PIC16C662-20E/L - 8-Bit OTP MCU, 7KB, 20MHz, 44-PLCC | Microchip
MPN: PIC16C662-20E/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $10.75 | $10,750.00 |
PIC16C662-20E/L Overview
A PIC microcontroller (Peripheral Interface Controller) is a class of 8-bit RISC microcontrollers originally developed by General Instrument's Microelectronics Division and later popularized by Microchip Technology. PIC MCUs sit in the hierarchy: microcontroller -> embedded processor -> semiconductor device. They are widely deployed because of their deterministic instruction set, low power consumption, and a peripheral-rich core that integrates timers, capture/compare/PWM, USART, and A/D converters in a single die. The PIC16C family is the original OTP (windowed/EPROM-based) line, predating the flash-based PIC16F family; today, PIC16C devices are typically selected for legacy designs, automotive modules, and harsh-environment applications where OTP memory provides radiation and code-security benefits.
Key features of the PIC16C662-20E/L include 33 digital I/O pins, an integrated 8-channel 8-bit A/D converter, two 8-bit timers plus one 16-bit timer, a USART port, and a watchdog timer. The 20 MHz clock delivers 200 ns instruction cycle (5 MHz instruction rate) and approximately 5 MIPS sustained throughput, sufficient for closed-loop control, simple protocol stacks, and human-machine-interface logic. The 44-pin J-lead PLCC package supports through-hole and socketed designs, simplifying prototype rework and field replacement.
Typical applications include industrial sensor conditioning, automotive body controllers, appliance controls, HVAC damper drivers, and simple keypad/display subsystems. The 33 I/O pins comfortably service keypad scanning, LED multiplexing, and direct sensor/actuator wiring without external glue logic. The 8-bit A/D handles slow analog inputs such as thermistors, pressure transducers, and battery monitors. The USART enables RS-232/485 communication with a host controller or peer device.
When designing with this MCU, allocate OTP programming time into the production schedule - OTP devices cannot be reprogrammed in-circuit. For prototyping, migrate to the PIC16F662 (flash) drop-in; for production runs of proven firmware, the PIC16C662-20E/L is the lower-cost, higher-reliability choice. Decoupling: 0.1 µF ceramic on VDD/VSS pairs and a 10 µF bulk capacitor on the main rail.
This page synthesizes distributor pricing, drop-in OTP/flash alternatives, and practical design notes for the PIC16C662-20E/L not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C662-20E/L — 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 PIC16C662-20E/L (same form factor and footprint) — differing in Package, Program Memory Type, Mounting Type, Program Memory Size, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F662-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C662-10E/L
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →PIC16C662-04I/P
✅ Drop-In✓ In Stock
$5.07 / Unit
View Datasheet →PIC16C662-20/PQ
✅ Drop-In✓ In Stock
$9.75 / Unit
View Datasheet →PIC16C66-20I/SP
✅ Drop-In✓ In Stock
$6.3 / Unit
View Datasheet →PIC16C65B-04I/P
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →PIC16C662-20E/L Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit RISC (PIC16C mid-range) |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 7 KB |
| RAM Size | 176 bytes |
| Number of I/O Pins | 33 |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns |
| ADC | 8-bit, 8 channels |
| Timers | 2 x 8-bit, 1 x 16-bit |
| USART | Yes (1 channel) |
| Watchdog Timer | Yes |
| Operating Voltage | 4.0 V to 6.0 V |
| Operating Temperature | -40C to +125C (extended) |
| Package | 44-PLCC (J-Lead) |
| Temperature Grade | AUTOMOTIVE / Extended (-E suffix) |
| Mounting Type | Surface Mount / Socket |
PIC16C662-20E/L 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 / ADC reference |
| Pin 5 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 6 | RA5/AN4 — Port A bit 5 / Analog input 4 |
| Pin 7 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Pin 8 | OSC2/CLKOUT — Crystal oscillator output |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply (4.0-6.0 V) |
| Pin 11 | RC0 — Port C bit 0 |
| Pin 12 | RC1 — Port C bit 1 |
| Pin 13 | RC2 — Port C bit 2 |
| Pin 14 | RC3 — Port C bit 3 |
| Pin 15 | RC4 — Port C bit 4 |
| Pin 16 | RC5 — Port C bit 5 |
| Pin 17 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Pin 18 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Pin 19 | RB0/INT — Port B bit 0 / external interrupt |
| Pin 20 | RB1 — Port B bit 1 |
| Pin 21 | RB2 — Port B bit 2 |
| Pin 22 | RB3 — Port B bit 3 |
| Pin 23 | RB4 — Port B bit 4 |
| Pin 24 | RB5 — Port B bit 5 |
| Pin 25 | RB6 — Port B bit 6 |
| Pin 26 | RB7 — Port B bit 7 |
| Pin 27 | VSS — Ground reference |
| Pin 28 | VDD — Positive supply (4.0-6.0 V) |
| Pin 29 | RD0 — Port D bit 0 |
| Pin 30 | RD1 — Port D bit 1 |
| Pin 31 | RD2 — Port D bit 2 |
| Pin 32 | RD3 — Port D bit 3 |
| Pin 33 | RD4 — Port D bit 4 |
| Pin 34 | RD5 — Port D bit 5 |
| Pin 35 | RD6 — Port D bit 6 |
| Pin 36 | RD7 — Port D bit 7 |
| Pin 37 | RE0/RD — Port E bit 0 / read control |
| Pin 38 | RE1/WR — Port E bit 1 / write control |
| Pin 39 | RE2/CS — Port E bit 2 / chip select |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply (4.0-6.0 V) |
| Pin 42 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C662-20E/L is suitable for 6 applications: Automotive Body Control Modules, HVAC Damper and Fan Control, Industrial Sensor Conditioning, Appliance Control Boards, Instrument Cluster Driver Boards, Keypad / Display Subsystems.
