PIC18F2423T-I/SO - 8-bit 40MHz 16KB Flash MCU | Microchip
MPN: PIC18F2423T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.31 | $331.00 |
| 500 | $2.91 | $1,455.00 |
| 1,000 | $2.52 | $2,520.00 |
PIC18F2423T-I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, RAM, and a configurable set of peripherals on one die. PIC microcontrollers use a RISC-style Harvard architecture with separate program and data buses, which lets the fetch and the read/write of an operand happen in the same cycle and yields a deterministic instruction time. The PIC18F family sits at the high-performance end of Microchip's 8-bit portfolio, adding a 16-bit instruction word and 8 x 8 hardware single-cycle multiply to the classic PIC16 core, so it can replace older PIC16 designs without losing peripheral compatibility.
Key features of the PIC18F2423T-I/SO include 10 MIPS throughput, an internal oscillator that runs from 31 kHz to 8 MHz (and up to 32 MHz when paired with the 4x PLL), a Fail-Safe Clock Monitor that allows safe shutdown if the main clock fails, and a dedicated Watchdog Timer with its own on-chip low-power RC oscillator. The 'T' suffix indicates Tape-and-Reel packaging, the 'I' indicates the -40C to +85C industrial temperature range, and the /SO denotes the 28-pin SOIC package.
Architecturally, the device carries the standard PIC18 set: up to 22 digital I/O, a 10-bit ADC with up to 10 channels, two analog comparators, two 8-bit timers plus one 16-bit timer, an Enhanced CCP module, MSSP (SPI/I2C) and EUSART (RS-232/RS-485) serial interfaces, and nanoWatt Technology for low-power sleep modes. These blocks are mapped onto a fixed interrupt vector structure and supported by Microchip's MPLAB X IDE and XC8 compiler toolchain.
Typical applications include consumer appliances, low-end HVAC controls, sensor pre-processing, battery-powered instruments, USB-to-UART bridges, and small graphical/text user interfaces. The wide operating voltage (2.0 V to 5.5 V) and industrial temperature range make the part comfortable in mains-powered and automotive cabin environments.
When designing with this part, always provide bulk decoupling (4.7 uF) plus a 0.1 uF ceramic close to the VDD pins, reserve MCLR with a proper reset circuit, and place a low-ESR bypass on AVDD if the ADC is in use. The internal oscillator is good enough for most UART work up to 115200 baud at 25C; for tight timing, switch to an external crystal. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC18F2423T-I/SO — 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 PIC18F2423T-I/SO (same form factor and footprint) — differing in Package, Timers, Serial Interfaces, ADC, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2423-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2423-E/SO
✅ Drop-In✓ In Stock
$4.42 / Unit
View Datasheet →PIC18F2420T-I/SO
✅ Drop-In✓ In Stock
$3.5 / Unit
View Datasheet →PIC18F2523-I/SO
✅ Drop-In✓ In Stock
$3.12 / Unit
View Datasheet →PIC18F23K22T-I/SO
✅ Drop-In✓ In Stock
$1.34 / Unit
View Datasheet →PIC18F2423T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18, 8-bit RISC Harvard |
| Instruction Set Width | 16-bit |
| Maximum CPU Frequency | 40 MHz (FOSC) |
| Performance | 10 MIPS |
| Program Memory | 16 KB (8K x 16) Flash |
| EEPROM Data Memory | 256 bytes |
| SRAM Data Memory | 768 bytes |
| Hardware Multiply | 8 x 8 single-cycle |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Operating Temperature Range | -40 C to +85 C (Industrial, 'I' grade) |
| Package | 28-pin SOIC (SO), 300 mil |
| Mounting Type | Surface Mount |
| Packaging | Tape and Reel ('T' suffix) |
| I/O Pins | Up to 22 |
| ADC | 10-bit, up to 10 channels |
| Timers | Two 8-bit, one 16-bit |
| Capture/Compare/PWM | 1 x Enhanced CCP |
