PIC16C65BT-20E/L - 8-bit 20MHz 7KB OTP MCU | 44-PLCC | Microchip
MPN: PIC16C65BT-20E/L β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.74 | $7.74 |
| 10 | $7.42 | $74.20 |
| 100 | $6.95 | $695.00 |
| 500 | $6.4 | $3,200.00 |
| 1,000 | $5.85 | $5,850.00 |
PIC16C65BT-20E/L Overview
What is an 8-bit microcontroller? An 8-bit MCU is a single-chip computer that processes data in 8-bit words and integrates a CPU, program memory, data RAM, and peripheral set on one die. The PIC16C65BT-20E/L belongs to the PIC16CXX mid-range family (PIC16C65B subgroup), positioned as a low-cost, high-performance CMOS fully-static device that competes architecturally with the Intel 8051 and Motorola 68HC11, while offering a Harvard architecture and RISC instruction set for deterministic single-cycle execution on most instructions.
Key features include 33 digital I/O pins, three 8-bit timer/counters with optional prescalers, two Capture/Compare/PWM (CCP) modules, a 10-bit 8-channel Analog-to-Digital Converter, a synchronous serial port (SSP) supporting SPI and I2C master/slave modes, a USART with 9-bit address detect, and a parallel slave port for direct bus interface to external processors or memory. The brown-out reset (BOR) circuit and power-on reset (POR) ensure reliable startup across the full 4 V to 5.5 V supply window.
The PIC16C65B silicon implements a 14-bit wide instruction word with a 35-instruction set and a hardware 8-level deep stack, providing code density comparable to early ARM7TDMI for byte-oriented control tasks. Program memory is OTP (not flash or EEPROM), which means the firmware is permanently written by an EPROM programmer at production - this part is therefore best suited for mature, stable firmware in volume production rather than iterative prototyping.
Typical applications include industrial control panels, automotive body and chassis modules, point-of-sale terminals, uninterruptible power supply (UPS) controllers, and embedded sensor hubs where deterministic response time and long-term component availability outweigh the convenience of in-system reprogramming. The 'E' temperature grade (-40C to +125C) specifically enables under-hood automotive use and outdoor industrial installations.
When designing with the PIC16C65BT-20E/L, place a 0.1 uF decoupling capacitor within 5 mm of each VDD/VSS pair, use a 4 MHz to 20 MHz crystal or ceramic resonator with the internal oscillator block, and ensure the MCLR pin is pulled high through a 10 kohm resistor with a 100 nF cap to ground for clean device reset. The OTP memory window requires shaded UV erasure only if windowed packages are used; standard PLCC parts are one-time-programmable and cannot be erased electrically.
This page synthesizes distributor pricing, drop-in alternatives from the same PIC16C65B family and PIC16F871 family, and practical design notes that are not aggregated in any single source - including a parameter-by-parameter comparison against the PIC16F871-E/L flash-based successor, the PIC16C74B-20E/L larger-memory variant, and the legacy PIC16C65B-20E/L industrial-grade part.
