PIC16C923-04I/PT - 8-Bit OTP MCU 7KB 4MHz 64-TQFP | Microchip
MPN: PIC16C923-04I/PT β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.85 | $12.85 |
| 10 | $11.55 | $115.50 |
| 100 | $10.1 | $1,010.00 |
| 500 | $9.05 | $4,525.00 |
| 1,000 | $8.2 | $8,200.00 |
PIC16C923-04I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), working memory (RAM), and programmable I/O peripherals. The PIC16C family uses a RISC (Reduced Instruction Set Computer) Harvard architecture with only 35 single-word instructions, where every instruction except branches executes in a single instruction cycle (4 oscillator clocks). This architecture achieves high throughput per MHz and deterministic timing, which is why PIC MCUs have been adopted across industrial control, automotive subsystems, white goods, and battery-powered embedded products since the 1990s.
Key features of the PIC16C923 include the integrated LCD driver that offloads segment/commons timing from the CPU, a wide 3.0 V to 6.0 V operating voltage range suited to 5 V industrial logic rails, programmable code protection, a watchdog timer with on-chip RC oscillator for reliable operation without external components, and an enhanced capture/compare/PWM (ECCP) module. OTP (One-Time-Programmable) EPROM is field-programmable but not erasable, which fits cost-sensitive production runs.
Architecturally, the PIC16C923 uses an 8-bit ALU with a 14-bit instruction word, providing 4 KB of program address space (8K x 14 bits of EPROM). The peripheral set targets embedded human-machine-interface designs where a microcontroller, A/D front end, and LCD bias generation are co-located on a single die.
Typical applications include industrial control panels with integrated LCD readouts, consumer appliances with segmented displays, instrumentation front ends with A/D conversion, and security/alarm keypads. The integrated LCD driver removes the need for an external segment-driver IC, reducing both BOM cost and PCB area.
When designing with this device, engineers must plan code into the OTP window carefully because OTP memory cannot be re-programmed, and the 64-pin TQFP footprint requires careful PCB layout to maintain signal integrity on the LCD segment traces. A reliable programmer and verified in-circuit emulator are recommended for development.
This page synthesizes verified distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet summary, giving procurement and design engineers a single reference for evaluation.
Drop-in alternatives for PIC16C923-04I/PT 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:
PIC16C923-04/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C923-08/PT
β Drop-Inβ In Stock
$7.2 / Unit
View Datasheet βPIC16C925-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C923T-04I/PT
β Drop-Inβ In Stock
$8.05 / Unit
View Datasheet βPIC16F946-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C924-04I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C923-04I/PT Maximum Ratings & Electrical Characteristics
| Core | PIC16 (8-bit RISC) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 176 B |
| EEPROM Size | None (OTP only) |
| Maximum CPU Speed | 4 MHz |
| Instruction Cycle | 200 ns (500 ns for branches) |
| Number of I/O Pins | 25 |
| Number of Instructions | 35 (single-word) |
| Package | 64-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount (Gull Wing) |
| Operating Voltage | 3.0 V to 6.0 V |
| Operating Temperature | -40C to +85C (Industrial, "I") |
| LCD Driver | 32 segments x 4 commons integrated |
| A/D Converter | 8-bit, up to 5 channels |
| Serial Interfaces | SSP (SPI/I2C) + USART (SCI) |
| Timers | 3 x Timer/Counter (TMR0, TMR1, TMR2) |
| CCP Module | ECCP (Enhanced Capture/Compare/PWM) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| RoHS Status | Compliant |
PIC16C923-04I/PT 64-pin tqfp (10x10 mm) Pin Configuration Guide
Pin configuration for PIC16C923-04I/PT (64-pin 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 PIC16C923-04I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16C923-04I/PT is suitable for 7 applications: Industrial Control Panel with LCD Readout, Consumer Appliance with Segmented Display, Security Alarm Keypad, Portable Instrumentation Front End, HVAC Thermostat Controller, Automotive Aftermarket Accessory Display, Medical Device Front Panel (Non-Implantable).
