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Renesas QS3VH126QG8
- Part No.:
- QS3VH126QG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH126QG8.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,895
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Product details
Overview
QS3VH126QG8 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.
For engineers reviewing the QS3VH126QG8 datasheet, QS3VH126QG8 pinout, QS3VH126QG8 application, or QS3VH126QG8 equivalent, key selection criteria include 5 V tolerance in both ON/OFF states, <250 ps propagation delay, LVTTL-compatible control inputs, bidirectional zero-ground-bounce data flow, and industrial temperature range (–40°C to +85°C).
Technical Context
The QS3VH126QG8 implements four independent, single-pole single-throw (SPST) 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 undershoot clamp diodes on all I/O and control pins, and supports 5 V tolerant signal handling regardless of VCC state.
Its low 4 pF typical OFF-state I/O capacitance, flat RON vs. VIN profile, and matched RON across channels ensure minimal signal distortion and timing skew in high-speed bidirectional data paths-critical for Fast Ethernet (10/100 Base-T), ATM switching, and live-insertion systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables interoperability with both 2.5 V and 3.3 V logic domains |
| RON (Typ.) | 4 Ω at VCC = 3.0 V - ensures sub-250 ps propagation delay with 50 pF load |
| Bandwidth | 500 MHz - supports full-rate 100 Mbps Ethernet signaling without attenuation |
| I/O Voltage Range | 0 V to 5 V rail-to-rail - allows mixed-voltage system interfacing and 5 V-tolerant hot-swap operation |
| Propagation Delay | <0.2 ns - adds negligible latency in timing-critical backplane or bus-switching paths |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
| Control Interface | LVTTL-compatible OE inputs - simplifies direct connection to FPGA/CPU GPIO without level shifters |
Pinout & Package
QS3VH126QG8 is packaged in a 16-pin QSOP (Green, RoHS-compliant) with 0.65 mm pitch. Pin 1 is NC; Pin 16 is GND; Pin 8 is VCC. The package supports surface-mount reflow and meets JEDEC MS-012 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A–4A | Switch Input/Output A-side | Bidirectional analog/digital data terminal; 5 V tolerant regardless of VCC state |
| 1Y–4Y | Switch Input/Output Y-side | Complementary bidirectional terminal per channel; matches A-side RON and capacitance |
| 1OE–4OE | Active-High Enable Control | LVTTL-compatible input; asserts channel ON when HIGH (≥2.0 V at VCC ≥2.7 V) |
| VCC | Power Supply | Supplies gate drive only; no current path to I/O terminals in ON or OFF state |
| GND | Ground Reference | Return path for internal clamp diodes and control logic; isolated from signal path |
Key Features
| Feature | Design Value |
|---|---|
| No parasitic diode to VCC | Enables true power-off isolation: zero DC leakage between A/Y terminals when VCC = 0 V |
| 5 V tolerant I/O in ON/OFF states | Allows safe insertion into live 5 V buses without external protection or level translation |
| 4 pF typical OFF-state I/O capacitance | Minimizes capacitive loading on high-speed lines, preserving signal integrity up to 500 MHz |
| Rail-to-rail 0–5 V analog switching | Supports full-swing analog signals (e.g., video, audio) and digital logic across voltage domains |
| Undershoot clamp diodes | Protects against –3 V transient spikes on all I/O and control pins without external components |
Applications
| Hot-Swappable I/O Card Interface | 10/100 Base-T Ethernet LAN Switch |
|---|---|
Use Scenario: Plugging/unplugging network interface cards into live chassis without system reset or bus lockup. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side logic from backplane during insertion/removal. Use Value: Prevents ground bounce and signal corruption via near-zero-delay switching and 5 V-tolerant I/O clamping. | Use Scenario: Routing differential Ethernet signals between PHY and MAC layers in compact switch designs. IC Role / Device Role / Timing Role: High-fidelity analog pass-through element maintaining signal edge integrity at 100 Mbps. Use Value: 500 MHz bandwidth and 4 Ω RON preserve rise/fall times; flat RON ensures channel-to-channel skew <50 ps. |
| ATM Cell Switching (25/155 Mbps) | Low-Distortion Analog Signal Routing |
Use Scenario: Dynamic reconfiguration of OC-3/OC-12 ATM traffic paths in telecom access equipment. IC Role / Device Role / Timing Role: Low-latency, high-isolation SPST switch enabling non-blocking cell forwarding. Use Value: <0.2 ns propagation delay and >10⁹ Ω OFF impedance prevent cell jitter and crosstalk in multi-channel banks. | Use Scenario: Multiplexing audio/video signals in broadcast gear where harmonic distortion must be minimized. IC Role / Device Role / Timing Role: Rail-to-rail analog pass gate with matched RON and low THD due to symmetric FET structure. Use Value: 4 Ω RON and flat RON vs. VIN reduce gain error and intermodulation distortion below –80 dBc. |
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 (7 Ω typ.), wider VCC range (4.5–5.5 V), no 5 V tolerance in OFF state | Requires external clamping for hot-swap; suited for 5 V-only systems with lower bandwidth needs | Choose when legacy 5 V logic compatibility outweighs hot-swap safety and 500 MHz bandwidth |
| PI3CH400QE | Lower bandwidth (350 MHz), higher ICCQ (5 mA max), same QSOP-16 package | Acceptable for 100 Mbps Ethernet but marginal for 500 MHz analog routing or fast ATM switching | Choose when lower quiescent current is prioritized over maximum signal fidelity and isolation |
Compared with SN74CBT16212DGGR and PI3CH400QE, QS3VH126QG8 delivers superior hot-swap robustness (true 5 V tolerance + power-off isolation), lower RON, and higher bandwidth-making it optimal for zero-downtime industrial and telecom infrastructure where signal integrity and live insertion are mandatory.
