LDC3114QPWR - 4-Ch Inductance-to-Digital Touch Sensor | TI
MPN: LDC3114QPWR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.8 | $2.80 |
| 10 | $2.55 | $25.50 |
| 100 | $2.25 | $225.00 |
| 500 | $2 | $1,000.00 |
| 1,000 | $1.8 | $1,800.00 |
Drop-in alternatives for LDC3114QPWR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LDC3114QPWRQ1
β Drop-Inβ In Stock
$1.4 / Unit
View Datasheet βLDC1314QPWR
β Drop-Inπ Reference alternative (not in catalog)
LDC1314QPWRQ1
β Drop-Inπ Reference alternative (not in catalog)
LDC1614QPWR
β Drop-Inπ Reference alternative (not in catalog)
LDC1614QPWRQ1
β Drop-Inπ Reference alternative (not in catalog)
LDC3114QPWR Maximum Ratings & Electrical Characteristics
| Number of Channels | 4 |
| Function | 4-Channel Hybrid Inductive Touch and Inductance to Digital Converter |
| Interface | I2C |
| Operating Temperature | -40C to +125C |
| Package | 16-TSSOP (PW) |
| Mounting Type | Surface Mount |
| Low Power Mode | Yes (ultra-low power mode for battery applications) |
| Configuration | I2C register configuration |
| Applications | Proximity and touch-button sensing |
| Supplier Device Package | PW (TSSOP-16) |
| Category (DigiKey) | ADCs/DACs - Special Purpose |
| Unit Price (qty 1, LCSC) | 2.8048 USD as of 2026-09-04 |
LDC3114QPWR Pin Configuration
| Pin 1 | INA0 β Channel 0 coil drive terminal A (external LC tank) |
| Pin 2 | INB0 β Channel 0 coil drive terminal B (external LC tank) |
| Pin 3 | INA1 β Channel 1 coil drive terminal A (external LC tank) |
| Pin 4 | INB1 β Channel 1 coil drive terminal B (external LC tank) |
| Pin 5 | GND β Ground reference |
| Pin 6 | ADDR β I2C address selection input |
| Pin 7 | SCL β I2C serial clock |
| Pin 8 | SDA β I2C serial data |
| Pin 9 | SD β Shutdown control input |
| Pin 10 | INTB β Interrupt output (active low) |
| Pin 11 | INB2 β Channel 2 coil drive terminal B (external LC tank) |
| Pin 12 | INA2 β Channel 2 coil drive terminal A (external LC tank) |
| Pin 13 | INB3 β Channel 3 coil drive terminal B (external LC tank) |
| Pin 14 | INA3 β Channel 3 coil drive terminal A (external LC tank) |
| Pin 15 | VDD β Power supply |
| Pin 16 | VDD β Power supply |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LDC3114QPWR is suitable for 6 applications: Sealed Touch Buttons in Appliances, Battery-Powered Proximity Buttons, Industrial Control Panels and HMI, Rotary and Linear Position Sensing, Metal-Target Proximity Detection, Automotive Body and Cabin Controls.
Sealed Touch Buttons in Appliances
The LDC3114QPWR enables inductive touch buttons behind fully sealed plastic, glass, or stainless panels, where water, steam, and contamination would disable capacitive sensors. Each of its 4 channels drives an external coil and capacitor, detecting the flex of a metal foil target when a user presses the panel, so the front surface carries no electrodes and no seams. The integrated button-detection processing delivers a clean pushbutton output over I2C without heavy host firmware, and the ultra-low power mode suits mains-sparing and battery-backed controls. With -40C to +125C operation, the part survives oven-adjacent and outdoor appliance environments reliably.
Recommended
Battery-Powered Proximity Buttons
In battery-operated devices such as meter interfaces, wearable controls, and portable instrument front panels, the LDC3114QPWR's ultra-low power mode - explicitly intended by TI for power on/off buttons in battery-powered applications - keeps average current draw minimal while remaining wake-capable on target approach. A single channel monitors a small PCB coil acting as the button sensor, and the INTB interrupt output wakes the host MCU only when a detection threshold is crossed, eliminating continuous polling. The 16-TSSOP package fits compact two-sided boards, and the I2C bus is shared with other low-power peripherals to minimize pin count and quiescent overhead.
Recommended
Industrial Control Panels and HMI
Industrial human-machine interfaces benefit from the LDC3114QPWR's four channels for multi-button keypads or combined button-plus-proximity layouts, all handled by one IC on the I2C bus. The -40C to +125C operating range covers unconditioned factory floors and outdoor enclosures, and inductive sensing tolerates the oil, dust, and gloves common in manufacturing settings. Channel-by-channel threshold registers let engineers tune each button's sensitivity independently to accommodate different panel thicknesses and target geometries, while the hybrid architecture supports both discrete button detection and continuous inductance readout for slider-style inputs on the same silicon.
