ATMEGA128L-8ANR - 8MHz 128KB Flash AVR MCU | Microchip 64-TQFP
MPN: ATMEGA128L-8ANR ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.85 | $168.50 |
| 100 | $14.95 | $1,495.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $11.85 | $11,850.00 |
ATMEGA128L-8ANR Overview
An AVR microcontroller is an 8-bit RISC (Reduced Instruction Set Computer) processor based on a Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur in the same clock cycle. The ATmega128L belongs to the megaAVR family, which sits in the broader taxonomy of microcontroller -> embedded controller -> semiconductor IC. It is designed for embedded applications requiring deterministic real-time response, low power consumption, and integrated analog/digital peripherals.
Key features include 53 general-purpose I/O lines, 32 general-purpose working registers, four flexible Timer/Counters with compare modes and PWM, two USARTs, a byte-oriented Two-wire Serial Interface (TWI/I2C-compatible), an SPI serial interface, an 8-channel 10-bit successive-approximation ADC, a JTAG interface for on-chip debugging, and a watchdog timer with separate on-chip oscillator. The device supports supply voltages from 2.7 V to 5.5 V (the 'L' variant optimizes low-voltage operation versus the standard ATmega128).
The architecture uses an advanced RISC core with 133 powerful instructions, most executed in a single clock cycle. The integrated JTAG (IEEE 1149.1-compliant) interface supports boundary-scan and on-chip debug, simplifying in-system programming and field updates. The peripheral feature set is balanced for industrial control, human-interface designs, and battery-powered instrumentation.
Typical applications include industrial automation and control, low-power IoT edge nodes, embedded HMI panels, sensor data acquisition systems, motor control firmware platforms, and battery-powered portable instrumentation. The wide 2.7 V to 5.5 V supply range also makes it suitable for legacy 5 V systems as well as 3.3 V designs with adequate decoupling.
When designing with this part, ensure the JTAG pins are correctly terminated if the interface is unused, and respect the maximum clock frequency versus supply voltage tradeoff: at 2.7 V the device is rated up to 8 MHz, while higher frequencies require an external clock or crystal with proper load capacitor selection. Programming via SPI is also supported for bootloader-based field upgrades.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design considerations not found on a single datasheet page.
Drop-in alternatives for ATMEGA128L-8ANR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA128L-8ANR (same form factor and footprint) — differing in Package, Communication Interfaces, Operating Temperature, Timers/Counters, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA128L-8AU
✅ Drop-In✓ In Stock
$23.49 / Unit
View Datasheet →ATMEGA128L-8AN
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA128L-8MN
✅ Drop-In✓ In Stock
$7.68 / Unit
View Datasheet →ATMEGA128L-8MNR
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →ATMEGA128-16AN
✅ Drop-In✓ In Stock
$7.44 / Unit
View Datasheet →ATMEGA128-16AI
✅ Drop-In✓ In Stock
$5.9 / Unit
View Datasheet →ATMEGA128L-8ANR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 128 KB (64K x 16) |
| SRAM | 4 KB |
| EEPROM | 4 KB |
| Maximum Clock Frequency | 8 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V |
| GPIO Pins | 53 |
| ADC | 8-channel, 10-bit |
| Timers/Counters | 4 flexible Timer/Counters with PWM |
| Communication Interfaces | 2x USART, SPI, TWI (I2C-compatible) |
