PIC16C923T-08I/PT - 8-Bit OTP MCU w/ LCD Driver, 8MHz, TQFP-64 | Microchip
MPN: PIC16C923T-08I/PT โ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $10.5 | $10,500.00 |
PIC16C923T-08I/PT Overview
An 8-bit OTP (One-Time-Programmable) microcontroller is a non-volatile MCU whose program memory is implemented as EPROM and can be written only once after erasure by UV light. It belongs to the broader class of microcontrollers -> embedded processors -> digital ICs. The PIC16C923 specifically targets applications requiring integrated LCD glass driving, eliminating the need for an external LCD controller and reducing both BOM cost and PCB area.
Key features of the PIC16C923T-08I/PT include a powerful RISC CPU with only 35 single-word instructions to learn, 500 ns instruction execution time, all single-cycle instructions except for program branches, and 8-level hardware stack. The on-chip LCD driver supports multiplexed LCD panels up to 4 common lines, while the integrated peripherals include a 5-channel 8-bit A/D converter, USART, SSP, and capture/compare/PWM modules.
The PIC16C923T-08I/PT leverages CMOS EPROM process technology, giving it low power consumption characteristic of CMOS logic combined with field-programmable (one-shot) non-volatile memory. The architecture is optimized for applications where the program code is finalized during prototyping and small-to-medium production runs - the EPROM cannot be electrically erased but is reliable in the field once programmed and windowless-packaged.
Typical applications include consumer appliances (washing machines, microwave ovens, climate control panels), industrial HMI panels, instrumentation with LCD readouts, point-of-sale terminals, and any battery-powered or line-powered product requiring integrated alphanumeric or segmented LCD glass driving. The combination of LCD driver, ADC, and USART in a single chip reduces external component count.
When designing with this device, note that the OTP memory cannot be re-programmed - prototypes should use the JW windowed ceramic variant for development and the PT plastic TQFP for production. Adequate decoupling (100 nF ceramic plus 10 uF bulk) near VDD/AVDD/VSS pins is required for ADC accuracy, and the LCD bias generation must use the recommended external resistor ladder per the datasheet.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, enabling faster BOM decisions.
Drop-in alternatives for PIC16C923T-08I/PT โ same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16C923T-08I/PT (same form factor and footprint) โ differing in Instruction Cycle Time, LCD Driver, Operating Temperature, Number of I/O Pins, Program Memory Size.
Quick Comparison Tool โ Select alternative parts for side-by-side comparison:
PIC16F946-I/PT
โ Drop-In๐ Reference alternative (not in catalog)
PIC16F917-I/PT
โ Drop-In๐ Reference alternative (not in catalog)
PIC16F914-I/PT
โ Drop-In๐ Reference alternative (not in catalog)
PIC16C923T-08I/L
โ Drop-Inโ In Stock
$5.4 / Unit
View Datasheet โPIC16C923-08I/PT
โ Drop-In โ ๏ธ ๅๆฐๅพ ้ช่ฏ๐ Reference alternative (not in catalog)
PIC16C923T-08I/PT Maximum Ratings & Electrical Characteristics
| Series | PICยฎ 16C |
| Family | PIC16C923 |
| Core Processor | PIC |
| Core Size | 8-bit |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| EEPROM Size | None (OTP only) |
| Maximum Clock Frequency | 8 MHz |
