DG309CY+ - Quad SPST 100 Ohm Analog Switch | Analog Devices
料号： DG309CY+ ✓ 量产中DG309CY+ 概述
An analog switch is an interface IC that connects or isolates circuit nodes under digital control. It sits between signal sources and destination circuitry within a larger interface or signal-routing architecture. Unlike a mechanical relay, the DG309CY+ uses CMOS electronics to provide compact, fast, low-power switching, making it suitable for test equipment, data acquisition, instrumentation, and embedded control systems.
The DG309CY+ provides four analog switch channels, a 1:1 signal configuration, and 100 ohm on-resistance. Its normally closed operation allows a default signal path to remain connected before the control input is asserted. The 16-pin SOIC package is a surface-mount package that supports conventional PCB assembly, while the exposed package dimensions are not established by the listed product information.
The DG309CY+ is designed for single-pole, single-throw signal routing, not for power switching or high-voltage isolation. Its practical performance depends on the applied signal range, control logic levels, switch charge injection, off leakage, and the impedance of the connected circuit. Those electrical characteristics must be taken from the manufacturer datasheet before finalizing signal-integrity or timing budgets.
Typical uses include analog test-point selection, sensor signal routing, sample-and-hold interfacing, communication path selection, and control of multiple peripheral inputs. A normally closed switch is especially useful where loss of control power or a defined inactive state should preserve the original connection rather than isolate the signal path.
For PCB implementation, place the device close to the switched nodes to minimize trace resistance and coupling between adjacent channels. Confirm control-pin logic and signal limits against the manufacturer datasheet, and check continuity behavior during power-up. Do not assume that a low on-resistance makes the switch suitable for high-current loads.
This product record combines the exact catalog identity, package, switch configuration, and resistance data with practical guidance for routing, signal integrity, lifecycle review, sourcing, and drop-in replacement evaluation. It also distinguishes the verified device facts from specifications that must be checked in the manufacturer datasheet.
直接替换替代料： DG309CY+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： DG309CY+ （相同外形与封装尺寸） ——差异在于 Mounting Type, On-Resistance, Package, Switch Type, Technology.
DG309A
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
DG309CJ+
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →DG309DY
✅ 直接替换📋 参考替代料（不在目录中）
DG309DY-T1
✅ 直接替换📋 参考替代料（不在目录中）
DG309AD
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
DG309CY+ 最大额定值与电气特性
| Number of Switches | 4 circuits |
| Switch Configuration | 1:1 |
| On-Resistance | 100 ohm |
| Switch Type | Quad SPST |
| Contact State | Normally closed |
| Technology | CMOS analog switch |
| 引脚数 | 16 pins |
| 封装 | 16-SOIC |
| 安装类型 | Surface mount |
| Signal Paths | 4 independent switch channels |
| RoHS 状态 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
DG309CY+ 16-soic 引脚配置指南
DG309CY+（16-soic 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： DG309CY+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DG309CY+ 适用于 6 应用s: Analog Test-Point Multiplexing, Sensor Signal Routing, Communication Path Selection, Data-Acquisition Front Ends, Sample-and-Hold Interface Control, Peripheral and Control-Line Multiplexing.
Analog Test-Point Multiplexing
The DG309CY+ is well suited to routing a measured analog node toward a test instrument because it provides four independent, normally closed SPST paths in a 16-SOIC package. Its 100 ohm on-resistance adds a defined series impedance that should be included in the measurement-path error budget. The normally closed state can also preserve a connection during reset or until the controller explicitly changes the route. Place the IC near the test points to minimize trace capacitance, and verify control levels, leakage, charge injection, and settling time in the manufacturer datasheet.
推荐
Sensor Signal Routing
The DG309CY+ can route one conditioned sensor output among several analog destinations using its four normally closed channels. This arrangement supports programmable instrumentation, selectable inputs, and compact signal-path sharing without introducing mechanical relays. The documented 100 ohm on-resistance must be checked against the sensor source impedance and the allowable measurement error. Designers should also evaluate charge injection, off leakage, control logic, and settling behavior because they can affect low-level or high-impedance sensor measurements.
