PIC16C771T/SO - 8-Bit OTP MCU, 7KB, 12-bit ADC, SOIC-20
MPN: PIC16C771T/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.2 | $72.00 |
| 100 | $6.45 | $645.00 |
| 500 | $5.8 | $2,900.00 |
| 1,000 | $5.25 | $5,250.00 |
PIC16C771T/SO Overview
An 8-bit OTP microcontroller is a microprocessor that combines a CPU core, non-volatile One-Time-Programmable program memory, RAM, and peripherals on a single die. OTP devices are programmed once with a device programmer and retain their code indefinitely, which makes them economical for high-volume embedded products where firmware is stable and field re-programmability is not required. The PIC16C architecture sits within a broader hierarchy: microcontroller -> embedded controller -> integrated circuit -> semiconductor, and Microchip's PIC16C line remains one of the most widely deployed 8-bit cores in industrial control.
Key features of the PIC16C771 include 35 single-word instructions, an operating speed of 20 MHz, and 6 channels of 12-bit Analog-to-Digital (A/D) conversion that deliver higher measurement resolution than the typical 8-bit ADCs found on legacy PIC16C devices. The device retains the classic PIC16C peripheral set including timers, USART, capture/compare/PWM, and a small RAM/SRAM footprint suitable for tight real-time loops.
Architecturally, the PIC16C771 uses a Harvard-style RISC core with separate program and data buses, an accumulator-based ALU, and a peripheral set tuned for deterministic bit-manipulation and low-latency interrupt response. The 12-bit ADC allows direct interfacing with precision sensors, eliminating an external ADC chip and shrinking the bill of materials. The wide SOIC-20 package also exposes enough I/O for keypad, display, and serial communication interfaces in parallel.
Typical applications include industrial automation controllers, sensor signal conditioning with on-chip 12-bit ADC, motor-control PWM peripherals, and legacy product retrofits where PIC16C5X source code must be ported forward. The device is also commonly used as a single-chip replacement for older PIC16C7X designs that do not require in-system Flash programmability.
When designing with this OTP device, be aware that code is committed permanently after programming - any firmware bug discovered after production requires a mechanical part swap rather than a field re-flash. Plan for either factory programming only, or migrate to a pin-compatible PIC16F series Flash variant if field updates are anticipated. The PIC16C771 is recommended only when OTP cost advantages justify the loss of re-programmability.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, giving engineers a single source to evaluate the PIC16C771T/SO against modern equivalents.
Drop-in alternatives for PIC16C771T/SO — 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/SO (same form factor and footprint) — differing in ADC, Package, Program Memory Size, RAM Size, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C770T/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.18 / Unit
View Datasheet →PIC16C771-I/SO
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C771-E/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.58 / Unit
View Datasheet →PIC16C717T-I/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.6 / Unit
View Datasheet →PIC16C711-20I/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.95 / Unit
View Datasheet →PIC16C771T/SO Maximum Ratings & Electrical Characteristics
| Core | PIC 8-bit RISC |
| Instruction Set | 35 single-word instructions |
| Instruction Execution Time | 200 ns (at 20 MHz) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| Operating Frequency | 20 MHz |
| Supply Voltage | 5 V |
| ADC | 6 channels, 12-bit |
| Package | SOIC-20 (0.295", 7.50 mm width) |
| Mounting Type | Surface Mount |
| Family Compatibility | Upward compatible with PIC16C5X and PIC12CXXX |
| Architecture | Harvard, RISC |
| Packaging Form | Tape & Reel (T suffix) |
PIC16C771T/SO Pin Configuration
| Pin 1 | RA2/AN2 — Digital I/O / Analog input channel 2 |
| Pin 2 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC positive reference |
| Pin 3 | RA4/AN4 — Digital I/O / Analog input channel 4 |
| Pin 4 | RA5/AN5/SS — Digital I/O / Analog input 5 / SPI slave select |
| Pin 5 | Vss — Ground reference |
| Pin 6 | RB0/INT — Digital I/O / External interrupt input |
| Pin 7 | RB1 — Digital I/O |
| Pin 8 | RB2 — Digital I/O |
| Pin 9 | RB3/CCP1 — Digital I/O / Capture/Compare/PWM channel 1 |
| Pin 10 | RB4 — Digital I/O |
| Pin 11 | RB5 — Digital I/O |
| Pin 12 | RB6/TX/CK — Digital I/O / USART TX or clock |
| Pin 13 | RB7/RX/DT — Digital I/O / USART RX or data |
| Pin 14 | Vss — Ground reference |
| Pin 15 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Pin 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Pin 17 | RC2/CCP1 — Digital I/O / CCP1 alternate |
| Pin 18 | RC3 — Digital I/O |
| Pin 19 | RC4 — Digital I/O |
| Pin 20 | RC5 — Digital I/O |
Typical Applications
PIC16C771T/SO is suitable for 6 applications: Industrial Sensor Signal Conditioning, Legacy Motor Control PWM Drive, Smart Instrumentation and Metering, Automotive Body Electronics (Legacy), White Goods and Appliance Controllers, Educational and Development Platforms.
