PIC16C662-10/P - 8-bit OTP MCU, 7KB ROM, 33 I/O | Microchip
MPN: PIC16C662-10/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.4 | $8.40 |
| 10 | $7.55 | $75.50 |
| 100 | $6.72 | $672.00 |
| 500 | $5.95 | $2,975.00 |
| 1,000 | $5.3 | $5,300.00 |
PIC16C662-10/P Overview
What is a PIC16C6x microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, program memory, RAM, and peripherals. The PIC16C6x family belongs to the broader category of microcontrollers -> 8-bit MCUs -> CMOS RISC microcontrollers -> PIC microcontrollers -> embedded controllers -> semiconductors. OTP (One-Time Programmable) memory allows the firmware to be burned once during production, making these parts economical for mature, stable, high-volume products where reprogramming is not required.
Key features include 33 I/O pins, an integrated analog comparator, programmable code protection, a programmable watchdog timer, power-saving sleep mode, and wide operating voltage support of 4.5V to 5.5V. The commercial operating temperature range suits industrial and consumer applications, and the OTP-based architecture reduces unit cost compared to flash-based PIC16F equivalents.
Technically, the PIC16C662-10/P uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution except for program branches, which take two cycles. The device includes two 8-bit timers and one 16-bit timer/counter, a synchronous serial port (SSP) supporting SPI and I2C, and a USART for asynchronous serial communication, providing the connectivity needed for embedded peripheral interfacing.
Typical applications include industrial control, automotive subsystems, consumer appliances, security and access control panels, and remote sensor data acquisition nodes. The combination of OTP memory, ample I/O count, and integrated analog comparators makes the device well suited to appliance controllers, HVAC thermostat modules, and small motor drive interface boards.
When designing with this part, note that OTP memory requires firmware programming during PCB assembly, so the firmware revision must be locked before volume production. Engineers migrating to a flash-based PIC16F equivalent can reuse the same DIP-40 footprint and pinout but must validate peripheral compatibility and erase/write behavior.
This page synthesizes distributor stock, drop-in alternatives, application guidance, and design considerations not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C662-10/P — 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 PIC16C662-10/P (same form factor and footprint) — differing in Package, Program Memory Type, Operating Temperature, Mounting Type, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C662-04/P
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C662-04I/P
✅ Drop-In✓ In Stock
$5.07 / Unit
View Datasheet →PIC16C662-10/P Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit PIC RISC (Harvard) |
| Instruction Set | 35 single-word instructions |
| Instruction Cycle Time | 200 ns (at 20 MHz clock input) |
| Maximum Clock Frequency | 20 MHz input (10 MHz oscillator at -10 speed grade) |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM Size | 176 bytes |
| I/O Pins | 33 |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| Operating Temperature Range | 0C to +70C (commercial) |
| Package | 40-pin PDIP (Plastic DIP, 0.600 inch / 15.24 mm) |
| Mounting Type | Through-Hole (THT) |
| Timers | 2x 8-bit, 1x 16-bit Timer/Counter |
| Communication Peripherals | SSP (SPI / I2C), USART/SCI |
| Analog Peripherals | Analog comparator |
| Watchdog Timer | Yes (programmable) |
| Code Protection | Yes (programmable) |
| Power-Saving Mode | Sleep mode |
PIC16C662-10/P Pin Configuration
| Pin 1 | MCLR/VPP — Master clear (reset) input / programming voltage input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / voltage reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer 0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SSP slave select |
| Pin 8 | RE0/AN5 — PORTE bit 0 / analog input 5 |
| Pin 9 | RE1/AN6 — PORTE bit 1 / analog input 6 |
| Pin 10 | RE2/AN7 — PORTE bit 2 / analog input 7 |
| Pin 11 | VDD — Positive supply voltage (5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer 1 oscillator output / clock input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer 1 oscillator input / CCP2 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Pin 18 | RC3/SCK/SCL |
| Pin 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SSP data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SSP data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (5 V) |
| Pin 33 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3 — PORTB bit 3 |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC16C662-10/P is suitable for 6 applications: Industrial Control Panels, Consumer Appliance Controllers, HVAC Thermostat Modules, Security and Access Control Panels, Small Motor Drive Interface Boards, Remote Sensor Data Acquisition Nodes.
Industrial Control Panels
The PIC16C662-10/P is well suited to industrial control panel logic because its 33 I/O lines can directly drive relays, optocouplers, and indicator LEDs without external glue logic. With 7 KB of OTP program memory, designers can implement ladder-logic-style Boolean sequencing, button debouncing, and fault detection. The integrated analog comparator enables threshold monitoring of sensor signals (level, pressure, temperature via transducer). Operated at 5 V from a regulated rail, the device runs deterministically at 200 ns per instruction, ensuring scan-time accuracy even with worst-case I/O servicing. The -10 speed grade also ensures fast interrupt response in time-critical safety interlocks. OTP memory keeps the unit cost low for OEM volume production.
Recommended
Consumer Appliance Controllers
Consumer appliances such as washing machines, microwave ovens, and coffee makers benefit from the PIC16C662-10/P's 33 I/O pins, integrated analog comparator, and low-cost OTP memory. Designers can drive 7-segment displays, scan keypads, and switch triacs for heater or motor control using the same chip, reducing BOM cost. The 7 KB OTP program memory holds complete state-machine firmware, while 176 bytes of RAM is sufficient for sensor buffering and timing variables. The commercial 0C to +70C temperature range suits indoor appliance enclosures, and the 5 V supply aligns with standard appliance power supplies. Compared to flash PICs, OTP locks firmware against accidental erasure in the field and reduces per-unit cost.
