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Renesas QS3VH126S1G
- Part No.:
- QS3VH126S1G
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH126S1G.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:242
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Product details
Overview
QS3VH126S1G 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, supports hot-swapping and Ethernet LAN switching, and provides 5 V-tolerant I/Os in both ON and OFF states.
For engineers reviewing the QS3VH126S1G datasheet, QS3VH126S1G pinout, QS3VH126S1G application, or QS3VH126S1G equivalent, key selection criteria include bidirectional near-zero-delay signal routing, isolation under power-off conditions, LVTTL-compatible control inputs, undershoot clamp diodes, and SOIC-16 green package compatibility.
Technical Context
The QS3VH126S1G implements four independent N-channel FET switches with no parasitic diode to VCC, enabling true isolation when unpowered and eliminating DC paths to VCC or GND. Each channel features matched RON (<±0.5 Ω typical variation), flat RON vs. input voltage profile, and 4 pF typical I/O capacitance in OFF state.
Control logic uses individual active-high OE inputs (1OE–4OE) with VIH = 2.0 V min at VCC ≥ 2.7 V, supporting direct interfacing with LVTTL drivers. Propagation delay is ≤0.2 ns (tPLH/tPHL), dominated by RC time constant of RON and load capacitance-not internal logic-making timing predictable across temperature and voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables dual-supply operation in 2.5 V and 3.3 V systems without level shifters |
| RON (Typ.) | 4 Ω at VCC = 3.0 V, VIN = 0 V - Ensures minimal signal attenuation and distortion for analog/RF signals |
| Bandwidth | Up to 500 MHz - Supports Fast Ethernet (100BASE-TX) and ATM 25/155 data rates |
| Propagation Delay | ≤0.2 ns - Adds negligible latency in high-speed digital or analog signal paths |
| I/O Voltage Tolerance | –0.5 V to +5.5 V - Allows safe interfacing with 5 V signals while powered from 3.3 V or 2.5 V |
| OFF-State Leakage | ±1 μA max - Maintains high impedance (>10⁹ Ω) for signal integrity during hot-swap events |
| Operating Temp | –40°C to +85°C - Qualified for industrial environments including network infrastructure and embedded control |
Pinout & Package
QS3VH126S1G is packaged in a 16-pin SOIC (Small Outline Integrated Circuit), green RoHS-compliant variant (S1G suffix), with 1.27 mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A–4A | Switch Input/Output A-side | Bidirectional analog/digital signal path; 5 V tolerant, 4 pF capacitance in OFF state |
| 1Y–4Y | Switch Input/Output Y-side | Complementary port to A-side; identical electrical characteristics and voltage tolerance |
| 1OE–4OE | Active-High Enable Control | LVTTL-compatible; VIH ≥ 2.0 V (VCC ≥ 2.7 V); enables individual channel switching |
| VCC | Power Supply | 2.3–3.6 V supply; powers internal logic and gate drive; not connected to signal path |
| GND | Ground Reference | Common return for logic and switch body terminals; decoupling required per high-speed layout |
Key Features
| Feature | Design Value |
|---|---|
| No parasitic diode to VCC | Enables true power-off isolation: zero DC path between A/Y ports and VCC/GND |
| Rail-to-rail analog switching | Supports full 0–5 V signal swing without clipping or distortion in either direction |
| Undershoot clamp diodes | Protects all A, Y, and OE pins from –3 V transient pulses (≤20 ns), enhancing ESD robustness |
| RON matching across channels | Ensures consistent signal gain/attenuation across all four switches for balanced multiplexing |
| Low dynamic power consumption | ΔICC ≤ 30 μA per OE toggle; ICCD ≤ 2 mA at 10 MHz enable frequency |
Applications
| Hot-Swappable Module Interface | Ethernet LAN Switching |
|---|---|
Use Scenario: Insertion/removal of line cards in live telecom or enterprise switches without system reset. IC Role / Device Role / Timing Role: Bidirectional signal isolator and voltage-level agnostic bus switch between backplane and pluggable card. Use Value: Prevents ground bounce and bus contention during insertion; maintains 5 V signal integrity while operating from 3.3 V logic supply. |
Use Scenario: Signal routing in 10/100BASE-TX PHY interface between MAC and physical layer transceivers. IC Role / Device Role / Timing Role: Low-latency, low-distortion analog switch for differential pair enable/disable and MII/RMII path selection. Use Value: Delivers <0.2 ns propagation delay and 500 MHz bandwidth to preserve signal edge integrity at 100 Mbps. |
| Analog Signal Multiplexing | Relay Replacement in Test Equipment |
Use Scenario: Channel selection in multi-input oscilloscopes, data loggers, or sensor signal conditioning front-ends. IC Role / Device Role / Timing Role: Rail-to-rail analog switch with flat RON vs. VIN, enabling accurate voltage transfer across full 0–5 V range. Use Value: 4 Ω RON and <±0.5 Ω matching minimize gain error and crosstalk between selected channels. |
Use Scenario: Solid-state replacement of electromechanical relays in automated test equipment (ATE) and programmable logic controllers. IC Role / Device Role / Timing Role: High-cycle-life, bounce-free switching element with 5 V tolerance and isolation under zero-bias conditions. Use Value: Eliminates mechanical wear, contact arcing, and settling delay-enabling sub-microsecond switching repeatability. |
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 on I/O when VCC = 3.3 V | Best suited for 5 V-only systems; less suitable for mixed-voltage hot-swap interfaces | Select when 5 V logic supply is available and 5 V I/O tolerance is not required |
| MAX4617ESE+ | Single-supply only (VCC = 2.7–5.5 V), higher leakage (±10 nA), no undershoot clamps, slower turn-on (10 ns) | Targeted at general-purpose analog switching; lacks hot-swap isolation and Ethernet-grade bandwidth | Select for cost-sensitive, non-critical analog routing where speed and isolation are secondary |
Compared with SN74CBT16212DGGR and MAX4617ESE+, the QS3VH126S1G uniquely combines 5 V-tolerant I/O at 3.3 V operation, true power-off isolation, and sub-0.2 ns propagation delay-making it optimal for industrial hot-swap and high-speed communications where signal fidelity and system uptime are critical.
