PIC16C662-04E/PT - 8-bit OTP MCU 7KB Flash 33 I/O 4MHz | Microchip
MPN: PIC16C662-04E/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.95 | $9.95 |
| 10 | $8.96 | $89.60 |
| 100 | $7.46 | $746.00 |
| 500 | $6.71 | $3,355.00 |
| 1,000 | $5.97 | $5,970.00 |
PIC16C662-04E/PT Overview
What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a class of MCU whose program memory can be written only once after manufacture, using an external programmer. OTP MCUs occupy the middle ground between mask-ROM devices (lowest cost, programmed at the fab) and Flash MCUs (re-programmable in-circuit). They are common in cost-sensitive, high-volume embedded products where firmware is final and field updates are not required. In the broader taxonomy, an 8-bit OTP MCU belongs to the microcontroller family, which is itself a sub-category of microprocessors and embedded processors within the semiconductor hierarchy.
Key features of the PIC16C662-04E/PT include 192 bytes of general-purpose data RAM, a 14-bit instruction word, an integrated timer/counter peripheral set, and a 4 MHz oscillator ceiling. The 33 I/O pins are arranged on Port A, Port B, Port C, Port D, and Port E, supporting digital I/O and select peripheral functions. The '04' speed suffix indicates the 4 MHz maximum operating frequency, while the 'E' suffix designates the Enhanced (-40C to +125C) operating temperature range, making the part suitable for extended industrial environments.
From a technical-architecture standpoint, the PIC16C662-04E/PT employs a RISC instruction set with a fixed 14-bit instruction width and an 8-bit data path. The Harvard-style dual-bus architecture separates program and data memory access, allowing instruction fetch and data read to occur in parallel over the same instruction cycle - a feature that historically gave PIC MCUs their deterministic interrupt latency and tight C/MIPS ratio. The device integrates brown-out reset, watchdog timer, and power-on reset hardware to simplify system bring-up.
Typical applications include industrial control logic, appliance controllers, automotive body electronics subsystems, low-end sensor-conditioning front-ends, embedded consumer devices, and educational development platforms where deterministic 8-bit processing is sufficient. The wide -40C to +125C operating range also makes it appropriate for outdoor and automotive under-hood modules when paired with adequate thermal management.
When designing with this part, ensure the OTP memory budget aligns with code size expectations - because OTP cannot be erased, firmware bugs discovered late in production cannot be patched at the IC level and must be addressed via board-level rework or a mask-ROM spin. Always validate the 4 MHz instruction-rate ceiling against interrupt service routine latency budgets in time-critical control loops.
This page synthesizes distributor availability, parametric drop-in alternatives in the TQFP-44 footprint, and practical design considerations that go beyond the manufacturer datasheet - giving engineers a single reference for procurement, replacement, and implementation decisions.
Drop-in alternatives for PIC16C662-04E/PT — 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 PIC16C662-04E/PT (same form factor and footprint) — differing in Program Memory Size, Core Architecture, Timers, Program Memory Type, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F914-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F747-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C66-04E/SP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.24 / Unit
View Datasheet →PIC16C65BT-04I/PT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.1 / Unit
View Datasheet →PIC16C64A-04I/PT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.61 / Unit
View Datasheet →PIC16C662-04E/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC Harvard RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 192 bytes |
| Instruction Word Width | 14 bits |
| Maximum Clock Frequency | 4 MHz |
| I/O Pins | 33 |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Operating Temperature Range | -40 C to +125 C (Enhanced 'E' grade) |
| Package | 44-pin TQFP (PT) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| Speed Grade Suffix | 04 = 4 MHz |
| Peripherals | Timers, Watchdog Timer, Brown-out Reset, POR |
PIC16C662-04E/PT Pin Configuration
| Pin 1 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Pin 2 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Pin 3 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Pin 4 | RA3/AN3/VREF+ — Port A bit 3 / analog input 3 / VREF+ |
| Pin 5 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 6 | RA5/AN4/SS — Port A bit 5 / analog input 4 / SPI slave select |
| Pin 7 | RA6/OSC2/CLKOUT — Port A bit 6 / oscillator output / clock out |
| Pin 8 | RA7/OSC1/CLKIN — Port A bit 7 / oscillator input / clock in |
