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Texas Instruments SN74LVC244APWRE4
- Part No.:
- SN74LVC244APWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC244APWRE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,362
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Product details
Overview
SN74LVC244APWRE4 from Texas Instruments is an octal 3-state buffer/driver IC designed for asynchronous bus interfacing in 1.65V–3.6V systems. It provides two independent 4-bit banks (1A/1Y and 2A/2Y), each controlled by its own output-enable pin (1OE, 2OE), delivers ≤5.9ns propagation delay at 3.3V, supports 5.5V-tolerant inputs, and operates across –40°C to +125°C - enabling use in industrial I/O expansion and LED display column drivers.
For engineers reviewing the SN74LVC244APWRE4 datasheet, SN74LVC244APWRE4 pinout, SN74LVC244APWRE4 application, or SN74LVC244APWRE4 equivalent, this page delivers verified package mapping (TSSOP-20), confirmed 3-state logic behavior, mixed-voltage translation capability (5.5V→VCC), Ioff partial-power-down support, and real-world signal integrity guidance for trace lengths >12 cm.
Technical Context
The SN74LVC244APWRE4 implements two independent 4-bit noninverting buffers with CMOS 3-state outputs per bank. Each bank's four outputs are simultaneously enabled or disabled via dedicated OE pins, supporting bidirectional bus isolation without contention. Its balanced drive strength (±24mA at 3V) enables fast edge rates into light loads while requiring careful PCB routing to suppress ringing.
It features standard CMOS inputs with 5.5V overvoltage tolerance, Ioff circuitry that disables all outputs at VCC = 0V for live insertion, and clamp diodes on all I/Os for ESD protection. The device is not a level shifter by architecture but functions as a down-translator due to input voltage rating exceeding VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - defines compatible supply rails for low-voltage digital systems including 1.8V and 3.3V domains. |
| Input Voltage Max | 5.5V - allows direct connection to 5V logic signals without external level-shifting components. |
| tpd (Max) | 5.9ns at 3.3V - ensures sub-6ns propagation delay for high-speed data buffering in timing-critical interfaces. |
| IOL / IOH | ±24mA at 3V - provides robust drive capability for driving LEDs, long PCB traces, or multiple CMOS inputs. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and telecom infrastructure environments. |
| Ioff Support | Active at VCC = 0V - enables safe hot-plug operation and prevents back-drive current during partial power-down. |
| ESD Rating | ±2000V HBM - meets industrial-grade electrostatic discharge immunity requirements per ANSI/ESDA/JEDEC JS-001. |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body size, 0.65mm pitch, exposed thermal pad optional, RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight buffered data inputs grouped into two 4-bit banks; each bank maps directly to corresponding Y outputs. |
| 1Y1–1Y4, 2Y1–2Y4 | Output | Eight 3-state CMOS outputs; high-impedance when respective OE is high; driven low/high when OE is low. |
| 1OE, 2OE | Input | Active-low enable controls for Bank 1 and Bank 2; both must be low for output assertion; tie to VCC via pull-up for power-up high-Z. |
| VCC | Power | Primary supply pin (Pin 20); requires local 0.1µF bypass capacitor placed adjacent to pin for noise suppression. |
| GND | Ground | Reference return (Pin 10); must connect to solid ground plane to minimize switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables 5V input signals to interface safely with 3.3V or 1.8V system buses without damage or level shifters. |
| Ioff partial-power-down | Prevents current backflow and protects downstream circuitry when VCC is unpowered - critical for hot-swap I/O modules. |
| Balanced CMOS 3-state outputs | Delivers matched sourcing/sinking capability (±24mA), ensuring clean signal edges and predictable bus termination behavior. |
| Ultra-low dynamic power | Typical ICC of 1µA at 3.6V (disabled state) and Cpd = 2pF (3.3V) minimizes standby and switching power in battery-sensitive designs. |
| High noise immunity | VIH/VIL thresholds scale with VCC (e.g., VIH = 0.65×VCC min), maintaining reliable logic margins across voltage range. |
Applications
| Industrial I/O Expansion | LED Display Column Driving |
|---|---|
Use Scenario: Expanding microcontroller GPIO count to manage 32+ discrete sensors or actuators in PLC modules. IC Role / Device Role / Timing Role: Octal buffer isolates MCU pins from field-side transients while providing 24mA drive per channel for relay coils or optocouplers. Use Value: Eliminates need for discrete MOSFETs or Darlington arrays; Ioff prevents backfeed during controller reset or firmware update. |
Use Scenario: Driving 8-column segments of a 16×8 LED matrix in signage or instrumentation panels. IC Role / Device Role / Timing Role: Acts as column sink driver with precise 3-state control synchronized to row-scanning clock. Use Value: 5.5V-tolerant inputs accept 5V scan controller logic; 24mA per output sustains full brightness at 1/8 duty cycle without external drivers. |
| Network Switch Backplane Buffering | Motor Driver Interface Isolation |
