PIC16C662T-04I/PQ - 4MHz 8-bit OTP MCU, 7KB ROM, 44-MQFP | Microchip
MPN: PIC16C662T-04I/PQ β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.05 | $80.50 |
| 100 | $7.15 | $715.00 |
| 500 | $6.45 | $3,225.00 |
| 1,000 | $5.85 | $5,850.00 |
PIC16C662T-04I/PQ Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals and interrupt logic onto one silicon die. Within the broader taxonomy, PIC microcontrollers sit under microcontroller -> embedded processor -> integrated circuit -> semiconductor. PIC16C-series OTP parts target cost-sensitive, low-volume and legacy embedded designs where the firmware is finalized before mask programming and field updates are not required.
Key features of the PIC16C662 include a 14-bit instruction word, an advanced RISC Harvard architecture, 33 single-word instructions, a hardware timer/counter, parallel slave port, and integrated analog comparator peripherals. The 40-pin/44-pin PIC16C64X and PIC16C66X family is upward-compatible with smaller 28-pin PIC16CXXX members, allowing code reuse across product variants. Power consumption is in the low milliamp range typical of CMOS PIC devices.
The PIC16C662 architecture uses a separate 14-bit program bus and 8-bit data bus (Harvard), enabling most instructions to execute in a single 250 ns instruction cycle at 4 MHz oscillator frequency. The device includes power-on reset, brown-out reset, watchdog timer, and code-protection bits. Peripherals include a synchronous serial port (SSP) for SPI/I2C, a USART, capture/compare/PWM modules, and analog comparators on selected pins.
Typical applications include industrial control logic, appliance controllers, automotive body electronics (non-safety), instrumentation front-ends, and replacement of older PIC16C5X designs where a 14-bit instruction word is required. The 44-pin MQFP footprint exposes a generous I/O count suitable for keypad scanning, LCD drive, and multi-channel sensor interfaces.
When designing with this part, remember that OTP ROM cannot be re-programmed, so allocate a separate PIC16C66X flash variant (e.g., PIC16F877) for prototypes, and verify the I-grade (-40C to +85C) temperature window against your enclosure thermal profile. Programming requires the Microchip PM3 or MPLAB ICD tools.
This page synthesizes distributor stock, pricing and drop-in alternative data not available in a single manufacturer document, including recommended same-package drop-in replacements from the PIC16C662 family and verified cross-brand pin-compatible parts.
Drop-in alternatives for PIC16C662T-04I/PQ β 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-04I/PQ (same form factor and footprint) β differing in Instruction Cycle Time, Maximum Clock Frequency, Operating Temperature, Program Memory Size, Program Memory Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C662-04I/PQ
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16C662-20/PQ
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$9.75 / Unit
View Datasheet βPIC16F877A-I/PQ
β Drop-Inπ Reference alternative (not in catalog)
PIC16C662T-04I/PQ Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4096 x 14-bit) |
| Data RAM | 176 bytes |
| Instruction Word Width | 14-bit |
| Instruction Set Size | 33 instructions (single-word) |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 1 us at 4 MHz |
| Supply Voltage (Vdd) | 4 V to 6 V (5 V typical) |
| Operating Temperature | -40C to +85C (industrial, I-grade) |
| Package | 44-pin MQFP (PQ) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
PIC16C662T-04I/PQ 44-pin mqfp (pq) Pin Configuration Guide
Pin configuration for PIC16C662T-04I/PQ (44-pin mqfp (pq) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC16C662T-04I/PQ.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16C662T-04I/PQ is suitable for 6 applications: Industrial Control Logic, Appliance Control Board, Automotive Body Electronics, Instrumentation Front-End, Legacy PIC16C5X Replacement, Embedded Sensor Interface Hub.
Industrial Control Logic
The PIC16C662T-04I/PQ fits industrial control logic applications that demand deterministic 1 us instruction cycles and a -40C to +85C industrial temperature window. The 7 KB OTP EPROM stores fixed control algorithms for motor starters, conveyor sequencers and process interlocks, while the 176-byte RAM handles state variables, debounced inputs and PWM control loops. The 5 V single-supply operation aligns with legacy 5 V PLC backplanes, and the 44-pin MQFP package exposes up to 33 digital I/O pins sufficient for keypad scanning, LED annunciators and discrete sensor inputs without external I/O expanders.
Recommended
Appliance Control Board
The PIC16C662T-04I/PQ is well suited for appliance controllers such as washing machines, microwave ovens, dishwashers and refrigerator main boards. The OTP memory locks firmware against unauthorized field modification, while the 14-bit instruction word delivers fast bit-manipulation capability for relay drivers, triac phase-angle control and seven-segment display multiplexing. The CMOS PIC16CXXX core consumes low current in sleep mode, extending battery-backed clock and timer functions, and the 44-pin MQFP package's gull-wing leads survive vibration environments typical of home appliances.
