ATMEGA8HVA-4TUR - AVR 8-Bit MCU 4MHz 8KB Flash | Microchip
MPN: ATMEGA8HVA-4TUR ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ATMEGA8HVA-4TUR Overview
A microcontroller unit (MCU) is a single-chip embedded computer that integrates a processor core, program memory, data memory, and peripheral interfaces on one die. The AVR ATmega family from Microchip (originally Atmel) sits within the broader hierarchy of 8-bit microcontrollers used in embedded control, sitting above discrete logic and below 32-bit application processors. The AVR core combines a rich instruction set with 32 general-purpose working registers, all directly connected to the arithmetic logic unit, allowing single-cycle instruction execution.
Key features of the ATMEGA8HVA-4TUR include the 8KB self-programmable FLASH organized as 4K x 16, a 4 MHz rated operating frequency suited to low-noise, low-EMI designs, and a high-voltage tolerant, open-drain IO pin that supports serial communication per the manufacturer datasheet. In-system programming is supported through 4 general-purpose IO ports that support SPI programming, allowing firmware updates on the assembled PCB without removing the device.
Technical context: the HVA variant of the ATmega8 family was developed for applications that must interface with higher-voltage domains, such as automotive battery-connected nodes and sensor conditioning circuits, where a standard MCU pin would be damaged. The AVR architecture's single-cycle execution delivers roughly 1 MIPS per MHz, so at 4 MHz the device provides approximately 4 MIPS of processing throughput.
Typical applications include automotive LIN-bus and body-electronics nodes, high-voltage sensor interfaces, battery management supervisory circuits, and industrial control modules that require SPI-programmable firmware in a compact 28-pin footprint.
A key design consideration: this device is listed as obsolete by multiple distributor comparison services, so new designs should evaluate drop-in alternatives such as the ATMEGA16HVA-4TU (same 28-TSOP footprint, 16KB FLASH) or plan a redesign to an active AVR or PIC part.
This page synthesizes distributor pricing signals, obsolescence status, drop-in alternative analysis, and practical design notes not found in a single manufacturer datasheet, giving engineers a complete sourcing and replacement picture in one place.
Drop-in alternatives for ATMEGA8HVA-4TUR — 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-4TUR (same form factor and footprint) — differing in Package, Architecture, Program Memory Size, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA16HVA-4TU
✅ Drop-In✓ In Stock
$2.42 / Unit
View Datasheet →ATMEGA8HVA-4CKU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.05 / Unit
View Datasheet →ATMEGA8HVA-4TUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Maximum Clock Speed | 4 MHz |
| Flash Program Memory | 8 KB (4K x 16) |
| Series | AVR ATmega ATMEGA8HVA |
| Package | 28-TSSOP (0.465 inch, 11.80 mm width) / 28-TSOP |
| Mounting Type | Surface Mount |
| Connectivity | SPI |
| Programming Interface | SPI programming via 4 general-purpose IO ports (in-system) |
| Special IO | High-voltage tolerant, open-drain IO pin with serial communication support |
| General Purpose Working Registers | 32 |
| Product Status | Obsolete (per Octopart and ICDirectory comparison data) |
ATMEGA8HVA-4TUR 28-tssop (0.465 inch, 11.80 mm width) / 28-tsop Pin Configuration Guide
Pin configuration for ATMEGA8HVA-4TUR (28-tssop (0.465 inch, 11.80 mm width) / 28-tsop 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-4TUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA8HVA-4TUR is suitable for 6 applications: Automotive Body Electronics Nodes, High-Voltage Sensor Interface Conditioning, Battery Management Supervisory Logic, Industrial Control and Automation Modules, Embedded Communication Bridges, Legacy Board Sustaining and Repair.
Automotive Body Electronics Nodes
The ATMEGA8HVA-4TUR fits automotive body-electronics and battery-connected nodes because its defining feature is a high-voltage tolerant, open-drain IO pin that supports serial communication with higher-voltage automotive domains, such as battery-sensed LIN-style buses. The 4 MHz AVR core delivers approximately 4 MIPS, adequate for switch monitoring, lamp control, and diagnostic messaging, while keeping switching noise and EMI low in electrically harsh 12V vehicle environments. In-system SPI programming through 4 general-purpose IO ports allows firmware updates during production and service without removing the device from the board. Because the part is obsolete, new automotive designs should migrate to active, AEC-Q100-qualified AVR ATmega automotive variants, using the ATMEGA16HVA-4TU only as a drop-in for sustaining existing platforms.
Recommended
High-Voltage Sensor Interface Conditioning
In high-voltage sensor interface circuits, the ATMEGA8HVA-4TUR is well suited because its high-voltage tolerant open-drain IO directly bridges the MCU logic domain to elevated-voltage sensor outputs without external level-shifting circuitry, reducing component count and failure points. The 8-bit AVR core with 32 general-purpose working registers executes single-cycle instructions, providing deterministic sampling loops for filtering and thresholding sensor signals at 4 MHz. The 8KB (4K x 16) FLASH accommodates calibration tables and communication stacks, and in-system SPI programming enables field recalibration of sensor scaling factors. Designers must budget for the obsolete status of this part: reserve stock or qualify the pin-compatible ATMEGA16HVA-4TU early in the program to avoid line-stoppage.
