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Renesas QS3VH244PAG
- Part No.:
- QS3VH244PAG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
QS3VH244PAG.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,885
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Product details
Overview
QS3VH244PAG from Renesas Electronics (formerly IDT) is a high-bandwidth, 8-bit bidirectional bus switch IC with LVTTL-compatible enable control, 4Ω typical ON resistance, <0.2ns propagation delay, and 5V-tolerant I/Os operating from 2.3V to 3.6V VCC. It enables hot-swappable, low-distortion signal routing in Ethernet LAN switches and industrial backplanes.
For engineers reviewing the QS3VH244PAG datasheet, QS3VH244PAG pinout, QS3VH244PAG application, or QS3VH244PAG equivalent, key selection criteria include rail-to-rail 0–5V analog switching capability, ±1μA off-state leakage, 4pF typical I/O capacitance, and industrial temperature support (–40°C to +85°C).
Technical Context
The QS3VH244PAG implements N-channel FET bus switches without parasitic diodes to VCC, enabling true power-off isolation and eliminating DC paths to VCC or GND. Its architecture supports bidirectional data flow with near-zero added delay and no ground bounce under LVTTL control.
It delivers flat RON over voltage and temperature, excellent channel-to-channel RON matching, and operates up to 500MHz bandwidth. The device tolerates 5V signals in both ON and OFF states while powered from 2.5V/3.3V supplies - critical for mixed-voltage system interfacing.
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 - ensures minimal signal attenuation and distortion in high-speed buses |
| tPD (Max.) | 0.2ns - contributes negligible propagation delay in timing-critical interconnect paths |
| I/O Capacitance | 4pF (OFF), 8pF (ON) - minimizes loading on driving sources and preserves signal integrity |
| Signal Range | 0V to 5V rail-to-rail - enables analog and digital signal pass-through across voltage domains |
| Temp Range | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
| Leakage (IOZ) | ±1μA - maintains high-impedance isolation during power-down or fault conditions |
Pinout & Package
QS3VH244PAG is packaged in a 20-pin QSOP (Green, RoHS-compliant) with 0.65mm pitch and standard JEDEC MO-137 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Output Enable (Active-Low) | Independent control of two 4-bit switch banks; LVTTL-compatible, clamped inputs |
| 1A1–1A4, 2A1–2A4 | Data I/O Port A | Bidirectional analog/digital terminals; 5V-tolerant regardless of VCC state |
| 1Y1–1Y4, 2Y1–2Y4 | Data I/O Port Y | Corresponding switched I/O pairs; matched RON ensures uniform channel performance |
| VCC | Supply Voltage | 2.3V–3.6V logic supply; powers internal control circuitry only - no current path to I/Os |
| GND | Ground Reference | Common return for control logic; isolated from signal path to prevent ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| No parasitic diode to VCC | Enables true power-off isolation - zero DC path between A/Y ports when VCC = 0V |
| 5V-tolerant I/Os | Allows safe interface with 5V peripherals while operating from 2.5V/3.3V supply - no external clamping needed |
| Rail-to-rail switching | Passes analog signals from 0V to 5V without clipping - suitable for low-distortion video or sensor signal routing |
| Undershoot clamp diodes | Protects all switch and control pins against –3V undershoot transients - improves ESD robustness |
| High bandwidth (500MHz) | Preserves edge integrity in Fast Ethernet (100BASE-TX) and ATM 25/155 applications |
Applications
| Hot-Swappable Backplane Interface | Fast Ethernet LAN Switching |
|---|---|
Use Scenario: Insertion/removal of line cards in carrier-grade telecom chassis without system reset or data corruption. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating CPU/memory bus from pluggable card I/O during insertion events. Use Value: Prevents backdrive, ground bounce, and supply disturbance via 4Ω RON and 5V-tolerant I/Os - enables zero-downtime maintenance. | Use Scenario: Signal routing between PHY and MAC layers in 10/100BASE-T Ethernet switches. IC Role / Device Role / Timing Role: Low-latency, low-capacitance analog switch for differential pair or control signal isolation. Use Value: <0.2ns tPD and 4pF CI/O preserve signal rise/fall times and minimize jitter in 100Mbps data paths. |
| Analog Signal Multiplexing | Industrial Bus Isolation |
Use Scenario: Routing multiple sensor or DAC output signals to shared ADC input in PLC or test equipment. IC Role / Device Role / Timing Role: Rail-to-rail analog switch with flat RON and matched channels for precision signal selection. Use Value: 4Ω RON and <1% RON matching ensure gain consistency and minimal THD across channels. | Use Scenario: Isolating legacy 5V control buses from modern 3.3V microcontrollers in factory automation systems. IC Role / Device Role / Timing Role: Level-agnostic bidirectional buffer enabling voltage domain bridging without translation logic. Use Value: 5V tolerance in ON/OFF states and –40°C to +85°C operation ensure reliability in harsh industrial environments. |
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.), 3.3V-only VCC range, no 5V tolerance in OFF state | Limited to 3.3V-only systems; unsuitable for hot-swap isolation where 5V backdrive may occur | Prefer QS3VH244PAG when 5V-tolerant isolation or industrial temp range is required |
| PI3CH480ELEX | Single 8-bit bank (vs. dual 4-bit), higher ICCQ (5mA vs. 2mA typ.), same 4Ω RON | Lacks independent enable control per 4-bit group - less flexible for partial-bus gating | Choose QS3VH244PAG for designs requiring granular, dual-bank switching control |
Compared with SN74CBT3244PWR and PI3CH480ELEX, the QS3VH244PAG uniquely combines dual independent 4-bit banks, true 5V tolerance in both states, and industrial temperature qualification - making it optimal for hot-swap and mixed-voltage infrastructure applications.
