My Inquiry
My Account
Renesas QS3244PAG
- Part No.:
- QS3244PAG
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
QS3244PAG.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
QS3244PAG from Renesas Electronics is an 8-bit high-speed CMOS bus switch with 5Ω bidirectional ON resistance, TTL-compatible pinout matching 74FCT244/74F244, and industrial temperature range (–40°C to +85°C). It enables zero-propagation-delay data routing, hot-swap isolation, and 5V-to-3.3V voltage translation in backplane and modular system interfaces.
For engineers reviewing the QS3244PAG datasheet, QS3244PAG pinout, QS3244PAG application, or QS3244PAG equivalent, key selection criteria include guaranteed 5Ω RON at VCC = 5V, undershoot clamp diodes on all I/Os, dual independent enable control (1G/2G), and compatibility with QSOP-20 package for space-constrained board layouts.
Technical Context
The QS3244PAG implements eight independent bidirectional analog switches using enhanced N-channel FETs with no inherent body diode to VCC, eliminating latch-up risk during voltage translation. Each channel features undriven Hi-Z off-state and rail-to-rail signal pass capability up to 7V.
Control logic uses two active-low enable inputs (1G, 2G) to independently activate Group 1 (1A1–1Y4) or Group 2 (2A1–2Y4) channels. Switching is transparent-no level-shifting or timing logic is embedded; propagation delay arises solely from RON × CLOAD RC time constant (≤0.25 ns typical at 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RON (ON Resistance) | 5 Ω typical at VCC = 5V, VIN = 0V - ensures minimal signal attenuation and <0.25 ns RC delay with 50 pF load |
| VIN Range | –0.5 V to +7 V - supports 5V/3.3V/2.5V mixed-voltage bus isolation without external level shifters |
| tPLH / tPHL | Not applicable - zero intrinsic propagation delay; system delay determined only by driving source and load capacitance |
| IOZ (Off-State Current) | ±1 μA max - guarantees high-impedance isolation between buses during disable, critical for hot-swap safety |
| VIL / VIH | 0.8 V max / 2.0 V min - TTL-compatible control thresholds ensure interoperability with legacy 74-series logic drivers |
| ICCQ | 3 μA max - ultra-low quiescent current enables use in always-on power domains without thermal penalty |
| Operating Temp | –40°C to +85°C - validated for industrial control, telecom line cards, and embedded computing environments |
Pinout & Package
QS3244PAG is supplied in a 20-pin QSOP (Quarter Size Outline Package) with 0.65 mm pitch, JEDEC MO-137AC compliant, and RoHS-compliant green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-Low Enable Inputs | Independent group controls: 1G enables 1A1–1Y4; 2G enables 2A1–2Y4 - supports selective bus partitioning |
| 1A1–1A4, 2A1–2A4 | Data Input/Output Terminals (Group 1 & 2) | Bidirectional I/Os - no direction pin required; signal flows either way when enabled |
| 1Y1–1Y4, 2Y1–2Y4 | Data Input/Output Terminals (Group 1 & 2) | Paired with respective A pins - each A-Y pair forms one switch channel |
| VCC | Positive Supply | 5V ±5% supply - powers internal clamp diodes and gate drive; not used for signal pass path |
| GND | Ground Reference | Common return for all control and I/O signals - must be low-impedance for ground-bounce-free switching |
Key Features
| Feature | Design Value |
|---|---|
| Zero propagation delay architecture | Eliminates timing budget overhead in high-speed data paths - delay depends only on external R/C, not device internals |
| Undershoot clamp diodes on all I/Os | Protects downstream logic from negative transients during hot-plug events, meeting IEC 61000-4-2 Level 4 immunity requirements |
| 5Ω bidirectional ON resistance | Enables <10 mV drop at 2 mA signal current - preserves logic margins across voltage-translated buses |
| Pin compatibility with 74F244/74FCT244 | Allows drop-in replacement in existing designs without PCB rework - same pin count, function, and footprint |
| Industrial temperature range | Validated operation from –40°C to +85°C - suitable for uncontrolled ambient environments in factory automation and outdoor infrastructure |
Applications
| Hot-Swappable Backplane Interface | Voltage-Translated Data Bus |
|---|---|
Use Scenario: Insertion/removal of line cards in telecom chassis while main backplane remains powered. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side and backplane-side signal lines during insertion sequence. Use Value: Prevents bus contention and ground bounce via Hi-Z isolation; undershoot clamps absorb connector arcing transients. | Use Scenario: Interfacing a 3.3V FPGA I/O bank to a legacy 5V peripheral bus. IC Role / Device Role / Timing Role: Passive voltage-level translator enabling DC-coupled signal pass without timing skew or level-shifter latency. Use Value: 5Ω RON maintains signal integrity across 5V↔3.3V boundary; no additional power supply or biasing required. |
| Low-Power Clock Gating | Capacitance-Isolated Test Access Port |
