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Renesas QS3VH245PAG8
- Part No.:
- QS3VH245PAG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
QS3VH245PAG8.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:571
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Product details
Overview
QS3VH245PAG8 from Renesas Electronics (formerly IDT) is an 8-bit bidirectional bus switch IC with N-channel FET architecture, 4Ω typical ON resistance, <0.2ns propagation delay, 5V-tolerant I/Os, and rail-to-rail 0–5V switching capability. It operates from 2.3V to 3.6V VCC and is rated for industrial temperature range (–40°C to +85°C), enabling hot-swappable Ethernet LAN switch interfaces.
For engineers reviewing the QS3VH245PAG8 datasheet, QS3VH245PAG8 pinout, QS3VH245PAG8 application, or QS3VH245PAG8 equivalent, key selection criteria include LVTTL-compatible OE control, 4pF typical I/O capacitance, high OFF-state impedance (>10⁹ Ω), 500MHz bandwidth, and isolation under power-off conditions without DC path to VCC or GND.
Technical Context
The QS3VH245PAG8 implements a true bidirectional, zero-delay bus switch using N-channel FETs with no parasitic diode to VCC - ensuring complete isolation when powered down. Its control logic accepts LVTTL-compatible OE inputs and drives all eight A/B channel pairs simultaneously.
It supports rail-to-rail analog/digital signal pass-through (0–5V) independent of VCC level, maintains flat RON over voltage and temperature, and features undershoot clamp diodes on all switch and control pins for robust ESD protection in live-insertion systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - enables direct interface with 2.5V and 3.3V logic domains without level shifters |
| RON (Typ.) | 4Ω at VCC = 3V - ensures minimal signal attenuation and distortion for high-speed digital/analog signals |
| Propagation Delay | <0.2ns - contributes negligible timing budget overhead in high-frequency bus architectures |
| I/O Capacitance | 4pF (OFF), 8pF (ON) - minimizes loading on driving sources and preserves signal integrity up to 500MHz |
| Signal Range | 0V to 5V bidirectional - supports mixed-voltage systems and analog pass-through without clamping |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade embedded communications and hot-swap infrastructure |
| OE Compatibility | LVTTL - allows direct connection to FPGA/CPU GPIOs without interface logic |
Pinout & Package
QS3VH245PAG8 is packaged in a 20-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, body size 6.5mm × 4.4mm × 1.2mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE | Output Enable (active-low) | Controls all 8 switches simultaneously; LVTTL-compatible, drives low to connect A↔B paths |
| A0–A7 | Input/Output port A | Bidirectional data terminal; 5V-tolerant, no DC path to VCC/GND when off |
| B0–B7 | Input/Output port B | Complementary bidirectional data terminal; electrically identical to A-side |
| VCC | Supply voltage | Power for control logic only; does not supply switched signal path |
| GND | Ground reference | Common return for control circuitry and substrate bias |
| NC | No-connect | Pin 1 is unconnected; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET architecture with no parasitic diode to VCC | Enables true power-off isolation: zero DC leakage path between A/B ports when VCC = 0V |
| Rail-to-rail 0–5V analog/digital switching | Supports unclamped signal pass-through across full voltage range, independent of VCC |
| 4pF typical OFF-state I/O capacitance | Reduces capacitive loading on upstream drivers, preserving rise/fall times in high-speed buses |
| Undershoot clamp diodes on all I/O and control pins | Protects against –3V transient undershoot without external components in hot-swap environments |
| Flat RON vs. VIN and temperature | Maintains consistent signal attenuation and timing across operating conditions and signal swing |
Applications
| Hot-Swappable Network Interface Card | 10/100BASE-T Ethernet LAN Switch |
|---|---|
Use Scenario: Live insertion/removal of NICs in enterprise servers without system reboot or bus lockup. IC Role / Device Role / Timing Role: Bidirectional bus isolation switch controlling PCIe or LPC data lanes between backplane and pluggable card. Use Value: Prevents ground bounce and signal corruption during insertion by decoupling unpowered card logic from active motherboard bus. | Use Scenario: Signal routing between PHY and MAC layers in managed Ethernet switches supporting multiple 10/100Mbps ports. IC Role / Device Role / Timing Role: Low-latency, high-bandwidth data path switch enabling dynamic port mapping and traffic isolation. Use Value: Enables <0.2ns added delay and 500MHz bandwidth to sustain full-duplex 100Mbps operation with minimal jitter accumulation. |
| Low-Distortion Analog Multiplexer | ATM Cell Switching Interface |
Use Scenario: Selecting between multiple sensor inputs (e.g., thermocouples, RTDs) in precision industrial data acquisition systems. IC Role / Device Role / Timing Role: Rail-to-rail analog pass gate with matched RON and sub-4pF capacitance for minimal THD and settling time impact. Use Value: Delivers <–80dB crosstalk and flat frequency response to 50MHz, preserving signal fidelity without calibration overhead. | Use Scenario: Interfacing ATM SAR controllers to physical layer devices in telecom access equipment handling 25/155Mbps cell streams. IC Role / Device Role / Timing Role: High-speed, low-skew bus switch managing parallel cell header/address routing between ASICs and line cards. Use Value: Supports deterministic 20MHz OE toggle rate and <7ns turn-off delay to meet strict ATM cell timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245APW | Higher typical RON (6Ω), wider VCC range (4.5–5.5V), no 5V tolerance on I/O when VCC = 3.3V | Requires external clamping for 5V signals; suited for 5V-only systems, not mixed-voltage hot-swap | Select if operating exclusively at 5V and lower cost is prioritized over 5V tolerance and power-off isolation |
| PI3CH400QE | Lower bandwidth (300MHz), higher I/O capacitance (6pF OFF), same 2.3–3.6V VCC but no undershoot clamps | Lacks transient protection for live-insertion; less suitable for uncontrolled hot-swap environments | Select for cost-sensitive consumer applications where ESD robustness and zero-VCC isolation are non-critical |
Compared with SN74CBT3245APW and PI3CH400QE, the QS3VH245PAG8 uniquely delivers simultaneous 5V I/O tolerance, true power-off isolation, and undershoot clamping - making it the only option qualified for zero-downtime industrial hot-swap systems requiring guaranteed signal integrity during insertion.
