Texas Instruments SN74F151BDR

Overview

SN74F151BDR from Texas Instruments is an 8-line to 1-line TTL multiplexer with active-low enable (G), dual complementary outputs (Y and W), and full binary decoding of A/B/C select lines. It operates at 4.5–5.5 V, delivers 24 mA low-level output drive, and supports propagation delays as low as 1.0 ns (tPHL, data-to-Y) under loaded conditions. It serves as a data source selector in digital control logic, bus arbitration, and Boolean function generation.

For engineers reviewing the SN74F151BDR datasheet, SN74F151BDR pinout, SN74F151BDR application, or SN74F151BDR equivalent, this page provides verified functional specifications, SOIC-16 package details, real-world use cases in legacy industrial control and test equipment, and validated alternative parts for design continuity and obsolescence mitigation.

Technical Context

The SN74F151BDR implements a single-stage TTL multiplexer architecture with three address inputs (A, B, C), eight data inputs (D0–D7), one active-low strobe (G), and two complementary outputs (Y = selected data, W = inverted selected data). Its enable-controlled selection logic forces Y = LOW and W = HIGH when G is HIGH - a hardwired disable state independent of address or data inputs.

All switching characteristics are specified over 0°C to 70°C with CL = 50 pF and RL = 500 Ω, including tPLH/tPHL for address-to-output (≤10.5 ns), strobe-to-output (≤9.5 ns), and data-to-output (≤7.5 ns). Input thresholds meet standard TTL levels: VIL ≤ 0.8 V, VIH ≥ 2.0 V, ensuring interoperability with 74F, 74LS, and 74S families.

Key Specifications

Pinout & Package

SN74F151BDR is supplied in a 16-pin SOIC (Small-Outline Integrated Circuit) package per TI's D package drawing, with 1.27 mm pitch, 2.00 mm max height, and Q1 pin-1 orientation in tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-to-1 multiplexer applications.

Compared with SN74F151BDR, SN74LS151N trades speed for lower power and cost in legacy designs, while SN74HC151DR enables voltage flexibility and CMOS integration at the expense of drive strength and raw speed - making each viable only where its specific trade-off aligns with system constraints.

Availability

SN74F151BDR is available at Aetrix Electronics and suitable for industrial control logic, test equipment signal routing, legacy bus arbitration, and Boolean function generation requiring stable component supply across long-lifecycle production programs.

Supply support for SN74F151BDR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74F151BDR belongs to TI's 74F Fast TTL logic family, engineered for high-speed digital control applications where propagation delay and drive strength outweigh power efficiency concerns.

FAQ

What is the maximum operating frequency supported by SN74F151BDR?

The SN74F151BDR does not specify a maximum clock frequency, but its worst-case propagation delay (7.5 ns data-to-Y) implies reliable operation up to approximately 130 MHz in synchronous edge-triggered contexts. Real-world frequency limits depend on setup/hold timing of address and data signals relative to strobe assertion, and must be validated per application layout and loading conditions. SN74F151BDR performance remains consistent across its 0°C to 70°C operating range.

Can SN74F151BDR operate from a 3.3 V supply?

No, SN74F151BDR requires a minimum supply voltage of 4.5 V and is rated only for 4.5–5.5 V operation. Applying 3.3 V will result in undefined logic states, excessive propagation delay, and potential output contention. For 3.3 V systems, consider SN74HC151DR or SN74LVC151A - both pin-compatible alternatives with guaranteed 3.3 V operation and documented DC/AC specs at that voltage. SN74F151BDR must be used with a dedicated +5 V rail.

What is the function of the W output on SN74F151BDR?

The W output on SN74F151BDR is the non-inverting, active-HIGH data output - it replicates the logic level of the selected D-input (D0–D7) when the strobe (G) is LOW. When G is HIGH, W is forced LOW regardless of address or data inputs. This behavior enables hardware-level output blanking and simplifies interfacing with downstream latches or registers that require active-HIGH enable paths. SN74F151BDR's dual-output architecture eliminates the need for external inverters in many feedback configurations.

Is SN74F151BDR pin-compatible with SN74LS151N?

Yes, SN74F151BDR and SN74LS151N share identical pin assignments, logic function, and DIP/SOIC package footprints - including matching 16-pin SOIC (D) and PDIP (N) variants. Both observe the same truth table, enable polarity, and output behavior. However, SN74F151BDR offers faster propagation (≤7.5 ns vs. ≤22 ns) and stronger output drive (24 mA vs. 8 mA), so direct substitution is electrically safe but may require timing verification in high-speed designs originally specified for LS logic.

Does SN74F151BDR support hot-swap or live-insertion?

No, SN74F151BDR is not designed for hot-swap operation. Its absolute maximum ratings do not include powered insertion stress testing, and the device lacks bus-hold, power-on reset, or Ioff protection features. Applying VCC or signal inputs while other supplies are absent may cause latch-up or parametric shift. For hot-swap applications, consider modern alternatives like SN74LVC151A with Ioff and power-down isolation. Always power-cycle SN74F151BDR only when all supply and signal lines are stable.