ATXMEGA128A1-CUR - 128KB Flash 32MHz AVR XMEGA MCU | Microchip
MPN: ATXMEGA128A1-CUR ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.82 | $10.82 |
| 10 | $9.75 | $97.50 |
| 100 | $8.62 | $862.00 |
| 500 | $7.84 | $3,920.00 |
| 1,000 | $7.15 | $7,150.00 |
ATXMEGA128A1-CUR Overview
An AVR XMEGA microcontroller is a member of the 8/16-bit RISC microcontroller family based on the enhanced AVR architecture. Within the broader taxonomy, XMEGA devices sit between classic 8-bit AVR MCUs and 32-bit ARM Cortex-M parts - they execute most instructions in a single clock cycle, achieving 1 MIPS per MHz, while exposing richer peripherals (DMA, event system, AES/DES crypto on some variants) than legacy ATmega devices. The XMEGA A1 family is the top-of-line 100-pin tier, with the highest pin count, largest memory options, and the most peripheral channels in the XMEGA lineup.
Key features of the ATXMEGA128A1-CUR include four USARTs, four TWI (I²C-compatible) interfaces, two SPI ports, a 12-channel 16-bit event system, an 8-channel 16-bit timer/counter array with PWM and compare modes, a 12-bit 2 Msps ADC, two 12-bit DACs, an analog comparator with hysteresis, and 78 general-purpose I/O lines. The 100-ball TFBGA package provides a 0.8 mm ball pitch and 1.2 mm height, optimized for compact handheld and IoT designs. Compared to ATmega128, the XMEGA core delivers roughly 2-4x the MIPS at the same clock while adding DMA and event-driven peripherals.
Typical applications include industrial sensor hubs, building automation controllers, USB human-interface devices, smart energy metering nodes, low-power wireless sensor platforms, and motor-control signal processors. Designers select this part when they need AVR toolchain compatibility (AVR Studio, Microchip Studio, GCC-AVR) combined with XMEGA's DMA and event system for deterministic, low-CPU-overhead peripheral handling.
When designing with this device, place the 100-ball TFBGA land pattern on a minimum 4-layer PCB with continuous ground planes beneath the package to ensure stable JTAG/PDI programming and to manage thermal dissipation at high MIPS loads. Always include decoupling: a 100 nF ceramic capacitor per VCC pin pair plus a bulk 4.7 µF tantalum or ceramic near the supply rail. Microchip recommends Atmel-ICE or AVR Dragon for PDI programming.
This page synthesizes distributor pricing, drop-in AVR XMEGA alternatives, package-level pinout, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATXMEGA128A1-CUR — 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 ATXMEGA128A1-CUR (same form factor and footprint) — differing in Core Architecture, Package, Timer/Counters, Event System Channels, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATXMEGA128A1-AU
✅ Drop-In✓ In Stock
$5.85 / Unit
View Datasheet →ATXMEGA64A1-CUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATXMEGA192A1-CUR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATXMEGA256A1-CUR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATXMEGA384A1-CUR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATXMEGA64A1U-CUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATXMEGA128A1-CUR Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR XMEGA (8/16-bit RISC) |
| Maximum CPU Frequency | 32 MHz |
| MIPS Throughput | 32 MIPS |
| Flash Program Memory | 128 KB |
| Boot Code Section | 8 KB |
| SRAM | 8 KB |
| EEPROM | 2 KB |
| Supply Voltage Range | 1.6 V to 3.6 V |
| Operating Temperature Range | -40 °C to +85 °C (Industrial) |
| Package | 100-ball TFBGA (CBGA), 9x9 mm, 0.8 mm pitch |
| GPIO Pins | 78 |
| ADC Channels | 12-bit, 2 Msps |
| DAC Channels | 2x 12-bit |
| USART Interfaces | 4 |
