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Renesas QS3VH257PAG8
- Part No.:
- QS3VH257PAG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
QS3VH257PAG8.pdf
- Description:
- IC BUS SWITCH 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:220,744
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Product details
Overview
QS3VH257PAG8 from Renesas Electronics (formerly IDT) is a 2.5V/3.3V quad 2:1 multiplexer/demultiplexer bus switch with 4Ω typical ON resistance, <0.2 ns propagation delay, 500 MHz bandwidth, and 5V-tolerant I/Os - deployed in hot-swap interfaces and high-speed memory/data path switching.
For engineers reviewing the QS3VH257PAG8 datasheet, QS3VH257PAG8 pinout, QS3VH257PAG8 application, or QS3VH257PAG8 equivalent, key selection criteria include rail-to-rail analog switching capability, LVTTL-compatible control inputs, industrial temperature operation (–40°C to +85°C), and TSSOP-16 package compatibility with high-density PCB layouts.
Technical Context
The QS3VH257PAG8 implements four independent N-channel FET switches with no parasitic diode to VCC, enabling true isolation under power-off conditions and eliminating DC paths to VCC or GND. Each channel supports bidirectional signal flow with flat RON across 0–5V input range and 5V tolerance in both ON and OFF states.
Control logic uses active-low Enable (E) and single-pole Select (S) per channel group, supporting synchronous 2:1 mux/demux operation. Switching is characterized for 2.3V–3.6V VCC, with tPLH/tPHL ≤ 0.2 ns and tSEL/tEN ≤ 9 ns at 3.3V, making it suitable for sub-nanosecond timing-critical interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports dual-supply systems and mixed-voltage domain bridging |
| RON (Typ.) | 4Ω at VCC = 3V - enables low-insertion-loss analog/digital signal routing |
| Bandwidth | 500 MHz - sustains high-fidelity signal integrity up to 500 MHz fundamental frequency |
| I/O Voltage Tolerance | 0V to 5V - allows interfacing with 5V legacy peripherals without level shifters |
| Propagation Delay | <0.2 ns - contributes negligible timing skew in high-speed data paths |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and telecom equipment |
| CI/O (OFF) | 4 pF typical - minimizes capacitive loading on source and destination buses |
Pinout & Package
Packaged in 16-pin TSSOP (Green, RoHS-compliant), QS3VH257PAG8 features a compact 5 mm × 4.4 mm footprint with 0.65 mm pitch and exposed pad for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I0A–I0D | Data Input 0 (Group A–D) | First input pair per 2:1 channel; accepts 0–5V analog/digital signals |
| I1A–I1D | Data Input 1 (Group A–D) | Second input pair per channel; selectable via S input |
| YA–YD | Data Output (Group A–D) | Bidirectional output node; passes selected input with near-zero delay |
| E | Active-Low Enable | Global enable/disable control; all switches high-impedance when E = HIGH |
| S | Select Input | Chooses between I0x (S = LOW) or I1x (S = HIGH) for all four channels |
| VCC | Supply Voltage | 2.3V–3.6V logic supply; powers internal control circuitry only |
| GND | Ground Reference | Common return for control logic and switch substrate bias |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET architecture with no parasitic diode to VCC | Enables true power-off isolation and prevents back-powering of upstream circuits |
| Rail-to-rail analog switching (0–5V) | Supports full-swing analog signals and mixed-voltage digital logic without clipping |
| 4 pF typical I/O capacitance (OFF state) | Reduces crosstalk and maintains signal rise/fall times in high-speed parallel buses |
| LVTTL-compatible control inputs | Accepts standard 3.3V logic thresholds without external biasing or pull-ups |
| Undershoot clamp diodes on all pins | Protects against –3V transient spikes on I/O and control lines during hot-swap events |
Applications
| Hot-Swappable I/O Card Interface | Memory Bus Multiplexing |
|---|---|
Use Scenario: Pluggable module insertion/removal in live backplane systems without system reset or power interruption. IC Role / Device Role / Timing Role: Bidirectional signal path switch isolating card-side logic from host bus during insertion sequence. Use Value: Prevents bus contention and ground bounce via <0.2 ns delay and high OFF-state impedance (>1 GΩ). | Use Scenario: Sharing a single DDR memory controller between two memory banks using time-multiplexed access. IC Role / Device Role / Timing Role: High-bandwidth 2:1 data path selector enabling dynamic bank routing without added latency. Use Value: 500 MHz bandwidth preserves signal integrity across 200+ MHz memory clocks; 4Ω RON minimizes voltage drop. |
| ATM Cell Switching (25/155 Mbps) | Analog Signal Routing in Test Equipment |
Use Scenario: Low-jitter cell forwarding in telecom line cards handling OC-3 (155 Mbps) or OC-1 (51 Mbps) ATM traffic. IC Role / Device Role / Timing Role: Transparent, low-latency data path switch between PHY and SAR layers. Use Value: Sub-0.2 ns propagation delay avoids bit misalignment; 5V tolerance accommodates legacy PHY signaling. | Use Scenario: Reconfigurable signal path in automated test equipment requiring precise analog channel selection. IC Role / Device Role / Timing Role: Low-distortion analog multiplexer for routing sensor outputs or calibration references. Use Value: Flat RON vs. VIN ensures consistent gain across 0–5V range; 4 pF CI/O preserves bandwidth in >100 MHz measurement paths. |
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 | 4.5Ω RON (typ), 3.3V-only VCC (3.0–3.6V), no 5V I/O tolerance | Limited to 3.3V-only systems; unsuitable for mixed-voltage hot-swap where 5V peripherals connect | Prefer QS3VH257PAG8 when 5V tolerance or wider VCC range is required |
| PI3CH400QE | 5.5Ω RON (typ), 2.5V/3.3V operation, 5V-tolerant I/Os, but 1.2 ns max tPD | Higher propagation delay limits use in sub-1 ns timing-critical paths | Choose QS3VH257PAG8 for applications demanding <0.2 ns delay and minimal timing skew |
Compared with SN74CBT3257PW and PI3CH400QE, QS3VH257PAG8 delivers superior combination of ultra-low delay (<0.2 ns), wide VCC range (2.3–3.6V), and guaranteed 5V I/O tolerance - critical for robust hot-swap and mixed-voltage interoperability where timing margin and voltage flexibility are non-negotiable.
