PIC16C662-04/P - 8-Bit CMOS OTP MCU, 7KB, 33 I/O | Microchip
MPN: PIC16C662-04/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.21 | $3.21 |
| 10 | $2.89 | $28.90 |
| 100 | $2.54 | $254.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.94 | $1,940.00 |
PIC16C662-04/P Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and programmable I/O peripherals on one die. The PIC architecture, originally derived from General Instrument's PIC1640, uses a Harvard design with separate program and data buses, a RISC instruction set, and a hardware stack. PIC16C microcontrollers in the mid-1990s were widely used in embedded control applications such as appliance controllers, automotive subsystems, and industrial instrumentation. Within the broader taxonomy, PIC16C662 belongs to the PIC16C6x family — a sub-family of Microchip's PICmicro MCU lineup, which itself sits within the category of 8-bit microcontrollers, MCUs, embedded processors, and finally semiconductors.
Key features include 33 digital I/O pins, two analog comparators, programmable code protection, and a watchdog timer with on-chip RC oscillator. The CMOS process delivers low power consumption suitable for both commercial and industrial embedded designs. The '04' speed suffix denotes the 4MHz maximum clock, while the '/P' suffix denotes a 40-pin PDIP (Plastic DIP) through-hole package.
The PIC16C662 implements Microchip's enhanced mid-range core, providing 35 single-word instructions, an 8-level hardware stack, and a 14-bit instruction word. The OTP program memory is one-time programmable, meaning each blank device can be written exactly once — a cost-effective approach for low- and medium-volume production runs where flash reprogrammability is not required.
Typical applications include appliance control (washing machines, microwave ovens), automotive body electronics (instrument clusters, lighting controllers), industrial motor control, security alarm panels, and general-purpose embedded logic replacement. The PIC16C662's analog comparators also make it suitable for sensor interface circuits in HVAC and process control.
When designing with this device, note that OTP memory cannot be erased; engineers should verify code thoroughly using an erasable windowed version (e.g., PIC16CR662) or a flash-based pin-compatible equivalent (e.g., PIC16F877A) during development before committing to production. A 40-pin PDIP footprint simplifies prototype breadboarding and rework in through-hole designs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers evaluate sourcing risk and second-source options for legacy designs.
Drop-in alternatives for PIC16C662-04/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 PIC16C662-04/P (same form factor and footprint) — differing in Instruction Cycle Time, Program Memory Size, Program Memory Type, Package, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C662-04I/P
✅ Drop-In✓ In Stock
$5.07 / Unit
View Datasheet →PIC16C662-10/P
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16F877A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F74-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F887-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C64A-04/P
✅ Drop-In✓ In Stock
$8.05 / Unit
View Datasheet →PIC16C662-04/P Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Family | PIC16C6x (PIC PIC® 16C) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM Size | 176 bytes |
| CPU Core | PIC16C enhanced mid-range (RISC) |
| Instruction Set Size | 35 single-word instructions |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Supply Voltage (Vdd) | 4.5 V to 5.5 V |
| I/O Pins | 33 |
| Analog Comparators | 2 |
| Hardware Stack Levels | 8 |
| Package Type | PDIP-40 (Plastic DIP, 40-pin) |
| Mounting Type | Through-Hole |
| Operating Temperature Range | 0C to +70C (Commercial) |
| Pin Count | 40 |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Code Protection | Programmable |
PIC16C662-04/P Pin Configuration
| Pin 1 | /MCLR — Master Clear (reset) input, active low |
