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Renesas QS3VH257S1G
- Part No.:
- QS3VH257S1G
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH257S1G.pdf
- Description:
- IC BUS SWITCH 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,524
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Product details
Overview
QS3VH257S1G 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, and 5V-tolerant I/Os. It operates from –40°C to +85°C and supports rail-to-rail analog switching (0–5V) in hot-swap and high-speed communication interfaces.
For engineers reviewing the QS3VH257S1G datasheet, QS3VH257S1G pinout, QS3VH257S1G application, or QS3VH257S1G equivalent, key selection criteria include its LVTTL-compatible control inputs, 500MHz bandwidth, bidirectional zero-delay signal path, high OFF-state impedance (>1 GΩ), and SOIC-16 green package compatibility with industrial PCB layouts.
Technical Context
The QS3VH257S1G implements four independent N-channel FET switches without parasitic diodes to VCC, enabling true isolation during power-off and eliminating DC paths to VCC or GND. Its enable (E) and select (S) logic controls channel routing with LVTTL-compatible thresholds and undershoot clamp diodes on all I/Os.
Each switch delivers flat RON across 0–5V input range and matches within ±0.5Ω between channels. The device supports both multiplexing (I0/I1 → Y) and demultiplexing (Y → I0/I1) modes with identical timing-tPLH/tPHL ≤ 0.2 ns at VCC = 3.3V and CL = 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports dual-supply 2.5V and 3.3V system domains without level shifters |
| RON (Typ) | 4Ω at VCC = 3V - minimizes insertion loss and distortion in analog/RF signal paths |
| Propagation Delay | <0.2 ns - enables sub-nanosecond timing-critical routing in high-speed backplanes |
| I/O Voltage Tolerance | –0.5V to +5.5V - allows safe interfacing with 5V signals while powered from 3.3V or 2.5V |
| Bandwidth | 500 MHz - supports DDR2/DDR3 address/control bus switching and ATM 25/155 applications |
| Off-State Leakage | ±1 μA max - ensures signal integrity during hot-swap insertion with no crosstalk or feedthrough |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded controllers and telecom line cards |
Pinout & Package
QS3VH257S1G is packaged in a 16-pin SOIC (Small Outline Integrated Circuit) green RoHS-compliant body (JEDEC MS-012AC), 7.5 mm × 10.3 mm footprint, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I0A–I0D | Data Input 0 (Channel A–D) | First input pair per 2:1 mux; accepts 0–5V analog/digital signals regardless of VCC |
| I1A–I1D | Data Input 1 (Channel A–D) | Second input pair; selected when S = HIGH and E = LOW |
| YA–YD | Data Output (Channel A–D) | Bidirectional node - functions as output in mux mode, input in demux mode |
| S | Select Control Input | LVTTL-compatible; selects I0x (S = LOW) or I1x (S = HIGH) when E = LOW |
| E | Enable Control Input | Active-LOW enable; all outputs enter high-impedance state when E = HIGH |
| VCC | Supply Voltage | 2.3–3.6V logic supply; powers internal control circuitry only - no current sourced to I/O paths |
| GND | Ground Reference | Common return for control logic and switch substrate; isolated from I/O signal ground paths |
Key Features
| Feature | Design Value |
|---|---|
| No parasitic diode to VCC | Enables true power-off isolation: zero DC path between I/O pins and VCC/GND during standby |
| Rail-to-rail switching | Supports full 0–5V analog swing with flat RON - preserves signal fidelity in sensor front-ends and audio paths |
| Undershoot clamp diodes | Protects all switch and control pins against –3V transient spikes - critical for live-insertion systems |
| Low I/O capacitance | 4 pF typical (switch OFF) - reduces loading on high-impedance drivers and preserves signal edge rates |
| RON matching | ≤0.5Ω channel-to-channel variation - ensures consistent timing and amplitude across all four mux paths |
Applications
| Hot-Swappable I/O Card Interface | High-Speed Memory Bus Multiplexing |
|---|---|
Use Scenario: Live insertion/removal of peripheral cards in telecom chassis without powering down the backplane. IC Role / Device Role / Timing Role: Bidirectional signal gate isolating card-side logic from main system bus during plug/unplug events. Use Value: Prevents bus contention and voltage glitches using 5V-tolerant I/Os and <0.2 ns delay - zero downtime guaranteed. | Use Scenario: Sharing a single DDR2 memory controller between two independent processor modules. IC Role / Device Role / Timing Role: Quad 2:1 mux routing address/control lines from either CPU to shared DRAM bank. Use Value: Maintains signal integrity at 400+ MHz with 4Ω RON and 500MHz bandwidth - eliminates need for active repeaters. |
| Analog Signal Path Switching | ATM Cell Switching Interface |
