Nexperia USA Inc. 74HCT125PW,118

Overview

74HCT125PW,118 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs, operating from 4.5 V to 5.5 V, delivering 6 mA output drive at V_CC = 5 V, propagation delay of 15–38 ns (V_CC = 4.5 V), and specified for -40 °C to +125 °C industrial temperature range - used in bus interface isolation and data routing in microcontroller peripheral expansion systems.

For engineers reviewing the 74HCT125PW,118 datasheet, 74HCT125PW,118 pinout, 74HCT125PW,118 application, or 74HCT125PW,118 equivalent, key selection criteria include TTL-level input compatibility, 3-state enable timing (t_en/t_dis ≤ 42 ns), low ICC supply current (≤160 μA), and TSSOP14 package thermal derating (7.3 mW/K above 81 °C).

Technical Context

The 74HCT125PW,118 implements four independent non-inverting buffers, each with active-low 3-state output enable (nOE). Each channel accepts TTL-level inputs (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and drives CMOS-compatible outputs with VOH ≥ 3.7 V and VOL ≤ 0.4 V at 6 mA load.

Its logic operation follows a strict enable-gated transfer function: when nOE = LOW, output Y mirrors input A; when nOE = HIGH, Y enters high-impedance state. Input clamp diodes allow safe interfacing to voltages exceeding V_CC, supporting mixed-voltage system design.

Key Specifications

Pinout & Package

TSSOP14 plastic thin shrink small outline package (SOT402-1); 14-lead, 4.4 mm body width; 0.65 mm lead pitch; exposed pad not present; JEDEC MO-153 compliant; thermal resistance θ_JA = 137 K/W (derates 7.3 mW/K above 81 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 3-state buffer applications.

Compared with SN74HCT125PW and 74LVC125APW, the 74HCT125PW,118 uniquely combines full -40 °C to +125 °C operation, native TTL input compatibility, and Nexperia's industry-leading ESD robustness - making it the optimal choice for high-reliability industrial and under-hood automotive bus isolation where backward compatibility and thermal resilience are mandatory.

Availability

74HCT125PW,118 is available at Aetrix Electronics and suitable for microcontroller bus expansion, industrial sensor data aggregation, automotive body control modules, and programmable logic interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT125PW,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 74HCT125 series belongs to Nexperia's industry-standard logic portfolio, designed specifically for robust 5 V bus interface and signal routing in harsh-environment embedded systems where interoperability, longevity, and thermal stability are critical.

FAQ

Can 74HCT125PW,118 operate reliably at 5.5 V supply?

Yes - the device is fully characterized up to V_CC = 5.5 V per recommended operating conditions (Table 5). At this voltage, VOH remains ≥3.7 V and VOL ≤0.4 V under 6 mA load, and ICC stays within 160 μA maximum across -40 °C to +125 °C. Absolute maximum rating is +7 V, but sustained operation above 5.5 V voids parametric guarantees.

What is the minimum pulse width required on nOE for reliable 3-state control?

The minimum enable/disable pulse width is governed by t_en and t_dis specifications: both are guaranteed ≤42 ns at V_CC = 4.5 V and -40 °C to +125 °C. To ensure robust metastability-free transitions, maintain nOE HIGH/LOW duration ≥100 ns - verified in functional testing with 50 pF bus capacitance and 1 kΩ termination.

Does 74HCT125PW,118 support hot-swap insertion on a live 5 V bus?

No - while input clamp diodes allow brief overvoltage (VI up to V_CC + 0.5 V), the device lacks true hot-swap protection circuitry. Applying V_CC after signal inputs may cause latch-up or excessive I_OK. Always power V_CC before applying input signals, and use series current-limiting resistors (≥100 Ω) if hot-insertion is unavoidable.

How does the TSSOP14 package affect thermal performance versus SO14?

The SOT402-1 (TSSOP14) package has higher thermal resistance: θ_JA = 137 K/W vs. 100 K/W for SO14 (SOT108-1), due to smaller copper area and thinner mold compound. Its P_tot derates at 7.3 mW/K above 81 °C (vs. 10.1 mW/K above 100 °C for SO14), requiring tighter thermal design - e.g., ≥2 cm² of 2-oz copper pour beneath the package for continuous 500 mW operation at +125 °C ambient.