PIC16C65AT-10I/PQ - 8-bit PIC MCU, 7KB OTP, 10MHz, 44-QFP | Microchip
MPN: PIC16C65AT-10I/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.05 | $80.50 |
| 100 | $7.2 | $720.00 |
| 500 | $6.5 | $3,250.00 |
| 1,000 | $5.8 | $5,800.00 |
PIC16C65AT-10I/PQ Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and peripheral interfaces on one die. Within the broader taxonomy, the PIC16C65A belongs to the PIC16 family, which sits under the Microchip PIC architecture family, microcontrollers sub-category, integrated circuits category, and ultimately under the semiconductor device hierarchy. The 'A' suffix denotes an enhanced silicon revision of the original PIC16C65, adding peripheral and memory improvements while retaining the original instruction set for source compatibility.
Key features include 33 I/O pins, three 8-bit timer/counters (Timer0, Timer1, Timer2) and one 16-bit timer/counter pair, an 8-bit parallel slave port, two capture/compare/PWM modules, a synchronous serial port (SSP) supporting SPI and I2C, a USART with 9-bit address detect, an 8-channel 8-bit ADC, a watchdog timer with on-chip RC oscillator, brown-out reset, and an operating voltage range compatible with 5V systems. The industrial ('I') temperature grade extends operation from -40C to +85C.
Architecturally, the PIC16C65A uses a Harvard architecture with separated program and data buses, allowing instruction fetch and operand access in a single cycle. The 14-bit wide instruction word and RISC-like instruction set deliver deterministic throughput for real-time control loops. CMOS fabrication and fully-static design eliminate the minimum clock frequency requirement, enabling low-power sleep/idle modes.
Typical applications include industrial control panels, sensor signal conditioning front-ends, motor driver sequencers, automotive body electronics, consumer appliances, and any 5V embedded design requiring parallel I/O expansion. The 44-pin QFP footprint is well-suited to moderate-density PCBs where through-hole packages are impractical.
When designing with this part, ensure that the OTP program memory programming algorithm (high-voltage VPP sequence) is supported by your programmer, since OTP cannot be erased or rewritten after programming. Decoupling: place 0.1uF ceramic capacitors on every VDD/VSS pair, plus a bulk 10uF tantalum near the MCU.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, and is intended as a procurement and engineering decision aid.
Drop-in alternatives for PIC16C65AT-10I/PQ — 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 PIC16C65AT-10I/PQ (same form factor and footprint) — differing in Program Memory Size, Core Architecture, Package, Program Memory Type, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C65A-10I/PQ
✅ Drop-In✓ In Stock
$5.2 / Unit
View Datasheet →PIC16C65A-20I/PQ
✅ Drop-In✓ In Stock
$8.62 / Unit
View Datasheet →PIC16C65A-20E/PQ
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC16C65A-10/PQ
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →PIC16F877A-I/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C65AT-10I/PQ Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 (8-bit RISC) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 192 bytes |
| Instruction Word Width | 14 bits |
| Maximum Clock Frequency | 10 MHz input (5 MHz instruction rate) |
| Operating Voltage | 5 V nominal |
| Number of I/O Pins | 33 |
| Package Type | 44-pin MQFP (PQ) |
| Package Code | QFP, GULL WING |
| Temperature Grade | Industrial (-40C to +85C) |
| ADC | 8-channel, 8-bit |
| Timers | 3 x 8-bit + 1 x 16-bit (TMR1/TMR3 pair) |
| Serial Interfaces | USART, SSP (SPI/I2C) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Brown-out Reset | Yes |
| Parallel Slave Port | Yes (8-bit) |
PIC16C65AT-10I/PQ Pin Configuration
| Pin 1 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 2 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pin 3 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Pin 4 | RA3/AN3/VREF — Port A bit 3 / Analog input 3 / VREF |
| Pin 5 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 6 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SSP slave select |
| Pin 7 | OSC1/CLKIN — Oscillator input / external clock in |
| Pin 8 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 9 | MCLR/VPP — Reset input / programming voltage |
| Pin 10 | VSS — Ground |
| Pin 11 | VDD — Positive supply (+5V) |
| Pin 12 | RB0/INT — Port B bit 0 / External interrupt |
| Pin 13 | RB1 — Port B bit 1 |
| Pin 14 | RB2 — Port B bit 2 |
| Pin 15 | RB3/PGM — Port B bit 3 / Low-voltage programming |
| Pin 16 | RB4 — Port B bit 4 |
| Pin 17 | RB5 — Port B bit 5 |
