PIC16C64AT-20E/PQ - 8-Bit 20MHz OTP MCU, 3.5KB | Microchip
MPN: PIC16C64AT-20E/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $9.8 | $980.00 |
| 500 | $8.45 | $4,225.00 |
| 1,000 | $7.2 | $7,200.00 |
PIC16C64AT-20E/PQ Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and programmable I/O peripherals. Within the broader taxonomy, the PIC16C64A is an OTP variant of the PIC16C64 baseline - OTP devices are programmed once and cannot be erased, contrasting with UV-erasable EPROM and Flash (PIC16F) siblings. PIC microcontrollers sit in the 8-bit RISC category alongside the 8051 and AVR families, and serve as the lowest-cost general-purpose embedded controllers in the Microchip portfolio.
Key features of the PIC16C64AT-20E/PQ include the Harvard RISC architecture with separate program and data buses, 33 digital I/O lines, a 20MHz internal oscillator input, capture/compare/PWM (CCP) module, USART, 8-channel 8-bit A/D converter, three timers, and an instruction set of 35 single-word instructions. The 'E' suffix designates the extended industrial temperature range of -40C to +125C, and the 'T' suffix denotes Tape & Reel packaging. The device is well suited to industrial control, automotive subsystem, and consumer product applications where cost-sensitive, deterministic 8-bit control is required.
The PIC16C64AT-20E/PQ is built on Microchip's mature CMOS process and uses a 14-bit instruction word with a 12-bit program memory address space, supporting 8K x 14 of addressable program memory. Its Harvard architecture allows simultaneous instruction fetch and data access, enabling most instructions to execute in a single instruction cycle (200ns at 20MHz). Power consumption is optimized through SLEEP mode and a programmable Watchdog Timer, making it suitable for battery-powered or low-duty-cycle embedded designs.
Typical applications include industrial control, automotive body and chassis electronics, consumer appliances, and general-purpose embedded control systems. The 33 I/O pins and integrated peripherals allow the device to replace multiple discrete logic ICs in cost-sensitive designs.
Drop-in alternatives for PIC16C64AT-20E/PQ — 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 PIC16C64AT-20E/PQ (same form factor and footprint) — differing in Package, Core Architecture, Program Memory Size, RoHS Status, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C64A-20E/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C64A-20I/PQ
✅ Drop-In✓ In Stock
$12.2 / Unit
View Datasheet →PIC16C64A-20/PQ
✅ Drop-In✓ In Stock
$5.2 / Unit
View Datasheet →PIC16C64AT-10E/PQ
✅ Drop-In✓ In Stock
$5.2 / Unit
View Datasheet →PIC16C64AT-04/PQ
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →PIC16C64AT-20E/PQ Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC RISC |
| Program Memory | 3.5 KB (2K x 14) OTP |
| RAM | 128 x 8 bytes |
| Maximum Clock Frequency | 20 MHz |
| Operating Voltage | 5 V |
| Number of I/O Pins | 33 |
| Package | 44-pin MQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel |
| Operating Temperature Range | -40C to +125C (E - Extended Industrial) |
| A/D Converter | 8-bit, 8 channels |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Communication Interfaces | USART (SCI), SSP (SPI/I2C) |
| Instruction Set Size | 35 instructions (14-bit word) |
| Architecture | Harvard, RISC |
PIC16C64AT-20E/PQ Pin Configuration
| Pin 1 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC negative reference |
| Pin 2 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC positive reference |
| Pin 3 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 4 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 5 | VSS — Ground |
| Pin 6 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 7 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 8 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 9 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 module |
| Pin 10 | RC2/CCP1 — PORTC bit 2 / CCP1 module (PWM/capture/compare) |
| Pin 11 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 12 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 13 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 14 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 15 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 16 | VSS — Ground |
| Pin 17 | VDD — Positive supply (5V) |
| Pin 18 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 19 | RB1 — PORTB bit 1 |
| Pin 20 | RB2 — PORTB bit 2 |
| Pin 21 | RB3 — PORTB bit 3 |
| Pin 22 | RB4 — PORTB bit 4 |
| Pin 23 | RB5 — PORTB bit 5 |
| Pin 24 | RB6 — PORTB bit 6 |
| Pin 25 | RB7 — PORTB bit 7 |
| Pin 26 | VSS — Ground |
| Pin 27 | VDD — Positive supply (5V) |
| Pin 28 | RD0 — PORTD bit 0 |
| Pin 29 | RD1 — PORTD bit 1 |
| Pin 30 | RD2 — PORTD bit 2 |
| Pin 31 | RD3 — PORTD bit 3 |
| Pin 32 | RD4 — PORTD bit 4 |
| Pin 33 | RD5 — PORTD bit 5 |
| Pin 34 | RD6 — PORTD bit 6 |
| Pin 35 | RD7 — PORTD bit 7 |
| Pin 36 | VSS — Ground |
| Pin 37 | VDD — Positive supply (5V) |
| Pin 38 | RE0/AN5/RD — PORTE bit 0 / Analog input 5 / parallel port read strobe |
| Pin 39 | RE1/AN6/WR — PORTE bit 1 / Analog input 6 / parallel port write strobe |
| Pin 40 | RE2/AN7/CS — PORTE bit 2 / Analog input 7 / parallel port chip select |
| Pin 41 | VSS — Ground |
| Pin 42 | VDD — Positive supply (5V) |
| Pin 43 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 44 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
Typical Applications
PIC16C64AT-20E/PQ is suitable for 6 applications: Industrial Control Systems, Automotive Body Electronics, Consumer Appliance Control, Embedded Sensor Data Acquisition, Motor Control and PWM Drivers, General-Purpose Embedded Control.
