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Renesas QS3VH251PAG
- Part No.:
- QS3VH251PAG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
QS3VH251PAG.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
QS3VH251PAG from Renesas Electronics (formerly IDT) is a quad 8:1 analog multiplexer/demultiplexer bus switch with N-channel FET architecture, 4Ω typical ON resistance, <0.2 ns propagation delay, 5V-tolerant I/Os, and rail-to-rail 0–5V switching capability. It operates from 2.3V to 3.6V VCC and is used in hot-swap backplane interfaces and high-speed signal routing.
For engineers reviewing the QS3VH251PAG datasheet, QS3VH251PAG pinout, QS3VH251PAG application, or QS3VH251PAG equivalent, key selection criteria include its 500MHz bandwidth, bidirectional zero-delay operation, industrial temperature range (–40°C to +85°C), LVTTL-compatible control inputs, and TSSOP-24 green package compatibility.
Technical Context
The QS3VH251PAG implements four independent 8:1 analog MUX/DEMUX channels using N-channel FET switches without parasitic diodes to VCC-enabling true isolation during power-off and eliminating DC paths to VCC or GND. Each channel supports 5V-tolerant signal handling regardless of VCC state.
Its control logic uses active-low Enable (E) and 3-bit binary Select (S2–S0) per channel, with propagation delays under 0.2 ns and disable/enable times ≤9 ns across –40°C to +85°C. The device exhibits flat RON over voltage and temperature, matched channel resistance (<1Ω mismatch), and 4pF typical OFF-state demux capacitance.
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 shifting |
| RON (Typ.) | 4Ω at VCC = 3V - enables low-insertion-loss analog/data path with minimal signal distortion |
| Propagation Delay | <0.2 ns - contributes negligible timing skew in high-speed parallel bus or clock distribution |
| Bandwidth | Up to 500MHz - suitable for DDR2/DDR3 address/control routing and video signal switching |
| I/O Voltage Tolerance | –0.5V to +5.5V - allows safe interfacing with 5V logic or analog sources while powered from 2.5V/3.3V |
| OFF-State Capacitance | 4pF typical - minimizes crosstalk and loading on adjacent high-frequency traces |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and telecom infrastructure use |
Pinout & Package
QS3VH251PAG is packaged in a 24-pin TSSOP (Thin Shrink Small Outline Package), green RoHS-compliant, with 0.65 mm pitch and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I0–I7 | Data Inputs (per channel) | Eight bidirectional analog/digital input terminals per MUX/DEMUX section; tolerate up to 5.5V regardless of VCC |
| Y | Data Output (per channel) | Single bidirectional output per channel; connects to selected Ix when E = L and S2–S0 match index |
| S0–S2 | Select Inputs | 3-bit binary address controlling channel routing; LVTTL-compatible, VIH ≥ 2.0V at VCC ≥ 2.7V |
| E | Enable Input | Active-low global enable; all channels disabled (high-Z) when E = H; no current draw in disabled state |
| VCC | Power Supply | Core logic and gate drive supply; must be decoupled locally due to fast switching transients |
| GND | Ground Reference | Common return for logic and analog paths; separate ground plane recommended for noise-sensitive applications |
Key Features
| Feature | Design Value |
|---|---|
| N-channel FET switches without parasitic diodes | Enables true power-off isolation and eliminates latch-up risk when interfacing mixed-voltage domains |
| Rail-to-rail 0–5V analog switching | Preserves full dynamic range of sensor, audio, or video signals without clipping or distortion |
| Under-shoot clamp diodes on all I/Os | Protects internal circuitry from transient negative excursions down to –3V (20ns pulse) |
| Flat RON vs. VIN characteristic | Maintains consistent signal attenuation across input voltage swing-critical for precision analog multiplexing |
| High OFF impedance (>1 GΩ typical) | Prevents signal leakage between unselected channels, enabling clean channel separation in multi-source systems |
Applications
| Hot-Swappable Backplane Interface | ATM Cell Switching |
|---|---|
Use Scenario: Inserting/removing line cards in live telecom chassis without disrupting upstream/downstream data flow. IC Role / Device Role / Timing Role: Bidirectional 8:1 MUX/DEMUX acting as hot-swap arbitration switch between backplane and card-local logic. Use Value: Enables zero-downtime maintenance via 5V-tolerant I/Os, power-off isolation, and sub-0.2 ns delay-preserving cell timing integrity. | Use Scenario: Routing ATM 25/155 Mbps data cells between multiple physical ports in access concentrators. IC Role / Device Role / Timing Role: High-bandwidth analog switch performing non-blocking port selection with deterministic latency. Use Value: 500MHz bandwidth and matched RON ensure bit-error-free transmission at OC-3/OC-12 rates without equalization. |
| Low-Distortion Sensor Multiplexing | Legacy Bus Signal Re-Routing |
Use Scenario: Consolidating outputs from eight precision temperature or pressure sensors into a single ADC input. IC Role / Device Role / Timing Role: Rail-to-rail analog MUX providing unity-gain, low-THD signal path with minimal offset drift. Use Value: 4Ω RON and 4pF OFF capacitance minimize gain error and settling time degradation across sensor channels. | Use Scenario: Adapting legacy 5V parallel bus signals (e.g., ISA, PC/104) to modern 3.3V microcontroller peripherals. IC Role / Device Role / Timing Role: Level-flexible bus switch enabling voltage-domain bridging without external translators. Use Value: 5V-tolerant I/Os and 2.3–3.6V VCC operation eliminate need for discrete level shifters in retrofit designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer/switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16251DGGR | 16-bit, 2:1 bus switch; 5Ω RON; 3.3V-only VCC; no 5V tolerance on I/Os | Designed for wide-bus digital switching, not high-precision analog or mixed-voltage routing | Choose only for pure 3.3V digital bus expansion where 5V tolerance is unnecessary |
| MAX4617ESE+ | Single 8:1 MUX; 100Ω RON; 12V max VCC; ±15V analog range; slower (25ns tPD) | Targeted at high-voltage industrial instrumentation, not high-speed telecom or computing interfaces | Prefer for ±10V sensor front-ends requiring wide supply headroom, not low-latency digital routing |
Compared with SN74CBT16251DGGR and MAX4617ESE+, the QS3VH251PAG uniquely combines quad 8:1 topology, 4Ω RON, 500MHz bandwidth, and 5V I/O tolerance on a 2.5V/3.3V supply-making it optimal for space-constrained, high-density hot-swap and ATM switching applications where latency, voltage flexibility, and channel count are critical.
