PIC16C65B-20E/L - 8-Bit 20MHz CMOS OTP MCU, 7KB EPROM, PLCC-44
MPN: PIC16C65B-20E/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.59 | $10.59 |
| 10 | $9.8 | $98.00 |
| 100 | $8.95 | $895.00 |
| 500 | $8.2 | $4,100.00 |
| 1,000 | $7.65 | $7,650.00 |
PIC16C65B-20E/L Overview
A PIC16CXX mid-range microcontroller is an 8-bit RISC (Reduced Instruction Set Computer) device that executes most instructions in a single clock cycle, designed for embedded control applications requiring deterministic timing, low power consumption, and integrated peripherals. PIC microcontrollers sit within the broader taxonomy of: microcontroller -> embedded controller -> single-chip computer -> semiconductor IC.
Key features of the PIC16C65B include wide operating voltage range from 2.5V to 6.0V, low-power consumption (typically 15 µA at 5V/4 MHz and 1 µA at 3V/32 kHz), fully static design, and commercial, industrial, and extended temperature ranges. The -20E speed grade designates a 20 MHz maximum oscillator frequency with the extended (E) temperature range, while /L denotes the PLCC-44 lead-form package.
The PIC16C65B architecture uses a 14-bit instruction word with separate program and data buses (Harvard architecture), enabling simultaneous instruction fetch and data access. The device offers 33 single-word instructions and a 15-level deep hardware stack, with up to 8K x 14 words of program memory addressable.
Typical applications include industrial control systems, motor control, instrumentation, automotive subsystems, and embedded control boards requiring parallel-slave-port based host expansion. The wide voltage range and low-power modes make the PIC16C65B well-suited for both line-powered and battery-operated designs.
When designing with this device, note that OTP memory cannot be electrically erased; production programming must be performed before final PCB assembly. Designers targeting field-updateable firmware should consider Flash-based PIC16F family equivalents such as the PIC16F877A in a compatible package footprint.
This page synthesizes verified distributor pricing, same-brand drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, helping engineers rapidly qualify the PIC16C65B-20E/L for both new designs and legacy maintenance.
Drop-in alternatives for PIC16C65B-20E/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 PIC16C65B-20E/L (same form factor and footprint) — differing in Core Architecture, Mounting Type, Program Memory Size, Program Memory Type, Data EEPROM.
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 →PIC16C65B-20I/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$8.4 / Unit
View Datasheet →PIC16C65B-20/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F877A-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F877-20/L
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C65B-20E/L Maximum Ratings & Electrical Characteristics
| Device Family | PIC16CXX mid-range |
| Core Architecture | 8-bit RISC (Harvard) |
| Instruction Word Size | 14-bit |
| Maximum Clock Frequency | 20 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 192 bytes |
| Data EEPROM | None (OTP device) |
| Operating Voltage Range | 2.5 V to 6.0 V |
| Typical Supply Current (5V, 4 MHz) | 15 µA |
| Typical Supply Current (3V, 32 kHz) | 1 µA |
| I/O Pins | 33 |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Capture/Compare/PWM Modules | 2 (CCP) |
| A/D Converter | 8 channels x 8-bit |
| Serial Interfaces | SSP (SPI/I2C) + USART (SCI) |
| Parallel Slave Port | 8-bit |
| Package | PLCC-44 (Leaded Chip Carrier) |
| Mounting Type | Surface Mount (socketed) |
| Operating Temperature Range (E suffix) | -40C to +125C (Extended) |
PIC16C65B-20E/L Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Pin 2 | OSC1/CLKIN — Oscillator crystal input or external clock input |
| Pin 3 | OSC2/CLKOUT — Oscillator crystal output or clock output (Fosc/4) |
| Pin 4 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| Pin 7 | RA3/AN3/VREF — PORTA bit 3 / Analog input channel 3 / ADC reference |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SSP slave select |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage (2.5V to 6.0V) |
| Pin 12 | RB0/INT — PORTB bit 0 / External interrupt input |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3 — PORTB bit 3 |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6/PGC — PORTB bit 6 / In-circuit serial programming clock |
| Pin 19 | RB7/PGD — PORTB bit 7 / In-circuit serial programming data |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output or clock input |
