PIC16C65BT-04I/L - 8-Bit 4MHz PIC MCU 7KB OTP 44-PLCC | Microchip
MPN: PIC16C65BT-04I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $9.95 | $995.00 |
| 500 | $8.75 | $4,375.00 |
| 1,000 | $7.85 | $7,850.00 |
PIC16C65BT-04I/L Overview
A PIC (Peripheral Interface Controller) microcontroller is a compact, self-contained computer-on-a-chip integrating a CPU core, program memory, RAM, and peripherals on a single silicon die. The PIC16CXX family employs a RISC (Reduced Instruction Set Computer) architecture with 35 single-cycle instructions, providing predictable deterministic execution timing ideal for real-time embedded control. Within the broader taxonomy, PIC16C65B belongs to the mid-range PIC family (14-bit instruction word), sitting between base-line (12-bit) and enhanced mid-range/16-bit families, and is part of the Microchip 8-bit MCU portfolio used in industrial, consumer, and automotive embedded systems.
Key features of the PIC16C65BT-04I/L include 7KB (4K x 14) OTP program memory, 192 bytes of data RAM, 33 I/O pins, a 4MHz maximum operating frequency with a 1us instruction cycle, and integrated peripherals such as a USART, SPI/I2C, capture/compare/PWM modules, and an 8-bit ADC. Industrial temperature grade operation (-40C to +85C) and the robust PLCC-44 package make it suitable for harsh environment deployment.
The architecture uses a Harvard-style memory organization with separate program and data buses, enabling simultaneous instruction fetch and data access. The CMOS, fully-static design ensures low power consumption and operation across a wide voltage range (typically 2.5V to 6.0V). The OTP program memory is programmed once and cannot be erased, making this part cost-optimized for high-volume production runs where firmware is finalized.
Typical applications include industrial control systems, motor control, automotive body electronics, HVAC controllers, instrumentation, and consumer appliance control. The wide peripheral set (USART, SPI, I2C) and 33 I/O lines support both standalone embedded designs and master/slave networked architectures.
Designers should plan code to fit within 4K instruction words (7KB) and leverage the integrated peripherals to minimize external component count. For prototyping or firmware revision cycles, consider the flash-based PIC16F877A equivalent; for production runs where code is finalized, the OTP PIC16C65BT-04I/L offers cost advantages.
This page synthesizes distributor pricing, drop-in alternatives from the same PIC16CXX family, and practical design notes not consolidated on the manufacturer datasheet, helping engineers and procurement teams evaluate supply chain risk and second-source options.
Drop-in alternatives for PIC16C65BT-04I/L — 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 PIC16C65BT-04I/L (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, Mounting Type, RAM Size, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C65B-04I/L
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16C65B-04E/L
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →PIC16C65AT-10I/L
✅ Drop-In✓ In Stock
$8.2 / Unit
View Datasheet →PIC16C64A-04I/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.5 / Unit
View Datasheet →PIC16C65B-04/PQ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$10.25 / Unit
View Datasheet →PIC16C65BT-04I/L Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC (RISC, mid-range) |
| Core Size | 8-bit |
| Maximum Clock Frequency | 4 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM Size | 192 x 8 bytes |
| Number of I/O Pins | 33 |
| Package / Case | 44-PLCC (J-Lead, 16.59 x 16.59 mm) |
| Number of Pins | 44 |
| Oscillator Type | External |
| Temperature Grade | Industrial |
| Operating Temperature | -40C to +85C |
| Mounting Type | Surface Mount |
| Peripherals | USART, SPI, I2C, CCP, 8-bit ADC |
| Series | PIC16C6x |
| Sub-series | PIC16C63A/65B/73B/74B |
| Packaging | Tape & Reel (TR) |
PIC16C65BT-04I/L Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / Voltage reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI Slave Select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / Chip Select / Analog input 7 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator input / External clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator output / Clock output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage |
| Pin 33 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3 — PORTB bit 3 |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C65BT-04I/L is suitable for 6 applications: Industrial Motor Control, HVAC Climate Controllers, Consumer Appliance Control, Automotive Body Electronics, Test and Measurement Instrumentation, Security and Access Control Panels.
Industrial Motor Control
The PIC16C65BT-04I/L is well-suited for industrial motor control applications including brushed DC, stepper, and small BLDC motor drives. The integrated CCP (Capture/Compare/PWM) modules provide hardware PWM generation, eliminating CPU overhead for waveform synthesis, while the 33 I/O pins handle direction, enable, fault feedback, and encoder inputs. At 4MHz with a 1us instruction cycle, the 8-bit PIC mid-range core delivers deterministic interrupt response critical for closed-loop control loops. The 7KB OTP program memory accommodates motor control state machines, PID firmware, and lookup tables. Unlike newer flash PICs, the OTP variant is cost-optimized once firmware is finalized for production runs.
Recommended
HVAC Climate Controllers
HVAC climate controllers benefit from the PIC16C65BT-04I/L's industrial temperature rating (-40C to +85C) and integrated peripherals. The 8-bit ADC reads thermistor temperature sensors and pressure transducers, while the USART and SPI interfaces connect to display modules, communication transceivers, and remote sensors. The 33 I/O lines drive relays for compressor control, fan speed stages, valve actuators, and LED indicators. With 7KB of OTP code space, firmware can include control loops, scheduling logic, and user interface state machines. The PLCC-44 J-lead package provides robust mechanical connections on control board assemblies subject to thermal cycling.
