Nexperia USA Inc. 74HC126D,652

Overview

74HC126D,652 from Nexperia is a quad 3-state buffer/line driver in SO14 (SOT108-1) package, operating from 2.0 V to 6.0 V supply, with CMOS-level inputs, ±35 mA output drive, and propagation delay as low as 9 ns at VCC = 6.0 V. It enables bidirectional bus isolation in digital logic systems such as microcontroller peripheral interfaces and memory address/data latching.

For engineers reviewing the 74HC126D,652 datasheet, 74HC126D,652 pinout, 74HC126D,652 application, or 74HC126D,652 equivalent, key selection criteria include 3-state enable timing (t_en/t_dis ≤ 32 ns), input clamp diode support for overvoltage-tolerant interfacing, and guaranteed operation across -40 °C to +125 °C industrial temperature range.

Technical Context

This device implements four independent non-inverting buffers, each with dedicated active-HIGH output enable (nOE) controlling high-impedance OFF-state. The internal structure includes input clamp diodes enabling current-limiting resistor-based interfacing to voltages exceeding V_CC, and CMOS transistor topology ensuring low static power consumption (<160 μA ICC at 6.0 V).

Logic behavior follows standard truth table: when nOE = HIGH, output Y mirrors input A; when nOE = LOW, output enters high-impedance state (Z). Propagation delay (t_pd) and transition time (t_t) are characterized per channel under defined load (CL = 50 pF) and supply conditions, with worst-case t_pd = 30 ns at VCC = 4.5 V and -40 °C to +125 °C.

Key Specifications

Pinout & Package

74HC126D,652 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width, optimized for surface-mount assembly and thermal dissipation up to 500 mW at Tamb ≤ 100 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC126D,652, the 74HCT126D,653 offers TTL input compatibility at the cost of higher static current, while SN74LVC126APWR delivers superior speed and density in 3.3 V domains but lacks 5 V tolerance and industrial temperature support.

Availability

74HC126D,652 is available at Aetrix Electronics and suitable for microcontroller bus expansion, memory address latching, and industrial I/O module backplane applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC126D,652 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, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The 74HC126 belongs to Nexperia's 74HC logic family-designed for general-purpose digital interfacing with wide voltage operation, robust ESD performance, and full industrial temperature qualification.

FAQ

Can 74HC126D,652 drive a 50 pF load at 10 MHz without signal degradation?

Yes. With typical propagation delay of 11 ns at VCC = 4.5 V and CL = 50 pF, and transition time of 5 ns, the device maintains clean edges and meets setup/hold timing for 10 MHz synchronous interfaces. Its ±35 mA output drive ensures adequate slew rate (dV/dt > 0.7 V/ns) to overcome capacitive loading without overshoot.

What is the maximum allowable input voltage if VCC = 3.3 V?

Per Absolute Maximum Ratings, input voltage may reach VCC + 0.5 V = 3.8 V continuously. The integrated clamp diodes allow safe operation up to this level when used with appropriate series current-limiting resistors (e.g., 1 kΩ limits IIK to <5 mA at 5 V input), preventing damage from overvoltage transients.

Is 74HC126D,652 pin-compatible with 74HC125?

No. While both are quad 3-state buffers, 74HC125 uses inverting outputs and different pin mapping: its OE inputs are on pins 3, 6, 8, and 11, whereas 74HC126 places OEs on pins 1, 4, 10, and 13. Swapping them causes functional failure and potential bus contention due to inverted logic polarity.

Does this device support hot-swap insertion into a live 5 V bus?

No. Although it features input clamp diodes and high-impedance outputs, 74HC126D,652 lacks explicit hot-swap protection circuitry (e.g., slew-rate limited I/O, undervoltage lockout). Insertion while powered risks supply rail disturbance, ground bounce, or latch-up if VCC ramps before GND stabilizes - use dedicated hot-swap controllers for such applications.