MPC509AU/1K - 4:1 Differential Analog Mux | Texas Instruments
MPN: MPC509AU/1K ✓ ActiveMPC509AU/1K Overview
An analog multiplexer is an interface IC that routes one of several analog inputs to an output using digital address and enable controls. Within the interface-IC hierarchy, the MPC509AU/1K is a CMOS switch and multiplexing component. Its differential configuration supports balanced or complementary signals, while its single-ended capability permits eight inputs to be selected when a differential output is not required. Break-before-make switching and no channel interaction during overvoltage improve signal-path integrity.
The principal electrical features include a 16 V supply rating, ±15 V analog input range, 1.5 kOhm on-resistance, 70 V peak-to-peak overvoltage protection, and typical standby power of 7.5 mW. These characteristics make the device suitable for instrumentation, test systems, data acquisition, industrial control, and signal-routing boards where multiple analog sources must share a limited number of downstream converter or measurement channels.
The MPC509AU/1K belongs to the MPC508A and MPC509A family of CMOS analog multiplexers. The MPC509A implements differential multiplexing, while the related MPC508A provides eight-channel single-ended multiplexing. Address decoding determines the selected channel, while enable control connects or isolates the common terminals. The input-protection architecture is specifically intended to limit disturbance on other channels when an analog input exceeds a supply rail.
Typical applications include multiplexed sensor acquisition, automated test equipment, process-control systems, and communication or instrumentation interfaces. In a data-acquisition circuit, the selected differential pair can feed a measuring frontend while unused inputs remain isolated. In industrial equipment, the overvoltage-protection feature adds robustness when external wiring can expose the mux to transients. Designers should still verify signal amplitude, switching timing, and injection-error limits for their particular source impedance and measurement bandwidth.
For a robust design, keep input and output routing away from high-current switching nodes, use a low-impedance return path, and account for the approximately 1.5 kOhm channel resistance when designing amplifier gain. The SOIC package requires adequate spacing between adjacent channels to minimize crosstalk and thermal gradients. System supply sequencing should keep control inputs in defined states whenever an analog input may exceed the supply voltage.
This page combines the verified manufacturer and distributor information for MPC509AU/1K with package, environmental, sourcing, and engineering context. It also distinguishes verified ordering variants from genuinely pin-compatible substitutes, avoiding unsupported claims that a differently packaged or electrically different device is a drop-in replacement.
Drop-in alternatives for MPC509AU/1K — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
MPC509AUG4
✅ Drop-InContact for price
View Datasheet →MPC509AU/1KG4
✅ Drop-In📋 Reference alternative (not in catalog)
MPC509AU/1K Specifications
| Multiplexer Configuration | 4:1 differential |
| Single-Ended Channel Count | 8 channels |
| Differential Channel Count | 4 channels |
| Supply Voltage | 16 V |
| Analog Signal Range | -15 V to +15 V |
| Input Overvoltage Protection | 70 V peak-to-peak |
| On-Resistance | 1.5 kOhm |
| Standby Power | 7.5 mW typical |
| Switching Sequence | Break-before-make |
| Overvoltage Channel Interaction | No channel interaction |
| Package | 16-pin SOIC (DW) |
| Operating Temperature Range | -40°C to 85°C |
| Circuit Count | 2 circuits |
| Mounting Type | Surface mount |
| Logic Family | CMOS |
MPC509AU/1K 16-pin soic (dw) Pin Configuration Guide
Pin configuration for MPC509AU/1K (16-pin soic (dw) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for MPC509AU/1K.
Refer to the datasheet for full pin configuration.
Typical Applications
MPC509AU/1K is suitable for 6 applications: Multiplexed Sensor Acquisition, Automated Test Equipment, Industrial Process Control, Data Acquisition Systems, Battery-Powered Measurement Instruments, Communication and Interface Routing.
Multiplexed Sensor Acquisition
MPC509AU/1K fits sensor-frontend designs that must route several analog measurements into one processing channel. Its four differential input pairs can carry complementary sensor outputs while four single-ended selections are also available. The verified 1.5 kOhm on-resistance must be included in the acquisition-chain error budget, especially with high-impedance sensors. A practical arrangement places the mux close to the sensors, shields each channel, and follows it with a high-input-impedance amplifier. The 70 V peak-to-peak overvoltage protection and no-channel-interaction behavior improve robustness when sensor wiring is exposed to industrial transients.
