ATMEGA8HVA-4CKU - 8KB AVR MCU, 4MHz, 36-LGA | Microchip
MPN: ATMEGA8HVA-4CKU ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.56 | $256.00 |
| 500 | $2.3 | $1,150.00 |
| 1,000 | $2.05 | $2,050.00 |
ATMEGA8HVA-4CKU Overview
A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the lowest tier of the embedded-computing hierarchy (MCU -> embedded processor -> SoC -> computing system). The AVR ATmega family from Atmel (now Microchip) uses an advanced RISC architecture with mostly single-cycle instruction execution, making it a popular choice for cost-sensitive embedded control.
Key features of the ATMEGA8HVA-4CKU include the high-performance, low-power AVR 8-bit RISC core, 8KB of self-programmable FLASH program memory, a 5-channel 12-bit analog-to-digital converter for direct sensor interfacing, and SPI serial communication for peripheral expansion. The device supports a wide supply range with operation noted at 2.5V, 3.3V, and 5V rails in distributor parametric listings.
From an architectural standpoint, the AVR core separates program and data buses (Harvard architecture), allowing most instructions to execute in a single clock cycle. This yields efficient MIPS-per-MHz performance, so a modest 4MHz clock is sufficient for many control loops, battery-monitoring tasks, and low-speed serial protocols. In-system programmability of the FLASH simplifies firmware updates in the field.
Typical applications include battery-powered portable devices, sensor nodes using the integrated 12-bit ADC, low-cost industrial control boards, and SPI-based peripheral controllers. The compact 36-LGA footprint suits space-constrained PCB designs.
When designing with this part, verify supply voltage and clock configuration against the official Microchip datasheet, as the HVA variant has device-specific operating ranges. Note that Octopart classifies this part as obsolete, so plan second-sourcing for new designs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA8HVA-4CKU — 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 ATMEGA8HVA-4CKU (same form factor and footprint) — differing in EEPROM Size, Program Memory Size, RAM Size, Package, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA16HVA-4CKUR
✅ Drop-In✓ In Stock
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View Datasheet →ATMEGA8HVA-4CKUR
✅ Drop-In✓ In Stock
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View Datasheet →ATMEGA8A-MUR
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$0.7 / Unit
View Datasheet →ATMEGA8HVA-4CKU Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Series | AVR ATmega, ATMEGA8HVA |
| Speed | 4 MHz |
| Program Memory Type | FLASH |
| Program Memory Size | 8 KB (4K x 16) |
| Program Memory Attribute | In-System Programmable |
| RAM Size | 512 B |
| EEPROM Size | 256 B |
| Connectivity | SPI |
| ADC Resolution | 12-bit |
| ADC Channels | 5 |
| Package | 36-WFLGA (6.5 x 3.5 mm) |
| Mounting Type | Surface Mount |
| Operating Supply (distributor listings) | 2.5 V / 3.3 V / 5 V rails |
| Peripherals | Brown-out Detect |
| Architecture | Advanced RISC, 8-bit AVR |
| Lifecycle Status | Obsolete (per Octopart); ACTIVE per some legacy datasheet listings |
ATMEGA8HVA-4CKU 36-wflga (6.5 x 3.5 mm) Pin Configuration Guide
Pin configuration for ATMEGA8HVA-4CKU (36-wflga (6.5 x 3.5 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA8HVA-4CKU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA8HVA-4CKU is suitable for 6 applications: Battery-Powered Portable Devices, Analog Sensor Nodes, Industrial Control Boards, SPI Peripheral Controllers, Battery Monitoring Front-Ends, Compact Embedded Control Modules.
Battery-Powered Portable Devices
The ATMEGA8HVA-4CKU fits battery-powered designs through its low-power AVR RISC core running at a modest 4MHz clock, which reduces dynamic current consumption compared to higher-clock parts, and its 256B EEPROM for storing calibration or user settings across power cycles. The 36-LGA package (6.5 x 3.5 mm) minimizes board area in handheld enclosures. Supply operation at 2.5V rails allows use with single-cell lithium or two-cell alkaline stacks via a simple regulator. Because most AVR instructions execute in a single clock cycle, firmware routines complete quickly, letting the MCU spend more time in sleep modes. Designers should implement sleep-state scheduling and use brown-out detect to prevent corrupt EEPROM writes at end-of-discharge voltages.
Recommended
Analog Sensor Nodes
The integrated 5-channel 12-bit ADC is the defining fit for this part in sensor-node applications: voltage, current, and temperature signals from up to five sensors can be digitized without an external converter, cutting BOM cost and board area. The HVA variant's positioning for high-voltage analog monitoring makes it suitable for battery-management sensing front-ends. The SPI interface streams converted samples to external FLASH or a host controller, while 512B of SRAM buffers sample windows for averaging or filtering. In practice, place a low-pass RC filter on each ADC input and average multiple conversions to reach the effective resolution the 12-bit converter offers; keep the analog ground path separate from switching loads to protect the ADC's noise floor.
