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Renesas QS3VH244QG
- Part No.:
- QS3VH244QG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH244QG.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
QS3VH244QG from Renesas Electronics (formerly IDT) is a high-bandwidth, 8-bit bidirectional bus switch with LVTTL-compatible enable control, 4Ω typical ON resistance, <0.2 ns propagation delay, and 5V-tolerant I/Os operating from 2.3V to 3.6V VCC. It enables hot-swappable Ethernet LAN switching and rail-to-rail analog signal routing in industrial communications systems.
For engineers reviewing the QS3VH244QG datasheet, QS3VH244QG pinout, QS3VH244QG application, or QS3VH244QG equivalent, key selection criteria include its 500MHz bandwidth, zero-ground-bounce bidirectional switching, -40°C to +85°C operation, and QSOP-20 green package compatibility with legacy QuickSwitch® designs.
Technical Context
The QS3VH244QG implements N-channel FET switches without parasitic diodes to VCC, enabling true isolation during power-off and eliminating DC paths to VCC or GND. Its 5V tolerance in both ON and OFF states supports mixed-voltage system interfacing across logic domains.
Control inputs are LVTTL-compatible with VIH thresholds of 1.7V (2.3–2.7V VCC) or 2.0V (2.7–3.6V VCC); switching is fully bidirectional with flat RON matching (<1Ω variation between channels) and 4pF typical I/O capacitance in OFF state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports both 2.5V and 3.3V logic systems without level shifters |
| RON (Typ.) | 4Ω at VCC = 3.0V - enables low-loss signal pass-through for high-speed digital and analog waveforms |
| Propagation Delay | <0.2 ns - adds negligible timing overhead in critical data paths like Fast Ethernet PHY interfaces |
| Bandwidth | Up to 500 MHz - sustains integrity of fast edge-rate signals up to 100 Mbps Ethernet |
| I/O Capacitance (OFF) | 4 pF typical - minimizes loading on upstream drivers and preserves signal rise/fall times |
| Temperature Range | -40°C to +85°C - qualified for industrial-grade embedded networking and telecom equipment |
| 5V Tolerance | Yes on all A/Y pins and controls - allows safe interfacing with 5V peripherals while powered from 3.3V |
Pinout & Package
QS3VH244QG is housed in a 20-pin QSOP (Green) package, pin-compatible with industry-standard 0.65 mm pitch SOIC-20 footprints. Pin numbering follows standard top-view orientation with GND (Pin 10), VCC (Pin 11), and dual 4-bit switch banks controlled by independent /1G and /2G enables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-Low Output Enable | Independent control of Bank 1 (1A/1Y) and Bank 2 (2A/2Y); LVTTL-compatible, clamped |
| 1A1–1A4, 2A1–2A4 | Data I/O Port A | Bidirectional switch terminals; 5V tolerant, 4pF OFF capacitance |
| 1Y1–1Y4, 2Y1–2Y4 | Data I/O Port Y | Complementary bidirectional switch terminals; electrically identical to A-side |
| VCC | Supply Voltage | 2.3V–3.6V core supply; powers internal logic and switch bias circuitry |
| GND | Ground Reference | Common return path for all switch channels and control logic |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | 0–5V signal pass-through with flat RON - preserves waveform fidelity for audio, sensor, and Ethernet analog front-ends |
| No parasitic diode to VCC | True isolation under power-off - prevents backfeeding and enables safe hot-swap insertion into live backplanes |
| Undershoot clamp diodes | On all A/Y and control pins - protects against negative transients down to -3V (20ns pulse) |
| RON matching | <1Ω channel-to-channel variation - ensures consistent timing and amplitude across parallel data buses |
| Low ground bounce | Bidirectional zero-delay switching - eliminates simultaneous switching noise in high-density memory or I/O expansion |
Applications
| Fast Ethernet LAN Switching | Hot-Swappable Module Interface |
|---|---|
Use Scenario: Isolating 10/100BASE-T PHY signals between line card and backplane during live insertion/removal. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling transparent signal pass-through with sub-0.2 ns delay and no ground bounce. Use Value: Maintains link integrity during hot-swap events by preventing voltage glitches and ensuring 5V-tolerant signal continuity. |
Use Scenario: Interfacing pluggable I/O modules (e.g., serial, GPIO, CAN) to a powered host controller without disrupting system operation. IC Role / Device Role / Timing Role: Power-off-isolated switch providing galvanic separation and voltage domain bridging. Use Value: Eliminates need for mechanical relays or complex sequencing, reducing BOM count and improving MTBF. |
| Low-Distortion Analog Multiplexing | Legacy Bus Isolation |
Use Scenario: Routing precision analog sensor outputs (e.g., thermocouple, RTD) to ADC inputs in industrial PLCs. IC Role / Device Role / Timing Role: Rail-to-rail analog switch with 4Ω RON and 4pF OFF capacitance minimizing THD and settling time. Use Value: Delivers <0.01% gain error and <10 ns settling for 16-bit measurement accuracy without external buffering. |
Use Scenario: Isolating aging ISA or PCI bus segments from modern microcontroller subsystems in retrofitted test equipment. IC Role / Device Role / Timing Role: High-bandwidth digital bus switch decoupling voltage domains and suppressing crosstalk. Use Value: Enables reliable interoperability between 5V legacy peripherals and 3.3V controllers without level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244PWR | Higher RON (7Ω typ.), no undershoot clamps, 3.6V max VCC, not 5V-tolerant in OFF state | Limited to 3.3V-only systems; unsuitable for hot-swap or mixed-voltage isolation | Prefer QS3VH244QG where 5V tolerance, power-off isolation, or industrial temp range are required |
| PI3CH480ELEX | Single-supply 3.3V only, 6Ω RON, no 5V tolerance, smaller 16-pin TSSOP package | Targeted at space-constrained consumer boards; lacks industrial qualification and hot-swap robustness | Choose QS3VH244QG for extended temperature, reliability-critical, or legacy interface bridging |
Compared with SN74CBT3244PWR and PI3CH480ELEX, the QS3VH244QG uniquely combines 5V tolerance in both ON/OFF states, true power-off isolation, and -40°C to +85°C qualification-making it the only option for robust hot-swap and mixed-voltage industrial Ethernet designs.
