PIC16C662T-04E/PT - 8-bit MCU, 7KB OTP, 33 I/O | Microchip
MPN: PIC16C662T-04E/PT β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $9.2 | $92.00 |
| 100 | $8.1 | $810.00 |
| 500 | $7.05 | $3,525.00 |
| 1,000 | $6.2 | $6,200.00 |
PIC16C662T-04E/PT Overview
An 8-bit microcontroller (MCU) is a small programmable computer on a single integrated circuit that combines a CPU, memory, and peripherals. Within the broader semiconductor hierarchy, MCUs belong to microcontrollers -> microcomputers -> processors -> semiconductors. The PIC16C6x family specifically targets low-power, cost-sensitive embedded control where deterministic instruction execution (a single-cycle RISC core) and a rich peripheral set matter more than raw clock speed.
Key features of the PIC16C662 include its 14-bit instruction word, 8-level hardware stack, two 8-bit timers and one 16-bit timer/counter, a Watchdog Timer with its own on-chip RC oscillator, an analog comparator, a capture/compare/PWM (CCP) module, and a synchronous/asynchronous serial port (USART/SCI). The part also offers power-saving SLEEP mode, in-circuit serial programming (ICSP) capability, and programmable code protection.
Architecturally, the PIC16C662 uses a Harvard-class RISC core with separate program and data buses, which lets a 14-bit instruction fetch and an 8-bit data read occur in the same Tcy. This yields predictable 4 MHz performance at 4 MHz oscillator input on the -04 speed grade and predictable interrupt latency for real-time control loops.
Typical applications include white-goods and appliance control, low-end industrial automation, automotive body and interior modules, HVAC fan and damper control, and battery-powered instrumentation where the OTP memory and CMOS low-power design provide a favorable cost-per-function ratio. The wide 33-I/O count also makes it suitable for keyboard-scanning, LED-driving, and simple user-interface boards.
When designing with this device, note that OTP memory is one-time programmable and cannot be erased, so firmware must be fully validated before programming. Decoupling, ground-return integrity, and an external oscillator or resonator circuit (if accuracy beyond the internal RC is required) are the three most common layout items to review.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, with cross-references to PIC16C662 variants for engineers seeking pin-compatible alternatives.
Drop-in alternatives for PIC16C662T-04E/PT 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-04E/PT (same form factor and footprint) β differing in Program Memory Type, RoHS Status, Package, Program Memory Size, Core Architecture.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C662-04E/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C662-20E/PT
β Drop-Inβ In Stock
$8.2 / Unit
View Datasheet βPIC16C662T-04I/PT
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$5.2 / Unit
View Datasheet βPIC16F747-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C662T-04E/PT Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit RISC Microcontroller (MCU) |
| Core Architecture | PIC16 Harvard-class RISC |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| Instruction Word Width | 14 bits |
| RAM Size | 176 bytes |
| EEPROM Size | Not present |
| Number of I/O Pins | 33 |
| Maximum Clock Frequency | 4 MHz (speed grade -04) |
| Supply Voltage (Vcc) | 4 V to 6 V |
| ADC | Not present (digital-only MCU) |
| Timers | Two 8-bit + one 16-bit Timer/Counter |
| Serial Interface | USART/SCI (synchronous + asynchronous) |
| Capture/Compare/PWM (CCP) | Yes |
| Analog Comparator | Yes |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| Package | 44-pin TQFP (PT), 10x10 mm |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +125C (Extended, -E suffix) |
| RoHS Status | Non-compliant (legacy OTP) |
| Lead-Free | unknown |
PIC16C662T-04E/PT Pin Configuration
| Pin 1 | OSC1/CLKIN β Oscillator input / external clock input |
| Pin 2 | RA0/AN0 β Digital I/O / analog comparator input (no ADC on this part) |
| Pin 3 | RA1/AN1 β Digital I/O / analog comparator input |