Recommended
Rotary and Linear Position Sensing
For knob rotation, slider travel, or lid-position detection, the LDC3114QPWR measures continuous inductance changes as a metal target moves relative to a coil. A shaped copper coil on the PCB, paired with a metal vane or dial target, produces a monotonic inductance shift that the converter digitizes; firmware maps the channel codes to angle or displacement. This contactless approach eliminates potentiometer wear and hall-magnet assembly cost. Typical implementations use one or two channels per axis, leaving remaining channels for additional buttons, and the I2C data path integrates naturally with motor-control MCUs such as the C2000 family.
Recommended
Metal-Target Proximity Detection
The LDC3114QPWR functions as a compact inductive proximity switch: a coil behind the housing senses the approach of any conductive target - steel, aluminum, or copper - without contact. Compared with discrete LC oscillator proximity circuits, the LDC3114 provides digitized, temperature-compensated channel data with programmable thresholds and an interrupt output, simplifying discrimination between approach events and drift. Four channels allow a single IC to monitor multiple sensing points or implement redundancy in safety-adjacent interlocks. The wide -40C to +125C range and small TSSOP-16 footprint suit door-interlock sensors, position verification, and machine-guard sensing modules on shared PCBs.
Recommended
Automotive Body and Cabin Controls
For automotive touch controls - HVAC buttons, door-handle sensing, and console switches - the pin-compatible AEC-Q100-qualified LDC3114QPWRQ1 supports designs requiring automotive qualification while sharing the identical footprint, allowing one PCB layout to serve both commercial and automotive builds. Inductive buttons survive glove operation, moisture, and cleaning chemicals that challenge capacitive surfaces. The 4-channel density consolidates a complete button cluster onto one I2C device, and the ultra-low power mode supports always-on wake buttons that must not drain the battery during key-off conditions, meeting typical automotive standby-current budgets.
Recommended
Recommended Products Summary
Engineering reference data for LDC3114QPWR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LDC3114QPWRQ1 | LDC1314QPWR | LDC1614QPWR | LDC1614QPWRQ1 |
|---|---|---|---|---|---|
| Package | 16-TSSOP (PW) | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Sensing Channels | 4 | 4 | 2 | 4 | 4 |
| Interface | I2C | I2C | I2C | I2C | I2C |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Automotive Qualification | No | Yes (AEC-Q100) | No | No | Yes (AEC-Q100) |
| Ultra-Low Power Mode | Yes | Yes | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Primary Use Case | Touch buttons + proximity | Touch buttons + proximity (automotive) | 2-channel touch/proximity | High-resolution position sensing | High-resolution position sensing (automotive) |
| Approx. Unit Price (qty 1) | $2.80 as of 2026-09-04 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Four channels of hybrid touch + inductance measurement in one IC (vs LDC1314QPWR)
- Integrated button-detection processing offloads the host MCU (vs LDC1614QPWR)
- Identical footprint with an automotive-grade sibling (vs LDC3114QPWRQ1)
Design Notes
Route each channel's INA/INB pair to the external LC tank as short, symmetric traces, and keep the coil clear of solid ground pour - a continuous plane beneath the sensor coil increases parasitic capacitance, lowers resonant Q, and reduces sensitivity. Per the TI datasheet, each channel needs only one external coil and capacitor; place the tank capacitor within a few millimeters of the device pins. Reserve keep-out areas around all four coils so that unrelated copper, screws, or enclosure metal do not create parasitic targets that shift the baseline.
Decouple VDD with a 0.1uF ceramic capacitor placed close to the supply pin, and share a single quiet analog-derived rail with the I2C pull-up bus where possible. In battery designs, exploit the ultra-low power mode plus the INTB interrupt output so the host MCU sleeps between detection events instead of polling channel registers over I2C - this is the intended TI usage pattern for battery-powered power on/off buttons. Use the SD (shutdown) pin to gate the sensor entirely during system sleep for the lowest possible standby current.
Two frequent integration errors: (1) configuring channel threshold registers with default values rather than calibrating per-button after mechanical assembly - panel thickness and target distance change the baseline code substantially, so perform end-of-line calibration and store thresholds in host EEPROM; (2) mismatching part suffixes in production - the commercial LDC3114QPWR is not AEC-Q100 qualified, so automotive builds must specify LDC3114QPWRQ1 on the BOM even though the footprint is identical. Verify compliance data on TI.com's Quality & Ordering page before release.
Compliance Information
Compliance status for the commercial LDC3114QPWR was not present in the retrieved data; verify on TI.com Quality & Ordering page. The Q1 variant (LDC3114QPWRQ1) is the automotive-qualified option.
