Renesas 74FCT245ATPGG

Overview

74FCT245ATPGG from Renesas Electronics (formerly IDT) is a fast CMOS octal bidirectional transceiver in 20-pin TSSOP package, operating at 5.0V ±5%, supporting industrial temperature range (–40°C to +85°C), with 15mA high-drive output sourcing and 64mA sinking capability, used for asynchronous bus-level data translation between A and B ports in embedded control systems.

For engineers reviewing the 74FCT245ATPGG datasheet, 74FCT245ATPGG pinout, 74FCT245ATPGG application, or 74FCT245ATPGG equivalent, key selection considerations include direction control via active-high T/R input, active-low OE for 3-state disable, TTL-compatible I/O levels, and high-speed propagation delay (max 4.1ns A↔B) under industrial conditions.

Technical Context

The 74FCT245ATPGG implements an asynchronous bidirectional data path controlled by two independent logic inputs: OE (active-low output enable) places both A and B ports in high-impedance state when asserted, while T/R (transmit/receive) determines flow direction - high enables A→B, low enables B→A. It uses dual-metal CMOS process for TTL-compatible voltage thresholds and low leakage.

Designed for bus isolation and level-shifting in mixed-voltage systems, it features true TTL input thresholds (VIH = 2.0V min, VIL = 0.8V max), guaranteed output drive (VOH ≥ 2.4V at –15mA, VOL ≤ 0.55V at 64mA), and meets JEDEC Std-18. Its 3-state outputs support live insertion and hot-swap compatibility in backplane and modular subsystems.

Key Specifications

Pinout & Package

74FCT245ATPGG is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP-20, suffix PGG), with 0.65mm lead pitch, exposed pad optional, and JEDEC MO-153 compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT245ATPWR and 74LCX245MTCX, the 74FCT245ATPGG uniquely delivers full 5V TTL compatibility, industrial temperature operation, and MIL-STD-883 Class B screening - making it the sole choice for legacy 5V backplane upgrades and defense-qualified subsystems requiring proven reliability.

Availability

74FCT245ATPGG is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, telecom line card data muxing, and test equipment digital pattern generation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74FCT245ATPGG 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The 74FCT245ATPGG belongs to Renesas' legacy IDT fast CMOS logic family, designed specifically for robust, high-speed, 5V bus interfacing in mission-critical industrial and defense systems where TTL compatibility and temperature resilience are mandatory.

FAQ

What is the maximum operating frequency supported by the 74FCT245ATPGG?

The 74FCT245ATPGG does not specify a clock frequency since it is an asynchronous transceiver. Its usable data rate depends on propagation delay (max 4.1ns) and system timing margins. In practice, it reliably supports bus toggle rates exceeding 200MHz in point-to-point configurations with proper termination and layout. The 74FCT245ATPGG is not intended for synchronous clock-domain bridging but for level-consistent, direction-controlled data transfer between independent buses.

Does the 74FCT245ATPGG support live insertion in powered backplanes?

Yes, the 74FCT245ATPGG supports live insertion due to its power-off disable feature: when VCC = 0V, all outputs remain in high-impedance state regardless of OE or T/R inputs. This prevents bus contention during hot-swap events in modular systems like industrial PLCs or telecom line cards. The 74FCT245ATPGG meets this requirement per design, verified in JEDEC Std-18 and MIL-STD-883 Class B testing.

What are the absolute maximum ratings for input voltage on the 74FCT245ATPGG?

The 74FCT245ATPGG specifies two absolute maximum input voltage limits: for inputs and VCC terminals, voltage must stay within –0.5V to +7.0V; for output and I/O terminals (A0–A7, B0–B7), the limit is –0.5V to VCC + 0.5V. Exceeding these may cause permanent damage. These ratings apply to the 74FCT245ATPGG across its full industrial temperature range and are validated per JEDEC JESD78.

Is the 74FCT245ATPGG pin-compatible with the 74FCT245CTPGG?

Yes, the 74FCT245ATPGG and 74FCT245CTPGG share identical pinout, package (TSSOP-20), and DC/AC electrical specifications except for propagation delay and output enable/disable timing. The 'C' grade offers tighter timing (tPLH max 4.1ns same as 'A', but tPZH/tPHZ slightly faster), while both operate over the same industrial temperature range. The 74FCT245ATPGG is a direct drop-in replacement for the 'C' grade in most applications unless nanosecond-level timing margins are critical.

What is the input capacitance of the 74FCT245ATPGG and how does it affect high-speed routing?

The 74FCT245ATPGG has typical input capacitance of 6pF (max 10pF), measured at VIN = 0V. This low value minimizes loading on driving sources and supports clean signal integrity up to ~300MHz in well-designed PCB layouts. When routing high-speed signals, keep trace lengths short and avoid stubs - the 74FCT245ATPGG's low CIN helps preserve edge rates but does not eliminate need for impedance control on long runs (>50mm) or multi-drop buses.