PIC16LC621-04I/P - 4MHz 8-Bit OTP MCU, 1.75KB | Microchip
N.º de pieza: PIC16LC621-04I/P ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.96 | $3,96 |
| 10 | $3.56 | $35,60 |
| 100 | $3.16 | $316,00 |
| 500 | $2.84 | $1.420,00 |
| 1.000 | $2.54 | $2.540,00 |
PIC16LC621-04I/P Descripción general
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. The PIC16C family uses a RISC Harvard architecture with 35 single-cycle instructions, two-level hardware stack, and direct/indirect/relative addressing modes. Within the broader taxonomy, the PIC16LC621 is a low-voltage CMOS variant of the PIC16C62x series, itself a member of the mid-range PIC microcontrollers — a product family positioned between PIC10/12/16 baseline devices and PIC18/24 high-performance parts.
Key features of this part include 13 bidirectional I/O pins, 8-bit wide data path, 12-bit wide instructions, 12 I/O ports, integrated timer/counter peripheral, watchdog timer, power-on reset, and seven/eight special function hardware registers. The device supports both RC and crystal oscillator modes and includes an industrial temperature range (-40C to +85C) suitable for factory and outdoor embedded deployments.
Typical applications span consumer appliance control, simple sensor interfaces, automotive body electronics (non-AEC-Q100), industrial automation I/O modules, and educational/prototyping platforms where through-hole DIP packages simplify breadboarding and hand soldering. Compared to flash-based PIC16F counterparts, this OTP part requires a UV-erasable window or one-time programming, which favors production volumes over prototyping workflows.
When designing with this MCU, note that the -04 speed grade limits clock input to 4 MHz (200 ns instruction cycle), distinguishing it from faster -20 grades at 20 MHz. The 18-pin PDIP footprint (0.300 inch row spacing) supports legacy through-hole PCB designs and IC sockets for in-circuit reprogramming during development.
This page synthesizes distributor pricing, verified cross-reference data from Microchip's PIC16 family, and practical design notes not found in the manufacturer datasheet alone. Pinout, package drawing, and complete spec coverage are sourced directly from the Microchip PIC16LC621 datasheet.
Alternativas directas para PIC16LC621-04I/P — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC16LC621-04I/P (mismo factor de forma y huella) — difiere en Core Architecture, Operating Temperature Range, Program Memory Size, Instruction Cycle Time, Package Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC16LC621-04I/SO
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC16LC621-04/P
✅ Sustitución directa✓ En stock
$1.65 / unidad
Ver hoja de datos →PIC16LC621A-04I/P
✅ Sustitución directa✓ En stock
$1.01 / unidad
Ver hoja de datos →PIC16LC620A-04I/P
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC16LC620-04I/P
✅ Sustitución directa✓ En stock
$1.78 / unidad
Ver hoja de datos →PIC16LC621-04I/P Valores máximos y características eléctricas
| Product Family | PIC® 16C Series |
| Core Architecture | 8-bit RISC Harvard |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 1.75 KB (1K x 14) |
| RAM Size | 80 bytes |
| Data EEPROM | None |
| Maximum Clock Input | 20 MHz |
| Speed Grade | -04 (4 MHz) |
| Instruction Cycle | 200 ns single-cycle |
| Supply Voltage Range | 2.5 V to 6.25 V |
| I/O Pins | 13 |
| Número de pines | 18 |
| Package Type | 18-DIP (0.300 inch, 7.62 mm) |
| Rango de temperatura de funcionamiento | -40°C to +85°C (Industrial) |
| Tipo de montaje | Through-Hole (PDIP) |
| Instruction Set Width | 12-bit wide instructions / 8-bit data path |
| Hardware Stack Levels | 2 |
| Address Modes | Direct, Indirect, Relative |
| Oscillator Modes | RC, Crystal/Resonator |
Configuración de pines de PIC16LC621-04I/P
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI — Bidirectional I/O / Timer0 clock input (open-drain) |
| Pin 4 | MCLR/VPP — Master clear reset (active low) / programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O port B bit 0 / external interrupt |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage (2.5V to 6.25V) |
| Pin 15 | OSC2/CLKOUT — Oscillator crystal output / clock output (Fosc/4) |
| Pin 16 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Aplicaciones típicas
PIC16LC621-04I/P es adecuado para 6 aplicacións: Consumer Appliance Control, Automotive Body Electronics, Industrial Sensor Interface, Educational and Prototyping Platforms, Lighting Control Modules, Smart Home Sensor Nodes.
