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Renesas QS3VH244QG8
- Part No.:
- QS3VH244QG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH244QG8.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,724
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Product details
Overview
QS3VH244QG8 from Renesas Electronics (formerly IDT) is a high-bandwidth, 8-bit bidirectional bus switch with LVTTL-compatible enable control, 4Ω typical ON resistance, <0.2ns propagation delay, and 5V tolerance in both ON/OFF states. It operates from 2.3V to 3.6V VCC and supports hot-swapping in industrial Ethernet switch backplanes.
For engineers reviewing the QS3VH244QG8 datasheet, QS3VH244QG8 pinout, QS3VH244QG8 application, or QS3VH244QG8 equivalent, key selection criteria include rail-to-rail analog switching capability, sub-250ps signal path delay, 500MHz bandwidth, isolation under power-off conditions, and QSOP-20 green package compatibility with legacy 3.3V/2.5V logic systems.
Technical Context
The QS3VH244QG8 implements N-channel FET switches without parasitic diodes to VCC, enabling true isolation during power-down and eliminating DC paths to VCC or GND. Its control inputs are LVTTL-compatible, and undershoot clamp diodes protect all switch and control terminals.
Each of its two independent 4-bit switch banks (Group 1: 1A1–1A4 ↔ 1Y1–1Y4; Group 2: 2A1–2A4 ↔ 2Y1–2Y4) is enabled by separate active-low /1G and /2G signals. Switching occurs with near-zero added delay and no ground bounce, supporting bidirectional 0–5V rail-to-rail signal pass-through.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports dual-supply 2.5V/3.3V logic domains without level shifters |
| RON (Typ.) | 4Ω at VCC = 3V - enables low-distortion analog/RF signal routing up to 500MHz |
| Propagation Delay | <0.2ns - adds negligible timing overhead in high-speed data paths |
| I/O Voltage Tolerance | –0.5V to +5.5V - allows safe interfacing with 5V signals while powered from 3.3V |
| Off-State Leakage | ±1μA max - ensures high-impedance isolation for bus contention prevention |
| Input Capacitance | 4pF typical (switch OFF) - minimizes loading on driving sources and preserves signal integrity |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and networking equipment |
Pinout & Package
QS3VH244QG8 is packaged in a 20-pin QSOP (Green, RoHS-compliant), pin-compatible with industry-standard 0.65mm pitch SOIC-20 footprints. The package provides thermal and electrical performance suitable for high-density PCB layouts in telecom and industrial control applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low group enable | Controls ON/OFF state of respective 4-bit switch bank; LVTTL-compatible, with clamp diodes |
| 1A1–1A4, 2A1–2A4 | Data I/O (Group A) | Bidirectional terminals for first/second 4-bit channel; 5V tolerant, no DC path to VCC/GND |
| 1Y1–1Y4, 2Y1–2Y4 | Data I/O (Group Y) | Paired with A-side pins; identical electrical behavior; supports rail-to-rail 0–5V analog/digital pass-through |
| VCC | Power supply | 2.3V–3.6V logic supply; powers internal control circuitry only - switch conduction is gate-driven |
| GND | Ground reference | Common return for control logic and switch body terminals; critical for noise immunity in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET architecture | Eliminates parasitic diode to VCC - enables true power-off isolation and prevents back-driving |
| Rail-to-rail analog switching | Supports 0–5V signal pass-through in both ON and OFF states - ideal for mixed-signal hot-swap interfaces |
| Flat RON vs. VIN | Consistent 4Ω ON resistance across input voltage range - ensures minimal distortion in analog applications |
| Undershoot clamp diodes | Integrated protection on all A/Y and control pins - eliminates need for external TVS in noisy industrial environments |
| Low I/O capacitance | 4pF typical (OFF state) - reduces signal attenuation and preserves edge rates in >100Mbps data paths |
Applications
| Hot-Swappable Module Interface | Ethernet LAN Backplane Switching |
|---|---|
Use Scenario: Insertion/removal of line cards in live carrier-grade switches without system reset or service interruption. IC Role / Device Role / Timing Role: Bidirectional bus isolator between backplane and pluggable card logic, enabling zero-downtime maintenance. Use Value: Prevents bus contention and ground bounce during hot-insertion; 5V-tolerant I/O handles legacy interface voltages safely. | Use Scenario: Signal routing between PHY and MAC layers in 10/100BASE-T Ethernet switches with shared memory architectures. IC Role / Device Role / Timing Role: High-bandwidth, low-latency data path switch enabling concurrent read/write access to shared SRAM buffers. Use Value: Sub-0.2ns propagation delay avoids timing closure issues; 500MHz bandwidth supports full 100Mbps channel throughput. |
| Analog Sensor Multiplexing | Legacy System Voltage Translation |
Use Scenario: Multiplexing multiple ±10V industrial sensor outputs into a single ADC input in PLC I/O modules. IC Role / Device Role / Timing Role: Low-distortion analog switch with flat RON and rail-to-rail operation preserving signal fidelity. Use Value: 4Ω RON matching and 4pF capacitance minimize THD and settling time; 5V tolerance accommodates unipolar/bipolar sensor ranges. | Use Scenario: Interfacing 5V legacy peripherals (e.g., UART modems, opto-isolators) with modern 3.3V microcontrollers. IC Role / Device Role / Timing Role: Level-agnostic bidirectional bridge replacing discrete MOSFET translators or complex level-shifter ICs. Use Value: Eliminates need for direction control logic; 5V-tolerant I/Os operate safely without external resistors or clamps. |
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 digital-only 3.3V systems; unsuitable for analog or hot-swap with 5V transients | Lower cost where 5V tolerance and analog performance are not required |
| PI3CH480ELEX | Single 8-bit bank (vs. dual 4-bit), 6Ω RON, 3.6V VCC max, no power-off isolation guarantee | Not suited for independent group control or true power-off isolation scenarios | Preferred for compact single-bank routing where layout space is constrained |
Compared with SN74CBT3244PWR and PI3CH480ELEX, the QS3VH244QG8 uniquely delivers dual independent 4-bit banks, guaranteed 5V tolerance in both states, and verified power-off isolation - making it the only option among the three qualified for industrial hot-swap and mixed-voltage analog-digital bridging.