| Pin 9 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | RB0/INT — Port B bit 0 / external interrupt |
| Pin 13 | RB1 — Port B bit 1 |
| Pin 14 | RB2 — Port B bit 2 |
| Pin 15 | RB3 — Port B bit 3 |
| Pin 16 | RB4 — Port B bit 4 |
| Pin 17 | RB5 — Port B bit 5 |
| Pin 18 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 19 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 23 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| Pin 24 | RC2/CCP1 — Port C bit 2 / CCP1 |
| Pin 25 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 26 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 27 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 28 | RC6/TX/CK — Port C bit 6 / UART TX / clock |
| Pin 29 | RC7/RX/DT — Port C bit 7 / UART RX / data |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RD0 — Port D bit 0 |
| Pin 33 | RD1 — Port D bit 1 |
| Pin 34 | RD2 — Port D bit 2 |
| Pin 35 | RD3 — Port D bit 3 |
| Pin 36 | RD4 — Port D bit 4 |
| Pin 37 | RD5 — Port D bit 5 |
| Pin 38 | RD6 — Port D bit 6 |
| Pin 39 | RD7 — Port D bit 7 |
| Pin 40 | RE0/RD — Port E bit 0 / read strobe (parallel slave port) |
| Pin 41 | RE1/WR — Port E bit 1 / write strobe (parallel slave port) |
| Pin 42 | RE2/CS — Port E bit 2 / chip select (parallel slave port) |
| Pin 43 | VSS — Ground reference |
| Pin 44 | VDD — Positive supply voltage |
Typical Applications
PIC16C662-04E/PT is suitable for 6 applications: Industrial Appliance Controllers, Automotive Body Electronics, Consumer Embedded Devices, Sensor Conditioning Front-Ends, Educational Development Platforms, Low-End LED Display Controllers.
Industrial Appliance Controllers
The PIC16C662-04E/PT's 7 KB OTP memory and 192 bytes of RAM are well-matched to washing-machine, dishwasher, and microwave-oven controller boards where the firmware is finalized at production ramp and per-unit cost is the dominant design driver. Its 33 I/O pins directly drive relay banks, seven-segment displays, keypad matrices, and triac gate interfaces without external glue logic. The -40 C to +125 C enhanced temperature range permits placement near heating elements, motors, and switch-mode power supply heat sinks. Designers benefit from the deterministic PIC Harvard architecture - each instruction executes in a fixed 1 microsecond cycle at 4 MHz, simplifying timing analysis for TRIAC zero-crossing routines and motor PWM loops. Compared with newer Flash MCUs, the OTP cost advantage compounds in high-volume appliance SKUs.
Recommended
Automotive Body Electronics
The PIC16C662-04E/PT's -40 C to +125 C enhanced operating range qualifies it for under-dash automotive body modules such as seat controllers, mirror adjusters, and HVAC damper drivers. Its 33 I/O lines accept multiple LIN-bus-capable UART channels, PWM fan outputs, and switch-sensing inputs within a single IC. The 4 MHz instruction rate delivers deterministic response for body-control tasks where latency variation would cause user-perceptible lag. OTP memory prevents firmware tampering in the field - an important consideration for OEM warranty and security postures. Designers should still add external ESD protection (TVS arrays) on the I/O lines because the bare MCU ESD rating is not automotive-grade. Compared with newer PIC16F variants, the OTP cost advantage is significant at automotive-tier volumes.
Recommended
Consumer Embedded Devices
For remote controls, small kitchen gadgets, toys, and educational kits, the PIC16C662-04E/PT provides a sufficient 7 KB of code space for state-machine firmware, I/O scanning, and IR or RF protocol encoding, while its 33 I/O pins easily cover key-matrix inputs, LED drivers, and piezo-buzzer outputs. The 3.0 V to 5.5 V supply range accepts two AA cells in series or a USB-derived 5 V rail directly. The OTP cost model is ideal for SKUs with shipping volumes in the hundreds of thousands - per-piece savings compound quickly over a 2-3 year product lifetime. Engineers commonly prototype on the Flash-based PIC16F914-I/PT sibling, then port the validated firmware to the PIC16C662-04E/PT for production programming.
Recommended
Sensor Conditioning Front-Ends
The PIC16C662-04E/PT serves as a low-cost digital front-end for analog sensor clusters - thermistors, photocells, and simple 4-20 mA loop transmitters - where the MCU performs linearization, threshold detection, and digital output formatting. Its 192 bytes of RAM easily hold calibration constants and a moving-average filter buffer, while the 33 I/O pins accept multiple ADC-monitored analog channels via external muxing. The deterministic 1 microsecond instruction cycle at 4 MHz simplifies implementation of sigma-delta or dual-slope conversion timing. The OTP memory model is advantageous when sensor calibration is locked at end-of-line programming and must never drift in the field.