Recommended
Battery Management Supervisory Logic
Battery management and supervisory modules benefit from the ATMEGA8HVA-4TUR because battery-pack nodes routinely expose microcontroller pins to voltages above the logic rail; the HVA family's high-voltage tolerant open-drain pin tolerates these battery-connected serial links where a standard ATmega pin would be overstressed. At 4 MHz the device performs cell-voltage monitoring, under/over-voltage thresholding, and pack communication with approximately 4 MIPS of single-cycle AVR throughput and low EMI. The 8KB FLASH holds protection state machines and fault logging, while SPI in-system programming allows protection-threshold firmware updates on assembled packs. Given the obsolete lifecycle status, new battery designs should select active automotive AVR parts and treat this device as a last-time-buy component for legacy packs.
Recommended
Industrial Control and Automation Modules
The ATMEGA8HVA-4TUR serves compact industrial control modules where SPI connectivity, deterministic 8-bit control loops, and a space-saving 28-TSOP surface-mount footprint are priorities. The AVR core's 32 general-purpose working registers all connect directly to the ALU, enabling single-cycle arithmetic that keeps control-loop jitter low at 4 MHz, while the low clock frequency relaxes PCB layout and EMI requirements compared with faster MCUs. Its 8KB self-programmable FLASH supports field firmware updates, and the high-voltage tolerant IO can interface directly with 24V-domain signaling through minimal external protection. For new industrial designs, engineers should instead select active ATmega or ATmega88PA family parts, since this HVA variant is obsolete and long-term supply cannot be guaranteed by the manufacturer.
Recommended
Embedded Communication Bridges
The ATMEGA8HVA-4TUR works as a serial communication bridge between low-voltage logic and higher-voltage network segments, leveraging its high-voltage tolerant open-drain IO pin that supports serial communication per the ATmega8HVA/16HVA datasheet. The SPI interface and SPI-programmable general-purpose ports let the device forward protocol traffic between a host controller and high-voltage peripheral buses while executing framing, checksum, and retry logic in the 8KB FLASH. Running at 4 MHz, the AVR delivers roughly 4 MIPS, sufficient for moderate-bandwidth bridging with predictable latency because every instruction executes in a single clock cycle. Designers should map the bridge firmware memory usage carefully since 4K x 16 FLASH words fill quickly with dual protocol stacks, and consider the 16KB ATMEGA16HVA-4TU if stack growth is expected.
Recommended
Legacy Board Sustaining and Repair
The primary ongoing use of the ATMEGA8HVA-4TUR today is sustaining and repairing legacy printed circuit boards originally designed around the ATmega8HVA family, which is now obsolete. Because the device is soldered in a 28-TSOP (0.465 inch, 11.80 mm width) surface-mount footprint, repairs require hot-air or reflow rework equipment and tape-and-reel or tray stock from specialist distributors such as Wolfchip, which reported 37,000 pieces in stock as of Nov 12, 2025. Repair technicians should use in-system SPI programming to restore or update firmware after replacement, and verify programming via the 4 general-purpose IO ports before final board assembly. Where stock cannot be secured, the pin-compatible ATMEGA16HVA-4TU is the recommended sustaining substitute.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA8HVA-4TUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA16HVA-4TU | ATMEGA8HVA-4CKU | ATMEGA8A-PU |
|---|---|---|---|---|
| Package | 28-TSOP / 28-TSSOP (11.80 mm width) | 28-TSOP - same | 28-TSOP family package - same | 28-PDIP - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Core Size | AVR, 8-Bit | AVR, 8-Bit | AVR, 8-Bit | AVR, 8-Bit |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 16 MHz |
| Flash Memory | 8 KB (4K x 16) | 16 KB | 8 KB | 8 KB |
| High-Voltage Tolerant IO | Yes (open-drain, serial capable) | Yes | Yes | No |
| Connectivity | SPI | SPI | SPI | I2C, SPI, UART/USART |
Key Differentiators
- High-voltage tolerant open-drain IO pin (vs ATMEGA8A-PU)
- Upgrade path with doubled memory in the same footprint (vs ATMEGA16HVA-4TU)
- Ultra-low clock frequency for low-EMI designs (vs ATMEGA8A-PU)
Design Notes
The ATMEGA8HVA-4TUR is obsolete per Octopart and ICDirectory comparison data. Do not use it in new designs: any production schedule longer than a few months risks a line stop. For sustaining designs, qualify the pin-compatible ATMEGA16HVA-4TU (same 28-TSOP footprint, 16KB FLASH) and budget a firmware check since linker scripts and calibration addresses can differ between 8KB and 16KB memory maps. Standard ATmega8A parts are NOT drop-in: they lack the high-voltage tolerant IO and use different packages.
The 28-TSSOP footprint uses 0.65 mm pitch leads in an 11.80 mm body width. Route the SPI programming pins (shared with 4 general-purpose IO ports per the ATmega8HVA/16HVA datasheet) to an accessible header so in-system programming can be performed on assembled boards. Keep the high-voltage tolerant open-drain IO trace with adequate creepage/clearance to the elevated-voltage source it interfaces with; the pin tolerance does not remove PCB-level isolation requirements.
At 4 MHz the ATMEGA8HVA-4TUR generates inherently low EMI, but the high-voltage tolerant open-drain serial pin switches against a higher-voltage pull-up domain. Keep the pull-up resistor value conservative (per serial-link timing requirements) and route this line away from sensitive analog traces. Because the AVR core is fully static, the clock can be lowered for even lower noise in sensor-front-end applications without losing register contents.
Compliance Information
ICDirectory associates the ATmega8HVA series listing with automotive and AEC-Q100 keywords, but explicit AEC-Q100 qualification, RoHS, REACH, and lead-free declarations were not confirmed in the verified data for this exact ordering code. Request official compliance certificates from Microchip.
