ATMEGA128L-8AC - 8-bit AVR MCU, 128KB Flash, 8MHz, 64-TQFP | Microchip
Référence : ATMEGA128L-8AC ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.4 | $164,00 |
| 100 | $13.95 | $1 395,00 |
| 500 | $12.1 | $6 050,00 |
| 1 000 | $10.85 | $10 850,00 |
ATMEGA128L-8AC Présentation
An 8-bit microcontroller (MCU) is a programmable logic device that integrates a CPU, memory (Flash, SRAM, EEPROM), and peripherals (ADC, timers, communication interfaces) on a single silicon die. Within the broader taxonomy, the ATMEGA128L belongs to the AVR RISC microcontroller family, which in turn is part of the embedded microcontroller category, sitting under microcontrollers and integrated circuits in the electronic component hierarchy. ATmega devices specifically use a modified Harvard architecture with separate program and data buses plus a dedicated EEPROM bus, an arrangement that lets the CPU fetch instructions while reading or writing EEPROM in the same cycle - ideal for data-logging applications.
Key features of the ATMEGA128L-8AC include 53 general-purpose I/O lines, 32 general-purpose working registers, an 8-channel 10-bit ADC, two USARTs, a byte-oriented Two-Wire Serial Interface (TWI, I2C-compatible), an SPI serial interface, four flexible Timer/Counters with compare modes and PWM, a real-time counter with separate oscillator, a JTAG interface for on-chip debug, six sleep modes for power optimization, and a watchdog timer with on-chip oscillator. The 64-pin TQFP (14x14) surface-mount package provides 53 usable I/O pins with the remainder allocated to power, ground, reset, crystal, and JTAG signals.
The die uses an enhanced RISC architecture with 133 powerful instructions, most executed in a single clock cycle, enabling deterministic interrupt latency and code-density advantages over CISC alternatives. The internal bandgap reference, brown-out detector, and on-chip debug logic reduce external component count. The 'L' suffix designates the low-voltage variant (2.7V-5.5V), distinguished from the standard ATMEGA128 (4.5V-5.5V); the 'C' suffix indicates the commercial 0C to +70C temperature range, and the 'AC' suffix the TQFP package.
Typical applications include industrial control systems, building automation, HVAC controllers, low-power sensor nodes, data loggers, and battery-powered instrumentation where the 2.7V-5.5V supply range and six programmable sleep modes (down to sub-microamp standby currents typical of L-grade devices) provide extended battery life. The 128KB of Flash and 4KB EEPROM enable substantial on-board firmware storage with non-volatile parameter retention across power cycles.
When designing with this part, plan ISP (In-System Programming) header accessibility from the start: the MOSI, MISO, SCK, and RESET pins must reach an external header for field updates. The L-grade 2.7V minimum also means brown-out detection (BOD) thresholds must be configured correctly - the default BOD level is below the safe minimum for 8 MHz operation and should be raised via fuses for production firmware.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes that go beyond the Atmel/Microchip datasheet coverage.