Recommended
Consumer Appliance Control
Consumer appliances (washing machines, dishwashers, microwave ovens, refrigerators) deploy the PIC16C65BT-04I/L as the central embedded controller. The 7KB OTP memory and 192-byte RAM are adequate for appliance state machines, sensor processing, and user interface handling, while the integrated peripherals (USART, SPI, I2C, ADC, CCP/PWM) consolidate what would otherwise require multiple discrete ICs. The OTP program memory provides anti-clone protection - once programmed, firmware cannot be read back - which is valuable for high-volume appliance production. The 44-PLCC J-lead package supports automated SMT assembly and provides mechanical robustness against vibration in appliance environments.
Recommended
Automotive Body Electronics
Automotive body electronics modules (window lift, mirror adjustment, seat controller, lighting control) use the PIC16C65BT-04I/L in the industrial temperature variant for non-powertrain applications. The integrated USART enables LIN (Local Interconnect Network) communication with vehicle body controllers when paired with a LIN transceiver. The CCP modules drive PWM outputs for lighting dimming and motor speed control. The 7KB OTP accommodates LIN protocol stack, diagnostics, and actuator control logic. The 4MHz operating frequency is sufficient for body electronics timing budgets, while the 44-PLCC package withstands automotive underhood thermal and vibration stress.
Recommended
Test and Measurement Instrumentation
Test and measurement instruments (digital multimeters, oscilloscope front-ends, data loggers, calibration fixtures) leverage the PIC16C65BT-04I/L for measurement control and display driving. The 8-bit ADC reads sensor inputs, while the 33 I/O lines scan keypads, drive 7-segment or LCD displays, and control measurement range switching relays. The USART enables RS-232/USB communication with host PCs for data export. With 192 bytes of RAM, the controller handles measurement buffering and unit conversion. The OTP memory prevents unauthorized firmware extraction from instrumentation, protecting calibration constants and proprietary measurement algorithms.
Recommended
Security and Access Control Panels
Security alarm panels and access control systems use the PIC16C65BT-04I/L as the supervision controller for sensor inputs (PIR, door contacts, glass-break detectors), keypad interfaces, and siren/relay outputs. The 33 I/O lines accommodate multiple zone inputs and output controls, while the USART connects to central monitoring station modems or wireless communication modules. The OTP program memory prevents reverse-engineering of proprietary security algorithms and panel logic. Industrial temperature grade operation ensures reliable performance in unheated warehouses, garages, and outdoor enclosures where security equipment is frequently deployed.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65BT-04I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65B-04I/L | PIC16C65B-04E/L | PIC16C65AT-10I/L | PIC16C64A-04I/L | PIC16C65B-04/PQ |
|---|---|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) | 3.5 KB OTP (-50%) | 7 KB OTP (4K x 14) |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 10 MHz (+150%) | 4 MHz | 4 MHz |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Extended Commercial (0C to +70C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 128 bytes (-33%) | 192 bytes |
| Number of I/O | 33 | 33 | 33 | 33 | 33 | 33 |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Exact 7KB OTP program memory parity with no firmware changes required (vs PIC16C64A-04I/L)
- Pin-compatible modern flash alternative available (vs PIC16F877A-I/L)
- Industrial temperature grade availability (vs PIC16C65B-04/PQ)
Design Notes
The PIC16C65BT-04I/L operates from a single VDD supply (typically 2.5V to 6.0V) and requires decoupling capacitors within 1 cm of the VDD/VSS pins. Use a 100nF ceramic capacitor on each VDD/VSS pair (the device has two VDD and two VSS pins on opposite sides of the PLCC package for noise immunity) plus a 10uF bulk capacitor. Add a 10k pull-up resistor on the MCLR pin and a decoupling capacitor to prevent spurious resets during voltage transients.
PLCC-44 J-lead packages require careful PCB land pattern design with adequate thermal relief on through-hole test points. The PLCC socket (or solder paste stencil for SMT) should match the JEDEC PLCC-44 standard footprint with 1.27 mm pitch pads. Place the crystal or resonator as close as possible to the OSC1/OSC2 pins (within 5 mm) and surround it with a ground guard ring to minimize EMI coupling into the oscillator circuit.
OTP (One-Time Programmable) memory cannot be erased after programming - each programming attempt permanently writes the device. Confirm firmware correctness with PIC16F877A flash-based prototypes before ordering OTP PIC16C65B production units, as any firmware bug becomes unfixable. The PIC16F877A-I/L is pin-compatible with the PIC16C65B-04I/L and provides 8KB flash + 256B EEPROM + 368B RAM as a modern alternative for prototyping and low-volume production.
When using the PIC16C65BT-04I/L's SPI or I2C peripherals at 4MHz, ensure that the SCK/SDI/SDO traces are short (< 50 mm) and routed with a ground reference plane to minimize reflections. For long-distance communications, use the integrated USART with a MAX232 or MAX485 transceiver for RS-232/RS-485 signaling rather than relying on direct pin drive. The PSP (Parallel Slave Port) on PORTD requires external bus arbitration logic when interfacing with bus-master processors.
Compliance Information
RoHS, REACH, lead-free, and halogen-free compliance status not present in verified web data; check the manufacturer datasheet and product page for current compliance documentation. AEC-Q100 not qualified - this part is industrial grade and not intended for automotive safety-critical applications.
