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NXP Semiconductors 74LVT244APW/AUJ
- Part No.:
- 74LVT244APW/AUJ
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVT244APW/AUJ.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,781
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Product details
Overview
74LVT244APW/AUJ from Nexperia is a 3.3 V octal buffer/line driver with 3-state outputs, designed for high-speed bus interface applications in industrial and embedded systems. It functions as two independent 4-bit buffers or one 8-bit buffer, features dual active-low output enables (1OE, 2OE), delivers ±32 mA/±64 mA drive capability, and operates across -40 °C to +85 °C.
For engineers reviewing the 74LVT244APW/AUJ datasheet, 74LVT244APW/AUJ pinout, 74LVT244APW/AUJ application, or 74LVT244APW/AUJ equivalent, this device supports TTL-level interfacing, overvoltage-tolerant inputs up to 5.5 V, bus-hold inputs eliminating external pull-ups, and live insertion-critical for hot-swap backplane and modular I/O designs.
Technical Context
The 74LVT244APW/AUJ implements BiCMOS logic architecture to achieve high-speed propagation delays (tPLH/tPHL ≤ 4.1 ns at VCC = 3.3 V) while maintaining robust output drive. Its dual 4-bit enable structure allows independent control of two output groups (1Y0–1Y3 and 2Y0–2Y3), enabling selective bus isolation without affecting parallel data paths.
IOFF circuitry ensures partial power-down mode operation when VCC = 0 V, limiting off-state leakage to ±100 μA. Bus-hold inputs actively maintain valid logic states on unused pins (IBHL = 75–150 μA LOW, IBHH = −75 to −150 μA HIGH), preventing floating-input noise sensitivity and system instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.7 V to 3.6 V - compatible with 3.3 V system rails and tolerant of typical board-level ripple and droop |
| Output drive | +64 mA sink / −32 mA source - sufficient to drive heavy capacitive loads (e.g., >50 pF buses) and multiple TTL inputs |
| Input voltage tolerance | Up to 5.5 V - enables direct connection to 5 V logic without level shifters in mixed-voltage systems |
| Propagation delay | ≤ 4.1 ns (tPLH/tPHL at VCC = 3.3 V) - supports >200 MHz bus toggle rates in point-to-point or lightly loaded configurations |
| Operating temperature | −40 °C to +85 °C - qualified for industrial ambient environments without derating |
| Bus hold current | ±75 μA to ±150 μA - maintains stable input state without external biasing, reducing BOM count and layout area |
| ESD rating | HBM > 2000 V, CDM > 1000 V - meets JEDEC JS-001/JS-002 Class 2/C3 for robust handling in manufacturing and field service |
Pinout & Package
TSSOP20 package (SOT360-1): plastic thin shrink small outline, 20-lead, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls Group 1 (1Y0–1Y3) and Group 2 (2Y0–2Y3) independently |
| 2, 4, 6, 8 | 1A0–1A3 | Data inputs for first 4-bit buffer group; accept 0–5.5 V logic levels |
| 11, 13, 15, 17 | 2A0–2A3 | Data inputs for second 4-bit buffer group; fully independent of Group 1 |
| 18, 16, 14, 12 | 1Y0–1Y3 | 3-state outputs for Group 1; high-impedance when 1OE = HIGH |
| 9, 7, 5, 3 | 2Y0–2Y3 | 3-state outputs for Group 2; high-impedance when 2OE = HIGH |
| 10 | GND | Ground reference (0 V); required for all internal logic and output stages |
| 20 | VCC | 3.3 V supply input; powers internal BiCMOS circuitry and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Withstands up to 5.5 V regardless of VCC level - eliminates need for external clamping or level translation in 3.3 V/5 V mixed systems |
| Bus-hold circuitry | Actively holds unused inputs at valid logic states (LOW/HIGH) - removes requirement for external pull-up/pull-down resistors and associated layout space |
| IOFF partial power-down | Leakage limited to ±100 μA when VCC = 0 V - prevents back-driving and signal corruption during hot-swap or power sequencing |
| Live insertion/extraction support | Power-up 3-state and controlled output disable timing (tPZH/tPLZ ≤ 5.6 ns) - enables safe module replacement in powered-backplane systems |
| TTL-compatible interface | Accepts standard TTL input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) - interoperable with legacy 5 V logic without interface logic |
Applications
| Industrial Backplane Interface | Modular I/O Expansion |
|---|---|
|
Use Scenario: Isolating and driving parallel address/data buses between CPU modules and plug-in peripheral cards in programmable logic controllers. IC Role / Device Role / Timing Role: 3-state octal buffer providing bidirectional bus isolation, timing-critical signal conditioning, and load matching for 20+ cm trace lengths. Use Value: Dual OE control enables per-slot enable/disable without global bus reset; ±64 mA drive ensures signal integrity across long PCB traces and connector interfaces. |
Use Scenario: Interfacing microcontroller GPIO banks to external sensor/actuator daughterboards via standardized 20-pin headers. IC Role / Device Role / Timing Role: Level-translating buffer with bus-hold protection, used to extend MCU I/O drive capability and prevent floating inputs during hot-plug events. Use Value: 5.5 V input tolerance allows direct connection to 5 V sensors; bus-hold eliminates need for header-side pull resistors, simplifying daughterboard design. |
| Embedded Memory Subsystem | Test Equipment Signal Conditioning |
|
Use Scenario: Driving SRAM or Flash memory address lines in resource-constrained edge devices where PCB real estate and power are tightly constrained. IC Role / Device Role / Timing Role: Low-latency (≤4.1 ns) buffer ensuring setup/hold timing margins for high-speed memory access cycles. Use Value: Fast propagation delay preserves timing margins at 100+ MHz bus frequencies; low ICC (0.19 mA max) minimizes standby power in always-on subsystems. |