Use Scenario: Isolating CPU address/data buses from PHY-layer transceivers in managed Ethernet switches. IC Role / Device Role / Timing Role: Bidirectional buffer with independent OE control separates master and slave timing domains and prevents bus contention. Use Value: 5.9ns tpd ensures setup/hold compliance at 100MHz bus speeds; TSSOP-20 footprint fits dense switch ASIC layouts. |
Use Scenario: Interfacing MCU PWM outputs to gate drivers in BLDC motor controllers with isolated power domains. IC Role / Device Role / Timing Role: Level-translating buffer converts 3.3V MCU logic to 5V-compatible gate drive signals while blocking reverse current. Use Value: Input overvoltage tolerance eliminates level-shifter ICs; Ioff blocks fault current if gate driver VDD drops unexpectedly. |
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; identical VCC range and drive strength; slightly higher ICC (10µA typical). | Eliminates need for external pull-up/down resistors on unused or floating inputs - beneficial in low-pin-count MCU interfaces. | Choose SN74LVCH244A when input stability without external biasing is required; otherwise SN74LVC244APWRE4 offers lower static power. |
| 74LVC244AD | SOIC-20 package (12.8mm × 10.3mm); same electrical specs; higher RθJA (114.8°C/W vs. 120.3°C/W for TSSOP). | Suitable for through-hole prototyping or legacy board upgrades where TSSOP rework is impractical. | Choose 74LVC244AD only when SOIC footprint compatibility is mandatory; SN74LVC244APWRE4 provides superior thermal performance per mm². |
Compared with SN74LVCH244A and 74LVC244AD, the SN74LVC244APWRE4 delivers optimal balance of ultra-small TSSOP-20 footprint, lowest quiescent current, and proven reliability in high-density industrial PCBs - making it preferred for space-constrained, thermally sensitive, and cost-optimized production designs.
Availability
SN74LVC244APWRE4 is available at Aetrix Electronics and suitable for industrial I/O expansion, LED display column driving, network switch backplane buffering, motor driver interface isolation, and telecom infrastructure signal routing requiring stable component supply and long-term lifecycle assurance.
Supply support for SN74LVC244APWRE4 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 for industrial, automotive, and communications markets.
The SN74LVC244APWRE4 belongs to TI's LVC logic family - engineered for low-voltage, high-speed, 3-state bus interface applications with robust mixed-signal interoperability and industrial temperature resilience.
FAQ
What is the maximum input voltage rating for SN74LVC244APWRE4?
The SN74LVC244APWRE4 supports input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic families while operating from 1.65V–3.6V supplies. This overvoltage tolerance is specified in the Recommended Operating Conditions table and verified across –40°C to +125°C ambient temperature.
Does SN74LVC244APWRE4 support partial power-down operation?
Yes, SN74LVC244APWRE4 includes Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive current and enabling safe live insertion into powered-backplane systems. This feature is explicitly documented in Section 7.3.2 and validated per JEDEC JESD78.
What is the propagation delay of SN74LVC244APWRE4 at 3.3V?
The maximum propagation delay (tpd) of SN74LVC244APWRE4 is 5.9ns at VCC = 3.3V ± 0.3V and TA = 25°C, as specified in Table 5.6. Typical values range from 3.9ns to 5.7ns depending on load capacitance and transition direction.
Can SN74LVC244APWRE4 drive LEDs directly?
Yes, SN74LVC244APWRE4 can drive LEDs directly with up to 24mA per output at 3V VCC, sufficient for standard indicator LEDs at full brightness. Its 3-state outputs allow multiplexed control, and the 5.5V input tolerance permits direct connection to 5V LED column drivers.
What package type is used for SN74LVC244APWRE4?
SN74LVC244APWRE4 uses the TSSOP-20 (PW) package: 6.50mm × 6.4mm body size, 0.65mm lead pitch, with GND and VCC pins positioned for optimal decoupling. Pinout matches industry-standard 20-pin TSSOP logic devices and is fully documented in Figure 4-2 of the datasheet.
SN74LVC244APWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74LVC244APWRE4 FAQ
1.How can I place an order for SN74LVC244APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244APWRE4 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 SN74LVC244APWRE4 reliable?
The price and inventory of SN74LVC244APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC244APWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC244APWRE4 transactions.
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4.How is shipping managed for SN74LVC244APWRE4?
SN74LVC244APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244APWRE4 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 SN74LVC244APWRE4?
For technical support, including SN74LVC244APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244APWRE4 requirements.
6.How does Aetrix verify that SN74LVC244APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC244APWRE4 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 SN74LVC244APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC244APWRE4?
All SN74LVC244APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244APWRE4, 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 SN74LVC244APWRE4 part is unused and in its original packaging.
Return procedure for SN74LVC244APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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