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

Renesas QS34X2245Q3G8

Name: QS34X2245Q3G8
Brand: Renesas
SKU: QS34X2245Q3G8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: QS34X2245Q3G8

Manufacturer:: Renesas

Category:: Signal Switches, Multiplexers, Decoders

Package:: 80-FSOP (0.154", 3.90mm Width)

Datasheet:: QS34X2245Q3G8.pdf

Description:: IC BUS SWITCH 8 X 1:1 80QVSOP

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Product details

Overview

QS34X2245Q3G8 from Renesas Electronics (formerly IDT) is a 32-bit high-speed CMOS bus switch with flow-through pinout, 23Ω typical ON-resistance at 5V, zero propagation delay, and industrial temperature range (–40°C to +85°C). It enables bidirectional signal routing between two 32-bit buses for hot-swap-capable server backplanes.

For engineers reviewing the QS34X2245Q3G8 datasheet, QS34X2245Q3G8 pinout, QS34X2245Q3G8 application, or QS34X2245Q3G8 equivalent, key selection criteria include its 1.25ns max propagation delay, 25Ω internal termination resistors, TTL-compatible control inputs, and 80-pin MilliPaQ™ package for dense PCB layouts.

Technical Context

The QS34X2245Q3G8 implements 32 independent N-channel FET switches without inherent body diodes to V_CC, enabling true bidirectional signal flow with no DC path. Each switch is controlled by one of four OE inputs (OE1–OE4), allowing segmented 8-bit enable control across the 32-bit width.

It operates at 5.0V ±5%, supports voltage translation between 5V and 3.3V domains, and uses internal 25Ω resistors to damp reflection noise in high-speed parallel bus applications up to 200+ MHz. Undershoot clamp diodes protect all A/B and control pins against negative transients.

Key Specifications

Parameter	Value and Actual Design Meaning
ON Resistance (R_ON)	23 Ω typical at V_CC = 5V, VIN = 0V - ensures minimal voltage drop and signal integrity during active switching
Propagation Delay (t_PLH/t_PHL)	≤1.25 ns max - contributes negligible timing overhead in high-speed data paths
Switch Turn-on Delay (t_PZL)	6.6 ns max - defines minimum OE assertion-to-data-valid window for synchronous control
Input Voltage Levels	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - guarantees compatibility with TTL and 3.3V/5V logic families
Operating Temperature	–40°C to +85°C - validated for industrial and telecom infrastructure environments
Supply Voltage (V_CC)	5.0 V ±5% - fixed single-supply operation; no dual-rail or level-shifting circuitry required
Package	80-pin MilliPaQ™ - compact surface-mount footprint optimized for 32-bit bus density and thermal dissipation

Pinout & Package

QS34X2245Q3G8 is housed in an 80-pin MilliPaQ™ package - a fine-pitch, thermally enhanced, lead-free surface-mount solution with exposed thermal pad. Pin layout follows flow-through topology to minimize trace length and crosstalk in parallel bus routing.

Pin/Terminal	Circuit Role	Design Meaning
OEn (OE1–OE4)	Active-low switch enable	Four independent enables control eight-bit segments (A0–A7/B0–B7, etc.), enabling partial bus isolation
An (A0–A31)	Input/Output port A	Bidirectional I/O terminal; connects to upstream bus or controller side
Bn (B0–B31)	Input/Output port B	Bidirectional I/O terminal; connects to downstream bus or peripheral side
V_CC	Power supply	Single 5V supply for all switch channels and control logic; no separate I/O rail needed
GND	Ground reference	Multiple ground pins distributed across package for low-inductance return paths and noise suppression

Key Features

Feature	Design Value
Zero propagation delay architecture	Eliminates added timing skew in critical data paths-propagation governed only by external RC load, not internal logic
Enhanced N-channel FETs without body diode	Prevents unintended current flow to V_CC during hot-insertion, enabling safe live-backplane operation
Integrated 25Ω termination resistors	Reduces signal reflections on stubbed or unterminated buses without requiring external components
Undershoot clamp diodes on all I/Os	Protects against –3V transient excursions on A/B and control pins, meeting IEC 61000-4-2 ESD robustness requirements
Flow-through pinout	Allows straight-line PCB trace routing between A and B ports, minimizing layer count and impedance discontinuities

Applications

Hot-Swappable Server Backplane	Voltage-Translated Memory Interface
Use Scenario: Inserting/removing PCIe or memory modules while system remains powered. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating module-side signals from main backplane during insertion. Use Value: Prevents bus contention and ground bounce during hot-plug events using zero-delay switching and undershoot clamps.	Use Scenario: Interfacing 5V legacy controllers with 3.3V DDR SDRAM subsystems. IC Role / Device Role / Timing Role: Level-translating, direction-agnostic data path between mismatched voltage domains. Use Value: Enables seamless 5V↔3.3V translation without external biasing or direction control logic.
Low-Power Peripheral Isolation	High-Speed Clock Gating
Use Scenario: Disabling unused USB or SATA PHYs in portable baseband processors. IC Role / Device Role / Timing Role: Power-gated signal bridge that cuts leakage current when peripherals are idle. Use Value: Reduces standby power by >95% per isolated 32-bit lane via high-impedance OFF-state (±1 μA IOZ).	Use Scenario: Dynamically enabling/disabling clock distribution to CPU cores or GPU clusters. IC Role / Device Role / Timing Role: Low-skew, glitch-free clock path selector with sub-7ns turn-on/turn-off. Use Value: Achieves precise clock gating with <1.25ns delay variation-critical for DVFS and power-state transitions.

Hot-Swappable Server Backplane

Voltage-Translated Memory Interface

Use Scenario: Inserting/removing PCIe or memory modules while system remains powered.

