DG418CY+ - 35Ω SPST CMOS Analog Switch | Maxim
料号： DG418CY+ ✓ 量产中DG418CY+ 概述
An analog switch is a semiconductor-controlled routing component that connects or disconnects analog signals under digital control. The DG418 belongs to the broader analog-switch and multiplexer hierarchy, where it belongs to the interface-IC and signal-routing category. Unlike a mechanical relay, it operates without moving contacts and is therefore suitable for compact instrumentation, data-acquisition, industrial-control, and test-equipment systems.
Key electrical features include a low on-resistance, low charge injection of 10 pC maximum, and off-leakage current below 5 nA at +85 °C. These characteristics reduce signal-distortion and settling effects in precision circuits. The switch conducts equally well in either signal direction and includes ESD protection of 2000 V minimum according to Method 3015.7. Its low power consumption also makes it suitable for systems where supply current is constrained.
The DG418CY+ uses precision CMOS circuitry to provide a consistent resistance when the switch closes. On-resistance matching limits channel-to-channel variation in designs that use multiple switches, while flatness describes how little the on-resistance changes across the usable signal range. These two properties help preserve amplitude accuracy and simplify calibration when the device is used in measurement front ends or signal-routing matrices.
Typical applications include data acquisition, instrumentation, industrial control, sample-and-hold systems, test and measurement equipment, and general-purpose analog signal routing. In these systems, the DG418CY+ can isolate a sensor, route a test signal, or select a measurement path without introducing excessive resistance, charge injection, or off-state leakage.
Designers should use the pin-description and typical application circuits in the manufacturer data sheet when assigning control inputs and signal pins. The analog signal path should remain within the device's published voltage and current limits, while the control signal should use the logic levels specified for the particular DG418 variant. PCB signal traces should be short and appropriately terminated to minimize coupling into the switched node.
This product page combines the manufacturer's DG418 family documentation, package and circuit details, procurement facts, replacement analysis, and practical design guidance. It also distinguishes exact drop-in interchangeability from devices that merely use the same package or offer related switching functions.
直接替换替代料： DG418CY+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料DG418CY+ 最大额定值与电气特性
| Switch Type | SPST - NO |
| Number of Circuits | 1 circuit |
| Multiplexer Configuration | 1:1 |
| On-Resistance | 35 Ω maximum |
| On-Resistance Matching | 3 Ω maximum between switches |
| On-Resistance Flatness | 4 Ω maximum over signal range |
| Charge Injection | 10 pC maximum |
| Off-Leakage Current | <5 nA at +85 °C |
| ESD Tolerance | 2000 V minimum per Method 3015.7 |
| Signal Conduction Direction | Bidirectional |
| Technology | Precision CMOS |
| Architecture | Monolithic analog switch |
| 封装 | 8-pin SOIC, 3.90 mm width |
| 安装类型 | Surface mount |
| Temperature Grade | Commercial |
| 生命周期状态 | Production |
DG418CY+ 8-pin soic, 3.90 mm width 引脚配置指南
DG418CY+（8-pin soic, 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： DG418CY+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DG418CY+ 适用于 6 应用s: Data-Acquisition Signal Routing, Precision Test and Measurement, Industrial Sensor Interface, Sample-and-Hold Signal Path, Analog Control Signal Selection, General-Purpose Analog Multiplexing.
Data-Acquisition Signal Routing
The DG418CY+ fits signal-routing paths in data-acquisition systems because its 35 Ω maximum on-resistance limits insertion loss, while on-resistance matching of 3 Ω maximum helps maintain consistency between switched paths. Place the device between the input signal and acquisition circuitry, then control it from the host or measurement controller. Designers should verify the published signal-voltage, current, and supply limits, and should account for 10 pC maximum charge injection when timing-sensitive settling is important.
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Precision Test and Measurement
The DG418CY+ is appropriate for precision test equipment where a compact switch must route low-level analog signals without adding excessive resistance. Its 35 Ω maximum on-resistance and 4 Ω maximum on-resistance flatness help control gain error across the measured signal range. Use the switch to isolate a source, apply a calibration path, or connect a sensor during self-test, while keeping control traces away from sensitive analog nets to minimize switching coupling.
