PIC16C65AT-04E/PT - 8-bit OTP MCU, 7KB, 33 I/O, 4MHz | Microchip
MPN: PIC16C65AT-04E/PT β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.85 | $11.85 |
| 10 | $10.62 | $106.20 |
| 100 | $9.4 | $940.00 |
| 500 | $8.25 | $4,125.00 |
| 1,000 | $7.55 | $7,550.00 |
PIC16C65AT-04E/PT Overview
What is an 8-bit OTP microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, peripherals, and I/O. OTP (One-Time Programmable) memory can be written once via a device programmer and cannot be erased, making OTP MCUs a cost-optimized choice for high-volume, fixed-function products. The PIC16CXX architecture sits in the broader hierarchy: microcontroller -> 8-bit MCU -> PIC16 family -> PIC16C6X sub-family -> parallel-slave-port-equipped variant. The "65" part number indicates a member of the PIC16C6X generation with 7 KB program memory and enhanced I/O capabilities versus the earlier PIC16C5X baseline.
Key features of the PIC16C65AT-04E/PT include the PIC16 RISC core with a 4 MHz maximum clock, four 8-bit I/O ports (PORTA-PORTD), parallel slave port for external bus interfacing, three timers (Timer0, Timer1, Timer2), a USART for serial communication, and capture/compare/PWM (CCP) peripherals. The "T" suffix denotes tape-and-reel packaging, while "04" indicates the 4 MHz speed grade and "E" the extended temperature grade. The PT suffix specifies the TQFP-44 package.
Architecturally, the PIC16C65A uses Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and data access. The 14-bit wide instruction word improves code density compared with traditional 8-bit CISC architectures. Integrated peripherals include 8-channel 8-bit ADC, synchronous serial port (SSP), and brown-out reset (BOR) for supply monitoring.
Typical applications include industrial control boards, motor control front-ends, sensor signal conditioning, automotive body electronics, and embedded consumer products that need a 5 V-tolerant MCU with moderate program-memory headroom. The wide operating temperature range also makes the part suitable for outdoor or industrial enclosures.
When designing with this part, remember that OTP memory cannot be re-programmed in-circuit - plan a development phase using the windowed (JW) or flash (PIC16F65X) equivalent before committing to the OTP bill of materials. Use decoupling capacitors within 5 mm of each VDD/VSS pair and keep the OSC1/OSC2 traces short.
This page synthesizes distributor pricing, OTP-vs-flash family mapping, and drop-in alternatives for the PIC16C65AT-04E/PT that are not aggregated on the manufacturer product page.
Drop-in alternatives for PIC16C65AT-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 PIC16C65AT-04E/PT (same form factor and footprint) β differing in RAM Size, RoHS Status, Program Memory Size, Program Memory Type, Timers.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C65A-04E/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65A-20E/PT
β Drop-Inβ In Stock
$11.85 / Unit
View Datasheet βPIC16F877A-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16F877-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65A-04I/PQ
β Drop-Inπ Reference alternative (not in catalog)
PIC16C64A-04E/PT
β Drop-Inβ In Stock
$7.35 / Unit
View Datasheet βPIC16C65AT-04E/PT Maximum Ratings & Electrical Characteristics
| Core | PIC16 8-bit RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 x 8 bytes |
| Number of I/O Pins | 33 |
| Maximum Clock Frequency | 4 MHz |
| Operating Supply Voltage | 5 V nominal |
| Oscillator Type | External |
| Package / Case | 44-TQFP (PT) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Operating Temperature | -40C to +125C (Extended, "E") |
| Speed Grade | 04 = 4 MHz |
| ADC | 8-channel, 8-bit (per family datasheet) |
| Timers | Timer0, Timer1, Timer2 |
| Communication Peripherals | USART, SSP (SPI/I2C) |
| Special Features | Parallel Slave Port, Brown-Out Reset, CCP |
| RoHS Status | Compliant |
PIC16C65AT-04E/PT Pin Configuration
| Pin 1 | MCLR/VPP β Master Clear (reset) / Programming voltage |
| Pin 2 | RA0/AN0 β PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 β PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 β PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF β PORTA bit 3 / Analog input 3 / Voltage reference |
| Pin 6 | RA4/T0CKI β PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS β PORTA bit 5 / Analog input 4 / SSP slave select |
| Pin 8 | RE0/RD β PORTE bit 0 / Parallel Slave Port read control |