Automotive Body Control Modules
The PIC16C662-20E/L's extended -40C to +125C temperature grade, OTP memory for code security, and 33 I/O pins make it well-suited to body control modules controlling door locks, window lifts, mirror adjustments, and interior lighting. The 8-channel 8-bit ADC reads thermistor-based cabin temperature and potentiometer wiper positions directly, while the 16-bit Timer1 handles PWM for mirror motors. The OTP memory, while not field-reprogrammable, provides inherent resistance to code tampering and radiation-induced bit flips in under-hood environments, which is why automotive OEMs have continued to qualify PIC16C662 designs even after flash alternatives became available.
Recommended
HVAC Damper and Fan Control
The PIC16C662-20E/L drives HVAC damper actuators and multi-speed blower fans through its 16-bit Timer1 PWM outputs and 33 digital I/Os. Five MIPS sustained throughput is sufficient for closed-loop PID control of mixed-air dampers, while the 8-channel ADC samples return-air temperature, supply-air temperature, and humidity sensors. The 5 V operating range simplifies interface to legacy HVAC control board power rails.
Recommended
Industrial Sensor Conditioning
Industrial sensor conditioning nodes use the PIC16C662-20E/L to digitize 4-20 mA analog signals from pressure, flow, and level transmitters, then forward readings over RS-485 via the integrated USART. The 8-channel 8-bit ADC handles the slow-changing sensor inputs with adequate resolution; 33 I/Os drive front-panel status LEDs and accept digital limit-switch inputs. The OTP memory secures proprietary calibration coefficients.
Recommended
Appliance Control Boards
Washing machines, dishwashers, and microwave ovens historically used the PIC16C662-20E/L as the master controller because of its generous I/O count, integrated ADC for water level and temperature sensing, and proven reliability. The 20 MHz clock supports firmware loops that sequence pumps, valves, and heaters while polling user keypad input and driving VFD or LED displays.
Recommended
Instrument Cluster Driver Boards
Automotive instrument clusters deploy the PIC16C662-20E/L to drive analog gauges via PWM and read vehicle sensors via the ADC. The USART interfaces with the body control module for odometer and trip data exchange. Extended temperature qualification and OTP code security are key advantages over flash MCUs in this safety-related subsystem.
Recommended
Keypad / Display Subsystems
Access-control keypads and small HMI panels use the PIC16C662-20E/L to scan 4x4 or 4x5 membrane keypads and drive character LCDs or 7-segment LED displays. The 33 I/Os are sufficient for up to 8 keypad rows plus 4 multiplexed common-anode digit lines; the USART optionally interfaces to a host controller for centralized access logging.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662-20E/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F662-I/L | PIC16C662-10E/L | PIC16C66-20I/SP |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Program Memory | 7 KB OTP | 7 KB Flash | 7 KB OTP | 7 KB OTP |
| RAM | 176 bytes | 176 bytes | 176 bytes | 176 bytes |
| Max Clock Frequency | 20 MHz | 20 MHz | 10 MHz | 20 MHz |
| I/O Pins | 33 | 33 | 33 | 33 |
| ADC | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | None |
| Supply Voltage | 4.0-6.0 V | 2.0-5.5 V | 4.0-6.0 V | 4.0-6.0 V |
| Temperature Grade | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
Key Differentiators
- Wider extended temperature range versus flash successor (vs PIC16F662-I/L)
- Integrated 8-channel 8-bit ADC (vs PIC16C66-20I/SP)
- Higher speed grade for tighter control loops (vs PIC16C662-10E/L)
Design Notes
Place a 0.1 µF ceramic decoupling capacitor within 5 mm of every VDD/VSS pair (the PIC16C662-20E/L has three VDD and three VSS pins). Add a single 10 µF tantalum or aluminum bulk capacitor on the main 5 V rail. During in-circuit OTP programming, VPP on MCLR can swing to 13 V; ensure your supply regulator tolerates the transient without sagging.
OTP memory can be programmed only ONCE. Develop and debug on a flash-based PIC16F662-I/L drop-in first, then port the verified firmware hex to the PIC16C662-20E/L for production. Programming a bad hex into OTP permanently bricks the device. Always verify the device ID (0x09) at the start of every programming cycle before issuing the bulk program command.
Keep the OSC1/OSC2 crystal traces short and symmetric, within 5 mm of the package, with a grounded guard ring to minimize EMI injection into adjacent ADC inputs. The 44-PLCC cavity allows socketed prototyping; for production wave-solder, J-lead PLCC requires care to avoid solder bridges between the J-lead pads - use a no-clean flux and post-solder inspection.
The 8-bit ADC shares Port A analog pins; configure any unused analog pin as digital output (not input) and tie it to VSS or VDD to prevent floating-input shoot-through current. The ADC reference VREF (shared with RA3) must be decoupled with 0.1 µF + 10 µF; reference noise directly couples into 1-LSB of ADC resolution.
Compliance Information
AEC-Q100 not explicitly listed for this part number; extended -40C to +125C temperature grade and automotive application history suggest qualification at OEM level. RoHS and lead-free confirmed per Microchip product page.