Availability
QS3VH245PAG8 is available at Aetrix Electronics and suitable for hot-swappable network interface cards, 10/100BASE-T Ethernet LAN switches, low-distortion analog multiplexers, and ATM cell switching interfaces requiring stable component supply across extended industrial temperature ranges.
Supply support for QS3VH245PAG8 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 QS3VH245PAG8 belongs to Renesas' legacy QuickSwitch® bus switch product line, originally developed by IDT to address high-bandwidth, low-latency signal routing needs in hot-pluggable communications infrastructure.
FAQ
What is the maximum signal voltage the QS3VH245PAG8 can pass in both ON and OFF states?
The QS3VH245PAG8 supports 0V to 5V rail-to-rail signal pass-through in the ON state and tolerates up to 5.5V DC on its A/B terminals in the OFF state. This 5V tolerance applies regardless of VCC level (2.3V–3.6V), enabling interoperability with mixed-voltage systems without external level-shifting circuitry. The QS3VH245PAG8 achieves this via N-channel FET design with no parasitic diode to VCC.
Does the QS3VH245PAG8 provide isolation when VCC is unpowered?
Yes - the QS3VH245PAG8 provides true power-off isolation due to its N-channel FET architecture with no parasitic diode to VCC. When VCC = 0V, IOFF leakage is ±1μA max across A/B terminals, and there is no DC path to VCC or GND. This behavior is explicitly confirmed in the DC Electrical Characteristics table and enables safe hot-swap operation in backplane systems, unlike many competing bus switches.
What package type is used for the QS3VH245PAG8, and what are its mechanical dimensions?
The QS3VH245PAG8 uses a 20-pin TSSOP (Thin Shrink Small Outline Package) with JEDEC MO-153 compliance, 0.65mm lead pitch, and body dimensions of 6.5mm × 4.4mm × 1.2mm. The "PAG" suffix in the part number specifically denotes this green, RoHS-compliant TSSOP variant, distinct from SOIC (SOG) and QSOP (QG) options.
How does the QS3VH245PAG8 achieve near-zero propagation delay?
The QS3VH245PAG8 achieves <0.2ns propagation delay by eliminating active logic in the signal path - it uses passive N-channel FETs with 4Ω typical RON and only 4pF OFF-state capacitance. Signal delay arises solely from the RC time constant of the switch itself (≈0.2ns at 50pF load), which is negligible compared to driver and receiver rise/fall times. This architecture avoids added ground bounce or timing skew inherent in buffered switches.
Are undershoot clamp diodes integrated into the QS3VH245PAG8, and where are they located?
Yes - undershoot clamp diodes are integrated on all A/B data terminals and the OE control input. Per the datasheet's "Features" section and Absolute Maximum Ratings table, these diodes protect against –3V transient undershoot (pulse width ≤20ns) without requiring external components. This integration is critical for maintaining signal integrity during hot-insertion events in live systems, and is a distinguishing feature versus alternatives like SN74CBT3245APW.
QS3VH245PAG8 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 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-TSSOP
QS3VH245PAG8 FAQ
1.How can I place an order for QS3VH245PAG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH245PAG8 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 QS3VH245PAG8 reliable?
The price and inventory of QS3VH245PAG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH245PAG8 is usually 5 days.
3.What payment methods are accepted for QS3VH245PAG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH245PAG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH245PAG8?
QS3VH245PAG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH245PAG8 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 QS3VH245PAG8?
For technical support, including QS3VH245PAG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH245PAG8 requirements.
6.How does Aetrix verify that QS3VH245PAG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH245PAG8 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 QS3VH245PAG8 meets industry standards.
7.What is the process for return or replacement of QS3VH245PAG8?
All QS3VH245PAG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH245PAG8, 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 QS3VH245PAG8 part is unused and in its original packaging.
Return procedure for QS3VH245PAG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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