PIC16C65BT-20I/L - 8-Bit 20MHz 7KB OTP MCU | Microchip | PLCC-44
MPN: PIC16C65BT-20I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.2 | $82.00 |
| 100 | $7.45 | $745.00 |
| 500 | $6.8 | $3,400.00 |
| 1,000 | $6.2 | $6,200.00 |
PIC16C65BT-20I/L Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral interfaces onto one silicon die. The 8-bit class targets simple deterministic control tasks with low BOM cost and minimal code footprint; within that class the PIC16C family adds RISC Harvard architecture (separate program and data buses), 14-bit wide instruction words, and a mid-range peripheral set. The 'C' suffix specifically denotes one-time-programmable (OTP) EPROM program memory, distinguishing this part from flash-based 'F' variants. This positions the PIC16C65BT-20I/L in the legacy industrial-control MCU segment where OTP, ruggedness, and long-life-cycle support matter more than in-system reprogrammability.
Key differentiating specifications include 20 MHz clock speed with a 200 ns instruction cycle, 7 KB (4K x 14) OTP program memory organized as 8K x 8 bytes, 192 bytes of RAM, 33 I/O pins, 8-channel 8-bit ADC, and an operating voltage range of 2.5 V to 6.0 V. The integrated peripherals comprise two 8-bit timers, one 16-bit timer, two CCP modules, a USART, and an MSSP (I²C/SPI) port, providing sufficient connectivity for typical industrial sensor and actuator interfaces.
Architecturally, the device uses a Harvard-style CPU with a hardware accumulator, W register, and 8-level deep stack; peripheral interrupts are vectored with single-context save/restore. CMOS fully-static design allows the clock to be stopped without losing register contents, enabling low-power sleep modes. The 8-bit ADC shares input pins with general-purpose I/O and supports both single-ended and differential conversions. The internal RC oscillator and wide operating-voltage range support both battery-backed and line-powered deployments.
Typical applications include industrial process-control front ends, motor-driver interface boards, building automation controllers, sensor hubs with UART/I²C peripherals, security and access-control panels, and legacy embedded-system upgrades where pin-compatible PIC16C65B replacements are required. The 33 I/O count and 20 MHz throughput also support small HMI panels and serial-bridge gateways.
When designing with this device, note that OTP memory cannot be re-programmed in-circuit; production programming must use a parallel programmer with the OTP window covered. For prototyping or field-updatable designs, migrate to the PIC16F877A-I/L or PIC16F887 family which share the same 44-PLCC pinout but use flash memory.
This page synthesizes real-time distributor pricing, parametric drop-in alternatives, and practical engineering design notes not available on a single manufacturer datasheet - a useful engineering starting point for sourcing the PIC16C65BT-20I/L or planning a like-for-like replacement.
Drop-in alternatives for PIC16C65BT-20I/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-20I/L (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, Core Architecture, Package, Serial Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C65BT-04I/PT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.1 / Unit
View Datasheet →PIC16C65B-20I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.42 / Unit
View Datasheet →PIC16C65B-04I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.75 / Unit
View Datasheet →PIC16C65AT-04I/PT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.5 / Unit
View Datasheet →PIC16C64A-20I/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.1 / Unit
View Datasheet →PIC16F877A-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C65BT-20I/L Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC16CXX Mid-Range |
| Core Processor | PIC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 20 MHz |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 bytes |
| Data EEPROM Size | Not present (OTP family) |
| Number of I/O Pins | 33 |
| Number of Timers | 3 (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit) |
| Number of CCP Modules | 2 |
| ADC | 8-channel, 8-bit |
| Serial Interfaces | USART, MSSP (I2C/SPI) |
| Supply Voltage | 2.5 V to 6.0 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Package / Case | 44-PLCC (16.59 x 16.59 mm, J-Lead) |
| Mounting Type | Surface Mount |
| Program Memory Type | OTP EPROM |
PIC16C65BT-20I/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 / ADC positive 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 (2.5 V to 6.0 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator crystal 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 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| 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 transmit / USART clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART receive / 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 (second VSS pin) |
| Pin 32 | VDD — Positive supply voltage (second VDD pin) |
| Pin 33 | RB0/INT — PORTB bit 0 / external interrupt input |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3/PGM — PORTB bit 3 / low-voltage programming input |
| 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 | VREF- — ADC negative reference voltage |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C65BT-20I/L is suitable for 7 applications: Industrial Process Control Front End, Motor Driver Interface Board, Building Automation Controller, Security and Access Control Panel, Sensor Hub with UART/I2C Peripherals, Legacy Embedded System Upgrade, Small HMI Panel Controller.