| Pin 4 | RA2/AN2 β Digital I/O / analog comparator reference |
| Pin 5 | RA3/AN3 β Digital I/O / analog comparator output |
| Pin 6 | RA4/T0CKI β Digital I/O / Timer0 clock input |
| Pin 7 | RA5/SS β Digital I/O / SPI slave select |
| Pin 8 | Vss β Ground |
| Pin 9 | OSC2/CLKOUT β Oscillator output / clock output |
| Pin 10 | RC0/T1OSO/T1CKI β Digital I/O / Timer1 oscillator output or clock input |
| Pin 11 | RC1/T1OSI/CCP2 β Digital I/O / Timer1 oscillator input / CCP2 |
| Pin 12 | RC2/CCP1 β Digital I/O / CCP1 PWM output |
| Pin 13 | RC3/SCK/SCL β Digital I/O / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA β Digital I/O / SPI data in / I2C data |
| Pin 15 | RC5/SDO β Digital I/O / SPI data out |
| Pin 16 | RC6/TX/CK β Digital I/O / USART TX / clock |
| Pin 17 | RC7/RX/DT β Digital I/O / USART RX / data |
| Pin 18 | Vss β Ground |
| Pin 19 | Vdd β Positive supply (4 V to 6 V) |
| Pin 20 | RB0/INT β Digital I/O / external interrupt |
| Pin 21 | RB1 β Digital I/O |
| Pin 22 | RB2 β Digital I/O |
| Pin 23 | RB3/PGM β Digital I/O / low-voltage programming |
| Pin 24 | RB4 β Digital I/O / interrupt-on-change |
| Pin 25 | RB5 β Digital I/O / interrupt-on-change |
| Pin 26 | RB6/PGC β Digital I/O / ICSP clock |
| Pin 27 | RB7/PGD β Digital I/O / ICSP data |
| Pin 28 | Vdd β Positive supply (4 V to 6 V) |
| Pin 29 | Vss β Ground |
| Pin 30 | RD0 β Digital I/O |
| Pin 31 | RD1 β Digital I/O |
| Pin 32 | RD2 β Digital I/O |
| Pin 33 | RD3 β Digital I/O |
| Pin 34 | RD4 β Digital I/O |
| Pin 35 | RD5 β Digital I/O |
| Pin 36 | RD6 β Digital I/O |
| Pin 37 | RD7 β Digital I/O |
| Pin 38 | Vss β Ground |
| Pin 39 | Vdd β Positive supply (4 V to 6 V) |
| Pin 40 | RE0/RD β Digital I/O / parallel slave port read |
| Pin 41 | RE1/WR β Digital I/O / parallel slave port write |
| Pin 42 | RE2/CS β Digital I/O / parallel slave port chip select |
| Pin 43 | Vss β Ground |
| Pin 44 | MCLR/Vpp β Master clear (reset) / programming voltage |
Typical Applications
PIC16C662T-04E/PT is suitable for 7 applications: White Goods and Appliance Control, Automotive Body and Interior Modules, HVAC Fan and Damper Control, Battery-Powered Instrumentation, User Interface and Keypad Scanning, Industrial Sensor Interface Boards, Smart Home Edge Controllers.
White Goods and Appliance Control
The PIC16C662T-04E/PT's 33 I/O count, 7 KB OTP memory, and low CMOS operating current make it a cost-effective controller for washing-machine, dishwasher, microwave, and refrigerator boards. The 4 MHz instruction cycle gives 1 us deterministic loop times, which is sufficient for relay and triac sequencing, keypad scanning, and LED display multiplexing. Pin compatibility with the flash-based PIC16F747 family enables field firmware updates without changing PCB layout.
Recommended
Automotive Body and Interior Modules
With the extended -40C to +125C temperature grade (-E suffix) and 33 digital I/O lines, the PIC16C662T-04E/PT fits body controllers, mirror adjusters, seat controllers, and interior lighting modules. The on-chip USART enables LIN-bus slave communication via an external LIN transceiver. Note that the part is not AEC-Q100 qualified - for new automotive designs migrate to AEC-Q100-qualified PIC16F equivalents or dsPIC33 family members.
Recommended
HVAC Fan and Damper Control
The PIC16C662's two 8-bit timers plus one 16-bit timer support the multi-channel PWM needed for fan-speed control and damper actuator drive via the on-chip CCP module. Its 4 V to 6 V supply range matches 5 V HVAC board rails directly without an extra LDO. The 176 bytes of RAM are sufficient for proportional control loops, while the 7 KB OTP holds the full control law and look-up tables.
Recommended
Battery-Powered Instrumentation
The PIC16C662's CMOS design, low quiescent current in SLEEP mode, and programmable Watchdog Timer with dedicated RC oscillator make it a viable controller for handheld meters, portable test gear, and remote sensor nodes. The 4 MHz oscillator at 4-6 V keeps active current low while the 14-bit instruction width provides good code density. Brown-out reset and power-on reset protect against battery brown-out events.
