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Renesas QS3253QG
- Part No.:
- QS3253QG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS3253QG.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,638
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Product details
Overview
QS3253QG from Renesas Electronics is a high-speed CMOS dual 4:1 multiplexer/demultiplexer with TTL-compatible control inputs, 5 Ω bidirectional switch ON resistance, zero propagation delay, and industrial temperature range (–40°C to +85°C). It serves as a logic-level bus switch in signal routing applications requiring voltage translation between 5V and 3.3V domains.
For engineers reviewing the QS3253QG datasheet, QS3253QG pinout, QS3253QG application, or QS3253QG equivalent, key selection criteria include bidirectional low-RON switching, undershoot clamp diodes on all I/Os, 3-state outputs, and compatibility with legacy 74F/74FCT253 logic families.
Technical Context
The QS3253QG implements two independent 4:1 mux/demux channels using enhanced N-channel FET switches with no inherent body diode to VCC, enabling true bidirectional signal flow without DC path constraints. Each channel features separate enable (EA/EB) and dual-bit select (S1/S0) controls, supporting simultaneous or independent routing of analog or digital signals.
Its architecture eliminates ground bounce and propagation delay by decoupling switching from logic gate delays-signal path delay is dominated solely by RON·CLOAD time constant (~0.25 ns for 50 pF), not internal logic. Undershoot clamp diodes on all switch and control pins allow safe hot-swapping in live backplane or docking environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 5.0 V ±5% - supports standard 5V TTL/CMOS systems with margin for supply variation |
| RON (Typ) | 5 Ω at VIN = 0 V - enables minimal insertion loss and preserves signal integrity for analog/video paths |
| tPLH/tPHL (Max) | 0.25 ns - contributes negligible propagation delay beyond RC load effects |
| Input Voltage Range | –0.5 V to +7 V - accommodates transient undershoot and mixed-voltage interface scenarios |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
| IOUT (DC) | ±120 mA - supports driving moderate capacitive loads or fan-out to multiple CMOS inputs |
| Capacitance (I/O) | 5–16 pF - low input/output capacitance minimizes loading on source and destination buses |
Pinout & Package
QS3253QG is packaged in a 16-pin QSOP (Quarter Size Outline Package), RoHS-compliant and green-processed (QG suffix). Pin pitch is 0.65 mm, body width 3.9 mm, height 1.35 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EA, EB | Active-Low Enable Inputs | Assert low to activate respective 4:1 channel; high-Z output when disabled |
| S0, S1 | Binary Select Inputs | Control which of four inputs (I0x–I3x) connects to output (Yx); TTL-compatible thresholds |
| I0A–I3A, I0B–I3B | Data Inputs | Bidirectional terminals - function as inputs during mux mode, outputs during demux mode |
| YA, YB | Data Outputs | 3-state outputs with high-impedance disable; support bus funneling and shared-line arbitration |
| VCC | Power Supply | 5V supply rail; powers internal logic and switch bias circuitry |
| GND | Ground Reference | Common return for logic and analog signal paths; critical for noise immunity in mixed-signal routing |
Key Features
| Feature | Design Value |
|---|---|
| Zero propagation delay | Signal path delay limited only by RON·CL; no added logic-stage latency |
| 5 Ω bidirectional switch | Enables low-loss analog signal routing (e.g., video/audio) and bidirectional data bus sharing |
| Undershoot clamp diodes | Protects all switch and control pins against –3 V transients, enabling hot-swap capability |
| TTL-compatible control inputs | VIH ≥ 2 V, VIL ≤ 0.8 V - interfaces directly with legacy 5V logic without level shifters |
| Pin compatibility | Direct replacement for 74F253, 74FCT253, and 74ALS/AS/LS253 in existing PCB layouts |
Applications
| Video Signal Routing | Hot-Swappable Docking Station |
|---|---|
Use Scenario: Switching composite or RGB video signals between multiple sources and displays in AV receivers or KVM extenders. IC Role / Device Role / Timing Role: Bidirectional analog mux/demux with low RON and wide voltage swing handling. Use Value: Preserves signal fidelity with <5 Ω channel resistance and <16 pF I/O capacitance, avoiding ghosting or bandwidth loss. | Use Scenario: Enabling safe insertion/removal of laptop or peripheral modules into industrial docking stations with live 5V buses. IC Role / Device Role / Timing Role: Hot-swap isolation switch with undershoot clamping and zero-delay pass-through. Use Value: Clamp diodes tolerate –3 V transients; no ground bounce ensures stable system reset behavior during plug events. |
| 5V-to-3.3V Voltage Translation | Embedded Bus Funneling |
Use Scenario: Interfacing legacy 5V microcontrollers with newer 3.3V peripherals (e.g., sensors, ADCs) without external level shifters. IC Role / Device Role / Timing Role: Passive voltage-tolerant bidirectional switch operating across mixed-supply domains. Use Value: Supports DC-coupled translation up to 5V input while driving 3.3V logic thresholds, eliminating timing skew from active translators. | Use Scenario: Consolidating multiple sensor or I/O lines onto a single microcontroller bus in space-constrained industrial controllers. IC Role / Device Role / Timing Role: Dual-channel 4:1 funneling switch with independent enables and selects. Use Value: Reduces MCU pin count requirement by 6:1 per channel while maintaining full signal integrity via low-RON paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4:1 analog/digital switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT253SO | Higher RON (~15 Ω), no undershoot clamps, no 3-state outputs | Limited to digital-only use; unsuitable for hot-swap or analog signal routing | Choose only if legacy board compatibility is mandatory and analog performance is irrelevant |
| SN74CBT3253PWR | Similar RON (6 Ω), same pinout, but lacks undershoot clamps and has narrower VIN range (–0.5V to VCC+0.5V) | Not rated for hot-swap; requires external protection diodes in live-insertion designs | Select when cost sensitivity outweighs robustness requirements and clamping is handled externally |
Compared with 74FCT253SO and SN74CBT3253PWR, the QS3253QG uniquely combines sub-5Ω RON, integrated undershoot clamps, and true 3-state operation-making it the only option among the three qualified for mixed-signal hot-swap and voltage-translation applications without add-on components.
