Nexperia USA Inc. 74AHCT32D,118

Overview

74AHCT32D,118 from Nexperia is a quad 2-input OR gate IC with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), 14-pin SO14 package (SOT108-1), propagation delay of 3.1–9.0 ns (VCC = 4.5–5.5 V, CL = 15–50 pF), and operation over -40 °C to +125 °C. It serves as a level-translating logic combiner in mixed-voltage digital control subsystems such as industrial PLC I/O modules.

For engineers reviewing the 74AHCT32D,118 datasheet, 74AHCT32D,118 pinout, 74AHCT32D,118 application, or 74AHCT32D,118 equivalent, this page delivers verified functional identity, SO14 pin mapping, TTL-level interface behavior, propagation timing under load, and validated alternatives for voltage-tolerant OR logic replacement.

Technical Context

The 74AHCT32D,118 implements four independent 2-input OR gates with Schmitt-trigger inputs for noise immunity and overvoltage-tolerant inputs rated to 5.5 V - enabling safe interfacing between 3.3 V and 5 V domains. Each gate exhibits matched tPLH/tPHL propagation delays and operates with rail-to-rail output swing (VOH ≥ 3.7 V, VOL ≤ 0.55 V at IO = ±8 mA).

Its static input thresholds are fixed to TTL levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) across the full 4.5–5.5 V supply range, while dynamic performance is characterized at CL = 15 pF and CL = 50 pF loads with defined test waveforms per IEC 62433. The device supports hot-swap tolerant operation due to input clamping and ESD robustness (HBM > 2000 V, CDM > 1000 V).

Key Specifications

Pinout & Package

74AHCT32D,118 uses the SO14 plastic small outline package (SOT108-1), 14-lead, 3.9 mm body width, with gull-wing leads and pin 1 index marked by a bevelled corner or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input OR gate applications.

Compared with 74AHCT32D,118, the TSSOP variant offers superior thermal and spatial efficiency, while the TI SN74AHCT32DR adds AEC-Q100 traceability - neither matches Nexperia's specified 125 °C dynamic timing performance with Schmitt inputs unless explicitly re-characterized.

Availability

74AHCT32D,118 is available at Aetrix Electronics and suitable for industrial control systems, test equipment signal routing, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT32D,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 essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions optimized for reliability and energy efficiency.

The 74AHCT32D,118 belongs to Nexperia's advanced logic family designed for robust, mixed-voltage digital interfacing in industrial, automotive, and computing applications where TTL compatibility and wide temperature operation are mandatory.

FAQ

Can 74AHCT32D,118 operate with a 3.3 V supply?

No. The 74AHCT32D,118 is specifically designed for TTL-level inputs and requires VCC = 4.5–5.5 V per its recommended operating conditions. At 3.3 V, VIH (2.0 V min) is met, but VOH and VOL are not guaranteed, and propagation delay increases significantly beyond specification. Use 74AHC32D,118 instead for 3.3 V operation.

What is the maximum capacitive load the outputs can drive reliably?

The outputs are characterized up to 50 pF load capacitance with guaranteed timing (tpd ≤ 9.0 ns at VCC = 4.5–5.5 V). Driving >50 pF increases propagation delay nonlinearly and may cause ringing or undershoot; for >50 pF, add series termination or buffer stages. Output current remains within ±8 mA limits up to CL = 100 pF, but timing degrades beyond spec.

Does 74AHCT32D,118 support hot insertion?

Yes - its overvoltage-tolerant inputs (rated to 5.5 V independent of VCC) and input clamping current limit (-20 mA) allow safe connection to live backplanes or powered buses during insertion. However, VCC must be applied before or simultaneously with input signals to avoid latch-up risk per JESD78 Class II Level A compliance.

How does the Schmitt-trigger input improve noise immunity?

The Schmitt action provides ~0.5 V hysteresis between VIH and VIL thresholds, meaning an input must fall below ~0.3 V to switch LOW after being HIGH, and rise above ~0.8 V to switch HIGH after being LOW. This prevents oscillation on slow or noisy edges - critical for mechanical switch debouncing or long PCB trace routing without added RC filtering.