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

Renesas QS3VH257S1G8

Name: QS3VH257S1G8
Brand: Renesas
SKU: QS3VH257S1G8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: QS3VH257S1G8

Manufacturer:: Renesas

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: QS3VH257S1G8.pdf

Description:: IC BUS SWITCH 4 X 2:1 16SOIC

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Product details

Overview

QS3VH257S1G8 from Renesas Electronics (formerly IDT) is a 2.5V/3.3V quad 2:1 multiplexer/demultiplexer bus switch with N-channel FET architecture, 4 Ω typical ON resistance, <0.2 ns propagation delay, and 5 V-tolerant I/Os. It operates from –40°C to +85°C and supports rail-to-rail analog switching in hot-swap and high-speed communication backplanes.

For engineers reviewing the QS3VH257S1G8 datasheet, QS3VH257S1G8 pinout, QS3VH257S1G8 application, or QS3VH257S1G8 equivalent, key selection criteria include 5 V tolerance under power-off conditions, LVTTL-compatible control inputs, sub-250 ps signal path delay, and SOIC-16 green package compatibility for industrial PCB layouts.

Technical Context

The QS3VH257S1G8 implements four independent bidirectional 2:1 analog switches controlled by a shared active-low Enable (E) and common Select (S) input. Each channel exhibits flat R_ON across 0–5 V input range and no parasitic diode to V_CC, enabling true isolation during power-down.

Its architecture delivers high bandwidth (up to 500 MHz), low I/O capacitance (4 pF typical), and undershoot clamp diodes on all switch and control pins - critical for signal integrity in live-insertion systems and ATM 25/155 switching nodes where ground bounce and voltage overshoot must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3 V to 3.6 V - supports dual-supply 2.5 V and 3.3 V logic domains without level shifters
R_ON (Typ.)	4 Ω at V_CC = 3 V - enables minimal insertion loss and distortion in analog signal paths
Propagation Delay	<0.2 ns - contributes negligible timing skew in high-speed data routing
I/O Voltage Tolerance	–0.5 V to +5.5 V - allows safe interfacing with 5 V signals even when V_CC = 2.5 V or powered off
Bandwidth	Up to 500 MHz - suitable for DDR clock distribution and serial data multiplexing
Operating Temp	–40°C to +85°C - qualified for industrial-grade embedded and telecom equipment
I/O Capacitance	4 pF typical - reduces loading on driving sources and preserves edge rates

Pinout & Package

QS3VH257S1G8 is packaged in a 16-pin SOIC (Small Outline Integrated Circuit) green RoHS-compliant package (S1G suffix), with 1.27 mm pitch and standard JEDEC MS-012AC footprint.

Pin/Terminal	Circuit Role	Design Meaning
I0A–I0D	Data Input A–D (Channel 0)	Bidirectional analog/digital inputs for first source of each 2:1 mux
I1A–I1D	Data Input A–D (Channel 1)	Bidirectional analog/digital inputs for second source of each 2:1 mux
YA–YD	Data Output A–D	Common output terminals per channel; fully bidirectional signal path
S	Select Input	LVTTL-compatible control; selects I0x (S = L) or I1x (S = H) for all channels
E	Enable Input	Active-low; disables all switches (Hi-Z) when E = H
V_CC	Supply Voltage	2.3–3.6 V digital supply; powers internal logic and gate drive only
GND	Ground Reference	Common return for control logic and switch substrate bias

Key Features

Feature	Design Value
N-channel FET switches with no parasitic diode to V_CC	Enables true isolation during power-off; eliminates DC leakage paths to supply rails
Rail-to-rail switching (0–5 V)	Supports full-swing analog signals without clipping or distortion across entire range
Undershoot clamp diodes on all pins	Prevents negative transients below –0.5 V from damaging internal structures
Low and matched R_ON (4 Ω typ., ±1 Ω matching)	Ensures consistent signal attenuation and phase response across all four channels
LVTTL-compatible control inputs	Direct interface with legacy 3.3 V microcontrollers and FPGAs without external translators

