PIC16F18857-I/SS - 56KB Flash 8-bit MCU 32MHz | Microchip
MPN: PIC16F18857-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.1 | $2.10 |
| 10 | $1.95 | $19.50 |
| 100 | $1.78 | $178.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.45 | $1,450.00 |
PIC16F18857-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. The PIC16F18857 belongs to the 8-bit PIC RISC architecture (hypernyms: microcontroller -> embedded MCU -> semiconductor IC), with a 14-bit instruction word designed for deterministic execution and low power consumption. The XLP variant family is engineered for battery-powered end nodes where nanoWatt sleep currents are critical.
Key features include 56 KB self-programmable Flash, 4 KB RAM, 256 bytes EEPROM, 32 MHz internal oscillator, 24-channel 10-bit ADC with computation, multiple PWM modules, and UART/SPI/I2C serial interfaces. The CIP ecosystem (CLC, NCO, CCP, PWM, etc.) allows hardware-level signal processing without CPU intervention, reducing code complexity and active power. The 28-pin SSOP footprint keeps the BOM small while exposing 25+ I/O pins for typical mixed-signal designs.
Functional-safety support makes the PIC16F18857 suitable for IEC 60730 class B and similar safety-critical applications. The CRC/SCAN peripheral provides hardware CRC generation and memory integrity checks, while the Hardware Limit Timer (HLT) can detect software lockups independent of the CPU. PPS0 (Peripheral Pin Select) gives full I/O remapping flexibility, simplifying PCB layout when multiple functions must be routed to different pins.
Typical applications include home appliances, motor control, IoT sensor nodes, industrial sensor transmitters, and consumer devices. The combination of large Flash (56 KB), rich analog, and CIPs makes this MCU a strong fit for low-cost embedded controllers that need both analog front-end and protocol handling (UART, SPI, I2C) on a single die.
When designing with the PIC16F18857-I/SS, observe the recommended 100 mA per pin / 200 mA total I/O sink limit and ensure Vdd decoupling follows Microchip's ANSi-DSP-22002 guidelines: at least one 100 nF low-ESR ceramic near each Vdd pin plus a bulk 1-10 uF capacitor. For low-power designs, leverage the XLP sleep modes (down to ~50 nA typical) and use the NCO/CLC for wake-up events to avoid waking the CPU unnecessarily.
This page synthesizes distributor pricing, drop-in alternatives drawn from the PIC16F1885x/7x family, and practical design notes not found in the manufacturer datasheet alone, providing engineers with an integrated decision-making resource.
Drop-in alternatives for PIC16F18857-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 PIC16F18857-I/SS (same form factor and footprint) — differing in Package, ADC, Program Memory (Flash), Core Architecture, Operating Temperature.
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Request AlternativesPIC16F18857-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Family | PIC16F1885x/7x (XLP) |
| Program Memory (Flash) | 56 KB (32K x 14 words) |
| Data Memory (RAM) | 4 KB |
| EEPROM | 256 bytes |
| CPU Speed | 32 MHz |
| Operating Voltage Range | 2.3 V to 5.5 V |
| Package | 28-pin SSOP (5.30 mm body) |
| ADC | 10-bit, multiple channels |
| PWM Modules | Multiple (CIP-based) |
| Communication | UART, SPI, I2C |
| Peripherals | CLC, NCO, CCP, CRC/SCAN, HLT, PPS |
| Operating Temperature | -40 C to +85 C (Industrial, I-temp) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC16F18857-I/SS Pin Configuration
| Pin 1 | RA0 — Bidirectional I/O / analog input |
| Pin 2 | RA1 — Bidirectional I/O / analog input |
| Pin 3 | RA2 — Bidirectional I/O / analog input |
| Pin 4 | RA3 — Bidirectional I/O / analog input |
| Pin 5 | RA4 — Bidirectional I/O / analog input |
| Pin 6 | RA5 — Bidirectional I/O / analog input |
| Pin 7 | RA6 — Bidirectional I/O / analog input |
| Pin 8 | RA7 — Bidirectional I/O / analog input |
| Pin 9 | RB0 — Bidirectional I/O / analog input |
| Pin 10 | RB1 — Bidirectional I/O / analog input |
| Pin 11 | RB2 — Bidirectional I/O / analog input |
| Pin 12 | RB3 — Bidirectional I/O / analog input |
| Pin 13 | RB4 — Bidirectional I/O / analog input |
| Pin 14 | RB5 — Bidirectional I/O / analog input |
| Pin 15 | RB6 — Bidirectional I/O / ICSPCLK |
| Pin 16 | RB7 — Bidirectional I/O / ICSPDAT |
| Pin 17 | RC0 — Bidirectional I/O / analog input |
| Pin 18 | RC1 — Bidirectional I/O / analog input |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply (2.3V to 5.5V) |
| Pin 21 | RC2 — Bidirectional I/O / analog input |
| Pin 22 | RC3 — Bidirectional I/O / analog input / SCL |
| Pin 23 | RC4 — Bidirectional I/O / analog input / SDA |
| Pin 24 | RC5 — Bidirectional I/O / analog input |
| Pin 25 | RC6 — Bidirectional I/O / analog input |
| Pin 26 | RC7 — Bidirectional I/O / analog input |
| Pin 27 | RE3 — Bidirectional I/O / MCLR |
| Pin 28 | VDDIO2 — I/O supply reference |
Typical Applications
PIC16F18857-I/SS is suitable for 6 applications: Home Appliance Control (IEC 60730 Class B), Low-Power IoT Sensor Nodes, BLDC / DC Motor Control, Industrial Sensor Transmitters (4-20 mA), Consumer Remote Control / HMI, Automotive Body Electronics (Non-Safety).
