Nexperia USA Inc. 74HCT280DB,118

Overview

74HCT280DB,118 from Nexperia is a 9-bit TTL-compatible odd/even parity generator/checker IC in SSOP14 package, delivering dual HIGH-active outputs (PE and PO), supporting cascaded expansion up to 17-bit systems, and operating across -40 °C to +125 °C with 4.5 V–5.5 V supply voltage - used in industrial serial communication integrity verification.

For engineers reviewing the 74HCT280DB,118 datasheet, 74HCT280DB,118 pinout, 74HCT280DB,118 application, or 74HCT280DB,118 equivalent, key selection criteria include TTL-level input compatibility, propagation delay under 63 ns at 4.5 V, dual-parity output logic behavior, and SSOP14 thermal derating (7.3 mW/K above 81 °C).

Technical Context

This device implements combinational logic for real-time parity evaluation across nine independent inputs (I0–I8), where PE asserts HIGH when an even count of inputs are HIGH, and PO asserts HIGH for odd counts - enabling simultaneous generation and checking within a single cycle. Its TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V) ensure direct interfacing with legacy 5 V logic families without level shifting.

Cascading is supported via parallel connection of PE outputs to downstream data inputs, allowing scalable word-length extension while preserving timing integrity; internal clamp diodes permit safe interface to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HCT280DB,118 is housed in SSOP14 (SOT337-1) package: plastic thin shrink small outline, 14 leads, body width 5.3 mm, pitch 0.65 mm, recommended reflow profile per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit parity generator/checker applications.

Compared with 74HCT280DB,118, the PW variant offers superior thermal efficiency in compact layouts, while the N variant provides mechanical robustness and ease of hand-soldering - neither alters functional behavior or timing, making them drop-in replacements in their respective form factors.

Availability

74HCT280DB,118 is available at Aetrix Electronics and suitable for industrial serial data integrity, legacy bus parity checking, and multi-channel sensor aggregation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT280DB,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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions - serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The 74HCT280 belongs to Nexperia's 74HCT logic family, designed specifically for TTL-to-CMOS interfacing in noise-sensitive industrial control and communication infrastructure applications.

FAQ

What is the maximum clock rate supported by 74HCT280DB,118?

The device has no internal clock; it operates asynchronously. Maximum usable data rate depends on propagation delay: at VCC = 4.5 V and CL = 50 pF, tpd ≤ 63 ns (In to PO), supporting reliable operation in systems with data valid windows ≥ 70 ns - typical for 10 MHz parallel buses or 1 Mbps UART with hardware parity.

Can 74HCT280DB,118 be used with 3.3 V logic systems?

No - the 74HCT280DB,118 is specified only for 4.5–5.5 V operation and requires TTL-level inputs (VIH ≥ 2.0 V). Driving it from 3.3 V logic may cause unreliable switching; use 74HC280 or level translators instead for 3.3 V systems.

How does cascading work for larger word sizes?

Cascading uses the PE output of one device as a data input to another: e.g., first 74HCT280 handles I0–I8, its PE feeds I0 of second device, whose remaining eight inputs accept next eight bits - final PE/PO reflect parity of all 17 bits, with propagation delay accumulating linearly across stages.

Is 74HCT280DB,118 automotive-qualified?

No - this part is not AEC-Q100 qualified. It is rated for -40 °C to +125 °C industrial operation but lacks automotive-specific stress testing, failure analysis, and PPAP documentation. For automotive applications, consult Nexperia's automotive-grade 74AHC280 variants.