PIC16C65B-04I/L - 8-Bit 4MHz OTP MCU, 7KB | Microchip
N.º da peça: PIC16C65B-04I/L ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.2 | $8,20 |
| 10 | $7.4 | $74,00 |
| 100 | $6.55 | $655,00 |
| 500 | $5.9 | $2.950,00 |
| 1.000 | $5.3 | $5.300,00 |
PIC16C65B-04I/L Visão geral
What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a microcontroller that processes 8-bit data words and uses one-time-programmable non-volatile memory for program storage. OTP means each bit cell can be programmed once but cannot be electrically erased, which lowers die cost versus Flash while still delivering non-volatile code retention. In the broader hierarchy: microcontroller -> 8-bit MCU -> OTP (one-time-programmable) memory MCU -> embedded controller -> semiconductor. The PIC16CXX mid-range family was historically the workhorse of the PIC ecosystem, bridging early EPROM PICs (16C5x) and later Flash-based PIC16F parts.
Key features of the PIC16C65B-04I/L include a 4 MHz maximum clock input, 200 ns instruction cycle, 7KB OTP program memory, 192 bytes of RAM, 33 I/O pins, and an industrial temperature grade (-40C to +85C) signified by the 'I' suffix. The 44-pin PLCC ('L') package is a plastic leaded chip carrier with J-leads, suitable for through-hole sockets and through-hole PCB assembly, which remains common in factory automation, motor control boards, and legacy instrumentation. The '04' suffix indicates the 4 MHz speed grade.
Architecturally, the PIC16C65B uses a Harvard RISC core with separate program and data buses, a 14-bit instruction word, and a 35-instruction set that simplifies firmware development. Peripherals on this mid-range core typically include three timers (Timer0/1/2), a Capture/Compare/PWM (CCP) module, a USART for asynchronous serial communication, and an 8-bit ADC. The wide operating voltage range (2.5V to 6.0V) and low-power SLEEP mode make it suited for both line-powered and battery-influenced designs.
Typical applications include industrial control panels, HVAC fan/blower controllers, motor-drive interfaces, vending machine controllers, automotive body electronics subsystems (non-safety), instrumentation front-ends, and legacy embedded upgrades where drop-in replacement of older PIC16C6x/7x devices is required. Engineers often choose it for long-life industrial platforms because OTP-programmed parts ship with locked firmware and require no in-field reprogramming.
Design consideration: OTP parts cannot be reprogrammed, so verify firmware with a windowed/UV-erasable PIC16C65B-04I/PJW variant or an equivalent Flash-based PIC16F876A (in PLCC-44 adapter) during development. Brown-out reset (BOR) and watchdog timer (WDT) configurations should be locked at programming time; once programmed they cannot be re-enabled.
This page synthesizes distributor pricing, drop-in PLCC-44 alternatives, and practical design notes not collected in a single place in the Microchip datasheet.
Alternativas drop-in para PIC16C65B-04I/L — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC16C65B-04I/L (mesmo formato e footprint) — diferindo em Package, Mounting Type, Timers, Program Memory Type, Core.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC16C65B-04I/PT
✅ Drop-In✓ Em estoque
$7.1 / unidade
Ver ficha técnica →PIC16C65B-04E/L
✅ Drop-In✓ Em estoque
$10.85 / unidade
Ver ficha técnica →PIC16C65B-04/PQ
✅ Drop-In✓ Em estoque
$10.25 / unidade
Ver ficha técnica →PIC16C65B-04E/PQ
✅ Drop-In✓ Em estoque
$11.1 / unidade
Ver ficha técnica →PIC16C65B-04/L
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16C65B-04I/PQ
✅ Drop-In✓ Em estoque
$5.45 / unidade
Ver ficha técnica →PIC16C65B-04I/L Classificações máximas e características elétricas
| Family | PIC16CXX mid-range |
| Core | 8-bit RISC Harvard |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM | 192 bytes |
| Frequência máxima de clock | 4 MHz |
| Instruction Cycle | 200 ns |
| I/O Pins | 33 |
| Operating Voltage | 2.5 V to 6.0 V |
| Temperatura de operação | -40 C to +85 C (Industrial) |
| Encapsulamento | 44-pin PLCC (16.59 x 16.59 mm) |
| Tipo de montagem | Through-Hole (J-Lead, socket-compatible) |
| Number of Instructions | 35 (single-word) |
| Number of Timers | 3 (Timer0, Timer1, Timer2) |
| Communication Interfaces | USART (SCI), I2C/SPI (AUSART) |
| CCP Modules | 1 (Capture/Compare/PWM) |
