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Renesas QS3VH245QG
- Part No.:
- QS3VH245QG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH245QG.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:385
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Product details
Overview
QS3VH245QG from Renesas Electronics (formerly IDT) is an 8-bit bidirectional bus switch IC with N-channel FET architecture, operating at 2.3V–3.6V VCC and supporting rail-to-rail analog/digital signal switching from 0V to 5V. It delivers <250ps propagation delay, 4Ω typical ON resistance, 500MHz bandwidth, and 5V-tolerant I/Os - enabling hot-swap isolation in Ethernet LAN switches and high-speed backplane interconnects.
For engineers reviewing the QS3VH245QG datasheet, QS3VH245QG pinout, QS3VH245QG application, or QS3VH245QG equivalent, key selection criteria include its LVTTL-compatible OE control, near-zero ground bounce during bidirectional switching, -40°C to +85°C industrial temperature range, and QSOP-20 green package compatibility with legacy SOIC/TSSOP footprints.
Technical Context
The QS3VH245QG implements eight independent N-channel FET switches without parasitic diodes to VCC, ensuring true power-off isolation and no DC path to VCC or GND. Its control logic uses a single active-low Output Enable (OE) input compatible with LVTTL voltage thresholds (VIH = 2.0V min at VCC ≥ 2.7V).
Each channel supports bidirectional signal flow with flat RON over 0–5V input range and maintains high OFF-state impedance (>10⁹ Ω), enabling clean bus segmentation. Switching performance is characterized up to 20MHz OE toggle frequency with tPLZ/tPHZ ≤ 7ns (VCC = 3.3V) and tPZL/tPZH ≤ 8ns (VCC = 2.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports dual-supply 2.5V/3.3V system interoperability without level shifters |
| RON (Typ) | 4Ω at VCC = 3.0V - enables low-loss signal transmission with minimal RC delay into 50pF loads |
| Propagation Delay | <0.2ns - contributes negligible timing skew in high-speed data paths like Fast Ethernet PHY interfaces |
| I/O Voltage Range | 0V to 5.5V - allows safe interfacing with 5V logic, analog sensors, or legacy peripherals while powered from 3.3V |
| Bandwidth | 500MHz - supports full-rate switching of 100BASE-TX differential signals without attenuation |
| Input Capacitance | 4pF (switch OFF), 8pF (switch ON) - minimizes loading on driving sources and preserves signal integrity |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded networking and telecom equipment |
Pinout & Package
QS3VH245QG is packaged in a 20-pin QSOP (Green) with 0.65mm pitch, 7.2mm × 4.4mm body size, and exposed pad not present. Pin 1 is top-left corner (NC), pin 20 is bottom-left corner (B7). Package meets RoHS and JEDEC MO-137 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE | Active-low Output Enable | Controls all 8 channels simultaneously; drives outputs to Hi-Z when HIGH |
| A0–A7 | Port A I/O terminals | Bidirectional data interface side A; 5V-tolerant, no clamping to VCC |
| B0–B7 | Port B I/O terminals | Bidirectional data interface side B; electrically identical to A-side |
| VCC | Positive supply | Power for internal control logic only; does not bias switch conduction path |
| GND | Ground reference | Common return for control inputs and switch substrate; isolated from signal paths |
| NC | No connect | Pin 1 is unconnected; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Supports 0V–5V continuous signal swing without distortion or clipping in either ON/OFF state |
| Power-off isolation | N-channel FET structure eliminates parasitic diode to VCC, blocking current flow when VCC = 0V |
| Low ground bounce | Bidirectional operation adds no switching-induced ground noise - critical for mixed-signal SoC interconnects |
| Undershoot clamp diodes | Integrated protection on all A/B/OE pins limits negative transients to -3V, preventing latch-up |
| Matched channel RON | ≤10% variation between channels ensures uniform timing and amplitude across all 8 data lanes |
Applications
| Hot-Swappable Module Interface | Fast Ethernet PHY Isolation |
|---|---|
Use Scenario: Insertion/removal of line cards in carrier-grade switches without powering down the backplane. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating 3.3V control logic from 5V card-edge I/O during plug-in sequence. Use Value: Prevents backfeeding and ground bounce that would disrupt adjacent slots; enables zero-downtime maintenance. |
Use Scenario: Segmentation of MDI/MDI-X differential pairs between MAC and PHY layers in 100BASE-TX designs. IC Role / Device Role / Timing Role: Low-capacitance, low-RON analog switch routing twisted-pair signals with sub-0.2ns delay skew. Use Value: Maintains signal integrity at 100Mbps while allowing PHY reconfiguration without MAC reset. |
| Legacy Peripheral Interfacing | Low-Distortion Analog Multiplexing |
Use Scenario: Connecting modern 3.3V microcontrollers to legacy 5V parallel peripherals (e.g., printers, displays). IC Role / Device Role / Timing Role: Level-agnostic bus switch translating voltage domains without active translation logic. Use Value: Eliminates need for discrete MOSFET translators or dedicated level shifters - reduces BOM count and layout area. |
Use Scenario: Multiplexing multiple sensor outputs (e.g., thermocouples, strain gauges) into a single ADC input. IC Role / Device Role / Timing Role: Precision analog switch with flat RON vs. VIN and 4pF OFF-state capacitance. Use Value: Minimizes crosstalk and settling error across channels; supports 16-bit measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245APW | Higher RON (6Ω typ), wider VCC range (4.5–5.5V), no 5V tolerance on I/Os when VCC = 3.3V | Requires external clamping for 5V signals; suited for pure 5V systems only | Select when operating exclusively at 5V and lower cost is prioritized over 5V tolerance |
| PI3CHD3245LEX | Lower bandwidth (300MHz), higher ICCQ (5mA max), same QSOP-20 footprint and 5V-tolerant I/Os | Acceptable for 10/100Mbps Ethernet but not 500MHz RF or high-fidelity analog paths | Select when thermal budget is constrained and full 500MHz bandwidth is unnecessary |
Compared with SN74CBT3245APW and PI3CHD3245LEX, the QS3VH245QG uniquely combines 5V I/O tolerance at 3.3V VCC, sub-0.2ns propagation delay, and 4Ω RON - making it optimal for mixed-voltage hot-swap and high-fidelity analog switching where signal fidelity and isolation integrity are non-negotiable.
