My Inquiry
My Account
Renesas QS3VH245QG8
- Part No.:
- QS3VH245QG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH245QG8.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
QS3VH245QG8 from Renesas Electronics (formerly IDT) is an 8-bit bidirectional bus switch IC with N-channel FET architecture, 4 Ω typical ON resistance, <0.2 ns propagation delay, 5 V I/O tolerance, and operation from 2.3 V to 3.6 V VCC. It enables hot-swappable, rail-to-rail analog/digital signal routing in high-speed LAN switching and live-system card insertion.
For engineers reviewing the QS3VH245QG8 datasheet, QS3VH245QG8 pinout, QS3VH245QG8 application, or QS3VH245QG8 equivalent, key selection criteria include its LVTTL-compatible OE control, 500 MHz bandwidth, 4 pF OFF-state I/O capacitance, -40°C to +85°C industrial temperature range, and QSOP-20 green package compatibility.
Technical Context
The QS3VH245QG8 implements eight independent N-channel pass-gate switches without parasitic diodes to VCC, enabling true power-off isolation and 5 V tolerance in both ON and OFF states. Its control logic accepts LVTTL-level OE inputs and delivers bidirectional, zero-ground-bounce data flow between A- and B-side ports.
Designed for high-bandwidth signal integrity, it achieves flat RON across 0–5 V signal swing and matches RON within channels to ≤1 Ω variation. The device supports up to 20 MHz OE toggle frequency with no added propagation delay beyond RC time constant (~0.2 ns at 50 pF load).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - supports dual-supply 2.5 V/3.3 V system interfacing |
| RON (Typ.) | 4 Ω at VCC = 3 V - ensures minimal voltage drop and signal attenuation |
| Propagation Delay | <0.2 ns - adds negligible timing overhead in high-speed data paths |
| I/O Capacitance (OFF) | 4 pF typical - reduces loading on upstream drivers and preserves signal edge rate |
| Bandwidth | Up to 500 MHz - supports Fast Ethernet (100BASE-TX) and ATM 155 Mbps signaling |
| Temperature Range | -40°C to +85°C - qualified for industrial-grade embedded and networking equipment |
| 5 V Tolerance | Yes on all A/B I/O pins - allows mixed-voltage domain bridging without level shifters |
Pinout & Package
QS3VH245QG8 is housed in a 20-pin QSOP (Green) package with 0.65 mm pitch and standard JEDEC MO-137AC footprint. Pin 1 is top-left corner, marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE | Output Enable (active-low) | Controls all 8 switches simultaneously; LVTTL-compatible, drives full bus ON/OFF state |
| A0–A7 | Port A bidirectional I/O | One side of each switch; 5 V tolerant, connects to local logic or memory bus |
| B0–B7 | Port B bidirectional I/O | Other side of each switch; 5 V tolerant, routes to peripheral, connector, or hot-swap card |
| VCC | Power supply | Supplies gate drive only; no DC path to I/Os - enables true isolation when powered down |
| GND | Ground reference | Common return for control logic and switch body terminals |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET switches with no parasitic diode to VCC | Enables complete power-off isolation and eliminates DC leakage paths to supply rails |
| Rail-to-rail 0–5 V analog/digital switching | Preserves full signal swing without clipping or distortion in mixed-signal applications |
| Flat RON vs. input voltage | Maintains consistent channel matching and low THD across entire signal range |
| Undershoot clamp diodes on all I/O and control pins | Protects against negative transients down to –3 V (20 ns pulse), improving system ESD robustness |
| Low 4 pF OFF-state I/O capacitance | Minimizes capacitive loading on driving sources, preserving rise/fall times in high-speed links |
Applications
| Hot-Swappable Card Interface | Fast Ethernet LAN Switching |
|---|---|
Use Scenario: Insertion/removal of pluggable network interface cards while system remains powered. IC Role / Device Role / Timing Role: Bidirectional signal isolator and voltage-domain bridge between backplane and card-edge connectors. Use Value: Prevents ground bounce, bus contention, and supply rail disturbance during live insertion using near-zero-delay switching and 5 V tolerance. | Use Scenario: Signal routing between PHY and MAC layers in 10/100BASE-TX switch fabric. IC Role / Device Role / Timing Role: High-fidelity, low-latency bus switch enabling full-duplex 100 Mbps data transfer without added jitter. Use Value: 500 MHz bandwidth and <0.2 ns propagation delay preserve signal integrity and meet 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. IC Role / Device Role / Timing Role: Low-RON, rail-to-rail analog switch replacing mechanical relays or discrete MOSFET arrays. Use Value: 4 Ω RON and flat response yield THD < –80 dB; no turn-on delay avoids signal glitches. | Use Scenario: Isolating legacy 5 V peripherals (e.g., ISA, parallel port) from modern 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Level-agnostic bidirectional buffer with power-down safety and overvoltage protection. Use Value: 5 V I/O tolerance and no parasitic diode allow safe connection to unpowered 5 V buses without backfeeding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245APW | Higher RON (7 Ω typ.), 3.3 V only VCC, no 5 V tolerance on I/Os | Limited to 3.3 V-only systems; unsuitable for mixed-voltage hot-swap | Choose if cost-sensitive and operating exclusively at 3.3 V with no overvoltage risk |
| PI3CH485QE | Lower bandwidth (300 MHz), higher I/O capacitance (6 pF OFF), same QSOP-20 package | Marginally lower signal fidelity in 100 Mbps+ links; acceptable for 10/100BASE-TX with margin | Choose if footprint compatibility is critical and 500 MHz bandwidth is not required |
Compared with SN74CBT3245APW and PI3CH485QE, the QS3VH245QG8 uniquely combines 5 V I/O tolerance, 4 Ω RON, and 500 MHz bandwidth in a single industrial-qualified device-making it optimal for hot-swap and high-fidelity analog/digital multiplexing where voltage domain bridging and signal integrity are non-negotiable.
