PIC16F18857-I/SSVAO - 56KB Flash 8-Bit MCU w/ FuSa, SSOP-28 | Microchip
MPN: PIC16F18857-I/SSVAO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.07 | $30.70 |
| 100 | $2.73 | $273.00 |
| 500 | $2.46 | $1,230.00 |
| 1,000 | $2.18 | $2,180.00 |
PIC16F18857-I/SSVAO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (RAM), non-volatile EEPROM, and a rich set of peripherals such as timers, ADC, comparators, and communication interfaces. PIC microcontrollers are widely used in embedded designs due to their deterministic RISC architecture, low power consumption, and rich peripheral integration. PIC MCUs sit within the broader taxonomy: microcontroller -> embedded processor -> semiconductor -> integrated circuit.
Key features of the PIC16F18857-I/SSVAO include 56KB self-programmable Flash with device information area, 4KB SRAM, 256B EEPROM, 32MHz internal oscillator, 10-bit ADC with computation (ADC2), 5-bit/8-bit DAC, multiple PWM modules, CWG (Complementary Waveform Generator), DSM (Data Signal Modulator), 2x I2C/SPI, 2x UART with LIN support, and eXtreme Low Power modes (Sleep, Idle, Doze). The device also integrates a Hardware Limit Timer (HLT), CRC/SCAN, and a Peripheral Pin Select (PPS) for flexible signal routing. The 28-SSOP package keeps the design compact while exposing up to 25 I/O pins.
Typical applications for this part include automotive body and convenience modules, sensor node signal conditioning, low-power IoT edge nodes, battery-powered industrial sensors, and any application requiring functional safety documentation (FuSa). The device's AEC-Q100 automotive process flow (the AO suffix) makes it especially suitable for non-safety-critical automotive subsystems where automotive-grade traceability is required.
When designing with this MCU, ensure the programming/debug connector (ICSP) is routed to PGC/PGD pins and that VDD decoupling uses a 100nF ceramic capacitor placed within 5mm of the supply pin. PPS remapping should be planned early in the schematic because not all peripheral functions are available on every pin.
This page synthesizes distributor pricing for the PIC16F18857-I/SSVAO, drop-in same-package alternatives (e.g. PIC16F18855-I/SSVAO), and practical design notes that supplement the manufacturer datasheet.
Drop-in alternatives for PIC16F18857-I/SSVAO — 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/SSVAO (same form factor and footprint) — differing in ADC, Package, Program Memory (Flash), RAM, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F18856-I/SSVAO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F18855-I/SSVAO
✅ Drop-In✓ In Stock
$2.08 / Unit
View Datasheet →PIC16LF18857-I/SSVAO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F18857-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F18857-E/SSVAO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F18857-I/SSVAO Maximum Ratings & Electrical Characteristics
| Series | PIC16 XLP 16F, Functional Safety (FuSa) |
| Core | 8-bit PIC16 enhanced mid-range |
| Program Memory (Flash) | 56 KB |
| RAM | 4 KB |
| EEPROM | 256 B |
| Maximum CPU Speed | 32 MHz |
| Operating Voltage (VDD) | 1.8 V to 5.5 V |
| Number of I/O Pins | 25 |
| ADC | 10-bit ADC2 with computation |
| DAC | 5-bit and 8-bit DAC modules |
| Timers | Multiple 8/16-bit timers with HLT |
| PWM | Yes (multiple PWM outputs) |
| Communication Interfaces | 2x I2C/SPI, 2x UART (LIN) |
| Package | 28-pin SSOP |
| Operating Temperature | -40C to +85C (industrial grade) |
| Mounting Type | Surface Mount |
| Process Flow | Automotive (VAO suffix) |
| Low Power Features | XLP - Sleep/Idle/Doze modes |
PIC16F18857-I/SSVAO Pin Configuration
| Pin 1 | RA5 — Bidirectional I/O with PPS |
| Pin 2 | RA4 — Bidirectional I/O with PPS |
| Pin 3 | RA3 — Bidirectional I/O with PPS, MCLR/VPP |
| Pin 4 | RC5 — Bidirectional I/O with PPS |
| Pin 5 | RC4 — Bidirectional I/O with PPS |
| Pin 6 | RC3 — Bidirectional I/O with PPS |
| Pin 7 | RC2 — Bidirectional I/O with PPS |
| Pin 8 | RC1 — Bidirectional I/O with PPS |
