ATMEGA32L-8MUR - 8-bit AVR MCU 32KB Flash 8MHz | Microchip
N.º de pieza: ATMEGA32L-8MUR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $7.35 | $7,35 |
| 10 | $6.65 | $66,50 |
| 100 | $5.95 | $595,00 |
| 500 | $5.4 | $2.700,00 |
| 1.000 | $4.95 | $4.950,00 |
ATMEGA32L-8MUR Descripción general
An 8-bit microcontroller (MCU) is an integrated circuit that combines a processor core, memory, and peripherals on a single chip, executing one byte of data per instruction cycle. The ATmega family belongs to the broader microcontroller hierarchy: MCU -> embedded processor -> semiconductor IC. AVR devices use a Harvard architecture with a RISC instruction set, allowing most instructions to execute in a single clock cycle.
Key features include the AVR advanced RISC architecture with 131 powerful instructions, 32 general purpose working registers, in-system programmable (ISP) flash with read-while-write capability, and a JTAG interface for boundary-scan and on-chip debugging. The -8M suffix denotes an 8MHz speed grade; the L suffix denotes a low-voltage operating range suitable for battery-powered designs.
The device integrates 8-channel 10-bit ADC peripherals, an SPI serial port, a TWI (I2C-compatible) interface, a USART, PWM channels, an analog comparator, and a watchdog timer, providing a complete embedded control system on one chip. Four software-selectable power-saving modes support low-power applications.
Typical applications include industrial automation and control, embedded sensing nodes, HVAC and building control, and consumer appliances where 5V-tolerant I/O and proven AVR architecture are valued.
Design consideration: choose this 8MHz L-grade part when operating at lower supply voltages; if a 16MHz, 5V design is required, the ATMEGA32A family variant is the appropriate successor, as Microchip directs new designs to the newer ATMEGA32A.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-17.
Alternativas directas para ATMEGA32L-8MUR — 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 ATMEGA32L-8MUR (mismo factor de forma y huella) — difiere en Package, Throughput, Timers/Counters.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATMEGA32L-8MI
✅ Sustitución directa✓ En stock
$6.08 / unidad
Ver hoja de datos →ATMEGA32A-MU
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ATMEGA32L-8MUR Valores máximos y características eléctricas
| Core Architecture | AVR 8-bit RISC |
| Core Speed | 8 MHz |
| Flash Memory | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Operating Voltage Range | 2.7 V to 5.5 V |
| Number of I/O | 32 general purpose I/O lines |
| General Purpose Working Registers | 32 |
| Instruction Set | 131 powerful instructions, mostly single-cycle |
| Debug Interface | JTAG (boundary-scan and on-chip debug) |
| Programming | ISP (in-system programmable), read-while-write |
| Encapsulado | 44-VQFN (7x7 mm) with exposed pad |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40C to +85C (industrial) |
| Life Cycle Stage | ACTIVE (newer device available: ATMEGA32A) |
Guía de configuración de pines de ATMEGA32L-8MUR 44-vqfn (7x7 mm) with exposed pad
Configuración de pines para ATMEGA32L-8MUR (encapsulado 44-vqfn (7x7 mm) with exposed pad). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para ATMEGA32L-8MUR.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ATMEGA32L-8MUR es adecuado para 6 aplicacións: Industrial Automation and Control, Battery-Powered Embedded Sensing, HVAC and Building Control, Consumer Appliances, Embedded Training and Prototyping, Test and Measurement Fixtures.
Industrial Automation and Control
The ATMEGA32L-8MUR fits industrial control nodes because its 32KB ISP flash holds substantial control firmware, its 32 I/O lines drive relays, indicators, and limit switches directly, and its industrial temperature rating of -40C to +85C covers factory-floor environments. The JTAG interface supports in-system boundary-scan testing and on-chip debugging during production and field service, while the 1KB EEPROM stores configuration and calibration data across power cycles. In a typical PLC-style sensor node, the 8-channel 10-bit ADC reads analog transducers while the USART communicates with supervisory systems; the 8MHz speed grade keeps switching losses low, though designs requiring faster loop rates should consider the 16MHz ATMEGA32A successor.
Recomendado
Battery-Powered Embedded Sensing
For battery-powered sensing nodes, the L-grade ATMEGA32L-8MUR is attractive because its low-voltage operating range allows direct operation from lithium or multi-cell alkaline supplies without a boost converter, and its 8MHz speed grade reduces dynamic switching current. The AVR architecture provides multiple software-selectable sleep modes, so the MCU can duty-cycle between active sampling and deep sleep to stretch battery life; the 1KB EEPROM preserves sensor calibration across battery swaps. With 32 I/O lines, one chip can multiplex several sensors, a local display, and a radio module, and the 10-bit ADC digitizes analog channels without external converters. Firmware over-the-air updates are supported through the read-while-write ISP flash.