Drop-in alternatives for PIC16C65BT-20E/L β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C65B-20E/L
β Drop-Inβ In Stock
$7.65 / Unit
View Datasheet βPIC16F871-E/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16F877A-E/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C74B-20E/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C65BT-20E/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16CXX mid-range, 8-bit RISC |
| Instruction Word Width | 14 bits |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM | 192 x 8 bytes |
| Data EEPROM | Not present on this part |
| Maximum CPU Clock | 20 MHz |
| Supply Voltage (VDD) | 4 V to 5.5 V |
| I/O Pins | 33 |
| ADC | 10-bit, 8 channels |
| Timers | 3 x 8-bit (Timer0/Timer2 + WDT) with Timer1 as 16-bit |
| CCP Modules | 2 |
| Serial Interfaces | SSP (SPI / I2C), USART (with 9-bit address detect) |
| Parallel Slave Port | Yes (8-bit) |
| Package | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| Operating Temperature | -40C to +125C (Automotive grade, 'E' suffix) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (Pb-free per PLCC J-lead) |
| Terminal Form | J-Bend |
| Package Code (JEDEC) | QCCJ |
PIC16C65BT-20E/L Pin Configuration
| Pin 1 | RA2/AN2 β PORTA bit 2 / Analog input channel 2 |
| Pin 2 | RA3/AN3/VREF+ β PORTA bit 3 / Analog input channel 3 / ADC positive voltage reference |
| Pin 3 | RA4/T0CKI β PORTA bit 4 (open-drain) / Timer0 clock input |
| Pin 4 | RA5/AN4/SS β PORTA bit 5 / Analog input channel 4 / SPI slave select |
| Pin 5 | RE0/RD/AN5 β PORTE bit 0 / Parallel Slave Port RD signal / Analog input channel 5 |
| Pin 6 | RE1/WR/AN6 β PORTE bit 1 / Parallel Slave Port WR signal / Analog input channel 6 |
| Pin 7 | RE2/CS/AN7 β PORTE bit 2 / Parallel Slave Port CS signal / Analog input channel 7 |
| Pin 8 | OSC1/CLKIN β Crystal oscillator input / external clock input |
| Pin 9 | OSC2/CLKOUT β Crystal oscillator output / clock output (Fosc/4) |
| Pin 10 | RC0/T1OSO/T1CKI β PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 β PORTC bit 1 / Timer1 oscillator input / Capture Compare PWM 2 |
| Pin 12 | RC2/CCP1 β PORTC bit 2 / Capture Compare PWM 1 |
| Pin 13 | RC3/SCK/SCL β PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RD0/PSP0 β PORTD bit 0 / Parallel Slave Port data bit 0 |
| Pin 15 | RD1/PSP1 β PORTD bit 1 / Parallel Slave Port data bit 1 |
| Pin 16 | RD2/PSP2 β PORTD bit 2 / Parallel Slave Port data bit 2 |
| Pin 17 | RD3/PSP3 β PORTD bit 3 / Parallel Slave Port data bit 3 |
| Pin 18 | RC4/SDI/SDA β PORTC bit 4 / SPI data in / I2C data |
| Pin 19 | RC5/SDO β PORTC bit 5 / SPI data out |
| Pin 20 | RC6/TX/CK β PORTC bit 6 / USART asynchronous transmit / USART synchronous clock |
| Pin 21 | RC7/RX/DT β PORTC bit 7 / USART asynchronous receive / USART synchronous data |
| Pin 22 | RD4/PSP4 β PORTD bit 4 / Parallel Slave Port data bit 4 |
| Pin 23 | RD5/PSP5 β PORTD bit 5 / Parallel Slave Port data bit 5 |
| Pin 24 | RD6/PSP6 β PORTD bit 6 / Parallel Slave Port data bit 6 |
| Pin 25 | RD7/PSP7 β PORTD bit 7 / Parallel Slave Port data bit 7 |
| Pin 26 | VSS β Ground reference |
| Pin 27 | VDD β Positive supply (4.0 V to 5.5 V) |
| Pin 28 | RB0/INT β PORTB bit 0 / External interrupt input |
| Pin 29 | RB1 β PORTB bit 1 |
| Pin 30 | RB2 β PORTB bit 2 |
| Pin 31 | RB3 β PORTB bit 3 |
| Pin 32 | RB4 β PORTB bit 4 |
| Pin 33 | RB5 β PORTB bit 5 |
| Pin 34 | RB6/PGC β PORTB bit 6 / In-circuit debugger clock (ICSP clock) |
| Pin 35 | RB7/PGD β PORTB bit 7 / In-circuit debugger data (ICSP data) |
| Pin 36 | RA0/AN0 β PORTA bit 0 / Analog input channel 0 |
| Pin 37 | RA1/AN1 β PORTA bit 1 / Analog input channel 1 |
| Pin 38 | NC β Not connected (per datasheet) |
| Pin 39 | NC β Not connected (per datasheet) |
| Pin 40 | NC β Not connected (per datasheet) |
| Pin 41 | NC β Not connected (per datasheet) |
| Pin 42 | NC β Not connected (per datasheet) |
| Pin 43 | MCLR/VPP β Master clear reset input (active low) / Programming voltage input |
| Pin 44 | NC β Not connected (per datasheet) |
Typical Applications
PIC16C65BT-20E/L is suitable for 6 applications: Automotive Body Control Module, Industrial PLC and Process Controller, Uninterruptible Power Supply (UPS) Controller, Point-of-Sale (POS) Terminal, Outdoor Environmental Sensor Hub, Security Alarm Panel.