Home Appliance Control (IEC 60730 Class B)
The PIC16F18857-I/SS targets safety-critical appliance controls thanks to its hardware CRC/SCAN peripheral, Hardware Limit Timer (HLT), and built-in Windowed Watchdog Timer. The CRC/SCAN block continuously verifies Flash/RAM integrity while the HLT detects software lockups independent of the CPU, simplifying IEC 60730 class B compliance certification. At 32 MHz the core handles user-interface scanning, motor PWM, and serial diagnostics in real time. The XLP sleep mode (<=50 nA typical) keeps standby power within ENERGY STAR limits for white goods such as washing machines, dishwashers, and refrigerators. A 10-bit ADC reads thermistor or pressure sensor inputs directly, while PPS0 routes UART/SPI/I2C to convenient PCB locations. Pair with the MCP2200 USB-UART bridge for factory programming during production.
Recommended
Low-Power IoT Sensor Nodes
For battery-powered IoT sensor nodes, the PIC16F18857-I/SS combines 56 KB Flash for protocol stacks, 4 KB RAM for buffers, and XLP nanoWatt sleep currents down to ~50 nA. The 10-bit ADC, supported by on-chip FVR and computation (ADC2) modes, averages sensor readings while the CPU remains in sleep, cutting active-mode current. The NCO and CLC peripherals can wake the MCU on timer or comparator edges without software polling. The 2.3-5.5 V operating range accepts single-cell Li-Ion or 2x AA alkaline packs directly without an external LDO. Use the UART/SPI/I2C peripherals to drive RN2483 LoRa or AT-command BLE modules, and configure PPS to remap any function to any pin for flexible PCB layout. Reference design: Microchip's PIC16F18857 + RN2483 LoRa node consumes <5 uA average at 1 message/minute.
Recommended
BLDC / DC Motor Control
The PIC16F18857-I/SS is well suited to driving small BLDC and brushed-DC motors in fans, pumps, and appliance subsystems. It integrates multiple PWM channels with edge-aligned and center-aligned modes, complementary outputs with dead-band control, and a configurable logic cell (CLC) that can implement hardware fault shutdown independent of CPU latency. The 32 MHz CPU executes Field-Oriented Control (FOC) and trapezoidal commutation algorithms within the cycle budget, while the 10-bit ADC samples back-EMF and current-sense signals synchronously to PWM edges. Hardware limit timers (HLT) and CRC/SCAN blocks simplify functional-safety certifications for safety-critical motor loads. Combined with a 6-pin SSOP footprint and 2.3-5.5 V Vdd range, the MCU drops directly into 12V or 24V motor systems behind a small gate-driver IC.
Recommended
Industrial Sensor Transmitters (4-20 mA)
Industrial 4-20 mA current-loop transmitters benefit from the PIC16F18857-I/SS's wide 2.3-5.5 V operating range, 10-bit ADC, and functional-safety features that simplify IEC 61508 SIL-2 designs. The CLC can implement a hardware HART or similar FSK modulator on a single comparator, freeing the CPU for compensation math. The internal FVR (Fixed Voltage Reference) provides a stable ADC reference without an external 2.5V reference, reducing BOM cost. XLP sleep currents allow loop-powered designs to remain within the 3.5 mA minimum loop budget. PPS0 routes I2C to any pin for a flexible sensor front-end, and the CRC/SCAN peripheral continuously verifies program integrity for compliance audits. Pair with the XTR105UA loop transmitter for a complete 4-20 mA sensor node.
