ATMEGA8HVA-4TUR - AVR 8-Bit MCU 4MHz 8KB Flash | Microchip
部品番号: ATMEGA8HVA-4TUR ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ATMEGA8HVA-4TUR 概要
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.
ドロップイン代替品: ATMEGA8HVA-4TUR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATMEGA8HVA-4TUR （同一形状・フットプリント） — 相違点: Package, Architecture, Program Memory Size, Series.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA16HVA-4TU
✅ ドロップイン✓ 在庫あり
$2.42 / 個
データシートを見る →ATMEGA8HVA-4CKU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.05 / 個
データシートを見る →ATMEGA8HVA-4TUR 最大定格＆電気的特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Maximum Clock Speed | 4 MHz |
| Flash Program Memory | 8 KB (4K x 16) |
| Series | AVR ATmega ATMEGA8HVA |
| パッケージ | 28-TSSOP (0.465 inch, 11.80 mm width) / 28-TSOP |
| 実装タイプ | 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 ピン配置ガイド
ATMEGA8HVA-4TUR (28-tssop (0.465 inch, 11.80 mm width) / 28-tsop パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: ATMEGA8HVA-4TUR.
詳細は データシート をご参照ください。
主な用途
ATMEGA8HVA-4TUR の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATMEGA8HVA-4TUR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- 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)
設計ノート
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.
コンプライアンス情報
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.