Availability
QS3VH257PAG8 is available at Aetrix Electronics and suitable for hot-swappable I/O modules, memory bus multiplexing, ATM switching infrastructure, and precision analog routing requiring stable component supply across extended industrial temperature ranges.
Supply support for QS3VH257PAG8 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.
QS3VH257PAG8 belongs to the QuickSwitch® family of high-bandwidth bus switches designed specifically for zero-delay signal routing, hot-swap isolation, and voltage-domain bridging in mission-critical industrial and telecom systems.
FAQ
What is the maximum signal voltage the QS3VH257PAG8 can pass in the ON state?
The QS3VH257PAG8 supports rail-to-rail analog switching from 0V to 5V in both ON and OFF states. Its I/O pins are fully 5V tolerant regardless of VCC level (2.3V–3.6V), allowing safe interface with 5V peripherals without external level-shifting circuitry. This capability is confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section of the official datasheet.
Does the QS3VH257PAG8 require external pull-up or pull-down resistors on its control inputs?
No, the QS3VH257PAG8 does not require external pull-up or pull-down resistors on the E or S inputs. Its LVTTL-compatible control inputs have defined VIH (≥2.0V at VCC ≥2.7V) and VIL (≤0.8V) thresholds, and input leakage current is limited to ±1 μA. Direct connection to standard 3.3V logic drivers is sufficient for reliable operation.
Can the QS3VH257PAG8 be used in analog signal paths with minimal distortion?
Yes, the QS3VH257PAG8 is explicitly characterized for low-distortion analog switching. Its flat RON vs. VIN curve (4–6Ω variation over 0–5V), low 4 pF OFF-state capacitance, and absence of parasitic diodes ensure minimal harmonic distortion and signal attenuation - validated in applications like test equipment signal routing and audio/data multiplexing.
What is the thermal performance of the QS3VH257PAG8 in continuous operation?
The QS3VH257PAG8 in TSSOP-16 (PAG) package has a junction-to-ambient thermal resistance (θJA) of 120°C/W. At maximum rated ICCQ (4 mA) and worst-case ambient (85°C), junction temperature remains well below the 150°C storage limit. No heatsink is required for typical operation, but board-level copper pour under the exposed pad improves thermal dissipation.
Is the QS3VH257PAG8 pin-compatible with other members of the QS3VHxxx family?
Yes, the QS3VH257PAG8 shares identical pinout and package dimensions with other TSSOP-16 variants in the QS3VHxxx series (e.g., QS3VH244, QS3VH245). All devices use the same 16-pin layout, control logic conventions (active-low E, single S), and I/O terminal assignments - enabling drop-in replacement within the same package footprint when functional requirements align.
QS3VH257PAG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
QS3VH257PAG8 FAQ
1.How can I place an order for QS3VH257PAG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH257PAG8 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 QS3VH257PAG8 reliable?
The price and inventory of QS3VH257PAG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH257PAG8 is usually 5 days.
3.What payment methods are accepted for QS3VH257PAG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH257PAG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH257PAG8?
QS3VH257PAG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH257PAG8 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 QS3VH257PAG8?
For technical support, including QS3VH257PAG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH257PAG8 requirements.
6.How does Aetrix verify that QS3VH257PAG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH257PAG8 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 QS3VH257PAG8 meets industry standards.
7.What is the process for return or replacement of QS3VH257PAG8?
All QS3VH257PAG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH257PAG8, 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 QS3VH257PAG8 part is unused and in its original packaging.
Return procedure for QS3VH257PAG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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