PIC16C65BT-04E/L - 8-Bit 4MHz OTP MCU 7KB Flash 44-PLCC | Microchip
MPN: PIC16C65BT-04E/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.4 | $4,200.00 |
| 1,000 | $7.1 | $7,100.00 |
PIC16C65BT-04E/L Overview
What is a PIC16C-series microcontroller? The PIC16C family is Microchip's classic mid-range 8-bit RISC architecture, using a Harvard design with separate program and data buses, a 14-bit instruction word, and a deterministic 4-cycle instruction pipeline. As a member of the broader microcontroller hierarchy (MCU -> 8-bit MCU -> RISC MCU -> PIC mid-range -> OTP variant), the PIC16C65B targets applications where field programmability is not required and low unit cost is paramount.
Key features include 7KB OTP program memory allowing one-time per C-code burn-in, 192 bytes of SRAM data memory, 33 I/O lines with high-current sink/source capability for direct LED or relay drive, and a wide 2.5 V to 5.5 V operating voltage range that simplifies power-tree design in industrial and automotive environments. The extended (-40C to +125C) automotive temperature grade enables under-hood deployment without additional thermal hardening.
The PIC16C65B uses CMOS, fully-static process technology with an external oscillator interface that accepts crystal, ceramic resonator, or external clock inputs. Its 14-bit-wide instruction set enables single-cycle arithmetic plus branch operations, while the dual PWM and Capture/Compare peripherals simplify motor-control and switch-mode power-supply feedback loops. Brown-out Reset and the integrated Watchdog Timer provide the deterministic recovery required by automotive and industrial safety standards.
Typical applications include automotive body controllers and HVAC panels, industrial sensor interfaces, motor-control front-ends, lighting-control modules, and home-automation hubs. The combination of OTP memory, extended temperature range, and rich peripheral mix makes it well suited for high-volume, fixed-function commercial and automotive embedded designs.
When designing with this MCU, reserve one I/O line for In-Circuit Serial Programming (ICSP) and pair the external oscillator with the manufacturer-recommended loading capacitor values (typically 15-33 pF) to guarantee frequency stability across the automotive temperature window. The PLCC (J-Lead) package allows socket-mounting for prototype and low-volume production.
This page synthesizes current distributor inventory, pricing, drop-in replacement candidates, and practical design notes not consolidated in the manufacturer datasheet, giving engineers a one-stop reference for sourcing and qualifying the PIC16C65BT-04E/L.
Drop-in alternatives for PIC16C65BT-04E/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-04E/L (same form factor and footprint) — differing in Mounting Type, Package, Timers, Core Architecture, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C65B-04E/L
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →PIC16C65B-04I/PQ
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16C65B-04E/PQ
✅ Drop-In✓ In Stock
$11.1 / Unit
View Datasheet →PIC16C65B-04I/P
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →PIC16C65B-04E/P
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16C65B-20I/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C65B-20I/P
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →PIC16C65BT-04E/L Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC (mid-range) |
| Family | PIC16CXX |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7KB (4K x 14) |
| RAM Size | 192 bytes |
| EEPROM Size | None |
| Maximum Clock Frequency | 4 MHz |
| Operating Voltage Range | 2.5 V to 5.5 V |
| Number of I/O Pins | 33 |
| Package / Case | 44-PLCC (J-Lead, 16.59 x 16.59 mm) |
| Temperature Grade | Automotive (Extended -40C to +125C) |
| Oscillator Type | External (crystal/ceramic/clock) |
| Communication Interfaces | I2C, SPI, UART/USART |
| Timers | Two 8-bit + one 16-bit |
| PWM Modules | Dual Capture/Compare/PWM |
| Peripherals | Brown-out Detect/Reset, POR, WDT |
| Mounting Type | Surface Mount (PLCC socket-compatible) |
PIC16C65BT-04E/L Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 3 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 4 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / ADC reference |
| Pin 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 6 | RA5/SS/AN4 — PORTA bit 5 / SPI slave select / analog input 4 |
| Pin 7 | RE0/RD/AN5 — PORTE bit 0 / parallel-port read / analog input 5 |
| Pin 8 | RE1/WR/AN6 — PORTE bit 1 / parallel-port write / analog input 6 |
| Pin 9 | RE2/CS/AN7 — PORTE bit 2 / parallel-port chip-select / analog input 7 |
| Pin 10 | VDD — Positive supply (5 V) |
| Pin 11 | VSS — Ground |
