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74HC245 Octal Bus Transceiver — SOP-20 Wide Body, 3-State, 2–6V (5-Pack)
74HC245 Octal Bus Transceiver SOP-20 Wide Body, 3-State, 2–6V (5-Pack)
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74HC245 — Octal Bus Transceiver, SOP-20 Wide Body, 3-State Outputs
The 74HC245 (also marked ICN74HC245 or SM74HC245D) is a high-speed CMOS octal (8-bit) bidirectional bus transceiver with 3-state outputs in a SOP-20 wide-body (7.2mm) SMD package. It provides non-inverting data transfer in either direction (A→B or B→A) controlled by the direction pin (DIR), and can be disabled to high-impedance state via the output enable pin (/OE). Operating from 2V to 6V, it is compatible with both 3.3V and 5V logic systems. Each pack contains 5 pieces.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | 74HC245 (ICN74HC245 / SM74HC245D) |
| Package | SOP-20 Wide Body (7.2mm, 1.27mm pitch) |
| Function | Octal Bidirectional Bus Transceiver |
| Data Width | 8-bit (octal) |
| Output Type | 3-State (High-Z when /OE = HIGH) |
| Direction Control | DIR pin (HIGH = A→B, LOW = B→A) |
| Supply Voltage (VCC) | 2V – 6V |
| Output Current (IOH) | -7.8mA (source) |
| Output Current (IOL) | 7.8mA (sink) |
| Propagation Delay | ~7ns @ 5V |
| Logic Family | HC CMOS |
| Operating Temperature | -40°C to +125°C |
| Quantity | 5 pieces per pack |
Why Choose 74HC245?
- 8-bit bidirectional — transfer full byte in either direction with single DIR pin
- 3-state outputs — multiple transceivers can share the same bus without conflict
- 7.8mA output drive — directly drive LEDs, logic inputs, and bus lines
- 2–6V supply — compatible with 3.3V and 5V systems
- ~7ns propagation delay — suitable for high-speed data bus applications
- 5-pack value — enough for multi-byte bus or multiple projects
Typical Applications
- Data bus buffering — isolate and buffer microcontroller data buses
- Logic level shifting — interface 3.3V microcontrollers with 5V peripherals (with appropriate VCC)
- LED matrix driving — sink current for 8-LED rows in matrix displays
- Memory interface — buffer address and data buses for SRAM and Flash memory
- FPGA I/O expansion — extend FPGA I/O with buffered 3-state outputs
- Bus isolation — isolate subsystems on shared data bus with /OE control
Pin Description
| Pin | Name | Function |
|---|---|---|
| 1 | /OE | Output Enable (active LOW — HIGH = high-Z) |
| 2 | DIR | Direction (HIGH = A→B, LOW = B→A) |
| 3–10 | A1–A8 | A-side data bus |
| 11–18 | B1–B8 | B-side data bus |
| 10 | GND | Ground |
| 20 | VCC | Supply voltage |
FAQ
Q: Can 74HC245 be used for 3.3V to 5V level shifting?
A: Partially. Power the 74HC245 at 5V and connect the A-side to 5V logic and B-side to 3.3V logic. The 3.3V inputs will be recognized as HIGH (VIH min = 3.5V at 5V VCC). For reliable bidirectional level shifting, use a dedicated level shifter (e.g., TXB0108).
Q: What is the difference between 74HC245 and 74HCT245?
A: 74HC245 has CMOS-level inputs (VIH = 0.7×VCC). 74HCT245 has TTL-compatible inputs (VIH = 2.0V fixed), making it better for interfacing with 5V TTL outputs when powered at 5V.
Q: Is ICN74HC245 the same as 74HC245?
A: Yes. ICN74HC245 and SM74HC245D are manufacturer-specific markings for the standard 74HC245 function. They are pin-compatible and electrically equivalent.
Package Contents
- 5× 74HC245 Octal Bus Transceiver SOP-20 (new, original)
