My Inquiry
My Account
Renesas QS3VH126S1G8
- Part No.:
- QS3VH126S1G8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH126S1G8.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,882
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
QS3VH126S1G8 from Renesas Electronics (formerly IDT) is a quad, active-high, high-bandwidth analog bus switch with N-channel FET architecture, 4 Ω typical ON resistance, rail-to-rail 0–5 V switching, and 500 MHz bandwidth. It operates from 2.3 V to 3.6 V VCC and supports hot-swapping in Ethernet LAN switches and low-distortion signal routing.
For engineers reviewing the QS3VH126S1G8 datasheet, QS3VH126S1G8 pinout, QS3VH126S1G8 application, or QS3VH126S1G8 equivalent, key selection criteria include 5 V tolerance in both ON/OFF states, <250 ps propagation delay, ±1 μA off-state leakage, LVTTL-compatible OE inputs, and bidirectional zero-ground-bounce data flow.
Technical Context
The QS3VH126S1G8 implements four independent N-channel FET switches with no parasitic diode to VCC, enabling true isolation under power-off conditions and eliminating DC paths to VCC or GND. Each channel features undervoltage clamp diodes on all I/O and control pins and supports 5 V tolerant operation regardless of VCC state.
Its switching behavior is controlled by four individual active-high Output Enable (1OE–4OE) signals, delivering near-zero propagation delay (≤0.2 ns typical), flat RON over voltage range, and excellent RON matching between channels-critical for high-fidelity analog and high-speed digital signal integrity in communications interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables interoperability with 2.5 V and 3.3 V logic systems without level shifters |
| RON (Typ.) | 4 Ω at VCC = 3.0 V - ensures minimal insertion loss and signal attenuation in analog/digital paths |
| Bandwidth | 500 MHz - supports Fast Ethernet (100BASE-TX) and ATM 25/155 switching without roll-off |
| Propagation Delay | ≤0.2 ns - adds negligible timing skew in high-speed bus isolation or multiplexing |
| I/O Capacitance | 4 pF (OFF), 8 pF (ON) - minimizes loading on source and load circuits, preserving edge rates |
| 5 V Tolerance | Yes on all A/Y and OE pins - allows interfacing with legacy 5 V peripherals while powered from 3.3 V |
| Off-State Leakage | ±1 μA max - maintains high-impedance isolation during power-down or hot-swap events |
Pinout & Package
QS3VH126S1G8 is packaged in a 16-pin QSOP (Green, lead-free), with pin 1 marked by notch or dot. Package dimensions: 10.2 mm × 3.91 mm × 1.45 mm (L × W × H), 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A–4A | Switch Input/Output (Bidirectional) | Bus A-side terminals; connect to source-side logic or analog signals |
| 1Y–4Y | Switch Input/Output (Bidirectional) | Bus Y-side terminals; route to destination logic, PHY, or connector |
| 1OE–4OE | Active-High Enable Control | Individual per-channel enable; HIGH connects A↔Y, LOW disconnects with Hi-Z |
| VCC | Power Supply | 2.3–3.6 V supply; powers internal logic and gate drive only-not connected to signal path |
| GND | Ground Reference | Signal and power return; decoupling capacitor required adjacent to VCC pin |
| NC | No Connect | Pins 1 and 16 are internally unconnected; must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET with no parasitic diode to VCC | Enables true power-off isolation: no DC path to VCC/GND, preventing backfeeding or latch-up |
| Rail-to-rail 0–5 V analog switching | Preserves full dynamic range of analog sensors, audio, or video signals without clipping |
| Undershoot clamp diodes on all I/O and OE pins | Protects against –3 V transient undershoot, improving robustness in noisy industrial environments |
| Flat RON vs. VIN characteristic | Maintains consistent signal gain and impedance matching across input voltage swing (0–5 V) |
| Bidirectional, zero-ground-bounce dataflow | Eliminates simultaneous switching noise (SSN) in shared ground planes-critical for mixed-signal PCBs |
Applications
| Hot-Swappable Module Interface | Fast Ethernet LAN Switching |
|---|---|
Use Scenario: Pluggable line cards in carrier-grade switches require live insertion/removal without system reset or data corruption. IC Role / Device Role / Timing Role: QS3VH126S1G8 acts as a hot-swap isolation switch between backplane and card logic, enabling safe power sequencing and signal gating. Use Value: Prevents bus contention and backdrive damage during insertion; supports zero-downtime maintenance via 5 V tolerant, Hi-Z OFF-state isolation. | Use Scenario: 10/100BASE-TX Ethernet PHY-to-MAC interface where signal integrity and low latency are critical. IC Role / Device Role / Timing Role: QS3VH126S1G8 serves as a bidirectional, low-RON analog switch for MDI/MDIX crossover or PHY redundancy paths. Use Value: Delivers <0.2 ns added delay and 4 pF OFF capacitance-preserving rise/fall times and minimizing jitter in 100 Mbps data streams. |
| Low-Distortion Analog Signal Routing | ATM Cell Switching (25/155 Mbps) |
Use Scenario: Audio/video routing in broadcast equipment requiring wideband, low-harmonic-distortion signal paths. IC Role / Device Role / Timing Role: QS3VH126S1G8 functions as a rail-to-rail analog multiplexer, passing 0–5 V AC-coupled signals with flat frequency response. Use Value: 500 MHz bandwidth and 4 Ω RON ensure <0.05% THD+N up to 10 MHz; no DC bias shift due to absence of body diode. | Use Scenario: ATM cell header processing and switching in telecom access nodes handling 25 Mbps or 155 Mbps OC-3/OC-12 links. IC Role / Device Role / Timing Role: QS3VH126S1G8 provides high-speed, low-latency signal path selection between SAR ADCs, FIFOs, and framer ICs. Use Value: Sub-ns propagation delay and 5 V tolerance allow direct interfacing with legacy 5 V ATM PHYs while operating from 3.3 V logic rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16212DGGR | Higher RON (6 Ω typ.), 3.3 V only VCC, no 5 V tolerance on I/O when VCC = 3.3 V | Limited to 3.3 V-only systems; unsuitable for mixed-voltage hot-swap or 5 V peripheral interfacing | Select if cost-sensitive and full 5 V tolerance is not required |
| PI3CH480QS | Lower bandwidth (300 MHz), 2.5 V/3.3 V operation, same QSOP-16 package, ±2 μA off-leakage | Adequate for 100BASE-TX but marginal for >200 MHz analog; higher leakage may affect precision sensor muxing | Select if lower bandwidth suffices and Renesas supply chain constraints apply |
Compared with SN74CBT16212DGGR and PI3CH480QS, the QS3VH126S1G8 uniquely combines 500 MHz bandwidth, 4 Ω RON, and guaranteed 5 V tolerance across all pins-making it the only option qualified for simultaneous high-speed digital and rail-to-rail analog use in hot-swap infrastructure.