Industrial Control Systems
The PIC16C64AT-20E/PQ is well suited to industrial control applications requiring deterministic 8-bit processing at 5V with extended -40C to +125C temperature support. Its 33 digital I/O pins can directly interface with relays, optocouplers, and discrete sensors, while the integrated 8-channel 8-bit A/D converter reads analog signals from transducers, thermistors, and current-sense amplifiers. The 20MHz clock provides 5 MIPS throughput, sufficient for PLC scan loops, motor-start sequencing, and PID control at low update rates. Compared to discrete logic ICs, the PIC16C64A replaces dozens of components with a single programmable device, reducing BOM cost and PCB area in factory automation equipment.
Recommended
Automotive Body Electronics
The PIC16C64AT-20E/PQ is commonly deployed in non-safety automotive body and chassis subsystems such as interior lighting controllers, seat-position memories, climate-control panels, and door-zone modules. Its extended industrial temperature range of -40C to +125C accommodates underbody and engine-bay thermal stress, while its 5V operation matches automotive battery bus tolerance when paired with regulators. The CCP module and PWM timers drive LED dimming and motor-position servo loops, and the USART supports LIN-bus or K-line communication with the body controller. The 3.5KB OTP memory is sized appropriately for body-electronics firmware that rarely changes during production.
Recommended
Consumer Appliance Control
The PIC16C64AT-20E/PQ is well matched to white-goods and small-appliance control boards including washing-machine timers, microwave-oven keypads, dishwasher cycle controllers, and HVAC thermostat logic. Its 33 I/O drive scan and control LED or 7-segment displays while the 8-bit A/D reads temperature, humidity, and water-level sensors. The OTP memory prevents firmware reverse-engineering and protects manufacturer IP, while the small 44-pin MQFP footprint suits compact consumer-appliance PCBs. The 20MHz instruction rate enables smooth sensor sampling and keypad debounce without external logic, reducing BOM cost by approximately 30-50% versus discrete 8051-based designs.
Recommended
Embedded Sensor Data Acquisition
The PIC16C64AT-20E/PQ serves as a low-cost sensor hub in industrial telemetry, building-automation, and remote-monitoring applications. The integrated 8-channel 8-bit A/D converter multiplexes multiple analog sensors (temperature, pressure, light, gas) into a single MCU, while the USART, SPI, and I2C peripherals forward data to higher-level controllers via wired links. The 5V core and SLEEP-mode low-power operation support battery-powered sensor nodes that wake periodically to take readings. The 128-byte RAM accommodates small FIFO buffers for protocol framing without external memory.
Recommended
Motor Control and PWM Drivers
The PIC16C64AT-20E/PQ's CCP module and three timers support brushed DC, stepper, and small brushless motor control via PWM outputs, capture inputs, and quadrant detection. Its 20MHz clock drives PWM frequencies up to 78 kHz (8-bit Timer2 PWM at 1:1 prescaler), well above the 20 kHz threshold needed to push motor whine above audible range. The 33 I/O pins handle direction logic, H-bridge enable, encoder feedback, and current-fault interrupts. For low-cost fan, pump, and small-motor applications the PIC16C64A eliminates dedicated motor-control ICs, while its -40C to +125C temperature grade suits underhood and outdoor environments.
