PIC16F18456-I/SS - 32MHz 8-bit XLP MCU, 28KB Flash | Microchip
MPN: PIC16F18456-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.11 | $2.11 |
| 10 | $1.93 | $19.30 |
| 100 | $1.71 | $171.00 |
| 500 | $1.52 | $760.00 |
| 1,000 | $1.34 | $1,340.00 |
PIC16F18456-I/SS Overview
An 8-bit microcontroller (MCU) is a single-chip microprocessor with an 8-bit data path, on-chip Flash, RAM, peripherals, and a CPU core optimized for embedded control. The PIC16F184xx family belongs to the broader category of PIC microcontrollers -> 8-bit microcontrollers -> microcontrollers (MCU) -> integrated circuits (IC). The 'F' suffix indicates Flash program memory; the '18456' denotes a specific member of the PIC16F184xx family, distinguished from its PIC16F18455 sibling by memory size and peripheral count.
Key features include 28KB Flash, 2KB RAM, 256B EEPROM, a 12-bit ADC with Computation (ADCC), two PWM modules, a 5-bit DAC, comparators, CWG (Complementary Waveform Generator), and EUSART plus two SPI/I2C interfaces. The XLP architecture delivers nanoWatt technology with idle currents below 1 uA in sleep mode with peripheral clock gating, making the part suitable for battery-powered designs.
The architecture combines a Harvard RISC core with Core Independent Peripherals (CIPs) that operate without CPU intervention, offloading tasks such as signal conditioning, motor control timing, and communications. The 12-bit ADCC includes averaging, burst averaging, and threshold interrupts, simplifying sensor front-ends. The 32MHz internal oscillator eliminates external crystals for many cost-sensitive designs.
Typical applications include IoT sensor nodes, battery-powered remote controls, low-power wireless sensor platforms, white goods and appliance controls, LED lighting controllers, and general-purpose embedded control with analog signal conditioning. The wide operating voltage and rich peripheral mix support both consumer and industrial segments.
When designing with this device, plan pin allocations for the analog-capable pins (ANx) and PPS-mapped functions early - PPS reassignment of digital peripherals is flexible but must respect analog channel priorities. Decouple VDD with at least a 100 nF ceramic close to the pins and follow Microchip's recommended PCB layout for SSOP-28 thermal dissipation at high ambient temperatures.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet to accelerate BOM selection and schematic review.
Drop-in alternatives for PIC16F18456-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 PIC16F18456-I/SS (same form factor and footprint) — differing in Package, ADC, Mounting Type, Core Architecture, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F18456-I/SP
✅ Drop-In✓ In Stock
$1.07 / Unit
View Datasheet →PIC16F18456-I/SO
✅ Drop-In✓ In Stock
$1.72 / Unit
View Datasheet →PIC16F18456-E/SS
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →PIC16F18455-I/SS
✅ Drop-In✓ In Stock
$0.85 / Unit
View Datasheet →PIC16F18455T-I/SS
✅ Drop-In✓ In Stock
$1.05 / Unit
View Datasheet →PIC16F18446-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F18456-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Series | PIC16F184xx (XLP) |
| Program Memory (Flash) | 28 KB (16K x 14 words) |
| Data RAM | 2 KB |
| Data EEPROM | 256 B |
| Maximum CPU Frequency | 32 MHz |
| Operating Voltage Range | 2.3 V to 5.5 V |
| ADC | 12-bit ADCC with computation |
| DAC | 5-bit DAC |
| PWM Modules | 2 |
| Comparators | Yes |
| CWG | Complementary Waveform Generator |
| Communication | EUSART, 2x SPI/I2C |
| Package | 28-pin SSOP (5.30 mm body) |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC16F18456-I/SS Pin Configuration
| Pin 1 | VDD — Positive supply voltage |
| Pin 2 | RA5 — Bidirectional I/O / MCLR alternative |
| Pin 3 | RA4 — Bidirectional I/O |
| Pin 4 | RA3 — Bidirectional I/O |
| Pin 5 | RA2 — Bidirectional I/O / analog input |
| Pin 6 | RA1 — Bidirectional I/O / analog input |
| Pin 7 | RA0 — Bidirectional I/O / analog input |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7 — Bidirectional I/O / OSC1 |
| Pin 10 | RA6 — Bidirectional I/O / OSC2 |
| Pin 11 | RC0 — Bidirectional I/O / analog input |
| Pin 12 | RC1 — Bidirectional I/O / analog input |
| Pin 13 | RC2 — Bidirectional I/O / analog input |
| Pin 14 | RC3 — Bidirectional I/O / analog input |
| Pin 15 | RC4 — Bidirectional I/O / analog input |
| Pin 16 | RC5 — Bidirectional I/O / analog input |
| Pin 17 | RC6 — Bidirectional I/O / analog input |
| Pin 18 | RC7 — Bidirectional I/O / analog input |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0 — Bidirectional I/O / analog input |
| Pin 22 | RB1 — Bidirectional I/O / analog input |
| Pin 23 | RB2 — Bidirectional I/O / analog input |
| Pin 24 | RB3 — Bidirectional I/O / analog input |
| Pin 25 | RB4 — Bidirectional I/O / analog input |
| Pin 26 | RB5 — Bidirectional I/O / analog input |
| Pin 27 | RB6 — Bidirectional I/O / analog input |
| Pin 28 | RB7 — Bidirectional I/O / analog input |
Typical Applications
PIC16F18456-I/SS is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, White Goods and Appliance Control, LED Lighting and Dimmer Controllers, Industrial Sensor Signal Conditioning, Remote Control and Human Interface Devices, Portable Medical and Health Monitoring.
