PIC16C662-20I/P - 7KB OTP 8-bit MCU, 33 I/O, DIP-40 | Microchip
MPN: PIC16C662-20I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.2 | $8.20 |
| 10 | $7.45 | $74.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
PIC16C662-20I/P Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, I/O peripherals, and often analog or communication blocks. The PIC16C family represents Microchip's mid-range 8-bit architecture, sitting between the baseline PIC10/12/16 series and higher-pin-count PIC17/18 devices. Within the broader taxonomy, MCUs form a category of microprocessors -> semiconductors -> integrated circuits. The OTP (One-Time Programmable) EPROM program memory offers lower unit cost than windowed or flash parts in mature production runs, at the trade-off of not being erasable.
Key features include 33 bidirectional I/O lines, 8-bit data width, internal oscillator support options, two 8-bit timers and one 16-bit timer, a synchronous serial port (SSP) for SPI/I2C, a parallel slave port, two analog comparators, and a programmable watchdog timer. The Harvard architecture separates program (14-bit instruction width) and data (8-bit) buses, allowing instruction fetch and operand access in the same cycle.
Typical applications include industrial process controllers, appliance control boards, automotive body and HVAC modules, sensor signal conditioning, motor control, and embedded operator interfaces. Its high I/O count (33) and integrated analog comparators also suit battery management and power-conversion supervisory tasks in legacy designs.
When designing with this part, note that OTP memory requires device programming before PCB soldering for production runs; consider the flash-based PIC16F877A or PIC16F887 as reprogrammable substitutes on the same 40-pin PDIP footprint if field updates are needed.
This page synthesizes distributor pricing tiers, drop-in same-family alternatives, and practical design notes that go beyond the manufacturer datasheet.
Drop-in alternatives for PIC16C662-20I/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 PIC16C662-20I/P (same form factor and footprint) — differing in Package, Mounting Type, RoHS Status, Timers, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F877A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F887-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C662-04I/P
✅ Drop-In✓ In Stock
$5.07 / Unit
View Datasheet →PIC16C662-10/P
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16C65B-20I/P
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →PIC16C64A-20I/P
✅ Drop-In✓ In Stock
$6.65 / Unit
View Datasheet →PIC16C662-20I/P Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit RISC (PIC16C mid-range) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB |
| Instruction Word Width | 14-bit |
| RAM | 176 bytes |
| I/O Pins | 33 |
| Clock Speed (max) | 20 MHz |
| Instruction Cycle | 200 ns |
| Instruction Set Size | 35 instructions |
| Supply Voltage | 4.5 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 40-pin PDIP (DIP-40, 0.600") |
| Mounting Type | Through-Hole |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Analog Comparators | 2 |
| Serial Interface | SSP (SPI/I2C) |
| Watchdog Timer | Yes |
PIC16C662-20I/P Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| 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 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SSP slave select |
| Pin 8 | RE0/RD — PORTE bit 0 / parallel slave port read |
| Pin 9 | RE1/WR — PORTE bit 1 / parallel slave port write |
| Pin 10 | RE2/CS — PORTE bit 2 / parallel slave port chip select |
| Pin 11 | VDD — Positive supply voltage 5V |
| Pin 12 | VSS — Ground |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock |
| Pin 14 | OSC2/CLKOUT — Oscillator output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock in |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SSP clock |
| 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 |
| Pin 24 | RC5/SDO — PORTC bit 5 / SSP data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART TX |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART RX |
| 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 |
| Pin 32 | VDD — Positive supply voltage 5V |
| Pin 33 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3/PGM — PORTB bit 3 / LVP programming |
| 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
PIC16C662-20I/P is suitable for 6 applications: Industrial Process Controller, Appliance Control Board (Washer / Oven / HVAC), Sensor Signal Conditioning Hub, Battery Management Supervisory Node, Operator Interface / HMI Panel, Educational / Legacy Embedded Trainer.
Industrial Process Controller
The PIC16C662-20I/P fits industrial process controllers with 33 I/O pins to read limit switches, drive relay coils, and interface with 4-20 mA loops via the two on-chip analog comparators. Operating at 20 MHz (200 ns instruction cycle), it samples inputs fast enough for PID loops with millisecond update rates while the industrial -40C to +85C temperature grade tolerates factory-floor environments. Place the MCU near optocouplers and TVS arrays; route the SSP (SPI/I2C) lines to local EEPROM for parameter storage. Compared with a 16-bit MCU it offers lower BOM cost and simpler toolchain.
Recommended
Appliance Control Board (Washer / Oven / HVAC)
The PIC16C662-20I/P is well-suited to white-goods control boards where its 33 I/O lines drive keypads, 7-segment displays, triac-fired heater elements, and door-lock solenoids. The 4.5-5.5V supply range aligns with rectified 5V rails, and OTP memory locks firmware against field tampering - reducing warranty cost in high-volume appliance production. Three timers (2x 8-bit, 1x 16-bit) generate the PWM and time-base interrupts for closed-loop temperature control. The SSP supports EEPROM and RTC chips via I2C for schedule storage.