Availability
QS3VH244PAG is available at Aetrix Electronics and suitable for industrial backplane interfaces, Fast Ethernet LAN switching, analog multiplexing, and bus isolation requiring stable component supply and long-term lifecycle support.
Supply support for QS3VH244PAG 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 QS3VH244PAG belongs to Renesas' QuickSwitch® bus switch product line, engineered specifically for high-bandwidth, low-distortion, hot-swappable signal routing in communications and industrial infrastructure systems.
FAQ
What is the maximum signal voltage the QS3VH244PAG can pass in the ON and OFF states?
The QS3VH244PAG supports rail-to-rail analog switching from 0V to 5V in both ON and OFF states. Its I/Os are explicitly rated for 5V tolerance regardless of VCC state - confirmed by absolute maximum ratings (VTERM(3): –0.5V to +5.5V) and functional description stating "in the ON state, the switches can pass signals up to 5V" and "5V tolerant in OFF and ON state." This makes QS3VH244PAG suitable for mixed-voltage system interfacing without external protection.
Does the QS3VH244PAG require external clamping diodes for ESD or transient protection?
No, the QS3VH244PAG integrates undershoot clamp diodes on all switch and control inputs, as stated in its Features list. These diodes protect against –3V undershoot transients (per Absolute Maximum Ratings), reducing board-level component count and improving robustness in noisy industrial or hot-swap environments - a verified design feature of the QS3VH244PAG.
What is the guaranteed propagation delay specification for the QS3VH244PAG?
The QS3VH244PAG has a maximum propagation delay (tPLH/tPHL) of 0.2ns across the industrial temperature range (–40°C to +85°C) at both VCC = 2.5V and 3.3V, per the Switching Characteristics table. This value reflects the intrinsic RC delay of the 4Ω RON and load capacitance - not added system delay - and is confirmed in the datasheet's functional description ("under 250ps propagation delay").
Can the QS3VH244PAG be used to replace mechanical relays in low-power signal routing?
Yes - the QS3VH244PAG is explicitly listed in Applications as "Replaces mechanical relay," leveraging its near-zero delay, high OFF impedance (>1MΩ), 5V tolerance, and absence of wear-out mechanisms. Its 4Ω RON and 4pF capacitance provide superior signal fidelity versus electromechanical alternatives, especially in high-cycle-count or space-constrained designs using QS3VH244PAG.
Is the QS3VH244PAG pin-compatible with other devices in the QS3VHxxx family?
Yes - the QS3VH244PAG shares identical pinout, package (20-pin QSOP/TSSOP), and functional block diagram with other members of the QS3VHxxx family (e.g., QS3VH245, QS3VH240), as confirmed by the common PIN CONFIGURATION diagram and consistent pin naming (1G, 1A1–1A4, 1Y1–1Y4, etc.). This allows drop-in substitution within the same package variant, provided control logic and signal direction match the QS3VH244PAG function table.
QS3VH244PAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
QS3VH244PAG FAQ
1.How can I place an order for QS3VH244PAG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH244PAG 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 QS3VH244PAG reliable?
The price and inventory of QS3VH244PAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH244PAG is usually 5 days.
3.What payment methods are accepted for QS3VH244PAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH244PAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH244PAG?
QS3VH244PAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH244PAG 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 QS3VH244PAG?
For technical support, including QS3VH244PAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH244PAG requirements.
6.How does Aetrix verify that QS3VH244PAG is sourced from the original manufacturer or authorized distributors?
All QS3VH244PAG 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 QS3VH244PAG meets industry standards.
7.What is the process for return or replacement of QS3VH244PAG?
All QS3VH244PAG units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH244PAG, 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 QS3VH244PAG part is unused and in its original packaging.
Return procedure for QS3VH244PAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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