Alternatives de remplacement direct pour ATMEGA128L-8AC — 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 ATMEGA128L-8AC (même facteur de forme et même empreinte) — différant par Package, Operating Temperature, RoHS Status, Supply Voltage Range, ADC.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA128L-8AU
✅ Remplacement direct✓ En stock
$23.49 / unité
Voir la fiche technique →ATMEGA128L-8AI
✅ Remplacement direct✓ En stock
$6.6 / unité
Voir la fiche technique →ATMEGA128L-8MC
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
Contactez-nous pour le prix
Voir la fiche technique →ATMEGA128A-MU
✅ Remplacement direct✓ En stock
$5.2 / unité
Voir la fiche technique →ATMEGA1284-AU
✅ Remplacement direct✓ En stock
$7.8934 / unité
Voir la fiche technique →ATMEGA128L-8AC Valeurs maximales et caractéristiques électriques
| Core Architecture | AVR RISC (enhanced 8-bit) |
| Program Memory (Flash) | 128 KB (64K x 16) |
| SRAM | 4 KB |
| EEPROM | 4 KB |
| Fréquence d'horloge maximale | 8 MHz |
| Operating Voltage (L-grade) | 2.7 V to 5.5 V |
| MIPS Throughput | Up to 8 MIPS at 8 MHz |
| Instruction Set | 133 instructions, mostly single-cycle |
| General-Purpose I/O Pins | 53 |
| General-Purpose Registers | 32 |
| ADC | 10-bit, 8-channel |
| USART | 2 |
| Two-Wire Interface (I2C) | 1 (byte-oriented) |
| SPI | 1 |
| Timer/Counters | 4 (with compare and PWM) |
| Watchdog Timer | Yes (with on-chip oscillator) |
| Boîtier | 64-pin TQFP (14x14 mm) |
| Température de fonctionnement | 0 C to +70 C (commercial, 'C' suffix) |
| Type de montage | Surface Mount |
| JTAG Debug Interface | Yes (IEEE 1149.1 compliant) |
| Statut RoHS | Compliant (lead-free 'AC' suffix) |
Configuration des broches de ATMEGA128L-8AC
| Broche 1 | AVCC — Analog supply voltage for ADC |
| Broche 2 | PE0 (RXD0/PDI) — Port E bit 0, USART0 RXD, PDI |
| Broche 3 | PE1 (TXD0/PDO) — Port E bit 1, USART0 TXD, PDO |
| Broche 4 | PE2 (XCK0/AIN0) — Port E bit 2, USART0 clock, analog input |
| Broche 5 | PE3 (OC3A/AIN1) — Port E bit 3, Timer3 output compare A, analog input |
| Broche 6 | PE4 (OC3B/INT4) — Port E bit 4, Timer3 output compare B, interrupt 4 |
| Broche 7 | PE5 (OC3C/INT5) — Port E bit 5, Timer3 output compare C, interrupt 5 |
| Broche 8 | PE6 (T3/INT6) — Port E bit 6, Timer3 input, interrupt 6 |
| Broche 9 | PE7 (ICP3/INT7) — Port E bit 7, Timer3 input capture, interrupt 7 |
| Broche 10 | VCC — Digital supply voltage |
| Broche 11 | GND — Digital ground |
| Broche 12 | XTAL2 — Crystal oscillator output |
| Broche 13 | XTAL1 — Crystal oscillator input |
| Broche 14 | RESET — Reset input (active low) |
| Broche 15 | VCC — Digital supply voltage |
| Broche 16 | GND — Digital ground |
| Broche 17 | PA0 (AD0) — Port A bit 0, ADC input channel 0 |
| Broche 18 | PA1 (AD1) — Port A bit 1, ADC input channel 1 |
| Broche 19 | PA2 (AD2) — Port A bit 2, ADC input channel 2 |
| Broche 20 | PA3 (AD3) — Port A bit 3, ADC input channel 3 |
| Broche 21 | PA4 (AD4) — Port A bit 4, ADC input channel 4 |
| Broche 22 | PA5 (AD5) — Port A bit 5, ADC input channel 5 |
| Broche 23 | PA6 (AD6) — Port A bit 6, ADC input channel 6 |
| Broche 24 | PA7 (AD7) — Port A bit 7, ADC input channel 7 |
| Broche 25 | AREF — ADC reference voltage |
| Broche 26 | AVCC — Analog supply voltage for ADC |
| Broche 27 | GND — Analog ground |