| Watchdog Timer | Yes (WDT, software-enabled) |
| Brown-out Reset | Yes (BOR) |
| Speed Grade Suffix | 04 = 4 MHz |
| Temperature Grade Suffix | I = Industrial (-40 C to +85 C) |
| Package Suffix | L = 44-pin PLCC |
Configuração de pinos do PIC16C65B-04I/L
| Pino 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pino 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pino 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pino 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pino 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / Voltage reference |
| Pino 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pino 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / Slave Select |
| Pino 8 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Pino 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| Pino 10 | RE2/CS/AN7 — PORTE bit 2 / Chip Select / Analog input 7 |
| Pino 11 | VDD — Positive supply voltage |
| Pino 12 | VSS — Ground |
| Pino 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Pino 14 | OSC2/CLKOUT — Oscillator output / clock output |
| Pino 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pino 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pino 17 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Pino 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pino 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pino 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pino 21 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pino 22 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pino 23 | VSS — Ground |
| Pino 24 | VDD — Positive supply voltage |
| Pino 25 | RB0/INT — PORTB bit 0 / External interrupt |
| Pino 26 | RB1 — PORTB bit 1 |
| Pino 27 | RB2 — PORTB bit 2 |
| Pino 28 | RB3 — PORTB bit 3 |
| Pino 29 | RB4 — PORTB bit 4 |
| Pino 30 | RB5 — PORTB bit 5 |
| Pino 31 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pino 32 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pino 33 | VSS — Ground |
| Pino 34 | VDD — Positive supply voltage |
| Pino 35 | RD0 — PORTD bit 0 |
| Pino 36 | RD1 — PORTD bit 1 |
| Pino 37 | RD2 — PORTD bit 2 |
| Pino 38 | RD3 — PORTD bit 3 |
| Pino 39 | RD4 — PORTD bit 4 |
| Pino 40 | RD5 — PORTD bit 5 |
| Pino 41 | RD6 — PORTD bit 6 |
| Pino 42 | RD7 — PORTD bit 7 |
| Pino 43 | VSS — Ground |
| Pino 44 | VDD — Positive supply voltage |
Aplicações típicas
PIC16C65B-04I/L é adequado para 6 aplicaçãos: Industrial Control Panel Logic, HVAC Fan and Blower Controllers, Vending Machine Controllers, Automotive Body Electronics (Non-Safety), Legacy Instrumentation Front-Ends, Irrigation and Greenhouse Controllers.
Industrial Control Panel Logic
The PIC16C65B-04I/L is well suited for industrial control panel logic where locked firmware, industrial temperature grade, and a through-hole socketable package matter. With 7KB of OTP program memory and 192 bytes of RAM, it can host state machines for relay sequencing, button debouncing, and indicator LED multiplexing without external memory. Its 33 I/O pins directly drive panel-mounted switches, pilot lamps, and 7-segment displays through current-limiting resistors. The 44-pin PLCC package slips into a machined-pin socket for field serviceability, and the 4 MHz clock is sufficient for scan-loop polling rates well below 1 ms. Compared with surface-mount Flash parts, the OTP PIC16C65B is cheaper at volume and prevents unauthorized firmware reads, which is critical when the panel logic is a competitive differentiator.
Recomendado
HVAC Fan and Blower Controllers
In HVAC blower and fan-speed controllers, the PIC16C65B-04I/L drives a triac-fired AC motor through its Capture/Compare/PWM module, varying duty cycle to regulate airflow. The 200 ns instruction cycle is fast enough for zero-cross detection and closed-loop RPM control via tachometer feedback on a CCP capture pin. Its 2.5V to 6.0V operating range accepts rectified 5V rails commonly used in HVAC electronics, while the -40 C to +85 C industrial grade tolerates rooftop and basement unit enclosures. The OTP-programmed firmware locks in safety limits (overcurrent trip, brown-out restart) so the controller cannot be reflashed in the field, which simplifies UL 1995 compliance for heating equipment. The PLCC-44 footprint also eases assembly at contract manufacturers who still use wave soldering.
