DG403CY+ - Dual High-Speed SPDT Analog Switch | Analog Devices
料号： DG403CY+ ✓ 量产中DG403CY+ 概述
An analog switch is a semiconductor device that routes an analog signal between circuit nodes under digital control. Unlike a mechanical relay, it provides faster switching and compact solid-state construction. The DG403 belongs to the SPDT switch hierarchy: each of its two channels connects one common terminal to one of two switched terminals, allowing a source to select between two destinations. This makes the device suitable for test equipment, signal-chain routing, instrumentation, and data-acquisition systems.
Key characteristics include a maximum on-resistance of 45 ohms, guaranteed on-resistance matching of 2 ohms maximum, guaranteed on-resistance flatness of 3 ohms maximum, and charge injection of 15 pC maximum. The redesigned DG403 family also provides low off leakage below 5 nA at +85°C. These characteristics help limit signal attenuation, channel-to-channel resistance variation, transient switching errors, and leakage into sensitive measurement nodes.
The DG403CY+ uses independent control inputs to operate its two SPDT channels, with operation supported by positive and negative supply rails. Equal on-resistance in both directions makes the switch useful for bidirectional paths, including instrumentation, automated test, data acquisition, and signal-conditioning systems. The 16-pin NSOIC package supports conventional surface-mount PCB assembly, while its two-channel architecture reduces the number of discrete switches required for dual-path routing.
Typical applications include multiplexed sensor acquisition, oscilloscope and measurement-instrument signal routing, automated test equipment, sample-and-hold systems, and industrial control modules. The low charge-injection specification is particularly useful when the switched node feeds a high-impedance amplifier because it limits the control-induced voltage transient that could otherwise disturb a measurement.
When laying out a board, keep the common and switched signal traces short, provide a low-impedance return path, and place supply-bypass capacitors near the device. Avoid routing high-impedance signals beside digital control traces, and account for the 45-ohm maximum on-resistance when designing voltage dividers, termination networks, or gain stages. Verify the exact pin mapping and recommended application circuit in the Analog Devices DG403 data sheet before layout release.
This page combines manufacturer specifications, replacement guidance, application analysis, and practical implementation notes. It also distinguishes same-footprint upgrades from cross-package options so engineers can identify realistic drop-in choices without treating every functionally similar switch as a direct replacement.
直接替换替代料： DG403CY+ ——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： DG403CY+ （相同外形与封装尺寸） ——差异在于 Off Leakage Current, On-Resistance Flatness, On-Resistance Matching, Package, Charge Injection.
DG403DY+
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →DG403DY
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
DG403DYZ+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
DG403CY+ 最大额定值与电气特性
| Number of Switch Channels | 2 channels |
| Switch Architecture | 2 x SPDT |
| Maximum On-Resistance | 45 ohm |
| Typical On-Resistance | 20 ohm |
| On-Resistance Matching | 2 ohm maximum |
| On-Resistance Flatness | 3 ohm maximum |
| Maximum Charge Injection | 15 pC |
| Off Leakage Current | <5 nA at +85°C |
| Positive Supply Voltage Range | 4.5 V to 20 V |
| Negative Supply Voltage Range | -20 V to -4.5 V |
| Signal Direction | Bidirectional |
| 封装 | 16-pin NSOIC |
| 安装类型 | Surface Mount |
DG403CY+ 16-pin nsoic 引脚配置指南
DG403CY+（16-pin nsoic 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： DG403CY+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DG403CY+ 适用于 6 应用s: Automated Test Equipment Signal Routing, Data Acquisition Multiplexing, Precision Instrumentation Signal Selection, Sensor Signal Conditioning, Oscilloscope and Measurement Front Ends, Sample-and-Hold Signal Paths.
Automated Test Equipment Signal Routing
The DG403CY+ fits automated test systems that must route one measurement source to two different DUT or instrument paths. Its two independent SPDT channels provide separate routing decisions, while the 45-ohm maximum on-resistance is suitable when it is included in the measurement-path impedance budget. The 20-ohm typical resistance helps engineers estimate nominal insertion loss before selecting gain and termination values. Because the switches conduct in either direction, the same device can route stimulus and return signals. Allow settling time after each transition because the 15 pC maximum charge injection can create a transient in high-impedance nodes.
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Data Acquisition Multiplexing
The DG403CY+ is useful in data-acquisition front ends that alternate a common measurement node between two signal sources. A 45-ohm maximum on-resistance adds a controlled series impedance that must be included when calculating the effective transfer function with sensor and amplifier impedances. Its bidirectional conduction supports source selection without separate direction-dependent devices. The low off leakage below 5 nA at +85°C helps reduce errors at high-impedance sensor nodes, while 15 pC maximum charge injection should be considered when sampling immediately after switching. The 16-pin NSOIC package simplifies compact, surface-mount instrument layouts.
推荐
Precision Instrumentation Signal Selection
The DG403CY+ supports precision instrument signal selection where one amplifier or measurement channel must connect to different input networks. Its 45-ohm maximum on-resistance and 2-ohm maximum on-resistance matching help limit insertion-loss variation between the two switched paths, while 3-ohm maximum flatness limits resistance changes over the signal range. These characteristics are important when gain calibration assumes repeatable path behavior. Place the switch close to the protected input, maintain a quiet ground reference, and allow the measurement system to settle after each transition to avoid interpreting charge injection as a real input change.
