PIC16C662-04I/P - 8-Bit 4MHz OTP MCU 7KB Flash 33 I/O | Microchip
MPN: PIC16C662-04I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $5.91 | $2,955.00 |
| 1,000 | $5.07 | $5,070.00 |
PIC16C662-04I/P Overview
An 8-bit microcontroller (MCU) is a small computer-on-a-chip integrating a CPU, RAM, non-volatile program memory (ROM/Flash/OTP), and peripherals on a single die. PIC16C66x family parts use a RISC-based Harvard architecture with 35 single-cycle instructions (200 ns instruction cycle at 20 MHz), simplifying code development while delivering deterministic real-time response. Compared with other 8-bit architectures such as the 8051 or AVR, the PIC16C family emphasizes low part cost, small code size (14-bit instruction word), and a broad peripheral set.
Key features of the PIC16C662 include 33 bidirectional I/O pins, multiple timers (Timer0, Timer1, Timer2), a 5-channel 8-bit analog-to-digital converter, two analog comparators, a USART/SCI serial port, and an 8-bit parallel slave port. The '04' speed grade indicates a 4 MHz maximum oscillator input, while the 'I' suffix denotes the industrial temperature grade of -40 °C to +85 °C, allowing deployment in non-automotive industrial enclosures.
Architecturally, the PIC16C662 uses a 14-bit instruction word with separate program and data buses (Harvard architecture), allowing simultaneous instruction fetch and data access. The OTP program memory uses EPROM cells programmed by a high-voltage pulse from a device programmer, with EPROM windowed parts available for prototype code iteration. Operating from a single 4.5 V to 5.5 V supply, the part draws approximately 2 mA active at 4 MHz and less than 1 µA in sleep mode.
Typical applications include industrial control panels, appliance control boards, sensor signal conditioning, LED driving systems, automotive body controllers (industrial grade), HVAC control, and small consumer appliances. The 40-pin PDIP form factor supports breadboard prototyping and hand-soldered production runs.
When designing with the PIC16C662-04I/P, note that OTP memory cannot be erased, so use the JW windowed variant for prototype development. The 4 MHz speed grade is suitable for control loops and serial communication up to ~76.8 kbps at 8 MHz oscillator.
This page synthesizes distributor pricing, drop-in PIC16C6x alternatives, and practical design notes not found on the Microchip datasheet alone, giving engineers a single reference for sourcing and design decisions.
Drop-in alternatives for PIC16C662-04I/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 PIC16C662-04I/P (same form factor and footprint) — differing in Package, Program Memory Size, Program Memory Type, Operating Temperature, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C661-04I/P
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C662-04E/P
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C662-10I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.1 / Unit
View Datasheet →PIC16C662-20I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.45 / Unit
View Datasheet →PIC16F662-04I/P
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C662-04I/P Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC (Harvard) |
| Instruction Set | 35 instructions, 14-bit word |
| Program Memory Type | OTP EPROM (One-Time-Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 176 bytes |
| Data EEPROM | Not present |
| Maximum Clock Input | 4 MHz (speed grade '04') |
| Instruction Cycle Time | 200 ns at 20 MHz (single-cycle, except branches) |
| Supply Voltage (Vdd) | 4.5 V to 5.5 V |
| I/O Pins | 33 bidirectional |
| Timers | Timer0, Timer1, Timer2 (8-bit/16-bit mix) |
| ADC | 8-bit, 5 channels |
| Analog Comparators | 2 |
| Serial Communication | USART/SCI (asynchronous) |
| Parallel Slave Port | 8-bit PSP |
| Package | 40-pin PDIP (DIP-40, 0.600 in / 15.24 mm) |
| Mounting Type | Through-Hole |
| Operating Temperature | -40 C to +85 C (industrial, 'I' suffix) |
| Active Current | Approximately 2 mA at 4 MHz / 5 V |
| Sleep Current | < 1 uA typical |
| RoHS Status | Compliant (Pb-free) |
PIC16C662-04I/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 / 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 | RE0/RD/AN5 — PORTE bit 0 / parallel slave read / analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / parallel slave write / analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / parallel slave chip select / analog input 7 |
| Pin 11 | VDD — Positive supply voltage (4.5 V to 5.5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM/capture |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 21 | RC6/TX/CK — PORTC bit 6 / USART async transmit / clock |
| Pin 22 | RC7/RX/DT — PORTC bit 7 / USART async receive / data |
| Pin 23 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| Pin 24 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| Pin 25 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| Pin 26 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| 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 (second Vss pin) |
| Pin 32 | VDD — Positive supply voltage (second Vdd pin) |
| 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 — PORTB bit 6 |
| Pin 40 | RB7 — PORTB bit 7 |
Typical Applications
PIC16C662-04I/P is suitable for 6 applications: Industrial Control Panels, Home Appliance Control, Sensor Signal Conditioning, LED Lighting Drivers, HVAC Climate Control, Automotive Body Controllers (non-safety).
Industrial Control Panels
The PIC16C662-04I/P fits industrial control panels because it operates from a 5 V rail across the industrial temperature range of -40 C to +85 C, offers 33 I/O lines for switches, relays, and indicator LEDs, and provides two analog comparators plus a 5-channel 8-bit ADC for transducer feedback. Its 4 MHz oscillator rating handles button debouncing, relay sequencing, and slow serial polling without strain. The 40-pin PDIP package supports wave soldering and hand rework on legacy panel designs where surface-mount assembly lines are not available.