Automotive Body Control Module
The PIC16C65BT-20E/L fits automotive body control modules (BCMs) because of its -40C to +125C automotive temperature grade ('E' suffix), 33 digital I/O lines for driving lamp relays and switch inputs, and 7 KB OTP that holds the BCM fixed-function firmware for window lifters, mirror controls, and central locking. Its 8-channel 10-bit ADC reads multiplexed switch and potentiometer positions with 39 LSB full-scale resolution, while the USART with 9-bit address detect enables multi-drop LIN or proprietary body bus communication. Compared with flash-based PIC16F877A, the OTP memory prevents post-production firmware readback, which is a security advantage against cloning attacks in aftermarket automotive electronics. The 44-PLCC J-Lead package survives automotive under-dash vibration when socketed onto a pin header or soldered to a FR-4 PCB with through-hole staking.
Recommended
Industrial PLC and Process Controller
For industrial PLCs and process controllers, the PIC16C65BT-20E/L offers the deterministic 200 ns single-cycle instruction timing required for PID loop execution at 20 MHz, 8-channel 10-bit ADC for analog sensor inputs (4-20 mA, 0-10V, RTD bridges), and two CCP modules for PWM-driven valve actuators or heater SSR control. The 7 KB OTP memory holds ladder-logic interpreter or compiled state-machine code without external flash. Brown-out reset at ~4.0 V and watchdog timer with on-chip RC oscillator provide the supervisory functions demanded by IEC 61131-2 industrial control standards. The 44-PLCC package allows socketed field replacement, simplifying maintenance contracts in factory automation systems.
Recommended
Uninterruptible Power Supply (UPS) Controller
The PIC16C65BT-20E/L is well suited to UPS controller boards because it combines a fast 20 MHz core with 33 I/O lines for monitoring mains voltage, battery voltage, current shunts, and inverter drive signals. Its 8-channel 10-bit ADC samples battery voltage and load current with sufficient resolution for state-of-charge estimation, while the two CCP modules generate PWM signals for the inverter IGBT bridge. The OTP memory protects proprietary battery-management firmware from reverse engineering. Operating from 4.0-5.5 V with a simple 7805-derived auxiliary rail, the part tolerates the wide input voltage swings typical of UPS front-end PFC stages. The 44-PLCC package is preferred over QFP for industrial UPS designs because it is socketable, simplifying factory calibration.
Recommended
Point-of-Sale (POS) Terminal
In POS terminal designs, the PIC16C65BT-20E/L handles keypad scanning, LCD backlight control, magnetic-stripe reader interface via USART, and thermal printer stepper motor drive via CCP PWM. Its 192-byte RAM accommodates the small transaction record buffer, and the 7 KB OTP holds the POS firmware with no need for external memory. The SSP peripheral supports I2C communication with EEPROM cash-drawer sensors and SPI to a contactless smartcard reader. The 44-PLCC package fits inside compact POS enclosures and the automotive temperature grade tolerates the heat buildup behind a continuously-running thermal print head.
Recommended
Outdoor Environmental Sensor Hub
The PIC16C65BT-20E/L works in outdoor environmental sensor hubs because the -40C to +125C operating range handles direct sunlight and winter temperatures in unattended weather stations. Its 8-channel ADC reads temperature, humidity, soil moisture, and solar radiation sensors; the USART streams the measurements over RS-485 to a central logger; and the SSP supports I2C to a precision barometric pressure sensor. Sleep mode with watchdog timer draws <10 uA between samples, enabling multi-year battery life from a 3.6 V lithium thionyl chloride primary cell. The OTP memory is ideal for sealed IP67 enclosures where firmware updates are not feasible.
