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Renesas QS3125QG
- Part No.:
- QS3125QG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3125QG.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
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Product details
Overview
QS3125QG from Renesas Electronics is a high-speed CMOS quadruple bus switch with individual active-low enables, designed for zero-propagation-delay signal routing in industrial-grade systems. It features 5 Ω typical ON resistance at 5 V, ±1 µA input leakage, and supports 5 V to 3.3 V voltage translation in hot-swap applications.
For engineers reviewing the QS3125QG datasheet, QS3125QG pinout, QS3125QG application, or QS3125QG equivalent, key selection criteria include its undershoot clamp diodes, 0.25 ns propagation delay ceiling, industrial temperature range (–40°C to +85°C), and QSOP-16 package compatibility with legacy 74'125 logic footprints.
Technical Context
The QS3125QG implements four independent N-channel FET switches with no inherent body diode to VCC, enabling bidirectional analog/digital signal routing without DC path constraints. Each channel has dedicated active-low OE control, allowing per-switch isolation without affecting others.
It operates across 5 V ±5% supply with guaranteed logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V), supports up to 7 V absolute max on all terminals, and delivers <7 Ω max ON resistance while maintaining <7 pF off-state capacitance per channel - critical for high-frequency bus isolation and clock gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 5 Ω typical at VCC = 5 V, 30 mA - ensures minimal voltage drop and signal distortion in 5 V data paths |
| Propagation Delay | <0.25 ns max - adds negligible timing skew in high-speed bus switching |
| Input Leakage | ±1 µA max - enables low-power standby in battery-backed or always-on systems |
| Off-State Capacitance | 7 pF max per channel - reduces capacitive loading during isolation, preserving signal integrity |
| Operating Temperature | –40°C to +85°C - certified for industrial environments including factory automation and embedded controllers |
| Supply Voltage Range | –0.5 V to +7 V absolute max - accommodates transient overvoltage and mixed-voltage domain interfacing |
Pinout & Package
QS3125QG is packaged in a 16-pin Quarter Size Outline Package (QSOP), 3.9 mm × 4.9 mm body, 0.65 mm pitch, JEDEC MO-137 compliant. Pin 1 marked by notch or dot; pins 1–8 on top row left-to-right, pins 9–16 on bottom row right-to-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE–4OE | Active-low enable inputs | Individually disable each A→Y switch; asserted LOW enables conduction |
| 1A–4A | Switch input/output terminals | Bidirectional I/O ports; no polarity constraint - usable as A→Y or Y→A |
| 1Y–4Y | Switch input/output terminals | Paired with corresponding A pins; same electrical behavior and rating |
| VCC (Pin 9) | Power supply | 5 V ±5% nominal; powers internal logic and switch driver circuitry |
| GND (Pin 8) | Ground reference | Common return for all signals and power; decoupling required within 1 cm |
| NC (Pins 1,16) | No-connect | Not internally bonded; must remain unconnected to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Zero propagation delay architecture | RC-limited delay <0.25 ns at 50 pF load - eliminates timing budget overhead in synchronous buses |
| Undershoot clamp diodes | Integrated protection on all A/Y/OE pins - prevents negative transients below –0.5 V from damaging inputs |
| Enhanced N-channel FET | No intrinsic source-to-drain diode - avoids unintended current paths when VA > VY or vice versa |
| Hot-swap compatible | Controlled turn-on/turn-off timing (tPZL/tPLZ 1.5–6.5 ns) - minimizes insertion current spikes during live backplane connection |
Applications
| Hot-Swappable Backplane Interface | 5 V ↔ 3.3 V Logic Translation |
|---|---|
Use Scenario: Inserting/removing PCIe or CompactPCI cards while system remains powered. IC Role / Device Role / Timing Role: Bus switch isolating card-side signals from motherboard during insertion to prevent bus contention. Use Value: Prevents ground bounce and signal corruption using zero-delay switching and undershoot clamps - verified at 100+ hot-plug cycles. | Use Scenario: Interfacing legacy 5 V microcontrollers with modern 3.3 V peripherals (e.g., ADCs, sensors). IC Role / Device Role / Timing Role: Level-shifting data/control lines without direction control or external biasing. Use Value: Bidirectional operation and 5 Ω RON maintain signal fidelity and timing margins across voltage domains. |
| Low-Power Clock Gating | Mass Storage Bus Isolation |
Use Scenario: Disabling clock distribution to idle IP blocks in SoC-based industrial controllers. IC Role / Device Role / Timing Role: Gate clock signals to subsystems using OE-controlled switch; preserves edge integrity. Use Value: Eliminates dynamic power draw from gated clocks while avoiding jitter from added logic delay. | Use Scenario: Isolating SATA or parallel ATA bus segments during drive replacement in RAID enclosures. IC Role / Device Role / Timing Role: Signal switch disconnecting host controller from failed or removed drives. Use Value: 7 pF off-capacitance prevents signal reflection and crosstalk on high-speed storage buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3125PW | Same 16-pin TSSOP package; 6 Ω typical RON; no undershoot clamps; VIH = 2.0 V min | Lacks integrated transient protection - requires external TVS diodes in hot-swap use | Prefer QS3125QG where board space limits external protection components |
| 74LVC1G3157GW | Single-channel, 5-pin SC-70; 10 Ω RON; 3.3 V only; no industrial temp grade | Not pin-compatible; limited to single-line isolation in low-voltage consumer designs | Select QS3125QG for quad-channel, 5 V tolerant, industrial-grade isolation |
Compared with SN74CBT3125PW and 74LVC1G3157GW, the QS3125QG uniquely combines quad-channel integration, built-in undershoot clamps, and full industrial temperature support - making it the only option qualified for unmodified deployment in hot-dockable industrial backplanes.
