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Renesas QS32245QG
- Part No.:
- QS32245QG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
QS32245QG.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:517
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Product details
Overview
QS32245QG from Renesas Electronics is an 8-bit high-speed CMOS bus switch with TTL-compatible control inputs, 25Ω series resistors for ground bounce suppression, zero propagation delay, and operation across –40°C to +85°C. It serves as a bidirectional data path isolator in hot-swap interfaces and voltage translation between 5V and 3.3V domains.
For engineers reviewing the QS32245QG datasheet, QS32245QG pinout, QS32245QG application, or QS32245QG equivalent, key selection criteria include ON-resistance (18–35 Ω), switching speed (tPLH/tPHL ≤ 1.25 ns), OE-controlled bidirectional isolation, and QSOP-20 package compatibility with legacy 74F/74FCT245 layouts.
Technical Context
The QS32245QG implements eight independent N-channel FET switches with no inherent body diode to VCC, enabling true bidirectional signal flow without forward-bias constraints. Each channel features 25Ω integrated series resistance to dampen ground bounce during fast edge transitions.
Its OE input directly controls all eight switches synchronously-LOW enables conduction (An ↔ Bn), HIGH places outputs in high-impedance state. Control inputs are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and undershoot clamp diodes protect all I/O and control pins against negative transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Type | 8-bit bidirectional CMOS bus switch with zero propagation delay |
| ON Resistance | 18–35 Ω at VCC = 5 V; ensures minimal voltage drop and signal integrity under 30 mA load |
| Propagation Delay | ≤ 1.25 ns max (tPLH/tPHL); system-level delay dominated by external RC, not device |
| Operating Temp | –40°C to +85°C industrial grade; validated for embedded control and industrial interface use |
| Supply Voltage | 5.0 V ±5%; supports standard TTL/CMOS logic rails with ±0.5 V absolute max tolerance |
| Input Compatibility | TTL-compatible OE input (VIH ≥ 2.0 V, VIL ≤ 0.8 V); interoperable with legacy 74-series drivers |
| Package | 20-pin QSOP (PCG20); pinout compatible with 74FCT245, 74F245, and 74ALS/AS/LS245 |
Pinout & Package
QS32245QG is housed in a 20-pin Quarter Size Outline Package (QSOP, PCG20), 0.65 mm pitch, 7.2 mm × 5.3 mm body size, with exposed pad not present. Pin 1 is top-left corner (notch-marked side).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No Connect | Internally unconnected; must be left floating or tied to GND per layout best practice |
| 2 A0 | Data I/O (Port A) | Bidirectional terminal paired with B0; connects to local bus or controller side |
| 3 GND | Ground Reference | Primary return path for switch current and control logic; requires low-inductance connection |
| 4 VCC | Power Supply | 5 V supply input; bypass capacitor (0.1 µF) required adjacent to pin |
| 5 OE | Output Enable | Active-LOW global enable; drives all 8 switches simultaneously into Hi-Z when HIGH |
| 6–13 A1–A7 | Data I/Os (Port A) | Remaining 7 bidirectional Port A terminals; match B1–B7 in sequence |
| 14–20 B0–B7 | Data I/Os (Port B) | Corresponding Port B terminals; isolated from Port A when OE = HIGH |
Key Features
| Feature | Design Value |
|---|---|
| Zero propagation delay architecture | Eliminates added timing skew in high-speed data paths; delay determined solely by external R/C loading |
| 25Ω integrated series resistance | Reduces ground bounce noise during simultaneous switching of multiple bits without external resistors |
| Undershoot clamp diodes on all pins | Protects against –3 V transient excursions on control and data lines, enhancing system robustness |
| Enhanced N-channel FET with no VCC diode | Enables true bidirectional DC-coupled signal flow without blocking reverse current or forward bias issues |
| Pin compatibility with 74F/74FCT245 | Allows drop-in replacement in existing designs using industry-standard transceiver footprints |
Applications
| Hot-Swapping Interfaces | Voltage Translation (5V ↔ 3.3V) |
|---|---|
Use Scenario: Insertion/removal of peripheral cards while main system remains powered. IC Role / Device Role / Timing Role: Bidirectional bus isolator that blocks backfeed and prevents supply contention during plug events. Use Value: Enables safe live insertion via OE-controlled isolation, eliminating need for complex power sequencing circuitry. | Use Scenario: Interfacing 5V microcontrollers with 3.3V FPGAs or memory devices. IC Role / Device Role / Timing Role: Level-shifting bus switch with no direction pin or voltage regulator required. Use Value: Supports DC-coupled translation with <1.25 ns delay and 18–35 Ω RON, preserving signal rise/fall times. |
| Capacitance Reduction & Isolation | Logic Replacement in Data Processing |