Recommended
Automotive Body Electronics
The PIC16C662T-04I/PQ serves automotive body electronics including HVAC actuators, seat controllers, instrument cluster sub-modules, lighting controllers and door modules where AEC-Q100 is not mandated. The industrial -40C to +85C temperature grade covers cabin environments, and the PIC16CXXX 8-bit RISC core with single-cycle 1 us instructions reliably scans switch matrices and drives relays under real-time interrupt load. While not automotive-qualified, OTP-only memory prevents inadvertent firmware reflash in field service environments, and the 44-pin MQFP supports automated pick-and-place assembly on body electronics production lines.
Recommended
Instrumentation Front-End
The PIC16C662T-04I/PQ fits instrumentation front-end designs including digital panel meters, weighing scales, laboratory data loggers and bench-top multimeters. The 176-byte RAM buffers acquisition samples from external ADCs, while the OTP EPROM stores calibration tables and user-interface strings. The PIC16CXXX core's 33 single-word instructions enable compact code for LCD drivers, keyboard decoders and serial-port (USART) communication with PCs. The 44-pin MQFP package's 0.8 mm lead pitch accommodates dense instrument layouts and supports wave-solder and reflow profiles used in commercial test equipment.
Recommended
Legacy PIC16C5X Replacement
The PIC16C662T-04I/PQ targets replacement of older PIC16C5X and PIC16C64X designs that benefit from the upgraded 14-bit instruction set, larger memory and richer peripherals while retaining the same OTP cost model. Engineers migrating from 12-bit PIC16C5X cores gain a five-fold RAM increase (176 vs 36 bytes) and 14-bit instruction efficiency for compact code generation. The 44-pin MQFP footprint aligns with existing 28-pin and 40-pin PIC16CXXX board layouts through I/O pin remapping in MPLAB, simplifying the upgrade path for established industrial product lines.
Recommended
Embedded Sensor Interface Hub
The PIC16C662T-04I/PQ operates as an embedded sensor interface hub, aggregating data from thermistors, switches, encoders and analog comparators in environmental monitoring and HVAC systems. Its PIC16CXXX core provides deterministic timing for sensor sampling and interrupt-driven I/O handling, while the OTP memory securely stores calibration coefficients and product-specific firmware variants. The 5 V supply tolerance aligns with industrial sensor power rails, and the 44-pin MQFP package supports SPI or I2C master communication to remote sensor boards and external EEPROM for data logging in unattended installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662T-04I/PQ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C662-04I/P | PIC16C662-20I/P | PIC16C662-04I/PQ | PIC16C662-20/PQ | PIC16F877A-I/PQ |
|---|---|---|---|---|---|---|
| Package | 44-pin MQFP (PQ) | 40-pin PDIP - NOT pin-compatible | 40-pin PDIP - NOT pin-compatible | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP EPROM (7 KB) | OTP EPROM (7 KB) | OTP EPROM (7 KB) | OTP EPROM (7 KB) | OTP EPROM (7 KB) | Flash (14 KB) |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz |
| Data RAM | 176 bytes | 176 bytes | 176 bytes | 176 bytes | 176 bytes | 368 bytes |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C (commercial) | -40C to +85C |
| Reprogrammable | No (OTP) | No (OTP) | No (OTP) | No (OTP) | No (OTP) | Yes (Flash, ICSP) |
| Lifecycle Status (2026) | NRND | NRND | NRND | NRND | NRND | Active |
Key Differentiators
- Drop-in 4 MHz OTP sibling with identical die and packaging (vs PIC16C662-04I/PQ)
- Upgrade path to 20 MHz in same 44-pin MQFP footprint (vs PIC16C662-20/PQ)
- Field-upgradeable flash variant for new designs (vs PIC16F877A-I/PQ)
Design Notes
OTP ROM cannot be re-programmed. If the firmware is not fully validated, scrap the device on each code revision. Use the flash-based PIC16F877A-I/PQ for prototype phases and only commit to the PIC16C662T-04I/PQ OTP version once firmware is locked. A blank OTP part can be programmed exactly once using Microchip PM3 or MPLAB ICD; subsequent attempts will fail or partially program.
Operate Vdd within 4 V to 6 V; a 5 V regulated rail is typical. Add a 100 nF ceramic decoupling capacitor close to each Vdd pin and a 10 uF bulk capacitor at the board supply entry. Brown-out reset should be enabled in the configuration word so a sagging supply does not corrupt the 176-byte data RAM or cause undefined I/O behavior.
The 44-pin MQFP package uses 0.8 mm pitch gull-wing leads. Reserve at least 0.5 mm clearance between package leads and adjacent traces, and avoid routing signals within 2 mm of the package body to reduce solder-bridge risk during reflow. The exposed die-pad is not present on MQFP, but a thermal copper pour under the package helps dissipate the low-heat PIC CMOS core.
The MCLR reset pin must be pulled high through a 10 kohm resistor for normal operation; leaving it floating can cause intermittent resets or program-mode entry. The OSC1/OSC2 pins require a stable crystal or resonator; a 4 MHz part cannot use an 8 MHz or 20 MHz oscillator without speed-grade derating, and switching to a higher speed grade requires migrating to the PIC16C662-20/PQ.
Compliance Information
AEC-Q100 status not qualified - this is an industrial-grade part not automotive-qualified. RoHS/REACH/lead-free status not explicitly stated in the verified web data; manufacturer datasheet should be consulted for the latest compliance certificate.
