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Renesas QS3VH861QG
- Part No.:
- QS3VH861QG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH861QG.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,869
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Product details
Overview
QS3VH861QG from Renesas Electronics (formerly IDT) is a 10-bit high-bandwidth bus switch with flow-through pinout, designed for hot-swap and high-speed data routing. It features 4Ω typical ON resistance, <0.2ns propagation delay, 5V-tolerant I/Os, rail-to-rail switching (0–5V), and operates from 2.3V to 3.6V VCC. It is used in Fast Ethernet LAN switches and live-insertion backplane interfaces.
For engineers reviewing the QS3VH861QG datasheet, QS3VH861QG pinout, QS3VH861QG application, or QS3VH861QG equivalent, key selection criteria include its 500MHz bandwidth, bidirectional zero-delay signal path, industrial temperature range (–40°C to +85°C), LVTTL-compatible BE control, and QSOP-24 package compatibility with hot-swap system architectures.
Technical Context
The QS3VH861QG implements N-channel FET switches without parasitic diodes to VCC, enabling true isolation during power-off and eliminating DC paths to VCC or GND. Its 5V tolerance in both ON and OFF states supports mixed-voltage system interfacing across legacy and modern logic domains.
Control is via active-low BE input with LVTTL-compatible thresholds; switching behavior is bidirectional with flat RON over voltage and temperature, and excellent channel-to-channel RON matching ensures signal integrity in parallel bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports dual-supply 2.5V/3.3V systems without level shifters |
| RON (Typ.) | 4Ω at VCC = 3V - enables low-loss signal transmission up to 500MHz bandwidth |
| Propagation Delay | <0.2ns - adds negligible latency in high-speed data paths like 100Base-TX |
| I/O Voltage Tolerance | 0V to 5.5V - allows safe interfacing with 5V peripherals while powered from 3.3V |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and networking equipment |
| Input Capacitance | 4pF (switch OFF) - minimizes loading on driving sources and preserves edge rates |
| Enable Frequency | Up to 20MHz (BE toggle) - supports dynamic reconfiguration in real-time bus arbitration |
Pinout & Package
QS3VH861QG is housed in a 24-pin QSOP (Quarter-Size Outline Package) with 0.635mm pitch, RoHS-compliant and green (lead-free) construction per ordering code QG.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BE | Active-Low Bus Enable | Asserting LOW connects A0–A9 ↔ B0–B9; HIGH places all channels in high-Z |
| A0–A9 | Bus A Input/Output | Bidirectional signal terminals; 5V-tolerant, 4pF capacitance when OFF |
| B0–B9 | Bus B Input/Output | Mirror-symmetric counterpart to A-side; flow-through layout minimizes trace skew |
| VCC | Positive Supply | 2.3V–3.6V logic supply; powers internal control circuitry only (no current through switch path) |
| GND | Ground Reference | Common return for control logic and switch substrate; decoupling critical for noise immunity |
| NC | No Connect | Pin 1 (top-left corner, top view) is unconnected - must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Supports 0–5V signal swing without clipping or distortion - ideal for mixed-signal hot-swap interfaces |
| No parasitic diode to VCC | Eliminates unintended current paths during power sequencing - enables safe live insertion/removal |
| Undershoot clamp diodes | Protects all switch and control pins from –3V transients - enhances robustness in noisy industrial environments |
| Flat RON vs. VIN | RON variation <±0.5Ω across 0–5V input range - maintains consistent impedance and timing in analog/data paths |
| High OFF impedance | >10⁹Ω isolation - prevents crosstalk and leakage between inactive buses in multi-drop configurations |
Applications
| Hot-Swappable Backplane Interface | Fast Ethernet (100Base-TX) Switching |
|---|---|
Use Scenario: Live insertion of line cards into carrier boards without powering down the system. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-local logic (3.3V) from backplane (5V) during insertion/removal. Use Value: Prevents bus contention and ground bounce; enables zero-downtime maintenance in telecom infrastructure. | Use Scenario: Signal routing between PHY and MAC layers in 100Mbps Ethernet switches. IC Role / Device Role / Timing Role: Low-latency, high-fidelity data path switch with sub-0.2ns delay and 500MHz bandwidth. Use Value: Preserves signal integrity across twisted-pair interfaces; eliminates timing skew in parallel MDI-X paths. |
| Analog Signal Multiplexing | Legacy-to-Modern Logic Interface |
Use Scenario: Routing low-distortion analog sensor signals in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Low-RON, rail-to-rail analog switch replacing mechanical relays in programmable gain stages. Use Value: Delivers <0.01% THD+N and no charge injection - critical for 16-bit ADC front-end conditioning. | Use Scenario: Interfacing 5V microcontrollers with 3.3V FPGA I/O banks in mixed-voltage control systems. IC Role / Device Role / Timing Role: Level-agnostic bidirectional translator with 5V-tolerant inputs and 3.3V-switched outputs. Use Value: Eliminates external level shifters; reduces BOM count and PCB area in motor drive control boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16210DGGR | 16-bit, 3.3V-only VCC (no 2.5V support); higher RON (6Ω typ.); no undershoot clamps | Limited to 3.3V-only systems; less robust against ESD transients on switch nodes | Prefer when board uses only 3.3V rails and cost sensitivity outweighs transient protection needs |
| PI3CHD1012LEX | 10-bit, 3.3V VCC; 5V-tolerant I/Os; RON = 5Ω typ.; lacks industrial temp rating (0°C to +70°C only) | Not qualified for extended temperature operation; unsuitable for outdoor or factory-floor deployments | Select only for commercial-grade consumer electronics where ambient temperature stays below 70°C |
Compared with SN74CBT16210DGGR and PI3CHD1012LEX, the QS3VH861QG uniquely combines 2.5V/3.3V dual-supply flexibility, –40°C to +85°C qualification, integrated undershoot clamps, and lowest RON (4Ω) - making it the optimal choice for ruggedized hot-swap and industrial Ethernet designs.