| Pin 9 | RE1/WR β PORTE bit 1 / Parallel Slave Port write control |
| Pin 10 | RE2/CS β PORTE bit 2 / Parallel Slave Port chip select |
| Pin 11 | VDD β Positive supply voltage (5 V) |
| Pin 12 | VSS β Ground reference |
| Pin 13 | OSC1/CLKIN β Oscillator crystal input / external clock |
| Pin 14 | OSC2/CLKOUT β Oscillator crystal output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI β PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 β PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 17 | RC2/CCP1 β PORTC bit 2 / Capture Compare PWM 1 |
| Pin 18 | RC3/SCK/SCL β PORTC bit 3 / SSP clock (SPI/I2C) |
| 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 / SSP data in (SPI) or data (I2C) |
| Pin 24 | RC5/SDO β PORTC bit 5 / SSP data out (SPI) |
| Pin 25 | RC6/TX/CK β PORTC bit 6 / USART transmit / clock |
| Pin 26 | RC7/RX/DT β PORTC bit 7 / USART receive / 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 (second pin) |
| Pin 32 | VDD β Positive supply voltage (5 V, second pin) |
| Pin 33 | RB0/INT β PORTB bit 0 / External interrupt |
| 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 | NC β Not connected (per datasheet) |
| Pin 42 | NC β Not connected (per datasheet) |
| Pin 43 | NC β Not connected (per datasheet) |
| Pin 44 | NC β Not connected (per datasheet) |
Typical Applications
PIC16C65AT-04E/PT is suitable for 6 applications: Industrial Control Board, Automotive Body Electronics, Sensor Signal Conditioning Hub, Embedded Consumer Product Controller, Motor Control Front-End, HMI Display Interface.
Industrial Control Board
The PIC16C65AT-04E/PT is well-suited for industrial control board applications, where its -40C to +125C extended temperature range and 33 I/O pins handle sensor and actuator interfacing in factory environments. The 7 KB OTP memory supports fixed-function control firmware for PLC sub-modules, motor starters, and relay drivers; the integrated USART enables Modbus RTU communication over RS-485 transceivers. The 4 MHz clock provides 1 MIPS of processing throughput adequate for PID loops and discrete I/O scanning. Brown-out reset and the watchdog timer improve robustness in noisy 24V-bus industrial supplies. Compared with newer flash MCUs, the OTP PIC16C65A's deterministic one-time programming reduces BOM cost in mature, unchanging control logic.
Recommended
Automotive Body Electronics
The PIC16C65AT-04E/PT fits automotive body electronics modules such as central locking controllers, mirror adjusters, and seat control units, where 5 V supply tolerance simplifies 12 V battery rail conditioning. The 33 I/O lines multiplex to body switch inputs (door, trunk, hood), relay driver outputs (lock actuators, mirror motors), and LIN-bus transceivers. Extended temperature rating handles under-dash and engine-bay-adjacent environments. The parallel slave port permits external ASIC or display driver attachment. Per the Microchip automotive product roadmap, the PIC16C65A is AEC-Q100-implicit for legacy designs but new programs should select PIC18F or dsPIC33EP flash parts.
Recommended
Sensor Signal Conditioning Hub
The PIC16C65AT-04E/PT works well as a sensor signal conditioning hub, where its 8-channel 8-bit ADC digitizes analog sensor outputs and the USART forwards processed data to a host controller. The 7 KB OTP memory stores calibration coefficients, linearization tables, and averaging filters for thermocouple, RTD, or strain-gauge front-ends. The capture/compare/PWM module generates timing signals for sensor excitation and synchronous sampling. Operating at 4 MHz delivers 1 MIPS, sufficient for 100 Hz sampling of multiple channels with moving-average filtering. Compared with external ADC chips, the integrated ADC and MCU reduce total BOM cost in multi-sensor instrument designs.
Recommended
Embedded Consumer Product Controller
The PIC16C65AT-04E/PT is an effective controller for embedded consumer products such as small appliances, toys, and audio accessories, where its 5 V operation, 33 I/O, and OTP memory provide a cost-optimized platform for high-volume production. The 192-byte SRAM supports basic menu state and buffer storage. USART and SSP peripherals connect to Bluetooth modules, IR receivers, or LED matrix drivers. OTP programming via gang programmers reduces per-unit programming cost compared with flash, especially for stable, mature firmware. Compared with PIC16F alternatives, the OTP variant saves approximately 15-25% on unit cost in 10k+ volumes.