| Pin 12 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Pin 13 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 14 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / clock in |
| Pin 15 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 16 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Pin 17 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 18 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 19 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 20 | RC6/TX/CK — PORTC bit 6 / UART transmit / clock |
| Pin 21 | RC7/RX/DT — PORTC bit 7 / UART receive / data |
| Pin 22 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 23 | RB1 — PORTB bit 1 |
| Pin 24 | RB2 — PORTB bit 2 |
| Pin 25 | RB3 — PORTB bit 3 |
| Pin 26 | RB4 — PORTB bit 4 |
| Pin 27 | RB5 — PORTB bit 5 |
| Pin 28 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 29 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 30 | VSS — Ground |
| Pin 31 | RD0 — PORTD bit 0 |
| Pin 32 | RD1 — PORTD bit 1 |
| Pin 33 | RD2 — PORTD bit 2 |
| Pin 34 | RD3 — PORTD bit 3 |
| Pin 35 | RD4 — PORTD bit 4 |
| Pin 36 | RD5 — PORTD bit 5 |
| Pin 37 | RD6 — PORTD bit 6 |
| Pin 38 | RD7 — PORTD bit 7 |
| Pin 39 | VSS — Ground |
| Pin 40 | VDD — Positive supply (5 V) |
| Pin 41 | MCLR/VPP — Master clear reset / programming 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-04E/L is suitable for 6 applications: Automotive Body Controllers, Industrial Sensor Interfaces, Motor Control Front-Ends, Lighting Control Modules, Home Automation Hubs, HVAC Control Panels.
Automotive Body Controllers
The PIC16C65BT-04E/L fits automotive body-control modules because its 44-pin PLCC package, automotive -40C to +125C temperature grade, and 33 high-current I/O pins enable direct drive of relays, solenoids, and LED indicators in central body computers controlling lighting, door locks, and window lifters. The 7KB OTP memory holds fixed body-control firmware at the lowest unit cost, while the integrated Brown-out Reset and Watchdog Timer provide the deterministic recovery required by automotive safety standards. The dual Capture/Compare/PWM modules generate precise signals for motor-control loops, and the UART/USART interface connects to body-network LIN or K-Line transceivers for diagnostic communication with the vehicle's central gateway.
Recommended
Industrial Sensor Interfaces
The PIC16C65BT-04E/L suits industrial sensor-interface boards because its 4 MHz RISC core delivers deterministic 1-microsecond instruction cycles for time-critical sensor polling, and the 33 I/O pins accommodate multiple discrete and analog sensor inputs simultaneously. The 7KB OTP memory stores fixed sensor-fusion and calibration firmware at minimal unit cost, while the I2C and SPI peripherals communicate directly with digital temperature, pressure, and flow sensors. The extended -40C to +125C automotive temperature grade tolerates factory-floor thermal swings, and the integrated Brown-out Reset guards against supply brown-out events common in industrial 24 V bus environments, providing the reliability required for unattended process-control installations.
Recommended
Motor Control Front-Ends
The PIC16C65BT-04E/L serves as a motor-control front-end because its dual Capture/Compare/PWM modules generate complementary PWM outputs at programmable frequencies for driving half-bridges or full H-bridges controlling DC and stepper motors. The 4 MHz instruction cycle provides the resolution needed for smooth low-speed torque control, while the 16-bit timer captures feedback-encoder pulses for closed-loop speed regulation. The 192 bytes of SRAM buffer motor-state variables and PID-controller coefficients, and the 7KB OTP memory stores application-specific motor profiles at minimal unit cost. The automotive temperature grade allows deployment in under-hood and industrial motor-drive environments without additional thermal hardening.
Recommended
Lighting Control Modules
The PIC16C65BT-04E/L fits lighting-control modules in architectural and stage-lighting installations because its 33 I/O pins directly drive high-current TRIAC or MOSFET stages for dimmer circuits, while the 7KB OTP memory stores preset scenes and dim curves at minimal unit cost. The Capture/Compare/PWM modules generate phase-angle or PWM dimming signals synchronized to the AC line, with the 16-bit timer providing zero-crossing detection for leading-edge dimmers. The extended temperature range allows deployment in unconditioned enclosures, and the Brown-out Reset ensures clean lamp shutdown during brown-out events. The UART peripheral accepts DMX-style control commands from a central lighting console for architectural and entertainment lighting.