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Industrial Sensor Interface
The DG418CY+ can route sensor outputs within industrial control and acquisition systems while maintaining a compact surface-mount footprint. The low off-leakage rating of less than 5 nA at +85 °C is useful when high-impedance sensing nodes require low unwanted coupling between channels. Its normally open SPST configuration provides a direct path for connecting and disconnecting a selected sensor. Confirm the industrial temperature requirement and all signal limits in the DG418 family documentation before production use.
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Sample-and-Hold Signal Path
The DG418CY+ can serve as a routing element in sample-and-hold front ends where charge injection and leakage influence settling accuracy. The specified charge injection of 10 pC maximum provides a concrete basis for evaluating error-budget requirements, while the low on-resistance limits signal attenuation. Place the switch close to the sampling node and use a controlled acquisition sequence, because switching timing and parasitic capacitance can combine with charge injection to determine the final settling behavior.
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Analog Control Signal Selection
The DG418CY+ suits analog control paths that require a normally open connection and bidirectional signal flow. Because the switch conducts equally well in either direction, it can support feedback routing, reference selection, or command-path isolation. Its 35 Ω maximum on-resistance should be checked against the impedance of the driven network, and the 3 Ω maximum matching specification should be considered whenever resistance variation affects control accuracy. Use the manufacturer pin descriptions to preserve the intended signal and common-node connections.
推荐
General-Purpose Analog Multiplexing
The DG418CY+ is useful in general-purpose analog routing systems that need one selectable SPST path rather than a full multiplexer. Its precision-CMOS construction, 35 Ω maximum on-resistance, and low power consumption support compact control systems where space and energy are important. The device can select between routed signal sources when the architecture only requires one connection at a time. For designs needing simultaneous selection of multiple inputs, choose a dedicated multiplexing device instead of adding unrelated switch functions.
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推荐产品汇总
工程参考数据： DG418CY+ ——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 |
|---|---|
| Brand | Maxim Integrated |
| Package | 8-pin SOIC |
| Switch Type | SPST - NO |
| Number of Circuits | 1 circuit |
| Multiplexer Configuration | 1:1 |
| On-Resistance | 35 Ω maximum |
| On-Resistance Matching | 3 Ω maximum between switches |
| On-Resistance Flatness | 4 Ω maximum over signal range |
| Charge Injection | 10 pC maximum |
| Off-Leakage Current | <5 nA at +85 °C |
| ESD Tolerance | 2000 V minimum per Method 3015.7 |
关键差异点
- Single normally open SPST organization （对比 DG419CY+)
- Low charge injection for routing precision signals （对比 DG420CY+)
- Guaranteed resistance matching and flatness （对比 DG420CY+)
设计说明
Route the switched analog node as a short, continuous trace and place the DG418CY+ close to the source or acquisition input. The 35 Ω maximum on-resistance contributes insertion loss, but PCB resistance and capacitance add to that loss. Keep the control input away from the analog trace, use a ground reference plane, and avoid long stubs so switching transients are not coupled into the measured signal.
Do not substitute a same-package device solely because it is labeled as an equivalent. The DG418CY+ provides one normally open SPST path, and related DG419 and DG420 products use different switching organizations. Verify the functional configuration, control polarity, supply pins, signal limits, and exact pin assignments in the manufacturer data sheet. Tape-and-reel ordering suffixes should also be checked for orientation and moisture-handling requirements.
Use the supply and control levels specified for the DG418 family, and decouple the supply pins according to the manufacturer's recommended layout. Although the part has low power consumption, supply bypassing still helps isolate the switched network from control-logic transients. Place the decoupling capacitor near the device, preserve a continuous return path, and avoid routing switching current through sensitive analog ground regions.
合规信息
The manufacturer documentation confirms an 8-pin SOIC commercial-grade package and ESD tolerance of 2000 V minimum per Method 3015.7. Specific RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations are not stated in the cited product information.