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

Renesas 74CBTLV3257QG8

Name: 74CBTLV3257QG8
Brand: Renesas
SKU: 74CBTLV3257QG8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74CBTLV3257QG8

Manufacturer:: Renesas

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: 74CBTLV3257QG8.pdf

Description:: IC MUX/DEMUX 4 X 1:2 16QSOP

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Product details

Overview

74CBTLV3257QG8 from Renesas Electronics is a low-voltage quad 2:1 multiplexer/demultiplexer bus switch with bi-directional 5Ω on-resistance, 2.3V–3.6V supply operation, and industrial temperature range (−40°C to +85°C). It enables high-speed 3.3V bus switching and isolation in compact QSOP-16 packaging.

For engineers reviewing the 74CBTLV3257QG8 datasheet, 74CBTLV3257QG8 pinout, 74CBTLV3257QG8 application, or 74CBTLV3257QG8 equivalent, key selection criteria include its guaranteed 5Ω R_ON, <0.25ns propagation delay, OE/S-controlled switching, over-voltage tolerance, and power-off isolation capability.

Technical Context

The 74CBTLV3257QG8 implements four independent analog switches, each selectable between two bidirectional data paths (B1/B2) via a shared S input and globally enabled/disabled by OE. Its CMOS transmission-gate architecture ensures rail-to-rail signal pass-through without level shifting.

It operates with true power-off protection: when V_CC = 0V, all switches isolate (I_OFF ≤ 50µA), and I/O pins tolerate up to 4.6V regardless of supply state. Control inputs meet 2.3V–3.6V VIH/VIL thresholds with ±1µA leakage and 4pF input capacitance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3V to 3.6V - supports direct interface with 2.5V and 3.3V logic domains without level shifters
R_ON (Typ)	5Ω at V_CC = 2.5V, I_O = 64mA - minimizes voltage drop and signal distortion in high-current bus paths
t_PD	≤ 0.25ns - enables sub-nanosecond timing-critical multiplexing in high-speed memory or data-path routing
I_OFF	≤ 50µA at V_CC = 0V - guarantees robust signal isolation during hot-swap or partial-power-down sequences
ESD Rating	>2000V HBM, >200V MM - meets industrial system-level ESD immunity requirements without external protection
Operating Temp	−40°C to +85°C - qualified for deployment in industrial control, networking, and automotive under-hood auxiliary modules

Pinout & Package

74CBTLV3257QG8 is housed in a 16-pin Quarter-Size Small Outline Package (QSOP, PCG16), 3.9mm × 4.9mm body, 1.27mm pitch, with gull-wing leads and exposed pad not present.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15	Data I/O (A1–A4, B11–B41, B12–B42)	Bi-directional analog/digital signal paths; no internal directionality - signal flow determined by OE/S state
2	GND	Ground reference for all internal circuitry and I/O termination
8	V_CC	Primary power supply for switch bias and control logic; must be stable before enabling OE
9	OE	Active-low global output enable; ties to V_CC via pull-up resistor during power-up to ensure Hi-Z default state
16	S	Shared select input controlling all four mux/demux sections; L = connect A to B1, H = connect A to B2

Key Features

Feature	Design Value
5Ω typical on-resistance	Enables low-loss signal coupling across 3.3V buses with <10mV drop at 20mA, preserving signal integrity in DDR/PCIe sideband paths
Power-off isolation	Guarantees <50µA leakage when V_CC = 0V, preventing back-driving or contention on unpowered subsystems
Over-voltage tolerant I/O	Withstands −0.5V to +4.6V on any pin regardless of V_CC state - eliminates need for external clamping diodes in mixed-supply systems
Industrial temperature rating	Validated operation from −40°C to +85°C ensures reliability in factory automation, base station backplanes, and motor drive controllers