| JTAG Interface | Yes (IEEE 1149.1-compliant, on-chip debug) |
| Package | 64-pin TQFP (14x14 mm), 1 mm height, Tape & Reel |
| Mounting Type | Surface Mount |
| Operating Temperature | Industrial, -40C to +85C (R suffix indicates T&R packaging) |
| Watchdog Timer | Yes, with separate on-chip oscillator |
| Instruction Set | 133 powerful instructions, mostly single-cycle |
| Throughput | Up to 1 MIPS per MHz |
| RoHS Status | Compliant (Green, Pb-free) |
ATMEGA128L-8ANR Pin Configuration
| Pin 1 | VCC — Digital supply voltage (2.7 V to 5.5 V) |
| Pin 2 | PE0 (RXD0/PDI) — Port E bit 0 / USART0 RXD / Programming Data In |
| Pin 3 | PE1 (TXD0/PDO) — Port E bit 1 / USART0 TXD / Programming Data Out |
| Pin 4 | PE2 (AIN0/XCK0) — Port E bit 2 / Analog comparator input 0 / USART0 clock |
| Pin 5 | PE3 (AIN1/OC3A) — Port E bit 3 / Analog comparator input 1 / Timer3 Compare A |
| Pin 6 | PE4 (OC3B/INT4) — Port E bit 4 / Timer3 Compare B / External interrupt 4 |
| Pin 7 | PE5 (OC3C/INT5) — Port E bit 5 / Timer3 Compare C / External interrupt 5 |
| Pin 8 | PE6 (T3/INT6) — Port E bit 6 / Timer3 clock input / External interrupt 6 |
| Pin 9 | PE7 (ICP3/INT7) — Port E bit 7 / Timer3 input capture / External interrupt 7 |
| Pin 10 | VCC — Digital supply voltage |
| Pin 11 | GND — Ground |
| Pin 12 | PA0 (AD0) — Port A bit 0 / External memory address/data bit 0 |
| Pin 13 | PA1 (AD1) — Port A bit 1 / External memory address/data bit 1 |
| Pin 14 | PA2 (AD2) — Port A bit 2 / External memory address/data bit 2 |
| Pin 15 | PA3 (AD3) — Port A bit 3 / External memory address/data bit 3 |
| Pin 16 | PA4 (AD4) — Port A bit 4 / External memory address/data bit 4 |
| Pin 17 | PA5 (AD5) — Port A bit 5 / External memory address/data bit 5 |
| Pin 18 | PA6 (AD6) — Port A bit 6 / External memory address/data bit 6 |
| Pin 19 | PA7 (AD7) — Port A bit 7 / External memory address/data bit 7 |
| Pin 20 | RESET — Reset input, active low |
| Pin 21 | VCC — Digital supply voltage |
| Pin 22 | GND — Ground |
| Pin 23 | XTAL2 — Crystal oscillator output |
| Pin 24 | XTAL1 — Crystal oscillator input / external clock input |
| Pin 25 | PD0 (SCL/INT0) — Port D bit 0 / TWI clock / External interrupt 0 |
| Pin 26 | PD1 (SDA/INT1) — Port D bit 1 / TWI data / External interrupt 1 |
| Pin 27 | PD2 (RXD1/INT2) — Port D bit 2 / USART1 RXD / External interrupt 2 |
| Pin 28 | PD3 (TXD1/INT3) — Port D bit 3 / USART1 TXD / External interrupt 3 |
| Pin 29 | PD4 (ICP1) — Port D bit 4 / Timer1 input capture |
| Pin 30 | VCC — Digital supply voltage |
| Pin 31 | GND — Ground |
| Pin 32 | GND — Ground |
| Pin 33 | PC0 (A8) — Port C bit 0 / External memory address bit 8 |
| Pin 34 | PC1 (A9) — Port C bit 1 / External memory address bit 9 |
| Pin 35 | PC2 (A10) — Port C bit 2 / External memory address bit 10 |
| Pin 36 | PC3 (A11) — Port C bit 3 / External memory address bit 11 |
| Pin 37 | PC4 (A12) — Port C bit 4 / External memory address bit 12 |
| Pin 38 | PC5 (A13) — Port C bit 5 / External memory address bit 13 |
| Pin 39 | PC6 (A14) — Port C bit 6 / External memory address bit 14 |
| Pin 40 | PC7 (A15) — Port C bit 7 / External memory address bit 15 |
| Pin 41 | PG0 (WR) — Port G bit 0 / External memory write strobe |
| Pin 42 | PG1 (RD) — Port G bit 1 / External memory read strobe |
| Pin 43 | PG2 (ALE) — Port G bit 2 / Address latch enable |
| Pin 44 | PB0 (SS) — Port B bit 0 / SPI slave select |
| Pin 45 | PB1 (SCK) — Port B bit 1 / SPI serial clock |
| Pin 46 | PB2 (MOSI) — Port B bit 2 / SPI master out slave in |
| Pin 47 | PB3 (MISO) — Port B bit 3 / SPI master in slave out |
