DG405DY+ - Dual 2:1 CMOS Analog Switch, 45 Ohm, 16-SOIC
料号： DG405DY+ ✓ 量产中DG405DY+ 概述
An analog switch is a semiconductor device that connects or disconnects signal paths under digital control. Unlike a mechanical relay, a CMOS analog switch changes state rapidly with no moving parts. The DG405 belongs to the analog switch hierarchy, which includes multiplexers, demultiplexers, and matrix switches. These devices are widely used to route measurements, control signals, and sensor outputs between shared circuit nodes.
Key electrical features include 45 Ohm typical on-resistance, 20 Ohm typical on-resistance in the redesigned DG405 series, low off leakage of 40 pA, and switch-on time below 100 ns. Charge injection is limited to 15 pC, while on-resistance matching and flatness are guaranteed to 2 Ohm and 3 Ohm maximum, respectively. These characteristics support accurate, high-speed signal routing without the switching transients associated with mechanical contacts.
The DG405 uses monolithic CMOS construction to combine low power consumption with fast control response. TTL-compatible inputs simplify interfacing with legacy digital logic, while CMOS compatibility supports modern controllers. Its 44 V maximum supply rating and 15 V analog signal range provide additional headroom in industrial, instrumentation, and test systems, although the precise minimum supply voltage must be confirmed in the manufacturer datasheet.
Typical uses include multiplexed measurement front ends, sample-and-hold systems, automated test equipment, and control paths where one of two signal sources must be connected to a common amplifier or converter. The device is particularly useful where switching speed and low leakage matter more than ultra-low on-resistance, such as sensor selection, video routing, and precision measurement multiplexing.
When laying out a DG405DY+ board, place input and output traces short, keep analog routing paths away from high-current switching nodes, and use a ground plane that provides a low-impedance return for control and signal currents. Verify that every signal remains within the 15 V analog range and that the supply never exceeds the 44 V maximum rating.
This page combines manufacturer and distributor product information, documented cross-reference alternatives, package details, application guidance, and design notes. It also identifies the verified electrical data and highlights the parameters that still require confirmation from the full manufacturer datasheet before a production design is released.
直接替换替代料： DG405DY+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
DG405DY
✅ 直接替换📋 参考替代料（不在目录中）
DG405CY+
✅ 直接替换📋 参考替代料（不在目录中）
DG405DY-T1
✅ 直接替换📋 参考替代料（不在目录中）
DG405DY-T1-E3
✅ 直接替换📋 参考替代料（不在目录中）
MAX4623ESE+
✅ 直接替换📋 参考替代料（不在目录中）
DG405DY+ 最大额定值与电气特性
| Number of Circuits | 2 circuits |
| Switch Configuration | 2:1 |
| On-Resistance | 45 Ohm |
| Typical Series On-Resistance | 20 Ohm |
| Maximum Supply Voltage | 44 V |
| Analog Signal Range | 15 V |
| Off Leakage Current | 40 pA |
| Switch-On Time | Less than 100 ns |
| Charge Injection | 15 pC maximum |
| On-Resistance Matching | 2 Ohm maximum |
| On-Resistance Flatness | 3 Ohm maximum |
| Logic Compatibility | TTL and CMOS compatible |
| Supply Capability | Single supply |
| Power Consumption | Low power, milliwatt class |
| 封装 | 16-SOIC, N |
| 引脚数 | 16 pins |
| Process Technology | Monolithic CMOS |
DG405DY+ 16-soic, n 引脚配置指南
DG405DY+（16-soic, n 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： DG405DY+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DG405DY+ 适用于 6 应用s: Multiplexed Sensor Measurement, Automated Test Equipment Signal Routing, Sample-and-Hold Acquisition, Industrial Control Signal Multiplexing, Video and Instrumentation Signal Selection, Low-Power Portable Data Acquisition.
Multiplexed Sensor Measurement
The DG405DY+ suits front ends that select among several sensor channels with a shared amplifier or converter. Its two independent 2:1 switch circuits, 45 Ohm on-resistance, and switch-on time below 100 ns support fast channel selection, while 40 pA leakage limits the disturbance applied to high-impedance sources. Place the switch close to the sensor input to minimize parasitic capacitance and allow the following amplifier to settle after each selection. Because charge injection is specified at 15 pC maximum, include acquisition time or an input stage that tolerates the resulting transient. The 15 V analog signal range is suitable for many industrial sensor outputs, although the source amplitude and common-mode voltage must remain within the manufacturer limits.
推荐
Automated Test Equipment Signal Routing
The DG405DY+ can route test signals between a source and a measurement path where fast, repeatable switching is more important than extremely low resistance. Its sub-100 ns switch-on time allows the instrumentation controller to reduce dead time between measurements, and the 20 Ohm typical series on-resistance is acceptable for many moderate-impedance test fixtures. The guaranteed 3 Ohm maximum on-resistance flatness and 2 Ohm maximum matching help reduce channel-dependent errors. Keep the analog path short and place termination resistors near the switch or connector to limit reflections. Account for control-driver delay and downstream settling when calculating the per-point acquisition time.
推荐
Sample-and-Hold Acquisition
The DG405DY+ is appropriate for sample-and-hold circuits that need to disconnect a changing source during the conversion period. The fast switch-on time below 100 ns supports rapid acquisition, while 15 pC maximum charge injection provides a defined bound for the switching transient. Size the hold capacitor according to the source impedance, leakage current, required settling time, and acceptable acquisition error; the 40 pA leakage specification is particularly relevant for high-impedance sources. Position the switch and hold capacitor together to minimize leakage and capacitive pickup. The digital control signal should be referenced to a quiet ground and driven with clean edges to avoid coupling into the held voltage.
