PIC16C771T-I/SS - 8-Bit OTP MCU, 7KB, 12-bit ADC | Microchip
MPN: PIC16C771T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.86 | $48.60 |
| 100 | $4.31 | $431.00 |
| 500 | $3.84 | $1,920.00 |
| 1,000 | $3.46 | $3,460.00 |
PIC16C771T-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), data RAM, timers, and peripherals such as ADCs, UARTs, and I/O ports. The PIC16C architecture is a RISC design with only 35 single-word instructions, sitting within the broader taxonomy of 8-bit microcontrollers -> microcontrollers -> microcontrollers (ICs) -> integrated circuits -> semiconductors. PIC16C parts use One-Time Programmable (OTP) EPROM rather than Flash, which makes them suited for low-volume, mature, or cost-sensitive industrial designs rather than in-field reprogrammable applications.
Key features of the PIC16C771T-I/SS include six channels of 12-bit ADC resolution, three timers, a USART with addressable SPI/I2C support, 16 general-purpose digital I/O pins, an 8-bit watchdog timer, in-circuit serial programming (ICSP), and 200 ns instruction execution at 20 MHz. The device's 256-byte RAM is small but adequate for state-machine and PID-loop control, while its 7 KB OTP supports roughly 4,000 instruction words. The 20-SSOP package has a 5.30 mm body width with 0.65 mm pin pitch.
The PIC16C771 uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access in a single cycle. Its NanoWatt technology provides power-managed sleep modes with wake-up on interrupt, supporting battery-backed designs. The 12-bit ADC offers 12 single-ended input channels at the package level (6 channels of 12-bit ADC as per Microchip product page text, with shared S&H) and supports both single-ended and differential conversions for sensor signal conditioning.
Typical applications include industrial sensor interfaces, motor control loops, smart instrumentation, automotive body electronics, white goods control boards, and battery chargers. The combination of 12-bit ADC, PWM, and USART supports closed-loop control in systems such as HVAC thermostats, BLDC drivers, and process controllers where deterministic 8-bit execution is acceptable.
When designing with the PIC16C771T-I/SS, ensure VDD decoupling with a 100 nF ceramic close to the supply pin, and reserve an MCLR pull-up if ICSP is unused. Because OTP memory cannot be erased, designers must use the JW windowed package or a Flash-equivalent (PIC16F877A/PIC16F76 family) for prototyping.
This page synthesizes distributor pricing, drop-in alternatives, application examples, and design notes that go beyond the manufacturer datasheet's raw specifications, including same-family replacements and cross-brand PIC16C-Flash equivalents.
Drop-in alternatives for PIC16C771T-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 PIC16C771T-I/SS (same form factor and footprint) — differing in Package, Program Memory Size, ADC, Core Architecture, Data EEPROM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C771T/SS
✅ Drop-In✓ In Stock
$3.14 / Unit
View Datasheet →PIC16C771T-E/SS
✅ Drop-In✓ In Stock
$2.22 / Unit
View Datasheet →PIC16C717T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C770T-I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C771T-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C 8-bit RISC |
| Instruction Set Size | 35 single-word instructions |
| Instruction Execution Time | 200 ns at 20 MHz |
| Maximum Clock Frequency | 20 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 256 bytes |
| Data EEPROM | Not present (OTP family) |
| ADC | 12-bit, up to 6 input channels |
| Supply Voltage (VDD) | 2.5 V to 5.5 V |
| I/O Pins | 16 general-purpose |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Communication | AUSART (addressable USART), SPI, I2C |
| Watchdog Timer | Yes (software-enabled) |
| Operating Temperature | -40 C to +85 C (Industrial, I-grade) |
| Package | 20-SSOP (5.30 mm body, 0.65 mm pitch) |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| RoHS Status | Compliant (T-prefix denotes Pb-free tape & reel) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life at <30 C / 85% RH) |
