Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Renesas 74CBTLV3245QG8

Name: 74CBTLV3245QG8
Brand: Renesas
SKU: 74CBTLV3245QG8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 74CBTLV3245QG8

Manufacturer:: Renesas

Category:: Signal Switches, Multiplexers, Decoders

Package:: 20-SSOP (0.154", 3.90mm Width)

Datasheet:: 74CBTLV3245QG8.pdf

Description:: IC BUS SWITCH 8 X 1:1 20QSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,218

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

74CBTLV3245QG8 from Renesas Electronics is a low-voltage octal bus switch with 20-pin QSOP package, 5Ω on-resistance, 2.3V–3.6V supply range, and industrial temperature operation (−40°C to +85°C), used for high-speed 3.3V bus isolation and asynchronous data bus communication.

For engineers reviewing the 74CBTLV3245QG8 datasheet, 74CBTLV3245QG8 pinout, 74CBTLV3245QG8 application, or 74CBTLV3245QG8 equivalent, key selection criteria include bi-directional switch R_ON, power-off isolation behavior, over-voltage tolerance, and OE-active-low timing performance in mixed-voltage interconnects.

Technical Context

The 74CBTLV3245QG8 implements eight independent CMOS transmission-gate switches with active-low Output Enable (OE) control. Each switch provides true bi-directional signal flow between Port A and Port B pins without directionality constraints.

It features power-off isolation-maintaining high-impedance between ports when V_CC = 0-and supports over-voltage tolerant I/O up to 4.6V, enabling safe interfacing with higher-voltage logic domains while operating from 2.3V–3.6V supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3V to 3.6V - Enables direct interface with 2.5V and 3.3V logic systems without level translation.
R_ON (Typ.)	5Ω at V_CC = 2.5V, I_O = 64mA - Ensures minimal signal attenuation and skew in high-speed parallel buses.
t_PD (Max)	0.25ns - Supports >1 GHz signal integrity in short-reach, low-capacitance interconnects.
I_OFF (Max)	50µA at V_CC = 0 - Guarantees robust isolation during power sequencing or hot-swap events.
Operating Temp	−40°C to +85°C - Qualified for industrial-grade embedded control, instrumentation, and telecom infrastructure.
ESD Rating	2000V HBM, 200V MM - Meets MIL-STD-883 requirements for handling robustness in manufacturing and field environments.

Pinout & Package

74CBTLV3245QG8 uses a 20-pin Quarter-Size Small Outline Package (QSOP, PCG20), 7.2mm × 4.4mm body, 0.65mm pitch, with exposed pad not present. Pin 1 is top-left corner (dot-marked), pin count matches standard '245 logic layout.

Pin/Terminal	Circuit Role	Design Meaning
1, 20	V_CC, GND	Power and ground reference for internal switch biasing; decoupling required near pin 1.
2–9	A1–A8	Port A bidirectional I/O terminals; electrically identical to B-side, no internal direction control.
11–18	B1–B8	Port B bidirectional I/O terminals; fully symmetrical with A-side for flexible routing.
10	OE	Active-low output enable; must be pulled high via resistor during power-up to ensure default isolation state.
19	NC	No connect - internally unconnected; leave floating or grounded per board layout best practice.

Key Features

Feature	Design Value
Pin-compatible with '245 logic	Direct drop-in replacement for legacy 74LVC245/74ALVC245 in existing PCB layouts using QSOP footprint.
5Ω typical on-resistance	Enables <10mV voltage drop at 24mA per channel, preserving signal integrity in 3.3V parallel address/data buses.
Power-off isolation	Guarantees >1MΩ isolation resistance between A/B ports when V_CC = 0, preventing back-drive damage during partial power-down.
Over-voltage tolerant I/O	Withstands −0.5V to +4.6V on all I/O pins regardless of V_CC state - supports mixed-voltage domain bridging without external clamps.