Use Scenario: Conditioning digital stimulus and response signals in automated test equipment (ATE) channel interface boards with mixed-voltage DUTs. IC Role / Device Role / Timing Role: Reconfigurable bus driver supporting both 3.3 V and 5 V DUT signaling standards via overvoltage-tolerant inputs and 3-state outputs. Use Value: Single device replaces multiple level translators; IOFF and live-insertion support enable reconfiguration without powering down the main test controller. |
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 |
|---|---|---|---|
| 74LVT244AD | SO20 package (7.5 mm width, 1.27 mm pitch) vs. TSSOP20 (4.4 mm width, 0.65 mm pitch) | Requires larger PCB footprint and less dense routing; better thermal dissipation in high-power continuous operation | Select for legacy board compatibility, manual assembly, or higher thermal mass requirements |
| SN74LVC244APWR | Lower drive (±24 mA), narrower VCC range (1.65–3.6 V), no bus-hold or 5.5 V input tolerance | Not suitable for 5 V-tolerant or high-drive industrial backplanes; requires external pull resistors on unused inputs | Select only for cost-sensitive, low-power consumer applications with strictly 3.3 V-only signaling |
Compared with 74LVT244AD and SN74LVC244APWR, the 74LVT244APW/AUJ uniquely combines 5.5 V input tolerance, ±64 mA drive, integrated bus-hold, and TSSOP20 density-making it optimal for space-constrained industrial modules requiring robust mixed-voltage interfacing.
Availability
74LVT244APW/AUJ is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular I/O expansion, embedded memory subsystems, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVT244APW/AUJ 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
Nexperia is a leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in automotive-grade and industrial reliability.
The 74LVT244APW/AUJ belongs to Nexperia's LVT (Low-Voltage TTL) logic family, engineered for high-speed, low-power 3.3 V bus interfacing in industrial automation, communications infrastructure, and embedded computing.
FAQ
What is the maximum input voltage the 74LVT244APW/AUJ can tolerate?
The 74LVT244APW/AUJ accepts input voltages up to 5.5 V regardless of VCC level, enabling direct interfacing with 5 V logic families without external level-shifting circuitry. This overvoltage tolerance is specified under recommended operating conditions and does not require VCC to be powered for safe input application.
Does the 74LVT244APW/AUJ include bus-hold functionality, and how does it work?
Yes, the 74LVT244APW/AUJ integrates bus-hold circuitry on all data inputs (1A0–1A3, 2A0–2A3). When an input is left unconnected, the bus-hold feature actively maintains its last-valid logic state using ±75 μA to ±150 μA feedback current-eliminating the need for external pull-up or pull-down resistors and preventing metastability or noise-induced switching.
What is the propagation delay performance of the 74LVT244APW/AUJ at 3.3 V?
At VCC = 3.3 V and Tamb = 25 °C, the 74LVT244APW/AUJ achieves typical propagation delays of 2.5 ns (tPLH) and 2.6 ns (tPHL) from input to output, with maximum values of 4.1 ns. These values ensure reliable operation in systems requiring sub-5 ns timing margins, such as high-speed memory addressing or synchronous bus transfers.
Can the 74LVT244APW/AUJ be used in hot-swap applications?
Yes, the 74LVT244APW/AUJ supports live insertion and extraction due to its power-up 3-state behavior, IOFF circuitry (limiting off-state leakage to ±100 μA when VCC = 0 V), and controlled enable timing (tPZH/tPLZ ≤ 5.6 ns). These features prevent bus contention and back-driving during module insertion into a powered backplane.
What package type is used for the 74LVT244APW/AUJ, and what are its key mechanical dimensions?
The 74LVT244APW/AUJ uses the TSSOP20 package (SOT360-1): 20-lead, 4.4 mm body width, 0.65 mm lead pitch, and 1.1 mm maximum height. Its compact footprint and fine pitch support high-density PCB layouts, while the exposed thermal pad (non-connected) aids heat dissipation in thermally constrained modules.
74LVT244APW/AUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVT244APW/AUJ FAQ
1.How can I place an order for 74LVT244APW/AUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT244APW/AUJ 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 74LVT244APW/AUJ reliable?
The price and inventory of 74LVT244APW/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT244APW/AUJ is usually 5 days.
3.What payment methods are accepted for 74LVT244APW/AUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT244APW/AUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT244APW/AUJ?
74LVT244APW/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT244APW/AUJ 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 74LVT244APW/AUJ?
For technical support, including 74LVT244APW/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT244APW/AUJ requirements.
6.How does Aetrix verify that 74LVT244APW/AUJ is sourced from the original manufacturer or authorized distributors?
All 74LVT244APW/AUJ 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 74LVT244APW/AUJ meets industry standards.
7.What is the process for return or replacement of 74LVT244APW/AUJ?
All 74LVT244APW/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT244APW/AUJ, 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 74LVT244APW/AUJ part is unused and in its original packaging.
Return procedure for 74LVT244APW/AUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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