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Renesas QS34XVH245Q3G8
- Part No.:
- QS34XVH245Q3G8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 80-FSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS34XVH245Q3G8.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 80QVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
QS34XVH245Q3G8 from Renesas Electronics (formerly IDT) is a 32-bit high-bandwidth N-channel FET bus switch optimized for hot-swap and high-speed data routing. It operates from 2.3V to 3.6V VCC, delivers 4Ω typical ON resistance, supports rail-to-rail 0–5V analog/digital signal switching, and achieves <0.2ns propagation delay in bidirectional mode - deployed in 10/100Base-T Ethernet LAN switches and live-insertion backplane interfaces.
For engineers reviewing the QS34XVH245Q3G8 datasheet, QS34XVH245Q3G8 pinout, QS34XVH245Q3G8 application, or QS34XVH245Q3G8 equivalent, key selection criteria include 5V-tolerant I/Os under power-off conditions, LVTTL-compatible OE control, 4pF typical OFF-state I/O capacitance, and QVSOP-80 package compatibility with industrial temperature range (-40°C to +85°C) requirements.
Technical Context
The QS34XVH245Q3G8 implements 32 independent N-channel FET switches with no parasitic diode to VCC, enabling true isolation during power-off and eliminating DC paths to VCC or GND. Each channel supports bidirectional 0–5V signal pass-through with flat RON over voltage and temperature.
Control is managed via four LVTTL-compatible Output Enable (OE1–OE4) inputs, each enabling eight A/B pairs. Switch turn-on/off delays are specified at 1.5–7ns, and dynamic ICCD scales linearly with enable toggle frequency up to 20MHz at VCC = 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports dual-supply 2.5V/3.3V system interfacing without level shifters |
| RON (Typ.) | 4Ω at VCC = 3V - enables low-loss signal integrity for high-frequency analog/digital buses |
| Propagation Delay | <0.2ns - adds negligible timing overhead in synchronous data paths |
| I/O Capacitance (OFF) | 4pF typical - minimizes loading on high-impedance source or trace-terminated lines |
| Signal Range | Rail-to-rail 0–5V - allows mixed-voltage domain bridging (e.g., 3.3V logic ↔ 5V analog) |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded networking and telecom equipment |
| Bandwidth | Up to 500MHz - sustains fast edge rates for 100Mbps+ Ethernet and ATM 25/155 applications |
Pinout & Package
QS34XVH245Q3G8 is housed in an 80-pin QVSOP (Quad Very Small Outline Package), measuring 12.0mm × 10.0mm × 1.2mm, with 0.4mm pitch and exposed thermal pad. Pin 1 marked by dot; pins arranged in four rows (A/B/OE/VCC/GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEx (x=1–4) | Control Input | LVTTL-compatible enable signal; active-low per function table - controls eight A/B pairs each |
| A0–A31 | Switch Terminal | Bidirectional I/O port on logic side; connects to CPU, FPGA, or ASIC bus |
| B0–B31 | Switch Terminal | Bidirectional I/O port on peripheral/card side; tolerant of 0–5V signals regardless of VCC state |
| VCC (pins 2,3,4,5,73,74,75,76) | Power Supply | Core logic supply only; no current path to I/Os - enables safe hot-swap sequencing |
| GND (pins 6,49,50,77) | Reference | Common ground return for logic and switch substrate; decoupling required near VCC pins |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/Os in ON/OFF states | Supports mixed-voltage systems without external clamping or level translation |
| No parasitic diode to VCC | Ensures complete isolation when VCC = 0V - critical for hot-swap safety and backplane survivability |
| 4pF OFF-state I/O capacitance | Reduces signal distortion and crosstalk in high-density PCB layouts and stubbed traces |
| Rail-to-rail 0–5V switching | Enables transparent analog signal routing (e.g., audio, sensor outputs) alongside digital data |
| Flat RON vs. VIN | Maintains consistent insertion loss across full input swing - improves eye diagram margin in serial links |
Applications
| Hot-Swappable Backplane Interface | 10/100Base-T Ethernet LAN Switch |
|---|---|
Use Scenario: Live insertion/removal of line cards in carrier-grade Ethernet switches without powering down the chassis. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side A/B ports during insertion; controlled by system supervisor via OE signals. Use Value: Eliminates ground bounce and bus contention during hot-plug events; 5V tolerance protects upstream PHYs during transient overvoltage. |
Use Scenario: Signal routing between MAC controller and PHY in modular 10/100Base-T switch fabric with shared bus architecture. IC Role / Device Role / Timing Role: High-bandwidth, low-delay path for MII/RMII data lanes; enables flexible port mapping without retiming. Use Value: Sub-0.2ns propagation delay preserves setup/hold margins; 4Ω RON minimizes jitter accumulation across multi-port designs. |
| Low-Distortion Analog Multiplexer | ATM 25/155 Cell Switching Fabric |
Use Scenario: Routing multiple analog sensor outputs (e.g., thermocouple, RTD) to a shared ADC in industrial PLC modules. IC Role / Device Role / Timing Role: Rail-to-rail analog switch with matched RON across channels - used as precision multiplexer front-end. Use Value: 4pF OFF capacitance and no VCC diode leakage prevent charge injection and signal coupling between unselected channels. |
Use Scenario: Interfacing ATM segmentation/reassembly (SAR) chips with physical layer devices in telecom access nodes. IC Role / Device Role / Timing Role: High-speed parallel data switch handling 25Mbps or 155Mbps cell payload routing across internal buses. Use Value: 500MHz bandwidth supports fast edge rates of OC-3/OC-12 clock domains; LVTTL OE control synchronizes with system timing engine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-bandwidth bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245APM | 8-bit configuration, SOIC-24; RON = 5Ω typical; max VIO = 5.5V; no undershoot clamps | Lower channel count limits use to sub-bus segments; lacks integrated undershoot protection on I/Os | Preferred for cost-sensitive, space-constrained 8-bit isolation where full 32-bit routing isn't required |
| PI3CH485QE | 32-bit, TSSOP-56; RON = 6Ω typical; VCC = 3.0–3.6V only; no 2.5V support | Not suitable for mixed 2.5V/3.3V environments; smaller footprint but higher RON increases insertion loss | Applicable where board layout density is prioritized over ultra-low RON and dual-supply flexibility |
Compared with SN74CBT3245APM and PI3CH485QE, the QS34XVH245Q3G8 uniquely combines 32-bit width, 2.5V/3.3V dual-VCC operation, 4Ω RON, and built-in undershoot clamps - making it the only option qualified for industrial hot-swap backplanes requiring simultaneous analog/digital signal integrity and zero-power isolation.