Recommended
General-Purpose Embedded Control
The PIC16C64AT-20E/PQ is a versatile general-purpose 8-bit MCU for cost-sensitive embedded products where production volume justifies OTP programming. Designers can implement UART bridges, I/O expanders, keypad scanners, LED-matrix controllers, and protocol converters with a single chip. The 35-instruction RISC core is straightforward to program in assembly or C (using MPLAB XC8), enabling fast firmware development. With 33 GPIO, three timers, and integrated peripherals, the device handles mid-complexity embedded tasks without external glue logic, making it a strong fit for OEM industrial and commercial products.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C64AT-20E/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C64A-20E/PQ | PIC16C64A-20I/PQ | PIC16C64A-20/PQ | PIC16C64AT-10E/PQ | PIC16C64AT-04/PQ |
|---|---|---|---|---|---|---|
| Package | 44-pin MQFP (10x10 mm) | 44-pin MQFP (10x10 mm) - same | 44-pin MQFP (10x10 mm) - same | 44-pin MQFP (10x10 mm) - same | 44-pin MQFP (10x10 mm) - same | 44-pin MQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 4 MHz |
| Operating Temperature Range | -40C to +125C (Extended Industrial) | -40C to +125C (Extended Industrial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +125C (Extended Industrial) | 0C to +70C (Commercial) |
| Packaging | Tape & Reel | Tray | Tray | Tray | Tape & Reel | Tape & Reel |
| Program Memory | 3.5 KB OTP (2K x 14) | 3.5 KB OTP (2K x 14) | 3.5 KB OTP (2K x 14) | 3.5 KB OTP (2K x 14) | 3.5 KB OTP (2K x 14) | 3.5 KB OTP (2K x 14) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| A/D Converter | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels |
| Communication Interfaces | USART, SPI, I2C | USART, SPI, I2C | USART, SPI, I2C | USART, SPI, I2C | USART, SPI, I2C | USART, SPI, I2C |
Key Differentiators
- Extended industrial temperature range -40C to +125C (vs PIC16C64A-20/PQ)
- Tape & Reel packaging for high-volume automated assembly (vs PIC16C64A-20E/PQ)
- Full 20MHz instruction rate for time-critical control (vs PIC16C64AT-04/PQ)
- OTP memory prevents firmware reverse-engineering (vs PIC16F877A-I/PQ)
Design Notes
The PIC16C64AT-20E/PQ operates from a single 5V supply (4.0V to 6.0V absolute maximum). Place 100nF decoupling capacitors as close as possible to each VDD pin (pins 17, 27, 37, 42). For battery or low-noise applications, add a 10uF bulk capacitor at the supply input. Estimated: at 20MHz clock and full I/O activity, the device draws approximately 10-15mA; SLEEP mode reduces this to under 1uA per the PIC16C64A datasheet.
The MQFP-44 package requires a 10x10 mm land pattern with thermal pad exposed for heat dissipation. Maintain 0.8mm trace clearance from package edges and avoid running high-current traces under the IC. The analog inputs (RA0-RA5, RE0-RE2) should be routed away from switching signals to minimize ADC noise coupling; a grounded guard ring around analog traces is recommended per the PIC16C64A datasheet section on ADC design.
OTP (One-Time Programmable) memory cannot be erased or rewritten - ensure firmware is fully validated on an EPROM or Flash equivalent (such as PIC16F64A or PIC16F74 with windowed package) before programming OTP production parts. Per the PIC16C64A datasheet, configuration bits must be set carefully to avoid code-protect lockout in production. The 20MHz clock input requires a stable oscillator with a series resistor if using a crystal above 10MHz to dampen harmonic oscillation.
Estimated: At -40C to +125C ambient with full I/O drive (33 pins sourcing 20mA each), internal dissipation can reach 200-400mW. The MQFP-44 package thermal resistance theta_JA is approximately 50 C/W on a 4-layer JEDEC test PCB; ensure ambient temperature plus dissipation stays below the +125C junction limit. For sustained high-current GPIO loads, derate to 10mA per pin per Microchip's PIC16C64A datasheet DC characteristics.
Compliance Information
PIC16C64AT-20E/PQ is an obsolete legacy product predating many modern compliance requirements. The MQFP-44 package historically used tin-lead (SnPb) finish; RoHS-compliant versions were produced under specific order codes. Not AEC-Q100 qualified; consult Microchip automotive-grade PIC16F variants for AEC-Q100 needs.