| Pin 18 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 19 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 20 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator out / Timer1 clock |
| Pin 21 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator in / CCP2 |
| Pin 22 | RC2/CCP1 — Port C bit 2 / CCP1 |
| Pin 23 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 24 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 25 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 26 | RC6/TX/CK — Port C bit 6 / USART TX / USART clock |
| Pin 27 | RC7/RX/DT — Port C bit 7 / USART RX / USART data |
| Pin 28 | RE0/RD/AN5 — Port E bit 0 / Parallel read / Analog input 5 |
| Pin 29 | RE1/WR/AN6 — Port E bit 1 / Parallel write / Analog input 6 |
| Pin 30 | RE2/CS/AN7 — Port E bit 2 / Parallel chip select / Analog input 7 |
| Pin 31 | VDD — Positive supply (+5V) |
| Pin 32 | VSS — Ground |
| Pin 33 | RD0/PSP0 — Port D bit 0 / Parallel slave port bit 0 |
| Pin 34 | RD1/PSP1 — Port D bit 1 / Parallel slave port bit 1 |
| Pin 35 | RD2/PSP2 — Port D bit 2 / Parallel slave port bit 2 |
| Pin 36 | RD3/PSP3 — Port D bit 3 / Parallel slave port bit 3 |
| Pin 37 | RD4/PSP4 — Port D bit 4 / Parallel slave port bit 4 |
| Pin 38 | RD5/PSP5 — Port D bit 5 / Parallel slave port bit 5 |
| Pin 39 | RD6/PSP6 — Port D bit 6 / Parallel slave port bit 6 |
| Pin 40 | RD7/PSP7 — Port D bit 7 / Parallel slave port bit 7 |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C65AT-10I/PQ is suitable for 6 applications: Industrial Control Panels, Sensor Signal Conditioning Front-Ends, Motor Driver Sequencers, Automotive Body Electronics, Consumer Appliance Controllers, Embedded Control Training and Prototyping.
Industrial Control Panels
The PIC16C65AT-10I/PQ is well suited for industrial control panels thanks to its 33 I/O lines, 5 MIPS execution rate, and industrial -40C to +85C temperature grade. Its 33 digital I/Os comfortably drive matrix keypads, multiplexed 7-segment or 14-segment LED displays, optocoupler-isolated inputs, and relay/MOSFET outputs without external glue logic. The USART supports RS-232/RS-485 panel-to-PLC links, while the MSSP drives SPI/I2C sensor chains. The 7 KB OTP holds medium-complexity ladder-equivalent logic, while 192 bytes RAM suffice for state machines and message buffers. Brown-out reset and watchdog timer protect against brown-out and firmware lockup conditions common in electrically noisy factory floors. The 44-pin QFP footprint supports moderate-density 2- or 4-layer PCBs typical of panel designs.
Recommended
Sensor Signal Conditioning Front-Ends
The PIC16C65AT-10I/PQ's integrated 8-channel 8-bit ADC, 5 MIPS throughput, and 33 I/O pins make it a strong fit for sensor signal conditioning front-ends that aggregate multiple analog inputs and forward processed values over serial links. With 5 MIPS, the MCU can sample up to 8 analog channels sequentially, apply digital filtering, and output readings via USART or SPI within millisecond budgets typical of industrial process monitoring. The CCP modules generate PWM excitation for resistivebridge sensors, while the SSP port chains external precision ADCs or DACs when 8-bit resolution is insufficient. Brown-out reset and the watchdog timer improve MTBF in unattended sensor nodes. Industrial temperature grade suits outdoor or cabinet-mounted installations.
Recommended
Motor Driver Sequencers
The PIC16C65AT-10I/PQ is a natural fit as a motor driver sequencer: its two CCP modules generate complementary PWM for H-bridge gate drivers, while the 5 MIPS throughput closes current/torque control loops in real time. The 33 I/Os interface Hall sensors, encoders, end-stop switches, and enable lines without external muxing. Brown-out reset and the on-chip watchdog timer ensure safe shutdown on fault conditions; the USART or SSP feeds diagnostics to a host controller. The industrial -40C to +85C grade covers stepper or BLDC driver stages in factory automation, HVAC damper actuators, and small pump controllers.
Recommended
Automotive Body Electronics
Although the PIC16C65AT-10I/PQ is not AEC-Q100 qualified, its -40C to +85C industrial temperature range, robust 5V operation, and 33 I/Os suit legacy non-safety automotive body electronics such as lighting controllers, mirror adjusters, seat controllers, and accessory multiplexers. The MSSP SPI port drives LED driver chains; the USART talks to body control modules; the parallel slave port interfaces to larger automotive MCUs when acting as an I/O expander. Brown-out reset and watchdog timer are essential in the 12V automotive power environment with cranking transients. For new designs, prefer AEC-Q100-qualified PIC16F or dsPIC variants.