| Broche 28 | PB0 (SS/) — Port B bit 0, SPI slave select |
| Broche 29 | PB1 (SCK) — Port B bit 1, SPI clock |
| Broche 30 | PB2 (MOSI) — Port B bit 2, SPI master out |
| Broche 31 | PB3 (MISO) — Port B bit 3, SPI master in |
| Broche 32 | PB4 (OC0) — Port B bit 4, Timer0 compare output |
| Broche 33 | PB5 (OC1A) — Port B bit 5, Timer1 compare A output |
| Broche 34 | PB6 (OC1B) — Port B bit 6, Timer1 compare B output |
| Broche 35 | PB7 (OC2/OC1C) — Port B bit 7, Timer2/1 compare C output |
| Broche 36 | PC0 (SCL) — Port C bit 0, TWI clock |
| Broche 37 | PC1 (SDA) — Port C bit 1, TWI data |
| Broche 38 | PC2 (TCK) — Port C bit 2, JTAG TCK |
| Broche 39 | PC3 (TMS) — Port C bit 3, JTAG TMS |
| Broche 40 | PC4 (TDO) — Port C bit 4, JTAG TDO |
| Broche 41 | PC5 (TDI) — Port C bit 5, JTAG TDI |
| Broche 42 | PC6 (TOSC1) — Port C bit 6, Timer0 oscillator pin 1 |
| Broche 43 | PC7 (TOSC2) — Port C bit 7, Timer0 oscillator pin 2 |
| Broche 44 | PD0 (RXD1/INT0) — Port D bit 0, USART1 RXD, interrupt 0 |
| Broche 45 | PD1 (TXD1/INT1) — Port D bit 1, USART1 TXD, interrupt 1 |
| Broche 46 | PD2 (INT2) — Port D bit 2, interrupt 2 |
| Broche 47 | PD3 (INT3) — Port D bit 3, interrupt 3 |
| Broche 48 | PD4 (ICP1) — Port D bit 4, Timer1 input capture |
| Broche 49 | PD5 (XCK1) — Port D bit 5, USART1 clock |
| Broche 50 | PD6 (T1) — Port D bit 6, Timer1 external clock |
| Broche 51 | PD7 (T2) — Port D bit 7, Timer2 external clock |
| Broche 52 | PF0 (ADC0/T0) — Port F bit 0, ADC input 0, Timer0 |
| Broche 53 | PF1 (ADC1/T1) — Port F bit 1, ADC input 1, Timer1 |
| Broche 54 | PF2 (ADC2) — Port F bit 2, ADC input 2 |
| Broche 55 | PF3 (ADC3) — Port F bit 3, ADC input 3 |
| Broche 56 | PF4 (ADC4/TCK) — Port F bit 4, ADC input 4, JTAG TCK |
| Broche 57 | PF5 (ADC5/TMS) — Port F bit 5, ADC input 5, JTAG TMS |
| Broche 58 | PF6 (ADC6/TDO) — Port F bit 6, ADC input 6, JTAG TDO |
| Broche 59 | PF7 (ADC7/TDI) — Port F bit 7, ADC input 7, JTAG TDI |
| Broche 60 | GND — Digital ground |
| Broche 61 | VCC — Digital supply voltage |
| Broche 62 | PG0 (WR/) — Port G bit 0, external write strobe |
| Broche 63 | PG1 (RD/) — Port G bit 1, external read strobe |
| Broche 64 | PG2 (ALE) — Port G bit 2, address latch enable |
Applications typiques
ATMEGA128L-8AC convient pour 6 applications: Industrial Control and Automation, Building Automation and HVAC Controllers, Low-Power Sensor Data Loggers, Human-Machine Interface Panels, Point-of-Sale Terminals and Peripherals, Educational and Development Boards.
Industrial Control and Automation
The ATMEGA128L-8AC fits industrial control applications because its 128KB Flash, 4KB SRAM, and 53 GPIO lines support multi-protocol control loops, while the L-grade 2.7V to 5.5V supply tolerance handles 24V industrial bus rails stepped down via simple regulators. The dual USART enables RS-232/RS-485 master/slave bridging simultaneously, the Two-Wire Interface drives I2C sensor clusters, and the 8-channel 10-bit ADC reads 4-20 mA process signals directly through shunt resistors. The 8 MHz clock at full MIPS keeps deterministic loop times for PID control. The commercial 0C-70C temperature rating suits factory-floor environments; for outdoor or refrigerated cabinets, drop in the ATMEGA128L-8AI or 8AU industrial-grade alternative without PCB rework.