Use Scenario: Reconfigurable test equipment selecting between multiple sensor inputs feeding an ADC. IC Role / Device Role / Timing Role: Low-distortion analog switch enabling rail-to-rail 0–5V signal routing with minimal THD. Use Value: 4Ω RON and flat response preserve SNR; 1 GΩ OFF impedance prevents channel crosstalk. | Use Scenario: Line-card interface in ATM 25/155 Mbit/s network switches handling cell header routing. IC Role / Device Role / Timing Role: High-bandwidth digital bus switch selecting between upstream/downstream SAR or FIFO paths. Use Value: Sub-ns propagation delay and 500MHz bandwidth meet SONET/SDH jitter budgets without retiming. |
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 |
|---|---|---|---|
| SN74CBT3257DR | 4.5Ω RON, 3.3V-only VCC (3.0–3.6V), no 5V tolerance on I/Os | Not suitable for mixed-voltage hot-swap where 5V signals coexist with 3.3V logic | Prefer QS3VH257S1G when 5V-tolerant I/Os or industrial temperature range are required. |
| PI3CH480QS | 6Ω RON, 2.5V/3.3V operation, but only 3.6V max I/O voltage (no 5V tolerance) | Limited to 3.3V-system-only designs; lacks undershoot clamps and rail-to-rail analog capability | QS3VH257S1G remains superior for legacy 5V peripheral interfacing and zero-distortion analog switching. |
Compared with SN74CBT3257DR and PI3CH480QS, the QS3VH257S1G uniquely combines 5V I/O tolerance, –40°C to +85°C operation, sub-0.2 ns delay, and true power-off isolation - making it the only option qualified for telecom hot-swap and mixed-voltage industrial backplanes.
Availability
QS3VH257S1G is available at Aetrix Electronics and suitable for hot-swappable I/O card interfaces, high-speed memory bus multiplexing, and analog signal path switching requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for QS3VH257S1G 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 QS3VH257S1G belongs to Renesas' legacy QuickSwitch® bus switch product line, originally developed by IDT to solve high-bandwidth, low-distortion signal routing challenges in telecom, computing, and test equipment.
FAQ
What is the maximum I/O voltage rating for QS3VH257S1G?
The QS3VH257S1G supports DC input voltages from –0.5V to +5.5V on all switch and control pins, enabling safe interfacing with 5V signals even when powered from 2.5V or 3.3V. This 5V tolerance applies in both ON and OFF states and is verified per Absolute Maximum Ratings table in the official datasheet.
Does QS3VH257S1G require external pull-up or pull-down resistors on control inputs?
No, QS3VH257S1G does not require external biasing on S or E inputs. Its LVTTL-compatible control thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC = 3.3V) ensure clean logic recognition with standard CMOS drivers. Internal clamping diodes further protect against undershoot without needing external components.
Can QS3VH257S1G be used for analog signal switching?
Yes, QS3VH257S1G is explicitly designed for low-distortion analog switching: it supports rail-to-rail 0–5V signals, exhibits flat 4Ω RON across the full input range, and provides >1 GΩ OFF-state impedance. Its lack of parasitic diodes to VCC ensures no signal clipping or DC offset in sensor, audio, or test equipment signal chains.
What is the thermal performance of QS3VH257S1G in continuous operation?
QS3VH257S1G is characterized for continuous operation from –40°C to +85°C ambient temperature. Its quiescent supply current is only 2 mA typical (4 mA max), and dynamic ICCD remains below 8 mA at 20 MHz toggle rate - resulting in negligible self-heating (<1°C rise) in SOIC-16 packages under standard PCB copper pour conditions.
Is QS3VH257S1G pin-compatible with other QuickSwitch devices?
QS3VH257S1G shares the same 16-pin SOIC pinout as QS3VH244, QS3VH245, and QS3VH251 variants, but functional compatibility requires verification per signal routing and enable logic. For example, QS3VH257S1G uses active-LOW E and single-bit S select, whereas QS3VH244 uses dual-OE control - direct substitution is not assured without schematic review.
QS3VH257S1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
QS3VH257S1G FAQ
1.How can I place an order for QS3VH257S1G through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH257S1G 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 QS3VH257S1G reliable?
The price and inventory of QS3VH257S1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH257S1G is usually 5 days.
3.What payment methods are accepted for QS3VH257S1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH257S1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH257S1G?
QS3VH257S1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH257S1G 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 QS3VH257S1G?
For technical support, including QS3VH257S1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH257S1G requirements.
6.How does Aetrix verify that QS3VH257S1G is sourced from the original manufacturer or authorized distributors?
All QS3VH257S1G 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 QS3VH257S1G meets industry standards.
7.What is the process for return or replacement of QS3VH257S1G?
All QS3VH257S1G units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH257S1G, 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 QS3VH257S1G part is unused and in its original packaging.
Return procedure for QS3VH257S1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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