PIC16C662T-04E/L - 8-Bit 4MHz OTP MCU 7KB | Microchip
MPN: PIC16C662T-04E/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
PIC16C662T-04E/L 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. Within the broader taxonomy, the PIC16C662 belongs to the RISC microcontroller family -> 8-bit MCU -> embedded controller -> semiconductor IC. The PIC16C6x family specifically emphasizes Harvard-architecture RISC design with only 35 instructions, simplifying firmware development and code verification for production fleets.
Key features include 7KB OTP program memory (one-time programmable, suitable for low-to-medium volume production where firmware is stable), 176 bytes of general-purpose RAM, 33 digital I/O lines, and 20 MHz maximum oscillator input (the "-04" suffix denotes the 4 MHz speed grade). The 44-PLCC package is JEDEC-standard, surface-mountable, and supported by a wide ecosystem of sockets and carriers for both production and prototype environments.
From an architectural perspective, the PIC16C662 uses a 14-bit instruction word with a single accumulator (W) plus a file-register-based data memory map. Its RISC pipeline delivers deterministic 200 ns instruction cycles at 4 MHz (or 100 ns at 20 MHz), simplifying real-time control loop timing. The OTP memory reduces per-unit cost versus flash while requiring careful pre-production firmware verification, since post-programming code changes are not possible.
Typical applications include automotive body and chassis controllers, industrial automation subsystems, appliance control boards, and legacy embedded products requiring long-term microchip supply continuity. The 33 I/O pins and 7KB code space are well-matched to mid-complexity control logic with several switch inputs, relay outputs, and serial communications.
When designing with this part, plan the firmware verification process before committing to OTP programming, since parts cannot be re-programmed. The automotive temperature grade ("-E" suffix, -40C to +125C) and PLCC-44 footprint make it drop-in compatible with other PIC16C662 variants in the same family, simplifying second-source qualification.
This page synthesizes verified distributor pricing, same-family drop-in alternatives, and practical design notes for legacy PIC16C662 designs not found in any single distributor listing or manufacturer page.
Drop-in alternatives for PIC16C662T-04E/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 PIC16C662T-04E/L (same form factor and footprint) — differing in Package, Program Memory Type, Mounting Type, Temperature Grade, Watchdog Timer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C662-04E/L
✅ Drop-In✓ In Stock
$8.95 / Unit
View Datasheet →PIC16C662-10E/L
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →PIC16C662-20E/L
✅ Drop-In✓ In Stock
$10.75 / Unit
View Datasheet →PIC16C662T-04I/L
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC16F877-04/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C662T-04E/L Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Product Family | PIC16C6x |
| Core Architecture | 8-bit RISC (Harvard) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 176 bytes |
| Maximum Clock Frequency | 20 MHz |
| Operating Clock (this grade) | 4 MHz (-04 speed grade) |
| Instruction Cycle Time | 200 ns (single-cycle), 400 ns (branch) |
| Instruction Set Size | 35 instructions |
| Supply Voltage (Vdd) | 4.5 V to 5.5 V |
| I/O Pins | 33 |
| Package | 44-pin PLCC (J-Lead) |
| Package Dimensions | 16.59 mm x 16.59 mm |
| Operating Temperature Range | -40 C to +125 C (Automotive, "E" grade) |
| Mounting Type | Surface Mount |
PIC16C662T-04E/L 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 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
| Pin 11 | Vdd — Positive supply voltage (4.5V to 5.5V) |
| Pin 12 | Vss — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 15 | RC0 — PORTC bit 0 |
| Pin 16 | RC1 — PORTC bit 1 |
| Pin 17 | RC2 — PORTC bit 2 |
| Pin 18 | RC3 — PORTC bit 3 |
| Pin 19 | RD0 — PORTD bit 0 |
| Pin 20 | RD1 — PORTD bit 1 |
| Pin 21 | RD2 — PORTD bit 2 |
| Pin 22 | RD3 — PORTD bit 3 |
| Pin 23 | RC4 — PORTC bit 4 |
| Pin 24 | RC5 — PORTC bit 5 |
| Pin 25 | RC6 — PORTC bit 6 |
| Pin 26 | RC7 — PORTC bit 7 |
| Pin 27 | RD4 — PORTD bit 4 |
| Pin 28 | RD5 — PORTD bit 5 |
| Pin 29 | RD6 — PORTD bit 6 |
| Pin 30 | RD7 — PORTD bit 7 |
| Pin 31 | Vss — Ground reference |
| Pin 32 | Vdd — Positive supply voltage (4.5V to 5.5V) |
| Pin 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| 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 |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C662T-04E/L is suitable for 7 applications: Automotive Body Control Modules, Industrial Automation Controllers, White Goods and Appliance Control, HVAC Climate Control Subsystems, Security and Access Control Panels, Consumer Electronics User Interface Controllers, Point-of-Sale Terminal Peripherals.
