ATMEGA32L-8MJ - 8-bit AVR MCU 32KB Flash 8MHz | Microchip
Référence : ATMEGA32L-8MJ ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.42 | $6,42 |
| 10 | $5.78 | $57,80 |
| 100 | $5.14 | $514,00 |
| 500 | $4.63 | $2 315,00 |
| 1 000 | $4.11 | $4 110,00 |
ATMEGA32L-8MJ Présentation
An AVR microcontroller is a Harvard-architecture 8-bit RISC device that executes most instructions in a single clock cycle, giving roughly 1 MIPS per MHz. Within the product taxonomy it sits at AVR MCU -> 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. The ATmega family is the classic general-purpose AVR line, and the ATmega32 is its 32 KB Flash member with a full peripheral set: 32 general-purpose I/O lines, three flexible timer/counters with compare modes, an 8-channel 10-bit ADC, a programmable watchdog, and a JTAG interface for boundary-scan and on-chip debug.
Key differentiators of the ATMEGA32L-8MJ include its 32 KB self-programming Flash with Read-While-Write, 2 KB SRAM, 1 KB EEPROM, 131 powerful instructions with most executing in a single clock cycle, and 32 general-purpose working registers. The L-suffix low-voltage variant operates from 2.7 V to 5.5 V, making it suitable for battery-powered and 3.3 V systems, while the 44-VQFN (7x7) package with exposed pad saves board area versus the 44-pin TQFP and provides a thermal path.
The device integrates an 8-channel 10-bit successive-approximation ADC, two USARTs, a master/slave SPI, a byte-oriented two-wire serial interface, and an on-chip oscillator with calibration. In-system programming via SPI and JTAG supports field firmware updates without removing the device from the board.
Typical applications include industrial control panels, battery-powered instrumentation, motor control front-ends, consumer appliance controllers, and legacy AVR designs migrating from TQFP to a smaller QFN footprint. The 8 MHz maximum clock at 2.7 V suits low-power sensor nodes where 16 MHz operation is not required.
When designing with this device, note that the 44-VQFN exposed pad must be soldered to a grounded thermal land, and the 8 MHz rating applies across the full 2.7-5.5 V range, whereas 16 MHz parts require at least 4.5 V. Decouple every VCC pin with 100 nF and provide a 10 uF bulk capacitor near the package.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for selection, replacement, and layout decisions.
Alternatives de remplacement direct pour ATMEGA32L-8MJ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA32L-8MJ (même facteur de forme et même empreinte) — différant par Package, ADC, Operating Temperature, RoHS Status, Core Architecture.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA32L-8MU
✅ Remplacement direct✓ En stock
$3.85 / unité
Voir la fiche technique →ATMEGA32-8MJ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA32L-8MI
✅ Remplacement direct✓ En stock
$6.08 / unité
Voir la fiche technique →ATMEGA32L-8AI
✅ Remplacement direct✓ En stock
$5.62 / unité
Voir la fiche technique →ATMEGA32L-8AC
✅ Remplacement direct✓ En stock
$5.85 / unité
Voir la fiche technique →ATMEGA32A-AU
✅ Remplacement direct✓ En stock
$2.95 / unité
Voir la fiche technique →ATMEGA32L-8MJ Valeurs maximales et caractéristiques électriques
| Core Processor | AVR 8-bit RISC |
| Program Memory Size | 32 KB (16K x 16) Flash |
| Program Memory Type | In-System Programmable Flash with Read-While-Write |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Fréquence d'horloge maximale | 8 MHz |
| Operating Voltage Range | 2.7 V to 5.5 V |
| Throughput | Up to 8 MIPS at 8 MHz |
| Instruction Set | 131 powerful instructions, most single-clock cycle |
| General Purpose Working Registers | 32 x 8-bit |
| I/O Lines | 32 programmable I/O lines |
| ADC | 8-channel 10-bit successive approximation |
| Timers | Three flexible timer/counters with compare modes |
| Connectivity | Two USART, SPI, Two-wire Serial Interface (I2C) |
| Debug Interface | JTAG (boundary-scan and on-chip debug) |
| Boîtier | 44-VQFN Exposed Pad (7x7 mm) |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40C to +85C |
| Statut RoHS | Compliant |
Configuration des broches de ATMEGA32L-8MJ
| Broche 1 | PB0 — Port B bit 0 / Timer1 input capture |
| Broche 2 | PB1 — Port B bit 1 / Timer1 PWM output |
| Broche 3 | PB2 — Port B bit 2 / SPI slave select |
| Broche 4 | PB3 — Port B bit 3 / SPI master-out slave-in |
| Broche 5 | PB4 — Port B bit 4 / SPI slave-out master-in |
| Broche 6 | PB5 — Port B bit 5 / SPI clock |
| Broche 7 | PB6 — Port B bit 6 / XTAL2 |
| Broche 8 | PB7 — Port B bit 7 / XTAL1 |