IC Role / Device Role / Timing Role: Bidirectional bus switch isolating module-side signals from main backplane during insertion.

Use Value: Prevents bus contention and ground bounce during hot-plug events using zero-delay switching and undershoot clamps.

Use Scenario: Interfacing 5V legacy controllers with 3.3V DDR SDRAM subsystems.

IC Role / Device Role / Timing Role: Level-translating, direction-agnostic data path between mismatched voltage domains.

Use Value: Enables seamless 5V↔3.3V translation without external biasing or direction control logic.

Low-Power Peripheral Isolation

High-Speed Clock Gating

Use Scenario: Disabling unused USB or SATA PHYs in portable baseband processors.

IC Role / Device Role / Timing Role: Power-gated signal bridge that cuts leakage current when peripherals are idle.

Use Value: Reduces standby power by >95% per isolated 32-bit lane via high-impedance OFF-state (±1 μA IOZ).

Use Scenario: Dynamically enabling/disabling clock distribution to CPU cores or GPU clusters.

IC Role / Device Role / Timing Role: Low-skew, glitch-free clock path selector with sub-7ns turn-on/turn-off.

Use Value: Achieves precise clock gating with <1.25ns delay variation-critical for DVFS and power-state transitions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3245APWR	32-bit FET bus switch, 5V-only, 6Ω R_ON, TSSOP-56 package	Higher density but lower noise immunity; lacks undershoot clamps and internal 25Ω termination	Preferred for cost-sensitive, space-constrained consumer designs where ESD robustness is secondary
PI3CH400QE	32-bit bus switch, 3.3V/5V tolerant, 10Ω R_ON, QFN-64 package	Supports mixed-voltage I/O but requires external termination; no OE segmentation (single enable)	Chosen when multi-voltage domain support and smaller footprint outweigh need for segmented enable control

Compared with SN74CBT3245APWR and PI3CH400QE, the QS34X2245Q3G8 uniquely combines segmented OE control, integrated 25Ω termination, and industrial-grade undershoot protection-making it optimal for mission-critical hot-swap and telecom infrastructure designs.

Availability

QS34X2245Q3G8 is available at Aetrix Electronics and suitable for hot-swappable server backplanes, voltage-translated memory interfaces, and low-power peripheral isolation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for QS34X2245Q3G8 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, and infrastructure markets.

The QS34X2245Q3G8 belongs to Renesas' legacy QuickSwitch® bus switch portfolio-designed specifically for high-speed, low-noise, hot-pluggable interconnect in enterprise computing and communications systems.

FAQ

What is the maximum operating frequency supported by QS34X2245Q3G8?

The QS34X2245Q3G8 does not specify a maximum clock frequency because it is a passive analog switch-not a clocked device. Its bandwidth is determined by R_ON and load capacitance: with 23Ω R_ON and 50pF load, the RC time constant is ~1.25ns, supporting clean signal transmission up to 200+ MHz in well-terminated systems. System-level bandwidth depends on PCB layout and termination.

Does QS34X2245Q3G8 support 3.3V-only operation?

No, QS34X2245Q3G8 is specified for 5.0V ±5% operation only. It is not rated for 3.3V supply; attempting to operate below 4.75V violates the Absolute Maximum Ratings and may result in unreliable switching or increased R_ON. For 3.3V systems, consider voltage-translating alternatives like PI3CH400QE.

How many independent enable controls does QS34X2245Q3G8 provide?

QS34X2245Q3G8 provides four independent active-low Output Enable inputs: OE1, OE2, OE3, and OE4. Each controls a distinct 8-bit segment (e.g., OE1 controls A0–A7/B0–B7), allowing granular isolation of subsections of the 32-bit bus without affecting other lanes.

Is QS34X2245Q3G8 RoHS-compliant and lead-free?

Yes, QS34X2245Q3G8 is RoHS-compliant and manufactured in a lead-free process. The "Q3G" in the part number denotes the 80-pin MilliPaQ™ green (lead-free) package, confirmed in the Ordering Information section of the datasheet revision dated August 2012.

Can QS34X2245Q3G8 be used for analog signal switching?

QS34X2245Q3G8 is characterized and qualified only for digital bus switching applications. While its FET structure permits analog pass-through, it lacks guaranteed parameters for analog performance (e.g., THD, flatness, channel-to-channel crosstalk). For analog signals, use purpose-built analog switches such as the ADG1436 or MAX4617 instead of QS34X2245Q3G8.

QS34X2245Q3G8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 34X

Package/Case:: 80-FSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 8 x 1:1

Independent Circuits:: 4

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 80-QVSOP

QS34X2245Q3G8 FAQ

1.How can I place an order for QS34X2245Q3G8 through Aetrix?

Please submit a Request for Quotation (RFQ) for QS34X2245Q3G8 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 QS34X2245Q3G8 reliable?

The price and inventory of QS34X2245Q3G8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS34X2245Q3G8 is usually 5 days.

3.What payment methods are accepted for QS34X2245Q3G8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS34X2245Q3G8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for QS34X2245Q3G8?

QS34X2245Q3G8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your QS34X2245Q3G8 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 QS34X2245Q3G8?

For technical support, including QS34X2245Q3G8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS34X2245Q3G8 requirements.

6.How does Aetrix verify that QS34X2245Q3G8 is sourced from the original manufacturer or authorized distributors?

All QS34X2245Q3G8 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 QS34X2245Q3G8 meets industry standards.

7.What is the process for return or replacement of QS34X2245Q3G8?

All QS34X2245Q3G8 units undergo pre-shipment inspection (PSI). If there is an issue with QS34X2245Q3G8, 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 QS34X2245Q3G8 part is unused and in its original packaging.

Return procedure for QS34X2245Q3G8:

1.Submit a request within 90 days.

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

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