| Serial Interfaces | MSSP (SPI / I2C), EUSART (RS-232/RS-485) |
| Internal Oscillator | 31 kHz to 8 MHz; up to 32 MHz with 4x PLL |
| Watchdog Timer | Yes, with dedicated on-chip LPRC oscillator |
| Fail-Safe Clock Monitor | Yes |
| MSL Level | 1 |
| RoHS Status | Compliant |
PIC18F2423T-I/SO Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear (reset) input; can be reconfigured as digital input RE3 |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RA7 — Crystal/clock input / PORTA bit 7 |
| Pin 10 | OSC2/CLKO/RA6 — Crystal output / clock output / PORTA bit 6 |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 output |
| Pin 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / EUSART TX / clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / EUSART RX / data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 21 | RB0/AN12/INT0 — PORTB bit 0 / analog input 12 / external interrupt 0 |
| Pin 22 | RB1/AN10/INT1 — PORTB bit 1 / analog input 10 / external interrupt 1 |
| Pin 23 | RB2/AN8 — PORTB bit 2 / analog input 8 |
| Pin 24 | RB3/AN9/CCP2 — PORTB bit 3 / analog input 9 / CCP2 |
| Pin 25 | RB4/AN11 — PORTB bit 4 / analog input 11 |
| Pin 26 | RB5/PGM — PORTB bit 5 / LVP programming |
| Pin 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 28 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC18F2423T-I/SO is suitable for 6 applications: Consumer Appliance Control, HVAC Sensor Pre-Processing, Battery-Powered Instrumentation, USB-to-UART Bridge Dongles, Small Graphic or Text LCD UI, Low-Cost Automotive Cabin Modules.
Consumer Appliance Control
The PIC18F2423T-I/SO fits consumer appliance controllers because its 16 KB enhanced flash and 10 MIPS throughput comfortably run state-machine firmware for washers, dishwashers, and small kitchen appliances. With 22 digital I/O, two analog comparators, and a 10-bit ADC with up to 10 channels, it can read keypads, sensor bridges, and triac-fired loads without external glue logic. The 2.0-5.5 V VDD range simplifies sharing a 3.3 V or 5 V rail with the HMI logic, and the internal 31 kHz to 32 MHz oscillator eliminates external crystals in cost-sensitive SKUs.
Recommended
HVAC Sensor Pre-Processing
In HVAC sensor nodes the PIC18F2423T-I/SO can sample temperature/humidity transducers with its 10-bit ADC, run linearization in firmware, and stream results over EUSART or MSSP I2C to a master controller. The Fail-Safe Clock Monitor guards against crystal failure in unattended installations, switching to the internal RC oscillator to keep the communication stack alive. nanoWatt Technology idle and sleep modes drop the device below 1 uA typical, which is essential for battery-backed thermostats and wireless air-quality senders.
Recommended
Battery-Powered Instrumentation
Portable instruments such as digital multimeters, handheld scanners, and field test sets benefit from the PIC18F2423T-I/SO's 2.0 V low-VDD operation, which lets the MCU run directly from two AA cells until the very end of discharge. nanoWatt Technology with multiple idle and sleep modes keeps average draw low while the Watchdog Timer with a dedicated LPRC oscillator continues to monitor system health. The 16-bit instruction word and 8 x 8 hardware multiply deliver enough DSP-free number-crunching for sensor calibration tables in firmware.
Recommended
USB-to-UART Bridge Dongles
Bridge dongles and protocol converters use the PIC18F2423T-I/SO because its EUSART delivers full-duplex RS-232/RS-485 at up to several hundred kilobaud while the MSSP block handles SPI or I2C slaves on the other side. The 28-pin SOIC footprint is small enough for dongle PCBs, and the wide 2.0-5.5 V VDD range lets the device draw power directly from the host UART lines or a small LDO. Firmware updates via ICSP (PGD/PGC) keep field returns simple.