| Instruction Cycle Time | 500 ns (200 ns at 20 MHz - N/A here, 8 MHz only) |
| Number of I/O Pins | 53 (approx.) |
| Supply Voltage (VDD) | 4.0 V to 6.0 V (5V typical) |
| A/D Converter | 8-bit, 5 channels |
| LCD Driver | Yes, integrated |
| USART | Yes |
| SSP (SPI/I2C) | Yes |
| PWM / CCP | Yes |
| Number of Instructions | 35 (single-word) |
| Operating Temperature | -40C to +85C (Industrial - 'I' suffix) |
| Package | 64-pin TQFP (PT) |
| Mounting Type | Surface Mount |
PIC16C923T-08I/PT Pin Configuration
| Pin 1 | SEG31/RF7 โ LCD segment 31 or GPIO RF7 |
| Pin 2 | SEG30/RF6 โ LCD segment 30 or GPIO RF6 |
| Pin 3 | SEG29/RF5 โ LCD segment 29 or GPIO RF5 |
| Pin 4 | SEG28/RF4 โ LCD segment 28 or GPIO RF4 |
| Pin 5 | SEG27/RF3 โ LCD segment 27 or GPIO RF3 |
| Pin 6 | SEG26/RF2 โ LCD segment 26 or GPIO RF2 |
| Pin 7 | SEG25/RF1 โ LCD segment 25 or GPIO RF1 |
| Pin 8 | SEG24/RF0 โ LCD segment 24 or GPIO RF0 |
| Pin 9 | AVDD โ Analog power supply |
| Pin 10 | AVSS โ Analog ground |
| Pin 11 | SEG23/RE2 โ LCD segment 23 or GPIO RE2 |
| Pin 12 | SEG22/RE1 โ LCD segment 22 or GPIO RE1 |
| Pin 13 | SEG21/RE0 โ LCD segment 21 or GPIO RE0 |
| Pin 14 | OSC1/CLKI โ Crystal oscillator input / external clock |
| Pin 15 | OSC2/CLKO โ Crystal oscillator output |
| Pin 16 | VLCD1 โ LCD voltage 1 (bias generation) |
| Pin 17 | VLCD2 โ LCD voltage 2 (bias generation) |
| Pin 18 | VLCD3 โ LCD voltage 3 (bias generation) |
| Pin 19 | COM3/RD7 โ LCD common 3 or GPIO RD7 |
| Pin 20 | COM2/RD6 โ LCD common 2 or GPIO RD6 |
| Pin 21 | COM1/RD5 โ LCD common 1 or GPIO RD5 |
| Pin 22 | COM0/RD4 โ LCD common 0 or GPIO RD4 |
| Pin 23 | SEG20/RD3 โ LCD segment 20 or GPIO RD3 |
| Pin 24 | SEG19/RD2 โ LCD segment 19 or GPIO RD2 |
| Pin 25 | SEG18/RD1 โ LCD segment 18 or GPIO RD1 |
| Pin 26 | SEG17/RD0 โ LCD segment 17 or GPIO RD0 |
| Pin 27 | RC7/RX/DT โ GPIO RC7 / USART RX / I2C data |
| Pin 28 | RC6/TX/CK โ GPIO RC6 / USART TX / I2C clock |
| Pin 29 | RC5/SDO โ GPIO RC5 / SPI data out |
| Pin 30 | RC4/SDI/SDA โ GPIO RC4 / SPI data in / I2C data |
| Pin 31 | RC3/SCK/SCL โ GPIO RC3 / SPI clock / I2C clock |
| Pin 32 | RC2/CCP1 โ GPIO RC2 / CCP1 PWM output |
| Pin 33 | RC1/T1OSI/CCP2 โ GPIO RC1 / Timer1 oscillator in / CCP2 |
| Pin 34 | RC0/T1OSO โ GPIO RC0 / Timer1 oscillator out |
| Pin 35 | RB7 โ GPIO RB7 |
| Pin 36 | RB6 โ GPIO RB6 |
| Pin 37 | RB5 โ GPIO RB5 |
| Pin 38 | RB4 โ GPIO RB4 |
| Pin 39 | RB3/CCP1 โ GPIO RB3 / CCP1 alternate |
| Pin 40 | RB2 โ GPIO RB2 |
| Pin 41 | RB1 โ GPIO RB1 |
| Pin 42 | RB0/INT โ GPIO RB0 / external interrupt |
| Pin 43 | VDD โ Digital power supply (+5V) |
| Pin 44 | VSS โ Digital ground |
| Pin 45 | RA0/AN0 โ GPIO RA0 / ADC input 0 |
| Pin 46 | RA1/AN1 โ GPIO RA1 / ADC input 1 |
| Pin 47 | RA2/AN2 โ GPIO RA2 / ADC input 2 |
| Pin 48 | RA3/AN3/VREF+ โ GPIO RA3 / ADC input 3 / VREF+ |
| Pin 49 | RA4/T0CKI โ GPIO RA4 / Timer0 clock input |
| Pin 50 | RA5/AN4/SS โ GPIO RA5 / ADC input 4 / SPI slave select |
| Pin 51 | SEG16/RG4 โ LCD segment 16 or GPIO RG4 |
| Pin 52 | SEG15/RG3 โ LCD segment 15 or GPIO RG3 |
| Pin 53 | SEG14/RG2 โ LCD segment 14 or GPIO RG2 |
| Pin 54 | SEG13/RG1 โ LCD segment 13 or GPIO RG1 |
| Pin 55 | SEG12/RG0 โ LCD segment 12 or GPIO RG0 |
| Pin 56 | SEG11 โ LCD segment 11 |
| Pin 57 | SEG10 โ LCD segment 10 |
| Pin 58 | SEG9 โ LCD segment 9 |
| Pin 59 | SEG8 โ LCD segment 8 |