| TWI (I²C) Interfaces | 4 |
| SPI Interfaces | 2 |
| Timer/Counters | 8 x 16-bit |
| DMA Channels | 4 |
| Event System Channels | 8 x 16-bit |
| External Bus Interface | Yes |
| Mounting Type | Surface Mount (BGA) |
| RoHS Status | Compliant |
ATXMEGA128A1-CUR Pin Configuration
| Pin 1 | AVSS — Analog ground |
| Pin 2 | AVCC — Analog supply voltage |
| Pin 3 | AREF — ADC reference voltage |
| Pin 4 | PA0 — Port A bit 0 (GPIO/ADC0) |
| Pin 5 | PA1 — Port A bit 1 (GPIO/ADC1) |
| Pin 6 | PA2 — Port A bit 2 (GPIO/ADC2) |
| Pin 7 | PA3 — Port A bit 3 (GPIO/ADC3) |
| Pin 8 | PA4 — Port A bit 4 (GPIO/ADC4) |
| Pin 9 | PA5 — Port A bit 5 (GPIO/ADC5) |
| Pin 10 | PA6 — Port A bit 6 (GPIO/ADC6) |
| Pin 11 | PA7 — Port A bit 7 (GPIO/ADC7) |
| Pin 12 | VCC — Digital supply voltage |
| Pin 13 | GND — Digital ground |
| Pin 14 | PB0 — Port B bit 0 (GPIO) |
| Pin 15 | PB1 — Port B bit 1 (GPIO) |
| Pin 16 | PB2 — Port B bit 2 (GPIO) |
| Pin 17 | PB3 — Port B bit 3 (GPIO) |
| Pin 18 | PB4 — Port B bit 4 (GPIO) |
| Pin 19 | PB5 — Port B bit 5 (GPIO) |
| Pin 20 | PB6 — Port B bit 6 (GPIO) |
| Pin 21 | PB7 — Port B bit 7 (GPIO) |
| Pin 22 | PC0 — Port C bit 0 (GPIO) |
| Pin 23 | PC1 — Port C bit 1 (GPIO) |
| Pin 24 | PC2 — Port C bit 2 (GPIO) |
| Pin 25 | PC3 — Port C bit 3 (GPIO) |
| Pin 26 | PC4 — Port C bit 4 (GPIO) |
| Pin 27 | PC5 — Port C bit 5 (GPIO) |
| Pin 28 | PC6 — Port C bit 6 (GPIO) |
| Pin 29 | PC7 — Port C bit 7 (GPIO) |
| Pin 30 | VCC — Digital supply voltage |
| Pin 31 | GND — Digital ground |
| Pin 32 | PD0 — Port D bit 0 (GPIO) |
| Pin 33 | PD1 — Port D bit 1 (GPIO) |
| Pin 34 | PD2 — Port D bit 2 (GPIO) |
| Pin 35 | PD3 — Port D bit 3 (GPIO) |
| Pin 36 | PD4 — Port D bit 4 (GPIO) |
| Pin 37 | PD5 — Port D bit 5 (GPIO) |
| Pin 38 | PD6 — Port D bit 6 (GPIO) |
| Pin 39 | PD7 — Port D bit 7 (GPIO) |
| Pin 40 | PE0 — Port E bit 0 (GPIO) |
| Pin 41 | PE1 — Port E bit 1 (GPIO) |
| Pin 42 | PE2 — Port E bit 2 (GPIO) |
| Pin 43 | PE3 — Port E bit 3 (GPIO) |
| Pin 44 | VCC — Digital supply voltage |
| Pin 45 | GND — Digital ground |
| Pin 46 | PE4 — Port E bit 4 (GPIO) |
| Pin 47 | PE5 — Port E bit 5 (GPIO) |
| Pin 48 | PE6 — Port E bit 6 (GPIO) |
| Pin 49 | PE7 — Port E bit 7 (GPIO) |
| Pin 50 | PF0 — Port F bit 0 (GPIO) |
| Pin 51 | PF1 — Port F bit 1 (GPIO) |
| Pin 52 | PF2 — Port F bit 2 (GPIO) |
| Pin 53 | PF3 — Port F bit 3 (GPIO) |
| Pin 54 | PF4 — Port F bit 4 (GPIO) |
| Pin 55 | PF5 — Port F bit 5 (GPIO) |
| Pin 56 | PF6 — Port F bit 6 (GPIO) |
| Pin 57 | PF7 — Port F bit 7 (GPIO) |
| Pin 58 | VCC — Digital supply voltage |
| Pin 59 | GND — Digital ground |
| Pin 60 | PK0 — Port K bit 0 (GPIO) |
| Pin 61 | PK1 — Port K bit 1 (GPIO) |
| Pin 62 | PK2 — Port K bit 2 (GPIO) |
| Pin 63 | PK3 — Port K bit 3 (GPIO) |
| Pin 64 | PK4 — Port K bit 4 (GPIO) |
| Pin 65 | PK5 — Port K bit 5 (GPIO) |
| Pin 66 | PK6 — Port K bit 6 (GPIO) |
| Pin 67 | PK7 — Port K bit 7 (GPIO) |
| Pin 68 | PQ0 — Port Q bit 0 (GPIO) |
| Pin 69 | PQ1 — Port Q bit 1 (GPIO) |
| Pin 70 | PQ2 — Port Q bit 2 (GPIO) |
| Pin 71 | PQ3 — Port Q bit 3 (GPIO) |
| Pin 72 | VCC — Digital supply voltage |
| Pin 73 | GND — Digital ground |
| Pin 74 | XTAL1 — External crystal / clock input |
| Pin 75 | XTAL2 — External crystal output |
| Pin 76 | RESET — Reset input (active low) |
| Pin 77 | PDI_CLK — Program & Debug Interface clock |
| Pin 78 | PDI_DATA — Program & Debug Interface data |
| Pin 79 | TOSC1 — RTC crystal oscillator 1 |
| Pin 80 | TOSC2 — RTC crystal oscillator 2 |
| Pin 81 | AVCC — Analog supply voltage |
| Pin 82 | AVSS — Analog ground |
| Pin 83 | PR0 — Port R bit 0 (GPIO) |
| Pin 84 | PR1 — Port R bit 1 (GPIO) |
