Texas Instruments SN74HC153DT

Overview

SN74HC153DT from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer in SOIC-16 package, operating from 2 V to 6 V, with typical propagation delay of 32 ns at 4.5 V and ±6-mA output drive capability. It implements full binary decoding for independent channel selection, features separate strobe (G) inputs per channel, and supports parallel-to-serial conversion in digital logic systems.

For engineers reviewing the SN74HC153DT datasheet, SN74HC153DT pinout, SN74HC153DT application, or SN74HC153DT equivalent, this page delivers verified functional modes, switching characteristics at 50 pF and 150 pF loads, absolute maximum ratings, and real-world design implications for multiplexing, address decoding, and signal routing in industrial control and instrumentation circuits.

Technical Context

The SN74HC153DT integrates two independent 4:1 multiplexer sections sharing common address inputs (A, B) but with dedicated strobe (G₁, G₂) and output (Y₁, Y₂) terminals. Each section uses AND-OR logic with inverters and drivers to perform full binary decoding of the 2-bit select lines.

Strobe inputs are active-low: a high level forces the corresponding output low regardless of data or select states. The device operates in standard CMOS logic family with rail-to-rail input thresholds and TTL-compatible output drive, enabling direct interfacing with legacy LSTTL loads.

Key Specifications

Pinout & Package

SN74HC153DT is supplied in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm with 1.27-mm lead pitch and 2.00-mm max height. Pin numbering follows JEDEC MS-012 standard for SOIC-16.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.

Compared with SN74HC153DT, SN74HCT153DR offers improved noise immunity in legacy 5-V environments but consumes more quiescent current, while 74LVX153M delivers superior speed and efficiency at 3.3 V but lacks 5-V compatibility-making SN74HC153DT the optimal choice for flexible 2–6 V industrial designs.

Availability

SN74HC153DT is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74HC153DT 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 solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74HC153DT belongs to TI's 74HC logic family, designed for high-speed, low-power digital signal routing in cost-sensitive industrial and instrumentation applications where robustness and wide supply voltage tolerance are essential.

FAQ

What is the maximum clock frequency supported by SN74HC153DT?

The SN74HC153DT does not operate on a clock signal-it is a combinational logic device whose switching speed depends on input transition rates and load capacitance. With CL = 50 pF and VCC = 4.5 V, its maximum reliable data rate corresponds to a 31.25-MHz period (32 ns tpd), making it suitable for synchronous control up to ~20 MHz in well-designed layouts. The SN74HC153DT datasheet specifies no minimum pulse width or maximum toggle rate, as timing is purely propagation-based.

Can SN74HC153DT interface directly with 3.3-V microcontrollers?

Yes, the SN74HC153DT supports 3.3-V operation within its 2–6 V supply range and has CMOS-compatible input thresholds (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC). At VCC = 3.3 V, VIH = 2.31 V min and VIL = 0.99 V max-fully compatible with standard 3.3-V GPIO outputs. Its outputs swing rail-to-rail, providing clean 3.3-V logic levels back to the MCU. The SN74HC153DT requires no level shifters in 3.3-V systems.

Does SN74HC153DT require external pull-up or pull-down resistors on unused inputs?

Yes-per TI's SCBA004 application report, all unused inputs of the SN74HC153DT must be terminated to VCC or GND to prevent floating nodes that cause increased ICC, oscillation, or erratic output behavior. Inputs A, B, G₁, G₂, and any unconnected Cxy lines must be hard-wired. Leaving them open violates recommended operating conditions and risks functional failure. This requirement applies equally to all SN74HC153DT channels and is critical for stable operation.

How does the strobe (G) input affect SN74HC153DT output behavior?

The strobe inputs G₁ and G₂ are active-low enables: when high, the corresponding output (Y₁ or Y₂) is forced low regardless of data or select inputs. When low, Y₁/Y₂ reflect the selected C₀–C₃ input per the A/B address state. This allows independent gating of each multiplexer output-enabling cascading (e.g., using one SN74HC153DT's Y₁ to drive another's C₀), time-division multiplexing, or conditional signal pass-through. The SN74HC153DT's functional table explicitly defines this behavior across all input combinations.

Is SN74HC153DT pin-compatible with older 74LS153 or 74S153 devices?

No-SN74HC153DT uses SOIC-16 packaging and CMOS electrical characteristics, while 74LS153 and 74S153 are bipolar TTL devices in PDIP-16 packages with different pinouts, drive strengths, and voltage thresholds. Though functionally equivalent as dual 4:1 multiplexers, they are not pin-compatible or drop-in replacements. Substituting SN74HC153DT for LS/S variants requires PCB layout changes and verification of timing margins due to differing propagation delays and noise immunity. The SN74HC153DT is not a direct replacement for 74LS153 or 74S153.