| Pin 60 | SEG7 โ LCD segment 7 |
| Pin 61 | SEG6 โ LCD segment 6 |
| Pin 62 | SEG5 โ LCD segment 5 |
| Pin 63 | SEG4 โ LCD segment 4 |
| Pin 64 | MCLR/VPP โ Master clear reset / programming voltage |
Typical Applications
PIC16C923T-08I/PT is suitable for 6 applications: Consumer Appliance Control with LCD, Industrial HMI / Instrumentation Panels, Point-of-Sale (POS) Terminals, Medical Device Front Panels (Non-Critical), Remote Sensor / Metering Endpoints, Educational / Hobby Development (with Windowed Variant).
Consumer Appliance Control with LCD
The PIC16C923T-08I/PT is ideal for consumer appliance front panels such as washing machines, microwave ovens, dishwashers, and HVAC thermostats. Its integrated LCD driver supports up to 4 multiplexed commons and many segment lines, eliminating the need for an external LCD controller IC. The 7 KB OTP EPROM holds appliance state-machine firmware comfortably, while the 8-bit ADC reads thermistor or sensor inputs. The 8 MHz clock provides 500 ns instruction execution, fast enough for real-time UI updates and user-input debouncing. Place the IC near the LCD glass with short trace lengths on SEG/COM lines, and add the recommended external resistor ladder for LCD bias generation per the datasheet.
Recommended
Industrial HMI / Instrumentation Panels
The PIC16C923T-08I/PT suits industrial human-machine interface panels and instrumentation readouts that need alphanumeric or segmented LCD displays. Its integrated USART enables RS-232/RS-485 communication with a host PLC or supervisory controller, while the 8-bit ADC monitors analog process variables. The industrial temperature grade (-40C to +85C, 'I' suffix) is rated for factory floor environments. The integrated LCD driver reduces BOM cost by replacing an external LCD controller, and the 64-pin TQFP provides ample I/O for keypad scanning, LED indicators, and buzzer drive. Use optocouplers on the USART lines for galvanic isolation in noisy industrial environments.
Recommended
Point-of-Sale (POS) Terminals
POS terminals benefit from the PIC16C923T-08I/PT integrated LCD driver, which directly drives the customer-facing display without an external controller. The integrated USART interfaces with external peripherals such as barcode scanners, receipt printers, or magnetic-stripe readers. The 7 KB program memory holds basic transaction firmware, and the 8 MHz clock provides responsive user interaction. The 5V supply simplifies interface with traditional 5V LCD glass and peripheral logic. For battery-backed designs, the PIC16F946-I/PT flash variant offers easier firmware updates in the field.
Recommended
Medical Device Front Panels (Non-Critical)
Non-critical medical device front panels such as blood-pressure monitors, glucose meters, and portable diagnostic readouts can use the PIC16C923T-08I/PT for its integrated LCD driver, low power consumption, and 5V operation that simplifies interface with traditional LCD glass. The integrated 8-bit ADC reads sensor inputs directly. Note that critical-care or life-support equipment requires AEC-Q100 or medical-grade certification that EPROM-based PIC16C parts may not carry - check with Microchip for the latest compliance documentation before design-in. For new medical designs, migrate to PIC16F946-I/PT or PIC24/dsPIC families for flash reprogrammability and modern certification.
