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Renesas QS3VH244PAG8
- Part No.:
- QS3VH244PAG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
QS3VH244PAG8.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,560
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Product details
Overview
QS3VH244PAG8 from Renesas Electronics (formerly IDT) is a 2.5V/3.3V 8-bit high-bandwidth bus switch featuring N-channel FET architecture, 4Ω typical ON resistance, <0.2ns propagation delay, 5V-tolerant I/Os, and operation across –40°C to +85°C. It enables bidirectional rail-to-rail signal switching (0–5V) in hot-swap and Ethernet LAN switching applications.
For engineers reviewing the QS3VH244PAG8 datasheet, QS3VH244PAG8 pinout, QS3VH244PAG8 application, or QS3VH244PAG8 equivalent, key selection criteria include its LVTTL-compatible enable control, 500MHz bandwidth, 4pF typical I/O capacitance, isolation under power-off conditions, and compatibility with QSOP-20 green packaging.
Technical Context
The QS3VH244PAG8 implements dual 4-bit independent bus switches controlled by two separate LVTTL-compatible /G inputs (1G and 2G), each enabling bidirectional conduction between corresponding A and Y terminals without added ground bounce or propagation delay beyond RC time constant. Its N-channel FET design omits parasitic diodes to VCC, ensuring no DC path to supply or ground.
It supports rail-to-rail analog/digital signal switching from 0V to 5V regardless of VCC (2.3V–3.6V), maintains flat RON over voltage and temperature, and provides 5V tolerance on all I/Os in both ON and OFF states - critical for mixed-voltage system interfacing and hot-plug resilience.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports both 2.5V and 3.3V logic domains with single supply |
| RON (Typ.) | 4Ω at VCC = 3V - enables low-loss signal transmission with minimal voltage drop |
| Propagation Delay | <0.2ns - adds negligible timing overhead in high-speed data paths |
| Bandwidth | Up to 500MHz - suitable for Fast Ethernet (100BASE-TX) and ATM 25/155 signaling |
| I/O Capacitance | 4pF (OFF), 8pF (ON) - minimizes loading on driving and receiving circuits |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
| 5V Tolerance | Yes on all A/Y and control pins - allows safe interfacing with 5V peripherals while powered from 3.3V |
Pinout & Package
QS3VH244PAG8 is packaged in a 20-pin QSOP (Green, RoHS-compliant) with 0.65mm pitch and standard JEDEC MO-137AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-Low Output Enable | Controls respective 4-bit switch banks; LVTTL-compatible, drives A↔Y connection when LOW |
| 1A1–1A4, 2A1–2A4 | Data I/O (Bank 1 & 2) | Bidirectional ports - electrically identical to corresponding Y pins; no direction pin required |
| 1Y1–1Y4, 2Y1–2Y4 | Data I/O (Bank 1 & 2) | Paired with A pins; conduct bidirectionally when associated G is LOW |
| VCC | Power Supply | Supplies internal level-shifting and gate drive; range 2.3V–3.6V |
| GND | Ground Reference | Return path for all signals and internal circuitry; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET with no parasitic diode to VCC | Enables true isolation during power-off; eliminates back-powering and latch-up risk |
| Rail-to-rail 0–5V switching | Supports analog and digital signals beyond VCC - essential for mixed-voltage hot-swap interfaces |
| 4Ω typical RON, flat vs. voltage/temp | Ensures consistent signal integrity and minimal crosstalk across operating conditions |
| Undershoot clamp diodes on all I/Os | Protects against negative transients down to –3V (pulse ≤20ns), improving system ESD robustness |
| Low 4pF OFF-state capacitance | Reduces signal reflection and coupling in high-frequency buses like Ethernet PHY interfaces |
Applications
| Hot-Swappable Peripheral Interface | Fast Ethernet LAN Switching |
|---|---|
Use Scenario: Insertion/removal of pluggable line cards in carrier-grade routers without system reset or service interruption. IC Role / Device Role / Timing Role: Bidirectional signal isolation and voltage-level bridging between backplane (5V) and card-local (3.3V) logic domains. Use Value: Enables zero-downtime maintenance via power-off isolation and 5V-tolerant I/Os - no external level shifters required. | Use Scenario: Signal routing between MAC and PHY layers in 10/100BASE-TX Ethernet switches. IC Role / Device Role / Timing Role: Low-latency, low-capacitance bus switch for MDI/MDI-X differential pair enable/disable and PHY isolation. Use Value: Maintains signal integrity up to 100Mbps with <0.2ns delay and 4pF loading - meets IEEE 802.3 timing budgets. |
| Analog Signal Multiplexing | Legacy Bus Isolation |
Use Scenario: Routing low-distortion analog sensor or audio signals in industrial DAQ systems with shared ADC resources. IC Role / Device Role / Timing Role: Rail-to-rail analog switch replacing mechanical relays; supports 0–5V input range independent of VCC. Use Value: Delivers <0.01% THD due to flat RON matching and absence of body diode leakage - superior to CMOS analog switches. | Use Scenario: Isolating legacy ISA or PCI slots during firmware updates or diagnostics in embedded controllers. IC Role / Device Role / Timing Role: High-impedance OFF-state disconnect (≥1012Ω) preventing back-driving of powered-down subsystems. Use Value: Eliminates need for discrete isolation buffers; guarantees >100kΩ isolation impedance at 5V bias - prevents bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244DBR | Higher RON (7Ω typ.), no 5V tolerance on control inputs, 3.6V max VCC | Limited to 3.3V-only systems; unsuitable for 5V-tolerant hot-swap where control lines may float above VCC | Choose only if system operates strictly at 3.3V and does not require 5V I/O tolerance |
| PI3CH480ELEX | Single 8-bit bank (vs. dual 4-bit), higher ICCQ (8mA max), no undershoot clamps | Lacks independent bank control; less suitable for partial-bus isolation in modular systems | Select when full 8-bit switching suffices and lower quiescent current is not critical |
Compared with SN74CBT3244DBR and PI3CH480ELEX, QS3VH244PAG8 uniquely combines dual independent banks, 5V tolerance on all pins, undershoot protection, and sub-0.2ns delay - making it optimal for industrial hot-swap and Ethernet PHY interface isolation where reliability and mixed-voltage resilience are mandatory.
