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Texas Instruments SN74LVC244APWE4
- Part No.:
- SN74LVC244APWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC244APWE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,118
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Product details
Overview
SN74LVC244APWE4 from Texas Instruments is an octal 3-state buffer/driver IC designed for asynchronous bus interfacing in 1.65V–3.6V systems. It features dual 4-bit banks, 5.9ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion-used in server backplanes and telecom infrastructure signal routing.
For engineers reviewing the SN74LVC244APWE4 datasheet, SN74LVC244APWE4 pinout, SN74LVC244APWE4 application, or SN74LVC244APWE4 equivalent, key selection criteria include VCC operating range (1.65–3.6V), 3-state output control per bank, mixed-mode voltage translation capability, and thermal performance in TSSOP-20 packaging.
Technical Context
The SN74LVC244APWE4 implements two independent 4-bit noninverting buffer banks, each controlled by a dedicated output-enable input (1OE, 2OE). Its CMOS architecture delivers balanced sourcing/sinking drive (±24mA at 3V) with rail-to-rail output swing and low ground bounce (<0.8V typical at VCC=3.3V).
It supports partial-power-down operation via Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive and enabling hot-swap capability. Input tolerance up to 5.5V allows safe interfacing with 5V logic while powered from 3.3V or lower supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables direct integration into modern low-voltage digital systems without level-shifting. |
| Input Voltage Tolerance | Up to 5.5V - Allows connection to legacy 5V buses while operating from 3.3V supply. |
| Max Propagation Delay | 5.9ns at 3.3V - Supports high-speed data transfer across PCB traces up to ~12cm without signal integrity degradation. |
| Output Drive Strength | ±24mA at VCC = 3V - Sufficient to drive multiple CMOS loads or moderate capacitive traces without external buffering. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and extended-temperature embedded applications. |
| Ioff Current | ±20µA at VCC = 0V - Ensures zero current flow during live insertion or partial power-down states. |
| ESD Rating (HBM) | ±2000V - Meets standard handling requirements for automated assembly and field service environments. |
Pinout & Package
Packaged in a 20-pin TSSOP (PW), the SN74LVC244APWE4 measures 6.50mm × 6.4mm with 4.40mm body width and exposed thermal pad-compatible footprint. Pin pitch is 0.65mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input (8 total) | Noninverting data inputs for two independent 4-bit banks; accept 0–5.5V regardless of VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | Output (8 total) | 3-state buffered outputs; high-impedance when corresponding OE is high. |
| 1OE, 2OE | Input (2) | Active-low enable controls for Bank 1 and Bank 2; both must be low for output assertion. |
| VCC | Power | Primary supply (1.65–3.6V); powers internal logic and output drivers. |
| GND | Ground | Reference return path for all signals and power; requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables 5V input signals to interface directly with 3.3V/2.5V/1.8V system buses without external translators. |
| Ioff partial-power-down protection | Prevents current backflow and bus contention during hot-plug events or system sleep modes. |
| Balanced CMOS 3-state outputs | Provides matched rise/fall times and symmetrical drive strength for clean signal edges on shared buses. |
| Low ground bounce (VOLP) | <0.8V typical at VCC=3.3V ensures stable reference for adjacent logic and reduces EMI in dense layouts. |
| Ultra-small TSSOP package | 6.5mm × 6.4mm footprint supports high-density board designs while maintaining manufacturability. |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
|
Use Scenario: Isolating and driving address/data lines between CPU module and expansion slot in rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state control enabling dynamic bus sharing among multiple peripherals. Use Value: 5.9ns propagation delay and ±24mA drive ensure reliable timing margin across 10+ inch backplane traces at 100MHz clock rates. |
Use Scenario: Driving common-anode LED columns in large-format outdoor displays requiring high-current sink capability. IC Role / Device Role / Timing Role: Low-side driver translating microcontroller GPIO outputs to segmented display column signals. Use Value: 5.5V-tolerant inputs allow direct connection to 5V LED supply rails while MCU operates at 3.3V, eliminating discrete level shifters. |
| Network Switch Control Plane | Industrial I/O Expander Interface |
|
Use Scenario: Buffering configuration signals between management processor and PHY registers in multi-port Ethernet switches. IC Role / Device Role / Timing Role: Signal isolator and fanout amplifier ensuring noise-immune communication over long PCB runs. Use Value: Ioff support enables safe firmware updates without powering down PHYs, reducing system downtime during maintenance. |