Industrial Sensor Signal Conditioning
The PIC16C771T/SO's 6-channel 12-bit ADC makes it a strong fit for industrial sensor signal conditioning boards that interface analog transducers (load cells, thermocouples, strain gauges) directly to a digital controller. At 5 V supply with 4.096 mV LSB resolution, the ADC quantizes sensor outputs with enough precision for closed-loop process control without an external ADC chip, reducing BOM cost. The 20 MHz core runs deterministic calibration routines and averaging filters in real time. Placed between the sensor bridge and the host PLC, the PIC16C771T/SO delivers 4x better measurement resolution than 8-bit predecessors like the PIC16C770. Engineers should add RC filtering on analog inputs and use the internal voltage reference for ratiometric measurements to maximize noise immunity on long sensor cables.
Recommended
Legacy Motor Control PWM Drive
The PIC16C771T/SO integrates CCP/PWM peripherals well-suited for low-cost brushed DC or stepper motor control in legacy industrial machines. At 20 MHz, the PWM module generates accurate duty cycles from 0% to 100% with 10-bit resolution, and the 12-bit ADC samples motor current for closed-loop torque limiting. The SOIC-20 footprint simplifies through-hole-to-SMT board retrofits, preserving the 35-instruction PIC16C core compatibility that lets engineers port older PIC16C5X assembly code directly. Designers benefit from the OTP cost advantage in high-volume appliance and industrial motor products where firmware is finalized. For field-updatable designs, migrate to PIC16F716-I/SO which adds Flash memory while keeping the SOIC-20 footprint.
Recommended
Smart Instrumentation and Metering
The PIC16C771T/SO is widely used in digital panel meters, weigh scales, and process indicators where its 12-bit ADC provides direct conversion of analog sensor signals without external signal conditioning. The 7 KB OTP program memory accommodates calibration tables, linearization routines, and display-driving code for character LCDs or 7-segment LEDs. With the SOIC-20 footprint and 5 V operation, the device fits standard meter enclosures and supports long-term production runs where OTP cost savings outweigh the lack of field re-programmability. The 12-bit ADC delivers 4096 discrete counts, which is sufficient for 0.1% full-scale metering accuracy when combined with proper front-end amplification. Designers should use ratiometric ADC measurements against the supply rail to cancel reference drift.
Recommended
Automotive Body Electronics (Legacy)
The PIC16C771T/SO has historically powered automotive body controllers including lighting modules, seat controllers, and HVAC blend-door actuators where its 12-bit ADC interfaces to position sensors and its 20 MHz core runs control loops in real time. The SOIC-20 surface-mount package is well-suited to the vibration and thermal environment of automotive PCBAs. The 5 V supply aligns with 12 V battery systems after regulation, and the OTP memory locks firmware permanently to prevent field tampering. Note: for new automotive designs Microchip's PIC16F18444 family is preferred for AEC-Q100 qualification and Flash re-programmability. The PIC16C771T/SO remains in use only in long-lifecycle vehicle platforms where re-validation costs of a MCU swap are prohibitive.
Recommended
White Goods and Appliance Controllers
Appliance controllers in washing machines, dishwashers, and microwave ovens use the PIC16C771T/SO for its OTP cost advantage in high-volume production. The 6-channel 12-bit ADC monitors water level, temperature, motor current, and door switches, while the CCP/PWM module drives triac-controlled AC loads and DC motors. The 20 MHz core delivers deterministic response to user inputs and safety interlocks, and the SOIC-20 footprint supports automated surface-mount assembly lines. The OTP memory locks the final firmware to prevent after-market modification, which is critical for safety-certified appliances. Designers should budget for EMI suppression on the analog inputs and use optoisolators on AC mains interfaces to meet IEC 60730 functional safety requirements.
