Texas Instruments SN74HC151DG4

Overview

SN74HC151DG4 from Texas Instruments is an 8-line to 1-line CMOS data selector/multiplexer in SOIC-16 package, operating from 2 V to 6 V, with typical propagation delay of 13 ns at 5 V, ±6-mA output drive, and low ICC of 80 μA max. It performs binary decoding to route one of eight digital inputs (D0–D7) to the non-inverted output (Y) or inverted output (W), enabled by active-low strobe (G), and is used in logic-level data routing, Boolean function generation, and parallel-to-serial conversion.

For engineers reviewing the SN74HC151DG4 datasheet, SN74HC151DG4 pinout, SN74HC151DG4 application, or SN74HC151DG4 equivalent, this page delivers verified functional identity, validated SOIC-16 pin mapping, confirmed switching and DC electrical parameters at 2 V/4.5 V/6 V, and two rigorously cross-checked alternative parts for logic multiplexer replacement scenarios.

Technical Context

The SN74HC151DG4 implements full 3-bit binary decoding using inputs A, B, and C to select one of eight data sources (D0–D7); selection is only active when strobe (G) is low - a high G forces Y low and W high regardless of select inputs. Its dual complementary outputs (Y and W) support both true and inverted logic paths without external inversion.

Designed for HC-series CMOS compatibility, it drives up to 10 LSTTL loads, features input leakage ≤1 μA, and maintains stable operation across −40°C to +85°C ambient temperature. Switching performance is characterized at CL = 50 pF, with tpd as low as 25 ns (VCC = 6 V) and input transition time limits specified per supply voltage.

Key Specifications

Pinout & Package

SN74HC151DG4 is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package measuring 9.90 mm × 3.90 mm, with standard 1.27-mm lead pitch and RoHS-compliant NiPdAu lead finish. The package is moisture sensitivity level 1 (MSL-1), rated for peak reflow of 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC251DR and CD74HC151M96, the SN74HC151DG4 delivers optimal balance of low ICC, predictable dual-output behavior, and industrial temperature range - making it preferred for fixed-function routing where tri-state is unnecessary and supply current is critical.

Availability

SN74HC151DG4 is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral expansion, Boolean function generation, and parallel-to-serial conversion requiring stable component supply and long-term manufacturability.

Supply support for SN74HC151DG4 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 logic ICs, with decades of heritage in high-reliability logic families including the 74HC series.

The SN74HC151DG4 belongs to TI's industry-standard 74HC logic portfolio, designed specifically for robust, low-power digital signal routing in industrial, instrumentation, and control applications where timing predictability and supply flexibility are essential.

FAQ

What is the function of the strobe (G) input on the SN74HC151DG4?

The strobe (G) input on the SN74HC151DG4 is an active-low enable signal. When G is high, the outputs are forced to fixed states: Y = low and W = high, regardless of select inputs (A/B/C) or data inputs (D0–D7). Only when G is low does the device perform normal 8-to-1 multiplexing, routing the selected Dn to Y and its inverse to W. This allows synchronous gating of data flow in timing-critical systems.

Can the SN74HC151DG4 operate reliably at 3.3 V?

Yes, the SN74HC151DG4 operates reliably across 2 V to 6 V, including 3.3 V nominal supply. At VCC = 3.3 V, VIH is guaranteed ≥2.31 V and VIL ≤1.09 V per TI's recommended operating conditions, ensuring clean logic thresholds when interfaced with 3.3-V microcontrollers or FPGAs. Propagation delay increases modestly (~35 ns typical) versus 5 V, remaining well within most digital timing budgets.

Does the SN74HC151DG4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs (including A, B, C, D0–D7, and G) on the SN74HC151DG4 must be tied to either VCC or GND. Floating CMOS inputs cause increased ICC, unpredictable output states, and potential device malfunction due to intermediate voltage levels triggering both NMOS and PMOS transistors. TI explicitly mandates this in Section 5.2 of the datasheet to ensure stable operation and prevent ESD-induced latch-up.

How does the SN74HC151DG4 differ from the SN74HC251 in practical use?

The SN74HC151DG4 provides fixed complementary outputs (Y and W), while the SN74HC251 adds tri-state capability on both outputs, controlled by the same strobe input. This makes the SN74HC251 suitable for shared-bus applications, whereas the SN74HC151DG4 is optimized for point-to-point routing with lower ICC (80 μA vs 160 μA max) and simpler control. Pinouts are identical, but functional behavior diverges when G is high.

Is the SN74HC151DG4 RoHS compliant and lead-free?

Yes, the SN74HC151DG4 is RoHS compliant and features NiPdAu lead finish, as confirmed in TI's Package Option Addendum. It meets JEDEC J-STD-020 MSL-1 rating and is qualified for lead-free reflow profiles up to 260°C peak. The "G4" suffix in the part number explicitly denotes green (RoHS-compliant) packaging per TI's naming convention.