Automotive Body Control Modules
The PIC16C662T-04E/L is well-suited for automotive body and chassis control modules such as central locking, mirror control, wiper controllers, and interior lighting. Its 7KB OTP memory fits mid-complexity control logic with multiple switch inputs and relay outputs, while the 33 I/O pins easily map to the GPIO needs of typical BCM designs. The -40C to +125C automotive temperature grade (E suffix) and 5V supply match automotive 12V-battery-derived rails after regulator down-conversion. Compared to flash MCUs, the OTP silicon offers cost advantages at high volume and reduced susceptibility to unauthorized firmware read-back. The 4 MHz clock provides ample headroom for switch-debounce loops, PWM-driven lighting, and LIN-bus-friendly bit-banged serial communication when an external transceiver is used.
Recommended
Industrial Automation Controllers
The PIC16C662T-04E/L fits small industrial controllers like conveyor sorters, pump sequencers, and simple PLC I/O expansion cards. Its RISC 35-instruction set and deterministic 200 ns instruction cycle (at 4 MHz) simplify real-time loop design where scan-time predictability is critical. The 33 I/O lines support combinations of digital inputs (limit switches, sensors) and outputs (relay coils, solenoid drivers, indicator LEDs), while 7KB of OTP holds ladder-logic-style control code for fixed automation sequences. The automotive temperature grade provides extra margin in factory cabinets with wide ambient swings, and the PLCC-44 package is socket-friendly for field replacement. Designers pair it with optocouplers for high-voltage isolation and 24V-to-5V DC-DC converters for industrial 24V bus rails.
Recommended
White Goods and Appliance Control
The PIC16C662T-04E/L is widely deployed in major-appliance control boards for washing machines, dishwashers, ovens, and microwave user interfaces. The 7KB OTP comfortably stores motor-control state machines, user-interface scanning routines, and safety-interlock logic, while 176 bytes of RAM is sufficient for sensor averaging and timer variables. Its 33 I/O drive keypad matrixes, seven-segment displays, triac-triggered heater controls, and buzzer feedback lines from a single chip. The wide 4.5V-5.5V supply tolerates rectified mains-derived rails after regulation, and the automotive-grade temperature range survives the heat of an oven or dryer enclosure. High-volume production benefits from OTP silicon pricing where firmware has been frozen across multiple product generations.
Recommended
HVAC Climate Control Subsystems
In HVAC indoor units, thermostats, and zoning controllers, the PIC16C662T-04E/L orchestrates temperature sensing, fan-speed switching, mode selection, and user-interface handling. The OTP memory holds fixed control algorithms (PI loops, hysteresis-based fan control), and the 33 I/O count accommodates NTC thermistor inputs, button matrixes, triac outputs for compressor and reversing-valve control, and serial links to indoor-outdoor communication. Its deterministic 200 ns instruction cycle supports time-critical PWM generation for variable-speed blower motors when paired with external gate drivers. The automotive temperature rating suits attic and rooftop installations where ambient swings are extreme.
Recommended
Security and Access Control Panels
The PIC16C662T-04E/L fits entry-level security panels, keypad readers, and access-control modules where its OTP memory locks firmware against tampering and reverse engineering. The 7KB code space stores zone-input scanning, alarm-state machine, dialer sequences, and keypad debounce routines, while the 33 I/O drive reed-switch zones, PIR sensor inputs, siren drivers, and 4x4 keypad matrixes. PIC16C662's RISC core deterministically services multiple sensor inputs within tight scan windows, reducing false-alarm latency. Automotive temperature grade supports outdoor keypad housings, and the PLCC package accommodates socketed field replacement by service technicians.
Recommended
Consumer Electronics User Interface Controllers
The PIC16C662T-04E/L serves as a user-interface controller in mid-complexity consumer products such as audio amplifiers, set-top boxes, and small home appliances. Its 33 I/O drives IR receivers, rotary encoders, button matrixes, LED indicators, and dot-matrix or character LCDs with parallel interface. The 7KB OTP holds menu navigation logic, IR protocol decoders (RC5, NEC), and audio source-selection state machines. The 4 MHz clock is sufficient for bit-banged IR decoding and software UART communication to companion Wi-Fi or Bluetooth modules. OTP pricing is attractive for cost-sensitive consumer SKUs shipped in the millions.