Recommended
HVAC Thermostat Modules
HVAC thermostat applications use the PIC16C662-10/P to read temperature sensors through its analog comparator, scan front-panel buttons and rotary encoders through PORTA/PORTB, and drive TRIAC-controlled fan and compressor relays. The 200 ns instruction execution enables precise PWM or thermostat hysteresis control, while 7 KB of OTP holds the full temperature curve and scheduling algorithm. The 5 V operating voltage aligns with standard HVAC 24 VAC step-down rails after rectification, and the 33 I/O count supports multi-stage systems with humidity, fan speed, and mode-select inputs. OTP prevents firmware tampering and ensures long-term production consistency.
Recommended
Security and Access Control Panels
Access control panels benefit from the PIC16C662-10/P's integrated USART for keypad or card-reader interface, SSP (SPI/I2C) for external EEPROM storage of access codes, and ample 33 I/O lines for door strikes, alarm buzzers, LED indicators, and tamper switches. The 7 KB OTP program memory locks the security firmware against unauthorized read-back (with code protection enabled), preventing cloning. The analog comparator can monitor battery-backed supply voltage and trigger low-battery alerts. Operated at 5 V, the device pairs with standard 12 V/5 V access-control power supplies and provides deterministic scan times for alarm response.
Recommended
Small Motor Drive Interface Boards
Small DC motor and stepper driver interface boards use the PIC16C662-10/P to generate step/direction signals, monitor encoder feedback through the 16-bit timer, and run closed-loop PID control at 200 ns per instruction. The 33 I/O pins drive H-bridge enable lines, direction latches, and fault indicators, while the analog comparator monitors motor current via a shunt resistor and trips overcurrent protection. 7 KB OTP holds motion profiles and safety routines. The wide 4.5-5.5 V supply tolerates USB-powered bench setups and 5 V regulator rails in fielded motor assemblies, making this part a flexible motion-control MCU.
Recommended
Remote Sensor Data Acquisition Nodes
Remote sensor data acquisition nodes leverage the PIC16C662-10/P's USART for Modbus RTU or RS-485 communication, SSP for SPI sensor interfacing, and analog comparator for threshold alarms on remote transducer inputs. The 200 ns instruction cycle ensures fast scan rates even with multiple sensor channels, and 176 bytes of RAM buffers immediate readings. The 7 KB OTP memory holds calibration tables and protocol stacks. Sleep mode reduces quiescent current for battery-powered nodes, while the wide 4.5-5.5 V supply accommodates battery and regulated-bus power sources. OTP locks the calibration against field drift from inadvertent reprogramming.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662-10/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C662-04/P | PIC16C662-04I/P | PIC16C66-20/SP |
|---|---|---|---|---|
| Package | PDIP-40 | PDIP-40 (same) | PDIP-40 (same) | SPDIP-28 (different) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 8 KB OTP (PIC16C66 family) |
| Maximum Clock | 10 MHz (20 MHz input) | 4 MHz (4 MHz input) | 4 MHz (4 MHz input) | 20 MHz |
| I/O Pins | 33 | 33 | 33 | 22 |
| RAM | 176 bytes | 176 bytes | 176 bytes | 368 bytes |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C | -40C to +85C (industrial) | 0C to +70C |
| Memory Type | OTP (one-time programmable) | OTP | OTP | OTP |
| Pin Compatibility | 40-pin PDIP base | Drop-in same package | Drop-in same package | Different pin count (28-pin) |
Key Differentiators
- 10 MHz oscillator / 200 ns instruction cycle vs 4 MHz on -04 grade (vs PIC16C662-04/P)
- 33 I/O pins vs 22 on PIC16C66 (vs PIC16C66-20/SP)
- Integrated analog comparator with reference input (vs PIC16C66-20/SP (no analog comparator))
- OTP program memory locks firmware permanently (vs PIC16F662-I/P (flash equivalent))
Design Notes
The PIC16C662-10/P requires a regulated 4.5 V to 5.5 V supply. Use a low-dropout regulator such as MCP1700-3302E (with appropriate voltage divider) or a 7805 linear regulator to derive 5 V from 12 V or 24 V industrial rails. Add 100 nF ceramic decoupling close to VDD pins (11 and 32) and a 10 uF bulk capacitor at the regulator output. Estimated: at 20 MHz active, the device draws ~15 mA; sleep mode reduces this to < 1 uA.
OTP memory can be programmed only once - firmware revisions require a new chip, not a reflash. Validate firmware on a flash-based PIC16F662-I/P prototype before committing to OTP volume programming. Also note that the -10 speed grade limits oscillator input to 10 MHz maximum; supplying a 20 MHz oscillator will violate the speed grade and may cause timing errors in serial peripherals (USART/SSP).
Place the 40-pin PDIP socket on a 0.600 inch (15.24 mm) row spacing with through-hole pads sized for 0.6 mm drill bits. Decoupling caps (100 nF) on each VDD/VSS pair should be within 5 mm of the package pins. For ICSP programming via RB6/RB7, expose these pins to an in-circuit programming header with MCLR pulled up through 10 kohm and a 10 kohm pulldown on RB7 for high-voltage programming mode.
The USART and SSP pins are not 5 V tolerant when interfaced to 3.3 V peripherals. Use a level translator (such as TI TXS0108E or NXP PCA9306) for I2C/SPI connections to 3.3 V sensors. For RS-485 communication, pair the USART with a MAX485 transceiver and add 120 ohm termination at both ends of the bus. Keep serial traces short and routed over a continuous ground plane to minimize EMI.
Compliance Information
Per distributor listings and chipdig.com data, the PIC16C662-10/P is a legacy OTP device without explicit RoHS lead-free marking. REACH compliant per Microchip policy. Not AEC-Q100 qualified - choose a PIC16F or PIC18 automotive-grade part for automotive applications.
