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

Renesas QS3253S1G8

Name: QS3253S1G8
Brand: Renesas
SKU: QS3253S1G8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: QS3253S1G8

Manufacturer:: Renesas

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: QS3253S1G8.pdf

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

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Product details

Overview

QS3253S1G8 from Renesas Electronics is a high-speed CMOS dual 4:1 multiplexer/demultiplexer with TTL-compatible control inputs, 5Ω typical ON resistance, zero propagation delay, and industrial temperature range (–40°C to +85°C). It serves as a bidirectional logic-level switch for video/audio routing, bus funneling, and voltage translation between 5V and 3.3V domains.

For engineers reviewing the QS3253S1G8 datasheet, QS3253S1G8 pinout, QS3253S1G8 application, or QS3253S1G8 equivalent, key selection criteria include its 5Ω ON resistance, 0.25ns max propagation delay, Hi-Z 3-state outputs, undershoot clamp diodes on all I/O, and compatibility with 74F253/74FCT253 logic families.

Technical Context

The QS3253S1G8 implements two independent 4:1 analog/digital multiplexers using enhanced N-channel FETs with no inherent body diode to V_CC, enabling true bidirectional signal flow without DC path constraints. Each channel features separate enable (EA/EB) and dual-bit select (S1/S0) controls, supporting simultaneous or independent mux/demux operation.

Its architecture eliminates ground bounce and propagation delay by relying solely on resistive-capacitive switching behavior - t_PLH/t_PHL ≤ 0.25ns is limited only by external load (C_L = 50pF, R_L = 500Ω), not internal logic gates. Input clamping diodes and TTL-compatible thresholds (V_IL ≤ 0.8V, V_VIH ≥ 2.0V) ensure robust interfacing with legacy logic families.

Key Specifications

Parameter	Value and Actual Design Meaning
ON Resistance	5Ω typical at V_CC = 5V, enabling low-loss analog/digital signal pass-through with minimal RC delay
Propagation Delay	≤ 0.25ns max (Ix→Y), effectively zero system-level delay when driving 50pF loads
Operating Temperature	–40°C to +85°C industrial range, validated for embedded control and industrial automation
Supply Voltage	5.0V ±5%, compatible with standard TTL/CMOS logic rails
Input Compatibility	TTL-compatible control inputs (V_IL ≤ 0.8V, V_VIH ≥ 2.0V), interoperable with 74F/74FCT/74ALS families
Output Type	3-state Hi-Z outputs (YA/YB), allowing bus sharing and dynamic signal isolation
Clamp Diodes	Integrated undershoot clamp diodes on all switch and control inputs, protecting against negative transients

Pinout & Package

QS3253S1G8 is housed in a 16-pin Small Outline IC (S1) package - RoHS-compliant, green, surface-mount, 3.9mm × 9.9mm body size, 1.27mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
EA, EB	Active-Low Enable Inputs	Disable respective mux channels to Hi-Z; both must be LOW for functional operation
S0, S1	Binary Select Inputs	Choose one of four input pairs (I0A–I3A / I0B–I3B) to route to YA/YB
I0A–I3A, I0B–I3B	Bidirectional Data Terminals	Pass signals in either direction with 5Ω R_ON; no polarity restriction
YA, YB	3-State Output Terminals	Driven outputs when EA/EB = LOW; Hi-Z when disabled
V_CC, GND	Power Supply Pins	Single 5V supply; no separate analog/digital rails required

Key Features

Feature	Design Value
Zero Propagation Delay Architecture	Eliminates gate-based timing skew; delay determined only by R_ON·C_L, not internal logic stages
Enhanced N-Channel FET Switch	No intrinsic source-to-drain diode, enabling true bidirectional AC/DC signal routing without V_CC path constraints
Undershoot Clamp Diodes	Protects all switch and control pins from –3V transient undershoot, critical for hot-swap and docking interfaces
Pin Compatibility	Direct replacement for 74F253, 74FCT253, and 74ALS/AS/LS253 in existing PCB layouts
Low Quiescent Current	ICCQ ≤ 3μA at V_CC = 5.25V, supporting power-sensitive industrial and portable applications

Applications

Video Signal Routing	Industrial Bus Funneling
Use Scenario: Switching multiple camera or display sources to a single processor interface in machine vision systems. IC Role / Device Role / Timing Role: Dual 4:1 analog mux providing lossless, low-latency video path selection with no added jitter or skew. Use Value: 5Ω R_ON preserves signal integrity up to 100MHz; zero propagation delay avoids frame sync misalignment.	Use Scenario: Consolidating multiple sensor or actuator buses onto a central controller in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional bus funnel enabling time-multiplexed access to shared I/O resources without protocol overhead. Use Value: Hi-Z outputs and fast turn-on/off (t_PZL/t_PLZ ≤ 6ns) allow microsecond-scale bus arbitration.
Hot-Swappable Docking Station	Voltage-Level Translation
Use Scenario: Enabling safe insertion/removal of peripheral modules in laptop docking stations without disrupting host logic. IC Role / Device Role / Timing Role: Isolation switch with undershoot clamps and controlled enable sequencing to suppress insertion transients. Use Value: Integrated clamp diodes withstand –3V undershoot; EA/EB enables staggered power-up to prevent backdrive.	Use Scenario: Interfacing 5V legacy controllers with 3.3V FPGA or microcontroller peripherals in mixed-voltage systems. IC Role / Device Role / Timing Role: Passive level translator leveraging bidirectional conduction and rail-independent R_ON. Use Value: Supports 5V ↔ 3.3V translation without external biasing; V_IN range (–0.5V to +7V) accommodates overvoltage tolerance.

Video Signal Routing

Industrial Bus Funneling

Use Scenario: Switching multiple camera or display sources to a single processor interface in machine vision systems.

