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Renesas QS3VH251QG
- Part No.:
- QS3VH251QG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH251QG.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:582
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Product details
Overview
QS3VH251QG from Renesas Electronics (formerly IDT) is a quad 8:1 analog multiplexer/demultiplexer bus switch with N-channel FET architecture, 4Ω typical ON resistance, <0.2ns propagation delay, 5V-tolerant I/Os, and rail-to-rail 0–5V signal switching. It operates from 2.3V to 3.6V VCC and supports hot-swapping in industrial backplane and live-insertion systems.
For engineers reviewing the QS3VH251QG datasheet, QS3VH251QG pinout, QS3VH251QG application, or QS3VH251QG equivalent, key selection criteria include its 500MHz bandwidth, high OFF-state impedance (>10⁹ Ω), bidirectional zero-delay operation, LVTTL-compatible control inputs, and dual-package availability in green QSOP and TSSOP.
Technical Context
The QS3VH251QG implements four independent 8:1 analog MUX/DEMUX channels using N-channel pass transistors without parasitic body diodes to VCC-enabling true power-off isolation and no DC path to supply or ground. Each channel features matched RON (<1Ω variation between channels) and flat RON vs. input voltage characteristics across the full 0–5V range.
Control logic uses active-low Enable (E) and three-bit binary Select (S2:S0) per channel, with LVTTL-compatible thresholds (VIH = 2.0V min at VCC ≥ 2.7V). Undershoot clamp diodes protect all switch and control pins, and dynamic power consumption scales linearly with enable toggle frequency up to 20MHz.
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 translation |
| RON (Typ) | 4Ω at VCC = 3.0V - enables low-loss signal routing with <50mV drop at 30mA load |
| Propagation Delay | <0.2ns - adds negligible timing skew in high-speed data paths |
| Bandwidth | 500MHz - preserves integrity of fast digital and analog waveforms up to 500MHz |
| I/O Voltage Range | 0V to 5V - allows interfacing with 5V legacy peripherals while powered from 3.3V or 2.5V |
| OFF-State Impedance | >1 GΩ - provides strong channel isolation during disable or power-down states |
| Capacitance (Demux OFF) | 4pF typical - minimizes loading on source signals and reduces crosstalk |
Pinout & Package
QS3VH251QG is packaged in a 16-pin QSOP (Green) with 0.65mm pitch. Pin assignments are validated per IDT DSC-5944/11 datasheet Rev. February 2014.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I0–I7 | Data Inputs (per channel) | Eight bidirectional analog/digital input terminals per MUX; tolerate 0–5V regardless of VCC |
| Y | Data Output (per channel) | Single bidirectional output terminal per MUX; connects to selected Ix when enabled |
| S0–S2 | Select Inputs | 3-bit binary address controlling which of eight inputs connects to Y (S2 MSB) |
| E | Enable Input | Active-low global enable; disables all four channels when HIGH (Z-state on Y) |
| VCC | Power Supply | Core logic and gate drive supply; 2.3V–3.6V range |
| GND | Ground Reference | Signal and substrate reference for all I/O and internal circuitry |
| NC | No Connect | Internally unused pin; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET switches without parasitic diode to VCC | Enables true power-off isolation: no leakage path to VCC or GND when unpowered |
| 5V-tolerant I/Os in ON/OFF states | Allows safe connection to 5V buses while operating from 2.5V/3.3V supplies-no external clamping needed |
| Rail-to-rail 0–5V analog switching | Preserves full dynamic range of sensor, audio, or video signals without clipping or distortion |
| Bidirectional near-zero-delay operation | Eliminates ground bounce and timing skew in bidirectional data paths such as memory or bus arbitration |
| Undershoot clamp diodes on all pins | Protects against –3V transient undershoot events without requiring external TVS components |
Applications
| Hot-Swappable Backplane Interface | High-Speed Memory Multiplexing |
|---|---|
Use Scenario: Live insertion/removal of line cards in telecom or industrial chassis without powering down the main system. IC Role / Device Role / Timing Role: QS3VH251QG acts as a hot-swap isolation switch, enabling/disabling data paths between midplane and pluggable modules under software control. Use Value: Prevents bus contention and supply glitches during card insertion; supports zero-downtime maintenance with guaranteed 5V-tolerant signaling. | Use Scenario: Sharing a single DDR or SRAM bus among multiple controllers or peripherals in space-constrained embedded systems. IC Role / Device Role / Timing Role: QS3VH251QG functions as a low-latency 8:1 analog MUX, routing address/data lines between CPU, FPGA, and memory banks. Use Value: Delivers sub-0.2ns propagation delay and 4Ω RON to maintain signal integrity at >100MHz clock rates without added timing margin. |
| ATM Cell Switching (25/155 Mbps) | Analog Signal Routing in Test Equipment |