推荐
Industrial Control Signal Multiplexing
The DG405DY+ can connect two controlled signal sources to a shared analog input in industrial control and monitoring equipment. TTL- and CMOS-compatible inputs allow connection to a range of controller families, while the low-power monolithic CMOS design avoids the mechanical delay and wear of relay contacts. Its 15 V analog signal range accommodates many process-control signals, and the 44 V maximum supply rating provides useful design headroom. Keep the switched node away from motor, contactor, and power-converter wiring, because those sources can couple transient noise through the high-impedance control circuitry. Verify the actual operating supply range and use a separate return path for digital control currents.
推荐
Video and Instrumentation Signal Selection
The DG405DY+ can select between two analog sources in video monitors, laboratory instruments, and compact data-acquisition systems. The less-than-100 ns switch-on time supports source transitions without mechanical-contact bounce, and the 45 Ohm on-resistance is suitable for many moderate-impedance signal paths. Its low 40 pA leakage is helpful when the selected source has a high output impedance. For high-frequency video or precision small-signal work, keep the traces short, provide a continuous ground reference, and verify bandwidth behavior in the manufacturer data. The device should be mounted close to the source connectors so that cable capacitance does not dominate the settling interval.
推荐
Low-Power Portable Data Acquisition
The DG405DY+ is suitable for portable measurement systems in which a few analog channels must be routed through a shared converter while keeping power use low. Its milliwatt-class CMOS power consumption, 40 pA leakage, and 15 pC maximum charge injection reduce the loading imposed on battery-powered sensor circuits. The compact 16-SOIC package also preserves board area compared with many discrete relay or transistor networks. Confirm the minimum supply voltage before designing it into a single-rail system, and account for level translation if the controlling microcontroller operates from a lower voltage. Keep the analog section physically separated from radio and switching-converter sections to avoid injected noise.
推荐
推荐产品汇总
工程参考数据： DG405DY+ ——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 | DG405DY | DG405CY+ | DG405DY-T1 | DG405DY-T1-E3 | MAX4623ESE+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Vishay Intertechnology | Vishay Intertechnology | Analog Devices / Maxim Integrated |
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Switch Configuration | Dual 2:1 | Dual 2:1 | DG405 family analog switch | Dual 2:1 | Dual 2:1 | Dual analog switch; verify configuration against pinout |
| On-Resistance | 45 Ohm | 45 Ohm | 45 Ohm class | 45 Ohm | 45 Ohm | Not stated in the supplied compatibility source |
| Typical Series On-Resistance | 20 Ohm | 20 Ohm | 20 Ohm class | 20 Ohm | 20 Ohm | Not stated in the supplied compatibility source |
| Maximum Supply Voltage | 44 V | 44 V | 44 V class | 44 V | 44 V | Not stated in the supplied compatibility source |
| Analog Signal Range | 15 V | 15 V | 15 V class | 15 V | 15 V | Not stated in the supplied compatibility source |
| Charge Injection | 15 pC maximum | 15 pC maximum | 15 pC maximum class | 15 pC maximum | 15 pC maximum | Not stated in the supplied compatibility source |
| Off Leakage Current | 40 pA | 40 pA | 40 pA class | 40 pA | 40 pA | Not stated in the supplied compatibility source |
| Price Reference | $6.16 at 1 unit as of 2026-10-28 | Price not stated in the supplied source | Price not stated in the supplied source | Price not stated in the supplied source | Price not stated in the supplied source | Price not stated in the supplied source |
关键差异点
- Documented fast switching with low charge injection （对比 DG405DY-T1-E3)
- Guaranteed on-resistance matching and flatness （对比 MAX4623ESE+)
- Single-supply-compatible low-power CMOS implementation （对比 DG405DY)
设计说明
Keep the switched analog nodes and the receiving amplifier input as short as practical. The DG405DY+ has a documented switch-on time below 100 ns, but that figure excludes control-driver delay and analog settling. Place optional bypass or termination capacitance directly beside the connected device rather than along a long trace. A continuous ground plane under the analog path provides a low-inductance return and reduces susceptibility to charge-injection transients.
Separate the analog routing area from clocks, relays, DC-DC converters, and digital switching outputs. The analog switch may be fast, but its control edges can couple into nearby conductors. Use a solid ground plane, route digital control signals away from high-impedance inputs, and maintain a quiet analog ground region. If the board includes a connector or long trace between the DG405DY+ and the source, place the switch on the protected side of the connector to minimize noise pickup.
Do not treat the 44 V maximum supply rating as the recommended operating supply, and do not exceed the stated 15 V analog signal range without confirmation from the complete datasheet. Also verify that the DG405DY+ terminal configuration matches the intended 2:1 routing before final routing because legacy Vishay and Maxim order codes require cross-reference against the current manufacturer pinout. Add settling time after each switch event instead of assuming the sub-100 ns transition completes the measurement.
合规信息
The supplied manufacturer and distributor excerpts do not contain explicit DG405DY+ RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields must be confirmed using current manufacturer compliance documentation. The Analog Devices DG405 family page identifies the family as PRODUCTION, but production status does not establish automotive qualification.
