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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

STMicroelectronics 74LCX157TTR

Name: 74LCX157TTR
Brand: STMicroelectronics
SKU: 74LCX157TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX157TTR

Manufacturer:: STMicroelectronics

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74LCX157TTR.pdf

Description:: IC MULTIPLEXER 4 X 2:1 16TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LCX157TTR from STMicroelectronics is a low-voltage CMOS quad 2-channel non-inverting multiplexer with 5V-tolerant inputs, operating at 2.0–3.6 V supply, delivering 6.0 ns max propagation delay at 3 V, ±24 mA output drive, and pin/function compatibility with standard 74-series 157 logic. It routes A/B data sources to Y outputs under common SELECT/STROBE control in 3.3 V bus interfaces.

For engineers reviewing the 74LCX157TTR datasheet, 74LCX157TTR pinout, 74LCX157TTR application, or 74LCX157TTR equivalent, key selection criteria include 5V input tolerance, symmetrical 24 mA drive capability, latch-up immunity (>500 mA), ESD robustness (HBM > 2 kV), and TSSOP-16 packaging for high-density PCB layouts.

Technical Context

The device implements four independent 2:1 multiplexers sharing one SELECT line and one active-low STROBE enable. When STROBE is high, all Y outputs are forced low regardless of SELECT state-enabling bus isolation during power-down or standby modes.

Its C2MOS sub-micron process ensures balanced tPLH ≅ tPHL propagation delays and supports PCI bus signaling levels at 24 mA drive. Input protection circuits guarantee 5V tolerance while operating from a 3.3 V supply, eliminating level-shifter requirements in mixed-voltage systems.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.0 V to 3.6 V - enables direct integration into 3.3 V logic domains with 1.5 V data retention
tPD (max)	6.0 ns at VCC = 3.0 V - matches AC/ACT speed at lower voltage, suitable for 100+ MHz data routing
IOL / IOH	±24 mA at VCC = 3.0–3.6 V - drives standard PCI loads without external buffers
Input Voltage	0 to 5.5 V - accepts 5 V TTL/CMOS signals directly, no level translation needed
ESD HBM	>2000 V - meets MIL-STD-883 Class 3A for handling robustness in assembly and field use
Latch-up	>500 mA per JESD17 - prevents destructive current runaway during overvoltage transients

Pinout & Package

TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, thin-profile surface-mount design optimized for automated assembly and thermal performance in compact layouts.

Pin/Terminal	Circuit Role	Design Meaning
1	SELECT	Common 2:1 select control for all four multiplexers; determines whether A or B inputs appear at Y outputs
2,5,11,14	1A–4A	Data inputs from source A; 5V-tolerant, compatible with legacy 5V logic families
3,6,10,13	1B–4B	Data inputs from source B; electrically identical to A inputs, enabling dual-bus selection
4,7,9,12	1Y–4Y	Non-inverting multiplexer outputs; symmetrical 24 mA drive supports fanout to multiple loads
15	STROBE	Active-high enable; when high, forces all Y outputs low for bus contention prevention or power-down isolation
8	GND	Digital ground reference; decoupling capacitor placement critical for noise suppression at high-speed switching
16	VCC	Positive supply (2.0–3.6 V); requires local 100 nF ceramic bypass near pin for stable operation

Key Features

Feature	Design Value
5V-tolerant inputs	Accepts 0–5.5 V input signals while powered from 3.3 V supply, eliminating external level shifters
Symmetrical output drive	IOH = IOL = 24 mA (min) at 3.3 V - ensures consistent rise/fall times and signal integrity across logic transitions
Power-down protection	Inputs and outputs remain high-impedance and ESD-protected during VCC = 0 V - prevents back-driving or damage in partial-power scenarios
PCI bus compliance	Guaranteed 24 mA drive at 3.3 V meets PCI Local Bus Specification electrical requirements for add-in card interfaces

Applications

PCI Add-in Card Interface

Low-Voltage Bus Multiplexing

Use Scenario: Selecting between two memory-mapped peripheral buses on a 3.3 V PCI expansion card.

IC Role / Device Role / Timing Role: Quad 2:1 multiplexer routing address/data lines under shared SELECT/STROBE control with sub-7 ns propagation.

Use Value: Enables dual-bank peripheral access using single bus controller, reducing FPGA I/O count and PCB layer count.

Use Scenario: Sharing a single ADC interface between two sensor banks in an industrial data acquisition module.

IC Role / Device Role / Timing Role: Non-inverting multiplexer selecting analog front-end channel pairs with matched tPLH/tPHL for synchronized sampling.