Applications

Hot-Swappable Backplane Interface	ATM 25/155 Cell Switching
Use Scenario: Live insertion/removal of line cards in telecom chassis without system reset or data corruption. IC Role / Device Role / Timing Role: Bidirectional signal path isolator and voltage-level agnostic bus switch between card-edge connector and backplane ASIC. Use Value: 5 V tolerance and zero-power isolation prevent bus contention and latch-up during plug events.	Use Scenario: Time-division multiplexing of multiple ATM streams onto shared physical layer links. IC Role / Device Role / Timing Role: Low-latency, low-distortion 2:1 analog/digital MUX/DEMUX for cell header and payload routing. Use Value: Sub-0.2 ns propagation delay and 500 MHz bandwidth preserve cell timing integrity and jitter margins.
Low-Distortion Analog Multiplexing	Relay Replacement in Test Equipment
Use Scenario: Channel selection in precision instrumentation front-ends handling sensor outputs or DAC feedback loops. IC Role / Device Role / Timing Role: Rail-to-rail analog switch with flat R_ON and minimal charge injection for signal path routing. Use Value: 4 pF I/O capacitance and 4 Ω R_ON minimize settling time and THD in audio and measurement circuits.	Use Scenario: Solid-state replacement of electromechanical relays in automated test equipment (ATE) signal routing matrices. IC Role / Device Role / Timing Role: High-cycle-life, low-power, bidirectional switch enabling fast reconfiguration of DUT interfaces. Use Value: No moving parts, 100% solid-state reliability, and nanosecond switching reduce test cycle time and maintenance cost.

Hot-Swappable Backplane Interface

ATM 25/155 Cell Switching

Use Scenario: Live insertion/removal of line cards in telecom chassis without system reset or data corruption.

IC Role / Device Role / Timing Role: Bidirectional signal path isolator and voltage-level agnostic bus switch between card-edge connector and backplane ASIC.

Use Value: 5 V tolerance and zero-power isolation prevent bus contention and latch-up during plug events.

Use Scenario: Time-division multiplexing of multiple ATM streams onto shared physical layer links.

IC Role / Device Role / Timing Role: Low-latency, low-distortion 2:1 analog/digital MUX/DEMUX for cell header and payload routing.

Use Value: Sub-0.2 ns propagation delay and 500 MHz bandwidth preserve cell timing integrity and jitter margins.

Low-Distortion Analog Multiplexing

Relay Replacement in Test Equipment

Use Scenario: Channel selection in precision instrumentation front-ends handling sensor outputs or DAC feedback loops.

IC Role / Device Role / Timing Role: Rail-to-rail analog switch with flat R_ON and minimal charge injection for signal path routing.

Use Value: 4 pF I/O capacitance and 4 Ω R_ON minimize settling time and THD in audio and measurement circuits.

Use Scenario: Solid-state replacement of electromechanical relays in automated test equipment (ATE) signal routing matrices.

IC Role / Device Role / Timing Role: High-cycle-life, low-power, bidirectional switch enabling fast reconfiguration of DUT interfaces.

Use Value: No moving parts, 100% solid-state reliability, and nanosecond switching reduce test cycle time and maintenance cost.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 analog switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3257DR	Higher R_ON (7 Ω typ.), same 3.3 V V_CC, no 5 V tolerance in OFF state	Limited to 3.3 V-only systems; unsuitable for mixed-voltage hot-swap	Choose if cost-sensitive and operating exclusively within 3.3 V domain with no overvoltage risk
PI3CH485LE	Wider V_CC range (2.3–5.5 V), higher bandwidth (800 MHz), but larger 20-pin TSSOP package	Better for high-frequency serial links; requires PCB redesign due to pin count and layout	Choose when >500 MHz bandwidth or 5 V V_CC operation is required and board space permits

Compared with SN74CBT3257DR and PI3CH485LE, the QS3VH257S1G8 uniquely balances 5 V tolerance, ultra-low R_ON, and SOIC-16 compactness - making it optimal for industrial hot-swap and telecom multiplexing where voltage robustness and board space are constrained.

Availability

QS3VH257S1G8 is available at Aetrix Electronics and suitable for hot-swappable backplanes, ATM switching nodes, precision analog multiplexing, and relay-replacement test equipment requiring stable component supply across extended temperature ranges.

