PIC18F24K20T-I/SS - 64MHz 8-bit 16KB Flash MCU | Microchip
MPN: PIC18F24K20T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.05 | $4.05 |
| 10 | $3.65 | $36.50 |
| 100 | $3.1 | $310.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.24 | $2,240.00 |
| 3,000 | $1.92 | $5,760.00 |
PIC18F24K20T-I/SS Overview
An 8-bit PIC18 microcontroller is a Harvard-architecture CMOS RISC device that combines a compact instruction set with rich peripheral integration for low-power embedded control. The PIC18F2XK20/4XK20 family adds nanoWatt XLP technology - a suite of sleep, idle, and clock-gating modes that allow active currents in the microamp range and sleep currents well below 1 uA, ideal for battery-powered or energy-harvesting products that must run for years on a single cell.
Key features include 25 digital I/O pins, a 10-bit ADC with up to 11 channels, multiple Enhanced USART, MSSP (SPI/I2C) ports, two analog comparators, a hardware ECCP plus two CCP modules, and two 8-bit timers paired with three 16-bit timers. Internal oscillator options from 8 MHz to 31 kHz plus PLL multiplication remove the need for an external crystal in cost-sensitive designs while preserving accurate USB-friendly timing through HF-INTOSC with 4x PLL.
Typical applications include battery-powered sensor nodes, IoT edge devices, low-energy wireless protocol stacks, portable consumer electronics, motor and fan control loops, and automotive interior subsystems. The combination of XLP, 64 MHz core, and dual capture/compare timers lets firmware implement PID control or PWM dimming without an external DSP.
When designing with this device, plan I/O bank grouping around the analog and digital supply pins (AVDD/AVSS/VDD/VSS) and reserve the PGM/LVP pin (RB5/PGM) so ICSP programming is not blocked. Choose the SSOP variant (PIC18F24K20T-I/SS) when board height is constrained; otherwise the 28-pin SOIC option (PIC18F24K20T-I/SO) is preferred for hand-soldering or through-hole rework, and the same die is available in QFN (ML) for tighter layouts.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F24K20T-I/SS — 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 PIC18F24K20T-I/SS (same form factor and footprint) — differing in Package, Timers, ADC, Operating Temperature, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24K20-I/SS
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC18F24K20-E/SS
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →PIC18F24K20T-I/SO
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC18F23K20T-I/SS
✅ Drop-In✓ In Stock
$2.22 / Unit
View Datasheet →PIC18F24K20T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 (8-bit RISC) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 768 B |
| Data EEPROM | 256 B |
| Maximum CPU Frequency | 64 MHz (16 MIPS) |
| Supply Voltage | 1.8 V to 3.6 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 11 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Capture/Compare/PWM | 1 x ECCP + 2 x CCP |
| Communication | EUSART, MSSP (SPI / I2C) |
| Comparators | 2 |
| Operating Temperature | -40 C to +85 C (Industrial, "I") |
| Package | 28-pin SSOP (0.209", 5.30 mm) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Low-Power Technology | nanoWatt XLP |
PIC18F24K20T-I/SS Pin Configuration
| Pin 1 | RA2/AN2 — Digital I/O / Analog input channel 2 |
| Pin 2 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC positive reference |
| Pin 3 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 4 | RA5/AN4/SS/HLVDIN — Digital I/O / Analog input 4 / SPI slave select / High/Low-Voltage detect input |
| Pin 5 | VDD — Positive supply (1.8-3.6 V) |
| Pin 6 | VSS — Ground reference |
| Pin 7 | OSC1 — Crystal oscillator input / external clock input |
| Pin 8 | OSC2 — Crystal oscillator output / clock output |
| Pin 9 | RC0/T1OSO — Digital I/O / Timer1 oscillator output |
| Pin 10 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Pin 11 | RC2/ECCP1/P1A — Digital I/O / ECCP1 output / PWM 1A |
