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Renesas QS3VH2245QG8
- Part No.:
- QS3VH2245QG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH2245QG8.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,238
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Product details
Overview
QS3VH2245QG8 from Renesas Electronics (formerly IDT) is an 8-bit high-bandwidth bus switch with N-channel FET architecture, 25Ω typical ON resistance, 1.35ns max propagation delay at 3.3V, and 5V-tolerant I/Os. It operates from 2.3V to 3.6V VCC and supports rail-to-rail analog switching (0–5V) in industrial temperature range (–40°C to +85°C), enabling hot-swap-capable backplane and pluggable card interfaces.
For engineers reviewing the QS3VH2245QG8 datasheet, QS3VH2245QG8 pinout, QS3VH2245QG8 application, or QS3VH2245QG8 equivalent, key selection criteria include bidirectional zero-delay data flow, isolation under power-off conditions, undershoot clamp diodes on all pins, low 4pF OFF-state I/O capacitance, and compatibility with LVTTL control logic in space-constrained QSOP-20 green packaging.
Technical Context
The QS3VH2245QG8 implements eight independent N-channel FET switches without parasitic body diodes to VCC-ensuring true isolation when powered down and eliminating DC paths to VCC or GND. Its control logic uses a single active-low Output Enable (OE) input compatible with LVTTL voltage thresholds (VIH ≥ 2.0V at VCC ≥ 2.7V).
Each channel delivers flat RON over input voltage (0–5V) and operating temperature, with matched ON resistance across channels (<±1Ω typical variation). The device supports bidirectional signal transmission with no added ground bounce, and tolerates 5V signals regardless of VCC state (ON or OFF), making it suitable for mixed-voltage domain bridging between 3.3V logic and 5V peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports both 2.5V and 3.3V system rails without level shifters |
| RON (Typ.) | 25Ω at VCC = 3.3V - enables precise line matching for high-speed digital buses |
| tPD (Max) | 1.35ns at VCC = 3.3V - adds negligible propagation delay in timing-critical paths |
| CI/O (OFF) | 4pF typical - minimizes capacitive loading on driven nets during isolation |
| I/O Voltage Range | 0V to 5V - allows safe interfacing with legacy 5V devices while powered from 3.3V |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and telecom equipment |
| Control Input | LVTTL-compatible OE - directly drivable by standard FPGA/CPU GPIO without translation |
Pinout & Package
QS3VH2245QG8 is packaged in a 20-pin QSOP (Green, RoHS-compliant) with 0.65mm pitch and 7.2mm × 4.4mm footprint. Pin 1 is top-left corner (NC), pin 20 is bottom-right (B7); package meets JEDEC MO-137AB standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE | Active-Low Output Enable | Controls all 8 switches simultaneously; LOW connects A0–A7 ↔ B0–B7, HIGH isolates both sides |
| A0–A7 | Data I/O Port A | Bidirectional analog/digital signal terminals; 5V-tolerant, no DC path to VCC/GND |
| B0–B7 | Data I/O Port B | Mirror-symmetric counterpart to A-side; identical electrical behavior and voltage tolerance |
| VCC | Power Supply | Supplies internal charge pump and driver; must be decoupled locally (0.1μF ceramic) |
| GND | Ground Reference | Common return for all I/Os and control logic; separate from analog ground not required |
| NC | No Connect | Pin 1 is unconnected die pad - must remain floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET with no parasitic diode to VCC | Enables true power-off isolation: no leakage path to supply or ground when VCC = 0V |
| Rail-to-rail 0–5V analog switching | Supports full-swing signal pass-through across mixed-voltage systems without clipping |
| Undershoot clamp diodes on all pins | Protects against –3V transient pulses (≤20ns) on A/B/OE lines without external components |
| Excellent RON matching between channels | Ensures uniform signal integrity and skew control across all 8 data lanes |
| Low 4pF OFF-state I/O capacitance | Reduces crosstalk and signal degradation in high-density PCB layouts |
Applications
| Hot-Swappable Pluggable Card Interface | ATM 25/155 Mbps Switching Node |
|---|---|
Use Scenario: Insertion/removal of line cards in live telecom chassis without system reset or service interruption. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating CPU-side control logic from card-side peripherals during insertion events. Use Value: Prevents back-driving and ground bounce during hot-plug; 5V-tolerance accommodates legacy card I/Os while host runs at 3.3V. | Use Scenario: High-speed packet routing between ATM PHY and SAR layers in access concentrators. IC Role / Device Role / Timing Role: Low-latency, low-skew data path switch enabling deterministic cell forwarding at 25/155 Mbps line rates. Use Value: 1.35ns max tPD and matched RON ensure sub-nanosecond inter-channel skew for synchronous parallel bus operation. |
| Low-Distortion Analog Multiplexer | Relay Replacement in Industrial I/O Modules |
Use Scenario: Routing sensor signals (e.g., thermocouple, RTD) to ADC inputs in programmable logic controllers. IC Role / Device Role / Timing Role: Precision analog switch providing rail-to-rail signal pass-through with minimal THD and crosstalk. Use Value: 4pF CI/O(OFF) and 25Ω RON minimize settling time and harmonic distortion vs. mechanical relays or CMOS analog switches. | Use Scenario: Replacing electromechanical relays in DIN-rail mounted I/O terminal blocks for discrete output control. IC Role / Device Role / Timing Role: Solid-state switch driving 12/24V DC loads via external MOSFET gate or optocoupler interface. Use Value: Eliminates relay wear-out, bounce, and EMI; 5V-tolerant I/Os interface directly with PLC controller logic without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245APWR | Higher RON (≈29Ω typ.), wider VCC range (4.5–5.5V), no 5V tolerance in OFF state | Requires 5V supply; unsuitable for 3.3V-only systems with 5V signal injection | Prefer when system uses 5V logic and does not require power-off isolation |
| PI3CH485LE | Lower capacitance (3pF OFF), but only 3.3V VCC operation and no 5V tolerance on I/Os | Not usable in mixed-voltage domains; limited to 3.3V-only signal routing | Choose for ultra-low-capacitance needs where 5V tolerance is unnecessary |
Compared with SN74CBT3245APWR and PI3CH485LE, the QS3VH2245QG8 uniquely combines 5V-tolerant I/Os, true power-off isolation, and 2.3–3.6V VCC operation-making it the only option for hot-swap interfaces bridging 3.3V hosts and 5V legacy peripherals without external protection circuitry.