| Pin 9 | RC0 — Bidirectional I/O with PPS |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage (1.8V to 5.5V) |
| Pin 12 | RB7 — Bidirectional I/O with PPS, ICSP PGD |
| Pin 13 | RB6 — Bidirectional I/O with PPS, ICSP PGC |
| Pin 14 | RB5 — Bidirectional I/O with PPS |
| Pin 15 | RB4 — Bidirectional I/O with PPS |
| Pin 16 | RB3 — Bidirectional I/O with PPS |
| Pin 17 | RB2 — Bidirectional I/O with PPS |
| Pin 18 | RB1 — Bidirectional I/O with PPS |
| Pin 19 | RB0 — Bidirectional I/O with PPS, interrupt-on-change |
| Pin 20 | VDD — Positive supply voltage (1.8V to 5.5V) |
| Pin 21 | VSS — Ground reference |
| Pin 22 | RA7 — Bidirectional I/O with PPS, OSC1 |
| Pin 23 | RA6 — Bidirectional I/O with PPS, OSC2 |
| Pin 24 | RA2 — Bidirectional I/O with PPS |
| Pin 25 | RA1 — Bidirectional I/O with PPS |
| Pin 26 | RA0 — Bidirectional I/O with PPS |
| Pin 27 | RC7 — Bidirectional I/O with PPS |
| Pin 28 | RC6 — Bidirectional I/O with PPS |
Typical Applications
PIC16F18857-I/SSVAO is suitable for 6 applications: Automotive Body Control Modules, Battery-Powered IoT Sensor Nodes, Industrial Sensor Signal Conditioning, Consumer Appliance Control Panels, Portable Medical Monitoring Devices, LED Lighting and Driver Control.
Automotive Body Control Modules
The PIC16F18857-I/SSVAO is well suited to automotive body and convenience subsystems because its VAO process flow provides AEC-Q100 traceability and PPAP support, while its 56KB Flash / 4KB RAM comfortably hosts LIN stack, lighting control, and seat/door/window algorithms. The integrated 2x UART with LIN 2.2 support eliminates the need for an external LIN transceiver controller, and the 32MHz CPU delivers 8 MIPS for multi-channel PWM dimming. Unlike larger Cortex-M0+ parts, this PIC16 also adds CIPs like CWG and DSM, reducing BOM cost by replacing dead-band ICs and analog modulators. For body controllers operating from 12V automotive rails, the wide 1.8V-5.5V VDD range lets a single LDO supply the MCU and sensors.
Recommended
Battery-Powered IoT Sensor Nodes
The PIC16F18857-I/SSVAO targets low-power IoT edge nodes thanks to eXtreme Low Power (XLP) technology with Sleep currents under 50 nA typical with the 31kHz LFINTOSC. The 56KB Flash holds small RTOS kernels or protocol stacks like Modbus RTU, while the integrated 10-bit ADC2 with computation performs averaging, oversampling, and threshold comparison in hardware, waking the CPU only when a meaningful event occurs. PPS allows the sensor's analog front-end to be routed to any I/O, simplifying PCB layout. Compared to a discrete MCU + external ADC approach, the integrated ADC2 + DACs + temperature indicator cut the BOM to a single IC plus a passive sensor bridge.
Recommended
Industrial Sensor Signal Conditioning
In industrial 4-20mA loop transmitters, RTD/thermocouple signal chains, and bridge sensor interfaces, the PIC16F18857-I/SSVAO provides the analog-front-end integration needed to replace several op-amps and a dedicated ADC. The on-chip 10-bit ADC2 with hardware oversampling reaches effective 14-bit resolution, the 5/8-bit DACs support loop excitation, and the CWG/DSM generate the stimulus for sensor modulation. With 32MHz operation, the MCU can sample at 100kS/s while running a digital filter, all within the -40C to +85C industrial window. CIPs like HLT (Hardware Limit Timer) provide fast over-current protection without CPU latency.
Recommended
Consumer Appliance Control Panels
For white-goods control boards (washing machines, dishwashers, microwave ovens), the PIC16F18857-I/SSVAO provides capacitive-touch sensing via the ADC2 CTMU peripheral, multiple PWM outputs for motor/valve control, and UART/I2C for keypad/HMI communication. The 56KB Flash stores UI state machines and safety routines, while the 4KB RAM supports a small RTOS or non-preemptive scheduler. CIPs like the Complementary Waveform Generator (CWG) directly drive half-bridge motor drivers with built-in dead-band, eliminating external timing ICs. XLP Sleep modes drop the MCU below 1uA when the appliance is in standby, meeting Energy Star targets.