Availability
QS3VH244QG is available at Aetrix Electronics and suitable for Fast Ethernet switching, hot-swappable module interfaces, low-distortion analog multiplexing, and legacy bus isolation requiring stable component supply and long-term industrial availability.
Supply support for QS3VH244QG 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 QS3VH244QG belongs to Renesas' legacy QuickSwitch® bus switch family, designed specifically for high-fidelity, low-latency signal routing in industrial communications and hot-plug-capable systems.
FAQ
What is the maximum operating frequency supported by the QS3VH244QG?
The QS3VH244QG supports an xG control input toggle frequency up to 20 MHz at VCC = 3.3V, and up to 10 MHz at VCC = 2.5V. Its 500 MHz small-signal bandwidth ensures minimal distortion for high-speed digital and analog signals passing through the switch, making the QS3VH244QG well-suited for Fast Ethernet and other real-time data routing applications.
Does the QS3VH244QG require external pull-up or pull-down resistors on its control inputs?
No, the QS3VH244QG does not require external pull-up or pull-down resistors on its /1G and /2G inputs. Its LVTTL-compatible control inputs have defined VIH and VIL thresholds and include internal undershoot clamp diodes. The QS3VH244QG operates reliably with clean CMOS or TTL drive sources directly connected to these pins.
Can the QS3VH244QG safely interface a 5V signal source with a 3.3V-powered microcontroller?
Yes - the QS3VH244QG provides full 5V tolerance on all A/Y I/O pins and control inputs in both ON and OFF states, even when VCC is 3.3V. This allows safe bidirectional signal translation without level shifters. The QS3VH244QG maintains high OFF impedance (>10⁹ Ω) and low leakage (±1 μA), preserving signal integrity across voltage domains.
Is the QS3VH244QG pin-compatible with earlier IDT QS3VH244 variants?
Yes - the QS3VH244QG uses the same 20-pin QSOP footprint and pinout as original IDT QS3VH244 devices. All signal names (1G, 1A1–1A4, 1Y1–1Y4, etc.), power (VCC, GND), and electrical behavior match the legacy part. The "QG" suffix denotes RoHS-compliant green packaging, and the QS3VH244QG remains a direct drop-in replacement.
What thermal performance can be expected from the QS3VH244QG in continuous operation?
The QS3VH244QG is characterized for continuous operation from -40°C to +85°C ambient, with a maximum junction temperature of +125°C. At 3.3V VCC and 30 mA per channel, power dissipation remains below 10 mW per switch, resulting in negligible self-heating. The QS3VH244QG requires no heatsinking in standard PCB layouts with adequate copper pour.
QS3VH244QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 4:1
- Independent Circuits:
- 2
- 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
QS3VH244QG FAQ
1.How can I place an order for QS3VH244QG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH244QG 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 QS3VH244QG reliable?
The price and inventory of QS3VH244QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH244QG is usually 5 days.
3.What payment methods are accepted for QS3VH244QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH244QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH244QG?
QS3VH244QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH244QG 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 QS3VH244QG?
For technical support, including QS3VH244QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH244QG requirements.
6.How does Aetrix verify that QS3VH244QG is sourced from the original manufacturer or authorized distributors?
All QS3VH244QG 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 QS3VH244QG meets industry standards.
7.What is the process for return or replacement of QS3VH244QG?
All QS3VH244QG units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH244QG, 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 QS3VH244QG part is unused and in its original packaging.
Return procedure for QS3VH244QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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