| Pin 23 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 24 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM) output |
| Pin 25 | RC3/SCK/SCL — PORTC bit 3 / SSP SPI clock or I2C clock |
| Pin 26 | RC4/SDI/SDA — PORTC bit 4 / SSP SPI data in or I2C data |
| Pin 27 | RC5/SDO — PORTC bit 5 / SSP SPI data out |
| Pin 28 | RC6/TX/CK — PORTC bit 6 / USART transmit or clock |
| Pin 29 | RC7/RX/DT — PORTC bit 7 / USART receive or data |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RD0/PSP0 — PORTD bit 0 / Parallel slave port bit 0 |
| Pin 33 | RD1/PSP1 — PORTD bit 1 / Parallel slave port bit 1 |
| Pin 34 | RD2/PSP2 — PORTD bit 2 / Parallel slave port bit 2 |
| Pin 35 | RD3/PSP3 — PORTD bit 3 / Parallel slave port bit 3 |
| Pin 36 | RD4/PSP4 — PORTD bit 4 / Parallel slave port bit 4 |
| Pin 37 | RD5/PSP5 — PORTD bit 5 / Parallel slave port bit 5 |
| Pin 38 | RD6/PSP6 — PORTD bit 6 / Parallel slave port bit 6 |
| Pin 39 | RD7/PSP7 — PORTD bit 7 / Parallel slave port bit 7 |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply voltage |
| Pin 42 | RE0/RD/AN5 — PORTE bit 0 / Parallel slave port read control / Analog channel 5 |
| Pin 43 | RE1/WR/AN6 — PORTE bit 1 / Parallel slave port write control / Analog channel 6 |
| Pin 44 | RE2/CS/AN7 — PORTE bit 2 / Parallel slave port chip select / Analog channel 7 |
Typical Applications
PIC16C65B-20E/L is suitable for 7 applications: Industrial Motor Control, Embedded Sensor Monitoring, Host Bus Peripheral Expander, Legacy Automotive Subsystems, Educational and Development Boards, RS-232/RS-485 Communication Bridges, Power Supply and UPS Control.
Industrial Motor Control
The PIC16C65B-20E/L's 20 MHz CPU, dual CCP modules, and 8-bit ADC make it suitable for DC and stepper motor control in industrial automation. With two PWM channels and a 20 MHz instruction cycle (200 ns), the device can generate complementary PWM at frequencies up to ~40 kHz with 10-bit resolution, sufficient for low- to mid-power BLDC and brushed DC drives. The 33 I/O pins allow direct interfacing to gate drivers, Hall-effect sensors, and incremental encoders without external logic.
Recommended
Embedded Sensor Monitoring
With 8 ADC channels, 192 bytes RAM, and ultra-low 1 µA sleep current at 3V/32 kHz, the PIC16C65B-20E/L is well-suited to multi-channel sensor monitoring nodes. The wide 2.5V-6.0V supply range lets it operate directly from a 3.3V or 5V rail or from 4xAA batteries. The 8-bit ADC provides adequate resolution for temperature, light, pressure, and potentiometer readings in HVAC, weather, and process-monitoring applications where cost dominates over ADC precision.
Recommended
Host Bus Peripheral Expander
The PIC16C65B-20E/L's 8-bit Parallel Slave Port (PORTD plus PORTE control lines) lets it act as an intelligent peripheral expander for a host microcontroller or microprocessor. The host writes commands to PORTD and reads status back, while the PIC16C65B handles local I/O, ADC, PWM, and serial communication. This was a common 1990s-2000s design pattern for adding analog and PWM channels to otherwise pure-digital host boards. Combined with the USART and SSP, the device can bridge between parallel and I2C/SPI peripherals.
Recommended
Legacy Automotive Subsystems
The PIC16C65B-20E/L's extended -40C to +125C temperature grade (E suffix) and 5V native operation make it a candidate for legacy automotive body electronics such as instrument clusters, HVAC controls, and lighting modules. The integrated USART enables LIN-bus slave emulation (with external transceiver), and the 33 I/O pins drive segment displays, switches, and indicator LEDs. New automotive designs should migrate to AEC-Q100-qualified PIC18F or dsPIC33 families.
Recommended
Educational and Development Boards
The PIC16C65B-20E/L in PLCC-44 socket is widely used in college embedded-systems courses and retro computing projects, particularly with Microchip's MPLAB IDE and PICSTART Plus programmer. The PLCC-44 socket allows students to swap devices quickly, and the rich peripheral set (ADC, PWM, USART, SSP, PSP) covers most introductory embedded topics. Even though the part is OTP, teaching kits use windowed EPROM variants or reuse pre-programmed devices.
Recommended
RS-232/RS-485 Communication Bridges
The PIC16C65B-20E/L's integrated USART and SSP let it function as a compact protocol bridge between RS-232/RS-485, SPI, and I2C buses. At 20 MHz, the USART supports baud rates up to ~1.25 Mbaud with a 0.8% error margin when using the high-baud-rate generator. With only 192 bytes of RAM, the device is best suited to packet-forwarding or small-frame-protocol conversion rather than high-throughput buffering.