Recommended
Remote Sensor / Metering Endpoints
Remote sensor endpoints and metering applications (water meters, gas meters, simple environmental sensors) leverage the PIC16C923T-08I/PT low-power CMOS design and integrated LCD readout for displaying measurements locally. The 8-bit ADC reads sensor signals, while the integrated USART or SSP interfaces with external communication modules. The OTP memory is acceptable for fixed-function metering firmware that does not require field updates. For new metering designs, the flash-based PIC16F946-I/PT offers in-field firmware updates for protocol changes or calibration adjustments.
Recommended
Educational / Hobby Development (with Windowed Variant)
The PIC16C923T-08I/PT family is suitable for educational and hobby development when paired with the PIC16C923 JW (windowed) variant for prototyping. The JW ceramic package has a quartz window that allows UV erasure of the EPROM, enabling repeated programming cycles during learning or firmware iteration. Once firmware is finalized, the production build uses the plastic PT (TQFP-64) package for cost-effective field deployment. The 35-instruction RISC architecture is approachable for beginners, and the integrated LCD driver produces satisfying visual feedback on segment displays during experimentation.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C923T-08I/PT โ comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F946-I/PT | PIC16F917-I/PT | PIC16F914-I/PT | PIC16C923-08I/PT |
|---|---|---|---|---|---|
| Package | TQFP-64 (PT) | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP EPROM (7 KB) | Flash (14 KB) | Flash (14 KB) | Flash (8 KB) | OTP EPROM (7 KB) |
| Maximum Clock Frequency | 8 MHz | 20 MHz | 20 MHz | 20 MHz | 8 MHz |
| Reprogrammable In-Circuit | No (OTP only) | Yes (Flash) | Yes (Flash) | Yes (Flash) | No (OTP only) |
| Integrated LCD Driver | Yes | Yes | Yes | Yes | Yes |
| A/D Converter | 8-bit, 5 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 5 channels | 8-bit, 5 channels |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Lifecycle Status | Obsolete | Active | Active | Active | Obsolete |
Key Differentiators
- Integrated LCD driver eliminates external controller (vs PIC16C773-I/SS (28-pin, no LCD driver))
- Large I/O count with 64-pin TQFP (vs PIC16C770-I/SS (20-pin))
- Flash replacement extends lifecycle (vs PIC16F946-I/PT (active replacement))
Design Notes
The PIC16C923T-08I/PT uses OTP EPROM memory that cannot be electrically erased. Prototyping with this part in plastic TQFP is wasteful - any firmware bug requires scrapping the device. Use the PIC16C923/JW (windowed ceramic) variant for development, then move to the PT plastic TQFP for production once firmware is finalized. Alternatively, prototype with the flash-based PIC16F946-I/PT (same footprint) and reserve the PIC16C923 for production after firmware lock.
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/VSS pin pair, plus a single 10 uF bulk tantalum or ceramic capacitor on the main VDD rail. For ADC accuracy, add a separate 100 nF on AVDD/AVSS and route AVSS back to a clean ground via. AVDD and VDD can be tied together if ADC accuracy is not critical, but separate filtering improves noise performance. The integrated LCD driver adds dynamic current spikes during segment updates - the bulk capacitor must supply these transients without significant droop.
Route the LCD SEG and COM traces as short and direct as possible to minimize capacitive loading on the LCD driver pins. Long traces (>50 mm) cause ghosting and contrast loss on multiplexed LCDs. Keep LCD traces away from switching power supply nodes and high-speed digital signals to avoid coupled noise. The VLCD1/VLCD2/VLCD3 bias generation pins require external resistor ladders per the datasheet - typically three resistors per bias pin - placed close to the IC and bypassing the bias node with a 1 uF to 10 uF capacitor.
The USART and SSP pins (RC4-RC7) share functions with the LCD driver and GPIO - reconfigure these carefully when enabling peripherals. The 5V supply is incompatible with 3.3V peripherals without level shifters. The MCLR reset pin requires a 10 kohm pull-up to VDD; do not leave it floating. The OSC1/OSC2 crystal traces must be short (under 10 mm) with the crystal load capacitors (typically 15-33 pF) placed adjacent to the IC pins.
Compliance Information
PIC16C923T-08I/PT is an obsolete EPROM-based MCU. Specific RoHS/REACH compliance should be verified with Microchip. AEC-Q100 automotive qualification is not applicable to this industrial-grade EPROM part. Conflict minerals compliance per Microchip's standard declaration.