Availability
QS34XVH245Q3G8 is available at Aetrix Electronics and suitable for industrial Ethernet switches, hot-swappable telecom line cards, high-precision analog multiplexing, and ATM cell switching fabrics requiring stable component supply across extended lifecycle programs.
Supply support for QS34XVH245Q3G8 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 infrastructure markets.
QS34XVH245Q3G8 belongs to the QuickSwitch® family of high-speed bus switches, designed specifically for zero-delay, 5V-tolerant signal routing in live-insertion and mixed-voltage system architectures.
FAQ
What is the maximum signal voltage the QS34XVH245Q3G8 can pass in the ON state?
The QS34XVH245Q3G8 supports rail-to-rail switching from 0V to 5V in both ON and OFF states. When enabled, it passes signals up to 5V regardless of VCC level (2.3V–3.6V), and maintains 5V tolerance even when VCC = 0V - a key enabler for hot-swap isolation. This capability is confirmed in the Absolute Maximum Ratings table (VTERM(3) = –0.5V to +5.5V) and Functional Description section.
Does the QS34XVH245Q3G8 require external level shifters when interfacing 3.3V logic with 5V peripherals?
No, the QS34XVH245Q3G8 does not require external level shifters. Its 5V-tolerant I/Os accept and pass 0–5V signals bidirectionally while operating from 2.3V–3.6V VCC. This is explicitly stated in the Features list ("5V tolerant I/Os") and verified in DC Electrical Characteristics (VIN range = –0.5V to +5.5V). The device internally handles voltage domain bridging without signal degradation.
How many independent switch banks does the QS34XVH245Q3G8 support, and how are they controlled?
The QS34XVH245Q3G8 supports four independent 8-bit switch banks (32 total channels), each controlled by a dedicated LVTTL-compatible Output Enable input (OE1–OE4). Each OE pin enables its associated A/B pair group (e.g., OE1 controls A0–A7/B0–B7). This is defined in the Functional Block Diagram, Pin Description, and Function Table - allowing granular, low-latency control of subsystem routing.
What is the thermal performance of the QS34XVH245Q3G8 in continuous operation?
The QS34XVH245Q3G8 is characterized for continuous operation from –40°C to +85°C (Industrial Temperature Range), with quiescent ICCQ ≤16mA and dynamic ICCD scaling linearly with enable frequency. Its QVSOP-80 package includes an exposed thermal pad, and thermal resistance (θJA) is optimized for natural convection in standard PCB layouts - validated in the original IDT datasheet DSC-5593/13 under "Power Supply Characteristics" and "Operating Conditions."
Can the QS34XVH245Q3G8 be used for analog signal routing, and what parameters ensure fidelity?
Yes, the QS34XVH245Q3G8 is qualified for low-distortion analog routing. Key parameters include 4Ω typical RON with flat voltage dependence, 4pF typical OFF-state I/O capacitance, no parasitic diode to VCC (preventing leakage paths), and rail-to-rail 0–5V operation. These are documented in the Features, Capacitance, and DC Electrical Characteristics sections - enabling clean multiplexing of audio, sensor, and other analog signals without added noise or offset.
QS34XVH245Q3G8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 34XVH
- Package/Case:
- 80-FSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 4
- 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:
- 80-QVSOP
QS34XVH245Q3G8 FAQ
1.How can I place an order for QS34XVH245Q3G8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS34XVH245Q3G8 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 QS34XVH245Q3G8 reliable?
The price and inventory of QS34XVH245Q3G8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS34XVH245Q3G8 is usually 5 days.
3.What payment methods are accepted for QS34XVH245Q3G8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS34XVH245Q3G8 transactions.
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4.How is shipping managed for QS34XVH245Q3G8?
QS34XVH245Q3G8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS34XVH245Q3G8 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 QS34XVH245Q3G8?
For technical support, including QS34XVH245Q3G8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS34XVH245Q3G8 requirements.
6.How does Aetrix verify that QS34XVH245Q3G8 is sourced from the original manufacturer or authorized distributors?
All QS34XVH245Q3G8 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 QS34XVH245Q3G8 meets industry standards.
7.What is the process for return or replacement of QS34XVH245Q3G8?
All QS34XVH245Q3G8 units undergo pre-shipment inspection (PSI). If there is an issue with QS34XVH245Q3G8, 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 QS34XVH245Q3G8 part is unused and in its original packaging.
Return procedure for QS34XVH245Q3G8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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