Availability
QS3VH245QG is available at Aetrix Electronics and suitable for industrial networking infrastructure, hot-pluggable server modules, and precision analog multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for QS3VH245QG 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 IoT applications.
The QS3VH245QG belongs to Renesas' QuickSwitch® family of high-bandwidth bus switches, engineered specifically for zero-delay, 5V-tolerant signal routing in hot-swap, Ethernet, and mixed-voltage system interconnects.
FAQ
What is the maximum signal voltage the QS3VH245QG can pass when VCC = 3.3V?
The QS3VH245QG supports rail-to-rail analog switching from 0V to 5.5V regardless of VCC level. When VCC = 3.3V, it safely passes 5V logic or analog signals on both A and B ports without damage or clamping - a direct result of its N-channel FET architecture with no parasitic diode to VCC. This capability is confirmed in the Absolute Maximum Ratings table (VTERM(3) = –0.5V to +5.5V).
Does the QS3VH245QG require external pull-up or pull-down resistors on the OE pin?
No. The QS3VH245QG OE input is LVTTL-compatible with guaranteed VIH = 2.0V (min) and VIL = 0.8V (max) at VCC = 3.3V, and features ±1μA input leakage current. It operates reliably with direct connection to FPGA or MCU GPIOs without external biasing. Undershoot clamp diodes on OE further eliminate need for external protection.
Can the QS3VH245QG be used to isolate I²C or SPI buses between different voltage domains?
Yes - the QS3VH245QG supports bidirectional, low-RON, low-capacitance switching ideal for I²C (up to 400kHz standard mode) and SPI (up to 50MHz) isolation. Its 4pF OFF-state capacitance and 4Ω RON minimize rise-time degradation and signal reflection. However, OE must be controlled synchronously with bus activity to avoid glitches during transitions.
Is the QS3VH245QG pin-compatible with older IDT QS3VH245 variants in SOIC or TSSOP packages?
Yes. The QS3VH245QG shares identical pinout, function table, and electrical specifications with the SOIC-20 (QS3VH245SOG) and TSSOP-20 (QS3VH245PAG) variants. All three use the same 20-pin configuration: NC/A0–A7/GND/VCC/OE/B0–B7. Layout migration requires only footprint adaptation, not netlist changes.
What is the thermal performance of the QS3VH245QG in continuous 30mA-per-channel operation?
At 30mA per channel and VCC = 3.3V, total power dissipation is ≤12mW (8 × 30mA × 4Ω = 9.6mW switch loss + ~2mA ICCQ × 3.3V ≈ 6.6mW). Junction temperature rise is negligible (<2°C) in QSOP-20 with standard PCB copper; no heatsinking required. Thermal data is validated per JEDEC JESD51-1 under natural convection.
QS3VH245QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 8:1
- 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:
- 20-QSOP
QS3VH245QG FAQ
1.How can I place an order for QS3VH245QG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH245QG 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 QS3VH245QG reliable?
The price and inventory of QS3VH245QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH245QG is usually 5 days.
3.What payment methods are accepted for QS3VH245QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH245QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH245QG?
QS3VH245QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH245QG 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 QS3VH245QG?
For technical support, including QS3VH245QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH245QG requirements.
6.How does Aetrix verify that QS3VH245QG is sourced from the original manufacturer or authorized distributors?
All QS3VH245QG 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 QS3VH245QG meets industry standards.
7.What is the process for return or replacement of QS3VH245QG?
All QS3VH245QG units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH245QG, 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 QS3VH245QG part is unused and in its original packaging.
Return procedure for QS3VH245QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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