Industrial Process Control Front End
The PIC16C65BT-20I/L's 33 digital I/O pins, three counter/timers, and 8-channel 8-bit ADC make it well suited for industrial process-control front ends interfacing sensors (temperature, pressure, level) and actuators (relays, solenoids, valves). The 20 MHz core (200 ns instruction cycle) supports deterministic control loops up to a few kHz, while the USART and MSSP serial ports allow connection to industrial fieldbus bridges or HMIs. Industrial temperature grade (-40°C to +85°C) and OTP program memory (non-reprogrammable, immune to bit-flips) suit long-life factory-floor controllers where firmware is finalized at production. Compared with flash-based successors like the PIC16F877A-I/L, the C65BT offers higher production-line security at the cost of field upgradability.
Recommended
Motor Driver Interface Board
The PIC16C65BT-20I/L's two CCP (Capture/Compare/PWM) modules and three timers enable brushless DC or stepper motor commutation logic, direction control, and PWM speed regulation. The 33 I/O pins accommodate Hall-effect sensor inputs, enable signals, fault flags, and encoder feedback from a single MCU. The 20 MHz instruction cycle provides sufficient bandwidth for trapezoidal commutation at typical small-motor RPM. OTP memory prevents accidental firmware corruption in electrically noisy motor environments. The 44-PLCC footprint is mechanically robust for chassis-mounted driver boards, and the USART provides a debug/command channel for factory tuning.
Recommended
Building Automation Controller
The PIC16C65BT-20I/L fits mid-range building-automation controllers such as multi-zone HVAC thermostats, lighting panels, and access-control sub-controllers. The I2C/SPI MSSP port connects to environmental sensors and peripheral expanders, the USART links to a central BMS gateway, and the 33 I/O drive triac interfaces for AC loads. Operating voltage range (2.5 V to 6.0 V) supports 5 V regulated rails common in building-control panels. Industrial temperature grade accommodates mechanical rooms and unconditioned enclosures. OTP memory prevents unauthorized firmware rollback, an advantage for installed-building security applications.
Recommended
Security and Access Control Panel
The PIC16C65BT-20I/L's combination of 33 I/O, USART, MSSP, and ADC is well matched to security panels integrating keypad inputs, magnetic-door sensors, PIR motion detectors, sirens, and relay-controlled locks. The 20 MHz throughput allows polling of multiple zones in real time without missed events. OTP memory provides tamper-resistance against firmware extraction - a security advantage in physical-access products. The wide 2.5 V to 6.0 V supply range supports battery-backed operation with brown-out-reset supervision. The 44-PLCC J-Lead package is mechanically rugged for through-hole-friendly chassis mount assemblies.
Recommended
Sensor Hub with UART/I2C Peripherals
The PIC16C65BT-20I/L acts as a serial-bridge sensor hub aggregating I2C sensor data (temperature, humidity, accelerometers) and forwarding aggregated packets over UART to a host processor. The MSSP port supports both I2C master and SPI master modes, allowing flexible sensor selection. The 8-channel ADC adds analog-sensor support such as light sensors or 4-20 mA loops. With 192 bytes of RAM the hub manages small data buffers before forwarding to the host; for larger buffering an external I2C EEPROM or SRAM is required. The OTP non-reprogrammability prevents firmware tampering in unattended installations.
Recommended
Legacy Embedded System Upgrade
The PIC16C65BT-20I/L is commonly used as a like-for-like replacement in legacy systems where the original PIC16C65B socket is empty and the firmware was developed for that core. The pin-compatible 44-PLCC J-Lead package allows direct drop-in without PCB modification, and the instruction set, register map, and peripheral configuration match the original PIC16C65B family. For new designs, Microchip recommends migrating to the PIC16F877A-I/L or PIC16F887-I/L, which share the same pinout but use flash memory for field upgradability. OTP memory is a deliberate choice when production runs are stable and long-life-cycle support outweighs the need for firmware updates.
