PIC16LC923T-04/PT - 8-Bit MCU, 7KB OTP, LCD Driver | Microchip
MPN: PIC16LC923T-04/PT ✓ ActivePIC16LC923T-04/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, a small amount of program and working memory, and a set of on-chip peripherals. MCU architectures sit within the larger category of embedded microcontrollers -> microcomputers -> semiconductors. The PIC16C/PIC16LC family from Microchip is the classic RISC-based 8-bit line, and the 'LC' suffix indicates a low-voltage (2.5V minimum) CMOS variant suitable for battery-powered applications. The '923T' member additionally integrates an on-chip LCD driver, which is the rarest feature in this family and the primary reason engineers select this part.
Key features include 35 single-word instructions, all executing in a single instruction cycle (500 ns at 4 MHz) except program branches, eight general-purpose registers for fast context switching, and the integrated LCD controller that supports multiplexed glass displays up to 4 backplanes. The device operates from 2.5V to 6V, includes Power-on Reset (POR), Watchdog Timer (WDT), PWM, and supports I2C and SPI serial connectivity. Its 64-pin TQFP package provides generous I/O access for keypad scanning, LCD segment driving, and glue logic.
Technically, the PIC16LC923 implements a Harvard architecture with separated program and data buses, enabling simultaneous instruction fetch and operand access. The OTP program memory is factory- or field-programmable using a device programmer and cannot be erased afterward, which makes this part economical for medium-volume production runs where code is finalized. The 'T' suffix denotes tape-and-reel packaging at the assembly level.
Typical applications include low-power LCD-based consumer appliances, handheld meters and gauges, thermostat and HVAC control panels, industrial sensor readouts with on-glass display, and battery-powered instrumentation where the integrated LCD driver eliminates the need for an external segment driver IC. The 2.5V minimum VDD also makes it suitable for two-AA-cell designs.
When designing with this part, observe the OTP memory constraint: code changes during development are not possible after programming. Develop prototypes on the windowed (UV-erasable) PIC16LC923-04/W or the flash-based PIC16F variant during development, then port to the OTP version for production to control unit cost.
This page synthesizes distributor pricing, drop-in PIC16LC923 family alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers and procurement teams evaluate the part against current alternatives and lifecycle status as of September 2026.
Drop-in alternatives for PIC16LC923T-04/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
PIC16LC923-04/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC923T-04I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC923-04I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC923T-04/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Family | PIC16C |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 176 bytes |
| Maximum CPU Frequency | 4 MHz |
| Instruction Cycle Time | 500 ns (single cycle, except branches) |
| Instruction Set | 35 single-word instructions |
| Supply Voltage (VDD) | 2.5 V to 6.0 V |
| Integrated LCD Driver | Yes (multiplexed, up to 4 backplanes) |
| Communication Interfaces | I2C, SPI |
| Peripherals | LCD, POR (Power-on Reset), PWM, WDT (Watchdog Timer) |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
PIC16LC923T-04/PT 64-tqfp (10x10 mm) Pin Configuration Guide
Pin configuration for PIC16LC923T-04/PT (64-tqfp (10x10 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC16LC923T-04/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16LC923T-04/PT is suitable for 6 applications: Battery-Powered LCD Appliance Control, Thermostat and HVAC Control Panel, Handheld Digital Multimeter, Industrial Sensor Readout with On-Glass Display, Automotive Dashboard Accessory Gauges, Medical Infusion Pump Front Panel.
Battery-Powered LCD Appliance Control
The PIC16LC923T-04/PT is well matched to battery-powered household appliances such as coffee makers, rice cookers, and kitchen timers because it operates from 2.5 V to 6 V and integrates an LCD segment driver that eliminates the external HT1621 or similar driver IC. At 2.5 V VDD it starts cleanly on two discharged AA cells, and the integrated LCD controller drives multiplexed glass displays up to 4 backplanes. The 7 KB OTP memory holds full applets for menu state, timer logs, and sensor calibration, while the 4 MHz instruction rate keeps active-mode current low. Use it as the single-chip brain with keypad, thermistor, and segmented LCD on a 2- or 3-AA-cell supply.
Recommended
Thermostat and HVAC Control Panel
The PIC16LC923T-04/PT fits HVAC wall thermostats because the integrated LCD driver supports the typical 3- or 4-backplane glass display used for setpoint, mode, and fan-speed readouts, while 8-bit GPIO and I2C connect to the temperature/humidity sensor (e.g., SHT21) and the triac driver. At 4 MHz the CPU executes its control loop in well under 1 ms, leaving most cycles for LCD refresh without flicker. PIC16LC 2.5 V operation also handles the common 24VAC half-wave rectified supply after a small LDO. Pair with the PIC16LC620A for low-cost remote temperature sensors on the same I2C bus.
Recommended
Handheld Digital Multimeter
The PIC16LC923T-04/PT is a good fit for handheld digital multimeters because the on-chip LCD driver directly outputs segment patterns to a 3 1/2 or 4 1/2 digit glass display without external HV inverter or segment driver, while the 35-instruction PIC16 RISC core handles range switching, ADC readout, and continuity buzzer control in real time. The 7 KB OTP code space accommodates calibration tables and unit conversions. Operation down to 2.5 V supports 9V-battery designs with a simple linear regulator, and the 64-TQFP package provides enough GPIO for rotary switch sense, function keys, and the piezo buzzer.
