PIC16C662T-10/PQ - 8-Bit OTP MCU, 7KB, 10MHz, 44-MQFP | Microchip
MPN: PIC16C662T-10/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.1 | $131.00 |
| 100 | $11.75 | $1,175.00 |
| 500 | $10.4 | $5,200.00 |
| 1,000 | $9.2 | $9,200.00 |
PIC16C662T-10/PQ Overview
An 8-bit microcontroller (MCU) is a programmable computing engine that executes instructions on 8-bit data paths and serves as the embedded brain of consumer appliances, industrial controllers, and legacy automotive subsystems. MCUs sit below microprocessors in the silicon hierarchy and above discrete logic, integrating CPU core, non-volatile program memory, working RAM, and peripherals into a single die. The PIC16C family targets cost-sensitive applications where OTP programmability, deterministic instruction timing, and small footprint are valued over in-system re-programmability.
Key features of the PIC16C662T-10/PQ include 22 I/O pins with individually programmable direction, a 14-bit instruction word, a Harvard architecture with separate program and data buses, and a wide operating voltage range typical of the PIC16C series. The device is well-suited to applications that require moderate code density (4K words), low power consumption, and analog signal conditioning via on-chip comparators.
Typical applications include appliance control boards, industrial sensor interfaces, security and access-control panels, HVAC actuators, and legacy embedded products. Designers typically pair it with external EEPROM or serial ADC peripherals when non-volatile data storage or higher-resolution analog input is required.
When designing with the PIC16C662T-10/PQ, ensure the OTP window is masked if code security is required, and account for the 10 MHz oscillator ceiling when selecting crystal or resonator components. Because this is an OTP device, firmware verification must be performed on-window or on pre-programmed parts before final commit; consider a flash-based PIC16F equivalent if in-field firmware updates are required.
Drop-in alternatives for PIC16C662T-10/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 PIC16C662T-10/PQ (same form factor and footprint) — differing in Maximum Clock Frequency, Program Memory Size, Program Memory Type, ADC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C662-10/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C662-20/PQ
✅ Drop-In✓ In Stock
$9.75 / Unit
View Datasheet →PIC16C662-20E/PQ
✅ Drop-In✓ In Stock
$10.95 / Unit
View Datasheet →PIC16C662-20I/PQ
✅ Drop-In✓ In Stock
$5.74 / Unit
View Datasheet →PIC16C662T-04E/PT
✅ Drop-In✓ In Stock
$6.2 / Unit
View Datasheet →PIC16C662T-10/PQ Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC |
| Family | PIC16C |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 176 bytes |
| Data EEPROM | Not present (external required) |
| Maximum Clock Frequency | 10 MHz |
| I/O Pins | 22 |
| Analog Comparators | 2 |
| ADC | None (external required) |
| Brown-Out Detect (BOD) | Yes |
| Power-On Reset (POR) | Yes |
| Watchdog Timer (WDT) | Yes |
| Package Type | 44-MQFP (PQ) 10x10 mm |
| Mounting Type | Surface Mount |
| Lead Pitch | 0.80 mm |
| Architecture | Harvard (separate program/data buses) |
| Instruction Word Width | 14 bits |
PIC16C662T-10/PQ Pin Configuration
| Pin 1 | OSC1/CLKIN — Oscillator input or external clock input |
| Pin 2 | OSC2/CLKOUT — Oscillator output |
| Pin 3 | MCLR — Master clear (reset) input, active low |
| Pin 4 | RA0 — PORTA bit 0 (digital I/O) |
| Pin 5 | RA1 — PORTA bit 1 (digital I/O) |
| Pin 6 | RA2 — PORTA bit 2 (digital I/O) |
| Pin 7 | RA3 — PORTA bit 3 (digital I/O) |
| Pin 8 | RA4 — PORTA bit 4 (digital I/O / T0CKI) |
| Pin 9 | RA5 — PORTA bit 5 (digital I/O / SS) |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | RB0/INT — PORTB bit 0 (external interrupt) |
