NXP Semiconductors 74ABT2245D,118

Overview

74ABT2245D,118 from NXP Semiconductors (formerly Philips) is an octal bidirectional 3-State transceiver with integrated 30 Ω series output termination, non-inverting logic, and separate direction (DIR) and output enable (OE) controls. It operates from 4.5 V to 5.5 V, delivers ±32 mA sink/source drive, and achieves 3.9 ns typical propagation delay (An↔Bn) at 5 V with 50 pF load - optimized for high-speed bus interface in memory address and clock distribution systems.

For engineers reviewing the 74ABT2245D,118 datasheet, 74ABT2245D,118 pinout, 74ABT2245D,118 application, or 74ABT2245D,118 equivalent, this device is selected for noise-sensitive 5 V TTL-compatible data paths requiring internal termination, live insertion capability, and low-impedance bidirectional buffering without external resistors.

Technical Context

The 74ABT2245D,118 implements a dual-rail BiCMOS architecture enabling simultaneous high-speed switching (tPLH/tPHL ≤ 5.4 ns max over temperature) and low static current (ICCZ = 50 µA typical at 5.5 V). Its DIR-controlled signal flow supports synchronous bidirectional data transfer between A- and B-side 8-bit buses, while OE provides global 3-State control.

All eight outputs integrate matched 30 Ω series resistance in both HIGH and LOW states - eliminating need for discrete termination and reducing reflected noise on transmission lines. Inputs are fully disabled during 3-State mode, and power-up 3-State behavior prevents bus contention at power-on.

Key Specifications

Pinout & Package

74ABT2245D,118 is housed in a 20-pin plastic SO (Small Outline) package per SOT163-1, 7.5 mm body width, surface-mount compatible with JEDEC MS-013 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74ABT2245D,118, the 74ABT245-1 offers identical performance in a functionally interchangeable form, while SN74ABT245N trades SMT compatibility and live-insertion support for through-hole convenience - making the 74ABT2245D,118 optimal for space-constrained, high-reliability industrial PCBs.

Availability

74ABT2245D,118 is available at Aetrix Electronics and suitable for memory address buffering, backplane data interfacing, programmable logic I/O expansion, and legacy peripheral bridging requiring stable component supply across extended product lifecycles.

Supply support for 74ABT2245D,118 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic IC development.

The 74ABT2245D,118 belongs to NXP's ABT-series advanced BiCMOS logic family, engineered for high-speed, low-noise 5 V bus interfacing in mission-critical industrial control and computing infrastructure.

FAQ

What is the maximum operating frequency supported by the 74ABT2245D,118?

The 74ABT2245D,118 supports reliable operation up to approximately 180 MHz in typical 50 pF load conditions, based on its 5.4 ns maximum propagation delay (tPLH/tPHL) and 7.8 ns maximum 3-State disable time (tPLZ/tPHZ). Actual system frequency depends on board layout, termination, and fanout - but the 74ABT2245D,118 is routinely deployed in 20–50 MHz bus systems with margin.

Does the 74ABT2245D,118 require external pull-up or pull-down resistors on DIR or OE pins?

No, the 74ABT2245D,118 does not require external biasing on DIR or OE - both inputs have CMOS-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and leakage < ±1.0 µA, allowing direct connection to microcontroller GPIOs or logic gates. The 74ABT2245D,118's internal structure ensures clean switching without floating-input risk.

Can the 74ABT2245D,118 be used in mixed-voltage systems (e.g., 3.3 V logic driving its inputs)?

The 74ABT2245D,118 accepts 3.3 V logic inputs reliably: its VIH threshold is 2.0 V minimum, and inputs tolerate up to 7.0 V. However, outputs swing to 5 V levels, so interfacing with 3.3 V receivers requires level-shifting or clamping. The 74ABT2245D,118 itself must be powered at 4.5–5.5 V to guarantee specified drive strength and timing.

How does the integrated 30 Ω series termination in the 74ABT2245D,118 affect signal rise/fall times?

The 30 Ω series resistor in the 74ABT2245D,118 dampens overshoot and ringing on PCB traces by matching typical FR-4 microstrip impedances (45–65 Ω), slightly increasing edge transition time (tR/tF) by ~0.3–0.5 ns versus an unterminated driver - but this trade-off eliminates post-layout signal integrity fixes and improves eye diagram opening in multi-drop bus configurations.

Is the 74ABT2245D,118 pin-compatible with standard 74-series transceivers like the 74LS245?

No - while functionally similar, the 74ABT2245D,118 uses a different pinout than 74LS245: DIR is on pin 1 (vs 19 on LS245), and B-side pins are reversed (B7–B0 on pins 11–18 vs B0–B7 on pins 2–9). Direct substitution would cause bus reversal and logic failure. The 74ABT2245D,118 is pin-compatible only with 74ABT245-1 and other ABT-family variants sharing SOT163-1 mapping.