Texas Instruments SN74LVC2244APWG4

Overview

SN74LVC2244APWG4 from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for 1.65 V to 3.6 V V_CC operation. It features two independent 4-bit sections (1A–1Y and 2A–2Y), each with dedicated output-enable (1OE/2OE), supports 5.5 V-tolerant inputs, includes integrated 26-Ω series output resistors, and delivers 5.5 ns max propagation delay at 3.3 V - used in mixed-voltage I/O interfacing between 3.3 V logic and 5 V peripherals.

For engineers reviewing the SN74LVC2244APWG4 datasheet, SN74LVC2244APWG4 pinout, SN74LVC2244APWG4 application, or SN74LVC2244APWG4 equivalent, key selection criteria include 3-state drive capability, I_off support for live insertion, overvoltage-tolerant inputs, thermal performance in TSSOP-20, and compatibility with 1.65–3.6 V supply rails in space-constrained industrial and communications systems.

Technical Context

The SN74LVC2244APWG4 implements dual 4-bit noninverting buffers with independent 3-state control per section. Each output drives up to ±12 mA while incorporating on-die 26-Ω series termination to suppress overshoot/undershoot without external resistors.

Its I_off circuitry ensures high-impedance isolation when V_CC = 0 V, enabling safe partial-power-down and back-drive protection. Input voltage tolerance extends to 5.5 V regardless of V_CC, supporting bidirectional level translation in mixed-voltage systems.

Key Specifications

Pinout & Package

TSSOP-20 package (6.50 mm × 4.40 mm body size, 0.65 mm pitch), lead-free with NiPdAu finish, MSL Level-1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer applications.

Compared with SN74LVC2244APWG4, SN74LVC244APWR offers identical functionality in alternate packaging for layout flexibility, while 74LVC244ABQ provides a validated second-source option with enhanced HBM tolerance - both require no redesign but differ in supply chain availability and qualification scope.

Availability

SN74LVC2244APWG4 is available at Aetrix Electronics and suitable for industrial PLC expansion, embedded CPU bus buffering, and test equipment signal conditioning requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVC2244APWG4 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 and embedded processing technologies, with decades of expertise in logic, interface, and power management ICs.

The SN74LVC2244APWG4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage interoperability in space-constrained industrial and communications systems.

FAQ

What is the maximum input voltage the SN74LVC2244APWG4 can tolerate?

The SN74LVC2244APWG4 accepts input voltages up to 5.5 V across its entire specified V_CC range (1.65 V to 3.6 V). This overvoltage tolerance is guaranteed per the Absolute Maximum Ratings table and enables direct interfacing with 5 V logic without external clamping or level-shifting circuitry. The SN74LVC2244APWG4 maintains this rating regardless of whether V_CC is at 1.65 V, 2.5 V, or 3.3 V - a key enabler for mixed-voltage system design.

Does the SN74LVC2244APWG4 support partial power-down operation?

Yes, the SN74LVC2244APWG4 supports partial power-down via its I_off feature. When V_CC = 0 V, the I_off circuitry disables all outputs and limits input/output leakage to ±10 μA, preventing damaging back-current flow from powered sections into unpowered ones. This capability is explicitly verified in the Electrical Characteristics table and is critical for hot-swap applications such as modular instrumentation or field-replaceable I/O cards using the SN74LVC2244APWG4.

What is the purpose of the 26-Ω series resistors on the SN74LVC2244APWG4 outputs?

The SN74LVC2244APWG4 integrates 26-Ω series resistors on each output to dampen signal reflections and reduce overshoot/undershoot in high-speed digital traces. As confirmed in the Features and Detailed Description sections, this eliminates the need for external termination resistors - simplifying layout, reducing BOM cost, and improving signal fidelity on PCBs with moderate trace lengths. The value is optimized for typical FR-4 microstrip impedance and is effective at suppressing ringing observed in t_pd waveforms.

Can the SN74LVC2244APWG4 be used as a level translator between 1.8 V and 3.3 V domains?

Yes, the SN74LVC2244APWG4 functions as a unidirectional level translator from lower to higher voltage domains. With V_CC = 3.3 V, it reliably accepts 1.8 V logic inputs (VIH min = 0.65 × V_CC = 2.145 V is not required - inputs are 5.5 V tolerant and recognize 1.8 V as valid high), and outputs full 3.3 V swing. This behavior is documented in the Recommended Operating Conditions and Application Information sections, making the SN74LVC2244APWG4 suitable for bridging 1.8 V sensor interfaces to 3.3 V host processors.

What is the thermal resistance (RθJA) of the SN74LVC2244APWG4 in its TSSOP-20 package?

The SN74LVC2244APWG4 in TSSOP-20 (PW package) has a junction-to-ambient thermal resistance (RθJA) of 102.5°C/W, as specified in the Thermal Information table. This value assumes standard JEDEC 2-layer board conditions and informs thermal design margins - for example, at 50 mA total output current and 3.3 V supply, power dissipation remains below 50 mW, resulting in negligible temperature rise (<5°C) under typical ambient conditions. The SN74LVC2244APWG4 does not require heatsinking in standard industrial applications.