My Inquiry
My Account
Renesas QS3VH125QG8
- Part No.:
- QS3VH125QG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3VH125QG8.pdf
- Description:
- IC BUS SWITCH 1 X 4:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,610
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
QS3VH125QG8 from Renesas Electronics (formerly IDT) is a quad, active-low, high-bandwidth bus switch IC designed for bidirectional signal routing in hot-swap and Ethernet switching systems. It operates from 2.3V to 3.6V VCC, delivers ≤250ps propagation delay, 4Ω typical ON resistance, 500MHz bandwidth, and supports rail-to-rail 0–5V analog/digital signal switching.
For engineers reviewing the QS3VH125QG8 datasheet, QS3VH125QG8 pinout, QS3VH125QG8 application, or QS3VH125QG8 equivalent, key selection criteria include its LVTTL-compatible active-low OE control, 5V-tolerant I/Os with no parasitic diode to VCC, flat RON over voltage range, and isolation under power-off conditions - critical for live-insertion and mixed-voltage interconnects.
Technical Context
The QS3VH125QG8 implements four independent N-channel FET switches with undriven gate control via individual active-low Output Enable (1OE–4OE) inputs. Each channel provides true bidirectional conduction with near-zero ground bounce and no added propagation delay beyond RC time constant (~0.2ns at 50pF load).
It features undershoot clamp diodes on all switch and control pins, 4pF typical OFF-state I/O capacitance, and guaranteed 5V tolerance on A/Y terminals regardless of VCC state - enabling safe interfacing between 3.3V logic and 5V legacy buses without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports both 2.5V and 3.3V system rails with single supply |
| RON (Typ.) | 4Ω at VCC = 3V, VIN = 0V - enables low-loss signal pass-through with minimal voltage drop |
| Bandwidth | Up to 500MHz - suitable for Fast Ethernet (100BASE-TX) and ATM 25/155 physical layer switching |
| Propagation Delay | ≤250ps - preserves signal integrity in high-speed digital and analog multiplexing |
| I/O Voltage Tolerance | 0V to 5.5V on A/Y pins - allows interoperability across 3.3V logic and 5V analog or legacy interfaces |
| OFF-State Isolation | >10⁹Ω - ensures signal blocking and channel separation when disabled, even with VCC = 0V |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded and networking equipment |
Pinout & Package
QS3VH125QG8 is housed in a 16-pin QSOP (Quarter-Size Outline Package) with 0.150" body width and standard 0.025" lead pitch. Pin 1 is marked by notch or dot; Pin 9 is GND, Pin 16 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A–4A | Switch Input/Output Terminal A | Bidirectional data port A side; 5V tolerant, 4pF capacitance, connects to source/load when OE active |
| 1Y–4Y | Switch Input/Output Terminal Y | Bidirectional data port Y side; electrically identical to A pins, enables full bus isolation or mirroring |
| 1OE–4OE | Active-Low Output Enable | Individual channel control; LOW enables path, HIGH forces Hi-Z; LVTTL-compatible thresholds |
| VCC | Power Supply | 2.3V–3.6V core supply; powers internal logic and gate drive; not connected to switch channel paths |
| GND | Ground Reference | Signal and power return; decoupling required near Pin 9 for noise-sensitive high-frequency operation |
Key Features
| Feature | Design Value |
|---|---|
| No parasitic diode to VCC | Enables true power-off isolation: zero DC path between A/Y terminals when VCC = 0V |
| Rail-to-rail analog switching | Supports 0–5V continuous signal swing without clipping or distortion - ideal for audio and sensor interfaces |
| Flat RON vs. VIN | RON variation <1Ω across 0–5V input range - ensures consistent signal attenuation and timing in mixed-signal paths |
| Undershoot clamp diodes | Protects all A/Y and OE pins from −3V transient spikes - eliminates need for external TVS in hot-swap connectors |
| Low I/O capacitance | 4pF typical OFF-state capacitance - minimizes loading on high-impedance sources and preserves rise/fall times |
Applications
| Hot-Swappable Module Interface | Fast Ethernet LAN Switching |
|---|---|
Use Scenario: Insertion/removal of line cards or peripheral modules while system remains powered and operational. IC Role / Device Role / Timing Role: Bidirectional signal isolator and voltage-domain bridge between backplane (5V) and card-edge logic (3.3V). Use Value: Prevents bus contention and ground bounce during insertion; maintains signal integrity via 4Ω RON and 500MHz bandwidth. | Use Scenario: Signal routing between PHY and MAC layers in 10/100BASE-TX Ethernet switches. IC Role / Device Role / Timing Role: Low-latency, low-distortion bus switch enabling MII/RMII interface multiplexing and PHY selection. Use Value: ≤250ps propagation delay and flat RON ensure deterministic timing alignment across differential pairs. |
| Analog Signal Multiplexing | Legacy System Voltage Translation |
Use Scenario: Routing multiple sensor or audio signals to shared ADC or amplifier inputs in industrial controllers. IC Role / Device Role / Timing Role: Rail-to-rail analog switch with 0–5V support and low THD. Use Value: 4pF OFF capacitance and 4Ω RON minimize crosstalk and signal degradation in multi-channel analog front ends. | Use Scenario: Interfacing modern 3.3V microcontrollers with legacy 5V peripherals (e.g., EEPROMs, DACs) without discrete level shifters. IC Role / Device Role / Timing Role: Passive, direction-agnostic voltage-tolerant switch enabling protocol-transparent bridging. Use Value: 5V tolerance on A/Y pins and no VCC dependency allow safe 3.3V-controlled access to 5V buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16212DGGR | Higher RON (6Ω typ.), wider VCC range (4.5–5.5V), no 5V tolerance on I/O when VCC = 3.3V | Requires external clamping for hot-swap transients; limited to 5V-only systems | Select when operating exclusively at 5V and higher drive strength is needed |
| PI3CH480QE | Lower bandwidth (350MHz), no undershoot clamps, 3.3V-only I/O tolerance | Not suitable for mixed-voltage hot-swap or 5V legacy interfacing without additional protection | Prefer for cost-sensitive 3.3V-only designs where 500MHz bandwidth is unnecessary |
Compared with SN74CBT16212DGGR and PI3CH480QE, the QS3VH125QG8 uniquely combines 5V I/O tolerance at 3.3V VCC, integrated undershoot clamps, and 500MHz bandwidth - making it the only option qualified for industrial hot-swap and Fast Ethernet physical-layer switching without supplemental circuitry.