| Pin 12 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Pin 13 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Pin 14 | RC5/SDO — Digital I/O / SPI data out |
| Pin 15 | RC6/TX/CK — Digital I/O / EUSART TX / clock |
| Pin 16 | RC7/RX/DT — Digital I/O / EUSART RX / data |
| Pin 17 | RB7/PGD — Digital I/O / ICSP data |
| Pin 18 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 19 | RB5/PGM — Digital I/O / LVP programming input |
| Pin 20 | RB4/AN11 — Digital I/O / Analog input 11 |
| Pin 21 | RB3/AN9/CCP2 — Digital I/O / Analog input 9 / CCP2 I/O |
| Pin 22 | RB2/AN8/INT2 — Digital I/O / Analog input 8 / external interrupt 2 |
| Pin 23 | RB1/AN10/INT1 — Digital I/O / Analog input 10 / external interrupt 1 |
| Pin 24 | RB0/AN12/INT0 — Digital I/O / Analog input 12 / external interrupt 0 |
| Pin 25 | AVDD — Analog positive supply (tie to VDD) |
| Pin 26 | AVSS — Analog ground (tie to VSS) |
| Pin 27 | RA1/AN1 — Digital I/O / Analog input 1 |
| Pin 28 | RA0/AN0 — Digital I/O / Analog input 0 |
Typical Applications
PIC18F24K20T-I/SS is suitable for 6 applications: Battery-Powered Sensor Node, Industrial Control and Automation, Home Appliance and Consumer White Goods, Portable Medical and Wellness Devices, Automotive Interior and Body Modules, IoT Edge Device with Wireless Co-Processor.
Battery-Powered Sensor Node
The PIC18F24K20T-I/SS fits battery-powered sensor nodes because its nanoWatt XLP technology pushes sleep current below 1 uA while active current stays around 1 mA at 1 MHz, enabling multi-year coin-cell operation. The 10-bit ADC with up to 11 channels handles temperature, humidity, and analog front-ends directly without an external amplifier. 16 KB Flash and 768 B RAM comfortably fit typical LoRaWAN/BLE-SoC SPI host drivers plus sensor-fusion math. The 1.8-3.6 V wide supply range allows direct Li-coin or 2xAA operation with no LDO.
Recommended
Industrial Control and Automation
For industrial control loops, the PIC18F24K20T-I/SS offers 16 MIPS of compute headroom at 64 MHz, plus 1 ECCP + 2 CCP modules for triac/PWM phase-angle or DC motor drive up to tens of kHz. The EUSART and MSSP blocks talk to RS-485 transceivers and I2C sensors concurrently, while the two comparators handle zero-cross detection or overcurrent protection without external analog ICs. Industrial -40C to +85C operation and a 28-pin SSOP profile integrate easily into DIN-rail controllers.
Recommended
Home Appliance and Consumer White Goods
In consumer appliances, the PIC18F24K20T-I/SS drives LED indicators, button matrices, and buzzer/PWM channels via its 25 I/O. 16 KB Flash accommodates connectivity stacks (UART-to-BLE, sub-GHz radio host) plus UI logic. The internal 8-31 MHz HF-INTOSC with 4x PLL removes the external crystal cost, while the wide 1.8-3.6 V supply supports both 2xAA and 3.3 V regulated rails. nanoWatt XLP modes meet standby ERP regulations in vacuum cleaners, coffee machines, and small kitchen devices.
Recommended
Portable Medical and Wellness Devices
Wellness devices such as thermometers, pulse oximeters, and pill dispensers benefit from the PIC18F24K20T-I/SS's 1.8-3.6 V operation, 64 MHz MIPS performance, and rich analog peripherals that interface directly to sensor bridges. The 10-bit ADC is sufficient for thermistor / pulse-front-end digitization with an external op-amp, and 768 B of RAM is enough for FIR-filtered SpO2 or heart-rate sampling buffers. nanoWatt XLP keeps battery shelf life on the order of years between uses.
Recommended
Automotive Interior and Body Modules
Inside the cabin, the PIC18F24K20T-I/SS controls LED lighting, HVAC blower feedback, seat-position sensing, and mirror/wiper logic. PWM-driven LEDs via the ECCP/CCP pair provide smooth dimming with no audible flicker, while EUSART links to body-domain LIN transceivers. Industrial-grade parts suit non-safety interior nodes; designers needing AEC-Q100 should look at the PIC18F24K20-E/SS extended temperature grade instead. The 28-pin SSOP footprint fits compact PCBAs hidden behind trim.