| 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 / VREF |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Pin 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM/capture/compare) |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PORTC bit 6 / UART TX / USART clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / UART RX / USART data |
| Pin 18 | VSS — Ground |
| Pin 19 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 20 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 21 | RB1 — PORTB bit 1 |
| Pin 22 | RB2 — PORTB bit 2 |
| Pin 23 | RB3/PGM — PORTB bit 3 / low-voltage programming |
| Pin 24 | RB4 — PORTB bit 4 |
| Pin 25 | RB5 — PORTB bit 5 |
| Pin 26 | RB6/PGC — PORTB bit 6 / ICD clock |
| Pin 27 | RB7/PGD — PORTB bit 7 / ICD data |
| Pin 28 | RD0 — PORTD bit 0 |
| Pin 29 | RD1 — PORTD bit 1 |
| Pin 30 | RD2 — PORTD bit 2 |
| Pin 31 | RD3 — PORTD bit 3 |
| Pin 32 | VSS — Ground |
| Pin 33 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 34 | RD4 — PORTD bit 4 |
| Pin 35 | RD5 — PORTD bit 5 |
| Pin 36 | RD6 — PORTD bit 6 |
| Pin 37 | RD7 — PORTD bit 7 |
| Pin 38 | RE0/RD — PORTE bit 0 / read control (parallel slave port) |
| Pin 39 | RE1/WR — PORTE bit 1 / write control (parallel slave port) |
| Pin 40 | RE2/CS — PORTE bit 2 / chip select (parallel slave port) |
Typical Applications
PIC16C662-04/P is suitable for 6 applications: Appliance Control (Washing Machines, Microwave Ovens), Automotive Body Electronics (Instrument Clusters, Lighting), Security Alarm Panels, Industrial Motor Control (Small BLDC, Stepper Drivers), HVAC Sensor Interface Boards, General-Purpose Embedded Logic Replacement.
Appliance Control (Washing Machines, Microwave Ovens)
The PIC16C662-04/P fits appliance control because its 33 I/O pins can drive 7-segment displays, relay coils, keypads, and sensor inputs without external mux ICs, while the 4 MHz clock and 7 KB of OTP memory handle state-machine control loops for wash cycles or microwave timing. The two on-chip analog comparators directly interface with line-voltage zero-cross detectors and thermistor bridges. Compared with newer flash MCUs, the OTP-only architecture is a security advantage in appliances where unauthorized firmware cloning is a concern. Power dissipation stays well under 100 mW at 5V/4 MHz, simplifying thermal design inside sealed appliance enclosures.
Recommended
Automotive Body Electronics (Instrument Clusters, Lighting)
The PIC16C662-04/P suits automotive body modules because its 33 I/O lines can directly sink automotive lamp relays (typically 100-300 mA per pin via external drivers), while the 4 MHz instruction rate is adequate for turn-signal timing, dimming PWM, and gauge stepper motor sequencing. The commercial 0C to +70C temperature range is acceptable for cabin-mounted clusters, though under-hood applications should choose the PIC16C662-04I/P industrial variant. The OTP memory locks the firmware permanently, preventing warranty-voiding reflashes in the field — a deliberate design choice for OEM cost-sensitive modules.
Recommended
Security Alarm Panels
The PIC16C662-04/P is well suited for security alarm panels because the OTP memory permanently locks the firmware, preventing an attacker from reflashing the MCU to bypass the alarm logic. Its 33 I/O pins can interface with PIR motion sensors, door/window reed switches, keypad matrices, and siren drivers, while the 176 bytes of RAM provide sufficient scratch storage for zone-state buffers and debounce counters. The two on-chip analog comparators detect sensor-tamper bridges directly. Compared with flash MCUs, the OTP design is a security feature rather than a limitation in this application.
Recommended
Industrial Motor Control (Small BLDC, Stepper Drivers)
The PIC16C662-04/P fits small industrial motor control because the 4 MHz clock delivers 200 ns instruction execution, fast enough for 6-step commutation loops on BLDC motors at speeds up to a few thousand RPM. The 33 I/O pins include capture/compare/PWM-capable channels that drive MOSFET half-bridges through gate drivers. The two analog comparators handle back-EMF zero-cross detection on sensorless BLDC motors, eliminating the need for Hall-effect sensors and reducing BOM cost. The OTP-only memory protects proprietary commutation algorithms from cloning by competitors.