Availability
QS3VH244QG8 is available at Aetrix Electronics and suitable for industrial Ethernet switches, hot-pluggable module interfaces, analog sensor multiplexers, and legacy voltage translation systems requiring stable component supply across extended temperature and long production lifecycles.
Supply support for QS3VH244QG8 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 QS3VH244QG8 belongs to Renesas' legacy QuickSwitch® bus switch family, originally developed by IDT to address high-speed, low-latency, and hot-swap-capable signal routing in telecom and industrial backplanes.
FAQ
What is the maximum signal frequency supported by the QS3VH244QG8?
The QS3VH244QG8 supports up to 500MHz bandwidth, validated by its flat RON characteristics and low 4pF OFF-state capacitance. This enables reliable operation in 100BASE-TX Ethernet (125MHz symbol rate) and high-fidelity analog signal routing. The device's propagation delay remains below 0.2ns across the full operating range, ensuring minimal timing impact in high-speed designs using the QS3VH244QG8.
Does the QS3VH244QG8 support true power-off isolation?
Yes, the QS3VH244QG8 uses N-channel FETs with no parasitic diode to VCC, providing guaranteed isolation when VCC = 0V. Data I/O leakage remains ≤±1μA under power-off conditions, preventing back-driving or contention on shared buses. This feature is explicitly confirmed in the datasheet's "Features" and "DC Electrical Characteristics" sections for the QS3VH244QG8.
Can the QS3VH244QG8 interface 5V signals while powered from 3.3V?
Yes, the QS3VH244QG8 supports 5V-tolerant I/Os in both ON and OFF states, with absolute maximum ratings up to +5.5V on all A/Y and control pins. When VCC = 3.3V, the device safely passes 0–5V signals bidirectionally without level shifting or external protection - a core specification confirmed in the "Absolute Maximum Ratings" and "Features" tables for the QS3VH244QG8.
What is the function of the /1G and /2G pins on the QS3VH244QG8?
The /1G and /2G pins are active-low enable inputs controlling two independent 4-bit switch banks. When /1G is LOW, signals pass bidirectionally between 1A1–1A4 and 1Y1–1Y4; when HIGH, that bank is in high-impedance state. Same applies to /2G and the second bank. This dual-group architecture enables selective isolation in multi-lane interfaces and is documented in the "Function Table" and "Pin Description" sections for the QS3VH244QG8.
Is the QS3VH244QG8 compatible with standard QSOP-20 footprints?
Yes, the QS3VH244QG8 uses a standard 20-pin QSOP package (0.65mm pitch, 7.2mm × 4.4mm body) with green/RoHS-compliant finish. Its pinout matches industry-standard QSOP-20 mechanical dimensions and solder pad layouts, enabling drop-in replacement in existing designs. This packaging detail is specified in the "Ordering Information" and "Pin Configuration" sections of the QS3VH244QG8 datasheet.
QS3VH244QG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
QS3VH244QG8 FAQ
1.How can I place an order for QS3VH244QG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH244QG8 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 QS3VH244QG8 reliable?
The price and inventory of QS3VH244QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH244QG8 is usually 5 days.
3.What payment methods are accepted for QS3VH244QG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH244QG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH244QG8?
QS3VH244QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH244QG8 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 QS3VH244QG8?
For technical support, including QS3VH244QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH244QG8 requirements.
6.How does Aetrix verify that QS3VH244QG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH244QG8 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 QS3VH244QG8 meets industry standards.
7.What is the process for return or replacement of QS3VH244QG8?
All QS3VH244QG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH244QG8, 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 QS3VH244QG8 part is unused and in its original packaging.
Return procedure for QS3VH244QG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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