推荐
Sensor Signal Conditioning
The DG403CY+ can select between sensor outputs or signal-conditioning paths in compact industrial modules. Its bidirectional switching behavior is useful for resistive, bridge, or voltage-sensing networks, provided the 45-ohm maximum on-resistance is acceptable in the sensor path. The off leakage below 5 nA at +85°C limits disturbance at high-impedance nodes, and the low 15 pC maximum charge injection helps reduce control transients. Use a single ground reference across the switch and analog section, place bypass capacitors close to the supply pins, and avoid placing fast digital control traces beside sensitive sensor inputs.
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Oscilloscope and Measurement Front Ends
The DG403CY+ is appropriate for oscilloscope-adjacent and laboratory measurement circuits requiring fast selection between two signal paths. Its dual high-speed SPDT architecture supports channel routing, probe selection, or input isolation without using separate relays for each path. The nominal 20-ohm typical on-resistance and 45-ohm maximum on-resistance should be included in probe compensation and attenuator design. The 15 pC maximum charge injection is especially relevant when the selected source drives a high-impedance vertical input. Keep signal routing short, maintain a continuous return plane, and schedule the first valid acquisition after the control transient has settled.
推荐
Sample-and-Hold Signal Paths
The DG403CY+ can implement signal selection in sample-and-hold systems where the input source changes between acquisition intervals. The dual SPDT arrangement allows two source paths to be prepared before the acquisition sequence, while the 45-ohm maximum on-resistance contributes to source impedance and settling behavior. Charge injection of 15 pC maximum creates a transient proportional to the switched node capacitance, so the held capacitor and sampling amplifier must be sized for adequate recovery time. The device's bidirectional conduction also permits routing in either signal direction, simplifying instrumentation around the hold stage.
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推荐产品汇总
工程参考数据： DG403CY+ ——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 | DG403DY+ | DG403DY | DG403DYZ+ | DG403DJ |
|---|---|---|---|---|---|
| Package | 16-pin NSOIC | 16-pin NSOIC - same | 16-pin NSOIC - same | 16-pin NSOIC - same | 16-pin NSOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 2 | 2 | 2 | 2 | 2 |
| Switch Architecture | 2 x SPDT | 2 x SPDT | 2 x SPDT | 2 x SPDT | 2 x SPDT |
| Maximum On-Resistance | 45 ohm | 45 ohm | 45 ohm | 45 ohm | 45 ohm |
| Typical On-Resistance | 20 ohm | 20 ohm | 20 ohm | 20 ohm | 20 ohm |
| Maximum Charge Injection | 15 pC | 15 pC | 15 pC | 15 pC | 15 pC |
| Positive Supply Voltage Range | 4.5 V to 20 V | 4.5 V to 20 V | 4.5 V to 20 V | 4.5 V to 20 V | 4.5 V to 20 V |
| Negative Supply Voltage Range | -20 V to -4.5 V | -20 V to -4.5 V | -20 V to -4.5 V | -20 V to -4.5 V | -20 V to -4.5 V |
| Off Leakage Current | <5 nA at +85°C | <5 nA at +85°C | <5 nA at +85°C | <5 nA at +85°C | <5 nA at +85°C |
关键差异点
- Dual high-speed SPDT routing in one 16-pin package （对比 DG403DY+)
- Guaranteed channel matching supports repeatable path selection （对比 DG403DY)
- Low leakage supports high-impedance signal paths （对比 DG403DYZ+)
- Bidirectional conduction simplifies signal-path planning （对比 DG403DJ)
设计说明
Route common, switched, and control traces as short as practical, and place the device near the source or protected input rather than at the edge of the PCB. Keep the analog return current within the same reference plane and avoid crossing control routes beneath high-impedance inputs. The switch conducts equally well in either direction, but short traces are still necessary to minimize parasitic inductance, capacitive pickup, and additional settling time.
Do not treat the 20-ohm typical on-resistance as a design guarantee; use the 45-ohm maximum value in voltage-divider, termination, and gain calculations. Likewise, include the 15 pC maximum charge injection when sizing the switched node capacitance or determining the settling interval for a high-impedance amplifier. Recheck polarity and supply limits because the device supports bipolar rails of 4.5 V to 20 V magnitude.
Follow the manufacturer's recommended positive and negative bypass-capacitor configuration, placing each capacitor close to its corresponding supply pin. Keep supply-return connections compact to reduce parasitic inductance and ensure that control-input levels remain valid under the selected supply combination. Decoupling does not substitute for correct rail sequencing: both rails should remain inside their specified limits throughout startup and shutdown.
For high-impedance signals, minimize board leakage and avoid placing the switch next to switching regulators or high-current return paths. Account for both off leakage below 5 nA at +85°C and the 15 pC maximum charge injection. A practical settling strategy is to change the switch state, allow the control transient to decay, and then initiate acquisition. The required delay depends on node capacitance, source impedance, amplifier bandwidth, and measurement accuracy.
合规信息
The manufacturer product page identifies the DG403 family as production. Specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals statements were not identified for the DG403CY+ ordering code in the cited information.