Recommended
Educational Development Platforms
Universities, technical schools, and hobbyist labs historically standardize on PIC16C-series OTP and Flash MCUs for teaching embedded programming fundamentals. The PIC16C662-04E/PT, while NRND, remains in pedagogical use because its 14-bit instruction set, 33 I/O pins, and 4 MHz execution rate are sufficient to demonstrate timers, interrupts, UART, and I/O port manipulation without overwhelming a student. The TQFP-44 package on breakout boards exposes all pins for lab measurements. Educators often pair it with a PICkit 3 programmer targeting the Flash-based PIC16F914-I/PT for code development, then burning final hex into the PIC16C662-04E/PT to teach the OTP programming workflow.
Recommended
Low-End LED Display Controllers
Signage, scoreboards, and small-format scrolling-LED modules leverage the PIC16C662-04E/PT's 33 I/O pins to drive row/column multiplexed LED matrices directly, with the 4 MHz instruction rate providing enough bandwidth to refresh 8x32 or 16x16 panels without visible flicker. The 7 KB of OTP holds font tables, animation state machines, and serial command parsers. The 192 bytes of RAM accommodate frame buffers for short messages. The -40 C to +125 C range permits outdoor enclosure deployment behind thermally managed fascia. Because display content rarely changes after deployment, OTP memory is an appropriate and cost-effective choice.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C662-04E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F914-I/PT | PIC16F747-I/PT | PIC16C66-04E/SP | PIC16C65BT-04I/PT | PIC16C64A-04I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Program Memory Type | OTP | Flash | Flash | OTP | OTP | OTP |
| Program Memory Size | 7 KB | 7-14 KB | 7 KB | 7-14 KB | 7 KB | 7 KB |
| Data RAM | 192 bytes | 192-336 bytes | 192 bytes | 192-368 bytes | 192 bytes | 192 bytes |
| Maximum Clock Frequency | 4 MHz | 20 MHz | 20 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 33 | 36 | 36 | 33 | 33 | 33 |
| Operating Temperature | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C |
| ICSP Debug Support | Limited (OTP restricts re-programming) | Full ICSP debug | Full ICSP debug | Limited (OTP) | Limited (OTP) | Limited (OTP) |
Key Differentiators
- Lowest unit cost in the TQFP-44 PIC16C6x family at high volume (vs PIC16F914-I/PT)
- Enhanced -40 C to +125 C temperature grade in an OTP MCU (vs PIC16C65BT-04I/PT)
- OTP memory prevents firmware tampering and field updates (vs PIC16F747-I/PT)
Design Notes
OTP memory cannot be erased or rewritten. Confirm the final firmware build - including bootloader, calibration tables, and application code - is byte-stable and validated on a Flash-based PIC16F sibling (PIC16F914-I/PT or PIC16F747-I/PT) before committing the production OTP programming file. A single bug discovered after OTP programming forces board-level rework or part scrapping.
Estimated - at maximum clock (4 MHz) and 5.5 V supply with all 33 I/O pins toggling, the PIC16C662-04E/PT supply current is on the order of 5-10 mA typical. Place 100 nF decoupling capacitors as close as possible to every VDD/VSS pin pair (the TQFP-44 pinout shows 4 VDD/VSS pairs) and add a 10 uF bulk capacitor at the regulator output to suppress switching transients.
The TQFP-44 package has a 0.8 mm lead pitch; route all signals on outer layers only and avoid vias-in-pad unless the assembly house specifically supports it. Keep the MCLR/VPP trace short and surround it with a ground guard ring if the board is exposed to ESD-prone user touchpoints, since MCLR is a high-impedance input sensitive to noise-induced resets.
The 4 MHz oscillator pins (OSC1/OSC2, pins 7/8) should be surrounded by a ground pour and kept away from high-current switching traces such as relay drivers. If using an external crystal, place the load capacitors within 5 mm of the oscillator pins; if using an external clock source, ensure the signal has a clean 50% duty cycle to avoid asymmetric instruction timing.
Compliance Information
RoHS/REACH compliance status not explicitly stated in the verified web data for the PIC16C662-04E/PT. Engineers must confirm directly with Microchip or the distributor before designing into RoHS-bound end products. The part was originally launched prior to widespread RoHS enforcement and historically shipped in lead-containing TQFP packages; modern Microchip production runs may include lead-free finish options - verify per lot.