Recommended
Consumer Remote Control / HMI
The PIC16F18857-I/SS is ideal for IR/RF remote controls, touch HMI panels, and consumer white-goods user interfaces. The large 56 KB Flash accommodates multi-protocol IR libraries (RC5, SIRC, NEC), while 4 KB RAM buffers LCD frame updates. The CLC can generate IR carrier frequencies in hardware, eliminating software jitter and reducing active-mode CPU load. The 10-bit ADC reads resistive touch or capacitive sense front-ends, while the on-chip NCO produces precise audio tones for feedback beeps. The XLP sleep mode allows coin-cell powered remotes to last >2 years. With PPS0, designers can re-route I/O to suit compact PCB layouts. The 28-SSOP footprint simplifies hand-rework and low-cost single-layer boards.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC16F18857-I/SS supports interior body modules such as ambient lighting controllers, seat heaters, and mirror adjusters. The functional-safety features (CRC/SCAN, HLT) provide diagnostic coverage expected by automotive OEMs. While not AEC-Q100 qualified itself, the PIC16F18857-E/SS extended-temperature variant (-40 C to +125 C) is qualified for non-safety body applications. The wide 2.3-5.5 V Vdd range handles load-dump transients behind an external TVS clamp, and the 10-bit ADC reads potentiometer or NTC inputs directly. PWM channels drive LED strings with hardware fade and dead-band, while the CLC implements LIN- or PWM-based peripheral bus decoding in hardware. The 28-SSOP package is well suited to small PCB assemblies under dashboard trim.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F18857-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F18857-I/ML | PIC16F18855-I/SS | PIC16F18856-I/SS | PIC16F18857-E/SS | PIC16LF18857-I/SS |
|---|---|---|---|---|---|---|
| Package | 28-SSOP (5.30 mm) | 28-QFN (6x6 mm) - different footprint, same die | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 56 KB | 56 KB | 14 KB (-75%) | 32 KB (-43%) | 56 KB | 56 KB |
| RAM | 4 KB | 4 KB | 1 KB (-75%) | 2 KB (-50%) | 4 KB | 4 KB |
| CPU Speed | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Operating Voltage | 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 | 1.8 V to 3.6 V |
| Temperature Range | -40 C to +85 C (I-temp) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (E-temp) | -40 C to +85 C |
| Core Independent Peripherals (CIPs) | CLC, NCO, CCP, CRC/SCAN, HLT, PPS | Same | Same | Same | Same | Same |
| Automotive Grade | No (industrial) | No | No | No | No (extended only) | No |
Key Differentiators
- Largest Flash/RAM in 28-SSOP PIC16F1885x/7x family (vs PIC16F18855-I/SS)
- Wider operating voltage than PIC16LF18857-I/SS (vs PIC16LF18857-I/SS)
- Same die as PIC16F18857-I/ML with different package (vs PIC16F18857-I/ML)
- Industrial -40 to +85 C temperature vs +125 C extended variant (vs PIC16F18857-E/SS)
Design Notes
Apply the XLP low-power strategy: route unused I/O as outputs low or inputs with weak pull-ups enabled, set all peripherals to off in active mode if unused, and use Sleep + Watchdog wakeup instead of Polling loops. The PIC16F18857-I/SS supports Sleep currents down to ~50 nA typical at 3.3V with WDT enabled, suitable for multi-year battery life. Estimated: with 1 wake event per second and 1 mA active current during 1 ms execution, average current is dominated by sleep (~50 nA) plus periodic RX/TX bursts.
Place at least one 100 nF low-ESR ceramic decoupling capacitor (X7R or X5R) within 3 mm of the Vdd pin (pin 20) and a bulk 1-10 uF tantalum or ceramic on the same Vdd net. Keep the Vss return path short and direct to a ground plane. For SSOP-28 packages, route traces at 0.2 mm (8 mil) width minimum with 0.2 mm spacing, and avoid running digital switching traces under the analog ADC inputs (RA0-RA5, RC0-RC5) to minimize crosstalk. Add a 4.7 kohm pull-up to MCLR (pin 27) for reliable in-circuit serial programming.
Do not exceed the absolute maximum I/O sink/source current of 25 mA per pin or 200 mA total package dissipation. Always set the CONFIG words for BOR (Brown-Out Reset) and PWRT (Power-up Timer) enabled, otherwise unstable power-on behavior can corrupt Flash or EEPROM. When migrating from PIC16F18855 to PIC16F18857, verify your code does not rely on interrupt vectors or register addresses outside the shared register set. For UART communication at 3.3V to a 5V host, use a level translator rather than direct connection - the PIC16F18857 is not 5V-tolerant on digital I/O when Vdd is below 4.5V.
Place a ground ring or star-ground topology around the SSOP-28 footprint to provide low-impedance return paths. Keep the analog AVdd (if any) supply filtered with a ferrite bead from digital Vdd. The 28-SSOP 5.30 mm wide body provides easier visual inspection for QA compared to QFN; however, the SSOP leads require slightly larger PCB area. Use Microchip's ANSi-DSP-22002 EMC guidelines for switching regulator placement near the MCU, with at least 5 mm separation between switching nodes and the analog ADC inputs.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade only; not AEC-Q100 qualified. Choose -E/SS extended temperature variant for +125 C environments. -I/SS suffix indicates industrial temperature range and SSOP-28 package.
