PIC16C65AT-04E/L - 8-Bit 4MHz OTP MCU 7KB 44-PLCC | Microchip
MPN: PIC16C65AT-04E/L β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.4 | $8.40 |
| 10 | $7.55 | $75.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.2 | $3,100.00 |
| 1,000 | $5.75 | $5,750.00 |
PIC16C65AT-04E/L Overview
What is an 8-bit OTP microcontroller? An 8-bit microcontroller is a single-chip computer with an 8-bit data path, ALU, and registers, optimized for embedded control tasks such as motor driving, sensor reading, and human-machine interface. OTP (One-Time-Programmable) memory is a non-volatile EPROM-based program store that can be written once during production programming, distinguishing it from Flash or EEPROM-based MCUs. The PIC16C6X family belongs to the broader category of microcontrollers -> embedded microcontrollers -> RISC microcontrollers -> CMOS 8-bit microcontrollers within the semiconductor hierarchy. This positions the PIC16C65AT-04E/L as a mature, automotive-grade-temperature controller for cost-sensitive embedded designs.
Key features include 33 digital I/O pins, an external oscillator interface, a 14-bit instruction word architecture (Harvard bus), and a wide operating voltage range of 4V to 6V. The "E" temperature suffix denotes the extended automotive grade, supporting -40C to +125C junction temperatures. The 4MHz maximum operating frequency (suffix "04") makes the part suitable for instruction cycle times down to 250 ns, with 35 single-word instructions, of which all execute in a single instruction cycle except program branches (two cycles).
Architecturally, the PIC16C65AT-04E/L uses a fully-static CMOS RISC core with separate program and data buses (Harvard architecture), enabling simultaneous instruction fetch and operand access. On-chip peripherals documented for the PIC16C6X family include timers, a USART, capture/compare/PWM modules, an 8-bit ADC on selected variants, and a watchdog timer, all configurable via special-function registers.
Typical applications include industrial automation controllers, automotive body electronics, white-goods user interfaces, and consumer appliance control boards. The combination of OTP memory, automotive temperature grade, and PLCC package supports through-hole-friendly socketed prototyping as well as SMT production assembly. Pin-compatibility with other PIC16C6X devices allows PCB reuse across product variants differing only in program memory size or peripheral mix.
Designers should evaluate whether OTP, Flash-based PIC16F, or PIC18 alternatives better match their reprogrammability and supply-chain needs, since OTP parts cannot be re-programmed after initial device programming. The 44-PLCC package is recommended only when socketed field replacement or hand-rework is required; for new high-volume designs, drop-in PLCC-to-QFP migration paths exist within the Microchip portfolio.
This page synthesizes verified distributor pricing, same-brand drop-in PIC16C6X alternatives, parametric comparison, and practical OTP-MCU design notes that complement the Microchip datasheet.
Drop-in alternatives for PIC16C65AT-04E/L 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/L (same form factor and footprint) β differing in Program Memory Size, Core Architecture, Package, Program Memory Type, Mounting Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C65A-04E/L
β Drop-Inβ In Stock
$11.2 / Unit
View Datasheet βPIC16C65A-04/P
β Drop-Inβ In Stock
$8.1 / Unit
View Datasheet βPIC16C65A-04I/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C64A-04E/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C66A-04E/L
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16C65AT-04E/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 x 8 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 250 ns @ 4 MHz (4 x clock period) |
| Number of I/O Pins | 33 |
| Data Bus Width | 8 bits |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Supply Voltage Range | 4 V to 6 V |
| Operating Temperature Range | -40 C to +125 C (Automotive / E-grade) |
| Oscillator Type | External |
| Package Type | 44-PLCC (16.59 x 16.59 mm) |
| Terminal Form | J-Bend (Surface Mount) |
| Mounting Type | Surface Mount |
| Number of Terminals | 44 |
| Temperature Grade | Automotive |
| Packaging Media | Tape & Reel (TR) |
PIC16C65AT-04E/L 44-plcc (16.59 x 16.59 mm) Pin Configuration Guide
Pin configuration for PIC16C65AT-04E/L (44-plcc (16.59 x 16.59 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC16C65AT-04E/L.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16C65AT-04E/L is suitable for 7 applications: Automotive Body Electronics, Industrial Sensor Interface, Consumer Appliance Control, HVAC Fan and Pump Controller, Security and Access Keypad, Vending Machine Controller, Medical Device Front Panel.
Automotive Body Electronics
The PIC16C65AT-04E/L is well suited to automotive body controllers such as lighting modules, seat controllers, and door-lock actuators where its -40 C to +125 C E-grade temperature rating covers under-hood and cabin thermal stress. With 33 digital I/O pins and 4 MHz instruction throughput, the MCU can scan multiple switch inputs, drive relays and H-bridges via PWM, and run state-machine firmware within the 7 KB OTP budget. The OTP memory locks the code at production, protecting intellectual property and preventing field tampering, which is valued in OEM automotive supply chains.
Recommended
Industrial Sensor Interface
In industrial 4-20 mA sensor transmitters and thermocouple scanners, the PIC16C65AT-04E/L provides the deterministic interrupt response of the PIC16 RISC core to handle multi-channel ADC sequencing without jitter. The 33 I/O pins comfortably multiplex several sensor channels, indicator LEDs, and an isolated UART link to a PLC, while the 192-byte RAM holds temporary calibration data. Extended temperature tolerance supports deployment in factory cabinets where ambient temperatures can reach 85 C or higher.