Industrial Control Panel with LCD Readout
The PIC16C923-04I/PT's integrated 32-segment x 4-common LCD driver directly drives custom glass or character LCDs without an external segment-driver IC, which is ideal for industrial control panels that must display process variables on the front panel. The 8-bit A/D converter with up to 5 channels digitizes analog sensor signals such as 4-20 mA loops, thermocouple amplifiers, or potentiometer setpoints on the same chip. With 4 MHz CPU speed and 200 ns instruction cycle, the part comfortably handles keypad scanning, debounce, and LCD refresh loops at low power. The industrial -40C to +85C temperature grade suits factory-floor enclosures and unheated cabinets.
Recommended
Consumer Appliance with Segmented Display
White goods such as washing machines, microwave ovens, and dishwashers require a microcontroller that can drive a segmented front-panel display, scan a keypad matrix, and control relays or triacs - exactly what PIC16C923-04I/PT provides on a single chip. The integrated LCD driver eliminates the cost of an external HT1621 or similar segment driver, while the ECCP module generates PWM outputs for motor speed control or triac-fired heater regulation. With 7 KB of OTP program memory, enough room exists for state-machine control logic, timing profiles, and safety diagnostics in mid-complexity appliances. The wide 3.0-6.0 V operating range tolerates unregulated rectified mains rails.
Recommended
Security Alarm Keypad
A security alarm keypad benefits from PIC16C923-04I/PT's integrated LCD driver to show arm/disarm status, zone fault codes, and entry-delay countdowns on a small custom glass display. The PIC16C core runs the keypad scanning matrix, debounce, and event sequencing at 4 MHz while leaving CPU bandwidth free for the EEPROM-backed event log interface over the USART. The watchdog timer with on-chip RC oscillator provides autonomous recovery from EMI-induced lockups - essential for a product that may be installed in electrically noisy environments near mains wiring. OTP memory prevents field firmware tampering.
Recommended
Portable Instrumentation Front End
Handheld instrumentation such as digital multimeters, environmental meters, and portable gas detectors needs an MCU with a low-power LCD bias generator, an A/D converter for sensor inputs, and enough I/O for switches and a buzzer - a profile that matches PIC16C923-04I/PT exactly. The integrated LCD driver saves power by maintaining a multiplexed display without constant CPU refresh, while the wide 3.0-6.0 V supply range lets designers run directly from a 3-cell AA battery pack or a buck/boost regulator. The 176-byte SRAM is adequate for measurement averaging buffers and menu state.
Recommended
HVAC Thermostat Controller
Thermostat designs benefit from PIC16C923-04I/PT's 32-segment x 4-common LCD for displaying setpoint, ambient temperature, fan speed, and time-of-day on a single custom display. The ECCP module produces PWM outputs to drive TRIACs or relay coils for the compressor contactor, indoor blower, and reversing valve. The integrated 8-bit A/D digitizes thermistor dividers for ambient and supply-line temperature sensing, while the USART links to a Wi-Fi or sub-GHz module for cloud-connected smart-thermostat variants. Industrial temperature grade supports attic and basement installations.
Recommended
Automotive Aftermarket Accessory Display
Aftermarket automotive accessories such as boost gauges, tire-pressure monitors, and tachometer add-ons use PIC16C923-04I/PT for its integrated LCD driver and A/D converter in a compact TQFP-64 footprint. The 8-bit A/D accepts 0-5 V sensor inputs for analog gauges, while the SPI/I2C synchronous serial port connects to external sensors or wireless receiver modules. The 4 MHz CPU speed is adequate for refresh rates of custom segmented displays, and the industrial temperature grade tolerates under-dash environments. Note: for OEM automotive applications, an AEC-Q100-qualified part should be selected instead.
