an ideal zero-resistance path during signal-chain calculations.
This page consolidates manufacturer information, distributor pricing, source-backed electrical characteristics, drop-in candidate evaluation, and practical selection guidance. It also distinguishes verified values from specifications that require confirmation, helping engineers compare DG445DY+ with its closest package-compatible alternatives without assuming unreported electrical data.
直接替换替代料： DG445DY+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
DG445DY-T1
✅ 直接替换📋 参考替代料（不在目录中）
DG445DY
✅ 直接替换📋 参考替代料（不在目录中）
DG445DY-E3
✅ 直接替换📋 参考替代料（不在目录中）
DG445DY+ 最大额定值与电气特性
| Switch Type | SPST, normally open |
| Number of Channels | 4 independent channels |
| On-Resistance | 85 ohm |
| Alternate Sourced On-Resistance | 160 ohm |
| On-Resistance Matching | 4 ohm maximum between switches |
| On-Resistance Flatness | 9 ohm maximum over the signal range |
| Positive Supply Range | 10 V to 30 V |
| Dual-Supply Range | +/-4.5 V to +/-20 V |
| Logic Low Threshold | 0.8 V maximum |
| Logic High Threshold | 2.4 V minimum |
| Logic Compatibility | TTL and CMOS compatible |
| Switch Configuration | 1:1 |
| 封装 | 16-pin NSOIC, 3.90 mm width |
| Process Technology | High-voltage silicon-gate CMOS |
| 工作温度 | -40 C to +85 C |
| Turn-On Time | 250 ns |
| Turn-Off Time | 210 ns |
DG445DY+ 16-pin nsoic, 3.90 mm width 引脚配置指南
DG445DY+（16-pin nsoic, 3.90 mm width 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： DG445DY+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DG445DY+ 适用于 6 应用s: Audio Signal Switching, Battery-Powered Measurement Systems, Data Acquisition Front Ends, Sample-and-Hold Circuits, Telecommunications Equipment, Automatic Test Equipment.
Audio Signal Switching
The DG445DY+ fits audio routing circuits requiring four independent, normally open signal paths in a 16-pin NSOIC package. Its on-resistance matching of 4 Ω maximum reduces signal-dependent variation between channels, while the 9 Ω maximum flatness specification helps limit resistance-related level changes across the signal range. Each channel can connect or isolate an audio path under TTL- or CMOS-compatible control. Because the device adds resistance and exhibits switching transients, its contribution should be included in insertion-loss and distortion budgets rather than treated as ideal. The documented audio-switching use of the DG445 family makes the part appropriate for source selection, mute functions, and externally controlled audio test paths.
推荐
Battery-Powered Measurement Systems
DG445DY+ can route four sensor or control signals in battery-powered equipment while operating from a 10 V to 30 V positive supply or a compatible dual supply. The normally open configuration provides a defined disconnected state between the drain and source terminals until the control input activates a channel. Its TTL- and CMOS-compatible thresholds of 0.8 V and 2.4 V make the control interface compatible with many embedded logic levels. The main design concern is power budget: every asserted switch path consumes signal-dependent current, so engineers should verify leakage, on-state dissipation, and logic-drive requirements against the battery load.
推荐
Data Acquisition Front Ends
The four independent SPST channels of DG445DY+ are useful for connecting external sensors, selecting test inputs, and isolating acquisition paths. Low channel-to-channel on-resistance matching of 4 Ω maximum helps maintain more consistent gain and attenuation than an unspecified switch, while the 9 Ω maximum flatness specification controls variation over the signal range. The part is especially relevant where several similar inputs are sampled through comparable paths. Designers should calculate the 85 Ω sourced on-resistance as part of source loading and use the datasheet switching-time data to account for 250 ns turn-on and 210 ns turn-off timing during acquisition timing analysis.