Recommended
Portable Medical Monitoring Devices
In portable medical devices such as pulse oximeters, blood-pressure monitors, and personal EKG/ECG wearables, the PIC16F18857-I/SSVAO offers the functional-safety (FuSa) documentation, low-power XLP Sleep, and 10-bit ADC2 hardware computation needed for biometric signal processing. The 32MHz MIPS performance can run simple FFT-based heart-rate detection algorithms in firmware, while CIPs (CWG/DSM) handle sensor excitation. The wide VDD range allows a single 3.7V Li-Ion cell to power the MCU plus analog front end without a boost converter. Compared to ARM Cortex-M0 MCUs at this price point, the PIC16F18857 integrates more analog peripherals per square mm.
Recommended
LED Lighting and Driver Control
The PIC16F18857-I/SSVAO is well matched to commercial and architectural LED lighting drivers, where multiple independent LED strings must be PWM-dimmed with precise color-mixing. The CWG peripheral generates complementary PWM outputs with hardware dead-band control, the DSM creates dithered analog references for tunable-white mixing, and PPS routes PWM to any I/O pin for flexible PCB layout. With 56KB Flash, designers can implement DALI, DMX512, or 0-10V dimming protocols without external controllers. Compared to LED driver-only ICs, this PIC adds intelligence for remote diagnostics and per-fixture addressing.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F18857-I/SSVAO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F18856-I/SSVAO | PIC16F18855-I/SSVAO | PIC16LF18857-I/SSVAO | PIC16F18857-I/SS | PIC16F18857-E/SSVAO |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP - same | 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 | 28 KB | 28 KB | 56 KB | 56 KB | 56 KB |
| RAM | 4 KB | 4 KB | 2 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Maximum CPU Speed | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) | 32 MHz (8 MIPS) |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Temperature Grade | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +125C (E) |
| Process Flow | Automotive (VAO) | Automotive (VAO) | Automotive (VAO) | Automotive (VAO) | Standard industrial | Automotive (VAO) |
Key Differentiators
- Maximum Flash in the PIC16F1885X/7X 28-SSOP family (vs PIC16F18855-I/SSVAO)
- Automotive (VAO) process flow with AEC-Q100 traceability (vs PIC16F18857-I/SS)
- Full 5.5V VDD operation for direct 5V sensor interfacing (vs PIC16LF18857-I/SSVAO)
- Industrial -40C to +85C temperature range for non-extended apps (vs PIC16F18857-E/SSVAO)
Design Notes
Place a 100nF ceramic decoupling capacitor within 5mm of each VDD pin (pins 11 and 20 on the 28-SSOP package) and add a bulk 10uF capacitor on the main supply rail. For battery-powered designs, the PIC16F18857-I/SSVAO XLP Sleep current drops below 50nA typical with LFINTOSC, so the LDO must be a low-Iq part such as MCP1700. Sequence the MCU reset after the analog LDO reaches regulation to avoid in-rush current on the 1.8V-5.5V rail. Estimated: Iq contribution from a MCP1700-3302 at 1.6uA quiescent adds <2uA to the overall Sleep budget.
On the 28-SSOP, pin 3 (RA3/MCLR) is shared with the MCLR reset and ICSP VPP function - never tie this pin directly to VDD without a 10k pull-up; use a discrete reset supervisor or RC delay if MCLR is not used in the application. Pins 12 (RB7/PGD) and 13 (RB6/PGC) are also the ICSP programming pins, so place a 4.7k series resistor or buffer if long external traces are routed to these pins to avoid in-circuit programming issues.
The 28-SSOP package has a 0.65mm pitch - use JEDEC MO-150 land pattern with at least 0.4mm solder mask dam between pads. Route the ICSP signals (PGD/PGC) on the top layer with ground keep-out to minimize capacitive loading. Place the decoupling capacitors on the same side as the MCU, as close to pins 11/20 as possible, and use a continuous ground plane on the opposite layer to provide a low-impedance return for switching currents from the PWM/CWG peripherals.
Estimated: At 32MHz CPU speed with all peripherals enabled and 5.5V VDD, the PIC16F18857-I/SSVAO core draws about 8mA typical, dissipating roughly 44mW. The 28-SSOP package has theta_JA around 95C/W on a 1oz 4-layer JEDEC test board, giving a junction temperature rise of only ~4.2C above ambient - well within the 85C industrial ceiling. No heatsinking is required for typical embedded designs.
Compliance Information
AEC-Q100 traceability via VAO automotive process flow per Microchip product family documentation. RoHS and lead-free confirmed per Microchip product page; REACH status inferred from Microchip standard compliance.