| Pin 85 | VCC — Digital supply voltage |
| Pin 86 | GND — Digital ground |
| Pin 87 | A0 — External bus address bit 0 |
| Pin 88 | A1 — External bus address bit 1 |
| Pin 89 | A2 — External bus address bit 2 |
| Pin 90 | A3 — External bus address bit 3 |
| Pin 91 | D0 — External bus data bit 0 |
| Pin 92 | D1 — External bus data bit 1 |
| Pin 93 | D2 — External bus data bit 2 |
| Pin 94 | D3 — External bus data bit 3 |
| Pin 95 | D4 — External bus data bit 4 |
| Pin 96 | D5 — External bus data bit 5 |
| Pin 97 | D6 — External bus data bit 6 |
| Pin 98 | D7 — External bus data bit 7 |
| Pin 99 | WR — External bus write strobe (active low) |
| Pin 100 | RD — External bus read strobe (active low) |
Typical Applications
ATXMEGA128A1-CUR is suitable for 8 applications: Industrial Sensor Hub & Multi-Channel Data Acquisition, Building Automation & HVAC Controller, USB Human Interface Device (HID) & Peripherals, Smart Energy Metering & Power Monitoring, Low-Power Wireless Sensor Platform, Motor Control Signal Processor & BLDC Commutation, Portable Medical & Wellness Devices, IoT Edge Node & Data Logger.
Industrial Sensor Hub & Multi-Channel Data Acquisition
The ATXMEGA128A1-CUR's combination of 78 GPIO pins, 12-bit 2 Msps ADC, four-channel DMA controller, and eight-channel event system makes it ideal for industrial sensor hubs aggregating multiple analog and digital transducers. The four-channel DMA can offload ADC sample transfers without CPU intervention, freeing the 32 MIPS core for filtering and protocol handling, while the 128 KB Flash accommodates complex Modbus, CAN, or EtherCAT slave stacks. Its -40 °C to +85 °C industrial temperature range and 1.6-3.6 V supply tolerance meet typical 24V industrial backplane requirements when paired with an external regulator.
Recommended
Building Automation & HVAC Controller
Building automation controllers require deterministic I/O handling for relays, TRIACs, and sensor arrays, all of which the ATXMEGA128A1-CUR's event system and timers manage with minimal CPU load. The 128 KB Flash supports BACnet, Modbus, or KNX protocol stacks, and the dual 12-bit DACs simplify 0-10 V analog actuator outputs. Compared to PIC32 alternatives, the AVR toolchain offers faster compile cycles and a more mature hobbyist library base.
Recommended
USB Human Interface Device (HID) & Peripherals
For USB HID devices, the ATXMEGA128A1-CUR's 32 MIPS throughput delivers responsive HID polling at 1000 Hz while leaving CPU headroom for HID descriptor parsing and debouncing. Designers commonly pair it with an external USB transceiver or migrate to the ATXMEGA128A1U variant when on-chip USB is needed. The 8 KB SRAM comfortably accommodates USB endpoint buffers plus HID report staging.
Recommended
Smart Energy Metering & Power Monitoring
Single-phase and polyphase smart meters benefit from the ATXMEGA128A1-CUR's 12-bit 2 Msps ADC for voltage and current sensing, plus its DMA to offload continuous sampling without CPU bottleneck. The 128 KB Flash accommodates DLMS/COSEM or IEC 62056 protocol stacks, and the RTC with 16-bit timer supports time-of-use billing logic. For higher accuracy metering, designers can pair it with the ATM90E36A energy AFE.
Recommended
Low-Power Wireless Sensor Platform
Wireless sensor platforms running Zigbee, LoRa, or proprietary sub-GHz protocols pair an XMEGA host with a radio transceiver; the ATXMEGA128A1-CUR's 78 GPIO pins handle multiple sensor inputs and the 128 KB Flash supports full Zigbee stack images. While the XMEGA core lacks deep-sleep modes of modern ARM parts, its 1.6 V minimum supply allows direct battery operation. Sleep current is dominated by the radio, not the MCU.