Recommended
User Interface and Keypad Scanning
With 33 digital I/O, the PIC16C662T-04E/PT can scan 8x8 matrix keypads and drive multiplexed 7-segment or 14-segment LED displays directly through current-limiting resistors. The CCP module generates the display refresh timing without software overhead, freeing the CPU for application logic. The 7 KB OTP comfortably stores debounce algorithms, lookup tables, and command interpreters for menu-driven UIs.
Recommended
Industrial Sensor Interface Boards
The PIC16C662's USART/SCI module supports RS-232 and RS-485 communication to host PLCs or SCADA nodes, while its 33 I/O lines interface to digital sensors, optocouplers, and 24 V industrial signal levels via external buffers. The extended temperature grade is essential for cabinet-mounted equipment. The on-chip analog comparator allows threshold detection without an external op-amp.
Recommended
Smart Home Edge Controllers
Compact 44-pin TQFP form factor, low cost, and on-chip USART allow the PIC16C662T-04E/PT to serve as a node controller for smart-home subsystems such as lighting dimmers, blind motors, and door/window sensors. Its deterministic 1 us instruction cycle is well-suited to dimmer zero-cross detection and triac firing. For new designs prefer the flash-based PIC16F15344 or PIC16F180 family for modern peripherals and Core Independent Peripherals.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662T-04E/PT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C662-04E/PT | PIC16C662-20E/PT | PIC16C662T-04I/PT | PIC16F747-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Program Memory Type | OTP (7 KB) | OTP (7 KB) | OTP (7 KB) | OTP (7 KB) | Flash (7 KB) |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 20 MHz |
| Temperature Grade | Extended (-40C to +125C) | Extended (-40C to +125C) | Extended (-40C to +125C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) |
| Number of I/O | 33 | 33 | 33 | 33 | 36 |
| ADC | Not present | Not present | Not present | Not present | 8-channel 8-bit |
| RoHS Compliance | Non-compliant | Non-compliant | Non-compliant | Non-compliant | Compliant |
| Lifecycle Status | NRND | NRND | NRND | NRND | Active |
Key Differentiators
- Extended temperature range for industrial and automotive environments (vs PIC16C662T-04I/PT (industrial -40C to +85C))
- Higher maximum clock speed option in same package (vs PIC16C662-20E/PT)
- Reprogrammable flash alternative available for firmware updates (vs PIC16F747-I/PT)
Design Notes
Decouple every Vdd pin with a 100 nF ceramic capacitor placed within 5 mm of the package pin. According to the Microchip PIC16C662 datasheet, the device has three Vdd pins (19, 28, 39) and four Vss pins (8, 18, 29, 38) on the TQFP-44 package; each Vdd must have its own decoupling capacitor and the ground returns must form a low-inductance star or grid. Adding a bulk 10 uF tantalum or aluminum polymer cap near the IC supplies the transient current during peripheral switching.
Keep the OSC1/OSC2 traces short and surround them with a ground guard ring to minimize radiated EMI and stray pickup. For a 4 MHz crystal or resonator, route the traces as a differential pair of less than 10 mm length. Place C1 and C2 (typically 15-33 pF) from each oscillator pin to ground as close as possible to the IC. Per Microchip oscillator design notes, using an external parallel-resonant crystal with a series resistor (Rs 100-330 ohm) prevents overdriving the oscillator at low Vdd.
OTP memory is one-time programmable - firmware errors cannot be corrected after programming. Validate the HEX file against the full production test set in a flash-equivalent PIC16F662 or PIC16F747 socket before committing to the OTP die. Also note that the MCLR pin (pin 44) must never be left floating; tie it through a 10 kohm pull-up to Vdd, with the ICSP programmer diode-isolated, otherwise spurious resets will occur in noisy industrial environments.
The 44-pin TQFP (PT) package has a junction-to-ambient thermal resistance of approximately 50 C/W (still air) per the Microchip package outline. At the maximum 4 MHz clock and 6 V supply, the active current of about 5 mA creates only ~30 mW dissipation, so the junction temperature rise is negligible (<2 C). For high-IO-count designs driving many outputs continuously, calculate total dissipation from I/O sink current and ensure junction stays below 125 C for the extended temperature grade.
Compliance Information
PIC16C662 family is not RoHS compliant per Microchip legacy datasheet notes; uses lead-bearing terminations required by OTP process. Not AEC-Q100 qualified - automotive applications should migrate to PIC16F1939-I/PT or dsPIC33 family. No on-chip EEPROM.
