My Inquiry
My Account
Renesas QS34XVH245Q3G
- Part No.:
- QS34XVH245Q3G
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 80-FSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS34XVH245Q3G.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 80QVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,020
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
QS34XVH245Q3G from Renesas Electronics (formerly IDT) is a 32-bit N-channel FET bus switch optimized for hot-swappable, high-bandwidth data routing in industrial communications systems. It operates from 2.3V to 3.6V VCC, delivers ≤250ps propagation delay, 4Ω typical ON resistance, 5V-tolerant I/Os, and supports rail-to-rail analog/digital switching from 0–5V - enabling use in 10/100 Base-T Ethernet LAN switches and live-insertion backplane interfaces.
For engineers reviewing the QS34XVH245Q3G datasheet, QS34XVH245Q3G pinout, QS34XVH245Q3G application, or QS34XVH245Q3G equivalent, key selection criteria include its LVTTL-compatible OE control, 500MHz bandwidth, -40°C to +85°C industrial temperature range, 4pF typical OFF-state I/O capacitance, and QVSOP-80 package compatibility with high-density PCB layouts.
Technical Context
The QS34XVH245Q3G implements 32 independent N-channel MOSFET switches without parasitic body diodes to VCC, ensuring true isolation during power-off and eliminating DC paths to VCC or GND. Each channel supports bidirectional signal flow with no added ground bounce and maintains flat RON across 0–5V input swing.
Control logic uses four LVTTL-compatible Output Enable (OE1–OE4) inputs, each managing eight A/B pairs. Switch turn-on/off delays are specified at 1.5–8ns, and propagation delay is dominated solely by RC time constant (RON × CL), not internal logic - confirming its role as a passive, zero-latency signal path rather than an active buffer or transceiver.
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 insertion loss and signal distortion for high-speed digital/analog signals |
| Propagation Delay | <250ps - contributes negligible timing skew in synchronous bus architectures |
| Bandwidth | Up to 500MHz - supports Fast Ethernet (100Mbps) and ATM 25/155 physical layer signaling |
| I/O Capacitance (OFF) | 4pF typical - reduces loading on driving sources and preserves signal edge integrity |
| Temperature Range | -40°C to +85°C - qualified for industrial-grade embedded networking and telecom equipment |
| Overvoltage Tolerance | 5V on all I/Os in ON/OFF states - allows safe interfacing with mixed-voltage subsystems and hot-swap transients |
Pinout & Package
QS34XVH245Q3G is housed in an 80-pin QVSOP (Quad Very Small Outline Package) with exposed thermal pad, designed for high-density surface-mount assembly and thermal management in compact networking modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEx (x=1–4) | Control Input | LVTTL-compatible enable signal; LOW connects corresponding A/B pair, HIGH isolates |
| A0–A31 | Switch Terminal | 32 bidirectional data inputs/outputs on Bus A side; 5V tolerant, 4pF capacitance |
| B0–B31 | Switch Terminal | 32 bidirectional data inputs/outputs on Bus B side; electrically identical to A-side |
| VCC (pins 2,3,4,5) | Power Supply | Four dedicated 2.3–3.6V supply pins reduce IR drop and improve noise immunity |
| GND (pins 6,49,50,79) | Ground Reference | Four ground pins minimize return-path inductance and suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET architecture with no parasitic diode to VCC | Enables true power-off isolation and eliminates unintended current paths during hot-swap events |
| Rail-to-rail analog/digital switching (0–5V) | Supports both digital bus extension and low-distortion analog signal routing without clamping or attenuation |
| 4Ω typical ON resistance with flat RON vs. VIN | Maintains consistent signal integrity across full input voltage range, critical for multi-level signaling |
| Undershoot clamp diodes on all I/O and control pins | Protects against negative transients down to –3V (20ns pulse), enhancing robustness in noisy industrial environments |
| High OFF-state impedance (<±1μA leakage) | Prevents signal coupling between inactive buses, essential for multiplexed backplane architectures |
Applications
| Hot-Swappable Module Interface | Fast Ethernet LAN Switching |
|---|---|
Use Scenario: Live insertion/removal of line cards in carrier-grade Ethernet switches without system reset or service interruption. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating CPU/memory bus from pluggable card I/O during insertion and removal sequences. Use Value: Enables zero-downtime maintenance via controlled signal gating with <250ps delay and 5V transient tolerance on all pins. |
Use Scenario: Signal routing between PHY and MAC layers in 10/100 Base-T Ethernet switch fabric with shared memory architecture. IC Role / Device Role / Timing Role: High-bandwidth, low-skew data path selector supporting 100Mbps packet forwarding with minimal jitter accumulation. Use Value: Delivers 500MHz bandwidth and 4pF OFF-state capacitance to preserve signal rise/fall times and meet IEEE 802.3 timing budgets. |
| Analog Signal Multiplexing | ATM Cell Switching Interface |
Use Scenario: Low-distortion routing of sensor or audio signals in industrial PLC I/O modules requiring channel selection under microcontroller control. IC Role / Device Role / Timing Role: Rail-to-rail analog switch replacing mechanical relays, driven by LVTTL OEx signals synchronized to sampling clock. Use Value: Achieves <0.01% THD due to flat 4Ω RON and absence of body diode conduction, eliminating crossover distortion. |
Use Scenario: Interfacing ATM SAR (Segmentation and Reassembly) controllers with physical layer devices in OC-3/OC-12 transport equipment. IC Role / Device Role / Timing Role: 32-bit parallel data path switch enabling dynamic reconfiguration of cell payload routing between multiple ATM ports. Use Value: Supports 155Mbps (OC-3) and 622Mbps (OC-12) line rates via sub-250ps propagation delay and 5V-tolerant I/O for legacy interface compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-bandwidth bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245APM | 8-bit configuration (vs. 32-bit); 5Ω RON; 3.3V-only VCC; SOIC-24 package | Requires four devices for full 32-bit coverage; lower integration density and higher board area | Preferred for cost-sensitive, low-channel-count designs where layout space permits discrete implementation |
| PI3CH485QE | 32-bit, but only 2.5V VCC operation; 6Ω RON; 80-pin TQFP package; no 5V I/O tolerance | Not suitable for mixed-voltage or hot-swap scenarios requiring 5V transient handling | Applicable only in clean, single-supply 2.5V systems where overvoltage protection is externally managed |
Compared with SN74CBT3245APM and PI3CH485QE, QS34XVH245Q3G uniquely combines 32-bit integration, 2.3–3.6V VCC flexibility, 5V I/O tolerance, and QVSOP packaging - making it the only option qualified for industrial hot-swap and Fast Ethernet backplane routing without supplemental protection circuitry.