| Pin 13 | RB1 — PORTB bit 1 (digital I/O) |
| Pin 14 | RB2 — PORTB bit 2 (digital I/O) |
| Pin 15 | RB3 — PORTB bit 3 (digital I/O) |
| Pin 16 | RB4 — PORTB bit 4 (digital I/O) |
| Pin 17 | RB5 — PORTB bit 5 (digital I/O) |
| Pin 18 | RB6 — PORTB bit 6 (digital I/O / PGC) |
| Pin 19 | RB7 — PORTB bit 7 (digital I/O / PGD) |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | RC0 — PORTC bit 0 (digital I/O) |
| Pin 23 | RC1 — PORTC bit 1 (digital I/O) |
| Pin 24 | RC2 — PORTC bit 2 (digital I/O) |
| Pin 25 | RC3 — PORTC bit 3 (digital I/O / SCL) |
| Pin 26 | RC4 — PORTC bit 4 (digital I/O / SDA) |
| Pin 27 | RC5 — PORTC bit 5 (digital I/O / SDO) |
| Pin 28 | RC6 — PORTC bit 6 (digital I/O / TX) |
| Pin 29 | RC7 — PORTC bit 7 (digital I/O / RX) |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RE0/RD — PORTE bit 0 / read control |
| Pin 33 | RE1/WR — PORTE bit 1 / write control |
| Pin 34 | RE2/CS — PORTE bit 2 / chip select |
| Pin 35 | NC — Not connected |
| Pin 36 | NC — Not connected |
| Pin 37 | NC — Not connected |
| Pin 38 | NC — Not connected |
| Pin 39 | NC — Not connected |
| Pin 40 | NC — Not connected |
| Pin 41 | NC — Not connected |
| Pin 42 | NC — Not connected |
| Pin 43 | NC — Not connected |
| Pin 44 | NC — Not connected |
Typical Applications
PIC16C662T-10/PQ is suitable for 6 applications: Appliance Control Boards, Industrial Sensor Interface Panels, Security and Access-Control Panels, HVAC Actuator Controllers, Legacy Embedded Product Maintenance, Consumer Remote Controls and IR Transmitters.
Appliance Control Boards
The PIC16C662T-10/PQ's 7 KB OTP program memory, 22 I/O, and 10 MHz clock make it well suited for washing-machine, dishwasher, and microwave control boards. The Harvard architecture and deterministic 100 ns instruction cycle guarantee loop timing for relay sequencing, sensor polling, and LED indicator multiplexing. Two on-chip analog comparators handle zero-crossing detection for triac-driven heater and motor loads without an external ADC. Brown-Out Detect protects against low-voltage brown-outs common in appliance mains environments.
Recommended
Industrial Sensor Interface Panels
For industrial sensor-interface panels, the PIC16C662T-10/PQ provides 22 digital I/O lines for polling limit switches, encoders, and indicator lamps. Its OTP memory ensures firmware cannot be inadvertently modified by voltage transients on factory floors. The 176-byte RAM is sufficient for buffering sensor states and short command queues. The two analog comparators allow direct interface to thermistor-bridge and photocell circuits, eliminating external op-amps in cost-sensitive designs.
Recommended
Security and Access-Control Panels
The PIC16C662T-10/PQ serves as the main controller in security keypads, card-reader interfaces, and access-control panels where 7 KB of code handles PIN validation, relay actuation, and alarm-tone generation. Its OTP memory prevents reverse engineering of secure credential algorithms. Brown-Out Detect and Watchdog Timer provide the fail-safe behavior required in security-system listings. The 10 MHz clock easily meets debounce and timing-slack requirements for keypad scanning and tamper-switch monitoring.
Recommended
HVAC Actuator Controllers
In HVAC damper and valve actuator controllers, the PIC16C662T-10/PQ drives stepper or DC motor bridges via PWM derived from its on-chip timers, while polling temperature sensors through the two analog comparators. The 14-bit instruction width enables compact state-machine code for proportional-integral control loops. The 22 I/O lines support multi-zone damper arrays, and the Harvard architecture ensures deterministic loop timing even under interrupt load from the Watchdog Timer.