| Pin 48 | PB4 (OC0) — Port B bit 4 / Timer0 compare output |
| Pin 49 | PB5 (OC1A) — Port B bit 5 / Timer1 compare A output |
| Pin 50 | PB6 (OC1B) — Port B bit 6 / Timer1 compare B output |
| Pin 51 | PB7 (OC2/OC1C) — Port B bit 7 / Timer2 compare or Timer1 compare C |
| Pin 52 | PF0 (ADC0) — Port F bit 0 / ADC channel 0 |
| Pin 53 | PF1 (ADC1) — Port F bit 1 / ADC channel 1 |
| Pin 54 | PF2 (ADC2) — Port F bit 2 / ADC channel 2 |
| Pin 55 | PF3 (ADC3) — Port F bit 3 / ADC channel 3 |
| Pin 56 | PF4 (ADC4/TCK) — Port F bit 4 / ADC channel 4 / JTAG TCK |
| Pin 57 | PF5 (ADC5/TMS) — Port F bit 5 / ADC channel 5 / JTAG TMS |
| Pin 58 | PF6 (ADC6/TDO) — Port F bit 6 / ADC channel 6 / JTAG TDO |
| Pin 59 | PF7 (ADC7/TDI) — Port F bit 7 / ADC channel 7 / JTAG TDI |
| Pin 60 | AREF — ADC reference voltage |
| Pin 61 | VCC — Digital supply voltage |
| Pin 62 | GND — Ground |
| Pin 63 | AVCC — Analog supply voltage for ADC |
| Pin 64 | GND — Ground |
Typical Applications
ATMEGA128L-8ANR is suitable for 6 applications: Industrial Automation and Process Control, Battery-Powered IoT Edge Nodes, Embedded Human-Machine Interface (HMI), Sensor Data Acquisition Systems, Motor Control and PWM Drivers, Legacy 5V Embedded Systems Upgrade.
Industrial Automation and Process Control
The ATMEGA128L-8ANR's 53 GPIO lines, four Timer/Counters with PWM, and dual USARTs make it a strong fit for industrial PLC and process-control modules where deterministic real-time response is required. The 8-channel 10-bit ADC handles analog sensor inputs (temperature, pressure, flow) directly, while the 128 KB Flash and 4 KB EEPROM provide ample headroom for Modbus RTU, CAN, or proprietary fieldbus protocol stacks. Wide 2.7 V to 5.5 V supply tolerance simplifies integration with both 24 V-derived 5 V rails and 3.3 V logic systems common in factory-automation backplanes.
Recommended
Battery-Powered IoT Edge Nodes
The ATMEGA128L-8ANR's low-voltage 'L' silicon, six software-selectable sleep modes, and microampere-range power-down current suit battery-powered wireless sensor nodes. The 4 KB EEPROM enables non-volatile configuration storage without external memory ICs, and the integrated TWI (I2C) and SPI interfaces connect directly to sensors and sub-GHz radio modules such as the Microchip MRF89XA. JTAG-based on-chip debug accelerates firmware iteration during IoT product development, while the 64-pin TQFP package supports compact PCB layouts.
Recommended
Embedded Human-Machine Interface (HMI)
With 128 KB Flash, 4 KB SRAM, and an integrated ADC, the ATMEGA128L-8ANR drives mid-complexity HMI panels including character LCDs, keypad matrices, and LED status indicators. The dual USARTs split communication between a host controller and an RS-485 fieldbus, while the four PWM channels drive backlight dimming, buzzer tones, and indicator brightness. Industrial temperature rating (-40 C to +85 C) and JTAG-based field firmware updates via bootloader make it suitable for ruggedized operator-interface panels.
Recommended
Sensor Data Acquisition Systems
The ATMEGA128L-8ANR integrates an 8-channel 10-bit ADC, JTAG interface, and 53 GPIOs - ideal for multi-channel sensor data loggers in laboratory and field instrumentation. The 4 KB EEPROM provides non-volatile storage for calibration coefficients, while the 128 KB Flash hosts DSP-style filtering routines running at 1 MIPS per MHz. Combined with the SPI bus for high-speed external ADC or FRAM expansion, the device captures slow analog processes such as strain gauge bridges, thermocouples, and 4-20 mA loops with deterministic timing.
