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Renesas QS3245SOG8
- Part No.:
- QS3245SOG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
QS3245SOG8.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,265
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Product details
Overview
QS3245SOG8 from Renesas Electronics is an 8-bit high-speed CMOS bus switch with TTL-compatible control inputs, 5Ω typical ON resistance, zero propagation delay, and industrial temperature range (–40°C to +85°C). It functions as a bidirectional data path isolator in hot-swap interfaces and voltage translation between 5V and 3.3V domains.
For engineers reviewing the QS3245SOG8 datasheet, QS3245SOG8 pinout, QS3245SOG8 application, or QS3245SOG8 equivalent, key selection criteria include its undervoltage clamp diodes, OE-controlled switching, SOIC-20 green package, and compatibility with 74FCT245/74F245 logic families.
Technical Context
The QS3245SOG8 implements eight independent N-channel FET switches with no inherent body diode to VCC, enabling true bidirectional signal flow without forward-bias risk. Its OE input directly controls all eight channels synchronously, mirroring the 74'245 transceiver enable behavior.
Switching is characterized by tPZL ≤ 5.6 ns (OE-to-output turn-on) and tPLZ ≤ 4.5 ns (OE-to-output turn-off), with pass voltage VP ≥ 3.7 V at VCC = 5 V and IOUT = –5 μA - confirming robust signal integrity under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance (RON) | 5 Ω typical at VIN = 0 V - enables low-loss signal coupling with minimal RC delay |
| Propagation Delay | 0.25 ns max - contributes negligible timing overhead in high-speed data paths |
| Supply Voltage Range | –0.5 V to +7 V - supports operation across 3.3 V, 5 V, and mixed-voltage systems |
| Input Voltage Range (VIN) | –0.5 V to +7 V - accommodates undershoot/overshoot without latch-up |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and infrastructure applications |
| Quiescent Current (ICCQ) | 3 μA max - enables ultra-low-power standby in battery-backed or energy-sensitive designs |
| Output Enable Propagation | tPZL/tPLZ ≤ 5.6/4.5 ns - ensures fast, deterministic bus isolation during hot-plug events |
Pinout & Package
QS3245SOG8 is housed in a 20-pin Small Outline IC (SOIC) green package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded; must be left floating or tied to GND per layout guidelines |
| 2–9, 11–18 (A0–A7, B0–B7) | Bidirectional Data I/O | Eight independent switch channels; each pair connects Ax ↔ Bx when OE active |
| 10 (GND) | Ground Reference | Primary return path for switch current and control logic |
| 19 (VCC) | Power Supply | 5 V nominal supply; powers internal logic and switch bias circuitry |
| 20 (OE) | Output Enable Input | Active-low TTL-compatible control; disables all switches when HIGH |
Key Features
| Feature | Design Value |
|---|---|
| Zero-propagation-delay switching | RC-limited delay < 0.25 ns with 50 pF load - preserves signal edge fidelity in >100 MHz buses |
| Undershoot clamp diodes | Integrated on all A/B/OE pins - prevents negative transients from violating absolute max ratings |
| TTL-compatible control inputs | VIL ≤ 0.8 V, VIH ≥ 2 V - allows direct interfacing with legacy 5 V logic without level shifters |
| Pin compatibility | Direct replacement for 74F245, 74FCT245, and 74FCT245T - enables drop-in upgrade in existing PCBs |
| Low ON-resistance FETs | 5 Ω typical RON - minimizes voltage drop and signal attenuation across switched paths |
Applications
| Hot-Swappable Backplane Interface | Voltage Translation (5V ↔ 3.3V) |
|---|---|
Use Scenario: Insertion/removal of line cards in telecom or server backplanes while system remains powered. IC Role / Device Role / Timing Role: Bidirectional bus isolator that blocks fault currents and prevents ground bounce during plug events. Use Value: Enables safe hot-docking via OE-controlled channel disable, leveraging undervoltage clamps to absorb insertion transients. | Use Scenario: Interfacing legacy 5 V microcontrollers with modern 3.3 V peripherals (e.g., sensors, memory). IC Role / Device Role / Timing Role: Passive voltage-level translator with no direction control or power supply requirements beyond VCC. Use Value: Eliminates need for active translators or resistor dividers; maintains signal integrity with 5 Ω RON and sub-ns delay. |
| Logic Replacement in Data Processing | Capacitance Reduction & Bus Isolation |
Use Scenario: Replacing 74FCT245 transceivers in FPGA I/O expansion or ASIC glue logic where direction control adds complexity. IC Role / Device Role / Timing Role: Unidirectional or bidirectional data path with simplified OE-only control instead of DIR + OE. Use Value: Reduces control pin count and eliminates direction-control timing constraints while maintaining full data throughput. | Use Scenario: Isolating noisy digital subsystems (e.g., motor drivers) from sensitive analog or communication circuits. IC Role / Device Role / Timing Role: Low-capacitance (≤7 pF off-state) switch that decouples parasitic loading between domains. Use Value: Cuts inter-subsystem crosstalk by >20 dB and reduces total bus capacitance by up to 40% versus standard buffers. |
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 |
|---|---|---|---|
| 74FCT245ATSO | Higher propagation delay (~5 ns), higher ICCQ (~10 μA), requires direction control (DIR pin) | Requires additional control logic and timing margin; not suitable for zero-delay critical paths | Choose when legacy design already uses DIR-based control and delay budget permits |
| SN74CBT3245APW | Similar RON (6 Ω), but lacks undershoot clamps and has narrower VIN range (–0.5 V to VCC + 0.5 V) | Not recommended for hot-swap or mixed-voltage environments with transient risk | Prefer for cost-sensitive, non-hot-swap 3.3 V–only systems with clean signal integrity |
Compared with 74FCT245ATSO and SN74CBT3245APW, the QS3245SOG8 uniquely combines zero-delay switching, integrated undershoot protection, and true 5V/3.3V interoperability - making it optimal for industrial hot-swap and mixed-voltage isolation where reliability and timing predictability are critical.