推荐
Sample-and-Hold Circuits
DG445DY+ can provide the switching element in sample-and-hold and guarded measurement arrangements where four signal paths must be connected independently. The improved matching and flatness specifications help minimize changes in effective source resistance as different channels are selected. Its four normally open switches can support isolation during hold periods, sampling of multiple inputs, or controlled experiments that require repeatable path selection. The 250 ns turn-on and 210 ns turn-off values provide concrete timing data for acquisition-system design. Engineers should still include switch on-resistance, off-state leakage, control propagation delay, and capacitor settling behavior in the overall error and acquisition-time analysis.
推荐
Telecommunications Equipment
The DG445DY+ supports telecommunications equipment that needs controlled routing of multiple analog or logic signals in a compact 16-pin NSOIC package. The documented DG445 family applications include telecommunications systems, and its TTL- and CMOS-compatible inputs allow direct use with common control logic. Four SPST channels can isolate external lines, select monitoring paths, or control test access in line-card equipment. The 10 V to 30 V supply range supports higher-voltage systems, although actual signal amplitudes must remain within the complete datasheet limits. For telecom-grade products, procurement should separately confirm lifecycle, qualification, and compliance records because those details were not available in the supplied evidence.
推荐
Automatic Test Equipment
Automatic test equipment can use the four independently controlled DG445DY+ channels to connect and isolate device-under-test signals. Improved on-resistance matching of 4 Ω maximum and flatness of 9 Ω maximum are useful when repeatability across multiple test paths matters. The part is listed for automatic test equipment applications and its 250 ns turn-on and 210 ns turn-off timing can be considered during fixture and timing design. The normally open topology avoids unintentionally tying test nodes together until a path is explicitly selected. Production substitution should verify the full pin map, absolute maximum ratings, lead time, and the exact suffix used for production traceability.
推荐
推荐产品汇总
工程参考数据： DG445DY+ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | DG445DY-T1 | DG445DY | DG445DY-E3 |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Analog Devices | Vishay Intertechnology |
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Switch Configuration | 4-channel SPST, normally open | 4-channel SPST | 4-channel SPST | 4-circuit 1:1 switch |
| On-Resistance | 85 ohm | 85 ohm | 85 ohm | 85 ohm |
关键差异点
- Documented channel-to-channel resistance matching （对比 DG445DY-E3)
- Guaranteed resistance flatness over the signal range （对比 DG445DY-T1)
- Quantified switching timing （对比 DG445DY-E3)
- Wide documented supply operation （对比 DG445DY-T1)
设计说明
Route analog switch terminals directly toward the connected signal nodes and keep control traces away from sensitive analog paths. Place the device close to the source of the switched signal to minimize parasitic capacitance and inductance introduced by PCB traces. A continuous ground plane and short ground-return paths are important because switch transitions can couple current into adjacent signal lines even when the logical control edge is clean.
Include the sourced 85 Ω on-resistance when calculating attenuation and source loading, and account separately for the 4 Ω maximum matching and 9 Ω maximum flatness specifications. These values describe different errors: matching controls variation between channels, while flatness controls variation across the signal range. Neither value should be interpreted as absolute on-resistance accuracy, and neither removes the need to evaluate downstream amplifier input impedance.
Decouple the supply pins with a local high-frequency bypass capacitor and provide a low-impedance return to the device ground. The control thresholds are compatible with 0.8 V low and 2.4 V high logic, but the complete supply and signal limits must be checked in the official datasheet. Ensure that transitions do not produce supply disturbance that propagates into the switched analog network, particularly in battery-powered or precision acquisition systems.
Do not assume that all DG445 order codes are automatically interchangeable. The plus designation, temperature suffix, tape-and-reel suffix, manufacturer, and production status can affect ordering or qualification even when the package is identical. Before using DG445DY-T1 or DG445DY-E3 as a substitute, compare the complete numbered pinout, absolute maximum ratings, logic thresholds, switching timing, leakage, and production documentation.
合规信息
No explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations were included in the supplied verified data. These fields remain unknown rather than being inferred.