Use Value: Eliminates need for separate ADCs or complex analog switches; maintains timing coherence across channels.

Hot-Swappable Backplane Slot

Legacy-to-Modern Logic Bridge

Use Scenario: Isolating bus signals during hot-insertion of a 3.3 V mezzanine card into a 5 V backplane system.

IC Role / Device Role / Timing Role: STROBE-controlled output disable prevents bus contention; 5V-tolerant inputs accept backplane control signals directly.

Use Value: Ensures safe insertion/removal without disrupting master controller or other slots; no sequenced power required.

Use Scenario: Interfacing a 5 V microcontroller GPIO bank to a 3.3 V FPGA configuration interface.

IC Role / Device Role / Timing Role: Level-translating multiplexer enabling bidirectional signal routing with precise timing control via SELECT/STROBE.

Use Value: Replaces discrete MOSFET translators; reduces component count and layout area while preserving setup/hold margins.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC157PW	Lower drive (±24 mA only at VCC ≥ 3.0 V); no guaranteed 5V tolerance above 3.6 V input	Requires strict 3.3 V-only input environment; unsuitable for mixed 5 V/3.3 V signal domains	Select when full 5V tolerance is unnecessary and cost is prioritized over interface flexibility
SN74LVCH162374DGGR	16-bit registered bus switch with 3-state outputs; not a multiplexer - lacks SELECT/STROBE logic	Used for bus hold/latching, not dynamic signal routing; incompatible truth table and control architecture	Choose only if latched data forwarding is required instead of real-time multiplexing

Compared with 74LVC157PW and SN74LVCH162374DGGR, the 74LCX157TTR uniquely combines 5V input tolerance, true quad 2:1 multiplexing with STROBE gating, and PCI-compliant drive strength - making it irreplaceable in mixed-voltage bus arbitration and hot-swap isolation roles.

Availability

74LCX157TTR is available at Aetrix Electronics and suitable for PCI add-in cards, industrial data acquisition systems, hot-swappable backplane slots, and legacy-to-modern logic bridges requiring stable component supply and long-term lifecycle support.

Supply support for 74LCX157TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer applications.

The 74LCX logic family targets low-voltage, high-speed 3.3 V systems requiring 5V input compatibility and PCI-level drive - optimized for bus interface, signal routing, and mixed-voltage interoperability.

FAQ

Can 74LCX157TTR operate with VCC = 1.8 V?

No. The recommended operating VCC range is 2.0 V to 3.6 V. At 1.8 V, the device does not meet guaranteed specifications for propagation delay, output drive, or input threshold levels. Data retention is specified down to 1.5 V, but functional operation requires minimum 2.0 V supply.

Is the STROBE pin active-high or active-low?

The STROBE pin is active-high. When STROBE = HIGH, all Y outputs are forced LOW regardless of SELECT state or A/B input values. When STROBE = LOW, the multiplexer operates normally, routing selected A or B inputs to Y outputs.

Does 74LCX157TTR support hot-plug insertion with VCC = 0 V?

Yes. With VCC = 0 V, the device exhibits power-off leakage current ≤10 µA and maintains 5V-tolerant input protection. Inputs and outputs remain high-impedance and ESD-protected, preventing back-driving or latch-up during hot insertion into live backplanes.

What is the maximum clock frequency supported for data routing?

While not a clocked device, the 74LCX157TTR supports data routing up to ~160 MHz based on its 6.0 ns max propagation delay and 1.0 ns max output skew. System-level timing must account for board trace delays, load capacitance, and setup/hold margins at the destination register.

74LCX157TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LCX

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Multiplexer

Circuit:: 4 x 2:1

Independent Circuits:: 1

Current - Output High, Low:: 24mA, 24mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

74LCX157TTR FAQ

1.How can I place an order for 74LCX157TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX157TTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74LCX157TTR reliable?

The price and inventory of 74LCX157TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX157TTR is usually 5 days.

3.What payment methods are accepted for 74LCX157TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX157TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX157TTR?

74LCX157TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX157TTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74LCX157TTR?

For technical support, including 74LCX157TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX157TTR requirements.

6.How does Aetrix verify that 74LCX157TTR is sourced from the original manufacturer or authorized distributors?

All 74LCX157TTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LCX157TTR meets industry standards.

7.What is the process for return or replacement of 74LCX157TTR?

All 74LCX157TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX157TTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74LCX157TTR part is unused and in its original packaging.

Return procedure for 74LCX157TTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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