| Broche 9 | RESET — Reset input (active low) |
| Broche 10 | VCC — Digital supply voltage |
| Broche 11 | GND — Ground |
| Broche 12 | XTAL2 — Crystal oscillator output |
| Broche 13 | XTAL1 — Crystal oscillator input |
| Broche 14 | PD0 — Port D bit 0 / USART0 RXD |
| Broche 15 | PD1 — Port D bit 1 / USART0 TXD |
| Broche 16 | PD2 — Port D bit 2 / USART0 RXD (alternate) |
| Broche 17 | PD3 — Port D bit 3 / USART0 TXD (alternate) |
| Broche 18 | PD4 — Port D bit 4 / Timer1 external clock |
| Broche 19 | PD5 — Port D bit 5 / Timer1 PWM output |
| Broche 20 | PD6 — Port D bit 6 / Timer1 PWM output |
| Broche 21 | PD7 — Port D bit 7 / Timer2 PWM output |
| Broche 22 | PC0 — Port C bit 0 / ADC0 |
| Broche 23 | PC1 — Port C bit 1 / ADC1 |
| Broche 24 | PC2 — Port C bit 2 / ADC2 |
| Broche 25 | PC3 — Port C bit 3 / ADC3 |
| Broche 26 | PC4 — Port C bit 4 / ADC4 |
| Broche 27 | PC5 — Port C bit 5 / ADC5 |
| Broche 28 | PC6 — Port C bit 6 / ADC6 |
| Broche 29 | PC7 — Port C bit 7 / ADC7 |
| Broche 30 | AVCC — Analog supply voltage for ADC |
| Broche 31 | GND — Ground |
| Broche 32 | AREF — Analog reference voltage |
| Broche 33 | PA7 — Port A bit 7 / ADC7 (alternate) |
| Broche 34 | PA6 — Port A bit 6 / ADC6 (alternate) |
| Broche 35 | PA5 — Port A bit 5 / ADC5 (alternate) |
| Broche 36 | PA4 — Port A bit 4 / ADC4 (alternate) |
| Broche 37 | PA3 — Port A bit 3 / ADC3 (alternate) |
| Broche 38 | PA2 — Port A bit 2 / ADC2 (alternate) |
| Broche 39 | PA1 — Port A bit 1 / ADC1 (alternate) |
| Broche 40 | PA0 — Port A bit 0 / ADC0 (alternate) |
| Broche 41 | VCC — Digital supply voltage |
| Broche 42 | GND — Ground |
| Broche 43 | TDI — JTAG test data input |
| Broche 44 | TDO — JTAG test data output |
| Broche 45 | TMS — JTAG test mode select |
| Broche 46 | TCK — JTAG test clock |
| Broche 47 | EP — Exposed thermal pad (connect to GND) |
Applications typiques
ATMEGA32L-8MJ convient pour 6 applications: Industrial Control Panels, Battery-Powered Instrumentation, Motor Control Front-Ends, Consumer Appliance Controllers, Legacy AVR Design Migration, Sensor Data Loggers.
Industrial Control Panels
The ATMEGA32L-8MJ fits industrial control panels because its 32 KB Flash holds ladder-logic interpreters and HMI firmware, while 32 general-purpose I/O lines directly drive relays, opto-isolators, and status LEDs without external port expanders. Operating from 2.7 V to 5.5 V, it interfaces cleanly with 5 V sensors and 3.3 V logic on the same board. The 8-channel 10-bit ADC samples potentiometers, thermistors, and 4-20 mA loop shunts at up to 15 kSPS, and the three timer/counters generate PWM for valve and heater control. The 44-VQFN exposed pad solders to a grounded thermal land, keeping the die below 85C in cabinet ambient up to 60C. Two USARTs provide simultaneous Modbus RTU and debug console links, and JTAG boundary-scan simplifies production test.
Recommandé
Battery-Powered Instrumentation
The ATMEGA32L-8MJ is well suited to battery-powered instrumentation because the L-suffix core runs from 2.7 V to 5.5 V, allowing direct operation from a 3.0 V or 3.3 V rail without a boost converter. Multiple sleep modes, including power-down and standby, drop current to microamp levels between measurements, while the 8 MHz maximum clock keeps dynamic power low. The 8-channel 10-bit ADC digitizes strain gauges, thermocouples, and pressure sensors, and the 1 KB EEPROM stores calibration coefficients that survive battery replacement. In-system programming via SPI lets firmware be updated through a pogo-pin fixture without removing the board from the enclosure. The 44-VQFN (7x7 mm) package saves board area compared with a 44-pin TQFP, extending battery life by allowing a smaller cell.
Recommandé
Motor Control Front-Ends
The ATMEGA32L-8MJ serves motor control front-ends by generating complementary PWM with dead-time insertion from its three timer/counters, driving gate drivers for brushed DC and stepper motors. The 8-channel 10-bit ADC samples current-sense shunts and back-EMF dividers, enabling closed-loop speed and torque control at 8 MIPS. Thirty-two I/O lines handle limit switches, encoder inputs, and fault signals without external glue logic. The 2 KB SRAM buffers commutation tables and PID state, while 32 KB Flash stores motion profiles. Operating from 2.7 V to 5.5 V, the device works with both 3.3 V and 5 V gate-driver logic. The exposed-pad 44-VQFN package improves thermal coupling to the PCB ground plane, which matters when the MCU shares an enclosure with power stages.