Use Scenario: Reducing effective bus capacitance in multi-drop systems to meet timing closure. IC Role / Device Role / Timing Role: High-impedance break point inserted between bus segments to lower total CLOAD. Use Value: Cuts dynamic loading by isolating unused sections; typical off-state capacitance is only 5–7 pF per channel. | Use Scenario: Replacing 74FCT245 transceivers in legacy data-path designs where speed and power matter. IC Role / Device Role / Timing Role: Drop-in functional replacement offering faster switching and lower ICCQ (3 µA). Use Value: Delivers same pinout and logic behavior but with zero propagation delay and 25Ω noise damping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3245APW | Higher typical RON (5–7 Ω vs. 18–35 Ω); no integrated 25Ω series resistors; different OE polarity (active-HIGH) | Optimized for ultra-low-loss signal routing, not ground bounce suppression | Prefer QS32245QG when noise control and industrial temp range are critical |
| 74FCT245CTSO20 | True transceiver (direction-controlled); higher ICCQ (20 µA); no undershoot clamps; no 25Ω resistors | Requires direction pin and separate control logic; unsuitable for hot-swap isolation | QS32245QG offers simpler OE-only control and superior ESD/noise robustness |
Compared with SN74CBT3245APW and 74FCT245CTSO20, the QS32245QG uniquely combines OE-only control, integrated noise-damping resistors, undershoot protection, and industrial temperature validation-making it optimal for ruggedized hot-swap and mixed-voltage isolation where reliability trumps minimal RON.
Availability
QS32245QG is available at Aetrix Electronics and suitable for hot-swapping interfaces, voltage translation (5V ↔ 3.3V), and bus isolation applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for QS32245QG 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 markets.
The QS32245QG belongs to Renesas' QuickSwitch® family-designed specifically for high-speed, low-noise, bidirectional bus isolation in industrial and embedded systems demanding hot-swap capability and mixed-voltage interoperability.
FAQ
What is the operating voltage range for QS32245QG?
The QS32245QG operates at VCC = 5.0 V ±5%, with absolute maximum ratings from –0.5 V to +7.0 V on all terminals except VCC. It is specified for industrial temperature range (–40°C to +85°C) and supports TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). The QS32245QG does not support 3.3 V-only operation.
Does QS32245QG support true bidirectional signal flow?
Yes, the QS32245QG uses enhanced N-channel FETs with no inherent diode to VCC, enabling symmetrical, DC-coupled bidirectional conduction between An and Bn ports. Unlike transceivers, it requires no direction control pin-only OE governs conduction state. This makes QS32245QG ideal for passive bus isolation and voltage translation where signal polarity must remain unchanged.
What is the purpose of the 25Ω series resistors in QS32245QG?
The 25Ω series resistors integrated into each QS32245QG switch path suppress ground bounce noise caused by simultaneous switching of multiple bits. They dampen fast edge-induced current spikes without requiring external components, improving signal integrity in dense PCB layouts. This feature is absent in standard transceivers like 74FCT245 and distinguishes QS32245QG for industrial hot-swap use.
Is QS32245QG pin-compatible with 74FCT245 devices?
Yes, the QS32245QG has identical pinout and function mapping to 74FCT245, 74F245, and 74ALS/AS/LS245 transceivers-including OE-active-LOW control and An/Bn I/O pairing. Its QSOP-20 (PCG20) package matches the footprint of those legacy parts, enabling direct PCB replacement without layout changes-provided OE logic and voltage levels align.
What is the maximum capacitive load the QS32245QG can drive reliably?
The QS32245QG is characterized with CLOAD = 50 pF and RLOAD = 500 Ω in switching tests, yielding tPLH/tPHL ≤ 1.25 ns. Its low RON (18–35 Ω) and zero intrinsic propagation delay mean total system delay scales linearly with load capacitance. For reliable operation, keep total node capacitance ≤ 100 pF to maintain sub-2.5 ns edge fidelity-verified in industrial-grade timing analysis for QS32245QG.
QS32245QG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 8:1
- 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:
- 20-QSOP
QS32245QG FAQ
1.How can I place an order for QS32245QG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS32245QG 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 QS32245QG reliable?
The price and inventory of QS32245QG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS32245QG is usually 5 days.
3.What payment methods are accepted for QS32245QG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS32245QG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS32245QG?
QS32245QG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS32245QG 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 QS32245QG?
For technical support, including QS32245QG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS32245QG requirements.
6.How does Aetrix verify that QS32245QG is sourced from the original manufacturer or authorized distributors?
All QS32245QG 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 QS32245QG meets industry standards.
7.What is the process for return or replacement of QS32245QG?
All QS32245QG units undergo pre-shipment inspection (PSI). If there is an issue with QS32245QG, 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 QS32245QG part is unused and in its original packaging.
Return procedure for QS32245QG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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