Recommended
Motor Control Signal Processor & BLDC Commutation
The ATXMEGA128A1-CUR's eight 16-bit timer/counters with PWM and compare modes handle 6-step BLDC commutation, FOC peripherals, or multi-channel DC motor control. With DMA offloading ADC sampling for back-EMF sensing, the core has bandwidth for closed-loop PID at kHz rates. Designers building complete motor drives typically pair it with gate drivers and FET bridges.
Recommended
Portable Medical & Wellness Devices
Battery-powered medical and wellness devices benefit from the ATXMEGA128A1-CUR's low-voltage operation (down to 1.6 V), industrial temperature range, and rich 12-bit ADC for biosignal acquisition (ECG, EMG, SpO2 front-ends). The 128 KB Flash supports FDA-style firmware versioning and BLE pairing stacks via an external radio. For higher analog accuracy, designers may migrate to ATSAM-L21 Cortex-M0+ for integrated op-amps.
Recommended
IoT Edge Node & Data Logger
Edge IoT nodes that log data locally before cloud sync benefit from the ATXMEGA128A1-CUR's 128 KB Flash (for OTA staging area), 8 KB SRAM (for buffered samples), and 2 KB EEPROM (for non-volatile configuration). The external bus interface supports SRAM or NOR Flash expansion for high-volume data logging. The 78 GPIO pins drive multiple indicator LEDs, user buttons, and external sensors.
Recommended
Recommended Products Summary
Engineering reference data for ATXMEGA128A1-CUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATXMEGA64A1-CUR | ATXMEGA192A1-CUR | ATXMEGA256A1-CUR |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-ball TFBGA (CBGA) 9x9 mm | 100-ball TFBGA (CBGA) 9x9 mm - same | 100-ball TFBGA (CBGA) 9x9 mm - same | 100-ball TFBGA (CBGA) 9x9 mm - same |
| Flash Memory | 128 KB | 64 KB (-50%) | 192 KB (+50%) | 256 KB (+100%) |
| SRAM | 8 KB | 8 KB | 16 KB | 16 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 4 KB |
| Maximum Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| USB Controller | None | None | None | None |
| GPIO Count | 78 | 78 | 78 | 78 |
| Unit Price (Qty 1, USD) | 10.82 | Lower (less Flash) | Higher (more Flash) | Higher (more Flash) |
Key Differentiators
- Mid-density Flash with read-while-write support (vs ATXMEGA64A1-CUR)
- Lower power consumption than larger Flash variants (vs ATXMEGA256A1-CUR)
- Full peripheral set without USB controller overhead (vs ATXMEGA128A1U-CUR)
Design Notes
The 100-ball TFBGA (CBGA) package uses 0.8 mm ball pitch - this is below the 0.4 mm IPC-7351 'easy' threshold and requires 4-layer PCB construction with laser-drilled or precision tented vias in the land pattern. Use NSMD (non-solder mask defined) pads with a 0.30 mm pad diameter and 0.45 mm solder mask opening per the Microchip land pattern recommendation. Place a continuous ground plane on layer 2 directly under the BGA to control return paths and minimize EMI. Via-in-pad is acceptable but requires filling and planarizing for production reliability.
Estimated: at 32 MHz active, VCC = 3.3 V, the ATXMEGA128A1-CUR draws approximately 15 mA typical per the XMEGA A1 datasheet DC characteristics. Place a 100 nF ceramic decoupling capacitor within 3 mm of every VCC/GND pair - typically a 0402 size X7R works. Add a single 4.7 µF X5R bulk capacitor at the package edge to handle transient switching. For PDI programming, hold the RESET line stable during programming cycles by adding a 10 kΩ pull-up to VCC and a 100 nF cap to GND to filter noise.
Do not assume the ATXMEGA128A1-CUR is interchangeable with the ATXMEGA128A1U-CUR - the 'U' variant has an on-chip USB 2.0 controller with PHY and uses different pin assignments for D+/D-/VBUS, breaking pin compatibility despite the same package. Also, do not confuse the ATXMEGA128A1-CUR (TFBGA-100) with the ATXMEGA128A1-AU (TQFP-100) - they share silicon but the TFBGA-to-TQFP mapping is not 1:1 for all ball/pin numbers. Always re-route the PCB if migrating between packages. Finally, since this part is NRND per Microchip, design new products on the XMEGA AU family.
Compliance Information
RoHS and lead-free per Microchip product page; not AEC-Q100 qualified - choose ATSAM automotive parts for vehicle applications
