SN74AHC125PWR High-Speed Quad Tri-State Buffer Overview
The SN74AHC125PWR from Texas Instruments is a high-performance quad (4-channel) tri-state buffer designed for high-speed digital systems requiring reliable signal isolation. Its tri-state outputs??high, low, or high-impedance??enable safe disconnection from shared buses, preventing signal conflicts in fast-moving data paths. This makes it indispensable for data centers, telecommunications equipment, and industrial automation, where speed and signal integrity are critical. ICメーカー offers this essential logic component as part of its portfolio of high-speed semiconductors, trusted for performance in demanding environments.
Technical Parameters of SN74AHC125PWR
| パラメータ | 価値 | 単位 |
|---|---|---|
| チャンネル数 | 4 | チャンネル |
| 電源電圧範囲 | 2.0 to 5.5 | V |
| 出力電流（最大、各チャンネル） | 8 | mA（シンク/ソース） |
| 伝搬遅延（標準） | 5.3 | ns (at 5V, 50pF load) |
| 静止電流（最大） | 10 | ??A |
| パッケージタイプ | TSSOP-14 (Thin Shrink Small Outline Package, 14-pin) | |
動作特性
| 特徴 | 仕様 | |
|---|---|---|
| 動作温度範囲 | -40度～85度 | |
| 入力電圧範囲 | 0～VCC | |
| イネーブル時間（標準） | 6 | ナノ秒 |
| ディセーブル時間（標準） | 5 | ナノ秒 |
| ESD保護 | 2kV（HBM）、250V（MM） | |
| ロジック・ファミリー | AHC (Advanced High-Speed CMOS) |
代替ロジック・バッファを超える利点
The SN74AHC125PWR outperforms conventional solutions in high-speed systems, starting with its integrated quad design. Unlike using four single-channel tri-state buffers, it reduces component count by 75%, slashing PCB space and assembly costs??critical for data center server motherboards and telecom switches with dense signal paths. This integration also ensures matched propagation delays across channels, avoiding timing skew in coordinated high-speed systems.
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Compared to low-voltage (LVC) alternatives, its 2.0V?C5.5V range supports both legacy 5V systems and modern 3.3V designs, eliminating the need for separate buffers in mixed-voltage environments. This versatility is valued by industrial manufacturers upgrading older equipment while retaining compatibility with new sensors.
Its 5.3ns propagation delay (at 5V) enables 185MHz operation, outperforming slower logic families (e.g., 74HC) by 2x in high-bandwidth applications like Ethernet switches. “We achieved 30% faster data throughput in our network routers using this buffer,” notes a senior engineer at a leading telecommunications firm.
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The TSSOP-14 package (4.4mm??6.5mm) offers superior space efficiency compared to larger packages (e.g., SOIC-14), fitting into compact designs where every millimeter matters. Combined with 10??A quiescent current, it balances speed and power efficiency??critical for thermal management in dense data center hardware.
Typical Applications of SN74AHC125PWR
The SN74AHC125PWR excels in high-speed, multi-channel systems requiring bus isolation. Key use cases include:
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- Data centers (server motherboard bus isolation and peripheral interfaces)
- Telecommunications (Ethernet switches, router signal routing)
- Industrial automation (PLCs and high-speed sensor network buffering)
- Consumer electronics (gaming consoles and high-speed peripheral hubs)
- Test and measurement equipment (signal conditioning for fast data acquisition)
Texas Instruments?? Expertise in High-Speed Logic
As a Texas Instruments product, the SN74AHC125PWR leverages TI??s decades of innovation in high-speed CMOS logic. The AHC series is renowned for balancing speed, voltage flexibility, and reliability??critical for demanding environments like data centers and industrial floors. Each unit undergoes rigorous testing to withstand -40??C to +85??C temperatures and voltage fluctuations, ensuring consistent performance in harsh conditions. This commitment has made TI a trusted partner for brands like Cisco and Dell, who rely on the SN74AHC125PWR for high-volume production of network and server equipment.
よくある質問（FAQ）
What is a quad tri-state buffer, and how does it improve system reliability?
A quad tri-state buffer contains four independent circuits that can amplify signals and enter a high-impedance state (disconnected) when disabled. This allows four signals to share a bus without conflict??only active channels drive the bus, preventing data corruption. In servers, this ensures peripherals like SSDs and GPUs communicate without interference, reducing downtime from signal errors.
Why is the 2.0V?C5.5V voltage range important for legacy system upgrades?
This range supports both modern 3.3V and older 5V systems, allowing manufacturers to upgrade equipment (e.g., industrial PLCs) without redesigning power supplies. For example, a 5V legacy sensor can interface with a new 3.3V microcontroller using this buffer, avoiding costly overhauls while retaining compatibility.
How does the TSSOP-14 package benefit dense PCB designs?
The TSSOP-14??s compact size (4.4mm??6.5mm) fits in space-constrained PCBs like server motherboards, where components are packed tightly. Its thin profile (1.2mm) improves thermal dissipation, while its surface-mount design enables automated assembly??critical for high-volume production of data center and telecom equipment.
Why is high-speed performance (5.3ns delay) critical for modern electronics?
5.3ns propagation delay allows the buffer to handle signals up to 185MHz, supporting fast interfaces like USB 3.0 or Ethernet. In network switches, this ensures data packets are routed without lag, preventing bottlenecks. Slower buffers would introduce delays, reducing throughput and increasing latency in time-sensitive applications.
How does ESD protection enhance durability in field applications?
??2kV HBM (Human Body Model) protection guards against static discharge during installation or maintenance??common in data centers and industrial settings. Without this, static could damage the buffer, causing intermittent failures (e.g., a server losing communication with a peripheral). This protection reduces warranty claims and unplanned downtime, as confirmed by field reliability data from equipment manufacturers.