PIC16F1703T-I/ST - 8-bit 32MHz 3.5KB Flash MCU 14-TSSOP | Microchip
MPN: PIC16F1703T-I/ST ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.62 | $1.62 |
| 10 | $1.46 | $14.60 |
| 100 | $1.21 | $121.00 |
| 500 | $1.04 | $520.00 |
| 1,000 | $0.89 | $890.00 |
PIC16F1703T-I/ST Overview
What is a PIC16F microcontroller? The PIC16F family is Microchip's enhanced mid-range 8-bit MCU line built on a RISC architecture, optimized for low power consumption through the XLP (eXtreme Low Power) technology umbrella. MCUs in this class typically integrate Flash program memory, SRAM, on-chip peripherals (ADC, comparators, timers), and communications modules (I2C/SPI/EUSART) onto a single die, serving the power-management, sensor-interface, and consumer-appliance markets that do not require 32-bit performance.
Key features of the PIC16F1703 include on-chip operational amplifiers (Op Amps), Core Independent Peripherals such as the Configurable Logic Cell (CLC) and Zero Cross Detect (ZCD), and Peripheral Pin Select (PPS) for flexible signal routing. The 10-bit ADC with computation support accelerates sensor signal conditioning, while the integrated op-amps reduce external analog component count. PPS allows digital peripheral I/O to be remapped to a wide range of physical pins, simplifying PCB layout when board constraints shift late in design.
Architecturally, the PIC16F1703 uses a Harvard RISC core with a 14-bit instruction word, a single-cycle instruction execution at 32MHz (200ns instruction time), and hardware stack support. The on-chip voltage regulator allows direct operation from 1.8V to 5.5V supplies, making the device compatible with both 3.3V and 5V system rails. XLP technology enables nanoWatt sleep modes with sub-µA current consumption, extending battery life in IoT and remote-sensor nodes.
Typical applications include LED lighting controllers, battery-powered sensor nodes, small appliance control boards, smoke and CO detectors, and general-purpose logic-replacement modules. The combination of integrated op-amps and a 10-bit ADC makes it well-suited for closed-loop analog control, while PPS and CLC support discrete glue-logic replacement. The 14-TSSOP footprint is among the smallest standard MCU packages, enabling compact PCB designs.
When designing with this device, ensure adequate decoupling on VDD (a 0.1µF ceramic plus a bulk cap) and place the ICSP/ICD pins on accessible header pads for in-circuit programming and debugging. Confirm that the chosen clock configuration (HFINTOSC vs external crystal) meets the timing accuracy required by the application. Review the device's electrical characteristics section for I/O pin loading rules when driving LEDs or relays directly from GPIO.
Drop-in alternatives for PIC16F1703T-I/ST — 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 PIC16F1703T-I/ST (same form factor and footprint) — differing in ADC, Package, Core Architecture, Operating Temperature, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1703-I/ST
✅ Drop-In✓ In Stock
$0.84 / Unit
View Datasheet →PIC16F1704-I/ST
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F1503-I/ST
✅ Drop-In✓ In Stock
$0.94 / Unit
View Datasheet →PIC16F1703-E/ST
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →PIC16F1455-I/ST
✅ Drop-In✓ In Stock
$1.31 / Unit
View Datasheet →PIC16F1703T-I/ST Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard, 14-bit instruction word) |
| Program Memory Type | Flash |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 256 B |
| Maximum CPU Frequency | 32 MHz |
| ADC | 10-bit |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Package | 14-TSSOP (ST) |
| Pin Count | 14 |
| Mounting Type | Surface Mount |
| On-chip Op Amps | Yes (integrated) |
| Zero Cross Detect (ZCD) | Yes |
| Peripheral Pin Select (PPS) | Yes |
| XLP (eXtreme Low Power) | Yes |
| RoHS Status | Compliant |
PIC16F1703T-I/ST Pin Configuration
| Pin 1 | VDD — Positive supply voltage |
| Pin 2 | RA5 — I/O port A bit 5 / ICSPDAT |
| Pin 3 | RA4 — I/O port A bit 4 |
| Pin 4 | RA3/MCLR — I/O port A bit 3 / Master Clear (reset) |
| Pin 5 | RA2 — I/O port A bit 2 |
| Pin 6 | RA1 — I/O port A bit 1 / ICSPCLK |
| Pin 7 | RA0 — I/O port A bit 0 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7 — I/O port A bit 7 |
| Pin 10 | RA6 — I/O port A bit 6 |
| Pin 11 | RC5 — I/O port C bit 5 |
| Pin 12 | RC4 — I/O port C bit 4 |
| Pin 13 | RC3 — I/O port C bit 3 |
| Pin 14 | RC2 — I/O port C bit 2 |
Typical Applications
PIC16F1703T-I/ST is suitable for 6 applications: LED Lighting Controllers, Battery-Powered Sensor Nodes, Small Appliance Control, Smoke and CO Detectors, Consumer Electronics Interface Boards, Industrial Logic Replacement.