Battery-Powered IoT Sensor Nodes
The PIC16F18456-I/SS's XLP nanoWatt technology with sub-1 uA sleep current and 12-bit ADCC makes it ideal for battery-powered IoT sensor nodes. With 28 KB Flash the part fits BLE/LoRaWAN sensor stacks, and the 2 KB RAM supports buffer-heavy sensor fusion. The wide 2.3V to 5.5V VDD suits 2xAA, CR2032, and Li-Ion chemistries. Estimated battery life at 1 sample/hour with radio duty-cycling exceeds 3 years on 2xAA, making it suitable for wireless environmental sensors, smart agriculture nodes, and asset trackers.
Recommended
White Goods and Appliance Control
The PIC16F18456-I/SS suits white goods such as washing machines, dishwashers, and microwave ovens thanks to its CIP peripherals (CWG, PWM, comparators) that handle motor drive and sensor feedback without CPU load. The 32 MHz CPU and 28 KB Flash support user-interface state machines and capacitive-touch libraries. The 12-bit ADCC reads NTC temperature sensors and motor current shunts with averaging, while EUSART and SPI interfaces connect to display modules and inverter sub-systems.
Recommended
LED Lighting and Dimmer Controllers
The PIC16F18456-I/SS drives constant-current LED controllers via its CWG (Complementary Waveform Generator) and 2 PWM modules. The 12-bit ADCC samples light-level feedback for closed-loop dimming, while the 5-bit DAC provides offset trim. XLP idle current keeps standby power under 50 mW for ENERGY STAR compliance. The EUSART and I2C interfaces accept wireless control commands from BLE bridges, while SPI drives external LED driver ICs in architectural lighting.
Recommended
Industrial Sensor Signal Conditioning
The PIC16F18456-I/SS's 12-bit ADCC with computation, 5-bit DAC, and on-chip comparators form a complete analog front-end for industrial 4-20 mA loop sensors, thermocouples, and strain gauges. CIPs handle oversampling averaging and threshold interrupts without CPU intervention. The 32 MHz CPU runs calibration and linearization math, while EUSART streams processed data to PLCs. The industrial temperature grade supports factory-floor and outdoor installations.
Recommended
Remote Control and Human Interface Devices
The PIC16F18456-I/SS powers universal remote controls, BLE button panels, and capacitive-touch keypads. Its 2 KB RAM supports HID descriptor handling and pairing state machines, while 28 KB Flash stores IR code libraries and BLE profiles. XLP sleep modes extend coin-cell battery life; integrated comparators detect user key presses via wake-on-touch. SPI/I2C connect to OLED displays and BLE modules for HMI feedback in smart-home panels.
Recommended
Portable Medical and Health Monitoring
The PIC16F18456-I/SS fits portable medical devices such as pulse oximeters, glucometers, and fitness bands. The 12-bit ADCC with averaging reads photoplethysmography (PPG) signals from red/IR LEDs with high SNR, while XLP sleep preserves battery life between measurements. The 28 KB Flash supports Bluetooth stack fragments and FDA-style firmware partitioning; the 256-byte EEPROM stores calibration constants safely through firmware updates.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F18456-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F18456-I/SP | PIC16F18456-I/SO | PIC16F18456-E/SS | PIC16F18455-I/SS | PIC16F18446-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin SSOP | SPDIP-28 (through-hole, same pinout) | SOIC-28 (wider body, same pitch) | 28-pin SSOP - same | 28-pin SSOP - same | 28-pin SSOP - same |
| Maximum CPU Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Operating Voltage Range | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +125C (Extended) | -40C to +85C | -40C to +85C |
| ADC Resolution | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC | 12-bit ADCC |
| XLP Sleep Current | < 1 uA | < 1 uA | < 1 uA | < 1 uA | < 1 uA | < 1 uA |
Key Differentiators
- Doubled Flash and RAM vs PIC16F18455 in same SSOP-28 footprint (vs PIC16F18455-I/SS)
- Extended temperature option in same footprint (vs PIC16F18456-I/SP)
- Industrial XLP variant vs hobby-grade SPDIP (vs PIC16F18456-I/SP)
Design Notes
Decouple VDD (pins 1 and 28) and VSS (pins 8 and 19) with at least a 100 nF X7R ceramic capacitor placed within 3 mm of the package, plus a bulk 1 uF to 10 uF on the main VDD rail. For battery-powered designs, leverage XLP sleep modes (Sleep, Doze, Idle) and peripheral clock gating to drop quiescent current below 1 uA. Verify that any unused analog inputs are configured as digital outputs or disabled to prevent leakage.
Route the analog signal traces (ANx) away from digital switching lines, especially PWM and CWG outputs, to minimize ADC coupling. Use a ground pour under the SSOP-28 thermal pad area and stitch vias along the perimeter to reduce EMI. Place the 12-bit ADCC reference decoupling capacitor close to the VREF pin if used; Microchip recommends a 0.1 uF + 10 uF parallel combination.
When migrating from PIC16F18455 to PIC16F18456, ensure the linker script is updated to map the larger Flash and RAM regions. Watch for configuration bit changes between family members - especially WDT, LVP, and oscillator selection - that may have different reset defaults. Pin 4 is shared between MCLR (when configured) and RA5; verify the PPS and APFCON settings match your design intent before locking the schematic.
Compliance Information
RoHS and REACH compliant per Microchip product page; standard industrial grade is not AEC-Q100 qualified - select PIC16F18456-E/SS or AEC-Q100 specific PIC part numbers for automotive designs.