Recommandé
Consumer Appliance Controllers
The ATMEGA32L-8MJ is a natural fit for consumer appliance controllers such as washing machines, dishwashers, and coffee makers, where 32 KB Flash holds user-interface state machines and 32 I/O lines drive buttons, seven-segment displays, and triac gates. The 8-channel 10-bit ADC reads thermistors and water-level sensors, and the watchdog timer ensures safe recovery from brownouts on noisy mains-derived rails. The 2.7-5.5 V range tolerates the wide tolerance of low-cost linear supplies. Two USARTs support optional Wi-Fi or display modules, and the JTAG interface allows factory firmware loading and boundary-scan test. The 44-VQFN (7x7 mm) package with exposed pad reduces board size and improves thermal performance in sealed enclosures where airflow is limited.
Recommandé
Legacy AVR Design Migration
The ATMEGA32L-8MJ is frequently chosen when migrating legacy ATmega32 designs from the 44-pin TQFP to a smaller QFN footprint. Because the die, memory map, peripheral set, and instruction set are identical to the ATMEGA32L-8AI, firmware compiled for the ATmega32 core runs unchanged; only the PCB land pattern and pin numbering change. The 44-VQFN (7x7 mm) package saves roughly 60 percent of the footprint area versus TQFP-44, enabling denser boards. The exposed pad provides a direct thermal path to the ground plane, improving heat dissipation in sealed enclosures. In-system programming via SPI or JTAG preserves the existing production programming flow, and the 2.7-5.5 V range maintains compatibility with legacy 5 V and modern 3.3 V rails.
Recommandé
Sensor Data Loggers
The ATMEGA32L-8MJ works well in sensor data loggers because its 1 KB EEPROM stores calibration and configuration data, 2 KB SRAM buffers sample bursts, and 32 KB Flash holds acquisition firmware plus a ring buffer for offline records. The 8-channel 10-bit ADC digitizes analog sensors, while SPI and I2C connect digital sensors and serial Flash or SD-card interfaces. Two USARTs allow simultaneous GPS and telemetry links. Operating from 2.7 V to 5.5 V, the device runs directly from lithium primary cells or 3.3 V rails, and its sleep modes extend field life to months. The 44-VQFN (7x7 mm) package with exposed pad keeps the logger compact and thermally stable in outdoor enclosures, and JTAG debug speeds firmware development.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA32L-8MJ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA32L-8MU | ATMEGA32-8MJ | ATMEGA32L-8MI | ATMEGA32L-8AI |
|---|---|---|---|---|---|
| Package | 44-VQFN (7x7) exposed pad | 44-QFN/MLF | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-TQFP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB (16K x 16) | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| ADC Channels | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| I/O Lines | 32 | 32 | 32 | 32 | 32 |
Principaux différenciateurs
- Low-voltage operation down to 2.7 V (vs ATMEGA32-8MJ)
- Smaller 44-VQFN (7x7 mm) footprint (vs ATMEGA32L-8AI)
- Full ATmega32 peripheral set in a low-voltage part (vs ATMEGA32L-8MU)
Notes de conception
The 44-VQFN exposed pad must be soldered to a grounded thermal land with a minimum of nine thermal vias (0.3 mm drill) connecting to the internal ground plane. Microchip's ATmega32 datasheet recommends a solder-paste stencil aperture of 50-80 percent pad coverage to prevent voiding. Estimated: with a 0.5 W dissipation and a 4-layer board, the exposed pad plus vias keeps the junction rise below 20C above ambient, well inside the 85C limit.
Decouple every VCC pin (pins 10 and 41) with a 100 nF ceramic capacitor placed within 2 mm of the pin, and add a 10 uF bulk capacitor near the package. The AVCC pin (pin 30) requires its own 100 nF capacitor plus a 10 uH inductor or ferrite bead from VCC to isolate ADC noise. AREF (pin 32) should be bypassed with 100 nF to ground; if the internal reference is used, connect AREF to VCC through a 10 kOhm resistor.
Do not exceed the 8 MHz maximum clock when VCC is below 4.5 V; the ATmega32L is rated for 8 MHz across 2.7-5.5 V, but running a 16 MHz crystal at 3.3 V will cause erratic operation. Also ensure the RESET pin (pin 9) has a 10 kOhm pull-up to VCC and a 100 nF capacitor to ground for reliable power-on reset. Unused I/O pins should be configured as inputs with internal pull-ups or driven low to avoid floating-input current draw.
Informations de conformité
Distributor and manufacturer data list the ATMEGA32L-8MJ as RoHS compliant and lead-free. The standard ATmega32L is not AEC-Q100 qualified; automotive programs should request Microchip's automotive-grade equivalents.