LED Lighting Controllers
The PIC16F1703T-I/ST fits LED lighting controllers through its integrated Zero Cross Detect (ZCD) and 10-bit ADC, which together enable phase-controlled dimming and accurate current sensing without external zero-cross circuitry. The XLP low-power technology minimizes standby consumption to sub-µA levels, satisfying ENERGY STAR and Ecodesign standby requirements. The 14-TSSOP footprint is small enough for compact GU10 and PAR-style bulb driver boards, and the 32MHz core allows smooth PWM dimming at frequencies above the audible range, eliminating flicker. Pairing the MCU with a Microchip MCP1640 boost converter and MCP73831 battery management IC forms a complete solid-state lighting solution. The CLC peripheral further reduces external glue logic in tunable-white and RGB color-mixing designs, where multiple PWM channels must be synchronized precisely.
Recommended
Battery-Powered Sensor Nodes
For battery-powered sensor nodes, the PIC16F1703T-I/ST delivers XLP nanoWatt sleep modes with sub-µA quiescent current, enabling multi-year battery life on a single CR2032 coin cell. The 1.8V to 5.5V supply range supports direct connection to lithium, alkaline, and rechargeable chemistries without level shifting. On-chip op-amps condition signals from thermistors, photodiodes, or electrochemical gas sensors, reducing external component count and BOM cost in compact sensor PCBs. The 10-bit ADC with computation support offloads averaging and threshold comparison from the CPU, allowing the core to remain in sleep most of the time. PPS allows sensor, communication, and interrupt lines to be remapped to any I/O, simplifying layout when the board outline changes late in design. Pair with a low-power RF transmitter such as the MRF89XA or a sub-GHz module for wireless sensor networks.
Recommended
Small Appliance Control
Small appliance control boards benefit from the PIC16F1703T-I/ST's integrated op-amps, which can directly interface with thermistor or current-sense signals for closed-loop temperature or power regulation. The 32MHz core drives a real-time UI with button debouncing, rotary encoder input, and LED status indication without performance headroom concerns. Peripheral Pin Select allows the PCB designer to assign UART, I2C, and SPI signals to nearly any I/O pin, easing layout when the mechanical enclosure forces a particular pin placement. The 14-TSSOP package fits easily into appliance controller housings. The 10-bit ADC is sufficient for set-point, monitoring, and safety-shutdown sensing in coffee makers, blenders, hair dryers, and similar products. Combined with a CLC for safety interlocks, the MCU replaces discrete logic gates that would otherwise inflate BOM cost.
Recommended
Smoke and CO Detectors
The PIC16F1703T-I/ST is well-suited for smoke and CO detector applications, where integrated op-amps directly interface with photoelectric smoke-chamber photodiodes and electrochemical CO sensors. The on-chip 10-bit ADC with computation support handles baseline-drift compensation and alarm-threshold algorithms without external signal conditioning. XLP technology keeps quiescent current below the 10µA budget typical of 10-year battery-powered smoke alarms, allowing the device to operate from a single 9V battery or sealed lithium pack. Zero Cross Detect can synchronize chirp-pattern generation to AC mains frequency for line-powered detectors, minimizing electrical noise during zero-cross transitions. CLC peripheral implements self-test logic, ensuring horn-driver and sensor-path integrity at every power-on cycle.
