Texas Instruments SN74F151BDRG4

Overview

SN74F151BDRG4 from Texas Instruments is an 8-line to 1-line TTL multiplexer IC used for data routing, Boolean function generation, and parallel-to-serial conversion in digital logic systems. It features three select inputs (A, B, C), one active-low strobe (G), complementary outputs (Y and W), operates at 4.5–5.5 V, supports 0°C to 70°C ambient, and delivers tPHL/tPLH propagation delays as low as 2.5 ns (G→Y) and 1.0 ns (D→W) under loaded conditions.

For engineers reviewing the SN74F151BDRG4 datasheet, SN74F151BDRG4 pinout, SN74F151BDRG4 application, or SN74F151BDRG4 equivalent, key selection criteria include its dual-output (true/inverted) architecture, guaranteed 24 mA low-level output drive, compatibility with standard 16-pin SOIC (D package), and direct use in address/data switching, logic state decoding, and legacy TTL system upgrades without level-shifting.

Technical Context

The SN74F151BDRG4 implements full binary decoding of three select lines (A, B, C) to route one of eight data inputs (D0–D7) to the true output Y and inverted output W. Strobe input G enables or disables multiplexing: when high, Y is forced low and W high - providing active-high enable control with built-in output forcing.

It uses bipolar F-type (fast TTL) technology, ensuring compatibility with 74F logic families, defined DC thresholds (VIL = 0.8 V, VIH = 2.0 V), and AC performance validated across temperature (0°C to 70°C) and supply (4.5–5.5 V). Output drive capability (IOL = 24 mA, IOH = −1 mA) supports direct fanout to multiple TTL loads without buffering.

Key Specifications

Pinout & Package

SN74F151BDRG4 is packaged in a 16-pin SOIC (D package), 7.5 mm wide, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F151BDR and SN74LS151N, the SN74F151BDRG4 delivers fastest switching, highest drive strength, and strictest environmental compliance - making it optimal for timing-critical, high-fanout, or regulated commercial deployments.

Availability

SN74F151BDRG4 is available at Aetrix Electronics and suitable for address/data bus switching, Boolean logic implementation, and parallel-to-serial conversion requiring stable component supply, long-term obsolescence mitigation, and verified RoHS-compliant sourcing.

Supply support for SN74F151BDRG4 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 U.S.-based semiconductor innovator founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74F151BDRG4 belongs to TI's legacy 74F logic family, designed specifically for high-speed, pin-compatible upgrades of 74LS/74S systems while maintaining TTL voltage compatibility and board-level replaceability.

FAQ

What is the maximum clock frequency supported by SN74F151BDRG4 in a multiplexing application?

The SN74F151BDRG4 does not operate on a clock signal - it is asynchronous. Its usable switching rate depends on propagation delay and setup/hold timing. With tPHL/tPLH ≤ 4 ns and minimum pulse width ≥ 8 ns, SN74F151BDRG4 reliably supports enable/data toggle rates up to ~100 MHz in strobe-gated configurations, assuming clean edges and proper load termination.

Does SN74F151BDRG4 support mixed-voltage interfacing, such as 3.3 V logic inputs?

No - SN74F151BDRG4 is a 5 V-only TTL device. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and absolute maximum ratings (−1.2 V to 7 V) do not guarantee reliable operation with 3.3 V CMOS logic without level translation. Direct connection risks marginal switching or excessive input current; a TI SN74LVC4245 or discrete resistor divider is required for safe interfacing.

Can SN74F151BDRG4 be used as a 1-of-8 decoder by tying all data inputs high or low?

Yes - SN74F151BDRG4 functions as a 3-to-8 decoder when G is held low and all D inputs are tied to fixed logic levels (e.g., D0–D7 = H/L pattern matching desired minterms). The Y output reflects the decoded state; W provides inverse. This avoids extra gates and preserves timing predictability inherent to the monolithic design.

What is the meaning of the "G4" suffix in SN74F151BDRG4?

The "G4" suffix in SN74F151BDRG4 indicates TI's green packaging standard: halogen-free mold compound, matte tin (Sn) lead finish instead of traditional SnPb, and compliance with JEDEC J-STD-609A Class 4. It does not affect electrical performance - SN74F151BDRG4 is functionally and pinout-identical to SN74F151BDR, with identical timing, drive, and thermal specs.

Is SN74F151BDRG4 suitable for use in new designs, given its legacy F-series designation?

Yes - SN74F151BDRG4 remains actively manufactured (per TI's 2025 packaging addendum), with SOIC-D tape-and-reel availability, full datasheet support, and long-term supply commitment. Its speed, drive strength, and proven reliability make it appropriate for new industrial control, test equipment, and retro-compatibility projects where TTL-level robustness and deterministic timing are prioritized over ultra-low power.