Recommended
Sensor Signal Conditioning Hub
The PIC16C662-20I/P's two on-chip analog comparators make it a practical front-end for sensor conditioning - thresholding thermocouple, NTC, or Hall-effect signals before digital readouts. With 20 MHz clock and 200 ns instruction cycle, the MCU executes averaging and linearization routines on multiple sensor channels in real time, while the SSP streams results over SPI to a host controller or display. Industrial temperature range ensures reliable operation in field-deployed sensor nodes. The 40-pin PDIP package suits hand-soldered prototype installations.
Recommended
Battery Management Supervisory Node
In battery management systems the PIC16C662-20I/P acts as a low-cost supervisory MCU monitoring cell voltages via analog comparators and toggling balancing MOSFETs through its 33 I/O pins. Operating from a 5V rail derived from the battery stack, the part draws microamp-level sleep currents when idle, preserving pack energy. The 35-instruction RISC core is well-documented in legacy designs, simplifying safety certification for industrial UPS and e-bike battery packs. Note that OTP memory complicates late-stage firmware fixes - design accordingly.
Recommended
Operator Interface / HMI Panel
The PIC16C662-20I/P drives small operator interface panels - keypad scanning, LCD driving via parallel port, and LED status indication. With 33 I/O lines the MCU handles a 4x4 matrix keypad, a 16x2 character LCD, eight status LEDs, and a beeper without external I/O expanders. The 200 ns instruction cycle scans keypads faster than human perception (<10 ms response), while the SSP interfaces to a remote PLC for status updates. Through-hole PDIP simplifies hand assembly for low-volume HMI units.
Recommended
Educational / Legacy Embedded Trainer
The PIC16C662-20I/P serves educational labs teaching PIC assembly and C programming on a 40-pin PDIP breadboard-friendly footprint. With only 35 instructions and abundant I/O, students learn timers, interrupts, and serial protocols hands-on. The 20 MHz speed is forgiving for educational timing experiments, and the OTP memory caveat introduces real-world design considerations around firmware versioning. The PIC16F877A-I/P is the recommended upgrade for classroom kits requiring flash reprogramming.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662-20I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F877A-I/P | PIC16F887-I/P | PIC16C662-04I/P | PIC16C662-10/P | PIC16C65B-20I/P |
|---|---|---|---|---|---|---|
| Package | 40-pin PDIP (DIP-40) | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP EPROM (7 KB) | Flash (14 KB) | Flash (14 KB) | OTP EPROM (7 KB) | OTP EPROM (7 KB) | OTP EPROM (7 KB) |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 4 MHz (-80%) | 10 MHz (-50%) | 20 MHz |
| I/O Pins | 33 | 33 | 36 | 33 | 33 | 33 |
| ADC | None (comparators only) | 8-ch 10-bit | 14-ch 10-bit | None (comparators only) | None (comparators only) | None (comparators only) |
| Supply Voltage | 4.5V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| Approx. Qty-1 Price | $8.20 | $7.50 (active, lower) | $6.80 (active, lower) | $7.90 | $7.60 | $8.40 |
Key Differentiators
- Flash memory for in-field firmware updates vs OTP lock (vs PIC16F877A-I/P)
- Integrated 10-bit ADC vs analog comparators only (vs PIC16F887-I/P)
- Lower cost per unit in mature production (vs PIC16C662-04I/P)
- Wide supply voltage compatibility for modern designs (vs PIC16C662-10/P)
Design Notes
Place a 0.1 uF decoupling capacitor within 5 mm of each VDD pin (11 and 32) and a single 10 uF bulk capacitor near the MCU supply input. The PIC16C662-20I/P has two VDD/VSS pairs on opposite sides of the package - both must be connected. A 100 nF capacitor on MCLR (pin 1) improves reset noise immunity; pull MCLR high through a 10 kohm resistor to VDD.
The OTP (One-Time Programmable) program memory cannot be erased - any firmware bug becomes a permanent defect in production. Burn a windowed or flash-based PIC16F equivalent during prototyping and qualification, then lock down the OTP PIC16C662 only after firmware is fully validated. Use Microchip's ICD or REAL ICE for in-circuit debugging of the flash equivalent before committing to OTP.
The 20 MHz oscillator input (OSC1, pin 13) is sensitive to capacitive loading - keep the crystal or resonator within 10 mm of the MCU and route the traces over a continuous ground plane. For EMI-sensitive applications, add a series 10-33 pF trimmer on OSC2 to pull the frequency precisely to 20 MHz. The HS oscillator mode requires a 1 kohm feedback resistor across OSC1/OSC2 for stable operation.
Estimated: At 20 MHz clock and 5V supply with all 33 I/O pins toggling, the PIC16C662-20I/P draws approximately 20 mA active (per datasheet typical curves) - resulting in 100 mW dissipation. The 40-pin PDIP has a theta_JA of approximately 50 C/W, yielding a 5C junction rise above ambient. No heatsink is required, but ensure ambient airflow is adequate in enclosed industrial enclosures.
Brown-out reset is not enabled by default on the PIC16C662 - configure the BOREN bit in the configuration word to enable it for industrial environments where 5V rails may dip during motor inrush. The 4.5V minimum supply spec is tight; add a 100 uF bulk capacitor if the design shares the 5V rail with high-current loads. The on-chip watchdog timer (WDT) should be enabled for unattended industrial controllers.
Compliance Information
RoHS and REACH compliant per Microchip product declaration. Not AEC-Q100 qualified - not suitable for automotive safety-critical applications. Lead-free and halogen-free packaging per Microchip environmental compliance data.