PIC16C771T-I/SS Pin Configuration
| Pin 1 | RA2/AN2 — Port A bit 2 / Analog input channel 2 |
| Pin 2 | RA3/AN3/VREF+ — Port A bit 3 / Analog input channel 3 / ADC positive reference |
| Pin 3 | RA4/AN4 — Port A bit 4 / Analog input channel 4 |
| Pin 4 | RA5/AN5/SS — Port A bit 5 / Analog input channel 5 / SPI slave select |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RA0/AN0 — Port A bit 0 / Analog input channel 0 |
| Pin 7 | RA1/AN1 — Port A bit 1 / Analog input channel 1 |
| Pin 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 module |
| Pin 12 | RC2/CCP1 — Port C bit 2 / CCP1 (Capture/Compare/PWM) |
| Pin 13 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — Port C bit 6 / USART async transmit / USART sync clock |
| Pin 17 | RC7/RX/DT — Port C bit 7 / USART async receive / USART sync data |
| Pin 18 | MCLR/VPP — Master clear reset (active low) / programming voltage input |
| Pin 19 | VDD — Positive supply voltage (2.5 V to 5.5 V) |
| Pin 20 | RB0/INT — Port B bit 0 / External interrupt input |
Typical Applications
PIC16C771T-I/SS is suitable for 6 applications: Industrial Sensor Interface Board, BLDC Motor Speed Controller, HVAC Thermostat Controller, Battery Charger Control Board, White Goods Control Board (Washing Machine / Dishwasher), Smart Instrumentation / Data Logger.
Industrial Sensor Interface Board
The PIC16C771T-I/SS suits industrial sensor interfaces because its 12-bit ADC with 6 channels digitizes thermocouple, strain-gauge, and 4-20 mA signals with 1 mV resolution at 5 V reference. Its 256-byte RAM holds scaled calibration coefficients, while the 7 KB OTP stores fixed linearization tables. USART/SPI/I2C peripherals stream digitized data to a host PLC. Compared to 10-bit ADC MCUs, the 12-bit converter quadruples raw resolution, reducing downstream averaging and improving signal-to-noise ratio. The 20-SSOP package supports compact DIN-rail modules, and the industrial -40 to +85 C temperature range meets IEC 60068 environmental stress requirements for factory-floor deployment.
Recommended
BLDC Motor Speed Controller
The PIC16C771T-I/SS fits closed-loop BLDC motor control because its three timers generate complementary PWM channels with adjustable dead-time, while the 12-bit ADC samples back-EMF or current-sense amplifiers at up to 50 ksps. The 35-instruction RISC core executes PID calculations within the 50 us PWM period, and the 256-byte RAM keeps state-machine and ramp variables in real time. Unlike DSP-based controllers, the 8-bit PIC16C is deterministic with fixed 200 ns instruction time at 20 MHz, simplifying code certification for safety-critical drives. The OTP memory is acceptable because motor-control firmware is finalized before production.
Recommended
HVAC Thermostat Controller
The PIC16C771T-I/SS powers HVAC thermostats by combining its 12-bit ADC for thermistor temperature sensing with PWM outputs for triac-driven fan/valve control. The 256-byte RAM retains setpoint and hysteresis variables across mains-brownout events, and NanoWatt sleep modes drop quiescent current below 1 uA when the HVAC system idles. The 7 KB OTP easily fits state-machine control loops with LCD-driver hooks. Compared to mechanical thermostats, the PIC16C771 enables programmable scheduling and remote sensor inputs while remaining cost-effective at OTP price points. The 20-SSOP package fits slim wall-mount enclosures.
Recommended
Battery Charger Control Board
The PIC16C771T-I/SS is well-suited for lead-acid or Li-ion charger control: its 12-bit ADC monitors pack voltage and charge current with 0.1% accuracy, while its PWM timer regulates a buck converter or linear pass element. The 256-byte RAM stores charge-state-machine variables (CC, CV, float phases), and the 7 KB OTP holds lookup tables for temperature-compensated voltage setpoints. Compared to dedicated charger ICs, the PIC16C771 allows custom charge algorithms without a firmware license. The industrial temperature grade supports under-hood automotive and outdoor solar installations.
