PIC16C64A-04I/PT - 8-bit OTP MCU, 3.5KB, 33 I/O | Microchip
MPN: PIC16C64A-04I/PT β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.48 | $64.80 |
| 100 | $5.76 | $576.00 |
| 500 | $5.18 | $2,590.00 |
| 1,000 | $4.61 | $4,610.00 |
PIC16C64A-04I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, RAM, and peripherals on one die. Within the broader taxonomy, MCUs belong to microcontrollers, then embedded processors, then semiconductors. The PIC16C family specifically targets cost-sensitive, low-power, deterministic real-time control tasks and is known for its RISC-like 35-instruction set, single-cycle execution at 4 MHz, and Harvard architecture that separates program and data buses. PIC16C64A-04I/PT fits this niche as an intermediate-density device with enhanced I/O and serial communication capability.
Key features of the PIC16C64A-04I/PT include its 33 digital I/O lines distributed across multiple ports, 8-channel 8-bit A/D converter with external reference option, two 8-bit timers plus one 16-bit timer with prescaler, USART for asynchronous and synchronous serial communication, and an 8-bit parallel slave port for external bus interfacing. The OTP memory architecture allows factory or prototype programming, which is cost-effective for low-volume or mature products.
Internally, the device uses a 14-bit instruction word, an 8-bit data path, and a two-stage pipeline, providing predictable single-instruction-cycle latency (250 ns at 4 MHz) for time-critical control loops. The integrated Watchdog Timer with its own on-chip RC oscillator adds fault-recovery capability, and the Power-on Reset (POR) and Brown-out Reset (BOR) circuits simplify power-supply design. The device supports in-circuit serial programming (ICSP) via two pins.
Typical applications include industrial control panels, appliance control boards, automotive body electronics (non-safety), sensor interface modules, and legacy embedded systems that have already been qualified on the PIC16C architecture. The wide 2.5-6.0V supply tolerance allows direct connection to 5V or 3.3V rails, and the 33 I/O count suits systems with multiple digital sensors, keypads, or LED arrays.
When designing with this part, note that the 'I' suffix denotes the industrial temperature range and the 'PT' suffix denotes the 44-pin TQFP package. The 4 MHz speed grade is appropriate for systems that do not need the higher 20 MHz capability. Because this is an OTP device, code is permanently locked after programming; consider PIC16F64 (Flash) or PIC16C65B for reprogrammable variants during development.
This page synthesizes distributor stock levels, parametric comparisons, and practical design notes for the PIC16C64A-04I/PT, providing engineering context beyond the manufacturer datasheet.
Drop-in alternatives for PIC16C64A-04I/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 PIC16C64A-04I/PT (same form factor and footprint) β differing in Package, RoHS Status, Timers, Operating Temperature Range, Program Memory Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F64-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65B-20I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C64A-04E/PT
β Drop-Inβ In Stock
$7.35 / Unit
View Datasheet βPIC16C64A-04I/PQ
β Drop-Inβ In Stock
$6.4 / Unit
View Datasheet βPIC16C64A-04I/P
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$6.1 / Unit
View Datasheet βPIC16C64A-04I/PT Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC |
| Family | PIC16C Series |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM | 128 bytes |
| Data EEPROM | 0 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 250 ns at 4 MHz |
| Supply Voltage (Vdd) | 2.5 V to 6.0 V |
| I/O Pins | 33 |
| Timers | 2 x 8-bit + 1 x 16-bit |
| A/D Converter | 8-channel, 8-bit |
| Communication | USART (SCI), SPI/I2C (SSP) |
| Parallel Slave Port | Yes, 8-bit |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 44-pin TQFP (PT) |
| Mounting Type | Surface Mount |
| Watchdog Timer | Yes (with dedicated RC oscillator) |
| Brown-out Reset | Yes |
| In-Circuit Programming | ICSP, 2-wire |
PIC16C64A-04I/PT Pin Configuration
| Pin 1 | MCLR/Vpp β Master Clear (Reset) input or ICSP programming voltage input |
| Pin 2 | RA0/AN0 β PORTA bit 0 / Analog input channel 0 |
| Pin 3 | RA1/AN1 β PORTA bit 1 / Analog input channel 1 |
| Pin 4 | RA2/AN2 β PORTA bit 2 / Analog input channel 2 |
| Pin 5 | RA3/AN3/Vref β PORTA bit 3 / Analog input channel 3 / ADC voltage reference |
| Pin 6 | RA4/T0CKI β PORTA bit 4 / Timer 0 clock input |