Recommended
Legacy Embedded Product Maintenance
The PIC16C662T-10/PQ remains in demand for sustaining legacy OEM products whose firmware was committed to OTP silicon years ago. Field replacements and warranty repairs require the exact same silicon to maintain functional and timing compatibility. The 44-MQFP footprint is widely supported by assembly lines still running these legacy boards. For existing designs, Microchip's NRND classification allows continued supply through authorized distribution, but new design-ins should migrate to the flash-based PIC16F877A-I/PQ.
Recommended
Consumer Remote Controls and IR Transmitters
The PIC16C662T-10/PQ is used in higher-end consumer remote controls that need more code space than typical 8-pin PIC MCUs can offer. Its 7 KB program memory holds multi-protocol IR transmission libraries (RC5, NEC, SIRC) plus custom button-mapping tables. The 10 MHz clock supports accurate 38 kHz carrier generation with minimal software overhead. OTP memory prevents cloning of proprietary IR protocols, an important feature for branded consumer-electronics OEMs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662T-10/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C662-10/PQ | PIC16C662-20/PQ | PIC16C662-20E/PQ | PIC16C662-20I/PQ | PIC16C662T-04E/PT |
|---|---|---|---|---|---|---|
| Package | MQFP-44 (PQ) 10x10 mm | MQFP-44 (PQ) 10x10 mm - same | MQFP-44 (PQ) 10x10 mm - same | MQFP-44 (PQ) 10x10 mm - same | MQFP-44 (PQ) 10x10 mm - same | TQFP-44 (TQ) - different package family but pin-compatible |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP (7 KB) | OTP (7 KB) - same | OTP (7 KB) - same | OTP (7 KB) - same | OTP (7 KB) - same | OTP (7 KB) - same |
| Maximum Clock Frequency | 10 MHz | 10 MHz - same | 20 MHz (+100%) | 20 MHz (+100%) | 20 MHz (+100%) | 4 MHz (-60%) |
| Operating Temperature Range | Commercial (0C to +70C) | Commercial - same | Commercial - same | Extended (-40C to +125C) | Industrial (-40C to +85C) | Extended (-40C to +125C) |
| Data RAM | 176 bytes | 176 bytes - same | 176 bytes - same | 176 bytes - same | 176 bytes - same | 176 bytes - same |
| I/O Pins | 22 | 22 - same | 22 - same | 22 - same | 22 - same | 22 - same |
| Analog Comparators | 2 | 2 - same | 2 - same | 2 - same | 2 - same | 2 - same |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Tape-and-reel packaging for high-volume SMD assembly (vs PIC16C662-10/PQ)
- 10 MHz speed grade optimized for moderate-cost OTP designs (vs PIC16C662-20/PQ)
- MQFP-44 (PQ) package provides lowest-profile SMT option (vs PIC16C662T-04E/PT)
Design Notes
Decouple the PIC16C662T-10/PQ VDD pins (11, 21, 31) with 100 nF ceramic capacitors placed within 5 mm of each pin. Add a single 10 uF tantalum or aluminum bulk capacitor at the board entry point to suppress motor and relay switching transients. The device has three VDD/VSS pairs internally bonded - failure to decouple each pair can cause code-fetch corruption under high dI/dt loads.
Route the MCLR reset line away from switching nodes and add a 10 kohm pull-up to VDD. Place the crystal or resonator within 10 mm of OSC1/OSC2 pins and guard the traces with a ground pour to minimize EMI coupling. The MQFP-44 lead pitch is 0.80 mm - use 0.40 mm wide traces and 0.20 mm clearance to maintain manufacturability at outsourced assembly houses.
Because PIC16C662T-10/PQ is OTP memory, any code bug committed to the silicon cannot be patched in the field - thorough verification on a PIC16C662 /JW (windowed) part or on a pin-compatible PIC16F877A-I/PQ emulator is mandatory before production commit. Brown-Out Detect voltage must be configured via configuration fuses lower than the minimum expected VDD; leaving BOD disabled in noisy environments can lead to corrupted program-counter state on brown-out events.
Compliance Information
RoHS, REACH, lead-free, and halogen-free status not explicitly stated in verified distributor data for this NRND OTP part. Conflict-minerals compliance follows Microchip's standard corporate declaration. Verify specific date-code compliance with the supplier before RoHS-only assembly.