Availability
QS34XVH245Q3G is available at Aetrix Electronics and suitable for industrial Ethernet switches, hot-pluggable telecom line cards, analog multiplexer modules, and ATM transport equipment requiring stable component supply across extended product lifecycles.
Supply support for QS34XVH245Q3G 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.
QS34XVH245Q3G belongs to Renesas' legacy QuickSwitch® bus switch portfolio - engineered specifically for zero-delay, high-isolation signal routing in live-insertion and high-speed communications systems.
FAQ
What is the maximum operating frequency supported by the QS34XVH245Q3G?
The QS34XVH245Q3G supports up to 500MHz bandwidth for analog/digital signal switching. Its near-zero propagation delay (<250ps) and flat RON characteristics ensure signal fidelity at Fast Ethernet (100Mbps) and ATM 155Mbps line rates. The device does not impose clock-rate limitations - system bandwidth is determined by external driver/load impedance and PCB layout, not internal logic.
Does the QS34XVH245Q3G support hot-swap operation with power sequencing?
Yes, the QS34XVH245Q3G is explicitly designed for hot-swap applications. Its N-channel FET structure lacks parasitic diodes to VCC, enabling true isolation when VCC is unpowered. With 5V-tolerant I/Os and undershoot clamp diodes, QS34XVH245Q3G safely handles transients during live insertion - a core requirement validated in its "Hot-Swapping" application note.
What package type is used for the QS34XVH245Q3G?
The QS34XVH245Q3G is packaged in an 80-pin QVSOP (Quad Very Small Outline Package) with green RoHS-compliant finish. This fine-pitch surface-mount package features four VCC and four GND pins for low-inductance power delivery, and is optimized for high-density PCB layouts in networking and telecom modules.
Can the QS34XVH245Q3G be used for analog signal switching?
Yes, the QS34XVH245Q3G supports rail-to-rail analog switching from 0V to 5V with 4Ω typical RON and flat RON vs. VIN. Its lack of body diodes prevents signal clipping, and 4pF OFF-state capacitance minimizes crosstalk - making QS34XVH245Q3G suitable for low-distortion analog multiplexing in industrial sensor and audio I/O systems.
What is the guaranteed operating temperature range for the QS34XVH245Q3G?
The QS34XVH245Q3G is fully characterized and guaranteed for industrial operation from –40°C to +85°C. This range is confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section, supporting deployment in uncontrolled environments such as base station cabinets, factory automation controllers, and outdoor network nodes.
QS34XVH245Q3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 34XVH
- Package/Case:
- 80-FSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
QS34XVH245Q3G FAQ
1.How can I place an order for QS34XVH245Q3G through Aetrix?
Please submit a Request for Quotation (RFQ) for QS34XVH245Q3G 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 QS34XVH245Q3G reliable?
The price and inventory of QS34XVH245Q3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS34XVH245Q3G is usually 5 days.
3.What payment methods are accepted for QS34XVH245Q3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS34XVH245Q3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS34XVH245Q3G?
QS34XVH245Q3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS34XVH245Q3G 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 QS34XVH245Q3G?
For technical support, including QS34XVH245Q3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS34XVH245Q3G requirements.
6.How does Aetrix verify that QS34XVH245Q3G is sourced from the original manufacturer or authorized distributors?
All QS34XVH245Q3G 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 QS34XVH245Q3G meets industry standards.
7.What is the process for return or replacement of QS34XVH245Q3G?
All QS34XVH245Q3G units undergo pre-shipment inspection (PSI). If there is an issue with QS34XVH245Q3G, 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 QS34XVH245Q3G part is unused and in its original packaging.
Return procedure for QS34XVH245Q3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
QS34XVH245Q3G Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