推荐
Communication Path Selection
The DG309CY+ supports 1:1 routing of low-voltage communication or control lines when the system requires four selectable paths with a normally closed default. A closed default can maintain a link during startup or provide a defined fallback when a controller is inactive. The CMOS switch architecture avoids the mechanical delay and wear associated with a relay, but the design must remain within the verified signal-voltage and bandwidth limits. Confirm switching time, charge injection, and off-channel isolation before using it for high-speed or high-isolation links.
推荐
Data-Acquisition Front Ends
The DG309CY+ can select among multiple external inputs in a compact data-acquisition front end, allowing several conditioned channels to reach a common converter path. Its four normally closed SPST switches provide local routing while the 16-SOIC package keeps the implementation in a standard surface-mount footprint. Because the switch contributes 100 ohm on-resistance, the selected source should have sufficiently low impedance or appropriate gain correction. Input capacitance, channel leakage, switching transients, and control timing must be included in the acquisition error analysis.
推荐
Sample-and-Hold Interface Control
The DG309CY+ can provide selectable connections around a sample-and-hold or measurement-gain stage when the design needs multiple normally closed paths. Keeping the selected route connected by default may simplify reset behavior and reduce ambiguity in fault conditions. The 100 ohm on-resistance should be combined with the switch's effective capacitance when calculating settling time for the connected network. Validate charge injection, control-logic thresholds, and maximum signal amplitude with the manufacturer datasheet before selecting component values around the switch.
推荐
Peripheral and Control-Line Multiplexing
The DG309CY+ is useful for sharing a peripheral input among several control or monitoring sources through four normally closed SPST paths. The normally closed behavior allows a primary source to remain connected until another route is deliberately selected, which can simplify firmware state handling. Because this is an IC signal switch rather than a power device, loads must remain within the verified current and voltage limits. Review off leakage, logic thresholds, switching transients, and package pin assignments in the manufacturer datasheet.
推荐
推荐产品汇总
工程参考数据： DG309CY+ ——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 | DG309A | DG309C | DG309DY | DG309DY-T1 | DG309AD |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Vishay Siliconix | Analog Devices |
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Number of Switches | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
| Switch Configuration | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 | 1:1 |
| Switch Type | Quad SPST | Quad SPST | Quad SPST | Quad SPST | Quad SPST | Quad SPST |
| Contact State | Normally closed | Normally closed | Normally closed | Normally closed | Normally closed | Normally closed |
| Mounting Type | Surface mount | Surface mount | Surface mount | Surface mount | Surface mount | Surface mount |
关键差异点
- Normally closed signal paths （对比 DG309DY-T1)
- Four independent 1:1 routing channels （对比 DG308A)
- Compact 16-SOIC implementation （对比 DG309U)
设计说明
Include the documented 100 ohm on-resistance in the complete source-impedance and gain-error calculation. For a high-impedance sensor or receiver, the switch resistance may be negligible; for a low-impedance source, it can create measurable attenuation or interaction with downstream loading. Also check the switch capacitance, charge injection, and off leakage in the manufacturer datasheet before setting bandwidth and accuracy targets.
Place the DG309CY+ close to the switched nodes and minimize the length of both signal and common traces. Long PCB runs can add resistance, parasitic capacitance, coupling, and ground inductance that degrade the behavior of the nominal 100 ohm switch. Use a continuous ground reference, keep control routing away from sensitive analog paths where practical, and follow the manufacturer layout and bypass recommendations.
Do not treat the DG309CY+ as a general-purpose power switch. Its verified catalog description identifies an IC analog switch with 100 ohm on-resistance, while current, voltage, power, and absolute maximum limits are not established by the listed summaries. Verify signal amplitude, load current, control levels, and temperature limits in the manufacturer datasheet. Also avoid assuming that the four channels have identical application behavior if the routed signals differ substantially in amplitude or frequency.
Define the expected state of every normally closed path during reset, startup, and loss of control activity. If a default connection is intentional, the control circuit must not create an unintended transition or back-power the routed node. Conversely, if isolation is required during reset, use an external pull device or another isolation stage because the switch's default state must be checked against the complete system requirements.
合规信息
The listed product summaries do not explicitly identify RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. Confirm these attributes using the manufacturer product documentation and the traceable lot documentation supplied with a quotation.