Availability
QS3VH126S1G is available at Aetrix Electronics and suitable for industrial hot-swap interfaces, Fast Ethernet LAN switching, and analog multiplexing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for QS3VH126S1G 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 QS3VH126S1G belongs to Renesas' legacy IDT QuickSwitch® analog switch family, engineered specifically for high-bandwidth, low-distortion, hot-plug-capable signal routing in communications and industrial control systems.
FAQ
What is the maximum signal voltage the QS3VH126S1G can pass in the ON state?
The QS3VH126S1G supports rail-to-rail switching from 0 V to 5 V. In the ON state, it reliably passes signals up to +5.5 V (DC) and –0.5 V (DC) on A and Y pins regardless of VCC level-enabling interoperability between 3.3 V logic and 5 V analog subsystems without external level shifters. This capability is confirmed in the Absolute Maximum Ratings table and functional description of the QS3VH126S1G datasheet.
Does the QS3VH126S1G require external pull-up or pull-down resistors on its OE inputs?
No, the QS3VH126S1G OE inputs are LVTTL-compatible with defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds and exhibit ±1 μA input leakage-low enough to be driven directly by standard logic outputs without external biasing. The QS3VH126S1G datasheet specifies no requirement for pull resistors, and internal design ensures clean switching even with unterminated OE traces in properly terminated PCB layouts.
Can the QS3VH126S1G be used in AC-coupled high-speed data paths such as USB or PCIe?
No-the QS3VH126S1G is not specified for USB or PCIe signaling. Its 500 MHz bandwidth and <0.2 ns propagation delay suit 100BASE-TX Ethernet and ATM 25/155, but it lacks equalization, jitter tolerance, or protocol-specific compliance (e.g., USB 2.0 eye diagram, PCIe Gen1+ specs). For those standards, dedicated retimers or protocol-aware switches are required; the QS3VH126S1G remains appropriate for lower-speed parallel or MII/RMII bus switching.
What is the thermal performance of the QS3VH126S1G in continuous operation?
The QS3VH126S1G is characterized for operation from –40°C to +85°C ambient and has a maximum junction temperature of +125°C. With typical ICCQ of 2 mA and RON of 4 Ω, power dissipation remains below 10 mW per channel under 30 mA load-well within SOIC-16 thermal limits. No heatsinking is required in standard industrial airflow; derating is unnecessary below 85°C ambient per the device's thermal resistance (θJA ≈ 120°C/W) and measured thermal performance in the QS3VH126S1G datasheet.
Is the QS3VH126S1G pin-compatible with earlier IDT QS3VH126 variants like QS3VH126QG?
Yes-the QS3VH126S1G (SOIC-16 green) shares identical pinout, function table, and electrical specifications with the QS3VH126QG (QSOP-16 green) and legacy non-green versions. All variants use the same 16-pin configuration: VCC, 1OE–4OE, 1A–4A, 1Y–4Y, GND, and two NC pins. Mechanical differences (SOIC vs. QSOP) do not affect circuit design or layout reuse-only footprint and soldering process differ. This compatibility is explicitly confirmed in the Ordering Information section of the QS3VH126S1G datasheet.
QS3VH126S1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
QS3VH126S1G FAQ
1.How can I place an order for QS3VH126S1G through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH126S1G 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 QS3VH126S1G reliable?
The price and inventory of QS3VH126S1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH126S1G is usually 5 days.
3.What payment methods are accepted for QS3VH126S1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH126S1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH126S1G?
QS3VH126S1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH126S1G 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 QS3VH126S1G?
For technical support, including QS3VH126S1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH126S1G requirements.
6.How does Aetrix verify that QS3VH126S1G is sourced from the original manufacturer or authorized distributors?
All QS3VH126S1G 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 QS3VH126S1G meets industry standards.
7.What is the process for return or replacement of QS3VH126S1G?
All QS3VH126S1G units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH126S1G, 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 QS3VH126S1G part is unused and in its original packaging.
Return procedure for QS3VH126S1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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