Recommended
Small Graphic or Text LCD UI
Character LCDs and small graphic OLED panels (for example 128 x 64) are driven easily by the PIC18F2423T-I/SO using the MSSP in SPI mode plus a handful of GPIO for reset, data/command, and chip-select. The 10 MIPS throughput is more than enough to refresh a UI at 30 Hz while leaving CPU headroom for housekeeping tasks. Internal pull-ups on selected I/O and the configurable BOR simplify the schematic, and the industrial temperature range lets the same board serve indoor kiosks and semi-outdoor signs.
Recommended
Low-Cost Automotive Cabin Modules
Interior cabin modules such as HVAC head units, mirror controllers, and seat switch packs frequently use the PIC18F2423T-I/SO thanks to its industrial -40 C to +85 C range and robust PIC18 I/O structure. The PIC18F2423-E/SO variant can be substituted directly on the same PCB where under-dash temperatures occasionally exceed 85 C. EUSART and LIN-friendly software stacks ride on the same UART, while MSSP I2C handles small sensor and EEPROM companions around the device.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F2423T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2423-I/SO | PIC18F2423-E/SO | PIC18F2420T-I/SO | PIC18F2523-I/SO | PIC18F23K22T-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) | 28-SOIC (SO) |
| Program Memory | 16 KB Flash | 16 KB Flash | 16 KB Flash | 16 KB Flash | 32 KB Flash | 8 KB Flash |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| SRAM | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 1536 bytes | 512 bytes |
| Max CPU Frequency | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 64 MHz / 16 MIPS |
| Temperature Grade | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +125 C (E) | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +85 C (I) |
| Packaging Format | Tape & Reel (T) | Tube | Tube | Tape & Reel (T) | Tube | Tape & Reel (T) |
Key Differentiators
- Tape-and-reel packaging ready for high-volume SMT assembly (vs PIC18F2423-I/SO)
- Industrial -40 C to +85 C grade for mainstream embedded designs (vs PIC18F2423-E/SO)
- 16 KB flash with enhanced endurance and ICSP (vs PIC18F23K22T-I/SO)
- Same 28-pin SOIC footprint across PIC18F2x23 family (vs PIC18F2523-I/SO)
Design Notes
Place a 4.7 uF bulk decoupling capacitor close to the VDD pin (pin 20) and a 0.1 uF ceramic bypass right at the same node. If the ADC is used, also decouple AVDD (when present on this package tied to VDD) with a separate 10 uH ferrite + 0.1 uF cap to keep digital switching noise out of the analog rail. Microchip datasheet DC characteristics assume VDD is held within +/- 5% during ADC conversions for rated 10-bit accuracy.
Do not leave MCLR floating. Use a 10 kohm pull-up to VDD plus a 100 nF cap to ground for the standard PIC18 reset circuit; in noisy environments add a TVS or Schottky diode on MCLR to clamp transients. When using Low-Voltage Programming (LVP) via the PGM pin (RB5), tie RB5 low at reset with a pulldown so the part does not accidentally enter programming mode on a noisy power-up.
Route the ICSP pair PGD (RB7) and PGC (RB6) as a short, parallel, length-matched pair to a 6-pin header for production programming and debug. Keep the trace impedance loose (< 50 ohm is fine) and avoid crossing them with switching signals. Reserve a small test pad on the MCLR line so the debugger can drive reset without disturbing the on-board reset components.
When using the internal 31 kHz to 32 MHz oscillator, Microchip datasheet frequency accuracy is typically +/- 2% across voltage and temperature, which is acceptable for asynchronous EUSART up to 9600 baud but marginal above 115200 baud. For high-speed UART or USB applications, switch to an external crystal on OSC1/OSC2 and enable the PLL for accurate baud generation.
Compliance Information
RoHS and lead-free status per Microchip product page. The PIC18F2423T-I/SO is not AEC-Q100 qualified; for AEC-Q100 automotive work use the PIC18F2423T-I/PT or PIC18F2423T-E/SO automotive-grade variants. Halogen-free status not specified in the verified web data.