Recomendado
HVAC and Building Control
In HVAC controllers and building automation boards, the ATMEGA32L-8MUR supplies the right balance of I/O count and flash capacity: 32KB flash accommodates PID control loops, protocol stacks, and configuration tables, while the 32 I/O lines interface with damper actuators, temperature sensors, and keypad matrices. The 10-bit ADC with internal reference digitizes thermistor and humidity-sensor signals, and the TWI (I2C-compatible) interface links to RTC and EEPROM peripherals for scheduling functions. The industrial temperature range suits rooftop and mechanical-room installations, and the JTAG port enables boundary-scan testing of assembled boards. Watchdog timer support helps controllers recover from firmware lockups without technician intervention.
Recomendado
Consumer Appliances
White goods and small appliances benefit from the ATMEGA32L-8MUR's proven AVR reliability, 5V-tolerant I/O, and integrated peripherals that eliminate external glue logic. The 32 I/O lines directly drive seven-segment displays, touch keys, motor relays, and door switches, while the USART supports service-diagnostics ports. The 1KB EEPROM stores user settings and cycle counters across power interruptions, and the watchdog timer enforces safe recovery from brownouts. Because the L-grade part accepts lower supply voltages, it also serves dual-voltage product platforms sold in multiple regions. Designs migrating to the ATMEGA32A family gain 16MHz headroom and continued manufacturer support, since Microchip positions the ATmega32A as the newer device for new designs.
Recomendado
Embedded Training and Prototyping
The ATmega32 family remains a staple in engineering education because its AVR RISC core, 131 mostly single-cycle instructions, and 32 working registers map cleanly onto assembly-language teaching, and its JTAG interface exposes real on-chip debugging rather than simulator-only workflows. The ATMEGA32L-8MUR's 44-VQFN package suits production-style student PCBs, while DIP-packaged family members support breadboard labs. The 32KB flash is generous enough for multi-module projects combining ADC sampling, SPI peripherals, and UART communication, and the ISP bootloader capability lets students update firmware without a programmer attached after initial setup. Universities and makerspaces also value the abundant community libraries and low-cost development toolchains built around the AVR architecture.
Recomendado
Test and Measurement Fixtures
Bench and production test fixtures use the ATMEGA32L-8MUR as a low-cost controller for relay matrices, analog multiplexers, and pass/fail indicator logic. Its 32 I/O lines switch fixture relays directly, the 10-bit ADC performs go/no-go analog verification, and the JTAG boundary-scan capability lets the same chip validate board-level connectivity of DUTs carrying JTAG chains. The 8MHz clock is sufficient for sequencing operations at human-interaction speeds, and firmware stored in read-while-write flash can be updated in the field as test plans evolve. The industrial temperature rating keeps fixtures stable in unconditioned factory areas, and the exposed-pad VQFN package improves grounding integrity for analog measurement accuracy.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA32L-8MUR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA32L-8MI | ATMEGA32A-MU |
|---|---|---|---|
| Package | 44-VQFN (7x7 mm) exposed pad | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB |
| Maximum Clock Speed | 8 MHz | 8 MHz | 16 MHz |
| Operating Voltage | Low-voltage L-grade range | Low-voltage L-grade range - same | 4.5 V to 5.5 V (higher) |
| Lifecycle Status | Active (ATMEGA32A is newer device) | Active | Active (recommended for new designs) |
Diferenciadores clave
- Low-voltage L-grade operation for battery designs (frente a ATMEGA32A-MU)
- Full 32 I/O lines plus JTAG on a compact 44-pin footprint (frente a ATMEGA328P-MU)
- Trade-off: lower speed grade than successor (frente a ATMEGA32A-MU)
Notas de diseño
The 44-VQFN (7x7) exposed pad must be soldered to a grounded PCB pad array. Design a thermal pad with an array of 3x3 or 4x4 vias connecting to the internal ground plane to ensure reliable grounding and heat dissipation. Because no-lead packages hide their solder joints, use X-ray or boundary-scan (the ATmega32L includes JTAG boundary-scan) inspection at production to detect open power pins. Follow IPC-recommended QFN land-pattern geometry and print solder paste on the thermal pad in segmented apertures to limit voiding.
Decouple VCC and AVCC independently: place 100nF ceramic capacitors directly at each VCC/AVCC pin pair plus one bulk 4.7uF-10uF capacitor near the supply entry. AVCC powers the ADC, so route it through an LC or RC filter (for example 10 ohm series resistor plus 100nF) when ADC accuracy matters, and never let AVCC lag VCC on power-up per AVR supply-sequencing requirements. Tie AREF to a decoupled reference when using the internal reference; do not drive AREF externally while the internal reference is enabled.
The ATmega32L is a legacy device: Microchip's datasheet header states a newer device (ATMEGA32A) is available, so for long-life products plan a second source on the same footprint. Do not clock the L-grade part above 8MHz - the speed grade is tied to the supply voltage range, and exceeding it violates datasheet timing. Ensure RESET has a pull-up (10k) and consider external brownout supervision, since in-system ISP programming requires a stable clock and valid reset level.
Información de cumplimiento
Compliance status was not stated in the provided web data; verify RoHS/REACH status on the official Microchip product page before procurement.