Recommended
Home Automation Hubs
The PIC16C65BT-04E/L serves as a fixed-function controller in home-automation hub designs, where its 7KB OTP memory holds pre-validated firmware for tasks such as PIR motion aggregation, thermostat scheduling, and HVAC damper control without the cost overhead of Flash. The UART/USART interface bridges to wireless transceivers for X10, Zigbee, or proprietary RF links, while the I2C peripheral reads room-temperature and humidity sensors. The 4 MHz CPU clock executes the control loop in real time, and the Brown-out Reset protects against power-glitch-induced lockups common in wall-wart-powered hubs. The automotive temperature grade tolerates attic and basement deployments where ambient temperatures swing widely.
Recommended
HVAC Control Panels
The PIC16C65BT-04E/L fits HVAC control panels because its automotive -40C to +125C temperature grade survives rooftop-unit thermal cycles, while its 33 I/O pins drive seven-segment displays, keypads, relay coils, and triac outputs for compressor and fan stages. The 7KB OTP memory stores fixed control algorithms and safety interlocks at minimal unit cost, and the dual PWM modules generate variable-fan-speed drive signals. The 16-bit timer captures tachometer feedback from blower motors for closed-loop airflow control, while the integrated Brown-out Reset and Watchdog Timer satisfy the safety expectations of HVAC OEMs. The UART peripheral supports service-port diagnostics for HVAC technicians in the field.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65BT-04E/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65B-04E/L | PIC16C65B-04I/PQ | PIC16C65B-04E/PQ | PIC16C65B-04I/P |
|---|---|---|---|---|---|
| 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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory | 7KB OTP | 7KB OTP | 7KB OTP | 7KB OTP | 7KB OTP |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Number of I/O | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Automotive -40C to +125C | Automotive -40C to +125C | Industrial -40C to +85C | Automotive -40C to +125C | Industrial -40C to +85C |
| Packaging Format | Tape & Reel | Tray | Tray | Tape & Reel | Tray |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Automotive -40C to +125C temperature grade on a 4 MHz mid-range core (vs PIC16C65B-04I/L)
- 33 high-current I/O pins in a 44-pin PLCC package (vs PIC16C63A-04E/SS)
- Dual Capture/Compare/PWM modules plus three timers (vs PIC16C65B-04I/P)
Design Notes
The PIC16C65BT-04E/L operates from 2.5 V to 5.5 V with typical 5 V supply. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of each VDD pin (two VDD pins: 10 and 40), plus a bulk 10 uF tantalum or electrolytic capacitor at the board power entry. Brown-out Reset threshold is approximately 4.0 V at 5 V nominal; ensure supply rise time is faster than the BOR detection window to avoid spurious resets on power-up.
Place the external crystal (typically 4 MHz fundamental) within 10 mm of OSC1 and OSC2 pins (12 and 13). Use 15-33 pF loading capacitors per Microchip's oscillator design guide, matched to the crystal's load specification. Keep oscillator traces short and surrounded by ground pour to minimize EMI radiation and susceptibility. For noisy environments, consider a four-pin crystal module instead of a discrete resonator.
Reserve RB6 (pin 28) and RB7 (pin 29) for In-Circuit Serial Programming (ICSP) - they double as PGC and PGD during programming. Route these signals to an ICSP header with no series resistors, and keep the MCLR/VPP pin (41) accessible with a pull-up to VDD (typically 10 kohm) for normal operation while allowing programmer pull to VPP during programming. Without these provisions, OTP parts cannot be programmed in-circuit.
OTP memory is one-time programmable only - any mis-programmed device must be discarded. Always verify firmware on a Flash-equivalent PIC16F877A first before committing to PIC16C65B production programming. Watchdog Timer (WDT) is enabled by configuration fuse - if enabled, the WDT must be cleared via CLRWDT in all main loops, or the MCU will reset every ~18 ms (default postscaler).
Compliance Information
RoHS and REACH compliance status not stated in the verified web data; the automotive extended temperature grade (-40C to +125C) suggests automotive use, but AEC-Q100 qualification is not confirmed in the datasheet excerpt provided. For automotive safety-critical applications, request Microchip's PPAP and qualification certificates directly.