Availability
QS3245SOG8 is available at Aetrix Electronics and suitable for hot-swap backplane interfaces, voltage translation between 5V and 3.3V domains, and bus isolation in industrial control systems requiring stable component supply and long-term lifecycle support.
Supply support for QS3245SOG8 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 SoC solutions for automotive, industrial, and IoT applications.
The QS3245SOG8 belongs to Renesas' QuickSwitch® family of high-speed bus switches, designed specifically for zero-delay signal routing, hot-plug resilience, and mixed-voltage domain bridging in mission-critical infrastructure.
FAQ
What is the maximum operating voltage for QS3245SOG8?
The QS3245SOG8 supports a supply voltage (VCC) range of –0.5 V to +7 V, with DC input voltage (VIN) and DC switch voltage (VS) rated identically. This allows safe operation in 3.3 V, 5 V, and mixed-rail systems, including transient conditions up to ±7 V. The device is specified for reliable function at VCC = 5.0 V ±5% across the industrial temperature range.
Does QS3245SOG8 require external pull-up or pull-down resistors on its control inputs?
No, QS3245SOG8 does not require external pull-up or pull-down resistors on the OE pin. Its TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) and low input leakage (±1 μA) ensure robust logic-level recognition from standard 5 V drivers. External resistors may be used only for fail-safe default states in safety-critical designs, but are not electrically necessary for normal operation of QS3245SOG8.
Can QS3245SOG8 be used for bidirectional level shifting between 5V and 3.3V logic?
Yes, QS3245SOG8 supports true bidirectional voltage translation between 5 V and 3.3 V domains without direction control. When VCC = 5 V, its 5 Ω RON and pass voltage VP ≥ 3.7 V allow 3.3 V signals to drive 5 V loads with minimal degradation, and 5 V signals to safely interface with 3.3 V receivers via clamping. This capability is validated in the QS3245SOG8 datasheet for voltage translation applications.
Is QS3245SOG8 pin-compatible with the 74F245 transceiver?
Yes, QS3245SOG8 is explicitly pin-compatible with the 74F245, 74FCT245, and 74FCT245T transceivers in SOIC-20 packages. Pin mapping matches exactly: A0–A7 and B0–B7 occupy identical positions, OE replaces the DIR+OE dual-control scheme with single-enable simplicity, and VCC/GND locations align. This enables drop-in replacement without PCB modification for QS3245SOG8.
What thermal derating applies to QS3245SOG8 at elevated ambient temperatures?
QS3245SOG8 has a maximum power dissipation of 0.5 W at TA = 85°C. Its thermal resistance (θJA) is approximately 120°C/W in standard SOIC-20 mounting. At 85°C ambient, junction temperature remains within safe limits (<125°C) under typical switching conditions. Derating is linear: power limit decreases by ~4.2 mW/°C above 85°C. Full thermal data for QS3245SOG8 is provided in the Renesas datasheet DSC-5753/6.
QS3245SOG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 8 x 1:1
- 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-SOIC
QS3245SOG8 FAQ
1.How can I place an order for QS3245SOG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3245SOG8 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 QS3245SOG8 reliable?
The price and inventory of QS3245SOG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3245SOG8 is usually 5 days.
3.What payment methods are accepted for QS3245SOG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3245SOG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3245SOG8?
QS3245SOG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3245SOG8 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 QS3245SOG8?
For technical support, including QS3245SOG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3245SOG8 requirements.
6.How does Aetrix verify that QS3245SOG8 is sourced from the original manufacturer or authorized distributors?
All QS3245SOG8 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 QS3245SOG8 meets industry standards.
7.What is the process for return or replacement of QS3245SOG8?
All QS3245SOG8 units undergo pre-shipment inspection (PSI). If there is an issue with QS3245SOG8, 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 QS3245SOG8 part is unused and in its original packaging.
Return procedure for QS3245SOG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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