Availability
QS3VH251PAG is available at Aetrix Electronics and suitable for hot-swappable backplane interfaces, ATM 25/155 switching systems, and low-distortion analog multiplexing requiring stable component supply across extended temperature ranges.
Supply support for QS3VH251PAG 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 QS3VH251PAG belongs to Renesas' legacy QuickSwitch® analog bus switch family-designed specifically for high-bandwidth, low-latency signal routing in telecom, computing, and industrial hot-swap systems.
FAQ
What is the maximum signal voltage the QS3VH251PAG can handle when VCC = 0V?
The QS3VH251PAG supports 5V-tolerant I/Os even when unpowered: its absolute maximum DC switch voltage (VS) is –0.5V to +5.5V, and data pins tolerate –0.5V to +5.5V regardless of VCC state. This enables safe hot-insertion into live 5V buses. The QS3VH251PAG achieves this via N-channel FETs with no parasitic diode to VCC, ensuring true isolation and zero DC path to supply or ground.
Does the QS3VH251PAG support bidirectional signal flow?
Yes, the QS3VH251PAG supports fully bidirectional operation-signals pass equally well from Ix to Y or Y to Ix with identical electrical characteristics. Its N-channel FET architecture provides symmetrical RON and capacitance, and propagation delay remains under 0.2 ns in either direction. This makes the QS3VH251PAG ideal for shared bus architectures and bidirectional test equipment interfaces.
What is the function of the undershoot clamp diodes in the QS3VH251PAG?
The QS3VH251PAG integrates undershoot clamp diodes on all switch and control inputs to protect against negative transient excursions down to –3V for pulses ≤20 ns. These diodes shunt energy to GND, preventing gate oxide stress or latch-up during ESD events or signal reflections. This feature enhances robustness in noisy industrial or hot-swap environments where the QS3VH251PAG is commonly deployed.
Can the QS3VH251PAG operate reliably at 2.5V VCC?
Yes, the QS3VH251PAG is fully specified for 2.5V ±0.2V operation: VIH is guaranteed ≥1.7V, RON is 7Ω typical, and switching parameters (tPLH/tPHL ≤0.2 ns) remain valid across –40°C to +85°C. Its 2.3V to 3.6V VCC range ensures compatibility with both 2.5V and 3.3V systems without redesign. The QS3VH251PAG maintains performance consistency across this range due to flat RON vs. VIN behavior.
Is the QS3VH251PAG pin-compatible with other devices in the QS3VHxxx family?
Yes, the QS3VH251PAG shares identical pinout and footprint with other TSSOP-24 variants in the QS3VHxxx series-including QS3VH244, QS3VH245, and QS3VH257-enabling drop-in replacement within the same package variant. All share common VCC, GND, E, S0–S2, and I0–I7/Y pin assignments. However, functional differences (e.g., 2:1 vs. 8:1, demux-only vs. mux/demux) require logic-level verification before substitution. The QS3VH251PAG's specific 8:1 quad configuration is preserved across these compatible footprints.
QS3VH251PAG 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:
- 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-TSSOP
QS3VH251PAG FAQ
1.How can I place an order for QS3VH251PAG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH251PAG 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 QS3VH251PAG reliable?
The price and inventory of QS3VH251PAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH251PAG is usually 5 days.
3.What payment methods are accepted for QS3VH251PAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH251PAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH251PAG?
QS3VH251PAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH251PAG 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 QS3VH251PAG?
For technical support, including QS3VH251PAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH251PAG requirements.
6.How does Aetrix verify that QS3VH251PAG is sourced from the original manufacturer or authorized distributors?
All QS3VH251PAG 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 QS3VH251PAG meets industry standards.
7.What is the process for return or replacement of QS3VH251PAG?
All QS3VH251PAG units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH251PAG, 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 QS3VH251PAG part is unused and in its original packaging.
Return procedure for QS3VH251PAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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