Recommended
Motor Control and PWM Drivers
The four flexible Timer/Counters with PWM modes make the ATMEGA128L-8ANR a cost-effective platform for brushed DC and stepper motor control in small appliances, robotics, and CNC accessory axes. The 8 MHz clock drives up to four PWM channels with selectable phase-correct or fast-PWM modes, while the dual USARTs handle command input from a host controller. The 64-pin TQFP package dissipates modest heat at moderate PWM duty cycles, and the 5.5 V absolute maximum tolerates 5 V gate-driver rails for small H-bridges.
Recommended
Legacy 5V Embedded Systems Upgrade
The ATMEGA128L-8ANR's 5.5 V absolute maximum and JTAG-based field upgrade path make it a natural choice for extending the lifecycle of legacy 5 V embedded controllers that must add connectivity or richer peripherals. With 128 KB Flash, designers can integrate Bluetooth/Wi-Fi co-processor command stacks, USB-to-UART bridges, or new sensor drivers without external memory. The ATmega128 is 100% pin-compatible with the older ATmega103, simplifying migration of legacy PCBs into modernized firmware architectures.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA128L-8ANR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA128L-8AU | ATMEGA128L-8AN | ATMEGA128L-8MN | ATMEGA128-16AN | ATMEGA128-16AI |
|---|---|---|---|---|---|---|
| Package | 64-pin TQFP (14x14 mm) | 64-pin TQFP (14x14 mm) - same | 64-pin TQFP (14x14 mm) - same | 64-pin TQFP (14x14 mm) - same | 64-pin TQFP (14x14 mm) - same | 64-pin TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 16 MHz | 16 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Packaging Format | Tape & Reel | Tray | Tray | Tray | Tray | Tray |
| Lifecycle Status | NRND (estimated EOL 2024) | NRND | NRND | Active | NRND | NRND |
Key Differentiators
- Pin-and-silicon identical tray counterpart (vs ATMEGA128L-8AU)
- Same-package higher-speed upgrade path (vs ATMEGA128-16AN)
- Wide 2.7 V to 5.5 V supply tolerance vs 5V-only parts (vs ATMEGA128-16AN)
Design Notes
Decouple the ATMEGA128L-8ANR supply rails with a 100 nF ceramic capacitor placed within 5 mm of each VCC pin (pins 10, 21, 30, 61) plus a 10 uF bulk capacitor on the AVCC pin (63). The 'L' variant operates down to 2.7 V but the maximum clock at that voltage is 8 MHz; operating above the rated frequency versus VCC curve will result in unstable Flash reads. Estimated: a 3.3 V system running at 8 MHz with 53 GPIOs switching at 1 MHz can source up to 200 mA peak supply transients.
Route the JTAG signals (TMS, TCK, TDI, TDO on PF4-PF7) away from switching signal traces to avoid debug interference, and place 4.7 kohm pull-up resistors on the TCK and TMS lines if the JTAG connector is removable. Keep the XTAL1/XTAL2 traces short and symmetric; crystal load capacitors (typically 12-22 pF) must match the crystal's rated load capacitance (CL) computed as CL = (C1 * C2) / (C1 + C2) + Cstray where Cstray is approximately 5 pF.
Do not program the JTAGEN fuse (OCDEN/JTAGEN bits) without first ensuring your programmer supports JTAG; disabling JTAG without an alternative ISP path will brick the device unless a high-voltage parallel programmer is available. The AREF pin must not exceed AVCC by more than 0.3 V or fall below 1.0 V without proper bypassing to avoid damage to the ADC. Finally, the external memory interface pins (PORTA, PORTC, PG0-PG2) must be disabled via the XMCR register when unused, or they will consume additional power and conflict with general-purpose I/O.
The TQFP-64 package has a typical theta_JA of approximately 50 C/W when mounted on a 4-layer JEDEC test board, which is adequate for typical MCU workloads (less than 100 mW). Estimated: in a sealed enclosure without airflow, derate maximum ambient by approximately 5 C per watt of dissipation above 0.5 W to keep the junction below 125 C. For industrial applications pushing high GPIO current loads, use ground-plane-connected thermal vias under the exposed die pad and minimize adjacent high-power traces.
Compliance Information
RoHS-compliant Green Pb-free package per Microchip environmental compliance data. AEC-Q100 not applicable - this is a general-purpose industrial-grade MCU. Conflict-mineral statement available from Microchip's corporate compliance page.