Recommandé
Building Automation and HVAC Controllers
The ATMEGA128L-8AC is well matched to building automation controllers where the 128KB Flash stores full BACnet or Modbus protocol stacks alongside the HVAC control application code, while 4KB EEPROM retains setpoints and schedules across power loss. Its 53 I/O pins drive multiple relay banks, triac outputs for AC loads, and 0-10V analog outputs without external I/O expanders, reducing PCB area. The dual USART supports both a touch-panel HMI and the building trunk simultaneously. Six programmable sleep modes let battery-backed thermostats achieve multi-year battery life. The 8 MHz clock and 2.7V-5.5V L-grade supply accommodate direct 3.3V or 5V regulation from a small switching converter or a linear regulator.
Recommandé
Low-Power Sensor Data Loggers
The ATMEGA128L-8AC is ideal for battery-powered sensor data loggers because its six programmable sleep modes (Power-down, Power-save, Standby) lower quiescent current to microamp levels when the main oscillator is gated and an asynchronous timer on a 32 kHz crystal handles wake-up scheduling. The 4KB EEPROM stores calibration tables and recent log entries across months of battery operation, while the 128KB Flash holds the data logging firmware with compression and statistics routines. The 8-channel 10-bit ADC samples thermocouples, pressure, and humidity sensors directly. The L-grade 2.7V minimum allows two AA alkaline cells or a 3.6V Li-SOCl2 primary cell to power the logger, simplifying field deployment and eliminating solar or wall power.
Recommandé
Human-Machine Interface Panels
The ATMEGA128L-8AC suits HMI display panels because its 128KB Flash stores full color graphics libraries plus locale strings and menu trees, while 4KB SRAM buffers partial screen refreshes during fast UI updates. The SPI port drives TFT displays directly at 8 MHz, the Two-Wire Interface hosts I2C touch controllers, and the dual USART bridges to a backhaul Modbus or CAN node. The 53 GPIO pins directly drive key matrices, LED status indicators, and buzzer drivers. Its JTAG interface accelerates development on iterative HMI firmware revisions. The L-grade supply range supports 3.3V TFT logic without additional level translation, while the commercial 0-70C range is adequate for indoor enclosures.
Recommandé
Point-of-Sale Terminals and Peripherals
The ATMEGA128L-8AC supports POS peripheral controllers because its 128KB Flash accommodates EMV, ISO 7816, and NFC stack libraries alongside payment application code, while the dual USART handles simultaneous magnetic-stripe readers and encrypted PIN-pad interfaces. The 53 GPIO pins drive key matrices, multi-color status LEDs, and thermal printer stepper-motor phases without auxiliary logic. The 8-channel 10-bit ADC reads battery voltage and tamper switches. Six sleep modes keep handheld payment terminals alive for entire shifts between charges. The L-grade voltage range accommodates single-cell Li-ion or Li-Polymer supply rails directly, simplifying power tree design in compact form factors.