Recommended
Medical Device Front Panel (Non-Implantable)
Non-implantable medical devices such as bedside monitors, infusion pump keypads, and physiotherapy equipment use PIC16C923-04I/PT to drive front-panel segmented LCDs and read user input from membrane keypads. The integrated LCD driver and A/D converter reduce external component count for compact BOMs. The ECCP module generates PWM-driven buzzer tones for alarm signalling, while the USART communicates with the main processor board. Designers must verify regulatory compliance (IEC 60601, etc.) for the complete medical system; the MCU itself is not medical-grade certified.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C923-04I/PT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C923-04/PT | PIC16C923-08/PT | PIC16C925-I/PT | PIC16C923T-04I/PT | PIC16F946-I/PT | PIC16C924-04I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Program Memory Type | OTP EPROM 7 KB | OTP EPROM 7 KB - same | OTP EPROM 7 KB - same | OTP EPROM 7 KB - same | OTP EPROM 7 KB - same | Flash 14 KB (reprogrammable) | OTP EPROM 7 KB - same |
| Max CPU Speed | 4 MHz | 4 MHz - same | 8 MHz (+100%) | 20 MHz (+400%) | 4 MHz - same | 20 MHz (+400%) | 4 MHz - same |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Commercial 0C to +70C | Industrial -40C to +85C - same | Industrial -40C to +85C - same | Industrial -40C to +85C - same | Industrial -40C to +85C - same |
| LCD Driver | 32 seg x 4 com | 32 seg x 4 com - same | 32 seg x 4 com - same | 32 seg x 4 com - same | 32 seg x 4 com - same | 32 seg x 4 com - same | 32 seg x 4 com - same |
| Number of I/O Pins | 25 | 25 - same | 25 - same | 25 - same | 25 - same | 53 (Flash variant expands I/O) | 25 - same |
| Lifecycle Status (2026-09-19) | NRND | NRND | NRND | NRND | NRND | Active (recommended for new designs) | NRND |
| A/D Converter | 8-bit, 5 channels | 8-bit, 5 channels - same | 8-bit, 5 channels - same | 8-bit, 5 channels - same | 8-bit, 5 channels - same | 8-bit, 8 channels | 8-bit, 5 channels - same |
Key Differentiators
- Integrated 32-segment x 4-common LCD driver on-chip (vs Generic PIC16F877A-I/P (no LCD driver, requires external HT1621))
- Mid-range PIC16 architecture with 35 single-word instructions (vs PIC18 family parts (16-bit instruction word, 75 instructions))
- Wide 3.0 V to 6.0 V supply tolerance (vs PIC16F946-I/PT (2.0 V to 5.5 V flash successor))
Design Notes
OTP EPROM cannot be re-programmed. The PIC16C923-04I/PT uses One-Time-Programmable memory, so any code change after programming requires a new IC. For development cycles and field-updateable products, migrate to PIC16F946-I/PT (same TQFP-64 footprint, flash memory, Active lifecycle). Plan firmware revisions carefully before committing to OTP tooling.
The integrated LCD driver routes segment signals through PORTA/PORTB/PORTC pads and through dedicated SEG0-SEG31 pins; route these as short, parallel traces with consistent spacing to minimize crosstalk. Place the VLCD1/VLCD2/VLCD3 bypass capacitors (typically 0.1 uF ceramic) within 3 mm of their respective pins, and tie unused SEG and COM pins to VSS if the LCD is not populated, per datasheet guidance.
Estimated supply current: at 4 MHz CPU and 5 V VDD, PIC16C923-04I/PT draws typically 2-5 mA active and under 10 uA in sleep, per Microchip datasheet. Add a 10 uF bulk + 0.1 uF decoupling cap pair within 5 mm of the VDD/VSS pins. If the A/D converter is used, isolate AVDD/AVSS from VDD/VSS with a ferrite bead or filter and add a dedicated 0.1 uF + 10 uF pair at AVDD.
The 64-pin TQFP (10x10 mm body, 0.5 mm pitch) requires careful PCB layout: use 0.20-0.25 mm trace width between pads and via-in-pad or tented vias for fan-out. Land pattern per IPC-7351 (TQFP-64 pitch 0.5 mm). Keep the exposed thermal pad soldered to a moderate copper pour to reduce ground bounce on the digital ports, even though the part does not formally require a thermal pad.
Compliance Information
RoHS-compliant per Microchip product page; AEC-Q100 not qualified (not recommended for OEM automotive). For automotive applications, use AEC-Q100-qualified PIC16F equivalents.
