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Renesas QS3VH257PAG
- Part No.:
- QS3VH257PAG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
QS3VH257PAG.pdf
- Description:
- IC BUS SWITCH 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,354
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Product details
Overview
QS3VH257PAG from Renesas Electronics (formerly IDT) is a quad 2:1 multiplexer/demultiplexer bus switch with N-channel FET architecture, 4 Ω typical ON resistance, <0.2 ns propagation delay, 5 V I/O tolerance, and rail-to-rail analog switching (0–5 V). It operates from 2.3 V to 3.6 V and is used in hot-swap interfaces and high-speed signal routing in industrial embedded systems.
For engineers reviewing the QS3VH257PAG datasheet, QS3VH257PAG pinout, QS3VH257PAG application, or QS3VH257PAG equivalent, key selection criteria include its 500 MHz bandwidth, LVTTL-compatible control inputs, bidirectional zero-delay operation, -40°C to +85°C temperature range, and TSSOP-20 green package compatibility with high-density PCB layouts.
Technical Context
The QS3VH257PAG implements four independent 2:1 analog/digital bus switches using N-channel FETs without parasitic diodes to VCC, enabling true isolation under power-off conditions and no DC path to supply or ground. Each channel supports bidirectional signal flow with flat RON across input voltage (0–5 V) and maintains <0.2 ns propagation delay at 50 pF load.
Control logic uses active-low Enable (E) and single-bit Select (S) to route between I0x/I1x inputs to Yx outputs. All I/Os tolerate 5 V regardless of VCC (2.3–3.6 V), and undershoot clamp diodes protect all switch and control pins against transient voltages down to –3 V (20 ns pulse).
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 interoperability without level shifters |
| RON (typ) | 4 Ω - Enables low-insertion-loss signal routing for high-fidelity analog or fast digital buses |
| Propagation Delay | <0.2 ns - Adds negligible timing skew in synchronous data paths up to 500 MHz |
| I/O Voltage Tolerance | 0 V to 5 V - Allows interfacing with legacy 5 V logic or mixed-voltage backplanes |
| Off-State Impedance | >1 GΩ - Provides strong channel isolation during disable or hot-swap transitions |
| Input Capacitance (I/O) | 4 pF (typ) - Minimizes capacitive loading on driving sources and preserves signal integrity |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade reliability in uncontrolled ambient environments |
Pinout & Package
QS3VH257PAG is packaged in a 20-pin TSSOP (Thin Shrink Small Outline Package), green RoHS-compliant, with 0.65 mm pitch and body dimensions of 6.5 mm × 4.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I0A–I0D | Data Input (Channel 0) | First set of four bidirectional inputs routed to outputs when S = L |
| I1A–I1D | Data Input (Channel 1) | Second set of four bidirectional inputs routed to outputs when S = H |
| YA–YD | Data Output | Four independent bidirectional output terminals, each connected to one I0x/I1x pair |
| E | Active-Low Enable | Global enable: E = L activates all switches; E = H forces all outputs to high-impedance |
| S | Select Control | Single-bit channel selector: S = L selects I0x; S = H selects I1x |
| VCC | Supply Voltage | Core logic and switch bias supply (2.3–3.6 V); powers internal control circuitry only |
| GND | Ground Reference | Common return for logic and analog signal paths; critical for noise immunity and RON stability |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET switches without parasitic diode to VCC | Enables true power-off isolation and eliminates DC leakage paths to supply or ground |
| Rail-to-rail 0–5 V analog switching | Supports full-swing analog signals and mixed-voltage digital logic without clamping or distortion |
| 5 V tolerant I/Os with undershoot clamp diodes | Protects against –3 V transients (20 ns) and enables robust hot-swap operation in live backplanes |
| Flat RON vs. input voltage | Maintains consistent signal attenuation and impedance matching across entire 0–5 V range |
| Low I/O capacitance (4 pF typ) | Reduces loading on source drivers and preserves edge rates in high-speed serial or parallel buses |
Applications
| Hot-Swappable Backplane Interface | High-Speed Memory Bus Multiplexing |
|---|---|
Use Scenario: Inserting/removing line cards in live telecom or server chassis without powering down the system. IC Role / Device Role / Timing Role: Bidirectional signal bridge between midplane and pluggable card, providing isolation during insertion and low-latency pass-through during operation. Use Value: Enables zero-downtime maintenance via controlled hot-swap sequencing with sub-0.2 ns added delay and 5 V tolerance for legacy interface compatibility. | Use Scenario: Sharing a single DDR memory controller between two memory modules in space-constrained embedded systems. IC Role / Device Role / Timing Role: Quad 2:1 mux routes address/data/control lines from controller to either Module A or Module B based on S/E logic state. Use Value: Eliminates need for dual controllers while preserving signal integrity-4 Ω RON and 4 pF CI/O prevent timing skew or reflection in 200+ MHz memory buses. |
| Analog Signal Routing in Test Equipment | ATM Cell Switching Interface |
Use Scenario: Programmable signal path selection in automated test equipment (ATE) for multi-channel analog stimulus/response measurement. IC Role / Device Role / Timing Role: Low-distortion analog switch enabling precise routing of ±2.5 V sensor signals or DAC outputs without DC offset or gain error. Use Value: Rail-to-rail 0–5 V operation and flat RON ensure <0.01% THD and minimal crosstalk across channels during dynamic reconfiguration. | Use Scenario: Interfacing ATM SAR (Segmentation and Reassembly) controllers to physical layer devices operating at 25 Mbps or 155 Mbps line rates. IC Role / Device Role / Timing Role: High-bandwidth bus switch handling cell header and payload routing between protocol engine and PHY interface. Use Value: 500 MHz bandwidth and bidirectional zero-delay operation support full-rate cell forwarding without pipeline stalls or jitter accumulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 analog/digital bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3257PW | Higher RON (7 Ω typ), narrower VCC range (4.5–5.5 V), no 5 V tolerance at lower VCC | Requires 5 V supply; unsuitable for 2.5 V/3.3 V mixed-voltage systems | Choose only if system runs exclusively at 5 V and higher RON is acceptable |
| PI3CH400QE | Lower bandwidth (300 MHz), no undershoot clamps, 3.3 V only (no 2.5 V support) | Lacks hot-swap protection and dual-voltage flexibility; limited to benign 3.3 V environments | Select when cost is prioritized over robustness and 5 V tolerance is unnecessary |
Compared with SN74CBT3257PW and PI3CH400QE, the QS3VH257PAG uniquely combines 2.5 V/3.3 V operation, 5 V I/O tolerance, undershoot protection, and sub-0.2 ns delay-making it the only option qualified for industrial hot-swap and mixed-voltage backplane routing where signal fidelity and power-off safety are mandatory.