Recommended
White Goods Control Board (Washing Machine / Dishwasher)
The PIC16C771T-I/SS is widely used in white-goods main control boards where its 16 I/O pins drive relay banks, triac controls, valve solenoids, and buzzer/LED indicators. Its three timers generate the precise pulse trains needed for universal-motor speed control, while its 12-bit ADC reads water-level and turbidity sensors. The 7 KB OTP is ideal because white-goods firmware is locked at production. Compared to 8-bit AVR or 8051 alternatives, the PIC16C771's deterministic instruction cycle simplifies EMI-conscious firmware timing and supports the long product lifecycles typical of appliance manufacturing.
Recommended
Smart Instrumentation / Data Logger
The PIC16C771T-I/SS suits portable data loggers because its 12-bit ADC captures sensor data with sufficient dynamic range for environmental monitoring, while its USART streams logs to an external EEPROM or SD card. The 256-byte RAM acts as a circular buffer, with periodic flushes to non-volatile storage. NanoWatt sleep modes enable multi-year battery life on a single lithium cell. Compared to Flash-based MCUs, the PIC16C771's OTP memory is cheaper per unit, important for high-volume disposable loggers. The 20-SSOP footprint supports miniaturized PCB layouts found in handheld instruments.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C771T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C771T/SS | PIC16C771T-E/SS | PIC16C717T-I/SS | PIC16C770T-I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) |
| Program Memory | 7 KB OTP (4K x 14) | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Data RAM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 10-bit | 10-bit |
| ADC Channels | 6 | 6 | 6 | 6 | 6 |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Temperature Range | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| I/O Pins | 16 | 16 | 16 | 16 | 16 |
Key Differentiators
- 12-bit ADC vs typical 10-bit ADC in this MCU class (vs PIC16C717T-I/SS)
- Industrial temperature range availability (vs PIC16C771T/SS)
- OTP-based architecture for production stability (vs PIC16F76-I/SS (Flash equivalent))
Design Notes
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 19) and a bulk 10 uF tantalum or aluminum cap on the same rail. For battery-backed designs, switch to NanoWatt sleep mode and wake on interrupt - the PIC16C771's sleep current is well below 1 uA at 3 V. Estimated: total quiescent draw including leakage paths typically 0.5-1.5 uA in sleep, depending on I/O pin configuration.
Because the PIC16C771 uses One-Time Programmable EPROM (not Flash), any code bug becomes permanent after programming. Always prototype with the JW windowed package (PIC16C771-I/JW) or a Flash-based equivalent (PIC16F76-I/SS) before committing to OTP production. Verified bugs in OTP cost full mask/programming charges, not just EPROM erases.
Route the analog inputs (AN0-AN5) away from digital switching traces and the oscillator network to minimize ADC crosstalk. Place the VREF+ bypass capacitor (typically 100 nF) directly on the RA3/VREF+ pin (pin 2) when using external reference. Keep clock traces short and surround OSC1/OSC2 with a ground guard ring if the application is EMI-sensitive.
The 12-bit ADC achieves best linearity when source impedance stays below 10 kohm - add a buffer op-amp (e.g., MCP6002) if the sensor exceeds this. Acquisition time is determined by the TACQ register, set per the ADC specification in the datasheet. Estimated: at 20 MHz ADC clock and 5 V VDD, a 4 us TACQ is sufficient for 5 kohm source impedance.
Compliance Information
The T-suffix in PIC16C771T-I/SS denotes Pb-free tape-and-reel packaging per Microchip ordering designation. RoHS and REACH compliance verified through Microchip product documentation. AEC-Q100 qualification is not present (this is a PIC16C industrial/consumer part, not an automotive-grade Q-qualified variant).