Use Scenario: Low-jitter signal path selection in ATM network interface cards handling OC-1 (51.84 Mbps) and OC-3 (155.52 Mbps) traffic. IC Role / Device Role / Timing Role: QS3VH251QG serves as a high-bandwidth demux, distributing incoming cell streams to parallel processing engines based on header bits. Use Value: 500MHz bandwidth and flat RON ensure minimal rise-time degradation and jitter accumulation across 8 parallel paths. | Use Scenario: Reconfigurable signal path routing in automated test equipment (ATE) where analog stimulus/response channels must be dynamically assigned to DUT pins. IC Role / Device Role / Timing Role: QS3VH251QG operates as a precision analog switch, selecting one of eight sensor inputs or DAC outputs under microcontroller control. Use Value: 4pF OFF-capacitance and >1GΩ OFF-impedance minimize crosstalk and loading errors in µV-level measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16244DGGR | 16-bit non-inverting bus switch; 5V-tolerant, 3.3V-only VCC; no select logic - requires external decoding | Fixed-path expansion rather than programmable 8:1 routing; suited for parallel bus gating, not address-driven MUX | Choose when needing wide-bus gating without address decoding overhead; not suitable for dynamic channel selection. |
| ADG732BRUZ | 32-channel CMOS analog MUX; 3V-only supply; 4.5Ω RON; SPI-controlled; no 5V tolerance | Higher channel count with serial configuration; lacks hot-swap isolation and 5V I/O compatibility | Choose for dense, software-configured routing in 3V-only systems; avoid where 5V interoperability or power-off safety is required. |
Compared with SN74CBT16244DGGR and ADG732BRUZ, the QS3VH251QG uniquely combines integrated 3-bit decode logic, 5V-tolerant I/Os, power-off isolation, and sub-0.2ns delay-making it optimal for hot-swap, mixed-voltage, and high-speed deterministic routing where timing predictability and safety are critical.
Availability
QS3VH251QG is available at Aetrix Electronics and suitable for hot-swappable backplanes, high-speed memory multiplexing, ATM switching infrastructure, and reconfigurable test instrumentation requiring stable component supply and long-term industrial-grade availability.
Supply support for QS3VH251QG 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 QS3VH251QG belongs to Renesas' legacy QuickSwitch® analog bus switch family, originally developed by IDT to address high-bandwidth, low-latency signal routing needs in live-insertion and telecom systems.
FAQ
What is the maximum signal voltage the QS3VH251QG can handle?
The QS3VH251QG supports 0V to 5V rail-to-rail analog and digital signals on all I/O pins-regardless of whether VCC is 2.5V or 3.3V. This 5V tolerance applies in both ON and OFF states, eliminating need for external level shifters or clamps when interfacing with legacy 5V peripherals. Absolute maximum DC input voltage is +5.5V.
Does the QS3VH251QG require external pull-up or pull-down resistors on control inputs?
No, the QS3VH251QG does not require external biasing on S0–S2 or E inputs. Its LVTTL-compatible control thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC ≥ 2.7V) allow direct interfacing with standard 3.3V or 2.5V logic outputs. Internal input leakage remains ≤±1μA across temperature, ensuring stable logic levels without external resistors.
Can the QS3VH251QG be used in power-off isolation applications?
Yes-the QS3VH251QG features N-channel FET switches with no parasitic diode to VCC, providing true power-off isolation. When VCC = 0V, IOFF leakage is ≤±1μA across the full 0–5V I/O range, and there is no DC path to VCC or GND. This makes QS3VH251QG suitable for hot-swap architectures where boards may be inserted into live backplanes.
What is the typical ON-resistance matching between channels of the QS3VH251QG?
The QS3VH251QG exhibits excellent RON matching: typical variation is <1Ω between any two channels at identical VCC and VIN conditions. This uniformity ensures consistent signal attenuation and timing behavior across all four MUX/DEMUX sections-critical for applications like parallel data routing or multi-channel sensor aggregation where channel-to-channel skew must be minimized.
Is the QS3VH251QG pin-compatible with other devices in the QS3VHxxx family?
Yes-the QS3VH251QG shares identical pinout, package footprint, and functional interface with other members of the QS3VHxxx series (e.g., QS3VH125, QS3VH244), including the same 16-pin QSOP/TSSOP layout, I0–I7/S0–S2/E/Y signal assignment, and power/ground placement. This enables drop-in replacement within the same family for design reuse and variant optimization.
QS3VH251QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 16-QSOP
QS3VH251QG FAQ
1.How can I place an order for QS3VH251QG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH251QG 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 QS3VH251QG reliable?
The price and inventory of QS3VH251QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH251QG is usually 5 days.
3.What payment methods are accepted for QS3VH251QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH251QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH251QG?
QS3VH251QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH251QG 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 QS3VH251QG?
For technical support, including QS3VH251QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH251QG requirements.
6.How does Aetrix verify that QS3VH251QG is sourced from the original manufacturer or authorized distributors?
All QS3VH251QG 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 QS3VH251QG meets industry standards.
7.What is the process for return or replacement of QS3VH251QG?
All QS3VH251QG units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH251QG, 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 QS3VH251QG part is unused and in its original packaging.
Return procedure for QS3VH251QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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