Availability
QS3VH125QG8 is available at Aetrix Electronics and suitable for hot-swapping, Fast Ethernet LAN switching, analog multiplexing, and legacy voltage translation requiring stable component supply and long-term industrial temperature support.
Supply support for QS3VH125QG8 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 QS3VH125QG8 belongs to Renesas' legacy QuickSwitch® bus switch family, originally developed by IDT to address high-speed, low-distortion signal routing needs in communications and hot-plug systems.
FAQ
What is the maximum signal voltage the QS3VH125QG8 can switch?
The QS3VH125QG8 supports rail-to-rail switching from 0V to 5V on its A and Y terminals, with guaranteed 5V tolerance in both ON and OFF states - even when VCC is powered at 2.3V–3.6V. This allows safe interfacing between 3.3V logic controllers and 5V analog or legacy digital buses without external level-shifting circuitry. The device's N-channel FET architecture and absence of parasitic diodes to VCC ensure no unintended current paths during overvoltage conditions.
Does the QS3VH125QG8 require external clamping diodes for hot-swap protection?
No, the QS3VH125QG8 integrates undershoot clamp diodes on all A, Y, and OE pins, rated for −3V transient pulses. This built-in protection eliminates the need for external TVS devices in hot-swap applications such as pluggable network cards or modular I/O interfaces. The clamps operate independently of VCC, maintaining protection even during power-up/down sequences where VCC is unstable or absent - a key reliability feature confirmed in the device's Absolute Maximum Ratings table.
What is the typical ON-resistance variation across input voltage for the QS3VH125QG8?
The QS3VH125QG8 exhibits flat RON characteristics: typical ON resistance varies less than ±0.5Ω across the full 0–5V input range at VCC = 3.3V, as shown in the "Typical ON Resistance vs VIN" graph. This consistency ensures uniform signal attenuation and minimal harmonic distortion in analog applications, and predictable timing behavior in digital bus switching - unlike many competing switches whose RON rises significantly near rail extremes.
Can the QS3VH125QG8 be used in bidirectional analog signal paths?
Yes, the QS3VH125QG8 supports fully bidirectional analog signal flow with near-zero propagation delay and no ground bounce - verified by its "bidirectional dataflow with near-zero delay" feature and rail-to-rail 0–5V capability. Its 4pF typical OFF-state I/O capacitance and 4Ω RON preserve signal fidelity in audio, sensor, and video multiplexing applications. Unlike unidirectional translators, it requires no direction-control signals and functions identically regardless of signal source/sink orientation.
What package type is used for the QS3VH125QG8?
The QS3VH125QG8 is supplied in a 16-pin QSOP (Quarter-Size Outline Package) with green RoHS-compliant finish, as indicated by the "QG" suffix in the part number. This surface-mount package measures 3.9mm × 9.9mm with 0.635mm lead pitch and is compatible with standard reflow soldering profiles. The pinout matches industry-standard QSOP footprints, simplifying layout reuse across Renesas' QuickSwitch® portfolio.
QS3VH125QG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 3VH
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 4:1
- 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-QSOP
QS3VH125QG8 FAQ
1.How can I place an order for QS3VH125QG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3VH125QG8 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 QS3VH125QG8 reliable?
The price and inventory of QS3VH125QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3VH125QG8 is usually 5 days.
3.What payment methods are accepted for QS3VH125QG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3VH125QG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3VH125QG8?
QS3VH125QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3VH125QG8 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 QS3VH125QG8?
For technical support, including QS3VH125QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3VH125QG8 requirements.
6.How does Aetrix verify that QS3VH125QG8 is sourced from the original manufacturer or authorized distributors?
All QS3VH125QG8 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 QS3VH125QG8 meets industry standards.
7.What is the process for return or replacement of QS3VH125QG8?
All QS3VH125QG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3VH125QG8, 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 QS3VH125QG8 part is unused and in its original packaging.
Return procedure for QS3VH125QG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
QS3VH125QG8 Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