Recommended
Educational and Development Platforms
The PIC16C771T/SO is used in university curricula and hobbyist development boards to teach embedded programming fundamentals because the PIC16C core has only 35 single-word instructions and a straightforward architecture that students can master quickly. The 12-bit ADC introduces learners to real-world analog interfacing concepts including sampling, quantization, and noise filtering. The SOIC-20 package is breadboard-compatible with DIP adapters, allowing easy prototyping. Because the part is OTP, students program devices with a PIC programmer and retain their code permanently, simulating production deployment. Instructors can demonstrate migration paths from OTP to Flash equivalents like the PIC16F716-I/SO, which occupies the same SOIC-20 footprint for direct comparison projects.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C771T/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C770T/SO | PIC16C771-I/SO | PIC16C771-E/SO | PIC16C717T-I/SO | PIC16C711-20I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-20 | SOIC-20 - same | SOIC-20 - same | SOIC-20 - same | SOIC-20 - same | SOIC-20 - same |
| Program Memory | 7 KB OTP | 4 KB OTP | 7 KB OTP | 7 KB OTP | 3.5 KB OTP | 1.75 KB OTP |
| ADC Resolution | 12-bit | 8-bit | 12-bit | 12-bit | 10-bit | 8-bit |
| ADC Channels | 6 | 6 | 6 | 6 | 6 | 4 |
| Operating Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Temperature Grade | Commercial | Commercial | Industrial | Extended | Industrial | Industrial |
| Memory Type | OTP | OTP | OTP | OTP | OTP | OTP |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- 12-bit ADC provides 16x higher resolution than PIC16C770 (vs PIC16C770T/SO)
- Larger 7 KB program memory supports complex firmware (vs PIC16C717T-I/SO)
- Same SOIC-20 footprint across all temperature grades (vs PIC16C771-I/SO)
Design Notes
Estimated migration impact: because the PIC16C771 is OTP, any firmware bug discovered after the parts are programmed forces a mechanical rework - the chip cannot be re-flashed in-circuit. Build a small engineering prototype run (10-50 units) with a Flash-equivalent PIC16F716-I/SO on the same SOIC-20 footprint before committing to high-volume OTP programming. Validate firmware thoroughly with code coverage tools and hardware-in-the-loop testing. Reserve a budget for reprogramming services if a bug escapes to production. The PIC16F716-I/SO provides a Flash-based safety net that lets field updates recover from late-stage bugs without board rework.
The PIC16C771T/SO operates from a single 5 V Vdd rail. Decouple Vdd to Vss with a 100 nF ceramic capacitor placed within 5 mm of the supply pins (pin 5 and pin 14), and add a bulk 10 uF tantalum or aluminum electrolytic at the board's power-entry point. If the analog inputs are sampling low-level sensor signals (mV range), use a separate low-noise analog supply rail filtered with a ferrite bead and a 10 uF + 100 nF local decoupling network to prevent digital switching noise from corrupting ADC readings. Brown-out detection should be enabled in the configuration bits to prevent code execution from corrupted memory during power-up/power-down transients.
Layout the SOIC-20 footprint with 1.27 mm pitch pads and a thermal relief pattern under the exposed lead frame if present. Route the analog traces (AN0-AN5) away from digital switching signals and clock traces to minimize crosstalk into the ADC; use a ground guard ring around sensitive analog inputs and place the analog ground return directly to the Vss pin rather than through a shared digital ground. Keep the crystal or resonator traces (OSC1/OSC2) short and surrounded by ground pour to reduce EMI. For 20 MHz operation, controlled-impedance traces may be required for long signal runs.
When sampling the 12-bit ADC at high rates (above 100 ksamples/s), add an RC low-pass filter (typically 1 kohm + 100 pF) on each analog input to limit input bandwidth and prevent aliasing of out-of-band noise into the converter. Acquire multiple samples and average to improve effective resolution by approximately 1 bit per 4x oversampling. Enable the ADC in the ADCON0 register with adequate acquisition time (typically 19.2 us at 20 MHz) before initiating conversion. Use the internal voltage reference for ratiometric measurements against Vdd to cancel reference drift over temperature.
Compliance Information
Obsolete Microchip PIC16C family part. Specific lot RoHS/REACH compliance is not confirmed in the verified web data; many legacy PIC16C OTP devices were assembled before widespread RoHS transition and may require exemption documentation. AEC-Q100 not qualified - use PIC16F18444 family for automotive.
