ATMEGA8HVA-4TU - 8KB AVR MCU 4MHz 28-TSOP | Microchip
料号： ATMEGA8HVA-4TU ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.89 | $4.89 |
| 10 | $4.55 | $45.50 |
| 100 | $4.2 | $420.00 |
| 500 | $3.95 | $1,975.00 |
| 1,000 | $3.7 | $3,700.00 |
ATMEGA8HVA-4TU 概述
An AVR microcontroller is an 8-bit RISC (Reduced Instruction Set Computing) MCU that belongs to the broader class of embedded processors within the power-management and control hierarchy of an electronic system. The AVR architecture executes most of its instructions in a single clock cycle, using a Harvard-architecture pipeline with separate program and data buses, which yields high code efficiency and deterministic real-time behavior.
Key features of the ATMEGA8HVA-4TU include 130 powerful instructions with mostly single-cycle execution, 23 general-purpose I/O lines, SPI serial connectivity, and in-system programmable Flash that allows firmware updates without removing the device from the board. The 1.8V to 9V operating range is the standout parameter: it lets the MCU run directly from automotive batteries, 9V supplies, or low-voltage logic rails without an intermediate regulator.
The 4MHz speed grade (suffix -4) balances performance against EMI and power consumption. Because the core runs at a modest clock, switching losses and radiated emissions stay low, which matters in electromagnetically noisy automotive and industrial environments.
Typical applications include automotive LIN/local-interconnect network nodes, industrial sensor and actuator control, and low-power battery-operated systems where the wide supply range removes a regulator stage.
Design consideration: this part is listed as obsolete in multiple distributor parametric databases, so plan a second-source or firmware-compatible successor before committing new designs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： ATMEGA8HVA-4TU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA8HVA-4TU （相同外形与封装尺寸） ——差异在于 Package, Architecture, Program Memory Size, EEPROM Size, Peripherals.
快速对比工具——选择替代料号进行并排对比：
ATMEGA16HVA-4TU
✅ 直接替换✓ 有现货
$2.42 / 个
查看数据手册 →ATMEGA8HVA-4CKU
✅ 直接替换✓ 有现货
$2.05 / 个
查看数据手册 →ATMEGA16HVA-4CKU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
联系询价
查看数据手册 →ATMEGA8HVA-4TU 最大额定值与电气特性
| Core Processor | AVR |
| Core Size | 8-bit |
| Architecture | Advanced RISC, 130 instructions |
| Max Clock Speed | 4 MHz |
| Flash Memory | 8 KB (4K x 16), In-System Programmable |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Supply Voltage Range | 1.8 V to 9 V |
| I/O Count | 23 |
| Connectivity | SPI |
| Peripherals | Brown-out detect/reset, POR, WDT |
| 封装 | 28-TSOP-I (0.465 in, 11.80 mm width) |
| 安装类型 | Surface Mount |
| Program Memory Type | Flash |
| Life Cycle Stage | Obsolete (per Octopart parametric data) |
| Packaging | Tray |
ATMEGA8HVA-4TU 28-tsop-i (0.465 in, 11.80 mm width) 引脚配置指南
ATMEGA8HVA-4TU（28-tsop-i (0.465 in, 11.80 mm width) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATMEGA8HVA-4TU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA8HVA-4TU 适用于 6 应用s: Automotive Body Electronics Nodes, Battery-Powered Sensor Nodes, Industrial Actuator and Motor Control, Home Appliance Control Panels, LIN Bus Slave Nodes, Handheld and Portable Instrumentation.
Automotive Body Electronics Nodes
The ATMEGA8HVA-4TU was developed specifically for automotive body-electronics modules such as door controllers, seat position nodes, and lighting subassemblies. Its 1.8V to 9V supply range directly tolerates battery-rail transients that would destroy standard 5.5V-maximum ATmega parts, eliminating one regulator stage and its associated quiescent current and failure modes. The 4MHz speed grade keeps switching edges slow, reducing radiated emissions and easing CISPR-style EMC filter design, while the 23 I/O lines drive lamps, relays, and switches directly. SPI connectivity interfaces with LIN transceivers or companion ASICs. Because Octopart lists the part obsolete, new automotive programs should migrate to current-production AEC-qualified AVR parts and reserve the 8HVA for sustaining existing module builds.
推荐
Battery-Powered Sensor Nodes
Battery-operated sensor and metering nodes benefit directly from the ATMEGA8HVA-4TU's 1.8V to 9V operating range, which lets a 9V alkaline pack or a discharged lithium cell power the MCU without a boost or LDO converter. At 4MHz the core draws minimal dynamic current, and the brown-out detector plus power-on reset ensures reliable startup as the battery discharges. The 512B EEPROM stores calibration constants and cumulative measurements through power cycles, while 8KB Flash holds protocol and filtering firmware. SPI connects external ADCs or RF transceivers. Designers should still account for the elevated current at higher supply voltages when optimizing battery life, and note the obsolete status by securing stock before committing a long-life product build.
推荐
Industrial Actuator and Motor Control
In industrial automation, the ATMEGA8HVA-4TU serves as a compact sequencer for actuators, valve drivers, and small DC motor controllers. The AVR RISC core executes most of its 130 instructions in a single clock cycle, giving deterministic timing for PWM generation and limit-switch polling at the 4MHz clock. Twenty-three I/O lines provide ample logic-level drive for gate drivers and indicator outputs, and SPI links Hall-effect or current-sense front ends. The 1.8V to 9V range accommodates unregulated industrial control rails found in older machinery retrofits. Brown-out detection prevents corrupted EEPROM writes during brown-out events. For new industrial designs, Microchip's active ATMEGA88PB-ANR offers higher speed and active lifecycle status at comparable cost.
