MPC508AU - 8:1 Analog Multiplexer, 16V | Texas Instruments
料号： MPC508AU ✓ 量产中MPC508AU 概述
An analog multiplexer is a switching network that allows a system to share a single analog-to-digital converter, measurement amplifier, or signal-processing channel among multiple inputs. The MPC508AU belongs to the hierarchy of analog switch ICs, multiplexers, signal-selection devices, and semiconductor interface components. Its eight-channel single-ended architecture is useful where several voltage or current sources must be inspected sequentially without duplicating the downstream measurement circuitry.
The MPC508AU provides analog overvoltage protection rated at 70 Vpp, allowing an input signal to exceed the device power-supply voltages without damaging the multiplexer or disturbing the other channels. According to the manufacturer datasheet, this protection maintains signal fidelity and prevents channel interaction during an overvoltage condition. Its specified analog signal range is ±15 V, while the associated power-supply capability supports dual-supply operation.
Break-before-make switching prevents two channels from conducting simultaneously during a transition, which is important when the multiplexer connects sources with different voltages. Typical standby power is 7.5 mW, making the device suitable for instrumentation and test systems in which channel-selection overhead should remain small. The device is also identified as a true second source, an important supply-chain consideration for long-lived industrial and instrumentation programs.
Typical uses include data-acquisition systems, automated test equipment, analog measurement front ends, signal routing between sensors and a common amplifier, and laboratory or process-control interfaces. The 1.5 kOhm on-resistance listed by DigiKey is adequate for many high-impedance sensing tasks, although source impedance and settling behavior must be evaluated when the selected channel is connected.
A practical design consideration is to keep the selected signal path short and to place protection and conditioning components near the multiplexer inputs. Because the part provides input overvoltage protection rather than unlimited transient clamping, engineers should still verify the maximum expected signal amplitude and ensure that supply sequencing matches the operating requirements described in the datasheet.
This page consolidates verified distributor specifications, manufacturer product information, package details, pricing, drop-in alternatives, and application guidance. It also distinguishes documented device characteristics from parameters that require confirmation against the latest manufacturer datasheet before release.
直接替换替代料： MPC508AU ——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： MPC508AU （相同外形与封装尺寸） ——差异在于 Package, Mounting Type, Lead-Free Status, Number of Channels, On-Resistance.
MPC508AP
✅ 直接替换联系询价
查看数据手册 →MPC508AUG4
✅ 直接替换联系询价
查看数据手册 →MPC508AU 规格参数
| Multiplexer Configuration | 8:1 |
| Number of Channels | 1 circuit |
| Signal Architecture | 8-channel single-ended |
| 电源电压 | 16 V |
| Analog Signal Range | ±15 V |
| On-Resistance | 1.5 kOhm typical |
| Typical On-Resistance | 1300 Ohm |
| Analog Overvoltage Protection | 70 Vpp |
| Switching Mode | Break-before-make |
| Channel Interaction During Overvoltage | None |
| Standby Power | 7.5 mW typical |
| 封装 | 16-pin SOIC (DW) |
| 安装类型 | Surface mount |
| Dual Power-Supply Range | ±5 V to ±22 V |
| Single Power-Supply Options | 5 V, 12 V or 16 V |
| Qualification | True second source |
MPC508AU 16-pin soic (dw) 引脚配置指南
MPC508AU（16-pin soic (dw) 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： MPC508AU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MPC508AU 适用于 6 应用s: Multiplexed Data-Acquisition Front End, Automated Test Equipment Signal Routing, Industrial Sensor Signal Multiplexing, Bench Instrument Analog Input Selection, Process-Control Analog Channel Selection, Legacy Instrumentation Upgrade Path.
Multiplexed Data-Acquisition Front End
The MPC508AU is appropriate for data-acquisition systems that must scan eight single-ended sensor or test-point voltages through one measurement channel. Its 8:1 configuration replaces eight separate analog switches and their support components, while the 1300 Ohm typical on-resistance is practical when the source impedance is substantially higher. The 70 Vpp analog overvoltage protection can limit disturbance of other channels if one input exceeds the supply rails. Engineers should still evaluate channel settling, source impedance, and acquisition time after each address change. Break-before-make operation also prevents two externally sourced voltages from being momentarily tied together.
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Automated Test Equipment Signal Routing
The MPC508AU can select among eight test points in automated test equipment where one shared measurement amplifier or ADC front end must inspect multiple DUT nodes. The single-ended 8:1 arrangement keeps the control interface compact and reduces the number of external analog paths. Its 7.5 mW typical standby power is helpful in multi-channel fixtures, while break-before-make switching protects the DUT from an unintended momentary connection between two test nodes. The 1.5 kOhm rated on-resistance should be checked against the fixture impedance, cable capacitance, and required settling time for accurate measurements.