Availability
QS3VH257PAG is available at Aetrix Electronics and suitable for hot-swap backplane interfaces, high-speed memory bus multiplexing, and analog signal routing applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant green packaging.
Supply support for QS3VH257PAG 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 QS3VH257PAG belongs to Renesas' legacy QuickSwitch® bus switch product line-designed specifically for high-bandwidth, low-distortion, hot-swappable signal routing in industrial and telecom systems where zero-delay, power-off isolation, and mixed-voltage interoperability are critical.
FAQ
What is the maximum signal frequency supported by the QS3VH257PAG?
The QS3VH257PAG supports up to 500 MHz bandwidth, verified by its specified small-signal -3 dB point and validated through high-frequency AC characterization. This enables reliable use in DDR memory buses, ATM 155 Mbps interfaces, and other high-speed digital or analog signal paths where minimal phase distortion is required. The QS3VH257PAG achieves this performance due to its 4 Ω RON, 4 pF I/O capacitance, and optimized FET layout-without requiring external termination.
Does the QS3VH257PAG support hot-swap operation with power sequencing?
Yes, the QS3VH257PAG supports safe hot-swap operation due to its N-channel FET architecture with no parasitic diode to VCC, 5 V tolerant I/Os, and undershoot clamp diodes on all pins. When VCC is off, I/Os remain isolated with ±1 μA leakage, preventing back-driving or latch-up. The QS3VH257PAG is explicitly designed for zero-downtime system upgrades per IDT/Renesas application notes on live card insertion.
Can the QS3VH257PAG operate with a 2.5 V supply while interfacing to 5 V signals?
Yes, the QS3VH257PAG operates with VCC as low as 2.3 V and tolerates 0–5 V signals on all I/O pins regardless of supply voltage. This allows direct connection to 5 V legacy peripherals without level shifters. The QS3VH257PAG maintains 4 Ω RON and rail-to-rail switching across the full 0–5 V range, ensuring signal integrity in mixed-voltage systems.
What is the meaning of "rail-to-rail switching" for the QS3VH257PAG?
Rail-to-rail switching means the QS3VH257PAG passes analog or digital signals from 0 V to 5 V without clipping, distortion, or threshold-dependent dropout-even when VCC is as low as 2.5 V. This is achieved via charge-pump-assisted gate drive and optimized FET sizing. For the QS3VH257PAG, this enables accurate transmission of full-scale sensor outputs, DAC waveforms, or TTL/CMOS logic edges across its entire operating range.
Is the QS3VH257PAG pin-compatible with other QuickSwitch devices like QS3VH244 or QS3VH245?
No, the QS3VH257PAG is not pin-compatible with QS3VH244 or QS3VH245. It uses a unique 20-pin TSSOP pinout optimized for quad 2:1 mux/demux functionality (I0x/I1x/Yx/S/E), whereas QS3VH244 is an octal buffer and QS3VH245 is an octal bus transceiver-each with different pin assignments, terminal counts, and signal roles. The QS3VH257PAG pinout is documented in the official Renesas datasheet Figure 1 (Top View).
QS3VH257PAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 4 x 2:1
- 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-TSSOP
QS3VH257PAG FAQ
1.How can I place an order for QS3VH257PAG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH257PAG 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 QS3VH257PAG reliable?
The price and inventory of QS3VH257PAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH257PAG is usually 5 days.
3.What payment methods are accepted for QS3VH257PAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH257PAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH257PAG?
QS3VH257PAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH257PAG 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 QS3VH257PAG?
For technical support, including QS3VH257PAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH257PAG requirements.
6.How does Aetrix verify that QS3VH257PAG is sourced from the original manufacturer or authorized distributors?
All QS3VH257PAG 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 QS3VH257PAG meets industry standards.
7.What is the process for return or replacement of QS3VH257PAG?
All QS3VH257PAG units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH257PAG, 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 QS3VH257PAG part is unused and in its original packaging.
Return procedure for QS3VH257PAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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