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

Renesas 74CBTLV3251QG8

Name: 74CBTLV3251QG8
Brand: Renesas
SKU: 74CBTLV3251QG8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74CBTLV3251QG8

Manufacturer:: Renesas

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: 74CBTLV3251QG8.pdf

Description:: IC MUX/DEMUX 1 X 8:1 16QSOP

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Product details

Overview

74CBTLV3251QG8 from Renesas Electronics is a low-voltage 1-of-8 bi-directional multiplexer/demultiplexer IC with 5Ω on-state resistance, 2.3V–3.6V supply range, and industrial temperature operation (−40°C to +85°C). It routes signals between one common A port and eight selectable B ports (B1–B8) using three address lines (S0–S2) and an active-low output-enable (OE), used in high-speed data path switching for FPGA I/O expansion and memory interface routing.

For engineers reviewing the 74CBTLV3251QG8 datasheet, 74CBTLV3251QG8 pinout, 74CBTLV3251QG8 application, or 74CBTLV3251QG8 equivalent, key selection criteria include guaranteed 5Ω R_ON, power-off isolation, over-voltage tolerance up to 4.6V, sub-5ns enable/disable timing, and QSOP-16 package compatibility with space-constrained board layouts.

Technical Context

The 74CBTLV3251QG8 implements a CMOS-based analog switch architecture with rail-to-rail signal handling across its 8:1 bidirectional path. Its control logic uses active-low OE and binary-encoded S0–S2 to select one of eight B-port connections to the A port, with all switches disabled when OE is high.

Designed for low-voltage digital systems, it supports V_CC down to 2.3V while maintaining <5ns propagation delay (t_PD ≤ 0.25ns typical), <5µA off-state leakage (I_OZ), and latch-up immunity exceeding 100mA - enabling robust operation in mixed-signal environments with shared voltage domains.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3V to 3.6V - ensures compatibility with 2.5V and 3.3V logic families without level-shifting.
R_ON	5Ω typical - minimizes insertion loss and signal distortion in high-speed data paths up to 200MHz.
t_PD	≤ 0.25ns - enables sub-nanosecond timing-critical switching in test equipment and serial link reconfiguration.
I_OZ (off-state)	≤ 5µA at V_CC = 3.6V - prevents signal bleed-through during disable, critical for bus isolation.
Operating Temp	−40°C to +85°C - validated for industrial-grade reliability in factory automation and telecom infrastructure.
ESD Rating	>2000V HBM - protects against handling damage during PCB assembly and field service.
Power-off Isolation	Yes - maintains high-impedance state even when V_CC = 0V, preventing back-driving of powered subsystems.

Pinout & Package

74CBTLV3251QG8 is packaged in a 16-pin Quarter-Size Small Outline Package (QSOP), 3.9mm × 4.9mm body, 1.27mm pitch, with gull-wing leads suitable for surface-mount reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
A	Common I/O Port	Bidirectional signal terminal connected to selected B port; must be terminated to avoid floating.
B1–B8	Input/Output Ports	Eight selectable bidirectional terminals; only one connected to A at any time per S0–S2 and OE state.
S0, S1, S2	Address Inputs	Binary-select lines (LSB to MSB); drive standard CMOS logic levels with ≤4pF input capacitance.
OE	Active-Low Output Enable	When high, all switches open; tied to V_CC via pull-up resistor for safe power-up state.
V_CC	Supply Voltage	Primary power rail; decoupling capacitor required within 1cm for stable high-speed switching.
GND	Ground Reference	Signal and power return; separate ground plane recommended to minimize noise coupling.

Key Features

Feature	Design Value
Bi-directional 8:1 Switching	Supports data flow in either direction between A and any B port, eliminating need for separate MUX/DEMUX ICs.
5Ω On-State Resistance	Reduces voltage drop and timing skew in high-current I/O paths such as DDR address/control buses.
Over-Voltage Tolerance	Withstands −0.5V to +4.6V on all I/O pins regardless of V_CC state - simplifies mixed-voltage system interfacing.
Power-Off Isolation	Guarantees >1MΩ isolation between ports when V_CC = 0V - prevents unintended current paths in hot-swap or partial-power-down systems.
Latch-Up Immunity	Exceeds 100mA per JEDEC JESD78 - ensures robustness against transient faults in noisy industrial environments.

