PIC18F1320-I/SS - 8-bit 40MHz MCU 8KB Flash 20-SSOP | Microchip
MPN: PIC18F1320-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.52 | $1.52 |
| 10 | $1.43 | $14.30 |
| 100 | $1.28 | $128.00 |
| 500 | $1.15 | $575.00 |
| 1,000 | $1.02 | $1,020.00 |
| 3,000 | $0.89 | $2,670.00 |
PIC18F1320-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (flash/ROM), data memory (RAM), and programmable I/O peripherals. The PIC18 family specifically represents Microchip's high-performance 8-bit architecture built on the PIC (Peripheral Interface Controller) RISC design philosophy, sitting between the baseline PIC10/12/16 families and the 16-bit dsPIC/PIC24 families. The PIC18F1320 belongs to the 18/20/28-pin low-power family optimized for cost-sensitive embedded control.
Key features include Microchip's nanoWatt Technology with six software-controlled power-managed modes (Run, Idle, Sleep, and three low-power variants) achieving standby current as low as 0.1 microamps; a 10-bit ADC with 7 channels for analog sensor interfacing; a USART module for asynchronous/synchronous serial communication; and an enhanced instruction set with C-compiler-friendly C18 compiler support. The 20-pin SSOP package enables compact PCB designs while maintaining good thermal and electrical performance for industrial-grade applications.
The PIC18F1320 uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution (200 ns at 20 MHz / 100 ns at 40 MHz with 4x PLL), and supports in-circuit serial programming (ICSP) for field firmware updates. The flash program memory supports 100,000 erase/write cycles and >40 years of data retention, making it suitable for long-lifecycle embedded products.
Typical applications include battery-powered sensor nodes, home appliance controls, HVAC thermostats, automotive body electronics (non-safety-critical), industrial control modules, and consumer electronics requiring low-power 8-bit processing. The 16 I/O pins and 7 ADC channels support typical sensor aggregation designs with digital outputs.
When designing with the PIC18F1320-I/SS, pay attention to the industrial temperature grade (-40C to +85C) and ensure the chosen crystal or oscillator meets the 40 MHz timing budget. Use Microchip's MPLAB X IDE with the XC8 compiler for development; the device is supported by the full PIC18 toolchain including in-circuit debuggers and programmers.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F1320-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 PIC18F1320-I/SS (same form factor and footprint) — differing in Package, Timers, ADC, Core Architecture, Internal Oscillator.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F1220-I/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F1220T-I/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F1220-H/SS
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F1220-E/SS
✅ Drop-In✓ In Stock
$2.84 / Unit
View Datasheet →PIC16LF872-I/SS
✅ Drop-In✓ In Stock
$2.34 / Unit
View Datasheet →PIC16LF873A-I/SP
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.78 / Unit
View Datasheet →PIC18F1320-I/SS Maximum Ratings & Electrical Characteristics
| Architecture | PIC18 8-bit RISC |
| CPU Core | 8-bit PIC18F |
| Maximum CPU Frequency | 40 MHz (10 MIPS) |
| Program Memory (Flash) | 8 KB (4K x 16 words) |
| RAM | 256 bytes |
| I/O Pins | 16 |
| ADC | 10-bit, up to 7 channels |
| Supply Voltage | 2.0 V to 5.5 V |
| Operating Temperature (Industrial) | -40 C to +85 C |
| Package | 20-pin SSOP (5.3 mm body) |
| Mounting Type | Surface Mount |
| Communication Interfaces | USART/SCI |
| Power-Saving Modes | nanoWatt Technology, 6 power-managed modes, 0.1 uA standby |
| In-Circuit Programming | ICSP supported |
| RoHS Status | Compliant |
PIC18F1320-I/SS Pin Configuration
| Pin 1 | RA5/MCLR/VPP — Digital I/O / Master Clear (reset) / Programming voltage input |
| Pin 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 4 | RA2/AN2/VREF- — Digital I/O / Analog input channel 2 / ADC negative reference |
| Pin 5 | RA3/AN3/VREF+ — Digital I/O / Analog input channel 3 / ADC positive reference |
| Pin 6 | RA4/AN4 — Digital I/O / Analog input channel 4 |
| Pin 7 | RA5/AN5 — Digital I/O / Analog input channel 5 |
| Pin 8 | RA6/OSC2/CLKO — Digital I/O / Oscillator crystal output / Clock output |
| Pin 9 | RA7/OSC1/CLKI — Digital I/O / Oscillator crystal input / Clock input |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Pin 12 | RB0/INT0/AN6 — Digital I/O / External interrupt 0 / Analog input channel 6 |
| Pin 13 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 14 | RB2 — Digital I/O |
| Pin 15 | RB3 — Digital I/O |
| Pin 16 | RB4 — Digital I/O |
| Pin 17 | RB5 — Digital I/O |
| Pin 18 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 19 | RB7/PGD — Digital I/O / ICSP data |
| Pin 20 | RA4 — Digital I/O (Note: pin 20 in SSOP-20; refer to datasheet for exact assignment) |
Typical Applications
PIC18F1320-I/SS is suitable for 6 applications: Battery-Powered Sensor Nodes, Home Appliance Control, HVAC Thermostats, Industrial Control Modules, Automotive Body Electronics, Consumer Electronics Control.
