NXP Semiconductors 74ABT373ADB,118

Overview

74ABT373ADB,118 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-to-Q propagation delay at 5V, and operates across –40°C to +85°C.

For engineers reviewing the 74ABT373ADB,118 datasheet, 74ABT373ADB,118 pinout, 74ABT373ADB,118 application, or 74ABT373ADB,118 equivalent, key selection criteria include latch transparency timing, 3-State bus contention control, high-current drive for legacy TTL loads, and compatibility with 20-pin SSOP packaging in industrial control and memory address/data path designs.

Technical Context

The 74ABT373ADB,118 implements a dual-control BiCMOS architecture: one section latches D0–D7 on the High-to-Low transition of E (with 0.7ns setup and 0.0ns hold time at 5V), while the other independently gates Q0–Q7 outputs via OE. This enables concurrent latch update and bus release-critical for synchronous bus arbitration.

Its 3-State outputs exhibit 7pF capacitance when disabled and support live insertion/extraction due to power-up 3-State and power-up reset behavior. The device meets JEDEC Std 17 latch-up immunity (>500mA) and MIL-STD-883 ESD ratings (2000V HBM, 200V MM), confirming robustness in noisy industrial environments.

Key Specifications

Pinout & Package

74ABT373ADB,118 is supplied in a 20-pin plastic SSOP (Shrink Small Outline Package), Type II, body width 5.3 mm (SOT339-1), with gull-wing leads and 0.65 mm pitch - optimized for high-density PCB layouts requiring thermal and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74ABT373AD,118 and SN74ABT373N, the 74ABT373ADB,118 delivers identical logic and timing performance in a compact SSOP package optimized for automated SMT assembly, thermal cycling stability, and high-density routing - making it the preferred choice for new industrial control designs requiring long-term manufacturability.

Availability

74ABT373ADB,118 is available at Aetrix Electronics and suitable for industrial control systems, legacy microprocessor bus expansion, and memory interface designs requiring stable component supply, long-lifecycle support, and guaranteed 5V TTL compatibility.

Supply support for 74ABT373ADB,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 IC development.

The 74ABT373ADB,118 belongs to NXP's ABT (Advanced BiCMOS Technology) logic family, engineered specifically for high-speed, high-drive 5V bus interface applications where legacy TTL compatibility, noise immunity, and latch reliability are critical.

FAQ

What is the maximum operating frequency supported by the 74ABT373ADB,118?

The 74ABT373ADB,118 does not specify a maximum clock frequency, as it is a level-sensitive latch-not a clocked flip-flop. Its usable data rate depends on propagation delay (3.2ns typical D-to-Q) and setup/hold timing (0.7ns setup, 0.0ns hold at 5V). In practice, the 74ABT373ADB,118 reliably supports bus cycles up to ~200 MHz when used with appropriate timing margins and load conditions.

Does the 74ABT373ADB,118 support mixed-voltage operation (e.g., 3.3V inputs with 5V supply)?

No, the 74ABT373ADB,118 is a 5V-only device. Its input voltage limits are 0V to VCC (4.5–5.5V), and VIH is specified at 2.0V minimum-compatible with 3.3V logic only if the 3.3V source has sufficient noise margin and drive strength. Direct 3.3V-to-5V interfacing requires level translation; the 74ABT373ADB,118 itself does not support dual-supply or mixed-voltage operation.

What is the purpose of the power-up 3-State feature in the 74ABT373ADB,118?

The power-up 3-State feature ensures that all Q0–Q7 outputs remain in high-impedance (Hi-Z) state until VCC stabilizes and internal biasing settles. This prevents unintended bus contention or signal corruption during power ramp-up. For the 74ABT373ADB,118, this behavior is intrinsic to its BiCMOS design and requires no external reset circuitry-enhancing system reliability at boot.

Can the 74ABT373ADB,118 be used as a registered buffer (i.e., with E held permanently High)?

Yes, the 74ABT373ADB,118 supports transparent mode when E is held High, allowing real-time pass-through of D0–D7 to Q0–Q7. In this configuration, it functions as an 8-bit non-inverting buffer with 3-State control via OE. However, note that output drive remains ±64mA/–32mA, and propagation delay increases slightly versus dedicated buffers-so verify timing against downstream load requirements for the 74ABT373ADB,118.

Is the 74ABT373ADB,118 RoHS compliant and lead-free?

Yes, the 74ABT373ADB,118 (SOT339-1 package) is RoHS compliant and lead-free, consistent with NXP's post-2006 product transition. The device uses matte tin (Sn) lead finish and meets EU Directive 2011/65/EU requirements. Full compliance documentation, including substance declarations and test reports, is available via NXP's official product page for the 74ABT373ADB,118.