Recommended
Industrial Control Boards
In low-cost industrial control, the ATMEGA8HVA-4CKU provides deterministic single-cycle AVR execution at 4MHz, sufficient for relay sequencing, threshold monitoring, and Modus-style polling over SPI. Brown-out detection ensures the MCU holds reset through supply dips common on factory floors, while the 5-channel 12-bit ADC reads potentiometers, current shunts, and thermal sensors directly. The in-system programmable FLASH permits field firmware updates without removing the device from the PCB. Operating with a 5V rail offers noise margins well suited to electrically noisy cabinets. Designers should add transient protection on I/O lines that leave the board and verify the obsolete status of this part - new industrial designs should qualify active megaAVR alternatives.
Recommended
SPI Peripheral Controllers
With SPI as its primary serial interface, the ATMEGA8HVA-4CKU serves well as a dedicated peripheral controller: driving displays, reading external ADCs or FLASH, or offloading fixed tasks from a host processor. The AVR core's fast register access enables tight SPI timing control in software, useful when bit-banging non-standard protocols. 8KB of FLASH accommodates a complete command parser plus protocol stack for such roles, and 512B SRAM holds packet buffers. Because SPI is full-duplex and clocked by the master, the 4MHz limit only constrains the slave-side response, not throughput on the bus. Keep SPI trace lengths short on the compact 6.5 x 3.5 mm LGA footprint and use series resistors to control ringing on SCK lines.
Recommended
Battery Monitoring Front-Ends
The HVA suffix denotes Atmel's high-voltage analog AVR line, originally targeted at battery monitoring: the 5-channel 12-bit ADC can sequentially sample cell voltages and a current-sense channel, while EEPROM stores learned battery parameters across resets. A 4MHz core executes coulomb-counting arithmetic and thresholds between samples with ample margin. Communication of state-of-charge data to a host occurs over SPI, and brown-out detect protects parameter integrity during deep discharge events. Estimated power budget: at typical AVR mA-class active current, continuous monitoring is feasible on mains-assisted systems, while duty-cycled sampling suits portable use. Confirm per-channel input voltage ranges in the official datasheet before connecting cells above the ADC reference.
Recommended
Compact Embedded Control Modules
For space-constrained modules - dongles, adapter boards, and mezzanine controllers - the 36-LGA (6.5 x 3.5 mm) WFLGA package delivers a small footprint with reasonable assembly feasibility for standard SMT lines. The device integrates all core functions on-chip: FLASH, SRAM, EEPROM, ADC, and SPI, minimizing external component count to decoupling capacitors and reset circuitry. The 4MHz clock can be generated internally, further reducing BOM. LGA pads require careful land-pattern design and paste stencil control since inspection under the package is limited; consider X-ray sampling in production. Because the part is obsolete, module designs should be qualified against ATMEGA16HVA-4CKUR or an active megaAVR part to protect long-term supply.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA8HVA-4CKU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA16HVA-4CKUR | ATMEGA8HVA-4CKUR | ATMEGA8A-MUR |
|---|---|---|---|---|
| Package | 36-LGA (6.5 x 3.5 mm) | 36-LGA - same footprint | 36-LGA - same footprint | VQFN-32 - different package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (FLASH) | 8 KB (4K x 16) | 16 KB | 8 KB (4K x 16) | 8 KB |
| Core Speed | 4 MHz | 4 MHz | 4 MHz | Up to 20 MHz |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Active |
| Core | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit |
| Series Family | AVR ATmega HVA | AVR ATmega HVA | AVR ATmega HVA | AVR ATmega (standard) |
| Supply Rails (distributor listings) | 2.5 V / 3.3 V / 5 V | 2.5 V / 3.3 V / 5 V | 2.5 V / 3.3 V / 5 V | 1.8 V - 5.5 V |
| Packaging | Tray | Tape & Reel | Tape & Reel | Tape & Reel |
Key Differentiators
- HVA high-voltage analog line with 12-bit ADC (vs ATMEGA8A-MUR)
- Compact 36-LGA footprint (vs ATMEGA8A-MUR)
- Flash headroom upgrade path on the same footprint (vs ATMEGA16HVA-4CKUR)
Design Notes
The ATMEGA8HVA-4CKU is classified as Obsolete by Octopart (as of 2026-09-19), while some legacy datasheet databases still show an ACTIVE life-cycle stage from original publication. Before any new design-in, confirm stock with your distributor and pre-qualify the ATMEGA16HVA-4CKUR (same 36-LGA footprint, 16KB FLASH) as a second source. Locking a single obsolete source into a production BOM is the highest-risk failure mode for this part number.
The 36-LGA (6.5 x 3.5 mm) package uses pad-array contacts hidden under the body, so solder joints cannot be visually inspected. Follow the mechanical land-pattern drawing in the official Microchip datasheet exactly, design solder-mask-defined pads per the recommended geometry, and specify a stencil thickness that yields adequate paste volume on each pad. Include fiducials near the package and plan X-ray sampling for production quality control of LGA joints.
Distributor parametric sources list differing supply ranges (FindIC: 2.5V/3.3V/5V rails; digchip.org: 4.5V-5.5V for the 5V suffix). This is normal for AVR speed-grade suffixes - higher clock grades require higher minimum VCC. Before finalizing the power tree, read the operating-voltage-versus-frequency curve for the -4C (4MHz) grade in the official Microchip datasheet and enable brown-out detection at a threshold appropriate to your rail so EEPROM writes are protected during brownouts.
Compliance Information
Compliance data was not present in the provided web search results. Verify RoHS/REACH status on the official Microchip product page before procurement.