Battery-Powered Sensor Nodes
The PIC18F1320-I/SS is a strong fit for battery-powered sensor nodes because its nanoWatt Technology achieves standby current as low as 0.1 microamps, extending coin-cell life to multiple years. The 8 KB flash comfortably hosts small sensor fusion routines and wireless protocol stacks (e.g., simple proprietary RF or low-rate LoRa preamble handling). The wide 2.0V to 5.5V supply allows direct operation from a single Li-ion cell (3.0-4.2V) or two alkaline AA cells (2.0-3.2V) without boost converters, and the 10-bit ADC with up to 7 channels aggregates multiple analog sensors (temperature, humidity, light) into a single low-BOM MCU. Compared to switching to a more powerful ARM Cortex-M0+, the PIC18F1320's 40 MHz/10 MIPS performance is sufficient for periodic sensing duty cycles below 1%, where power is dominated by sleep current rather than active compute. Pair with a low-power RF transceiver or energy-harvesting front-end for a complete IoT node.
Recommended
Home Appliance Control
For home appliance controls such as coffee makers, rice cookers, washing machine user interfaces, and small kitchen appliances, the PIC18F1320-I/SS provides a cost-optimized 8-bit solution with adequate flash for state-machine firmware and capacitive touch libraries. Its 16 I/O pins drive LED indicators, button matrices, relay outputs, and segment-LCD control while the 7-channel 10-bit ADC reads temperature sensors (NTC), water level probes, and humidity elements. The 40 MHz / 10 MIPS core executes timing-critical control loops at sub-millisecond resolution for thermal regulation and motor sequencing. The 20-pin SSOP package reflows cleanly onto small mainboards, and the industrial -40C to +85C temperature rating covers unheated appliance interiors. Compared to discrete logic or a PIC10/12 baseline, the PIC18F1320's larger flash eliminates external memory and its C-compiler support reduces firmware development time.
Recommended
HVAC Thermostats
In HVAC thermostat designs the PIC18F1320-I/SS serves as the central control MCU, sampling temperature from NTC thermistors via its 7-channel 10-bit ADC, driving TRIAC-controlled HVAC loads via PWM outputs, and managing user interface LCDs or segment displays through its 16 I/O pins. The 8 KB flash is sufficient for proportional-integral (PI) control loops, weekly schedule storage, and simple BLE/Zigbee protocol bridging when paired with an external radio module over USART. nanoWatt Technology with 0.1 uA standby is critical for line-powered thermostats that retain battery-backed RTC during power loss, and the 2.0V-5.5V supply allows direct operation from a single CR2032 backup cell. The 20-pin SSOP is small enough to fit behind wall plates with Wi-Fi modules stacked above it, and Microchip's longevity program ensures multi-decade availability.
Recommended
Industrial Control Modules
The PIC18F1320-I/SS is well-suited for industrial control modules such as PLC expansion I/O, sensor transmitter heads, and DIN-rail mounted signal conditioners where the -40C to +85C industrial temperature grade is mandatory. Its 8 KB flash hosts Modbus RTU slave firmware over the integrated USART, and the 10-bit ADC digitizes 4-20 mA current loop inputs from field sensors. The 16 I/O pins drive optocoupler-isolated outputs and accept 24V digital inputs through resistor dividers. nanoWatt Technology reduces heat dissipation in sealed enclosures, and the 20-pin SSOP package is compact for dense I/O carrier boards. Compared to bare PIC16F parts, the PIC18F1320's hardware multiplier accelerates floating-point math and its linear flash map simplifies firmware maintenance across product variants.
Recommended
Automotive Body Electronics
Although not AEC-Q100 qualified, the PIC18F1320-I/SS is commonly used in non-safety automotive body electronics applications such as seat heaters, mirror adjusters, ambient lighting controllers, and aftermarket accessories. Its industrial -40C to +85C rating covers cabin environments, while the 8 KB flash holds LIN slave protocol stacks over the USART plus application logic for motor PWM control. The 7-channel ADC reads potentiometer positions and temperature sensors, while 16 I/O pins drive LED arrays and H-bridge motor drivers. Note that AEC-Q100 qualified parts like the PIC18F25K22 must be selected for under-hood or safety-critical body modules; the standard PIC18F1320 suits only cabin-temperature, non-safety designs. The 20-pin SSOP supports miniaturized accessory PCBs.