| Pin 7 | RA5/AN4/SS β PORTA bit 5 / Analog input channel 4 / SPI Slave Select |
| Pin 8 | RE0/RD/AN5 β PORTE bit 0 / Parallel Slave Port read / Analog input 5 |
| Pin 9 | RE1/WR/AN6 β PORTE bit 1 / Parallel Slave Port write / Analog input 6 |
| Pin 10 | RE2/CS/AN7 β PORTE bit 2 / Parallel Slave Port chip select / Analog input 7 |
| Pin 11 | Vdd β Positive supply voltage (2.5V to 6.0V) |
| Pin 12 | Vss β Ground reference |
| Pin 13 | OSC1/CLKIN β Oscillator crystal input or external clock input |
| Pin 14 | OSC2/CLKOUT β Oscillator crystal output or 1/4 instruction-clock output |
| Pin 15 | RC0/T1OSO/T1CKI β PORTC bit 0 / Timer 1 oscillator output / Timer 1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 β PORTC bit 1 / Timer 1 oscillator input / Capture-Compare-PWM 2 |
| Pin 17 | RC2/CCP1 β PORTC bit 2 / Capture-Compare-PWM 1 |
| Pin 18 | RC3/SCK/SCL β PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 β PORTD bit 0 / Parallel Slave Port data bit 0 |
| Pin 20 | RD1/PSP1 β PORTD bit 1 / Parallel Slave Port data bit 1 |
| Pin 21 | RD2/PSP2 β PORTD bit 2 / Parallel Slave Port data bit 2 |
| Pin 22 | RD3/PSP3 β PORTD bit 3 / Parallel Slave Port data bit 3 |
| Pin 23 | RC4/SDI/SDA β PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO β PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK β PORTC bit 6 / USART transmit or synchronous clock |
| Pin 26 | RC7/RX/DT β PORTC bit 7 / USART receive or synchronous data |
| Pin 27 | RD4/PSP4 β PORTD bit 4 / Parallel Slave Port data bit 4 |
| Pin 28 | RD5/PSP5 β PORTD bit 5 / Parallel Slave Port data bit 5 |
| Pin 29 | RD6/PSP6 β PORTD bit 6 / Parallel Slave Port data bit 6 |
| Pin 30 | RD7/PSP7 β PORTD bit 7 / Parallel Slave Port data bit 7 |
| Pin 31 | Vss β Ground reference |
| Pin 32 | Vdd β Positive supply voltage (2.5V to 6.0V) |
| Pin 33 | RB0/INT β PORTB bit 0 / External interrupt input |
| Pin 34 | RB1 β PORTB bit 1 |
| Pin 35 | RB2 β PORTB bit 2 |
| Pin 36 | RB3 β PORTB bit 3 |
| Pin 37 | RB4 β PORTB bit 4 |
| Pin 38 | RB5 β PORTB bit 5 |
| Pin 39 | RB6/PGC β PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD β PORTB bit 7 / ICSP data |
| Pin 41 | Vss β Ground reference |
| Pin 42 | Vdd β Positive supply voltage (2.5V to 6.0V) |
| Pin 43 | NC β Not connected (per datasheet) |
| Pin 44 | NC β Not connected (per datasheet) |
Typical Applications
PIC16C64A-04I/PT is suitable for 6 applications: Industrial Control Panels, Appliance Control Boards, Automotive Body Electronics (Non-Safety), Sensor Interface Modules, Legacy Embedded System Sustainment, Educational and Hobbyist Projects.
Industrial Control Panels
The PIC16C64A-04I/PT fits industrial control panels that need 33 digital I/O for keypad scanning, multi-digit 7-segment LED multiplexing, and digital sensor aggregation. Its 2.5-6.0V supply range accepts unregulated 5V rails typical in industrial cabinets, and the industrial -40C to +85C operating range covers most factory-floor enclosures. The 4 MHz / 1 MIPS throughput is more than sufficient for scanning 4x4 keypads (sub-1 ms) and refreshing 8-digit displays (sub-10 ms). The integrated 8-channel 8-bit ADC adds direct temperature, pressure, or potentiometer reading without an external converter, reducing BOM cost.
Recommended
Appliance Control Boards
The PIC16C64A-04I/PT is a strong match for appliance control boards (washing machines, microwave ovens, dishwashers, HVAC thermostats) that need 20-40 I/O for relay drivers, button inputs, and segment displays. The OTP memory prevents accidental firmware modification in the field, which is valuable for regulatory-locked products. The integrated USART supports simple modem or display-module communication, while the parallel slave port lets the MCU act as an I/O expander for a main processor. The wide 2.5-6.0V supply tolerates rectified 5V rails typical in appliances.
Recommended
Automotive Body Electronics (Non-Safety)
For non-safety automotive body modules such as seat controllers, mirror adjusters, interior lighting, or HVAC blend-door actuators, the PIC16C64A-04I/PT's 33 I/O and USART fit the bill. Its 8-channel ADC reads thermistors for temperature-based control, and the 4 MHz performance handles 100 Hz control loops comfortably. Note that for safety-critical automotive applications, you must migrate to AEC-Q100-qualified parts like PIC16F876A-I/SP or PIC18F4520-I/P; the PIC16C64A family is NOT AEC-Q100 qualified. The 5V operation tolerates typical automotive 12V-derived rails after regulation.
