Texas Instruments CD54HC151F3A

Overview

CD54HC151F3A from Texas Instruments is a high-speed CMOS 8-input digital multiplexer with complementary non-inverting (Y) and inverting (W) outputs, three binary select inputs (A/B/C), and active-low enable (G). It operates from 2 V to 6 V, supports -55°C to +125°C temperature range, and delivers propagation delays as low as 14 ns (typical at VCC = 4.5 V, CL = 15 pF), enabling precise signal routing in military-grade timing and data selection circuits.

For engineers reviewing the CD54HC151F3A datasheet, CD54HC151F3A pinout, CD54HC151F3A application, or CD54HC151F3A equivalent, this page provides verified functional mode tables, real-world switching characteristics across temperature extremes, package-specific thermal resistance (RθJA = 67 °C/W for CDIP), and validated alternatives for high-reliability analog/digital interface designs.

Technical Context

The CD54HC151F3A implements a single 8:1 multiplexer architecture using standard CMOS logic, where binary inputs A, B, and C decode one of eight data channels (D0–D7) to dual outputs Y (non-inverting) and W (inverting). Its enable input G is active-low and overrides all select logic when asserted.

All inputs are buffered, providing 10 LSTTL load fanout capability and balanced propagation delay (tpd ≤ 43 ns max at VCC = 4.5 V, -55°C to +125°C) with transition times (tt ≤ 22 ns) tightly matched between Y and W paths - critical for synchronous data gating and phase-sensitive routing.

Key Specifications

Pinout & Package

CD54HC151F3A uses a 16-pin Ceramic Dual In-line Package (CDIP) with 24.38 mm × 6.92 mm body size and through-hole mounting. The package is hermetically sealed, rated for extended temperature operation, and features tin-lead (SNPB) lead finish with no MSL restriction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-input multiplexer applications.

Compared with CD74HC151E and CD54HCT151F3A, CD54HC151F3A uniquely combines hermetic CDIP packaging, 2–6 V operation, and full military temperature qualification - making it the sole choice for space-constrained, high-reliability embedded systems requiring both voltage flexibility and environmental robustness.

Availability

CD54HC151F3A is available at Aetrix Electronics and suitable for avionics signal routing, military data acquisition, secure communication modules, and test equipment channel switching requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD54HC151F3A 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability logic solutions with over 50 years of aerospace and defense component heritage.

CD54HC151F3A belongs to TI's military-grade HC logic family, designed specifically for high-integrity digital signal routing in safety-critical platforms where extended temperature operation, hermetic packaging, and QML certification are mandatory.

FAQ

What is the maximum operating frequency supported by CD54HC151F3A?

The CD54HC151F3A does not specify a maximum clock frequency, but its propagation delay (tpd ≤ 43 ns max over -55°C to +125°C) supports reliable operation up to approximately 10–15 MHz in typical data routing applications. For precise timing, designers must verify setup/hold margins against the slowest switching path (e.g., Enable-to-Y at 36 ns max) and account for board-level capacitance and drive strength.

Does CD54HC151F3A require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs on CD54HC151F3A must be tied to VCC or GND per TI layout guidelines. Floating inputs can cause undefined output states, increased ICC, and potential latch-up. For example, unused select lines (A/B/C) should be grounded to force default channel selection, while unused data inputs (D0–D7) may be tied to GND unless actively driven.

Can CD54HC151F3A operate with a 3.3 V supply?

Yes - CD54HC151F3A supports 2 V to 6 V operation, so 3.3 V is fully within specification. At VCC = 3.3 V, VOH ≥ 3.15 V and VOL ≤ 0.33 V (per electrical characteristics table), ensuring compatibility with 3.3 V LVTTL and LVCMOS logic families without level shifting.

How does the enable input (G) affect output states on CD54HC151F3A?

When G is logic high, both Y and W outputs enter high-impedance (Hi-Z) state regardless of select or data inputs - effectively disconnecting the device from downstream circuitry. When G is logic low, Y and W reflect the selected Dn input in true and complemented form respectively. This enables bus sharing and power-aware signal gating.

Is CD54HC151F3A pin-compatible with CD74HC151M?

No - CD54HC151F3A uses a 16-pin CDIP (J) package with 24.38 mm × 6.92 mm dimensions, while CD74HC151M uses a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm. Though both share identical pin functions and numbering, their physical footprints, thermal profiles (RθJA = 67 vs. 73 °C/W), and mounting methods (through-hole vs. surface-mount) are incompatible without PCB redesign.