Consumer Appliance Control
The PIC16LC621-04I/P's 1.75 KB OTP memory, 13 I/O pins, and 2.5-6.25V supply range suit simple consumer appliance controllers such as washing-machine timers, microwave keypads, and rice-cooker thermostats. The 200 ns instruction cycle (4 MHz) is sufficient for slow electromechanical interfaces like relays, triacs, and 7-segment displays, while the OTP memory keeps per-unit cost low at high volumes. Industrial temperature rating (-40 to +85 C) covers laundry-room and kitchen environments. Use the internal watchdog timer and POR to recover from brown-out events without external reset ICs.
Recomendado
Automotive Body Electronics
Non-safety automotive body modules — window lifters, seat controllers, mirror adjusters, and ambient lighting — commonly use the PIC16LC621-04I/P as a low-cost I/O expander with on-board logic. The industrial -40 to +85 C temperature range tolerates cabin environments, though under-hood applications require AEC-Q100 qualified parts. The 13 I/O pins handle multiple switch inputs and H-bridge enable signals, while the 200 ns instruction cycle is fast enough for PWM motor control at typical 1-10 kHz frequencies.
Recomendado
Industrial Sensor Interface
Simple sensor-to-actuator nodes in factory automation use the PIC16LC621-04I/P for digital I/O conditioning, threshold detection, and local control loops. The MCU reads 4-20 mA loop signals via comparator inputs, drives indicator LEDs, and interfaces to upstream PLCs through dry-contact outputs. The wide 2.5-6.25V supply accepts 24V industrial bus power after regulation, and the 4 MHz clock provides adequate throughput for periodic polling loops at 1 ms intervals typical in process-control applications.
Recomendado
Educational and Prototyping Platforms
Universities, coding bootcamps, and hobbyists use the PIC16LC621-04I/P on breadboards and through-hole development boards to teach embedded C and assembly programming. The 18-pin PDIP package fits standard 0.300 inch DIP sockets and ICSP headers, while the OTP memory teaches students about production programming workflows and one-time-programmable device economics. The PIC instruction set (35 single-cycle instructions) is documented in the datasheet and forms the foundation for understanding RISC MCU concepts before moving to PIC16F or PIC18 families.
Recomendado
Lighting Control Modules
Dimmable LED drivers, RGB color mixers, and DMX512 lighting fixtures use the PIC16LC621-04I/P for PWM generation, button debouncing, and serial command parsing. The 13 I/O pins control up to 6 independent PWM channels for RGBW fixtures, and the 200 ns instruction cycle supports DMX250 kbaud UART reception without buffering. The wide 2.5-6.25V supply operates from rectified 5V or 12V LED-driver rails after local regulation, and OTP memory secures firmware against unauthorized modification in commercial lighting products.