Recommended
Point-of-Sale Terminal Peripherals
In POS peripherals such as receipt printers, barcode scanners, and customer displays, the PIC16C662T-04E/L handles stepper-motor control for paper feed, GPIO for sensor monitoring, and serial communication to the host terminal. Its 7KB OTP stores the print-head driving waveforms and command parsing logic for ESC/POS-style protocols, while 33 I/O lines are sufficient for the stepper phases, paper-out sensors, and front-panel button matrix. The OTP memory locks the printer firmware against tampering that could compromise receipt integrity. Its wide supply range tolerates USB-powered 5V rails common in modern POS equipment.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662T-04E/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C662-04E/L | PIC16C662-10E/L | PIC16C662-20E/L | PIC16C662T-04I/L | PIC16F877-04/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC (J-Lead) | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same |
| Program Memory Type | OTP (7 KB) | OTP (7 KB) - same | OTP (7 KB) - same | OTP (7 KB) - same | OTP (7 KB) - same | Flash (8 KB) - re-programmable |
| Data RAM | 176 bytes | 176 bytes | 176 bytes | 176 bytes | 176 bytes | 368 bytes (+109%) |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 10 MHz (+150%) | 20 MHz (+400%) | 4 MHz | 4 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
Key Differentiators
- One-Time Programmable silicon for tamper-resistant firmware (vs PIC16F877-04/L (Flash))
- 4 MHz speed grade with guaranteed timing closure (vs PIC16C662-20E/L (20 MHz))
- Tape-and-reel packaging for high-volume SMD assembly (vs PIC16C662-04E/L (tube))
- Automotive temperature grade for harsh-environment deployment (vs PIC16C662T-04I/L (Industrial grade))
Design Notes
OTP memory cannot be erased or re-programmed: verify firmware exhaustively in engineering samples (windowed or flash equivalents like PIC16F877A) before committing to production programming of PIC16C662T-04E/L. A single firmware bug in OTP requires scrapping all programmed parts. Always program a small pilot batch first, perform full functional and EMC validation, then release for volume programming.
The PIC16C662T-04E/L requires a stable 5V supply (4.5V to 5.5V). For automotive 12V battery applications, use a low-dropout regulator such as MCP1700 with at least 10uF of input and output bulk capacitance plus a 100nF ceramic bypass close to the Vdd pins (11 and 32). Both Vdd pins must be connected; both Vss pins (12 and 31) must be grounded to ensure proper I/O drive symmetry and reduced digital noise injection into analog inputs.
Place the 4 MHz crystal or resonator (with load capacitors per manufacturer datasheet) within 5 mm of OSC1 (pin 13) and OSC2 (pin 14) to minimize clock distortion and EMI. Route the MCLR/Vpp pin (pin 1) with a 10 kohm pull-up to Vdd; for ICSP programming, add an in-line resistor or jumper so the programmer can pull MCLR low without disturbing the pull-up. Keep analog reference pins (RA3/Vref) bypassed with 100 nF ceramic if used as reference voltage.
Although the PIC16C662T-04E/L is rated -40C to +125C junction temperature, the PLCC-44 plastic package has limited heat dissipation. In enclosed automotive or industrial cabinets, ensure ambient temperature does not exceed 85C for reliable long-term operation with margin. For continuous high-temperature environments, derate by 10C or specify an industrial-grade variant. The automotive E-grade itself is suitable for under-hood engine-adjacent applications.
The 44-pin PLCC J-lead footprint requires plated through-holes on the PCB (PLCC is a through-hole-mount package, not a true SMT pad). For low-volume prototypes, use a PLCC-44 socket so parts can be swapped without desoldering. For volume SMT assembly, an adapter board to TQFP-44 may be considered, but this is a redesign not a drop-in. Keep all I/O traces short and route sensitive analog signals (RA0-RA5, RE0-RE2) away from digital switching lines to minimize crosstalk.
Compliance Information
Lifecycle status is ACTIVE per digchip.com datasheet listing. MSL level, RoHS, REACH, lead-free, halogen-free, and conflict-minerals compliance were not present in the verified web data and are marked as [DATA_NEEDED] in the specs array. The E (automotive) temperature grade is -40C to +125C but does not imply AEC-Q100 qualification; PIC16C662T-04E/L is not listed in Microchip's AEC-Q100 catalog for this part family.
