Texas Instruments CD74HC245M96

Overview

CD74HC245M96 from Texas Instruments is a high-speed CMOS octal bus transceiver with non-inverting three-state outputs, designed for bidirectional asynchronous data transfer between two 8-bit buses. It features 2 V to 6 V operation, -55°C to 125°C temperature range, 19 ns typical propagation delay at VCC = 6 V, and ±25 mA output drive capability-enabling robust bus driving in industrial control backplanes.

For engineers reviewing the CD74HC245M96 datasheet, CD74HC245M96 pinout, CD74HC245M96 application, or CD74HC245M96 equivalent, key selection criteria include supply voltage flexibility (2–6 V), wide temperature tolerance, precise direction and output-enable control logic, and verified SOIC-20 packaging for surface-mount reliability in space-constrained embedded systems.

Technical Context

The CD74HC245M96 implements a dual-rail CMOS logic architecture with independent DIR (direction) and OE (output enable) control inputs governing all eight bidirectional channels. Its buffered inputs and three-state outputs support hot-swap-capable bus isolation and load sharing across mixed-voltage domains.

Propagation delay (tpd = 19 ns max at VCC = 6 V, CL = 50 pF) and transition time (tt = 15 ns max) are tightly balanced across A→B and B→A paths, ensuring deterministic timing in synchronous and asynchronous bus arbitration schemes without skew-induced metastability.

Key Specifications

Pinout & Package

CD74HC245M96 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm × 2.65 mm (max height), with gull-wing leads, NIPDAU finish, and JEDEC MS-013 compliant footprint. It is rated MSL Level-1 (unlimited floor life) and compatible with standard reflow profiles up to 260°C peak.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus transceiver applications.

Compared with SN74HC245N and CD74HCT245M96, the CD74HC245M96 offers superior thermal performance in SOIC packaging, broader supply voltage flexibility (2–6 V), and optimized suitability for automated SMT production-making it the preferred choice for new industrial and automotive designs requiring scalability and long-term availability.

Availability

CD74HC245M96 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and avionics data acquisition units requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for CD74HC245M96 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 90 years of innovation in high-reliability logic, power management, and signal chain technologies.

The CD74HC245M96 belongs to TI's legacy HC logic portfolio-engineered for robust, low-power, wide-temperature bus interfacing in mission-critical industrial, aerospace, and automotive systems where timing predictability and voltage flexibility are essential.

FAQ

What is the maximum operating frequency supported by CD74HC245M96?

The CD74HC245M96 does not specify a maximum clock frequency, as it is a combinational transceiver-not a clocked device. However, its 19 ns maximum propagation delay at VCC = 6 V and CL = 50 pF supports reliable data transfer rates exceeding 25 MHz in well-terminated bus systems. Actual usable frequency depends on bus capacitance, drive strength, and layout; for 50 pF loads, CD74HC245M96 maintains signal integrity up to ~30 MHz with proper termination and grounding.

Can CD74HC245M96 operate at 3.3 V supply voltage?

Yes, CD74HC245M96 is fully specified for 2 V to 6 V operation, including 3.3 V nominal supply. At VCC = 3.3 V, VIH = 2.31 V (min), VIL = 0.99 V (max), VOH ≥ 3.2 V (IOH = –20 µA), and VOL ≤ 0.1 V (IOL = 20 µA)-ensuring clean interfacing with 3.3 V microcontrollers and FPGAs without level translation. Propagation delay increases to ~30 ns (typical) at 3.3 V, which remains suitable for most embedded bus applications.

How does the DIR pin control data direction in CD74HC245M96?

In CD74HC245M96, the DIR pin is a static control input: when DIR = Low, data flows from B-port to A-port (B→A); when DIR = High, data flows from A-port to B-port (A→B). This direction setting applies simultaneously to all eight channels and remains active as long as OE = Low. DIR has no effect when OE = High-both A and B ports enter high-impedance state regardless of DIR logic level.

Is CD74HC245M96 pin-compatible with CD74HCT245M96?

Yes, CD74HC245M96 and CD74HCT245M96 share identical SOIC-20 (DW) package dimensions, pinout, and mechanical footprint-including identical land pattern, stencil design, and reflow profile requirements. They differ only in input threshold specifications (HC: CMOS-compatible; HCT: TTL-compatible) and supply voltage range (HC: 2–6 V; HCT: 4.5–5.5 V), making them drop-in replacements in hardware layout-but firmware or system-level voltage validation is required before substitution.

What is the recommended bypass capacitor for CD74HC245M96?

Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin of CD74HC245M96, with short, low-inductance traces to GND. For systems with high-frequency noise or multiple logic devices, paralleling a 1 µF capacitor is acceptable to improve broadband decoupling. The 0.1 µF cap targets high-frequency transients (>10 MHz), while the 1 µF cap addresses mid-band ripple (100 kHz–1 MHz); both must use X7R or better dielectric and be mounted within 3 mm of the VCC/GND pins.