Recommended
Home Appliance Control
For washing machines, dishwashers, and small kitchen appliances, the PIC16C662-04I/P delivers enough program space (7 KB) for multi-state machine logic, while 33 I/O pins drive solenoid valves, motor relays, LED indicators, and keypad buttons. The OTP memory is well suited to consumer volumes where firmware is finalized and unit cost dominates. Sleep current below 1 uA supports battery-backed clock retention during standby, prolonging energy ratings on EnergyStar-labelled appliances.
Recommended
Sensor Signal Conditioning
The PIC16C662-04I/P's 5-channel 8-bit ADC and two analog comparators handle thermocouple, thermistor, photodiode, and pressure-bridge signal conditioning in industrial sensor nodes. At 4 MHz, ADC conversion completes in microseconds, enabling fast multiplexed readings across multiple transducer channels. The USART/SCI module streams conditioned data to upstream PLCs or display modules at standard baud rates, while 33 I/O lines accept digital sensors and route control outputs. Industrial temperature grade ensures outdoor or cabinet-mounted reliability.
Recommended
LED Lighting Drivers
Architectural and signage LED drivers benefit from the PIC16C662-04I/P's PWM-capable Timer2, 33 outputs to switch multiple LED strings, and small 40-pin PDIP footprint. OTP memory locks the desired color sequence or animation, preventing field tampering of installed fixtures. The 4 MHz clock rate supports PWM frequencies above 100 Hz to avoid visible flicker while still leaving headroom for serial command reception on the USART, useful for DMX-style lighting buses.
Recommended
HVAC Climate Control
HVAC wall thermostats and zone controllers use the PIC16C662-04I/P to read temperature setpoint encoders, drive triac-controlled fan stages, and multiplex multiple sensor inputs. The 8-bit ADC captures thermistor and humidity sensor voltages, while 33 I/O lines handle keypad scanning, seven-segment displays, and relay drivers. Industrial temperature operation ensures reliable performance in unconditioned equipment rooms and rooftop unit enclosures where temperatures swing widely.
Recommended
Automotive Body Controllers (non-safety)
Non-safety body controllers such as seat adjusters, mirror positioners, and interior lighting strips can use the PIC16C662-04I/P's 33 I/O pins for switch matrix scanning, motor H-bridge enable, and LED current control. The industrial temperature grade covers most cabin environments, while the USART interfaces with the body network for diagnostics. OTP memory locks the calibration once validated, preventing unauthorized field modification of comfort-feature firmware.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662-04I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C661-04I/P | PIC16C662-04E/P | PIC16C662-10I/P | PIC16C662-20I/P | PIC16F662-04I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-40 (0.600 in) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) |
| Program Memory Type | OTP EPROM (7 KB / 4K x 14) | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash (in-circuit reprogrammable) |
| Program Memory Size | 7 KB (4K x 14 words) | 3.5 KB (2K x 14) - 50% of PIC16C662 | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) |
| Maximum Clock Input | 4 MHz | 4 MHz | 4 MHz | 10 MHz | 20 MHz | 4 MHz |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
| Data RAM | 176 bytes | 176 bytes | 176 bytes | 176 bytes | 176 bytes | 176 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Peripherals (ADC / Comparators / USART) | 5-ch 8-bit ADC / 2 / yes | 5-ch 8-bit ADC / 2 / yes | 5-ch 8-bit ADC / 2 / yes | 5-ch 8-bit ADC / 2 / yes | 5-ch 8-bit ADC / 2 / yes | 5-ch 8-bit ADC / 2 / yes |
Key Differentiators
- Pin-compatible Flash upgrade available for late-stage firmware changes (vs PIC16F662-04I/P)
- Higher speed grades available without PCB changes (vs PIC16C662-20I/P)
- Lower-memory sibling fits smaller firmware footprints (vs PIC16C661-04I/P)
Design Notes
PIC16C662 OTP memory can be programmed only once via high-voltage (typically 13 V) on the MCLR/VPP pin using a device programmer such as the MPLAB PM3. For prototyping, use the PIC16C662 JW windowed ceramic-DIP variant (not the 'I/P' plastic package) which allows UV erasure and re-programming. Do not design production firmware without a working windowed prototype; once the plastic OTP part is programmed, errors cannot be corrected.
Apply a 0.1 uF decoupling capacitor directly between VDD (pin 11 or 32) and VSS (pin 12 or 31), keeping trace lengths under 5 mm. Add a 10 uF bulk capacitor near the supply entry point. Place the decoupling cap as close as physically possible to the MCU VDD pins; long traces introduce inductive spikes that can corrupt the ADC during high-current output transitions on PORTB or PORTD.
Configure unused I/O pins as outputs and tie them to VSS or VDD - floating inputs can draw excessive supply current (several mA) and may oscillate, injecting noise into the ADC. For PORTA analog-capable pins, disable the digital input buffer by clearing the corresponding PCFG bit in the ADCON1 register when configuring the pin for analog use, which prevents digital input buffer crossover current.
Keep analog input traces (RA0-RA5, RE0-RE2) short and routed away from switching outputs like PWM outputs on RC1/RC2 or PORTD parallel slave port lines. Use a ground pour under the MCU and route analog ground separately back to the regulator. The 8-bit ADC achieves datasheet accuracy only when analog and digital ground returns are properly separated; poor layout can reduce effective ADC resolution to 6-7 bits.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - the 'I' temperature grade (-40 C to +85 C) is industrial, not automotive safety-grade. For automotive applications requiring AEC-Q100, use a PIC16F or dsPIC variant instead.