Supply support for QS3VH257S1G8 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 QS3VH257S1G8 belongs to Renesas' legacy QuickSwitch® analog switch family, originally developed by IDT for high-bandwidth, low-distortion signal routing in live-insertion and telecom infrastructure systems.

FAQ

What is the maximum signal voltage the QS3VH257S1G8 can pass when V_CC is unpowered?

The QS3VH257S1G8 supports –0.5 V to +5.5 V on all I/O pins regardless of V_CC state. When V_CC = 0 V, it maintains high OFF impedance and no DC path to supply rails, allowing safe 5 V signal pass-through during hot-swap events. This behavior is enabled by its N-channel FET architecture with no parasitic diode to V_CC, a core design feature confirmed in the QS3VH257S1G8 datasheet's Features and Absolute Maximum Ratings sections.

Does the QS3VH257S1G8 require external pull-up or pull-down resistors on its S and E control inputs?

No, the QS3VH257S1G8 does not require external biasing on S or E inputs. Its control inputs are LVTTL-compatible with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V at V_CC = 2.7–3.6 V, and input leakage is limited to ±1 μA. Direct connection to FPGA or MCU GPIOs is supported, and internal clamping diodes protect against undershoot - all verified in the DC Electrical Characteristics and Features tables of the QS3VH257S1G8 datasheet.

Can the QS3VH257S1G8 be used for bidirectional analog signal routing in audio applications?

Yes, the QS3VH257S1G8 supports true bidirectional rail-to-rail analog switching from 0 V to 5 V with flat R_ON and 4 pF I/O capacitance - characteristics validated in its Typical ON Resistance vs VIN curve and Capacitance table. Its low distortion, sub-0.2 ns delay, and absence of body diodes make it suitable for line-level audio multiplexing, as confirmed in the Applications section listing "Low distortion analog switch" for the QS3VH257S1G8.

What is the thermal performance of the QS3VH257S1G8 in continuous operation at +85°C ambient?

The QS3VH257S1G8 is fully characterized from –40°C to +85°C, with all DC and switching parameters guaranteed across this range. At +85°C, R_ON increases by <15% versus 25°C (per typical curves), and ICCQ remains ≤4 mA. No derating is required for industrial use, as confirmed in the Operating Temperature specification and Thermal Characteristics notes of the QS3VH257S1G8 datasheet.

Is the QS3VH257S1G8 pin-compatible with earlier IDT QS3VH257 variants in SOIC-16?

Yes, the QS3VH257S1G8 shares identical pinout, electrical behavior, and SOIC-16 mechanical dimensions with all IDT-branded QS3VH257 variants (e.g., QS3VH257S1, QS3VH257S1G), as confirmed in the Pin Configuration diagram and Ordering Information table. The 'G8' suffix denotes green RoHS-compliant packaging but introduces no functional or layout changes to the QS3VH257S1G8 device.

QS3VH257S1G8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 3VH

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 4 x 2:1

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-SOIC

QS3VH257S1G8 FAQ

1.How can I place an order for QS3VH257S1G8 through Aetrix?

Please submit a Request for Quotation (RFQ) for QS3VH257S1G8 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 QS3VH257S1G8 reliable?

The price and inventory of QS3VH257S1G8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH257S1G8 is usually 5 days.

3.What payment methods are accepted for QS3VH257S1G8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH257S1G8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for QS3VH257S1G8?

QS3VH257S1G8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your QS3VH257S1G8 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 QS3VH257S1G8?

For technical support, including QS3VH257S1G8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH257S1G8 requirements.

6.How does Aetrix verify that QS3VH257S1G8 is sourced from the original manufacturer or authorized distributors?

All QS3VH257S1G8 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 QS3VH257S1G8 meets industry standards.

7.What is the process for return or replacement of QS3VH257S1G8?

All QS3VH257S1G8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH257S1G8, 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 QS3VH257S1G8 part is unused and in its original packaging.

Return procedure for QS3VH257S1G8:

1.Submit a request within 90 days.

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

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