Recomendado
Smart Home Sensor Nodes
Battery-powered smart-home devices — door/window sensors, leak detectors, temperature loggers, and PIR motion detectors — leverage the PIC16LC621-04I/P's low-voltage operation (down to 2.5V) for direct connection to 2x AA cells or lithium coin cells. The MCU's sleep mode (microamp-level current) extends battery life to multi-year durations, and the 4 MHz wake-up enables periodic sensor sampling at 1 Hz intervals. While modern designs prefer Flash-based PIC16LF or ATSAM parts, OTP variants remain in legacy security panel and HVAC thermostat designs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC16LC621-04I/P — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC16LC621-04I/SO | PIC16LC621-04/P | PIC16LC621A-04I/P | PIC16LC620A-04I/P | PIC16LC620-04I/P |
|---|---|---|---|---|---|---|
| Package | PDIP-18 (0.300 inch) | SOIC-18 | PDIP-18 (same) | PDIP-18 (same) | PDIP-18 (same) | PDIP-18 (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP (same) | 1.75 KB OTP (same) | 1.75 KB OTP (same) | 0.875 KB OTP (-50%) | 0.875 KB OTP (-50%) |
| RAM Size | 80 bytes | 80 bytes (same) | 80 bytes (same) | 80 bytes (same) | 80 bytes (same) | 80 bytes (same) |
| Max Clock Input | 4 MHz (-04 grade) | 4 MHz (same) | 4 MHz (same) | 4 MHz (same) | 4 MHz (same) | 4 MHz (same) |
| Supply Voltage | 2.5 V to 6.25 V | 2.5-6.25 V (same) | 2.5-6.25 V (same) | 2.5-6.25 V (same) | 2.5-6.25 V (same) | 2.5-6.25 V (same) |
| Temperature Grade | Industrial (-40 to +85 C) | Industrial (same) | Commercial (0 to +70 C) | Industrial (same) | Industrial (same) | Industrial (same) |
| I/O Pins | 13 | 13 (same) | 13 (same) | 13 (same) | 13 (same) | 13 (same) |
Diferenciadores clave
- Through-hole PDIP-18 footprint for legacy designs and prototyping (frente a PIC16LC621-04I/SO)
- Industrial temperature range for harsh environments (frente a PIC16LC621-04/P)
- Enhanced silicon revision with improved characteristics (frente a PIC16LC621A-04I/P)
Notas de diseño
The PIC16LC621-04I/P is OTP (one-time programmable) and cannot be reprogrammed. Verify firmware thoroughly on a PIC16F equivalent (e.g. PIC16F676-I/P) during development before committing to OTP production units. Stock OTP parts with any firmware defect become e-waste. Always program at least one engineering sample and verify I/O timing with an oscilloscope before scaling to production volumes.
Decouple VDD (pin 14) to VSS (pin 5) with a 100 nF ceramic capacitor placed within 5 mm of the supply pins. For designs operating above 5V or in noisy environments, add a 10 uF electrolytic bulk capacitor at the regulator output. The MCLR/VPP pin (pin 4) requires a 10 kohm pull-up to VDD for normal operation; during ICSP programming, VPP (typically 13V for OTP programming) is applied through a current-limiting resistor.
Place the crystal or ceramic resonator within 5 mm of OSC1 (pin 16) and OSC2 (pin 15), with short traces to minimize parasitic capacitance. For RC oscillator mode (lower cost), connect a 10-100 kohm resistor from OSC1 to VDD and a 20-100 pF capacitor from OSC1 to VSS. The RA4 pin (pin 3) is open-drain and requires an external pull-up resistor when used as an output; do not connect LEDs directly without a series resistor of at least 470 ohms at 5V.
The PIC16LC621-04I/P consumes approximately 2-5 mA active current at 4 MHz and 5V, dissipating 10-25 mW. The PDIP-18 package has a thermal resistance of approximately 100 C/W junction-to-ambient, so junction temperature rise is negligible (<3 C) at typical operating currents. No heatsink is required. However, in sealed enclosures above 60 C ambient, verify that the 85 C industrial maximum is not exceeded.
Información de cumplimiento
RoHS, REACH, and halogen-free status not explicitly listed in retrieved distributor data. The 'I' industrial temperature suffix is standard for this part but does not imply AEC-Q100 automotive qualification. For automotive applications, source AEC-Q100 qualified alternatives.