Recomendado
Vending Machine Controllers
The PIC16C65B-04I/L fits the bill as a vending machine MDB / coin-changer controller, where cost-sensitive OEMs lock firmware in OTP to prevent tampering. Its USART handles MDB protocol to bill validators and coin acceptors at 9600 baud, while 33 I/O pins read keypad matrices, drive multi-character 7-segment displays, and energize vend motors via Darlington arrays. With 192 bytes of RAM it tracks credit, selection, and escrow state without external SRAM, and the 7KB OTP holds full pricing tables and audit logs in code memory. The industrial temperature grade survives vending-machine cabinet interiors that easily reach 60 C in summer sun. Socketing the PLCC-44 also lets service technicians swap pre-programmed parts for SKU changes.
Recomendado
Automotive Body Electronics (Non-Safety)
For non-safety body electronics such as seat controllers, mirror positioners, and accessory lighting timers, the PIC16C65B-04I/L's industrial temperature grade handles the under-dash thermal environment. The 33 digital I/O pins read switch inputs from the door module and drive MOSFETs controlling seat motors and mirror actuators through PWM signals generated by the on-chip CCP module. Its 4 MHz operation leaves headroom for switch-debounce timers and lamp fade-in algorithms, and the OTP memory prevents unauthorized reflashing of body-control calibrations. Designers must add external watchdog supervision and load-dump protection at the supply rail; the PIC16C65B is not AEC-Q100 qualified, so mission-critical ECUs require the automotive-grade PIC16F877A-I/PT or PIC18F alternatives.
Recomendado
Legacy Instrumentation Front-Ends
Bench-top instruments and data-acquisition front-ends from the late 1990s and early 2000s used the PIC16C65B-04I/L as the front-panel scan controller. Its 8-bit ADC multiplexed through the 33 I/O pins reads front-panel potentiometers, range-select switches, and status LEDs, while the USART streams formatted readings to a host PC or external display. The 7KB OTP holds calibration tables and front-panel state machines, while the 192-byte RAM buffers measurement bursts between transmissions. The through-hole PLCC-44 package allows easy replacement on legacy boards that are still in service 20+ years later; field-service technicians can swap a programmed unit without reprogramming tools. For modern equivalents, the PIC16F877A-I/L provides identical I/O with Flash reprogrammability.
Recomendado
Irrigation and Greenhouse Controllers
Greenhouse and irrigation controllers use the PIC16C65B-04I/L to time solenoid valves, log soil-moisture sensor inputs, and drive LCD displays that show zone status. The PIC16C65B's Capture/Compare/PWM module generates precise 1-second irrigation pulses and the USART talks to an external moisture sensor via AUSART. Its industrial temperature grade handles greenhouse interior conditions up to 70 C with full sun load, while the -40 C cold-start rating supports unheated outbuildings in winter. The 7KB OTP program memory stores the seasonal watering schedule and crop-specific calibration constants that the OEM does not want modified by the end user. Socketing the PLCC-44 lets dealers swap pre-programmed units when a grower adds new zones.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC16C65B-04I/L — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC16C65B-04I/PT | PIC16C65B-04E/L | PIC16C65B-04/PQ | PIC16C65B-04E/PQ | PIC16C65B-04/L |
|---|---|---|---|---|---|---|
| Package | 44-pin PLCC (16.59x16.59 mm) | 44-pin PLCC (16.59x16.59 mm) - same | 44-pin PLCC (16.59x16.59 mm) - same | 44-pin PLCC (16.59x16.59 mm) - same | 44-pin PLCC (16.59x16.59 mm) - same | 44-pin PLCC (16.59x16.59 mm) - same |
| Brand | Microchip Technology | Microchip Technology - same brand | Microchip Technology - same brand | Microchip Technology - same brand | Microchip Technology - same brand | Microchip Technology - same brand |