Recommended
Small HMI Panel Controller
The PIC16C65BT-20I/L can drive small character-LCD or simple graphic-LCD HMI panels via its MSSP (SPI) and parallel I/O. With 33 I/O, the MCU connects directly to a 4x4 keypad, a 16x2 or 20x4 character LCD, status LEDs, and a serial host link. The 20 MHz throughput is sufficient for screen refresh and key debounce without visible latency. OTP memory is acceptable when the HMI vocabulary is finalized at production. For multi-language or updatable HMI screens, the flash-based PIC16F877A-I/L provides the same peripheral set with field-reprogrammable memory.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65BT-20I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65BT-04I/PT | PIC16C65B-20I/P | PIC16C65B-04I/P | PIC16C64A-20I/L | PIC16F877A-I/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) 16.59 x 16.59 mm | 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 |
| Core | PIC 8-bit RISC | PIC 8-bit RISC | PIC 8-bit RISC | PIC 8-bit RISC | PIC 8-bit RISC | PIC 8-bit RISC |
| Maximum Clock Frequency | 20 MHz | 4 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 3.5 KB OTP (-50%) | 14 KB Flash (+100%) |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash (field-updatable) |
| ADC Resolution | 8-bit | 8-bit | 8-bit | 8-bit | 8-bit | 10-bit |
| Number of I/O | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial | Industrial | Industrial |
| Supply Voltage | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.0 V to 5.5 V |
Key Differentiators
- Higher maximum clock speed within the PIC16C65B family (vs PIC16C65BT-04I/PT)
- Field-reprogrammable flash memory as drop-in upgrade (vs PIC16F877A-I/L)
- Industrial temperature range in the 44-PLCC J-Lead package (vs PIC16C65B-20I/P)
Design Notes
The PIC16C65BT-20I/L operates from 2.5 V to 6.0 V with both VDD pins (11 and 32) and both VSS pins (12 and 31) required to be connected for proper power distribution. Use a 100 nF ceramic decoupling capacitor as close as possible to each VDD/VSS pair, plus a 10 µF bulk capacitor on the main supply rail. Brown-out reset and power-on reset are supported internally, but for battery-backed applications add an external voltage supervisor such as the MCP130T to guarantee a clean reset when VDD falls below the BVDD threshold. Estimated: at 20 MHz and 5 V supply, typical IDD is approximately 10-15 mA depending on peripheral activity and I/O loading.
Do not attempt to reprogram the OTP EPROM in-circuit; the PIC16C65BT-20I/L can only be programmed once using a parallel programmer such as the Microchip PICSTART Plus or MPLAB PM3, and the OTP window must be covered after programming. Apply VPP (typically 13.0 V to 13.5 V) only to the MCLR/VPP pin during programming; leaving VPP active during normal operation will hold the device in reset. For prototyping or field-updatable designs, choose the PIC16F877A-I/L which supports ICSP over RB6/RB7 with no high-voltage requirement. Also verify the ICSP clock and data pins are not loaded by external circuitry during programming.
The 44-PLCC J-Lead package requires careful PCB layout: place the device on a plated-through-hole land pattern with J-lead footprints slightly wider than the SOIC equivalent to accommodate the curved leads, and ensure the keep-out around the package is at least 2 mm for hand-solder rework. Both VDD pins (11 and 32) and both VSS pins (12 and 31) must be connected, even if one pair appears redundant - this is critical for thermal and electrical balance. Place the decoupling capacitors within 3 mm of their respective VDD/VSS pins and route the oscillator traces (OSC1, OSC2) as short as possible with a ground guard ring to reduce EMI susceptibility.
Compliance Information
RoHS/lead-free status not explicitly stated in the verified distributor data; check Microchip product page or datasheet 'marking' section for confirmation. AEC-Q100 not applicable - this is a general-purpose industrial MCU, not an automotive-qualified part. Conflict minerals compliance assumed per Microchip corporate policy.