Recommended
HVAC Sensor Interface Boards
The PIC16C662-04/P is a good fit for HVAC sensor interface boards because its two on-chip analog comparators directly threshold thermistor and humidity sensor signals without external op-amps. The 33 I/O pins accept multiple temperature zones, fan-speed control outputs, and communication links to the main thermostat controller. At 5V supply and 4 MHz clock, total power is roughly 25 mW, allowing fanless operation inside wall-mounted thermostat enclosures. The OTP memory suits long-life HVAC products that ship with fixed firmware for 10+ year production runs.
Recommended
General-Purpose Embedded Logic Replacement
The PIC16C662-04/P works as a drop-in logic-replacement MCU for designs that outgrow discrete 74-series glue logic. With 33 I/O, 7 KB OTP, and 176 bytes RAM, it can replace several decoder/demultiplexer/monostable ICs on a board while adding programmability. The 200 ns instruction cycle is fast enough for keyboard scanners, LCD multiplexers, and simple protocol converters (UART to parallel, SPI to GPIO, etc.). OTP memory keeps unit cost low for high-volume consumer products, and the 40-pin PDIP footprint simplifies hand-soldered prototypes and field repair.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662-04/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C662-04I/P | PIC16C662-10/P | PIC16F877A-I/P | PIC16F74-I/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-40 | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same |
| Program Memory Type | OTP | OTP - same | OTP - same | Flash (reprogrammable) | Flash (reprogrammable) |
| Program Memory Size | 7 KB (4K x 14) | 7 KB (4K x 14) - same | 7 KB (4K x 14) - same | 14 KB | 7 KB |
| Maximum Clock Frequency | 4 MHz | 4 MHz - same | 10 MHz | 20 MHz | 20 MHz |
| RAM Size | 176 bytes | 176 bytes - same | 176 bytes - same | 368 bytes | 192 bytes |
| I/O Pins | 33 | 33 - same | 33 - same | 33 - same | 33 - same |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Key Differentiators
- OTP memory locks firmware permanently (vs PIC16F877A-I/P)
- Lower unit cost than flash equivalent (vs PIC16F74-I/P)
- Two on-chip analog comparators (vs PIC16C64A-04/P)
Design Notes
PIC16C662-04/P draws approximately 2-5 mA at 5V/4 MHz depending on I/O loading and peripheral activation. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of pins 19 and 33, plus a bulk 10 uF tantalum or aluminum electrolytic on the supply rail. The dual VDD/VSS pin pairs (19/18 and 33/32) must both be connected, even if a single pair would appear sufficient — leaving one floating creates logic errors and latch-up risk.
Place the crystal or ceramic resonator within 5 mm of OSC1 (pin 8) and OSC2 (pin 9), with the load capacitors grounded to the same VSS island as pin 18. The /MCLR pin (pin 1) requires a 10 kohm pull-up to VDD; adding a 100 nF capacitor from /MCLR to VSS improves noise immunity but slows the reset rise time. Keep analog comparator inputs (RA0-RA3) away from switching traces to avoid false comparator triggers.
OTP memory cannot be erased — a single bit error in the production firmware bricks the entire batch. Always develop and debug on a windowed PIC16CR662 or a flash-based pin-compatible PIC16F877A, then commit the final hex file to PIC16C662-04/P for production. Also note that the watchdog timer is enabled by configuration bit, not by software, so an unintended WDT enable can permanently reset the device every ~18 ms if not serviced in firmware.
Compliance Information
RoHS and REACH status not explicitly stated in the provided verified web data for PIC16C662-04/P. The PDIP-40 package family typically offers both lead-free and lead-containing variants — order the /P suffix variant matching your assembly line requirements. AEC-Q100 is not applicable; for automotive AEC-Q100 qualified PIC16 MCUs consider PIC16F877A-I/P or PIC18F family equivalents.
