Texas Instruments SN74LVC157DR

Overview

SN74LVC157DR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer designed for 1.65-V to 3.6-V V_CC operation, featuring a common strobe (G) input, true-data output logic, and 5.5-V-tolerant inputs enabling mixed-voltage translation between 3.3-V and 5-V systems in digital control and data routing applications.

For engineers reviewing the SN74LVC157DR datasheet, SN74LVC157DR pinout, SN74LVC157DR application, or SN74LVC157DR equivalent, this device supports high-speed data selection with propagation delay as low as 5.2 ns at 3.3 V, rail-to-rail output swing, latch-up immunity >250 mA, and ESD protection exceeding 2000 V per MIL-STD-883.

Technical Context

The SN74LVC157DR implements four independent 2:1 multiplexers sharing one active-low strobe (G) and one select (A/B) control line. When G is high, all Y outputs are forced low regardless of A/B or data inputs; when G is low, the A/B signal determines whether the A-group (1A–4A) or B-group (1B–4B) drives the corresponding Y outputs (1Y–4Y).

It uses TI's EPIC™ submicron CMOS process, delivering low ground bounce (<0.8 V) and undershoot (>2 V) at 3.3 V, with input thresholds scaled to V_CC (e.g., V_IL = 0.35×V_CC at 1.65–1.95 V), ensuring robust noise margins across its 1.65–3.6-V operating range.

Key Specifications

Pinout & Package

SN74LVC157DR is supplied in a 16-pin SOIC (D) package with 1.27-mm pitch, 10.3-mm body width, and JEDEC MS-012AC compliance. Pin assignments are validated per TI SCAS292G datasheet Figure 1 (top view).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel 2:1 multiplexer applications.

Compared with SN74LVC157DR, SN74LVCH157A adds input bus-hold for floating-input resilience, while 74LVC157PW offers identical functionality in a smaller TSSOP package-both require no schematic changes but differ in layout and system-level robustness trade-offs.

Availability

SN74LVC157DR is available at Aetrix Electronics and suitable for industrial control systems, FPGA peripheral expansion, mixed-voltage data routing, and automated test equipment requiring stable component supply and long-term manufacturability.

Supply support for SN74LVC157DR 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 decades of experience in high-reliability industrial and automotive IC design.

The SN74LVC157DR belongs to TI's LVC logic family-designed specifically for low-voltage, high-speed, mixed-signal interfacing in space- and power-constrained embedded systems.

FAQ

What is the maximum clock/data rate supported by the SN74LVC157DR?

The SN74LVC157DR does not operate on a clock; it is a combinational multiplexer. Its maximum usable data rate is determined by propagation delay: t_pd ≤ 6.8 ns at 3.3 V, supporting reliable operation with input signal edges spaced ≥14 ns apart-equivalent to a 71-MHz toggle rate on control lines and ~147-MHz effective data throughput in synchronous bus applications using SN74LVC157DR.

Can the SN74LVC157DR be used with a 5-V microcontroller driving its inputs?

Yes. The SN74LVC157DR accepts input voltages up to 5.5 V regardless of V_CC, making it fully compatible with 5-V microcontrollers even when powered from 1.65–3.6 V. This allows direct connection without level shifters-verified in TI's SCAS292G datasheet Section "Inputs Accept Voltages to 5.5 V" and confirmed by absolute maximum rating VI = –0.5 V to 6.5 V for SN74LVC157DR.

Does the SN74LVC157DR have power-on reset or glitch suppression features?

No. The SN74LVC157DR is a purely combinational device with no internal reset, power-on initialization, or glitch filtering. Outputs reflect input states with propagation delay; undefined behavior occurs if G or A/B change while data inputs are unstable. Proper system-level synchronization-such as holding G high until control signals settle-is required, as documented in the "recommended operating conditions" table of the SN74LVC157DR datasheet.

What is the recommended bypass capacitor for the SN74LVC157DR V_CC pin?

A 0.1-µF ceramic capacitor placed as close as possible to the V_CC pin (Pin 9) and GND (Pin 8) is mandatory for stable operation of the SN74LVC157DR. TI's application guidance in SCAS292G emphasizes this to suppress switching noise and ground bounce-especially critical given the device's sub-7-ns propagation delay and 24-mA drive capability, which can induce significant transient currents on the supply rail.

Is the SN74LVC157DR pin-compatible with older TTL or CMOS multiplexers like the 74LS157?

No. While functionally equivalent to the 74LS157, the SN74LVC157DR has different DC electrical characteristics (e.g., V_IL/V_IH thresholds tied to V_CC, not fixed 0.8 V/2.0 V), higher speed, and 5.5-V-tolerant inputs. Its pinout matches the industry-standard 16-pin SOIC layout for 4-channel 2:1 muxes-including 74LVC157 variants-but it is not a drop-in replacement for bipolar 74LS157 due to incompatible input thresholds and output drive strength. Always verify logic levels and timing in the target system when substituting SN74LVC157DR.