推荐
Home Appliance Control Panels
Appliance control panels - washing machines, dishwashers, and small cooking appliances - traditionally use low-cost AVR MCUs with generous supply tolerance because appliance mains-derived DC rails are crudely regulated. The ATMEGA8HVA-4TU's 1.8V to 9V range absorbs these rail variations directly, its 23 I/O lines handle the button matrix, LED indicators, and relay drive, and the 4MHz clock keeps EMC compliance straightforward inside a metal-adjacent environment. The 512B EEPROM retains user settings and cycle counters across power interruptions, and in-system programmable Flash enables late-stage firmware changes on the production line. Given the obsolete classification, appliance makers should qualify ATMEGA16HVA-4TU or ATMEGA88PA-AUR as lifecycle-safe successors while consuming remaining stock.
推荐
LIN Bus Slave Nodes
Local Interconnect Network (LIN) slave nodes pair a low-cost MCU with a LIN transceiver, and the ATMEGA8HVA-4TU fits this role in automotive and industrial buses. The AVR core at 4MHz comfortably executes LIN 2.x slave protocol stacks within the 8KB Flash budget, SPI interfaces to the transceiver or can be bit-banged, and 23 I/O lines handle node-local loads such as lamps and position sensors. The 1.8V to 9V supply range rides automotive battery conditions, while brown-out reset guarantees the node reinitializes cleanly after crank events. Because the 8HVA is obsolete per Octopart data, new LIN designs should evaluate Microchip's current AVR automotive MCUs with integrated LIN support; this part remains appropriate for after-market and service replacement builds.
推荐
Handheld and Portable Instrumentation
Portable measurement tools, testers, and handheld controllers exploit the ATMEGA8HVA-4TU's ability to run directly from a 9V battery across its full discharge curve, eliminating the regulator that would otherwise add cost, quiescent drain, and a dropout floor. At 4MHz, the device balances responsiveness for menu-driven user interfaces with low average current, extending battery runtime. SPI interfaces to display drivers, ADCs, and EEPROM, while the 1KB SRAM buffers measurement samples and 512B EEPROM stores calibration data. The 28-TSOP surface-mount package suits compact two-layer boards. Engineering teams should note the part's obsolete status on Octopart and design end-of-life migration paths, ideally to ATMEGA88PA variants with matching toolchain support.
推荐
推荐产品汇总
工程参考数据： ATMEGA8HVA-4TU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA16HVA-4TU | ATMEGA8HVA-4CKU | ATMEGA16HVA-4CKU |
|---|---|---|---|---|
| Package | 28-TSOP-I (11.80 mm width) | 28-TSOP-I - same | 28-TSOP-I - same | 28-TSOP-I - same |
| Brand | Microchip Technology | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology (Atmel) |
| Flash Memory | 8 KB | 16 KB | 8 KB | 16 KB |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage Range | 1.8 V to 9 V | 1.8 V to 9 V | 1.8 V to 9 V | 1.8 V to 9 V |
| Core | AVR 8-bit RISC | AVR 8-bit RISC | AVR 8-bit RISC | AVR 8-bit RISC |
| Connectivity | SPI | SPI | SPI | SPI |
关键差异点
- Widest supply range in the ATmega8 class （对比 ATMEGA8A-MUR)
- Lower EMI and lower dynamic power speed grade （对比 ATMEGA88PA-AUR)
- Flash headroom upgrade without redesign （对比 ATMEGA16HVA-4TU)
设计说明
The ATMEGA8HVA-4TU tolerates 1.8V to 9V directly, but dynamic current scales roughly linearly with VCC, so powering from 9V when the firmware only needs 5V logic wastes battery life. Estimate: at a typical ATmega-class dynamic current of a few mA at 4MHz, doubling VCC nearly doubles average draw. If battery runtime dominates, add an efficient step-down stage or select the lowest VCC that satisfies peripheral voltage requirements, and enable sleep modes between polling cycles.
The 28-TSOP-I package uses a 0.8mm-class fine pitch on a narrow 11.80mm body. Route the SPI bus short and direct, and decouple VCC with a 100nF ceramic capacitor placed within 5mm of the supply pin plus a 4.7uF-10uF bulk capacitor near the power entry. Keep the reset trace away from the switching nodes of relay or motor drivers to prevent spurious brown-out resets. Use standard TSOP-28 land patterns per the PCB fabricator's capability check before releasing artwork.
Do not start new designs on this part: Octopart and datasheets.com both flag the ATMEGA8HVA-4TU as obsolete, so supply is limited to residual distributor stock (Heisener showed 7,944 pieces as of 2026-09-19). Also beware of conflicting web data - one summary cites a 16MHz clock, but DigiKey, Mouser, and Utmel converge on 4MHz; design timing margins to 4MHz. Finally, verify per-pin absolute maximum ratings, since the 9V supply range exceeds standard 5.5V ATmega logic levels when interfacing external ICs.
合规信息
Compliance data was not stated in the verified web data. The 'A' temperature suffix and automotive targeting of the HVA family suggest RoHS lead-free construction, but this must be confirmed on Microchip's official product page or certificate of conformance.