Availability
QS3VH126S1G8 is available at Aetrix Electronics and suitable for hot-swappable module interfaces, Fast Ethernet LAN switching, low-distortion analog signal routing, and ATM cell switching requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for QS3VH126S1G8 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 QS3VH126S1G8 belongs to Renesas' legacy QuickSwitch® analog switch family-designed specifically for high-bandwidth, low-latency signal isolation in communications infrastructure, hot-plug systems, and mixed-voltage board-level interconnects.
FAQ
What is the maximum operating frequency supported by the QS3VH126S1G8?
The QS3VH126S1G8 supports an enable toggle frequency up to 20 MHz at VCC = 3.3 V, with a specified bandwidth of 500 MHz for analog signal pass-through. Its sub-0.2 ns propagation delay ensures minimal timing impact in high-speed digital paths, making it suitable for Fast Ethernet (100BASE-TX) and ATM 155 Mbps applications. The 500 MHz bandwidth is measured under standard load conditions and reflects small-signal AC performance.
Does the QS3VH126S1G8 support 5 V tolerant I/O when powered from 3.3 V?
Yes, the QS3VH126S1G8 guarantees 5 V tolerance on all A, Y, and OE pins regardless of VCC voltage (2.3 V to 3.6 V). This is enabled by its N-channel FET architecture with no parasitic diode to VCC and integrated undershoot clamp diodes. When VCC = 3.3 V, the device safely passes 0–5 V signals in both ON and OFF states-critical for interfacing with legacy 5 V peripherals in mixed-voltage systems.
What is the OFF-state leakage current specification for the QS3VH126S1G8?
The QS3VH126S1G8 specifies a maximum OFF-state leakage current (IOZ) of ±1 μA over the full industrial temperature range (–40°C to +85°C) and 0–5 V output voltage range. This low leakage ensures high-impedance isolation during power-down or hot-swap events, preventing unintended signal coupling or bus contention. The value is production-tested and guaranteed per datasheet Section "DC Electrical Characteristics".
Can the QS3VH126S1G8 be used for analog audio signal routing?
Yes, the QS3VH126S1G8 is well-suited for analog audio routing due to its rail-to-rail 0–5 V switching capability, flat RON vs. VIN profile, 4 Ω typical ON resistance, and 500 MHz bandwidth. These characteristics preserve signal fidelity, minimize harmonic distortion (<0.05% THD+N up to 10 MHz), and avoid DC bias shifts-making it appropriate for line-level audio, microphone preamp switching, and broadcast-grade signal distribution.
What package type is used for the QS3VH126S1G8?
The QS3VH126S1G8 is supplied in a 16-pin QSOP (Quad Small Outline Package) with green/lead-free finish, designated by the suffix "S1G". Its footprint matches industry-standard QSOP-16, with 1.27 mm pin pitch and body dimensions of 10.2 mm × 3.91 mm. The package includes two NC pins (1 and 16) and requires standard reflow soldering profiles compliant with J-STD-020.
QS3VH126S1G8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 4:1
- 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:
- 14-SOIC
QS3VH126S1G8 FAQ
1.How can I place an order for QS3VH126S1G8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH126S1G8 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 QS3VH126S1G8 reliable?
The price and inventory of QS3VH126S1G8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH126S1G8 is usually 5 days.
3.What payment methods are accepted for QS3VH126S1G8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH126S1G8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH126S1G8?
QS3VH126S1G8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH126S1G8 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 QS3VH126S1G8?
For technical support, including QS3VH126S1G8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH126S1G8 requirements.
6.How does Aetrix verify that QS3VH126S1G8 is sourced from the original manufacturer or authorized distributors?
All QS3VH126S1G8 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 QS3VH126S1G8 meets industry standards.
7.What is the process for return or replacement of QS3VH126S1G8?
All QS3VH126S1G8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH126S1G8, 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 QS3VH126S1G8 part is unused and in its original packaging.
Return procedure for QS3VH126S1G8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
QS3VH126S1G8 Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
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.
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.
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…
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…
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…
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 …
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…
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…
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…
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…