Recommended
Consumer Electronics Control
In consumer electronics such as remote controls, smart wearables, fitness trackers, and small audio accessories, the PIC18F1320-I/SS provides cost-effective 8-bit processing with low standby power for battery life extension. Its USART interfaces with Bluetooth Low Energy modules or IR transceivers, while the 10-bit ADC reads battery voltage, button press levels, and analog sensors. The 8 KB flash stores device firmware and small lookup tables, and the 16 I/O pins drive haptic motors, RGB LEDs, and capacitive touch electrodes. Compared to ARM Cortex-M0+ alternatives, the PIC18F1320's simpler toolchain and lower unit cost (~$1.50 at qty-1) favor high-volume consumer SKUs where margins are tight. The 20-pin SSOP is well-suited for wearable form factors where PCB area is at a premium.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F1320-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F1220-I/SS | PIC18F1220T-I/SS | PIC18F1220-H/SS | PIC18F1220-E/SS | PIC16LF872-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same |
| Flash Memory | 8 KB | 4 KB | 4 KB | 4 KB | 4 KB | 7 KB |
| RAM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 128 bytes |
| CPU Architecture | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC16 8-bit mid-range |
| Maximum Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 20 MHz |
| ADC | 10-bit, 7 channels | 10-bit, 7 channels | 10-bit, 7 channels | 10-bit, 7 channels | 10-bit, 7 channels | 10-bit, 5 channels |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | High-temp (-40C to +125C) | Extended (-40C to +125C) | Industrial (-40C to +85C) |
Key Differentiators
- Largest flash in 20-pin PIC18 family (vs PIC18F1220-I/SS)
- Higher performance vs PIC16 mid-range (vs PIC16LF872-I/SS)
- nanoWatt Technology for low-power designs (vs PIC18F1230-I/P (same family, motor control variant))
Design Notes
The PIC18F1320-I/SS nanoWatt Technology supports six power-managed modes: Run, Idle, Sleep, and three low-power variants (Sleep with WDT, RC_RUN, and PRI_RUN). For battery-powered designs, switch to Sleep mode whenever possible - typical sleep current is below 1 uA and can reach 0.1 uA in deep-sleep configurations per the datasheet. Always verify the actual current with a multimeter rather than trusting typical values, since leakage varies with temperature and I/O state. Use the internal 31 kHz LFINTOSC as the Sleep wake-up clock to minimize active-mode current spikes.
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 11) and a bulk capacitor (4.7 uF to 10 uF) at the board's power entry. Connect VSS (pin 10) directly to a ground plane via the shortest possible trace. For analog accuracy on the 10-bit ADC, separate the AVSS/AVDD analog supply routing from noisy digital traces when possible - the PIC18F1320 does not have separate analog supply pins but you can add an RC filter on VDD. Keep the MCLR pin (pin 1) either tied to VDD through a 10 kohm resistor or unused with internal pull-up enabled to prevent spurious resets.
When migrating PIC18F1220 code to PIC18F1320, remember that PIC18F1320 has 8 KB flash while PIC18F1220 has only 4 KB - if your linker script was sized for 4 KB it will fail on PIC18F1320 until recompiled with the larger memory map. Conversely, do not program a PIC18F1320 firmware image into a PIC18F1220 - the extra flash pages are undefined on PIC18F1220 and may cause incorrect program counter behavior. Always verify the device ID using the ICSP DevID register before programming. Also note the industrial temperature grade (-40C to +85C) is required for any outdoor or under-hood automotive use; for true AEC-Q100 automotive designs select PIC18F25K22 or PIC18F46K22 instead.
Use Microchip's recommended SSOP-20 land pattern from IPC-7351 with 0.0256 inch (0.65 mm) pitch. Keep analog traces (RA0-RA5) short and away from high-frequency digital signals to minimize ADC noise coupling. Add a guard ring around the analog input traces connected to AVSS if high-impedance sensor signals are involved. The exposed thermal pad on SSOP is not present on this package - thermal management is purely through the package leads and PCB copper pour. Use the largest practical copper area on VDD/VSS for thermal sinking.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F25K22 or PIC18F46K22 for automotive-grade designs. Lead-free packaging per JEDEC J-STD-020 MSL classification (specific MSL level not confirmed in verified data - see [DATA_NEEDED] in specs).
