Texas Instruments SN74AHC157DGVR

Overview

SN74AHC157DGVR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in TVSOP-16 package, operating from 2 V to 5.5 V supply, with 8 ns typical propagation delay at 5 V (CL = 15 pF), ±8 mA output drive, and true (non-inverted) data routing. It serves as a digital signal routing IC in bus management, data path selection, and logic-level translation circuits within industrial control and instrumentation systems.

For engineers reviewing the SN74AHC157DGVR datasheet, SN74AHC157DGVR pinout, SN74AHC157DGVR application, or SN74AHC157DGVR equivalent, key selection criteria include its active-low strobe (G) control, A/B address select logic, 16-pin TVSOP footprint, latch-up immunity (>250 mA), and ESD robustness (2000 V HBM).

Technical Context

The SN74AHC157DGVR implements four independent 2:1 multiplexers sharing a common active-low strobe (G) input and a single address select (A/B) input. When G is high, all Y outputs are forced low regardless of A/B or data inputs; when G is low, each Y output reflects the selected input (1A/1B, 2A/2B, etc.) based on the A/B state. The device uses advanced CMOS AHC logic for rail-to-rail swing and low static current.

Its functional behavior follows positive-logic truth table: G = L enables selection, A/B = L routes A-inputs to outputs, A/B = H routes B-inputs. No internal latching or memory is present - it is purely combinational. All inputs tolerate 5.5 V regardless of VCC, supporting mixed-voltage interfacing.

Key Specifications

Pinout & Package

SN74AHC157DGVR is housed in a 3.6 mm × 6.4 mm TVSOP-16 package (DGV), with 0.5 mm lead pitch and exposed thermal pad (optional GND connection). Pin numbering follows standard SOIC/SSOP orientation (pin 1 top-left, pin 16 bottom-right).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC157APWR and 74HC157D,653, the SN74AHC157DGVR uniquely balances 5 V interoperability, sub-10 ns speed, and industrial temperature support - making it optimal for new designs requiring both performance and voltage flexibility.

Availability

SN74AHC157DGVR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital audio signal routing, test equipment signal switching, and embedded system bus arbitration requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for SN74AHC157DGVR 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 50 years of innovation in high-reliability digital ICs.

The SN74AHC157DGVR belongs to TI's AHC logic family, engineered for high-speed, low-power, and wide-supply-voltage operation in industrial automation, test equipment, and communications infrastructure.

FAQ

What is the maximum clock/data rate supported by SN74AHC157DGVR?

The SN74AHC157DGVR is a combinational multiplexer-not a clocked device-so it has no inherent clock rate limit. Its usable data rate depends on propagation delay and system timing margins. With 4.1 ns typical tPLH/tPHL at 5 V (CL = 15 pF), it supports clean signal routing up to ~100 MHz in well-designed PCB layouts with controlled impedance and proper termination.

Does SN74AHC157DGVR include internal pull-up or pull-down resistors on unused inputs?

No, the SN74AHC157DGVR does not integrate bus-hold or weak pull resistors. All unused inputs-including A/B, G, and any unconnected data lines-must be externally tied to VCC or GND to prevent floating states, excessive ICC, and potential oscillation. TI explicitly recommends this in Section 4.3 of the datasheet.

Can SN74AHC157DGVR safely interface between 3.3 V and 5 V logic domains?

Yes. The SN74AHC157DGVR accepts input voltages up to 5.5 V regardless of VCC (which may be 3.3 V), and its outputs swing rail-to-rail. When powered at 3.3 V, it can reliably receive 5 V inputs and drive 3.3 V–compatible loads-making it suitable for bidirectional level translation in mixed-voltage systems without external resistors or translators.

What is the thermal pad on the SN74AHC157DGVR package used for, and how should it be connected?

The thermal pad on the SN74AHC157DGVR (TVSOP-16) is optional and may be connected to GND or left floating-TI specifies it must not be connected to any signal or supply other than GND. While not required for functionality, grounding the pad improves thermal dissipation and reduces junction temperature under sustained output loading, especially at elevated ambient temperatures.

Is SN74AHC157DGVR pin-compatible with older 74HC157 variants?

Yes, the SN74AHC157DGVR shares identical pinout and function mapping with 74HC157, 74HCT157, and SN74LS157 in the same 16-pin SOIC/SSOP/TVSOP footprints. However, due to differences in speed, drive strength, and input thresholds, direct substitution requires verification of timing margins and voltage compatibility in the target application.