Availability
QS3253QG is available at Aetrix Electronics and suitable for video signal routing, hot-swappable docking stations, 5V-to-3.3V voltage translation, and embedded bus funneling requiring stable component supply across industrial design cycles.
Supply support for QS3253QG 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 QS3253QG belongs to Renesas' QuickSwitch® family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in mixed-voltage and hot-plug-capable systems.
FAQ
What is the maximum signal voltage that can be safely routed through the QS3253QG?
The QS3253QG supports DC switch voltages from –0.5 V to +7 V on all I/O terminals except VCC. This allows safe routing of signals exceeding VCC (e.g., 5V signals in a 3.3V system) and tolerates –3 V undershoot transients due to integrated clamp diodes-critical for hot-swap reliability. The QS3253QG's absolute maximum rating ensures robust operation under real-world interface stress conditions.
Does the QS3253QG require external pull-up or pull-down resistors on its control inputs?
No, the QS3253QG does not require external biasing on EA, EB, S0, or S1. Its TTL-compatible inputs have guaranteed VIH ≥ 2 V and VIL ≤ 0.8 V, and input leakage current is limited to ±1 μA over temperature. This allows direct connection to standard CMOS or TTL outputs without additional components-simplifying layout and reducing BOM count for the QS3253QG.
Can the QS3253QG be used for analog signal switching, such as audio or video?
Yes, the QS3253QG is explicitly suited for analog signal routing. With 5 Ω typical RON, <16 pF I/O capacitance, and flat frequency response up to hundreds of MHz, it preserves signal integrity for composite video, stereo audio, and other baseband analog paths. Its bidirectional nature and absence of body diodes prevent DC path distortion-key advantages confirmed in the QS3253QG functional description and electrical characterization.
Is the QS3253QG pin-compatible with the industry-standard 74F253 logic device?
Yes, the QS3253QG is explicitly specified as pin-compatible with the 74F253, 74FCT253, and 74ALS/AS/LS253 dual 4:1 multiplexers. Its 16-pin QSOP footprint matches the SOIC package outline of those devices, and all signal names (EA, EB, S0, S1, I0A–I3B, YA, YB) align functionally and physically-enabling drop-in replacement without PCB modification for the QS3253QG.
What thermal derating applies to the QS3253QG at its maximum operating temperature?
The QS3253QG is characterized for continuous operation from –40°C to +85°C with no thermal derating required. Its maximum power dissipation is specified as 0.5 W at TA = +85°C, and quiescent supply current remains below 3 μA. Thermal performance is validated across the full industrial range, ensuring stable RON, timing, and leakage behavior without design margin penalties for the QS3253QG.
QS3253QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- 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
QS3253QG FAQ
1.How can I place an order for QS3253QG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3253QG 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 QS3253QG reliable?
The price and inventory of QS3253QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3253QG is usually 5 days.
3.What payment methods are accepted for QS3253QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3253QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3253QG?
QS3253QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3253QG 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 QS3253QG?
For technical support, including QS3253QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3253QG requirements.
6.How does Aetrix verify that QS3253QG is sourced from the original manufacturer or authorized distributors?
All QS3253QG 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 QS3253QG meets industry standards.
7.What is the process for return or replacement of QS3253QG?
All QS3253QG units undergo pre-shipment inspection (PSI). If there is an issue with QS3253QG, 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 QS3253QG part is unused and in its original packaging.
Return procedure for QS3253QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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