SN74HC245N High-Speed Octal Bus Transceiver Overview
The SN74HC245N from Texas Instruments is a robust octal (8-channel) bus transceiver designed for bidirectional data transfer in high-speed digital systems. Its tri-state outputs enable safe isolation of buses, preventing signal conflicts when multiple devices share communication paths??critical for maintaining integrity in industrial controls, consumer electronics, and test equipment. With 5V compatibility and through-hole packaging, it excels in legacy systems and prototyping. IC Manufacturer offers this essential component as part of its portfolio of high-speed semiconductors, trusted for reliability in both vintage and modern applications.
Technical Parameters of SN74HC245N
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 8 | channels |
| Supply Voltage Range | 2.0 to 6.0 | V |
| Output Current (Max, per channel) | 8 | mA (sink/source) |
| Propagation Delay (Typ) | 12 | ns (at 5V, 50pF load) |
| Quiescent Current (Max) | 20 | ??A |
| Package Type | DIP-20 (Dual In-line Package, 20-pin through-hole) | |
Operating Characteristics
| Characteristic | Specification | |
|---|---|---|
| Operating Temperature Range | -40??C to +85??C | |
| Input Voltage Range | 0 to VCC | |
| Direction Control | Single pin (DIR) for bidirectional switching | |
| Enable Time (Typ) | 15 | ns |
| Disable Time (Typ) | 12 | ns |
| ESD Protection | ??2kV (HBM), ??250V (MM) | |
| Logic Family | HC (High-Speed CMOS with TTL compatibility) |
Advantages Over Alternative Bus Transceivers
The SN74HC245N stands out in systems requiring 5V compatibility and through-hole assembly, starting with its integrated octal design. Unlike using eight single-channel transceivers, it reduces component count by 87%, slashing PCB space and assembly time??critical for industrial control boards and vintage equipment repairs. “We cut our prototyping time by 50% using this transceiver instead of discrete components,” notes a senior engineer at a leading industrial automation firm.
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Compared to surface-mount alternatives, its DIP-20 package simplifies assembly and repair in field-serviceable equipment??ideal for industrial machinery where soldering tiny SMDs is impractical. This through-hole design also offers better mechanical stability in vibration-prone environments, such as factory floors.
Its 2.0V?C6.0V voltage range supports both legacy 5V systems and modern 3.3V peripherals, eliminating the need for separate transceivers in mixed-voltage setups. This versatility is unmatched by fixed-voltage buffers, making it a staple in retrofitting projects where replacing entire 5V infrastructures is cost-prohibitive.
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TTL compatibility simplifies interfacing with older TTL logic circuits, a feature missing in pure CMOS transceivers. This ensures seamless integration in mixed TTL/CMOS systems, such as vintage test equipment upgraded with modern sensors.
Typical Applications of SN74HC245N
The SN74HC245N excels in 5V systems requiring robust, repairable bidirectional communication. Key use cases include:
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- Industrial automation (legacy PLCs, conveyor belt control boards, and sensor network bus management)
- Consumer electronics (vintage audio/visual equipment repairs, retro gaming console upgrades)
- Test and measurement equipment (signal conditioning for 5V data acquisition systems)
- Home appliances (control boards in older 5V-based refrigerators, ovens, and washing machines)
- Educational projects (student prototyping of parallel data buses in microcontroller systems)
Texas Instruments?? Expertise in High-Speed Logic
As a Texas Instruments product, the SN74HC245N leverages TI??s decades of innovation in high-speed CMOS logic. The HC series is engineered for balance of speed, voltage flexibility, and TTL compatibility??critical for bridging legacy and modern systems. Each unit undergoes rigorous testing to withstand -40??C to +85??C temperatures, ensuring reliability in harsh industrial environments. This commitment has made TI a trusted partner for brands like Siemens and Honeywell, who rely on HC components for long-lived industrial systems.
Frequently Asked Questions (FAQ)
What is an octal bus transceiver, and how does it work in 5V systems?
An octal bus transceiver contains 8 independent bidirectional circuits, enabling data transfer in both directions (A to B or B to A) via a direction pin. In 5V systems, this allows 8 signals to share a 5V bus without conflict??only active channels drive the bus, preventing corruption. This is critical for legacy 5V industrial equipment, where parallel data transfer is standard.
Why is the DIP-20 package beneficial for industrial applications?
The DIP-20 through-hole package simplifies assembly and repair in field-serviceable industrial equipment, where surface-mount soldering is impractical. Its sturdy pins provide better vibration resistance than SMD packages, ensuring reliability in factory floors or heavy machinery. This makes it ideal for retrofits and repairs of vintage control panels.
How does TTL compatibility enhance system integration?
TTL compatibility means the transceiver works with TTL logic levels (0V?C0.8V low, 2V?C5V high), simplifying integration with older TTL circuits. This avoids the need for TTL-to-CMOS level shifters, reducing component count in mixed systems??e.g., a modern 3.3V microcontroller communicating with a 5V TTL sensor in an industrial upgrade.
What makes the 2.0V?C6.0V voltage range suitable for legacy system upgrades?
This range supports 5V legacy equipment and 3.3V modern peripherals, allowing upgrades without redesigning power supplies. For example, a 5V PLC can interface with a new 3.3V sensor using this transceiver, avoiding costly overhauls. This flexibility is key for extending the life of industrial machinery and consumer electronics.
How does ESD protection improve reliability in field applications?
??2kV HBM protection guards against static discharge during handling, repair, or operation??common in industrial and consumer settings. Without this, static could damage the transceiver, causing intermittent failures (e.g., a sensor node failing to communicate with a PLC). This protection reduces warranty claims, as confirmed by field data from equipment manufacturers.