Use Scenario: Dynamic disabling of clock distribution to idle IP blocks in ASIC subsystems. IC Role / Device Role / Timing Role: Transparent clock path switch controlled by power management unit to gate clock edges. Use Value: Zero propagation delay preserves clock duty cycle; sub-μA ICCQ avoids leakage-induced wake-up in deep sleep modes. | Use Scenario: Isolating JTAG TDI/TDO lines between test equipment and production board during functional testing. IC Role / Device Role / Timing Role: Signal isolation barrier preventing tester-induced noise from coupling into sensitive analog sections. Use Value: 7 pF off-state capacitance minimizes crosstalk; Hi-Z state eliminates loading on target device's TAP controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244PWR | Same 8-bit dual-enable bus switch; RON = 6 Ω typical; VCC range 4.5–5.5 V; no undershoot clamps on I/Os | Lacks integrated transient protection - requires external TVS for hot-swap use | Preferred where cost sensitivity outweighs robustness requirements and external protection is acceptable |
| 74LVC244APW | 3.3V-only octal buffer with 3-state outputs; not bidirectional; RON not specified; no voltage translation capability | Unidirectional only; incompatible with 5V systems without level shifters | Suitable only for native 3.3V logic isolation with strict voltage domain separation |
Compared with SN74CBT3244PWR and 74LVC244APW, the QS3244PAG uniquely combines bidirectional 5V-tolerant switching, integrated undershoot clamps, and true zero-delay transparency - making it the only option qualified for industrial hot-swap and mixed-voltage backplane isolation without supplemental components.
Availability
QS3244PAG is available at Aetrix Electronics and suitable for hot-swappable backplane interfaces, voltage-translated data buses, and low-power clock gating applications requiring stable component supply across extended product lifecycles.
Supply support for QS3244PAG 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 enterprise applications.
The QS3244PAG belongs to Renesas' QuickSwitch® bus switch family, engineered specifically for high-speed, low-latency signal routing in modular, hot-pluggable, and mixed-voltage electronic systems.
FAQ
What is the maximum allowable input voltage on A/Y pins of the QS3244PAG?
The QS3244PAG supports DC input voltages from –0.5 V to +7 V on all A and Y pins, independent of VCC. This allows safe interfacing with 5V, 3.3V, and 2.5V logic families without level shifters, and protects against negative transients down to –0.5 V due to integrated undershoot clamp diodes.
Does the QS3244PAG require external pull-up or pull-down resistors on its enable inputs?
No, the QS3244PAG does not require external biasing on 1G or 2G pins. Its control inputs exhibit ±1 μA max leakage current over temperature, and VIH/VIL thresholds (2.0 V min / 0.8 V max) are fully compatible with standard TTL and CMOS logic outputs - direct connection to FPGA or microcontroller GPIO is sufficient.
Can the QS3244PAG be used for analog signal switching, such as audio or sensor signals?
The QS3244PAG is specified and characterized only for digital bus switching applications. While its 5Ω RON and rail-to-rail pass capability may suggest analog use, it lacks guaranteed THD, bandwidth, or crosstalk specs for analog signals. Renesas does not characterize or warrant the QS3244PAG for continuous analog waveform switching.
What is the thermal performance of the QS3244PAG in QSOP-20 package at full load?
In QSOP-20 package, the QS3244PAG has a maximum power dissipation of 0.5 W at TA = +85°C. With typical RON = 5 Ω and worst-case IOUT = 120 mA per channel, total power per enabled channel is <75 mW - well within thermal limits even with all eight channels active under industrial ambient conditions.
Is the QS3244PAG pin-compatible with the original IDT QS3244 devices?
Yes, the QS3244PAG is a direct continuation of the IDT QS3244 product line following Renesas' acquisition of IDT. It retains identical pinout, electrical specifications, package dimensions, and marking layout - including full compatibility with 74FCT244/74F244 footprints and function tables.
QS3244PAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 2
- 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-TSSOP
QS3244PAG FAQ
1.How can I place an order for QS3244PAG through Aetrix?
Please submit a Request for Quotation (RFQ) for QS3244PAG 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 QS3244PAG reliable?
The price and inventory of QS3244PAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QS3244PAG is usually 5 days.
3.What payment methods are accepted for QS3244PAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QS3244PAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QS3244PAG?
QS3244PAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QS3244PAG 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 QS3244PAG?
For technical support, including QS3244PAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QS3244PAG requirements.
6.How does Aetrix verify that QS3244PAG is sourced from the original manufacturer or authorized distributors?
All QS3244PAG 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 QS3244PAG meets industry standards.
7.What is the process for return or replacement of QS3244PAG?
All QS3244PAG units undergo pre-shipment inspection (PSI). If there is an issue with QS3244PAG, 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 QS3244PAG part is unused and in its original packaging.
Return procedure for QS3244PAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
QS3244PAG 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…