Applications

FPGA I/O Expansion	Memory Address Multiplexing
Use Scenario: Expanding limited FPGA GPIO count by sharing a single high-speed I/O bank across multiple peripheral devices (e.g., sensors, DACs, UARTs). IC Role / Device Role / Timing Role: Bidirectional signal router controlled by FPGA GPIOs; provides sub-5ns path selection latency. Use Value: Eliminates need for additional level translators or discrete switches while preserving signal integrity up to 200MHz.	Use Scenario: Reducing address line count in microcontroller-based systems with multiple SRAM or flash devices sharing a common data bus. IC Role / Device Role / Timing Role: Low-latency address demultiplexer that selects one memory device's address inputs based on chip-select encoding. Use Value: Enables 8x memory density scaling without increasing MCU pin count or adding wait states.
Test Equipment Signal Routing	Industrial Sensor Hub Interface
Use Scenario: Automated test fixtures requiring dynamic reconfiguration of signal paths between DUT, instruments, and calibration references. IC Role / Device Role / Timing Role: High-reliability analog switch matrix with guaranteed power-off isolation and ESD-hardened I/O. Use Value: Prevents cross-talk and back-driving during hot reconfiguration, supporting unattended 24/7 operation.	Use Scenario: Aggregating analog or digital outputs from eight temperature, pressure, or proximity sensors into a single microcontroller ADC or GPIO input. IC Role / Device Role / Timing Role: Low-R_ON, rail-to-rail multiplexer enabling direct sensor connection without external buffering. Use Value: Maintains sensor accuracy by minimizing series resistance and preserving full-scale voltage swing.

FPGA I/O Expansion

Memory Address Multiplexing

Use Scenario: Expanding limited FPGA GPIO count by sharing a single high-speed I/O bank across multiple peripheral devices (e.g., sensors, DACs, UARTs).

IC Role / Device Role / Timing Role: Bidirectional signal router controlled by FPGA GPIOs; provides sub-5ns path selection latency.

Use Value: Eliminates need for additional level translators or discrete switches while preserving signal integrity up to 200MHz.

Use Scenario: Reducing address line count in microcontroller-based systems with multiple SRAM or flash devices sharing a common data bus.

IC Role / Device Role / Timing Role: Low-latency address demultiplexer that selects one memory device's address inputs based on chip-select encoding.

Use Value: Enables 8x memory density scaling without increasing MCU pin count or adding wait states.

Test Equipment Signal Routing

Industrial Sensor Hub Interface

Use Scenario: Automated test fixtures requiring dynamic reconfiguration of signal paths between DUT, instruments, and calibration references.

IC Role / Device Role / Timing Role: High-reliability analog switch matrix with guaranteed power-off isolation and ESD-hardened I/O.

Use Value: Prevents cross-talk and back-driving during hot reconfiguration, supporting unattended 24/7 operation.

Use Scenario: Aggregating analog or digital outputs from eight temperature, pressure, or proximity sensors into a single microcontroller ADC or GPIO input.

IC Role / Device Role / Timing Role: Low-R_ON, rail-to-rail multiplexer enabling direct sensor connection without external buffering.

Use Value: Maintains sensor accuracy by minimizing series resistance and preserving full-scale voltage swing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8:1 multiplexer/demultiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3251PWR	Higher R_ON (7Ω typ), same V_CC range, identical pinout but TI packaging (TSSOP-16).	Marginally higher insertion loss; suitable where 2Ω R_ON advantage is non-critical.	Prefer 74CBTLV3251QG8 when signal integrity below 100mV drop is required at 64mA load.
74LVC1G3157GW	Single-pole double-throw (SPDT), not 8:1; requires 3× units to match functionality.	Not functionally equivalent - lacks integrated 3-bit decode logic and multi-port integration.	Select 74CBTLV3251QG8 for compact, single-chip 8:1 routing; use LVC1G3157 only for simple 2-channel switching.