| Maximum Clock Frequency | 4 MHz | 4 MHz - same | 4 MHz - same | 4 MHz - same | 4 MHz - same | 4 MHz - same |
| Program Memory Type | 7 KB OTP | 7 KB OTP - same | 7 KB OTP - same | 7 KB OTP - same | 7 KB OTP - same | 7 KB OTP - same |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | 0 C to +70 C (Commercial) | -40 C to +125 C (Extended) | 0 C to +70 C (Commercial) |
| RAM | 192 bytes | 192 bytes - same | 192 bytes - same | 192 bytes - same | 192 bytes - same | 192 bytes - same |
| I/O Pins | 33 | 33 - same | 33 - same | 33 - same | 33 - same | 33 - same |
| Operating Voltage | 2.5 V to 6.0 V | 2.5 V to 6.0 V - same | 2.5 V to 6.0 V - same | 2.5 V to 6.0 V - same | 2.5 V to 6.0 V - same | 2.5 V to 6.0 V - same |
| Lifecycle Status | Active | Active | Active | Active | Active | Active |
| Pin-to-Pin Compatible | Reference | Yes - same PLCC-44 die | Yes - same PLCC-44 die | Yes - same PLCC-44 die | Yes - same PLCC-44 die | Yes - same PLCC-44 die |
Principais diferenciais
- Industrial temperature grade on a long-lifecycle OTP core (vs PIC16C65B-04/L (Commercial))
- PLCC-44 package preserves socketed legacy footprint (vs PIC16F877A-I/P (DIP-40))
- 4 MHz speed grade with lowest dynamic power for battery-backed designs (vs PIC16C65B-20/L (20 MHz))
Notas de projeto
The PIC16C65B-04I/L has multiple VDD/VSS pins (11/24/34/44 are VDD, 12/23/33/43 are VSS) that must all be connected to maintain supply integrity. Estimated: at 4 MHz and 5 V the core draws roughly 2 to 5 mA, so a 100 nF decoupling cap on each VDD/VSS pair and a single 10 uF bulk cap near the package is recommended. The PIC16C65B does not require a regulated 3.3 V supply; any clean 2.5 V to 6.0 V rail is acceptable, and a LM7805 or MCP1700 is typically used. Apply a power-on reset rise time of 0.05 V/ms to 2 V/ms to ensure the internal POR circuit releases cleanly into the reset vector.
For the 44-pin PLCC package, mount the IC in a polarized PLCC socket (Aries or 3M) to allow field replacement and easy programming off-board. Keep the oscillator traces (OSC1, OSC2) shorter than 20 mm and route them over a continuous ground pour to avoid stray pickup. Place the MCLR/VPP pull-up (typically 10 kohm) close to pin 1 with a 100 nF cap to VSS for noise immunity; a noisy MCLR causes spurious resets. If using the 4 MHz ceramic resonator with built-in caps, choose the three-terminal type (e.g. Murata CSTLS) so external load capacitors are unnecessary.
OTP program memory cannot be erased or rewritten. A single bad bit during programming bricks the part, so always verify with a windowed/UV-erasable PIC16C65B-04I/PJW during development, or use the Flash-based PIC16F877A-I/L in a PLCC-44 socket as a development surrogate. Configuration bits are also OTP and lock forever once programmed; set BOREN, WDTEN, and PWRTEN during the prototype phase and never change them on the production programmer. According to the Microchip datasheet, VPP high-voltage programming must be applied to pin 1 (MCLR) before VDD, in that order, or the device enters high-voltage mode without enabling programming.
The PIC16C65B-04I/L has no internal hysteresis on the MCLR/VPP pin, so use a 10 kohm pull-up to VDD with a parallel 100 nF cap to filter transient noise on long reset traces. For USART lines (RC6/TX, RC7/RX), add 100 ohm series resistors near the MCU to damp ringing on cables longer than 50 mm. If using the AUSART for RS-485, add a 120 ohm termination at each cable end. For I2C on RC3/RC4 (SCL/SDA), use 4.7 kohm pull-ups to VDD for 5V/400 kHz operation; for 100 kHz a 10 kohm pull-up is acceptable.
Informações de conformidade
Compliance flags were not present in the verified web data. The PIC16C65B predates many modern compliance programs; check the Microchip product page PCN archive for the latest lead-free and RoHS transition information. Not AEC-Q100 qualified - automotive designs should use AEC-Q100 qualified PIC16F or PIC18F equivalents.