Recommended
IoT Edge Device with Wireless Co-Processor
The PIC18F24K20T-I/SS makes a strong host MCU for an external Wi-Fi or sub-GHz co-processor. MSSP (SPI/I2C) plus EUSART enable dual-radio connectivity, while 25 I/O handle user interfaces and discrete sensors. 16 KB Flash can host TLS lite, AT-command parsers, and OTA state machines, and 768 B of RAM is enough to buffer command responses. nanoWatt XLP sleep modes let the system idle at single-digit uA between radio events, which is critical for battery-backed IoT edge nodes.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24K20T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24K20-I/SS | PIC18F24K20-E/SS | PIC18F23K20T-I/SS | PIC18F24K20T-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-28 | SSOP-28 | SSOP-28 | SSOP-28 | SOIC-28 |
| Flash / RAM / EEPROM | 16 KB / 768 B / 256 B | 16 KB / 768 B / 256 B | 16 KB / 768 B / 256 B | 8 KB / 768 B / 256 B | 16 KB / 768 B / 256 B |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +85 C | -40 C to +85 C |
| Maximum CPU Frequency | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Packaging Format | Tape & Reel | Tube | Tube / T&R | Tape & Reel | Tape & Reel |
| Low-Power Technology | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP |
| I/O Pins | 25 | 25 | 25 | 25 | 25 |
| Approx. Unit Price (qty 100) | USD 3.10 | USD 3.10 | USD 3.40 | USD 3.05 | USD 3.05 |
Key Differentiators
- Same-family drop-in across packaging formats (vs PIC18F24K20-I/SS)
- Extended-temperature option in same SSOP-28 footprint (vs PIC18F24K20-E/SS)
- 8 KB Flash cost-down sibling (vs PIC18F23K20T-I/SS)
- SSOP-28 (209 mil) body vs SOIC-28 (300 mil) body (vs PIC18F24K20T-I/SO)
Design Notes
The PIC18F24K20T-I/SS operates from 1.8 V to 3.6 V on VDD/AVDD. Tie AVDD to VDD and AVSS to VSS at the package pins via a wide, short trace; add a 100 nF decoupling cap on each VDD pin and a bulk 4.7-10 uF near the IC. For nanoWatt XLP, switch the CPU to IDLE (CPU off, peripherals running) for periodic ADC tasks, and to SLEEP (full halt) for button-wake tasks driven by INT0-INT2 or IOC. Estimated: at 3.3 V / 1 MHz internal-OSC, typical IDLE is ~8 uA and SLEEP (with RTCC + WDT) is ~0.6 uA per datasheet typical characteristics.
Place the 28-pin SSOP decoupling capacitors within 3 mm of each VDD pin and keep the GND return path short. Reserve RB5 (PGM), RB6 (PGC), and RB7 (PGD) for ICSP so they remain reachable with a 4-pin programming header. When using HF-INTOSC, place the ICSP header where MCLR is accessible - pull MCLR high via 10 kohm, with 100 nF to ground for stable resets during ISP. Keep analog traces (ANx, VREF+, comparators) away from PWM switching traces to avoid coupling noise into the analog channels.
Do not exceed 3.6 V on VDD - the K20 die is not 5 V tolerant. Forgetting to enable the PLL with the OSCTUNE<PLLEN> bit will leave the part running at 8 MHz instead of 64 MHz, hurting PWM resolution. When migrating from PIC18F24J10/2J11, note the K20 has 256 B EEPROM and HF-INTOSC source differs - update configuration words (CONFIG1H). Configuration bits can only be cleared via ICSP programmer bulk erase - design the board so all MCLR/PGx signals are reachable in production.
The 28-pin SSOP thermal resistance is approximately theta_JA ~ 90 C/W, which is fine for typical industrial embedded loads. At full 64 MHz with all peripherals active, the K20 draws ~10 mA from 3.3 V, so dissipation is ~33 mW - negligible thermal stress. For enclosed designs above 70 C ambient, derate FCPU or use sleep/idle more aggressively to stay within the 85 C industrial ceiling.
Compliance Information
RoHS and lead-free per Microchip product page and distributor listings; AEC-Q100 not declared (industrial grade only); REACH compliance per Microchip substance declaration.