Compared with SN74CBT3251PWR and 74LVC1G3157GW, the 74CBTLV3251QG8 delivers superior on-resistance, integrated address decoding, and true 8:1 functionality in one QSOP-16 package - reducing component count, layout area, and interconnect parasitics in high-density designs.

Availability

74CBTLV3251QG8 is available at Aetrix Electronics and suitable for FPGA I/O expansion, memory address multiplexing, and industrial sensor hub interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74CBTLV3251QG8 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 74CBTLV3251QG8 belongs to Renesas' legacy IDT logic portfolio, designed specifically for low-voltage, high-speed signal routing in space-constrained industrial and communications systems.

FAQ

What is the maximum continuous current rating for the 74CBTLV3251QG8?

The 74CBTLV3251QG8 supports a maximum continuous channel current of 128mA per switch path, verified under DC conditions with V_CC = 3.3V and ambient temperature ≤85°C. This rating applies to steady-state conduction through any single A–B path; simultaneous activation of multiple paths is not supported and would exceed thermal limits. Always verify PCB trace width and thermal relief design for sustained 100mA+ operation.

Does the 74CBTLV3251QG8 require external pull-up resistors on the OE pin?

Yes - to ensure the 74CBTLV3251QG8 enters a known high-impedance state during power-up or brown-out, OE must be tied to V_CC via an external pull-up resistor. The minimum value depends on the driving source's current-sinking capability; Renesas recommends ≥10kΩ for standard CMOS drivers. Leaving OE floating risks undefined switch states and potential bus contention.

Can the 74CBTLV3251QG8 operate with a 2.5V supply and interface with 3.3V logic signals?

Yes - the 74CBTLV3251QG8 supports V_CC = 2.5V ±0.2V and tolerates input voltages from −0.5V to +4.6V on all I/O pins, including A and B ports. This allows direct connection to 3.3V logic without level shifters, provided signal transitions remain within absolute max ratings and do not exceed V_CC + 0.3V for extended durations.

Is the 74CBTLV3251QG8 pin-compatible with the QS3251 family?

Yes - the 74CBTLV3251QG8 is functionally equivalent to the QS3251 and shares identical pinout, electrical behavior, and timing characteristics in QSOP-16 packaging. Renesas explicitly states functional equivalence in the datasheet, confirming drop-in replacement capability for existing QS3251 designs without layout or firmware changes.

What is the typical on-state resistance variation across voltage and temperature for the 74CBTLV3251QG8?

The 74CBTLV3251QG8 exhibits R_ON = 5Ω typical at V_CC = 3.3V, 25°C, with variation bounded by 5–8Ω across full V_CC (2.3V–3.6V) and temperature (−40°C to +85°C) ranges. At V_CC = 2.5V, R_ON rises to 7Ω max; at 85°C, it increases ~15% versus room temperature - values confirmed in the DC Electrical Characteristics table of the official Renesas datasheet.

74CBTLV3251QG8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 74CBTLV

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Multiplexer/Demultiplexer

Circuit:: 1 x 8:1

Independent Circuits:: 1

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 2.3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

74CBTLV3251QG8 FAQ

1.How can I place an order for 74CBTLV3251QG8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74CBTLV3251QG8 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 74CBTLV3251QG8 reliable?

The price and inventory of 74CBTLV3251QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3251QG8 is usually 5 days.

3.What payment methods are accepted for 74CBTLV3251QG8?

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4.How is shipping managed for 74CBTLV3251QG8?

74CBTLV3251QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74CBTLV3251QG8 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 74CBTLV3251QG8?

For technical support, including 74CBTLV3251QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3251QG8 requirements.

6.How does Aetrix verify that 74CBTLV3251QG8 is sourced from the original manufacturer or authorized distributors?

All 74CBTLV3251QG8 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 74CBTLV3251QG8 meets industry standards.

7.What is the process for return or replacement of 74CBTLV3251QG8?

All 74CBTLV3251QG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3251QG8, 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 74CBTLV3251QG8 part is unused and in its original packaging.

Return procedure for 74CBTLV3251QG8:

1.Submit a request within 90 days.

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

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