Recommended
Automated Test Equipment
MPC509AU/1K is appropriate for automated test equipment that scans multiple low- to moderate-impedance analog sources through a shared measurement path. The 4:1 differential architecture reduces the number of downstream converters or amplifiers required, while the ±15 V signal range supports many industrial and laboratory sources. Break-before-make switching helps prevent output transients during address transitions. The principal design constraint is the 1.5 kOhm on-resistance: calibration should include the actual mux path, source impedance, and input capacitance. Verified overvoltage protection is also useful when switching test points that may exceed the local supply rails.
Recommended
Industrial Process Control
MPC509AU/1K can consolidate pressure, temperature, and controller feedback signals in an industrial process-control board. Differential pairing helps reject common-mode noise when the multiplexed source is balanced, and the -40°C to 85°C range suits many factory environments. Its 70 V peak-to-peak input protection can reduce fault energy reaching the switching core, but external clamps and surge suppression may still be required for severe industrial transients. Engineers should use short traces, a continuous ground plane, and separate analog routing from relays, motors, and switching power stages. The 1.5 kOhm path resistance must be included in closed-loop gain calculations.
Recommended
Data Acquisition Systems
MPC509AU/1K supports compact data-acquisition systems that need to scan more sources than the available converter channels. Four differential channels or eight single-ended channels can be routed into a common analog front end, reducing connector count and board area. The 16 V supply and ±15 V analog range suit many sensor and instrumentation signals. However, the 1.5 kOhm on-resistance may require source buffering when driving high-impedance dividers or long cable runs. For repeatable measurements, characterize offset and gain with the mux in-circuit and use break-before-make address transitions to avoid command transients during channel changes.
Recommended
Battery-Powered Measurement Instruments
MPC509AU/1K can reduce the number of analog inputs required in portable measurement instruments while remaining compatible with a 16 V supply architecture. The typical standby power of 7.5 mW is useful when the device is disabled between measurements, although the complete system budget also includes address-driver and leakage currents. Select a low-leakage source network and ensure the selected source can tolerate the 1.5 kOhm on-resistance without degrading accuracy. The SOIC package is suitable for conventional portable-instrument layouts, but it is larger than modern miniature packages. Grounding and guarding remain important because mux transitions can couple into adjacent low-energy sensor channels.
Recommended
Communication and Interface Routing
MPC509AU/1K is useful in interface-routing boards that connect several balanced or unbalanced analog lines to a common communication or measurement endpoint. Differential multiplexing helps preserve signal relationships, while break-before-make operation reduces the chance of momentarily shorting adjacent switched paths. The verified no-channel-interaction behavior under overvoltage is especially helpful where one external line can become abnormal while other channels remain active. A robust implementation should include controlled address states, defined logic levels during power transitions, and separate return paths for each channel. Engineers should also verify bandwidth and injection error against the actual line impedance and cable length.
Recommended
Recommended Products Summary
Engineering reference data for MPC509AU/1K — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MPC509AUG4 | MPC509AU/1KG4 |
|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) - same package | 16-SOIC (DW) - same package |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Multiplexer Configuration | 4:1 differential | 4:1 differential | 4:1 differential |
| Differential Channel Count | 4 channels | 4 channels | 4 channels |
Key Differentiators
- Verified input overvoltage protection (vs MPC509AUG4)
- Confirmed analog operating range (vs MPC509AUG4)
- Documented switched-path resistance (vs MPC509AU/1KG4)
Design Notes
Include the 1.5 kOhm on-resistance in the complete source-to-receiver transfer calculation. Estimated: with a 10 kOhm receiver and negligible source impedance, the mux path alone would create approximately 13% voltage attenuation; exact loss also depends on switch capacitance, bandwidth, and source impedance. Use short traces, a continuous ground plane, and a nearby low-impedance input amplifier when channel accuracy or high-frequency response is important.
Do not treat the 70 V peak-to-peak overvoltage rating as permission to apply arbitrary transients. Verify the manufacturer absolute maximum ratings, input current limits, and application conditions before using the protection feature in a field-wired system. Add external surge and ESD protection when cables can leave the enclosure, and ensure address and enable logic never remain in an undefined state during power-up or power-down.
Place the mux close to the analog source connector or protected sensor interface to minimize susceptible trace length. Route each selected channel over a continuous ground reference, maintain spacing from relay contacts, switching-regulator inductors, and digital clock lines, and avoid sharing narrow return paths between analog inputs. If the board contains motor, display, or power-converter switching stages, use separate analog and power-ground regions and join them at a controlled low-impedance point.
Compliance Information
No explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statement was present in the supplied verified data. Compliance must be confirmed using the current Texas Instruments material-declaration record for the exact ordering code.