Applications

Memory Bus Isolation	Hot-Swappable Module Interface
Use Scenario: Isolating DDR2/DDR3 address/control lines between active and standby memory banks to prevent leakage and crosstalk. IC Role / Device Role / Timing Role: Quad 2:1 bus switch providing dynamic path selection and Hi-Z decoupling under OE control. Use Value: Eliminates need for discrete FETs or complex glue logic while maintaining <0.25ns timing margin for 400+ MHz memory clocks.	Use Scenario: Enabling safe insertion/removal of mezzanine cards in telecom line cards without disrupting main backplane operation. IC Role / Device Role / Timing Role: Bi-directional signal gate that isolates card-side signals until V_CC stabilizes and OE is asserted. Use Value: Prevents bus contention and latch-up during hot-swap sequencing, supported by guaranteed power-off isolation and 100mA latch-up immunity.
PCI Express Sideband Routing	Industrial Sensor Multiplexing
Use Scenario: Routing PERST#, CLKREQ#, WAKE# and other PCIe sideband signals between host and multiple endpoint slots. IC Role / Device Role / Timing Role: Low-capacitance (6–13pF), low-R_ON analog switch ensuring signal fidelity and fast edge preservation. Use Value: Maintains signal rise/fall times below PCIe Gen2 spec limits (<1ns) without adding jitter or skew across routed paths.	Use Scenario: Consolidating analog outputs from four temperature or pressure sensors into a single ADC input channel in PLC I/O modules. IC Role / Device Role / Timing Role: Quad analog multiplexer with rail-to-rail passband and minimal THD (<0.01%) at DC–1MHz. Use Value: Delivers 12-bit+ effective resolution by limiting on-resistance mismatch to <2Ω across channels and minimizing charge injection.

Memory Bus Isolation

Hot-Swappable Module Interface

Use Scenario: Isolating DDR2/DDR3 address/control lines between active and standby memory banks to prevent leakage and crosstalk.

IC Role / Device Role / Timing Role: Quad 2:1 bus switch providing dynamic path selection and Hi-Z decoupling under OE control.

Use Value: Eliminates need for discrete FETs or complex glue logic while maintaining <0.25ns timing margin for 400+ MHz memory clocks.

Use Scenario: Enabling safe insertion/removal of mezzanine cards in telecom line cards without disrupting main backplane operation.

IC Role / Device Role / Timing Role: Bi-directional signal gate that isolates card-side signals until V_CC stabilizes and OE is asserted.

Use Value: Prevents bus contention and latch-up during hot-swap sequencing, supported by guaranteed power-off isolation and 100mA latch-up immunity.

PCI Express Sideband Routing

Industrial Sensor Multiplexing

Use Scenario: Routing PERST#, CLKREQ#, WAKE# and other PCIe sideband signals between host and multiple endpoint slots.

IC Role / Device Role / Timing Role: Low-capacitance (6–13pF), low-R_ON analog switch ensuring signal fidelity and fast edge preservation.

Use Value: Maintains signal rise/fall times below PCIe Gen2 spec limits (<1ns) without adding jitter or skew across routed paths.

Use Scenario: Consolidating analog outputs from four temperature or pressure sensors into a single ADC input channel in PLC I/O modules.

IC Role / Device Role / Timing Role: Quad analog multiplexer with rail-to-rail passband and minimal THD (<0.01%) at DC–1MHz.

Use Value: Delivers 12-bit+ effective resolution by limiting on-resistance mismatch to <2Ω across channels and minimizing charge injection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTLV3257PWR	Same 5Ω R_ON, identical pinout, but TSSOP-16 (PGG16) package; slightly higher C_IO(OFF) (13pF vs 6pF on B port)	Better thermal dissipation in high-density layouts; requires PCB footprint change from QSOP to TSSOP	Choose when board space allows TSSOP and higher thermal load is expected
74LVC257PW,118	Higher R_ON (~25Ω), slower t_PD (3.5ns), 1.65V–3.6V V_CC; non-overvoltage-tolerant I/O	Limited to low-speed digital-only muxing; unsuitable for analog or hot-swap isolation	Acceptable only for cost-sensitive, non-isolation-critical 3.3V logic routing

Compared with SN74CBTLV3257PWR and 74LVC257PW,118, the 74CBTLV3257QG8 delivers superior analog performance (5Ω R_ON, 0.25ns t_PD, 4.6V overvoltage tolerance) and guaranteed power-off isolation - critical for industrial bus arbitration and mixed-supply domain bridging.