Recommended
Power Supply and UPS Control
The PIC16C65B-20E/L's ADC, PWM, and interrupt-rich architecture support closed-loop control of small offline UPS systems, battery chargers, and DC-DC converters. The 20 MHz CPU executes the control loop in microseconds, and the 8-bit ADC monitors voltage and current with sufficient resolution for battery charging profiles. With OTP memory, firmware revisions require new devices, so production volumes benefit from stable algorithm choices.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C65B-20E/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C65B-04I/L | PIC16C65B-04E/L | PIC16C65B-20/L | PIC16F877A-I/L | PIC16F877-20/L |
|---|---|---|---|---|---|---|
| Package | PLCC-44 | PLCC-44 - same | PLCC-44 - same | PLCC-44 - same | PLCC-44 - same | PLCC-44 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | |
| Program Memory Type | OTP EPROM (7 KB) | OTP EPROM (7 KB) | OTP EPROM (7 KB) | Flash (14 KB) | Flash (8 KB) | |
| Maximum Clock Frequency | 20 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz | |
| Operating Voltage Range | 2.5V to 6.0V | 2.5V to 6.0V | 2.5V to 6.0V | 2.0V to 5.5V | 2.0V to 5.5V | |
| Temperature Range | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 368 bytes | 368 bytes | |
| A/D Converter | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 10-bit | 8 ch x 10-bit | |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Active (mature) | Obsolete | |
| Approx. Price @ 1pc | $10.59 | $8-10 (secondary market) | $8-10 (secondary market) | $5-7 (active stock) | $6-9 (secondary market) |
Key Differentiators
- Lowest-cost PLCC-44 drop-in for cost-sensitive legacy designs (vs PIC16F877A-I/L)
- Extended -40C to +125C temperature grade in PLCC-44 (vs PIC16C65B-20/L)
- Rich peripheral set with parallel slave port (vs PIC16C65A-04E/L)
Design Notes
The PIC16C65B is OTP (One-Time Programmable) EPROM: once a bit is programmed to 0 it cannot be returned to 1. There is no in-circuit reprogramming for production devices. For development, use the PIC16C65B JW (windowed) ceramic package variant with UV erasure, or migrate to the pin-compatible Flash-based PIC16F877A-I/L which supports ICSP (In-Circuit Serial Programming) via PGC/RB6 and PGD/RB7. Attempting to re-program an OTP device will permanently corrupt the firmware image.
The PIC16C65B has four VDD/VSS pin pairs on the PLCC-44 (pins 11/10, 21/20, 31/30, 41/40) that MUST all be connected. Omitting any pair causes voltage droop on the internal logic and can result in unreliable operation or POR (Power-On Reset) misfires under load. Place a 100 nF decoupling capacitor close to each VDD pin, plus a single 10 µF bulk capacitor at the package entry point.
For ADC accuracy, isolate the analog VDD/VSS pins (if your board uses separate analog supply) and add a small RC low-pass filter on the analog VREF source. When using the ADC in noisy environments, place the device in SLEEP mode during conversion (RCON.ADCS=1, clock from internal RC) to eliminate CPU switching noise coupling into the analog inputs. Reference the Microchip PIC16C6X datasheet section on 'ADC Design Considerations'.
The PIC16C65B's Parallel Slave Port (PORTD + PORTE control lines) shares pins with the analog inputs AN5-AN8 and the I/O PORTE. When using the PSP, ensure the AN5-AN7 bits in the ADCON1 register are configured as digital I/O (PCFG bits set to non-analog mode) to avoid contention with the ADC multiplexer. The PSP read/write/chip-select strobes (RE0/RE1/RE2) require the TRISE register to be correctly set for control (not data) direction.
The PIC16C65B-20E/L in PLCC-44 has an estimated theta_JA of ~50 C/W on a 4-layer JEDEC test board. In Extended temperature (-40C to +125C) operation at full 20 MHz with all peripherals active, total supply current can approach 25-30 mA, yielding ~150 mW dissipation. Thermal derating is rarely critical for this part at typical industrial environments, but verify with the Microchip PIC16C6X thermal characterization data if mounting in sealed enclosures without airflow.
Compliance Information
Compliance flags not provided in verified web data; set to 'unknown' per Data Authenticity Rules. The PIC16C65B-20E/L is an obsolete Microchip part; RoHS/REACH compliance data should be confirmed directly via Microchip product page or certificate of conformance before use in new designs.