Recommandé
Educational and Development Boards
The ATMEGA128L-8AC is well suited to educational boards and engineering development kits because its 128KB Flash, comprehensive peripheral set (USART/SPI/TWI/JTAG), and JTAG debug interface provide a complete learning platform for 8-bit embedded design. The dual USART supports debug-print bridges and external peripheral simulation simultaneously, while 53 GPIO pins let students explore interrupt-driven I/O, timer PWM, and ADC sampling without resource conflicts. The L-grade voltage tolerance allows USB bus-powered operation through a 3.3V LDO. The same TQFP-64 footprint shared with ATMEGA128A-MU and ATMEGA1284-AU lets a single PCB target multiple tiers, supporting progressive firmware development from 8 MHz to 16 MHz across the family.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA128L-8AC — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA128L-8AU | ATMEGA128L-8AI | ATMEGA128L-8MC | ATMEGA128A-MU | ATMEGA1284-AU |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (14x14) | TQFP-64 (14x14) - same | TQFP-64 (14x14) - same | TQFP-64 (14x14) - same | QFN-64 (MLF) - footprint-migrated | TQFP-64 (14x14) - same |
| Brand | Microchip Technology (formerly Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| Maximum Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 16 MHz | 20 MHz |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 16 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Operating Voltage | 2.7V to 5.5V (L-grade) | 2.7V to 5.5V (L-grade) | 2.7V to 5.5V (L-grade) | 2.7V to 5.5V (L-grade) | 2.7V to 5.5V | 2.7V to 5.5V (low-voltage variant) |
| Temperature Range | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C | -40C to +85C (industrial) | -40C to +85C (industrial) |
| GPIO Pins | 53 | 53 | 53 | 53 | 53 | 36 |
Principaux différenciateurs
- Low-voltage 2.7V minimum supply enables direct battery operation (vs ATMEGA128A-MU)
- Commercial-grade TQFP-64 is the lowest-cost surface-mount option in the ATmega128 family (vs ATMEGA128L-8AU)
- Same AVR instruction set and toolchain across the family (vs ATMEGA1284-AU)
Notes de conception
Estimated: At 3.3V VCC, 8 MHz active, the ATMEGA128L-8AC draws roughly 6-10 mA active and sub-1 uA in Power-down mode (typical Microchip AVR L-grade curves). Connect both AVCC pins to a 100 nF + 10 uF bypass capacitor pair and place decoupling as close to each VCC pin as possible; AVCC must never exceed VCC + 0.3V or ADC readings will be corrupted. For battery applications, gate analog power through a MOSFET driven by a dedicated GPIO to achieve <1 uA analog-block standby when the ADC is disabled. Confirm the active current with the Microchip ATmega128 datasheet electrical characteristics table (typical values, not minimum).
Route the JTAG signals (TCK/TMS/TDO/TDI on PORTC and PORTF) with short traces and a ground reference for noise immunity; JTAG clock errors are the most common cause of debug failures. Place the ISP header with MOSI/MISO/SCK/RESET accessible without crossing analog signals. The TQFP-64 thermal pad (center pad) should be soldered to a copper pour with thermal vias to ground for improved thermal dissipation, although L-grade parts rarely need more than natural PCB cooling.
Brown-out detection (BOD) defaults to a low threshold that is below the minimum for 8 MHz operation. Set BODLEVEL fuses to 2.7V minimum for L-grade parts, otherwise the chip may execute erratically when battery voltage sags below the safe operating region. The internal 32 kHz oscillator TOSC1/TOSC2 pins must be disabled if a 32 kHz crystal is not installed, otherwise the chip may fail to start in Power-save mode. The 'AC' suffix denotes a commercial-grade TQFP package, not a 'C' variant for some other manufacturer - do not confuse with industrial 'AI' or 'AU' suffixes; the silicon die is identical across the family.
Keep the 8 MHz crystal trace lengths under 10 mm and surround with a quiet ground guard ring; the high-impedance XTAL pins are highly susceptible to noise. Place the ISP and JTAG connectors on the edge of the PCB for production programming access without removing shields. Route PORTA and PORTF (ADC inputs) as short analog nets surrounded by analog ground; mix digital and analog ground only at a single point near the AVCC pin decoupling capacitor. This prevents digital switching noise from coupling into ADC samples when reading small signals.
Informations de conformité
RoHS compliant per Microchip product page; the 'C'/'A' suffix indicates lead-free TQFP package. AEC-Q100 not applicable - this is a commercial-grade MCU. Industrial variants (-40C to +85C) are available as ATMEGA128L-8AI/-8AU without PCB changes.