Recommended
Sensor Interface Modules
The PIC16C64A-04I/PT's integrated 8-channel 8-bit ADC, 33 digital I/O, and USART make it a fit for sensor-interface modules that aggregate multiple analog sensors (temperature, light, humidity, potentiometer) and forward the data to a host controller. The 2.5-6.0V supply works with 3.3V or 5V sensor rails, and the 4 MHz core processes 8-bit conversions at several kHz per channel. The Watchdog Timer with its own RC oscillator adds fault-recovery to unattended sensor nodes. For modern 10-/12-bit ADC needs, migrate to PIC16F88 or PIC16F1827.
Recommended
Legacy Embedded System Sustainment
For sustaining production of mature products whose firmware is already qualified on the PIC16C64A architecture, the PIC16C64A-04I/PT remains the canonical replacement - it is pin-and-peripheral-compatible with the original PIC16C64A (CERDIP, PLCC) when migrating to surface-mount TQFP. Existing assembly or C code written for the PIC16C64A drops onto the PIC16C64A-04I/PT without modification. The '04' speed grade (4 MHz) matches legacy designs that did not need higher clock. Maintain stock of this NRND part for warranty and service contracts.
Recommended
Educational and Hobbyist Projects
The PIC16C64A-04I/PT, with its 33 I/O, 8-channel ADC, USART, and parallel slave port, is an excellent teaching platform for embedded systems courses. Students can wire up keypads, LEDs, LCDs, and sensors without external multiplexer ICs. The 44-pin TQFP package requires breakout-board soldering, which is good QFP-handling practice. However, because PIC16C64A is OTP, students cannot iterate firmware in-circuit; we recommend PIC16F877A-I/P (40-pin DIP) or PIC16F64-I/PT (44-pin TQFP) for the actual development platform, keeping PIC16C64A-04I/PT for the final OTP-programmed target.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C64A-04I/PT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F64-I/PT | PIC16C65B-20I/PT | PIC16C64A-04E/PT | PIC16C64A-04I/PQ |
|---|---|---|---|---|---|
| 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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB OTP | 3.5 KB Flash | 7.2 KB OTP | 3.5 KB OTP - same | 3.5 KB OTP - same |
| Maximum Clock | 4 MHz | 4 MHz - same | 20 MHz | 4 MHz - same | 4 MHz - same |
| RAM | 128 bytes | 128 bytes - same | 192 bytes | 128 bytes - same | 128 bytes - same |
| I/O Pins | 33 | 33 - same | 33 - same | 33 - same | 33 - same |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C - same | -40C to +85C - same | -40C to +125C (Extended) | -40C to +85C - same |
| Memory Type | OTP (one-time programmable) | Flash (reprogrammable) | OTP (one-time programmable) | OTP - same | OTP - same |
| Migration Path | Original NRND part | Flash drop-in for development | Microchip's recommended newer replacement | Extended-temp variant | Same die, alternative reel code |
Key Differentiators
- Microchip's officially recommended successor in same package (vs PIC16C65B-20I/PT)
- Flash reprogrammability without changing footprint (vs PIC16F64-I/PT)
- Extended temperature range for harsh environments (vs PIC16C64A-04E/PT)
Design Notes
Estimated: The 44-pin TQFP (PT) package has a 0.80 mm lead pitch and 10x10 mm body. Place a 0.1 uF ceramic decoupling capacitor within 3 mm of each Vdd pin (pins 11, 32, 42) to Vss (pins 12, 31, 41), with vias to an inner ground plane. The three Vdd/Vss pairs are NOT internally bonded on the PIC16C64A - each requires its own bypass capacitor. Use a continuous ground plane under the IC with thermal relief spokes only where the design requires rework.
The PIC16C64A is OTP (One-Time Programmable) - code cannot be erased or rewritten after the ICSP programming cycle completes. Verify firmware with a Flash equivalent (PIC16F64-I/PT) on the development bench before committing to OTP programming. OTP programming sets bits permanently; a single bad code lock bit can render the device a brick. Always keep a few pre-programmed PIC16F64-I/PT units as engineering spares for field recovery.
Estimated: The PIC16C64A-04I/PT typically draws 2-15 mA active and < 1 uA in Sleep mode at 5V and 4 MHz. Bulk-decouple Vdd with a 10 uF tantalum or ceramic capacitor near the IC, in addition to the 0.1 uF high-frequency bypass per Vdd pin. The Brown-out Reset (BOR) is factory-trimmed; if the supply rail is slow-rising (RC ramp-up), ensure the BOR re-arm time is accounted for in the firmware startup sequence, or use an external POR IC for slow-ramping supplies.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free (Pb-free) TQFP package. NOT AEC-Q100 qualified - do not use for automotive safety applications. Microchip recommends PIC16C65B for new designs (PIC16C64A is NRND).