推荐
Industrial Sensor Signal Multiplexing
The MPC508AU fits industrial systems that monitor pressure, temperature, position, or level through multiple analog sensor channels. Its specified ±15 V analog range accommodates bipolar sensor signals, and the 70 Vpp overvoltage protection provides isolation between channels when one input is driven beyond the supply rails. The 16-pin SOIC package simplifies assembly on conventional industrial control boards. In safety- or process-monitoring designs, engineers should add external clamping for severe surge events and confirm the complete channel leakage, off-isolation, and settling characteristics in the datasheet.
推荐
Bench Instrument Analog Input Selection
The MPC508AU can connect eight laboratory sources to a common amplifier, oscilloscope input, or measurement receiver in a bench instrument. Its break-before-make switching avoids cross-connecting sources during range or channel changes, and the 70 Vpp protection rating adds robustness when a source is temporarily driven above the supply voltage. The 1.5 kOhm on-resistance is acceptable for many high-impedance instruments but can create settling errors with long cables or low source resistance. Place protection close to the input pins and use short, guarded routing to preserve measurement accuracy.
推荐
Process-Control Analog Channel Selection
The MPC508AU is suitable for process-control equipment that must monitor several analog process inputs while using a shared controller or transmitter. The eight-channel single-ended organization provides a practical way to expand a controller's analog input count, and the ±15 V signal range supports widely used industrial voltage signals. Its low 7.5 mW typical standby contribution reduces the power burden of multi-card installations. For long field wiring, however, overvoltage protection should be supplemented by external surge suppression, and the input common-mode and ground arrangement must follow the datasheet's application guidance.
推荐
Legacy Instrumentation Upgrade Path
The MPC508AU is useful for maintaining or replicating legacy instrumentation architectures that depend on a 16-pin CMOS 8:1 multiplexer. The documented 70 Vpp overvoltage protection, break-before-make switching, and second-source status help reduce sourcing risk in long-lived systems. When replacing a discontinued part, engineers should compare the full pin diagram rather than relying only on the 8:1 designation, because address polarity, enable logic, and supply arrangements can differ among multiplexers with similar channel counts. The SOIC-16 footprint also supports conventional through-hole and mixed-technology assembly practices.
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推荐产品汇总
工程参考数据： MPC508AU ——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 | MPC508AP | MPC508AUG4 |
|---|---|---|---|
| Package | SOIC-16 (DW) | SOIC-16 - same | SOIC-16 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Multiplexer Configuration | 8:1 | 8:1 | 8:1 |
| Signal Architecture | 8-channel single-ended | 8-channel single-ended | 8-channel single-ended |
| Nominal Supply Voltage | 16 V | 16 V | 16 V |
| Typical On-Resistance | 1300 Ohm | 1300 Ohm | 1300 Ohm |
| Analog Signal Range | ±15 V | ±15 V | ±15 V |
| Analog Overvoltage Protection | 70 Vpp | 70 Vpp | 70 Vpp |
关键差异点
- Eight single-ended channels with overvoltage isolation （对比 MPC508AP)
- Documented protection against channel interaction （对比 MPC508AUG4)
- Break-before-make signal-path protection （对比 MPC508AP)
- Low standby consumption for multiplexed instrumentation （对比 MPC508AUG4)
设计说明
Do not treat the MPC508AU's 70 Vpp input-overvoltage protection as a substitute for external surge protection. The documented feature prevents an overvoltage from damaging the multiplexer or disturbing other channels, but long cables and field wiring can present much larger transients. Add suitable series impedance and external clamping ahead of the pins, and verify that the protection network does not distort the ±15 V analog signal range or degrade accuracy at the measurement bandwidth.
Keep the selected analog path short and account for the 1300 Ohm typical on-resistance when budgeting error and settling time. With a finite switch resistance, cable capacitance and source impedance form an RC network whose settling period can be significant at high measurement rates. Use a high-impedance buffer downstream, minimize routing capacitance, and issue the channel-selection address early enough to allow the acquisition system to settle before sampling.
Use separate input and bypass capacitors close to the supply pins, following the manufacturer datasheet's recommended values and layout. The MPC508AU's 7.5 mW typical standby power is low, but it does not remove the need for local decoupling because multiplexers can couple supply noise and switching transients into a high-impedance measurement chain. Keep the bypass return path close to the device ground reference and avoid sharing long return paths with switching-power nodes.
Preserve the break-before-make behavior electrically by ensuring that only one channel-select address is asserted at a time and that address-transition blanking is long enough for the previous channel to open before the next closes. Avoid routing sensitive multiplexer inputs next to digital address lines or high-current switching nodes. Where possible, use a ground guard around the common output and provide a defined, low-impedance analog ground reference to minimize injected channel error.
合规信息
The supplied verified results do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is marked not applicable because this legacy CMOS analog interface IC is not presented as an automotive-qualified device in the verified data. Confirm current compliance declarations with Texas Instruments before release.