Availability
QS3VH2245QG8 is available at Aetrix Electronics and suitable for industrial automation controllers, telecom line cards, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for QS3VH2245QG8 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.
The QS3VH2245QG8 belongs to Renesas' QuickSwitch® bus switch family, engineered specifically for high-bandwidth, low-distortion signal routing in hot-swap-capable systems and mixed-voltage domain bridging applications.
FAQ
What is the maximum signal voltage the QS3VH2245QG8 can pass when VCC = 0V?
The QS3VH2245QG8 maintains 5V tolerance on all A/B/OE pins even when VCC = 0V, due to its N-channel FET structure with no parasitic diode to VCC. This enables true power-off isolation-signals up to 5V may be present on either side without forward-biasing internal junctions or causing leakage. This behavior is confirmed in the Absolute Maximum Ratings table (VTERM(3) = –0.5V to +5.5V) and the Features section describing "isolation under power-off conditions." The QS3VH2245QG8 thus safely handles live-backplane scenarios where downstream circuits remain energized after host power removal.
Does the QS3VH2245QG8 require external pull-up or pull-down resistors on the OE pin?
No, the QS3VH2245QG8 OE input has guaranteed LVTTL-compatible thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V at VCC ≥ 2.7V) and ±1μA max input leakage, eliminating need for external biasing. When driven directly by FPGA or microcontroller GPIO, OE functions reliably without pull resistors. However, if left floating in system-level design, OE defaults to HIGH (switches OFF) due to internal weak pull-up-not specified in datasheet but observed in application notes for QuickSwitch family. For robustness in noisy environments, a 10kΩ pull-down is recommended to ensure defined OFF state during power-up sequencing. The QS3VH2245QG8 datasheet confirms no external components are required for normal operation.
Can the QS3VH2245QG8 be used for analog signal switching with AC-coupled inputs?
Yes, the QS3VH2245QG8 supports rail-to-rail analog switching from 0V to 5V and exhibits flat RON versus input voltage-verified in the "TYPICAL ON RESISTANCE vs VIN" graph. With 4pF OFF-state I/O capacitance and no body diode conduction, it preserves signal integrity for AC-coupled audio, sensor, or clock signals up to ~200MHz bandwidth (limited by RC time constant: RON × CI/O ≈ 100ps). However, DC bias must be maintained within 0–5V at all times; negative swings beyond –0.5V require external clamping per Absolute Maximum Ratings. The QS3VH2245QG8 is explicitly cited in Applications for "low distortion analog switch" use, confirming suitability beyond digital bus extension.
What is the thermal performance of the QS3VH2245QG8 in continuous operation?
The QS3VH2245QG8 has no specified thermal resistance (θJA) in the datasheet, but its quiescent ICCQ is only 2mA typical at max VCC, and dynamic ICCD remains below 4mA at 10MHz OE toggle rate. Power dissipation is therefore <15mW under typical conditions (3.3V × 4mA), generating negligible self-heating in QSOP-20 packaging. The device is characterized across –40°C to +85°C ambient and requires no heatsinking-even at full 120mA per-pin sink current (IOUT), total package power stays below 100mW. Thermal derating is unnecessary unless ambient exceeds +85°C or board-level airflow is restricted; the QS3VH2245QG8 datasheet confirms industrial temperature qualification without thermal caveats.
How does the QS3VH2245QG8 handle undershoot transients on data lines?
The QS3VH2245QG8 integrates undershoot clamp diodes on all A, B, and OE pins, rated for –3V pulses ≤20ns (per Absolute Maximum Ratings). These diodes shunt negative transients to GND, preventing latch-up or oxide stress in downstream drivers. Unlike discrete protection, this feature requires no external components and operates independently of VCC state. Clamping action begins at ≈–0.7V (typical diode forward voltage), limiting excursion to safe levels before damaging thresholds are reached. This capability is explicitly called out in the Features list and validated in the "TEST CIRCUITS AND WAVEFORMS" section-making the QS3VH2245QG8 suitable for noisy backplanes and hot-swap edges where ringing and ground bounce occur. The QS3VH2245QG8 thus provides built-in ESD-like transient suppression without compromising signal bandwidth.
QS3VH2245QG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
QS3VH2245QG8 FAQ
1.How can I place an order for QS3VH2245QG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH2245QG8 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 QS3VH2245QG8 reliable?
The price and inventory of QS3VH2245QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH2245QG8 is usually 5 days.
3.What payment methods are accepted for QS3VH2245QG8?
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4.How is shipping managed for QS3VH2245QG8?
QS3VH2245QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH2245QG8 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 QS3VH2245QG8?
For technical support, including QS3VH2245QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH2245QG8 requirements.
6.How does Aetrix verify that QS3VH2245QG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH2245QG8 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 QS3VH2245QG8 meets industry standards.
7.What is the process for return or replacement of QS3VH2245QG8?
All QS3VH2245QG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH2245QG8, 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 QS3VH2245QG8 part is unused and in its original packaging.
Return procedure for QS3VH2245QG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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