Use Scenario: Extending GPIO count of PLC controllers to manage relay banks, sensor inputs, and status indicators. IC Role / Device Role / Timing Role: Parallel port expander providing additional bidirectional digital I/O channels with configurable direction per bank. Use Value: –40°C to +125°C rating guarantees operation in uncooled control cabinets; 3-state outputs prevent bus conflicts during hot-swap I/O module replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH244A | Includes bus-hold circuitry on all inputs; higher ICC (max 40µA vs. 10µA); same VCC range and pinout. | Preferred where unused inputs may float (e.g., modular connectors), but adds minor static power overhead. | Select SN74LVCH244A only if bus-hold functionality is required; otherwise SN74LVC244APWE4 offers lower quiescent current. |
| 74LVC244AD | SOIC-20 package (12.8mm × 10.3mm); identical electrical specs; no thermal pad; higher RθJA (114.8°C/W vs. 120.3°C/W). | Suitable for through-hole prototyping or legacy SOIC footprints, but less thermally efficient than TSSOP. | Choose 74LVC244AD only for compatibility with existing SOIC layouts; SN74LVC244APWE4 provides better thermal performance and smaller area. |
Compared with SN74LVCH244A and 74LVC244AD, the SN74LVC244APWE4 delivers optimal balance of low static power, compact TSSOP packaging, and proven reliability in high-volume industrial bus interfaces-without unnecessary feature bloat or footprint compromise.
Availability
SN74LVC244APWE4 is available at Aetrix Electronics and suitable for server backplanes, LED display drivers, and network switch control planes requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature extremes.
Supply support for SN74LVC244APWE4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability digital interface components.
The SN74LVC244APWE4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for robust 1.65V–3.6V operation in space-constrained, thermally demanding industrial and communications equipment.
FAQ
What is the maximum operating voltage for SN74LVC244APWE4 inputs?
The SN74LVC244APWE4 inputs tolerate up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic families while operating from 3.3V, 2.5V, or 1.8V supplies. This eliminates the need for external level translators in mixed-voltage systems and is confirmed in Section 5.3 of the official datasheet under "Recommended Operating Conditions" for VI.
Does SN74LVC244APWE4 support hot-swap or live insertion?
Yes, SN74LVC244APWE4 supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter high-impedance state with leakage current limited to ±20µA, preventing back-drive and bus contention. This behavior is specified in Section 5.5 Electrical Characteristics under Ioff and validated across –40°C to +125°C ambient conditions.
What is the propagation delay of SN74LVC244APWE4 at 3.3V?
The maximum propagation delay (tpd) of SN74LVC244APWE4 is 5.9ns at VCC = 3.3V ± 0.3V and TA = 25°C, as specified in Table 5.6 Switching Characteristics. Typical values range from 3.9ns to 5.7ns depending on load capacitance and transition direction, supporting reliable timing closure in sub-100MHz digital interfaces.
Can SN74LVC244APWE4 drive multiple CMOS loads simultaneously?
Yes, SN74LVC244APWE4 can drive up to 10 LVC/LVT loads per output (per TI application note SCBA031), with guaranteed output drive of ±24mA at VCC = 3V. Its balanced CMOS outputs maintain fast edge rates even under light capacitive loads, though layout best practices (e.g., series damping resistors for traces >12cm) are recommended to suppress ringing.
Is SN74LVC244APWE4 RoHS compliant and lead-free?
Yes, SN74LVC244APWE4 is RoHS-compliant and lead-free, as confirmed by Texas Instruments' official product change notification (PCN) and material declaration. The "E4" suffix denotes TI's green packaging standard, including matte tin lead finish and halogen-free molding compound, fully compliant with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1).
SN74LVC244APWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVC244APWE4 FAQ
1.How can I place an order for SN74LVC244APWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244APWE4 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 SN74LVC244APWE4 reliable?
The price and inventory of SN74LVC244APWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244APWE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC244APWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC244APWE4 transactions.
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4.How is shipping managed for SN74LVC244APWE4?
SN74LVC244APWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244APWE4 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 SN74LVC244APWE4?
For technical support, including SN74LVC244APWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244APWE4 requirements.
6.How does Aetrix verify that SN74LVC244APWE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC244APWE4 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 SN74LVC244APWE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC244APWE4?
All SN74LVC244APWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244APWE4, 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 SN74LVC244APWE4 part is unused and in its original packaging.
Return procedure for SN74LVC244APWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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