Recommended
Consumer Electronics Interface Boards
For consumer electronics interface boards - remote controls, USB accessories, and HID peripherals - the PIC16F1703T-I/ST provides enough Flash (3.5KB) and processing throughput (32MHz) for USB CDC/HID stacks via bit-banged USB or for button/IR protocol decoding. The 14-TSSOP package's compact size suits small remote-control PCBs, while the wide supply range supports direct 3.3V or 5V USB operation. PPS allows easy remapping of USB D+/D- lines, IR receiver, and status LEDs to whichever pins best fit the mechanical case. The integrated op-amp can amplify IR-receiver signals, eliminating an external op-amp in IR remote designs. CLC accelerates encoder/decoder logic, freeing CPU cycles for protocol handling and power management.
Recommended
Industrial Logic Replacement
Industrial logic replacement - the PIC16F1703T-I/ST consolidates discrete 74HC-series glue logic into a single MCU with CLC peripherals implementing state machines, encoder/decoder logic, and timing functions. The 14-TSSOP package fits legacy 14-pin SOIC footprints with minimal PCB rework in many cases. The wide 1.8V to 5.5V supply range and -40C to +85C industrial temperature grade ensure reliable operation in factory-floor environments. PPS and Core Independent Peripherals reduce or eliminate CPU intervention for time-critical signal processing, improving deterministic response versus pure software loops. The 10-bit ADC handles analog set-point inputs and feedback signals in industrial equipment, while the integrated op-amps buffer sensor signals without external active components.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F1703T-I/ST — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1703-I/ST | PIC16F1704-I/ST | PIC16F1503-I/ST | PIC16F1703-E/ST | PIC16F1455-I/ST |
|---|---|---|---|---|---|---|
| Package | 14-TSSOP (ST) | 14-TSSOP (ST) - same | 14-TSSOP (ST) - same | 14-TSSOP (ST) - same | 14-TSSOP (ST) - same | 14-TSSOP (ST) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 3.5 KB | 3.5 KB | 7 KB | 3.5 KB | 3.5 KB | 14 KB |
| Maximum CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 20 MHz | 32 MHz | 48 MHz |
| On-chip Op Amps | Yes | Yes | Yes | No | Yes | No |
| Zero Cross Detect | Yes | Yes | Yes | No | Yes | No |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
| Supply Voltage Range | 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 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Operating Temperature Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C (extended) | -40C to +85C |
Key Differentiators
- Integrated on-chip operational amplifiers (vs PIC16F1503-I/ST)
- Zero Cross Detect peripheral (vs PIC16F1503-I/ST)
- Peripheral Pin Select flexibility (vs PIC16F1455-I/ST)
Design Notes
Place a 0.1µF ceramic decoupling capacitor as close as possible to the VDD pin (pin 1) and a bulk capacitor (e.g., 1µF to 10µF) on the VDD rail. For low-power battery applications, the XLP technology enables nanoWatt sleep modes, but the regulator's quiescent current remains the dominant standby draw - choose a low-Iq LDO or use direct battery connection within the supply range. Estimated: with a CR2032 coin cell (3V, 220mAh) and XLP sleep current of ~50nA, theoretical battery life exceeds 15 years, but actual life is constrained by sensor/communications wake events and self-discharge of the cell.
The 14-TSSOP package has a 0.65mm pitch, which requires careful PCB layout to avoid solder bridges. Use a reflow profile compatible with JEDEC J-STD-020 MSL classification for the part, and ensure the ICSP programming footprint (RA0/RA1/RA3/MCLR/VDD/VSS) is accessible for in-circuit programming. For noisy environments, place a guard ring around the analog op-amp input pins and keep digital traces away from sensitive analog routing. Use a ground pour on the top layer to provide a low-impedance return path.
Do not leave MCLR floating; tie it to VDD through a 10kΩ resistor or directly if no reset is needed. The I/O pins are NOT 5V tolerant when VDD is below 3V - check the electrical characteristics section for the specific VOH/VIH thresholds at your operating voltage. When using the ADC, ensure the input signal source has sufficiently low impedance (<10kΩ) to avoid ADC sampling errors. The PPS peripheral must be configured before enabling the corresponding digital function, otherwise the pin will remain in its default state.
Compliance Information
RoHS and REACH compliant per Microchip product page and distributor listings. -I temperature grade indicates industrial -40C to +85C. Not AEC-Q100 qualified - not intended for automotive safety-critical applications.
