Nexperia USA Inc. 74AHCT125PW,112

Overview

74AHCT125PW,112 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs and CMOS outputs, operating from 4.5 V to 5.5 V supply. It features four independent channels, each with active-low output enable (nOE), overvoltage-tolerant inputs up to 5.5 V, and propagation delay as low as 3.0 ns at VCC = 5.0 V with 15 pF load - enabling reliable signal buffering in mixed-voltage digital interfaces such as microcontroller I/O expansion and bus isolation.

For engineers reviewing the 74AHCT125PW,112 datasheet, 74AHCT125PW,112 pinout, 74AHCT125PW,112 application, or 74AHCT125PW,112 equivalent, this device is selected for level translation between 3.3 V logic domains and 5 V systems, high-noise industrial control backplanes, and low-power data path gating where precise timing, latch-up immunity (>100 mA), and ESD robustness (HBM >2000 V) are required.

Technical Context

The 74AHCT125PW,112 implements four identical non-inverting buffers, each controlled by a dedicated active-low output enable input (1OE–4OE). Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.5 V) ensure compatibility with legacy 5 V logic families while driving CMOS loads with rail-to-rail output swing.

Each channel supports high-impedance tri-state operation during disable, with OFF-state leakage below ±0.25 μA at VCC = 5.5 V. Input Schmitt-trigger action is not present - inputs follow standard TTL hysteresis per JEDEC JESD8-5, and all pins tolerate up to 5.5 V regardless of VCC, enabling safe interfacing across voltage domains.

Key Specifications

Pinout & Package

TSSOP14 plastic thin shrink small outline package (SOT402-1); 14-lead, body width 4.4 mm, 0.65 mm pitch, exposed pad optional (non-functional).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT125D,112, the 74AHCT125PW,112 offers 30 % smaller PCB area and improved thermal performance in surface-mount assemblies; versus SN74AHCT125PWR, it provides superior high-temperature operation and tighter static current control critical for battery-powered diagnostics.

Availability

74AHCT125PW,112 is available at Aetrix Electronics and suitable for industrial automation, automotive diagnostics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT125PW,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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHCT series belongs to Nexperia's advanced logic portfolio, engineered specifically for robust, low-power, mixed-voltage digital interfacing in harsh environments - emphasizing reliability, ESD resilience, and wide operating margins.

FAQ

Can 74AHCT125PW,112 operate with a 3.3 V supply?

No. The 74AHCT125PW,112 is TTL-input compatible and requires VCC ≥ 4.5 V for guaranteed VIH/VIL thresholds and output drive strength. At 3.3 V, inputs may not register HIGH reliably, and VOH drops below 2.4 V - violating TTL logic levels. Use 74AHC125PW for 2.0–5.5 V operation with CMOS inputs instead.

What is the maximum capacitive load this device can drive while maintaining timing specs?

The datasheet guarantees tpd ≤ 7.5 ns and tdis ≤ 11.0 ns up to CL = 50 pF at VCC = 5.0 V. Driving >50 pF increases propagation delay nonlinearly and may cause overshoot/ringing; for loads >75 pF, add series termination (22–33 Ω) near the driver output to maintain signal integrity.

Is the exposed pad on the TSSOP14 package electrically connected?

No. The exposed thermal pad in SOT402-1 (TSSOP14) is not internally connected to any die node. Nexperia documentation states it has no electrical or mechanical requirement to be soldered. If soldered, it must remain floating or be tied to GND - never to VCC or signal nets.

How does the 74AHCT125PW,112 handle input voltages exceeding VCC?

Inputs tolerate −0.5 V to +5.5 V regardless of VCC, enabled by integrated clamping diodes to VCC and GND. When VI > VCC, current flows into VCC rail; design must ensure the supply can sink this current (max ±20 mA per pin) without violating VCC regulation or triggering overvoltage protection.