Availability
QS3VH245QG8 is available at Aetrix Electronics and suitable for hot-swappable card interfaces, Fast Ethernet LAN switching, analog signal multiplexing, and legacy bus isolation requiring stable component supply and long-term industrial availability.
Supply support for QS3VH245QG8 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 QS3VH245QG8 belongs to Renesas' legacy QuickSwitch® bus switch family, originally developed by IDT to address high-bandwidth, low-latency signal routing needs in communications infrastructure and live-system expansion architectures.
FAQ
What is the maximum operating frequency supported by the QS3VH245QG8 for the OE control signal?
The QS3VH245QG8 supports up to 20 MHz OE toggle frequency under VCC = 3.3 V conditions, as specified in the switching characteristics table. This enables rapid bus enable/disable cycling in dynamic routing applications. The QS3VH245QG8 does not impose additional propagation delay beyond its intrinsic RC time constant, making it suitable for real-time reconfiguration in packet-switched systems.
Does the QS3VH245QG8 require external pull-up or pull-down resistors on the OE pin?
No, the QS3VH245QG8 OE input is LVTTL-compatible with defined VIH/VIL thresholds (2.0 V min VIH at VCC ≥ 2.7 V), and internal design ensures clean logic-level recognition without external biasing. The QS3VH245QG8 datasheet specifies no requirement for external resistors, and test circuits confirm reliable operation with direct MCU GPIO or CPLD driver connection.
Can the QS3VH245QG8 safely interface a 5 V microcontroller with a 3.3 V FPGA?
Yes - the QS3VH245QG8's 5 V-tolerant I/Os on both A and B ports allow seamless bidirectional voltage-domain bridging. When VCC = 3.3 V, the QS3VH245QG8 passes signals from 5 V logic to 3.3 V logic without level shifting, provided the 5 V source can sink the small leakage current (<±1 μA) specified in the DC electrical characteristics.
What is the thermal performance of the QS3VH245QG8 in continuous operation?
The QS3VH245QG8 exhibits low power dissipation: quiescent ICCQ is 2 mA typical at max VCC, and dynamic supply current scales linearly with OE toggle frequency. At 20 MHz OE toggling, total ICCD remains below 12 mA (per datasheet curve), resulting in negligible junction temperature rise in QSOP-20 packages under standard PCB copper pour conditions.
Is the QS3VH245QG8 pin-compatible with other members of the QS3VHxxx family?
Yes - the QS3VH245QG8 shares identical pinout, package, and functional block diagram with QS3VH244, QS3VH245, and QS3VH2245 variants in QSOP-20. Differences lie in channel count and control logic (e.g., OE polarity), but physical layout and footprint are fully compatible, enabling drop-in replacement where function matches.
QS3VH245QG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 20-SSOP (0.154", 3.90mm 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-QSOP
QS3VH245QG8 FAQ
1.How can I place an order for QS3VH245QG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH245QG8 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 QS3VH245QG8 reliable?
The price and inventory of QS3VH245QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH245QG8 is usually 5 days.
3.What payment methods are accepted for QS3VH245QG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH245QG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH245QG8?
QS3VH245QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH245QG8 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 QS3VH245QG8?
For technical support, including QS3VH245QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH245QG8 requirements.
6.How does Aetrix verify that QS3VH245QG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH245QG8 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 QS3VH245QG8 meets industry standards.
7.What is the process for return or replacement of QS3VH245QG8?
All QS3VH245QG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH245QG8, 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 QS3VH245QG8 part is unused and in its original packaging.
Return procedure for QS3VH245QG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
QS3VH245QG8 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…
