NXP Semiconductors 74ABT373ADB,112

Overview

74ABT373ADB,112 from NXP Semiconductors (formerly Philips) is an octal transparent latch with 3-State outputs, designed for bus interface and data buffering in 5V TTL-compatible systems. It features active-High latch enable (E), active-Low output enable (OE), ±64mA/–32mA drive capability, 3.2ns typical D→Q propagation delay at 5V, and operates across –40°C to +85°C.

For engineers reviewing the 74ABT373ADB,112 datasheet, 74ABT373ADB,112 pinout, 74ABT373ADB,112 application, or 74ABT373ADB,112 equivalent, key selection criteria include latch transparency timing, 3-State bus contention control, high-current drive for legacy TTL loads, and SSOP-20 footprint compatibility with industrial control and memory address/data latching.

Technical Context

The 74ABT373ADB,112 implements two independent control domains: latch operation governed by active-High E input (with 1.5ns setup and 1.0ns hold time at 5V), and output gating controlled by active-Low OE. Its BiCMOS architecture delivers low static current (100µA in 3-State) while sustaining high-speed switching (≤5.1ns max D→Q delay over temperature).

Each of the eight D→Q paths functions as a transparent latch during E = High and holds data on E transition; outputs enter high-impedance state only when OE = High-regardless of E or data state-enabling safe bus sharing without contention.

Key Specifications

Pinout & Package

74ABT373ADB,112 is housed in a 20-pin plastic SSOP Type II package (SOT339-1), 5.3 mm body width, with 0.65 mm lead pitch and exposed pad not present. Pin 1 is OE (active-Low output enable); Pin 11 is E (active-High latch enable); Pins 3,4,7,8,13,14,17,18 are D0–D7; Pins 2,5,6,9,12,15,16,19 are Q0–Q7; Pin 10 is GND; Pin 20 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74ABT373ADB,112, the SO-20 alternative offers easier rework but consumes more board area, while the DIP version sacrifices density and thermal performance for mechanical robustness and manual assembly compatibility.

Availability

74ABT373ADB,112 is available at Aetrix Electronics and suitable for industrial control systems, legacy microprocessor bus interfaces, and memory subsystem design requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ABT373ADB,112 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 company formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions and high-performance logic for industrial and automotive markets.

The 74ABT373ADB,112 belongs to NXP's ABT-series advanced BiCMOS logic family, engineered specifically for high-speed, high-drive 5V bus interfacing in noise-sensitive and thermally demanding applications.

FAQ

What is the maximum operating frequency supported by the 74ABT373ADB,112?

The 74ABT373ADB,112 does not specify a maximum clock frequency, as it is a transparent latch-not a clocked register-but its 3.2ns typical D→Q propagation delay at 5V enables reliable use in systems with data valid windows ≥5ns. For 12MHz microprocessors with 41.7ns cycle time, the 74ABT373ADB,112 meets timing margins with margin. Actual usable rate depends on system-level setup/hold and bus loading.

Does the 74ABT373ADB,112 support live insertion in backplane applications?

Yes, the 74ABT373ADB,112 supports live insertion and extraction per its design: input/output structures include latch-up protection exceeding 500mA per JEDEC Std 17 and ESD hardening to 2000V HBM, enabling safe hot-swap in modular industrial backplanes without risk of damage or bus disruption.

What is the power-up behavior of the 74ABT373ADB,112 outputs?

During power-up, the 74ABT373ADB,112 outputs default to high-impedance state regardless of OE or E pin states until VCC rises above ~2.0V. This power-up 3-State feature prevents bus contention and spurious writes during supply ramp, a critical safeguard in multi-device 5V systems.

Can the 74ABT373ADB,112 drive standard TTL loads directly?

Yes, the 74ABT373ADB,112 can directly drive standard TTL loads: its –32mA high-level and +64mA low-level output currents exceed the –0.4mA / +16mA requirements of 74LS TTL, supporting up to 40 LS loads per output. This eliminates need for buffer amplifiers in legacy 5V bus designs.

Is the 74ABT373ADB,112 pin-compatible with older 74LS373 devices?

No, the 74ABT373ADB,112 is not pin-compatible with 74LS373: although both are 20-pin octal latches, the 74ABT373ADB,112 uses SSOP-20 (SOT339-1) with 0.65mm pitch, whereas 74LS373 typically uses DIP-20 or SO-20. Signal pin functions match (E, OE, Dn, Qn), but physical layout and thermal characteristics differ significantly.