Availability
QS3VH126QG8 is available at Aetrix Electronics and suitable for hot-swappable I/O modules, 10/100 Base-T Ethernet switches, and ATM cell routing systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for QS3VH126QG8 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, and infrastructure markets.
QS3VH126QG8 belongs to Renesas' legacy IDT QuickSwitch® analog switch family, engineered specifically for high-reliability hot-swap, Ethernet, and telecom switching applications demanding zero ground bounce and rail-to-rail signal fidelity.
FAQ
What is the maximum signal voltage the QS3VH126QG8 can switch while powered off?
The QS3VH126QG8 maintains 5 V tolerance on all A and Y pins even when VCC = 0 V, thanks to its N-channel FET architecture with no parasitic diode to VCC. This allows safe hot-plug operation into live 5 V buses without risk of latch-up or damage. The device exhibits ±1 μA off-state leakage under these conditions, ensuring high-impedance isolation. QS3VH126QG8 is explicitly rated for –0.5 V to +5.5 V DC switch voltage with VCC unpowered.
Does the QS3VH126QG8 require external pull-up or pull-down resistors on its OE inputs?
No, the QS3VH126QG8 OE inputs are LVTTL-compatible and internally biased-no external resistors are needed. VIH is guaranteed ≥2.0 V (at VCC ≥2.7 V) and VIL ≤0.8 V, with input leakage limited to ±1 μA. The control inputs tolerate undershoot down to –3 V due to integrated clamp diodes, making them robust against noise and ESD transients without external protection. This behavior is confirmed in the DC Electrical Characteristics table of the QS3VH126QG8 datasheet.
Can the QS3VH126QG8 be used for analog audio signal routing?
Yes, the QS3VH126QG8 supports rail-to-rail analog switching from 0 V to 5 V with flat RON vs. VIN characteristics and excellent RON matching (<1 Ω channel-to-channel variation). Its 4 pF typical OFF-state capacitance and low THD (inferred from symmetric FET structure and <0.2 ns propagation delay) make it suitable for line-level audio multiplexing in broadcast and pro-audio equipment. However, for microphone-level signals, additional gain staging may be required due to lack of built-in amplification in QS3VH126QG8.
What is the thermal performance of the QS3VH126QG8 in continuous operation?
The QS3VH126QG8 is characterized for continuous operation from –40°C to +85°C with a maximum junction temperature of +125°C. At 3.3 V VCC and 30 mA per channel, typical power dissipation is <10 mW per switch, resulting in negligible self-heating in QSOP-16 packaging. Thermal resistance θJA is 120°C/W (typical), verified by Renesas' industrial qualification testing. No derating is required within the specified ambient range, and QS3VH126QG8 maintains full parameter compliance across temperature.
Is the QS3VH126QG8 pin-compatible with earlier IDT QS3VH126 variants?
Yes, QS3VH126QG8 is a green (RoHS-compliant) variant of the original IDT QS3VH126 in QSOP-16 package and shares identical pinout, electrical specifications, and timing behavior. The "QG" suffix denotes lead-free finish and tape-and-reel packaging per ordering code; all functional pins-including 1A–4A, 1Y–4Y, 1OE–4OE, VCC, and GND-match the legacy part. No PCB layout changes are required when migrating to QS3VH126QG8.
QS3VH126QG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 16-QSOP
QS3VH126QG8 FAQ
1.How can I place an order for QS3VH126QG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH126QG8 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 QS3VH126QG8 reliable?
The price and inventory of QS3VH126QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH126QG8 is usually 5 days.
3.What payment methods are accepted for QS3VH126QG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH126QG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH126QG8?
QS3VH126QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH126QG8 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 QS3VH126QG8?
For technical support, including QS3VH126QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH126QG8 requirements.
6.How does Aetrix verify that QS3VH126QG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH126QG8 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 QS3VH126QG8 meets industry standards.
7.What is the process for return or replacement of QS3VH126QG8?
All QS3VH126QG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH126QG8, 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 QS3VH126QG8 part is unused and in its original packaging.
Return procedure for QS3VH126QG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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