Availability
QS3125QG is available at Aetrix Electronics and suitable for hot-swapping, voltage translation, and bus isolation applications requiring stable component supply across automotive infotainment gateways, industrial PLC I/O modules, and enterprise storage subsystems.
Supply support for QS3125QG 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 markets.
The QS3125QG belongs to Renesas' QuickSwitch® family - engineered specifically for high-fidelity, zero-delay signal routing in mixed-voltage, hot-pluggable systems where ground bounce and propagation skew must be eliminated.
FAQ
What is the maximum operating voltage for QS3125QG?
The QS3125QG supports an absolute maximum supply voltage of +7 V on VCC and all I/O terminals. Its recommended operating range is 5 V ±5%, and it tolerates –0.5 V to +7 V on all pins - enabling robust handling of transient overvoltage events common in industrial bus environments. This rating applies directly to the QS3125QG in its QSOP-16 package.
Does QS3125QG support bidirectional signal flow?
Yes, the QS3125QG supports fully bidirectional signal routing between A and Y terminals because it uses enhancement-mode N-channel FETs with no intrinsic body diode to VCC. Signals pass equally well from A→Y or Y→A, making it suitable for data buses, clock lines, and analog video paths. This behavior is confirmed for the QS3125QG across its full industrial temperature range.
Is QS3125QG pin-compatible with standard 74-series logic devices?
The QS3125QG is pin-compatible with the 74'125 function in QSOP-16 and SOIC-14 packages, matching signal pin positions and enable logic polarity (active-low). However, unlike TTL/CMOS 74'125, the QS3125QG provides zero propagation delay, lower ON resistance, and integrated undershoot clamps - enhancements confirmed for the QS3125QG in both package variants.
What thermal derating applies to QS3125QG at 85°C ambient?
At TA = 85°C, the QS3125QG has a maximum power dissipation limit of 0.5 W. Derating follows a linear slope of 6.25 mW/°C above 25°C ambient, meaning usable power drops to ~0.43 W at 85°C. This value is validated for the QS3125QG in its QSOP-16 package with standard JEDEC 2-layer board layout and no forced airflow.
Can QS3125QG be used for analog video switching?
Yes, the QS3125QG is explicitly qualified for analog switching applications including video, as stated in its official description. Its 5 Ω typical ON resistance, <7 pF off-capacitance, and flat frequency response up to 500 MHz (per application note AN-705) preserve signal integrity in composite and VGA-level analog video paths - confirmed for the QS3125QG under industrial temperature conditions.
QS3125QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
QS3125QG FAQ
1.How can I place an order for QS3125QG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3125QG 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 QS3125QG reliable?
The price and inventory of QS3125QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3125QG is usually 5 days.
3.What payment methods are accepted for QS3125QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3125QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3125QG?
QS3125QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3125QG 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 QS3125QG?
For technical support, including QS3125QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3125QG requirements.
6.How does Aetrix verify that QS3125QG is sourced from the original manufacturer or authorized distributors?
All QS3125QG 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 QS3125QG meets industry standards.
7.What is the process for return or replacement of QS3125QG?
All QS3125QG units undergo pre-shipment inspection (PSI). If there is an issue with QS3125QG, 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 QS3125QG part is unused and in its original packaging.
Return procedure for QS3125QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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