IC Role / Device Role / Timing Role: Dual 4:1 analog mux providing lossless, low-latency video path selection with no added jitter or skew.

Use Value: 5Ω R_ON preserves signal integrity up to 100MHz; zero propagation delay avoids frame sync misalignment.

Use Scenario: Consolidating multiple sensor or actuator buses onto a central controller in factory automation PLCs.

IC Role / Device Role / Timing Role: Bidirectional bus funnel enabling time-multiplexed access to shared I/O resources without protocol overhead.

Use Value: Hi-Z outputs and fast turn-on/off (t_PZL/t_PLZ ≤ 6ns) allow microsecond-scale bus arbitration.

Hot-Swappable Docking Station

Voltage-Level Translation

Use Scenario: Enabling safe insertion/removal of peripheral modules in laptop docking stations without disrupting host logic.

IC Role / Device Role / Timing Role: Isolation switch with undershoot clamps and controlled enable sequencing to suppress insertion transients.

Use Value: Integrated clamp diodes withstand –3V undershoot; EA/EB enables staggered power-up to prevent backdrive.

Use Scenario: Interfacing 5V legacy controllers with 3.3V FPGA or microcontroller peripherals in mixed-voltage systems.

IC Role / Device Role / Timing Role: Passive level translator leveraging bidirectional conduction and rail-independent R_ON.

Use Value: Supports 5V ↔ 3.3V translation without external biasing; V_IN range (–0.5V to +7V) accommodates overvoltage tolerance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4:1 mux/demux applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74FCT253SOG	Higher ON resistance (15Ω typ), slower t_PLH (3.5ns), no undershoot clamps	Limited to static logic-level muxing; unsuitable for hot-swap or analog signal routing	Select when cost is primary and transient immunity is not required
SN74CBT3253PWR	Lower V_CC range (4.5–5.5V), identical R_ON (5Ω), but lacks industrial temp rating (0°C to +70°C only)	Not qualified for extended temperature environments such as motor drives or outdoor equipment	Select for commercial-grade applications where full industrial range is unnecessary

Compared with 74FCT253SOG and SN74CBT3253PWR, the QS3253S1G8 uniquely combines industrial temperature support, undershoot protection, and sub-nanosecond delay - making it the only option qualified for ruggedized hot-swap and mixed-signal routing in harsh environments.

Availability

QS3253S1G8 is available at Aetrix Electronics and suitable for video signal routing, industrial bus funneling, and hot-swappable docking station designs requiring stable component supply across extended temperature and long product lifecycles.

Supply support for QS3253S1G8 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 QS3253S1G8 belongs to Renesas' QUICKSWITCH® high-speed bus switch family, engineered specifically for low-latency, bidirectional signal routing in mixed-voltage, hot-plug, and real-time industrial systems.

FAQ

What is the maximum signal frequency supported by the QS3253S1G8?

The QS3253S1G8 does not specify a hard bandwidth limit, but its 5Ω ON resistance and typical channel capacitance (7pF for demux OFF state) yield an RC time constant < 0.25ns - supporting clean signal transmission up to ~100MHz for video and digital bus applications. System-level bandwidth depends on external load and drive strength, not internal logic.

Does the QS3253S1G8 require external pull-up or pull-down resistors on control pins?

No. The QS3253S1G8 has TTL-compatible inputs with guaranteed VIH ≥ 2.0V and VIL ≤ 0.8V, and input leakage current ≤ ±1μA. Control pins (EA, EB, S0, S1) can be driven directly from standard logic outputs without external biasing components.

Can the QS3253S1G8 be used for analog signal switching, such as audio or sensor outputs?

Yes. The QS3253S1G8's 5Ω R_ON, flat frequency response, and absence of body diodes make it suitable for bidirectional analog signal routing - including line-level audio, thermocouple outputs, and low-frequency sensor signals - provided V_IN remains within –0.5V to +7V and load current stays below 120mA per channel.

Is the QS3253S1G8 pin-compatible with the original IDT version?

Yes. The QS3253S1G8 retains the same 16-pin S1 package, pinout, electrical specifications, and functional behavior as the original IDT QS3253, following Renesas' acquisition of IDT. No PCB or firmware changes are needed for drop-in replacement.

What is the purpose of the undershoot clamp diodes in the QS3253S1G8?

The undershoot clamp diodes on all switch and control inputs protect the QS3253S1G8 from negative voltage transients down to –3V during hot-insertion or cable disconnect events. This feature prevents latch-up and ensures reliable operation in docking stations, modular test equipment, and field-replaceable industrial modules.

QS3253S1G8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Multiplexer/Demultiplexer

Circuit:: 2 x 4:1

Independent Circuits:: 1

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:: 16-SOIC

QS3253S1G8 FAQ

1.How can I place an order for QS3253S1G8 through Aetrix?

Please submit a Request for Quotation (RFQ) for QS3253S1G8 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 QS3253S1G8 reliable?

The price and inventory of QS3253S1G8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3253S1G8 is usually 5 days.

3.What payment methods are accepted for QS3253S1G8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3253S1G8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for QS3253S1G8?

QS3253S1G8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your QS3253S1G8 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 QS3253S1G8?

For technical support, including QS3253S1G8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3253S1G8 requirements.

6.How does Aetrix verify that QS3253S1G8 is sourced from the original manufacturer or authorized distributors?

All QS3253S1G8 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 QS3253S1G8 meets industry standards.

7.What is the process for return or replacement of QS3253S1G8?

All QS3253S1G8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3253S1G8, 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 QS3253S1G8 part is unused and in its original packaging.

Return procedure for QS3253S1G8:

1.Submit a request within 90 days.

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

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