Recommended
Security Alarm Panel
The PIC16C65BT-20E/L is well matched to security alarm panels because it provides 33 I/O lines for zone inputs (door, window, PIR motion detectors) and relay outputs (siren, dialer, keypad LEDs) without external I/O expanders. The OTP memory prevents attackers from reading the alarm logic to bypass it, a key security advantage over flash-based parts. Brown-out reset and watchdog timer ensure the panel recovers from supply glitches and software lockups. The 8-channel ADC reads battery voltage and line-voltage tamper loops. The automotive temperature grade tolerates equipment-room heat, and the 44-PLCC socketed design allows installers to swap a failed MCU in the field without re-soldering.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65BT-20E/L β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65B-20E/L | PIC16F871-E/L | PIC16F877A-E/L | PIC16C74B-20E/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same |
| Program Memory Type | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) - same | 3.5 KB flash (-50%) | 14 KB flash (+100%) | 4 KB OTP (-43%) |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| RAM | 192 bytes | 192 bytes | 128 bytes | 368 bytes (+92%) | 192 bytes |
| Data EEPROM | Not present | Not present | 64 bytes | 256 bytes | Not present |
| In-Circuit Programming | No (OTP only) | No | Yes (ICSP) | Yes (ICSP) | No (OTP only) |
| Supply Voltage | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 5.5 V |
| Operating Temperature | -40C to +125C (Automotive) | -40C to +125C (Automotive) | -40C to +125C (Automotive) | -40C to +125C (Automotive) | -40C to +125C (Automotive) |
| Lifecycle Status | NRND | NRND | Active | Active | NRND |
Key Differentiators
- Automotive-grade -40C to +125C with OTP code security (vs PIC16F877A-E/L)
- Larger 7 KB OTP vs 3.5 KB flash in same PLCC-44 footprint (vs PIC16F871-E/L)
- Direct legacy migration from PIC16C65B predecessor family (vs PIC16C74B-20E/L)
Design Notes
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of each VDD/VSS pair (pins 11/12 and 31/32 on the 40-pin DIP; on the 44-PLCC the VDD/VSS pair is pin 27/26). Add a bulk 10 uF tantalum or aluminum polymer capacitor at the board input to handle transient current spikes when the ADC and CCP modules switch simultaneously. The PIC16C65BT-20E/L draws approximately 13 mA active at 20 MHz and 5 V; in Sleep mode with WDT disabled, current drops to less than 1 uA per Microchip datasheet DS30234D. Use an MCP1700 or equivalent low-Iq LDO if the design must operate from a 12 V or 24 V industrial supply rail.
Route the crystal traces (OSC1 pin 8, OSC2 pin 9) as short and symmetrical as possible, with the crystal placed within 10 mm of the MCU and a guard ring tied to ground around both traces to minimize EMI coupling. Keep high-speed CCP1 (pin 12) and CCP2 (pin 11) PWM traces away from the analog ADC inputs (RA0-RA5, RE0-RE2) to avoid digital switching noise coupling into the ADC conversion. The MCLR pin (pin 43) must have a 10 kohm pull-up to VDD and a 100 nF cap to ground placed within 5 mm of the pin to ensure clean device reset during power-up per Microchip application note AN587.
Do not assume OTP memory can be electrically erased - it cannot. Use a PIC16F877A-E/L prototype with flash memory to develop and debug firmware, then commit the final code to the PIC16C65BT-20E/L OTP for production. Verify the brown-out reset voltage (~4.0 V) is compatible with your supply - if operating near 4.5 V with significant ripple, the BOR may reset the MCU repeatedly. The I2C SSP peripheral requires external 4.7 kohm pull-ups on SDA and SCL because the PORTC open-drain mode must be selected in firmware; do not rely on internal weak pull-ups which are not strong enough for standard I2C bus speeds per Microchip PIC16 mid-range family reference manual.
Compliance Information
RoHS compliant per Microchip product page (Pb-free terminal finish). The 'E' suffix designates the automotive -40C to +125C temperature grade rather than a formal AEC-Q100 qualification - automotive customers should request the specific PPAP documentation from Microchip for AEC-Q100 compliance verification. REACH compliant per EU regulation (EC) No 1907/2006 with no SVHC above 0.1% w/w threshold.