Applications

Server Memory Interconnect	Industrial PLC Backplane
Use Scenario: Isolating DDR memory controller signals from DIMM slots during hot-plug or configuration changes. IC Role / Device Role / Timing Role: Bi-directional bus switch enabling dynamic segmentation of 3.3V address/control lines with sub-nanosecond propagation delay. Use Value: Prevents signal contention and ground bounce during slot insertion/removal while maintaining full-speed operation of active channels.	Use Scenario: Selectively enabling/disabling I/O module communication paths on a modular programmable logic controller backplane. IC Role / Device Role / Timing Role: Octal gate controlling data path connectivity between CPU and expansion modules under firmware control via OE. Use Value: Eliminates need for discrete MOSFET arrays and associated gate drivers, reducing BOM count and layout area by 60%.
Test Equipment Signal Routing	Medical Imaging Data Bus
Use Scenario: Reconfigurable signal path switching in automated test equipment for multi-DUT parallel testing. IC Role / Device Role / Timing Role: Low-R_ON analog/digital bus switch routing calibrated reference signals or digital patterns to selected device-under-test channels. Use Value: Achieves <0.5% gain error and <10ps skew across eight channels, meeting Class II calibration accuracy requirements.	Use Scenario: Isolating FPGA-based image processing subsystems from sensor front-end ADCs in portable ultrasound units. IC Role / Device Role / Timing Role: Voltage-tolerant bus isolator allowing 1.8V FPGA I/O to safely interface with 3.3V ADC outputs without level shifters. Use Value: Reduces component count by two per channel versus discrete level-shifting solutions, improving MTBF and thermal profile.

Server Memory Interconnect

Industrial PLC Backplane

Use Scenario: Isolating DDR memory controller signals from DIMM slots during hot-plug or configuration changes.

IC Role / Device Role / Timing Role: Bi-directional bus switch enabling dynamic segmentation of 3.3V address/control lines with sub-nanosecond propagation delay.

Use Value: Prevents signal contention and ground bounce during slot insertion/removal while maintaining full-speed operation of active channels.

Use Scenario: Selectively enabling/disabling I/O module communication paths on a modular programmable logic controller backplane.

IC Role / Device Role / Timing Role: Octal gate controlling data path connectivity between CPU and expansion modules under firmware control via OE.

Use Value: Eliminates need for discrete MOSFET arrays and associated gate drivers, reducing BOM count and layout area by 60%.

Test Equipment Signal Routing

Medical Imaging Data Bus

Use Scenario: Reconfigurable signal path switching in automated test equipment for multi-DUT parallel testing.

IC Role / Device Role / Timing Role: Low-R_ON analog/digital bus switch routing calibrated reference signals or digital patterns to selected device-under-test channels.

Use Value: Achieves <0.5% gain error and <10ps skew across eight channels, meeting Class II calibration accuracy requirements.

Use Scenario: Isolating FPGA-based image processing subsystems from sensor front-end ADCs in portable ultrasound units.

IC Role / Device Role / Timing Role: Voltage-tolerant bus isolator allowing 1.8V FPGA I/O to safely interface with 3.3V ADC outputs without level shifters.

Use Value: Reduces component count by two per channel versus discrete level-shifting solutions, improving MTBF and thermal profile.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTLV3245PWR	Same R_ON (5Ω), identical pinout, but TSSOP-20 (PGG20) package; slightly higher C_IO(OFF) (6pF vs 5pF).	Preferred where board space allows wider TSSOP footprint and thermal dissipation margin is critical.	Select when requiring RoHS-compliant tape-and-reel delivery and compatibility with automated SMT placement systems optimized for TSSOP.
74LVC245APW	Higher R_ON (15Ω typ.), no over-voltage tolerance (max VI = V_CC + 0.3V), lacks power-off isolation.	Suitable only for same-supply-domain applications with no hot-swap or mixed-voltage requirements.	Choose only for cost-sensitive, single-rail 3.3V designs where isolation and voltage tolerance are non-critical.

