NXP Semiconductors 74HC258DB,112

Overview

74HC258DB,112 from NXP Semiconductors is a quad 2-input inverting multiplexer with 3-state outputs, designed for bus-oriented data routing in digital systems. It features common select (S) and output enable (OE) controls, operates from 2.0 V to 6.0 V, supports −40 °C to +125 °C ambient range, and delivers propagation delays as low as 9 ns at VCC = 6.0 V - enabling reliable signal selection in industrial control logic and memory address decoding.

For engineers reviewing the 74HC258DB,112 datasheet, 74HC258DB,112 pinout, 74HC258DB,112 application, or 74HC258DB,112 equivalent, key selection criteria include its inverting data path, 3-state bus interface capability, SSOP16 package footprint, JEDEC 7A compliance, and guaranteed operation across extended temperature ranges without derating.

Technical Context

The 74HC258DB,112 implements four independent 2:1 multiplexers sharing one select input (S) and one active-low output enable (OE), with all outputs inverted relative to selected inputs. Its logic equations define each output as Yn = OE × (Sn × In0 + Sn × In1), where inversion occurs at both data path and output stage.

It uses high-speed Si-gate CMOS technology, achieving pin compatibility with LSTTL while delivering significantly lower power dissipation. The device supports direct interfacing with system buses via 3-state outputs and includes ESD protection exceeding 2000 V HBM and 200 V MM per JESD22 standards.

Key Specifications

Pinout & Package

74HC258DB,112 is housed in a plastic shrink small outline package (SSOP16) with 16 leads and 5.3 mm body width (SOT338-1), optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC258DB,112, the 74HC257D,653 offers identical functionality minus inversion - simplifying downstream logic but requiring redesign if inversion is leveraged for timing or signal conditioning. The SN74LV4052APWR trades 3-state digital control and inverting capability for analog flexibility and lower on-resistance, making it unsuitable as a drop-in replacement in pure digital bus applications.

Availability

74HC258DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O multiplexing, memory address selection, test equipment signal routing, and digital audio data switching requiring stable component supply across extended temperature ranges.

Supply support for 74HC258DB,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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74HC258DB,112 belongs to NXP's 74HC logic family, engineered for high-speed, low-power digital signal routing in noise-immune industrial and automotive environments where reliability across wide temperature ranges is critical.

FAQ

What is the function of the OE pin on the 74HC258DB,112?

The OE (output enable) pin on the 74HC258DB,112 is an active-low control that places all four outputs (1Y–4Y) into a high-impedance OFF-state when driven HIGH. When OE is LOW, outputs become active and reflect the inverted, selected input per the S signal state. This enables bus-sharing capability in multi-device systems, preventing signal contention during data transfer cycles. The 74HC258DB,112 requires OE to be asserted (LOW) for functional operation.

Does the 74HC258DB,112 support 3.3 V logic levels?

Yes, the 74HC258DB,112 supports 3.3 V operation within its specified supply range of 2.0 V to 6.0 V. At VCC = 3.3 V, VIH is guaranteed ≥ 2.31 V and VIL ≤ 1.09 V, providing adequate noise margins for standard 3.3 V CMOS interfaces. Static and dynamic parameters including propagation delay (tpd ≈ 14 ns typical) and output drive (±6 mA) remain fully characterized across this voltage, confirming reliable interoperability with 3.3 V microcontrollers and FPGAs. The 74HC258DB,112 maintains full functionality at 3.3 V without derating.

How does the inverting output behavior affect system design with the 74HC258DB,112?

The 74HC258DB,112 inverts all selected data at the output stage - meaning 1Y = NOT(1I0) when S = LOW, and 1Y = NOT(1I1) when S = HIGH. This requires upstream or downstream logic to account for polarity reversal, especially in feedback loops or synchronous latch interfaces. However, it also enables direct implementation of complemented bus arbitration or active-low enable schemes without extra inverters. System timing analysis must include the fixed inversion delay, which is included in the published tpd specification. The 74HC258DB,112's consistent inversion simplifies designs requiring logical negation of routed signals.

Can the 74HC258DB,112 replace the 74HC257 in an existing design?

The 74HC258DB,112 is functionally identical to the 74HC257 except for output polarity: the 74HC258DB,112 provides inverted outputs while the 74HC257 provides non-inverted outputs. Pinout, supply range, timing, and 3-state behavior are fully compatible. Therefore, the 74HC258DB,112 can replace the 74HC257 only if the system design accommodates or requires inversion - otherwise, adding an external inverter or modifying firmware logic is necessary. No PCB changes are needed for physical fit, but signal polarity verification is mandatory before substitution. The 74HC258DB,112 is not a drop-in replacement unless inversion is intentional.

What is the maximum capacitive load the 74HC258DB,112 can drive reliably?

The 74HC258DB,112 is characterized for dynamic performance with load capacitances up to 50 pF (per Table 9 test conditions), and propagation delay is specified at CL = 15 pF. While the outputs can physically drive higher capacitance, timing margins degrade linearly beyond 50 pF due to increased RC time constant. For reliable operation at rated speed, total load (including trace, probe, and input capacitance of downstream devices) should not exceed 50 pF. If larger loads are unavoidable, derating the maximum operating frequency or adding a buffer stage is recommended. The 74HC258DB,112's 55 pF CPD value reflects internal switching capacitance, not drive capability limit.