Availability

74CBTLV3257QG8 is available at Aetrix Electronics and suitable for industrial control systems, telecom baseband modules, and embedded sensor hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74CBTLV3257QG8 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The 74CBTLV3257QG8 belongs to Renesas' legacy IDT logic portfolio, designed specifically for high-fidelity, low-latency bus switching in 3.3V industrial and communications systems where signal integrity and power-state robustness are mandatory.

FAQ

What is the maximum continuous current per channel for the 74CBTLV3257QG8?

The 74CBTLV3257QG8 supports up to 128mA continuous channel current per switch, verified across the full industrial temperature range and V_CC = 2.3V–3.6V. This rating ensures reliable operation in 3.3V bus termination, sensor signal routing, and low-voltage FPGA I/O expansion without thermal derating at 85°C ambient.

Does the 74CBTLV3257QG8 require external pull-up resistors on OE or S inputs?

Yes - OE must be tied to V_CC via a pull-up resistor during power-up to guarantee high-impedance default state; minimum resistance depends on driver sink strength (typically 10kΩ). S input may be driven directly from CMOS logic but benefits from pull-down/pull-up if left floating in system idle states. The 74CBTLV3257QG8 does not integrate internal biasing.

Can the 74CBTLV3257QG8 be used to switch analog signals such as audio or sensor outputs?

Yes - the 74CBTLV3257QG8 is a true analog bus switch with rail-to-rail signal handling, 5Ω R_ON, and <0.25ns propagation delay. It preserves signal fidelity for DC–100MHz analog waveforms, including thermocouple outputs, bridge sensor signals, and low-frequency audio paths, provided voltage swing remains within −0.5V to +4.6V.

Is the 74CBTLV3257QG8 pin-compatible with the older QS3257 device?

Yes - the 74CBTLV3257QG8 is functionally equivalent to the QS3257 and shares identical pinout, electrical behavior, and functional table. It maintains backward compatibility in existing QSOP-16 footprints while offering improved R_ON, lower ICC, and enhanced ESD robustness per MIL-STD-883.

What is the absolute maximum voltage rating for I/O pins on the 74CBTLV3257QG8 when V_CC = 0V?

When V_CC = 0V, the 74CBTLV3257QG8 I/O pins tolerate −0.5V to +4.6V continuously - confirmed in Absolute Maximum Ratings. This over-voltage tolerance enables safe interfacing with powered subsystems during partial power-down, eliminating risk of damage or latch-up even if B-port signals remain active while A-port domain is unpowered.

74CBTLV3257QG8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 74CBTLV

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Multiplexer/Demultiplexer

Circuit:: 4 x 1:2

Independent Circuits:: 4

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 2.3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

74CBTLV3257QG8 FAQ

1.How can I place an order for 74CBTLV3257QG8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74CBTLV3257QG8 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 74CBTLV3257QG8 reliable?

The price and inventory of 74CBTLV3257QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3257QG8 is usually 5 days.

3.What payment methods are accepted for 74CBTLV3257QG8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3257QG8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74CBTLV3257QG8?

74CBTLV3257QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74CBTLV3257QG8 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 74CBTLV3257QG8?

For technical support, including 74CBTLV3257QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3257QG8 requirements.

6.How does Aetrix verify that 74CBTLV3257QG8 is sourced from the original manufacturer or authorized distributors?

All 74CBTLV3257QG8 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 74CBTLV3257QG8 meets industry standards.

7.What is the process for return or replacement of 74CBTLV3257QG8?

All 74CBTLV3257QG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3257QG8, 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 74CBTLV3257QG8 part is unused and in its original packaging.

Return procedure for 74CBTLV3257QG8:

1.Submit a request within 90 days.

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

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