Availability
QS3VH861QG is available at Aetrix Electronics and suitable for hot-swappable backplane interfaces, Fast Ethernet switching infrastructure, industrial analog multiplexing, and mixed-voltage logic bridging requiring stable component supply across long production lifecycles.
Supply support for QS3VH861QG 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 IoT applications.
The QS3VH861QG belongs to Renesas' QuickSwitch® bus switch product line, engineered specifically for high-bandwidth, low-latency, hot-pluggable data routing in industrial and networking systems.
FAQ
What is the maximum signal frequency supported by the QS3VH861QG?
The QS3VH861QG supports up to 500MHz bandwidth, verified by small-signal AC analysis and measured under 50Ω termination. This enables reliable use in Fast Ethernet (100Base-TX) and parallel bus applications where rise times are ≤700ps. The QS3VH861QG achieves this performance due to its 4Ω typical RON and 4pF OFF-state capacitance, yielding an RC time constant well below 0.2ns.
Does the QS3VH861QG require external level shifters when interfacing 5V and 3.3V domains?
No, the QS3VH861QG does not require external level shifters. Its I/Os are fully 5V-tolerant in both ON and OFF states, and it operates from a 2.3V–3.6V VCC supply. This allows direct connection between 5V peripherals and 3.3V logic without signal degradation or damage risk - a core design feature confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the official datasheet.
How does the QS3VH861QG ensure signal integrity during hot-swap events?
The QS3VH861QG ensures signal integrity during hot-swap events via three integrated mechanisms: (1) N-channel FETs with no parasitic diode to VCC, preventing back-powering; (2) undershoot clamp diodes on all switch and control pins, limiting negative transients to –3V; and (3) >10⁹Ω OFF-state impedance, eliminating leakage paths. These features are explicitly documented in the Features and Absolute Maximum Ratings sections of the QS3VH861QG datasheet.
What is the propagation delay of the QS3VH861QG, and how is it measured?
The QS3VH861QG has a maximum propagation delay of 0.2ns (tPLH/tPHL), measured under load conditions of CL = 50pF, VCC = 3.3V, and VIN = 0V to 2.4V transitions. This value reflects the intrinsic RC delay of the 4Ω RON and load capacitance - not added gate delay - and is validated in the Switching Characteristics table. The QS3VH861QG contributes effectively zero deterministic delay to system timing budgets.
Is the QS3VH861QG pin-compatible with other QuickSwitch devices like the QS3VH245?
No, the QS3VH861QG is not pin-compatible with the QS3VH245. The QS3VH861QG is a 10-bit flow-through device in QSOP-24 with dedicated A0–A9/B0–B9 pairs and single BE control, whereas the QS3VH245 is an 8-bit non-inverting buffer in TSSOP-20 with separate OE and direction controls. Pin mapping, pin count, and functional architecture differ fundamentally - confirmed by comparing their respective Pin Configuration diagrams and Function Tables in official Renesas documentation.
QS3VH861QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 10 x 1:1
- 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:
- 24-QSOP
QS3VH861QG FAQ
1.How can I place an order for QS3VH861QG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH861QG 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 QS3VH861QG reliable?
The price and inventory of QS3VH861QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH861QG is usually 5 days.
3.What payment methods are accepted for QS3VH861QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH861QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH861QG?
QS3VH861QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH861QG 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 QS3VH861QG?
For technical support, including QS3VH861QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH861QG requirements.
6.How does Aetrix verify that QS3VH861QG is sourced from the original manufacturer or authorized distributors?
All QS3VH861QG 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 QS3VH861QG meets industry standards.
7.What is the process for return or replacement of QS3VH861QG?
All QS3VH861QG units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH861QG, 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 QS3VH861QG part is unused and in its original packaging.
Return procedure for QS3VH861QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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