Recommended
Consumer Appliance Control
White-goods such as washing machines, dishwashers, and microwave ovens rely on the PIC16C65AT-04E/L for keypad/display interface, motor timing via PWM, and safety interlocks. The OTP memory keeps per-unit firmware cost low while the 4 MHz clock is sufficient to drive triac-based heater control, brushed DC motor commutation, and buzzer tones. The 44-PLCC package can be socketed for after-sales service replacement, simplifying field repairs in markets where consumers value repairability over miniaturization.
Recommended
HVAC Fan and Pump Controller
The PIC16C65AT-04E/L handles closed-loop fan or pump speed control using on-chip timer PWM and a small lookup table for temperature-to-duty mapping. The 4 MHz clock and 250 ns instruction cycle are fast enough to sample an external NTC thermistor, run a PI control loop, and update PWM at 1 kHz without CPU saturation. Automotive-grade temperature tolerance supports outdoor HVAC units, and the OTP memory prevents firmware reverse-engineering of proprietary control curves.
Recommended
Security and Access Keypad
Door access keypads and alarm panels use the PIC16C65AT-04E/L to scan 4x4 matrix keypads, debounce contacts in firmware, drive a magnetic-stripe or RFID reader via UART, and control an electric strike. With 33 I/O, the MCU can multiplex keypad rows/columns, status LEDs, a buzzer, and a relay output without external I/O expanders. The OTP code lock prevents cloning of access credentials and is therefore preferred for high-security installations.
Recommended
Vending Machine Controller
Vending machines and kiosk controllers use the PIC16C65AT-04E/L to manage coin/bill acceptors via pulse counting, drive multi-segment LED or VFD displays through external drivers, and run vend-state logic. The PIC16 RISC architecture delivers deterministic response to coin pulses, ensuring accurate accounting even under mechanical contact bounce. The 7 KB OTP budget accommodates state machines for product selection, pricing tables, and audit logging, and the automotive temperature range covers outdoor cabinet deployments.
Recommended
Medical Device Front Panel
Front-panel controllers in non-invasive medical devices (e.g., blood-pressure monitors, infusion-pump keypads) leverage the PIC16C65AT-04E/L's deterministic interrupt response and 33 I/O to drive LCD segments, scan membrane keypads, and supervise sensor channels. While the device is not medical-grade certified, its extended temperature range and OTP code protection support IEC 60601-1 design reviews where locked firmware is required for regulatory submissions. Validation requires separate qualification of the final medical device.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65AT-04E/L β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65A-04E/L | PIC16C65A-04/P | PIC16C65A-04I/L | PIC16C64A-04E/L | PIC16C66A-04E/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 3.6 KB OTP | 14 KB OTP |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 128 bytes | 368 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Temperature Grade | Automotive (-40 to +125 C) | Automotive (-40 to +125 C) | Commercial (0 to +70 C) | Industrial (-40 to +85 C) | Automotive (-40 to +125 C) | Automotive (-40 to +125 C) |
| Number of I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Supply Voltage Range | 4 V to 6 V | 4 V to 6 V | 4 V to 6 V | 4 V to 6 V | 4 V to 6 V | 4 V to 6 V |
| Packaging Media | Tape & Reel | Tube | Tube | Tube | Tube | Tube |
Key Differentiators
- Higher temperature grade versus commercial part (vs PIC16C65A-04/P)
- Larger program memory than PIC16C64A in same package (vs PIC16C64A-04E/L)
- Tape-and-reel packaging media for SMT production (vs PIC16C65A-04E/L)
- Automotive grade in 4 MHz speed bin (vs PIC16C65A-04I/L)
Design Notes
OTP memory cannot be erased or rewritten once programmed, so firmware must be fully validated on a Flash-based development part (e.g., PIC16F877A-I/P) before committing to OTP production programming. Use a device programmer that supports the PIC16C6X OTP algorithm and verify the configuration-word settings (watchdog timer, code protection, oscillator mode) prior to running the batch.
The PIC16C65AT-04E/L operates from 4 V to 6 V; design the LDO or 5 V regulator with adequate headroom to handle automotive load-dump transients up to 40 V if used in 12 V vehicle systems. Add a bulk capacitor (>=10 uF) and a 100 nF decoupling capacitor close to the VDD/VSS pins. Estimated: at 4 MHz and all peripherals active, the device draws roughly 5 mA; budget for 20 mA peak including I/O switching.
The 44-PLCC J-bend package requires a PCB land pattern with J-lead footprints (IPC-7351 nominal PLCC-44) and a socketed footprint for prototype swap. Place the external crystal or resonator within 10 mm of OSC1/OSC2 pins and route the traces over a continuous ground plane to reduce EMI. Leave guard traces around the MCLR pin to prevent false resets from coupled noise.
Although the device is rated -40 C to +125 C junction, sustained operation at the upper limit with all 33 I/O pins sourcing 20 mA can drive power dissipation above 1 W and require thermal relief on the PCB. Estimated: at 5 V VDD with all I/O at 20 mA, total I/O dissipation is roughly 1 W, plus core current. Provide a copper pour connected to GND under the PLCC thermal pad area to spread heat.
For EMI-sensitive applications, place the PIC16C65AT-04E/L as close as practical to its connector and route high-speed signals (crystal, PWM, USART) over an unbroken ground reference plane. Use series resistors on MCLR and any reset input to limit transient injection. For industrial environments, add TVS diodes on supply rails to meet IEC 61000-4-2 ESD and IEC 61000-4-4 burst immunity.
Compliance Information
RoHS/REACH/lead-free status not explicitly listed in the provided web data; set to unknown per Data Authenticity Rule. AEC-Q100 is not applicable - the E-grade temperature range (-40 to +125 C) is a Microchip internal designation, not AEC-Q100 automotive qualification; consult Microchip for AEC-Q100-grade parts in the PIC16 family.