Recommended
Consumer Appliance Controllers
The PIC16C65AT-10I/PQ's 7 KB OTP, 33 I/Os, and 5 MIPS throughput suit mid-range consumer appliances like washing machine controllers, microwave user interfaces, dishwasher panels, and small kitchen appliances. The ADC reads temperature, water level, and humidity sensors; the PWM drives triac-gated AC loads or DC motor controls; the USART drives LED/LCD display modules. The industrial temperature grade covers the 0-70C operating envelope of indoor appliances with margin. The 44-pin QFP is a practical surface-mount option for high-volume assembly lines.
Recommended
Embedded Control Training and Prototyping
The PIC16C65AT-10I/PQ remains useful for embedded control training, university microcontroller courses, and legacy prototype replication where the instruction set and peripheral map must match an existing reference design. The well-documented PIC16 instruction set is taught in many curricula, and the 44-pin MQFP fits standard breakout boards. The 7 KB OTP enforces proper code-once, ship-many discipline, although educators increasingly prefer the flash-based PIC16F877A-I/PQ for iterative development. The USART and SSP ports enable standard lab exercises in serial communication, while the ADC and PWM modules support sensor and actuator labs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65AT-10I/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65A-10I/PQ | PIC16C65A-20I/PQ | PIC16C65A-20E/PQ | PIC16C65A-10/PQ | PIC16F877A-I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin MQFP (PQ) | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same |
| Core Architecture | PIC16 8-bit RISC | PIC16 8-bit RISC | PIC16 8-bit RISC | PIC16 8-bit RISC | PIC16 8-bit RISC | PIC16 8-bit RISC |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 14 KB Flash |
| Max Clock Frequency | 10 MHz (5 MIPS) | 10 MHz (5 MIPS) | 20 MHz (5 MIPS for -10 spec; 20 MHz = 5 MIPS? -10 = 5 MIPS, -20 = 5 MIPS; verify) | 20 MHz input | 10 MHz | 20 MHz (5 MIPS) |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 368 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Commercial 0C to +70C | Industrial -40C to +85C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Key Differentiators
- 44-pin MQFP package with 33 I/Os - high pin count in surface-mount QFP (vs PIC16C65A-10/PQ (commercial temperature grade))
- Same-pinout flash-based modern equivalent with 2x program memory (vs PIC16F877A-I/PQ (flash, 14 KB))
- 10 MHz input clock speed grade matched to industrial grade (vs PIC16C65A-20I/PQ (20 MHz input))
Design Notes
Power decoupling for the PIC16C65AT-10I/PQ must include a 0.1uF ceramic capacitor on every VDD/VSS pair (pins 11/10 and 31/32) placed within 3 mm of the respective pins, plus a bulk 10uF tantalum or aluminum electrolytic capacitor near the MCU. Brown-out reset must be enabled in the configuration word to ensure the MCU holds in reset below ~4V VDD and prevents code execution at marginal voltages. For battery or 12V automotive rails, add a 5V regulator (LM7805 or equivalent) with reverse-battery and load-dump protection.
Layout the 44-pin MQFP land pattern per IPC-7351 nominal-density guidelines, with 0.5 mm pitch gull-wing pads. Place the 4 MHz to 10 MHz crystal (or resonator) within 5 mm of pins 7 (OSC1) and 8 (OSC2), keep the oscillator ground return path short and isolated from digital switching traces, and add a 4.7k to 10k pull-up on MCLR/VPP (pin 9). Route analog inputs RA0-RA5 and RE0-RE2 away from digital switching signals and noisy I/O traces, and provide a small analog ground plane if the ADC is used.
Common pitfalls when designing with the PIC16C65AT-10I/PQ: (1) OTP program memory cannot be erased or rewritten - verify firmware with a windowed PIC16C65A (JW package) prototype first; (2) the analog inputs share pins with digital I/O - configure ADCON1 to disable digital input buffers on ADC pins to avoid input leakage; (3) the Parallel Slave Port (Port D) shares pins with regular digital I/O and must be enabled via the TRISE register; (4) ICSP programming requires the RB6/RB7 pins to remain in their default high-impedance mode during reset; (5) the device is obsolete - consider PIC16F877A-I/PQ for new designs to avoid supply-chain risk.
The PIC16C65AT-10I/PQ's Parallel Slave Port (Port D + RE0/RE1/RE2) can exchange 8-bit data with a host processor at the full instruction rate. To preserve signal integrity at 5 MHz+ transfer rates, route the 8-bit Port D bus as a matched-length group within 2 cm length difference, place a 100 ohm series resistor near the MCU on each Port D pin to damp reflections, and use a ground reference plane under the bus. For USART/RS-232 links, add an external MAX232 or similar level shifter - the MCU pins are 5V CMOS and cannot directly drive RS-232 levels.
Compliance Information
RoHS/REACH/lead-free status not confirmed in provided data - the PIC16C family predates many of these mandates. Device is not AEC-Q100 qualified - choose 'E' suffix variants for extended temperature grades. Compliance fields set to 'unknown' per Data Authenticity Rule 10 (no fabrication).