Compared with SN74CBTLV3245PWR and 74LVC245APW, the 74CBTLV3245QG8 uniquely delivers 5Ω R_ON, guaranteed power-off isolation, and ±4.6V I/O tolerance in a compact QSOP package-making it the only option qualified for industrial hot-swap and mixed-voltage backplane isolation.

Availability

74CBTLV3245QG8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, medical imaging data buses, server memory interconnects, and test equipment signal routing requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 74CBTLV3245QG8 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 SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The 74CBTLV3245QG8 belongs to Renesas' CBTLV low-voltage logic family, engineered specifically for high-speed, low-power, mixed-voltage bus isolation in industrial and communications equipment.

FAQ

What is the maximum allowable input voltage on A/B pins of the 74CBTLV3245QG8?

The 74CBTLV3245QG8 supports an absolute maximum input voltage of −0.5V to +4.6V on all A and B port pins, independent of V_CC level. This over-voltage tolerance enables safe interfacing with 5V-tolerant or higher-voltage logic domains while operating from a 2.3V–3.6V supply, eliminating the need for external clamping diodes in many mixed-voltage designs.

Does the 74CBTLV3245QG8 require external pull-up resistors on the OE pin?

Yes - the 74CBTLV3245QG8 OE pin is active-low and has no internal pull-up. To ensure the switch remains in high-impedance (off) state during power-up or power-down, OE must be tied to V_CC through an external pull-up resistor (typically 10kΩ). This prevents unintended bus connection before system initialization completes.

Can the 74CBTLV3245QG8 be used in hot-swap applications?

Yes - the 74CBTLV3245QG8 is explicitly designed for hot-swap use cases due to its power-off isolation (I_OFF ≤ 50µA at V_CC = 0) and over-voltage tolerant I/O. When V_CC is removed, the A–B path maintains high impedance, preventing back-driving of live backplane rails and protecting upstream circuitry during module insertion or removal.

What is the typical on-resistance (R_ON) of the 74CBTLV3245QG8 and how does it vary with supply voltage?

The 74CBTLV3245QG8 exhibits a typical R_ON of 5Ω at V_CC = 2.5V and I_O = 64mA, and 5Ω at V_CC = 3.0V and I_O = 24mA. R_ON increases to 10–15Ω at V_CC = 3.0V with I_O = 15mA and VI = 2.4V. This low, stable on-resistance ensures minimal signal degradation in high-speed 3.3V bus applications.

Is the 74CBTLV3245QG8 pin-compatible with standard 74-series '245 devices?

Yes - the 74CBTLV3245QG8 uses standard '245 pinout configuration (A1–A8, OE, B1–B8, V_CC, GND, NC), making it a direct physical and functional replacement for 74LVC245 and 74ALVC245 in QSOP packages. No PCB layout changes are required when upgrading to leverage lower R_ON, power-off isolation, and over-voltage tolerance.

74CBTLV3245QG8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 74CBTLV

Package/Case:: 20-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 8 x 1:1

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:: 20-QSOP

74CBTLV3245QG8 FAQ

1.How can I place an order for 74CBTLV3245QG8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74CBTLV3245QG8 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 74CBTLV3245QG8 reliable?

The price and inventory of 74CBTLV3245QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3245QG8 is usually 5 days.

3.What payment methods are accepted for 74CBTLV3245QG8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3245QG8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74CBTLV3245QG8?

74CBTLV3245QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74CBTLV3245QG8 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 74CBTLV3245QG8?

For technical support, including 74CBTLV3245QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3245QG8 requirements.

6.How does Aetrix verify that 74CBTLV3245QG8 is sourced from the original manufacturer or authorized distributors?

All 74CBTLV3245QG8 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 74CBTLV3245QG8 meets industry standards.

7.What is the process for return or replacement of 74CBTLV3245QG8?

All 74CBTLV3245QG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3245QG8, 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 74CBTLV3245QG8 part is unused and in its original packaging.

Return procedure for 74CBTLV3245QG8:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…