Availability
QS3VH244PAG8 is available at Aetrix Electronics and suitable for hot-swappable network modules, Fast Ethernet switch fabric designs, and industrial data acquisition systems requiring stable component supply and long-term lifecycle support.
Supply support for QS3VH244PAG8 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.
QS3VH244PAG8 belongs to Renesas' legacy QuickSwitch® bus switch product line, originally developed by IDT to address high-bandwidth, low-latency signal routing needs in communications and hot-swap infrastructure.
FAQ
What is the maximum operating frequency supported by the QS3VH244PAG8?
The QS3VH244PAG8 supports an enable toggle frequency up to 20MHz at VCC = 3.3V, and up to 10MHz at VCC = 2.5V. Its 500MHz small-signal bandwidth ensures integrity for Fast Ethernet (100BASE-TX) and ATM 25/155 data streams. The QS3VH244PAG8 achieves this via ultra-low RON and <4pF OFF-state capacitance, minimizing RC time constants in high-speed paths.
Does the QS3VH244PAG8 support true 5V-tolerant operation on all pins?
Yes - the QS3VH244PAG8 supports 5V tolerance on all A, Y, and control (G) pins in both ON and OFF states, per absolute maximum ratings (VTERM(3) = –0.5V to +5.5V). This allows safe interfacing with 5V peripherals even when VCC is 2.5V or 3.3V, a key requirement for hot-swap and mixed-voltage system design using QS3VH244PAG8.
How does the QS3VH244PAG8 achieve near-zero propagation delay?
The QS3VH244PAG8 achieves <0.2ns propagation delay by using N-channel FETs with no series diode or logic gate in the signal path. Conduction is purely resistive (RON ≈ 4Ω), and delay arises only from the RC time constant of RON and load capacitance - typically <0.2ns at CL = 50pF. This architecture eliminates gate delay, making QS3VH244PAG8 ideal for timing-critical interconnects.
Can the QS3VH244PAG8 be used in analog signal paths?
Yes - the QS3VH244PAG8 supports rail-to-rail analog switching from 0V to 5V independent of VCC, with flat RON vs. input voltage and excellent channel-to-channel RON matching. Its lack of parasitic diodes and low THD make it suitable for low-distortion analog multiplexing in sensor interfaces and audio routing, as confirmed in QS3VH244PAG8 application notes for analog switch replacement.
What package type is used for the QS3VH244PAG8?
The QS3VH244PAG8 uses a 20-pin QSOP (Quad Small Outline Package) with green/RoHS-compliant finish, designated by the "PAG" suffix in the part number. It has a 0.65mm lead pitch and conforms to JEDEC MO-137AC mechanical dimensions - compatible with standard surface-mount assembly processes and reflow profiles.
QS3VH244PAG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
QS3VH244PAG8 FAQ
1.How can I place an order for QS3VH244PAG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH244PAG8 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 QS3VH244PAG8 reliable?
The price and inventory of QS3VH244PAG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH244PAG8 is usually 5 days.
3.What payment methods are accepted for QS3VH244PAG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH244PAG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH244PAG8?
QS3VH244PAG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH244PAG8 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 QS3VH244PAG8?
For technical support, including QS3VH244PAG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH244PAG8 requirements.
6.How does Aetrix verify that QS3VH244PAG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH244PAG8 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 QS3VH244PAG8 meets industry standards.
7.What is the process for return or replacement of QS3VH244PAG8?
All QS3VH244PAG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH244PAG8, 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 QS3VH244PAG8 part is unused and in its original packaging.
Return procedure for QS3VH244PAG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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