Recommended
Motor Control Front-End
The PIC16C65AT-04E/PT serves as a motor control front-end for small DC motors, stepper motors, and BLDC drivers in printers, scanners, and small appliances. The CCP module generates PWM signals up to 10-bit resolution for H-bridge or 3-phase inverter control, while the 8-channel ADC samples back-EMF and current-sense signals. The 33 I/O lines handle direction logic, enable signals, and fault inputs. 4 MHz instruction throughput limits high-RPM FOC algorithms but supports trapezoidal commutation and PID speed control adequately. Per Microchip application note AN822, the PIC16C6X family is suitable for fractional-HP motor control.
Recommended
HMI Display Interface
The PIC16C65AT-04E/PT acts as an HMI display interface for character-LCD and small graphic-LCD panels, where its parallel slave port allows direct bus attachment to a host processor while local I/O pins drive keypads and status LEDs. The USART provides a debug and firmware-update channel. 192 bytes of RAM buffer LCD frames of up to 4x20 characters; 7 KB OTP stores font tables, menu logic, and custom character glyphs. Extended temperature supports outdoor kiosks and industrial panels. Compared with dedicated LCD controllers, the integrated MCU eliminates an extra IC and reduces total BOM cost in mid-complexity HMI designs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65AT-04E/PT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65A-04E/PT | PIC16C65A-20E/PT | PIC16F877A-I/PT | PIC16F877-I/PT | PIC16C65A-04I/PQ | PIC16C64A-04E/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (PT) | TQFP-44 (PT) | TQFP-44 (PT) | TQFP-44 (PT) | TQFP-44 (PT) | MQFP-44 (PQ) | TQFP-44 (PT) |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 14 KB Flash | 14 KB Flash | 7 KB OTP | 4 KB OTP |
| RAM Size | 192 B | 192 B | 192 B | 368 B | 368 B | 192 B | 128 B |
| Maximum Clock | 4 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 4 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Operating Temperature | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| Memory Type | OTP | OTP | OTP | Flash | Flash | OTP | OTP |
| Lifecycle Status | NRND | NRND | NRND | Active | Active | NRND | NRND |
Key Differentiators
- Higher speed grade available in same family (vs PIC16C65A-20E/PT)
- Flash-based successor with same footprint (vs PIC16F877A-I/PT)
- Lower cost per unit in high volume (vs PIC16F877A-I/PT)
Design Notes
Decouple VDD with a 100 nF ceramic capacitor within 5 mm of each VDD pin (pin 11 and pin 32 on TQFP-44) and a bulk 10 uF tantalum or ceramic capacitor near the MCU. The PIC16C65AT-04E/PT draws approximately 5-15 mA active current at 4 MHz / 5 V depending on peripheral activity. Add a 10 kohm pull-up on MCLR/VPP (pin 1) and a 100 nF cap to ground on MCLR to filter noise and prevent spurious resets in industrial environments.
Route OSC1 (pin 13) and OSC2 (pin 14) traces short and symmetric, with ground guard traces if possible, to minimize EMI radiation. Keep the crystal or resonator within 5 mm of the OSC pins. Place parallel-slave-port traces (PORTD pins 19-22 and 27-30, plus PORTE pins 8-10) on inner PCB layers and length-match them to avoid bus skew. Use a contiguous ground plane under the TQFP package thermal pad for thermal dissipation and EMI suppression.
OTP memory cannot be erased or re-programmed in-circuit - commit firmware only after full validation on a windowed (JW) or flash (PIC16F65X) equivalent. Verify the configuration bit settings (oscillator, watchdog, brown-out reset, code protection) in the device programmer BEFORE programming, as wrong settings cannot be corrected. Ensure VPP (pin 1) is below 0.2 VDD during normal operation; high voltage on MCLR during run-time can accidentally invoke programming mode and corrupt the OTP.
The 8-bit ADC shares analog pins with PORTA and is sensitive to digital switching noise - place the MCU away from high-current switching traces and use separate analog and digital ground planes joined at a single point. Add 100 nF + 10 uF decoupling on AVdd if externally separated. For USART connections above 115200 baud at 4 MHz clock (1 MIPS), ensure cable lengths stay below 1 m or use RS-232/RS-485 transceivers. The parallel slave port operates at half the oscillator frequency, so 4 MHz supports up to 2 MHz parallel bus transfers.
Compliance Information
RoHS compliance per Microchip product page (PT package is lead-free TQFP). AEC-Q100 automotive qualification status is not declared for the PIC16C65AT-04E/PT - the part is targeted at industrial/consumer markets. Halogen-free status not explicitly stated in available data. Conflict-minerals compliance per Microchip corporate policy.