Recommended
Industrial Sensor Readout with On-Glass Display
The PIC16LC923T-04/PT is well suited to industrial panel-mount sensor readouts including pressure transducers, flow meters, and load-cell indicators, because its LCD controller directly drives the typical 4-backplane alphanumeric glass used on field instruments. The 35-instruction RISC core handles linearization math, and I2C/SPI connect to 24-bit sigma-delta ADCs and EEPROM for calibration constants. The 64-TQFP pins expose all GPIO needed for keypad, RS-485 transceiver, and 4-20 mA loop interface. The 'LC' 2.5 V minimum is helpful for loop-powered 2-wire designs drawing <4 mA.
Recommended
Automotive Dashboard Accessory Gauges
The PIC16LC923T-04/PT fits aftermarket automotive accessory gauges such as oil-pressure, boost, and oil-temperature pods because its integrated LCD controller eliminates a separate HV segment-driver and reduces PCB area, while the wide 2.5 V-6 V supply range tolerates automotive cranking transients when paired with a simple TVS-protected regulator. At 4 MHz the core handles RPM averaging and peak-hold logic. Note that the base PIC16LC923T-04/PT is commercial-grade; the automotive equivalent typically requires the 'I' (industrial) or 'Q' (AEC-Q100) grade variant. Use the same silicon in a ruggedized housing for off-road vehicles and marine dashboards.
Recommended
Medical Infusion Pump Front Panel
The PIC16LC923T-04/PT supports medical infusion pump front-panel display modules because its integrated LCD controller handles the typical 4-backplane dot-matrix display for rate, volume, and alarm readouts, while the I2C bus connects to the main controller board. The 35-instruction PIC16 RISC core manages keypad scanning, LED backlight PWM, and alarm patterns at low current draw critical for battery operation. The 7 KB OTP holds rate-limit safety logic. Note that medical devices typically require the industrial temperature grade variant and full IEC 60601 compliance review of the entire system.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC923T-04/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC923-04/PT | PIC16LC923T-04I/PT | PIC16LC923-04I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) | 64-TQFP (10x10) | 64-TQFP (10x10) |
| Core / Family | 8-bit PIC16C RISC | 8-bit PIC16C RISC | 8-bit PIC16C RISC | 8-bit PIC16C RISC |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| RAM | 176 bytes | 176 bytes | 176 bytes | 176 bytes |
| Max CPU Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V |
| Temperature Grade | Commercial | Commercial | Industrial | Industrial |
| Shipping Format | Tape & Reel | Tray | Tape & Reel | Tray |
| Integrated LCD Driver | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated LCD segment driver eliminates external HV driver IC (vs PIC16LC620A-04/SO)
- Low-voltage 2.5 V CMOS operation supports 2-cell battery designs (vs PIC16C923 (standard C-suffix))
- 7 KB OTP program memory vs 1 KB on PIC16LC62x family (vs PIC16LC62A-04I/SO)
Design Notes
The PIC16LC923T-04/PT uses OTP (One-Time-Programmable) EPROM, not flash. Once programmed, the code cannot be electrically erased. Prototypes and low-volume builds should use the windowed PIC16LC923-04 or the flash-based PIC16F-family equivalent (same 64-TQFP footprint per Microchip migration notes) for development. Only move to this OTP part for volume production runs where firmware is finalized, otherwise field recalls cannot update firmware.
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pins, plus a bulk 10 uF tantalum or aluminum polymer capacitor on the same rail. The PIC16LC923 is a low-voltage CMOS part per the datasheet, so power-rail noise and ripple directly affect ADC and LCD contrast accuracy. For battery-powered designs, add a series ferrite bead or pi-filter if the supply is shared with a switching regulator or motor driver.
The 64-TQFP (10x10 mm) package has a 0.5 mm pitch. Per IPC-7351 nominal land patterns, use 0.30 mm wide pads with 0.20 mm solder mask openings, and consider a 4- or 6-mil stencil for reflow. Enable solder paste inspection because TQFP lead coplanarity issues cause open joints at this fine pitch. If hand-rework is anticipated, choose a NiPdAu lead finish (standard on Microchip parts) for better solderability than SnPb finishes.
Route the LCD segment and common (backplane) traces away from noisy digital switching lines and the oscillator traces. Keep COM and SEG traces matched in length where possible to minimize DC offset on the display. Per Microchip's PIC16C92x hardware design notes, the LCD bias generation requires a robust external capacitor network on the VLCD pin; check the datasheet's passive component selection table for the recommended values based on multiplex duty and display size.
Compliance Information
RoHS and REACH compliance status not explicitly stated in the verified web data; left as 'unknown'. The base PIC16LC923T-04/PT is NOT AEC-Q100 qualified; for automotive designs the 'I' (industrial) or 'Q' (AEC-Q100) grade variant should be specified.
