Texas Instruments 74LVC2G126DCUTG4

Overview

74LVC2G126DCUTG4 from Texas Instruments is a dual noninverting bus buffer gate with 3-state outputs, designed for 1.65 V to 3.6 V VCC operation. It features ±24 mA output drive at 3.3 V, 4 ns max propagation delay at 3.3 V, 5.5 V-tolerant inputs, and Ioff support for live insertion and partial-power-down mode. It serves as a level-translating buffer in high-speed digital interface paths such as LED driver control and wired-OR logic networks.

For engineers reviewing the 74LVC2G126DCUTG4 datasheet, 74LVC2G126DCUTG4 pinout, 74LVC2G126DCUTG4 application, or 74LVC2G126DCUTG4 equivalent, key selection criteria include 3-state output timing (tpd ≤ 4 ns), 5.5 V input tolerance enabling down-translation from 5 V to 3.3 V or 1.8 V domains, low ICC (≤10 µA), and VSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The 74LVC2G126DCUTG4 implements two independent noninverting buffers, each with dedicated output-enable (OE) control. Its Ioff circuitry isolates inputs and outputs when VCC = 0 V, preventing back-drive current and supporting hot-plug capability. The device operates across –40°C to +125°C and supports mixed-voltage system interfacing via 5.5 V-tolerant inputs independent of VCC level.

Each buffer exhibits rail-to-rail output swing (VOH ≥ VCC – 0.1 V, VOL ≤ 0.55 V at 24 mA), with switching characteristics specified over four VCC ranges (1.8 V, 2.5 V, 3.3 V, 5 V). Propagation delay (tpd) scales inversely with supply voltage - e.g., 4 ns max at 3.3 V and 3.2 ns max at 5 V - while enable/disable times (ten/tdis) remain under 5.1 ns across full temperature range.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.30 mm × 2.00 mm body, 0.5 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 3-state buffer applications.

Compared with SN74LVC2G126DCTRG4, the 74LVC2G126DCUTG4 saves >30% board area via VSSOP-8; versus 74LVC2G125DCUTG4, it provides direct signal pass-through without requiring complementary logic redesign - critical for timing-critical bus interfaces where added inversion would degrade setup/hold margins.

Availability

74LVC2G126DCUTG4 is available at Aetrix Electronics and suitable for high-speed digital interface design, motor control signal conditioning, and LED driver applications requiring stable component supply across automotive, industrial, and broadcast infrastructure programs.

Supply support for 74LVC2G126DCUTG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.

The SN74LVC2G126 product line delivers compact, high-drive 3-state logic buffers optimized for voltage translation, bus isolation, and signal integrity preservation in space-constrained, mixed-voltage systems.

FAQ

What is the maximum operating temperature range for the 74LVC2G126DCUTG4?

The 74LVC2G126DCUTG4 is rated for continuous operation from –40°C to +125°C. This extended temperature range is validated per JEDEC JESD22-A108 and supports deployment in under-hood automotive modules, industrial motor drives, and outdoor broadcast equipment where ambient thermal stress exceeds commercial-grade limits. All electrical specifications, including tpd and output drive, are guaranteed across this full range.

Does the 74LVC2G126DCUTG4 support level translation between 5 V and 3.3 V logic domains?

Yes, the 74LVC2G126DCUTG4 supports down-translation from 5 V to 3.3 V logic domains. Its inputs tolerate up to 5.5 V regardless of VCC setting, allowing 5 V signals to be safely applied while VCC is at 3.3 V, 2.5 V, or 1.8 V. The output swing remains rail-to-rail (VOH ≈ VCC, VOL ≈ 0 V), so the translated output conforms to the lower VCC domain's logic thresholds - confirmed in TI's SCES205N datasheet Section 8.3.

What is the purpose of the Ioff feature in the 74LVC2G126DCUTG4?

The Ioff feature in the 74LVC2G126DCUTG4 disables all input and output circuitry when VCC = 0 V, limiting leakage current to ±10 µA. This prevents back-driving of powered sections of the system during hot-insertion or partial-power-down events - essential for backplane architectures and modular systems where boards may be inserted or removed while other slots remain active. The feature is intrinsic to the silicon design and requires no external components.

Can the 74LVC2G126DCUTG4 drive LEDs directly?

Yes, the 74LVC2G126DCUTG4 can drive LEDs directly. At VCC = 3.3 V, it delivers ±24 mA per output - sufficient for standard indicator LEDs (typically 5–20 mA) and small LED arrays. Its VOL ≤ 0.55 V at 24 mA ensures minimal voltage drop, maximizing forward voltage available to the LED. For higher-current or high-brightness LEDs, verify thermal dissipation using RθJA = 227°C/W and derate per TI's thermal guidelines in Section 6.4.

Is the 74LVC2G126DCUTG4 pin-compatible with other members of the SN74LVC2Gxx family?

The 74LVC2G126DCUTG4 shares the same VSSOP-8 (DCU) pinout with SN74LVC2G125DCUTG4 (inverting buffer) and SN74LVC2G34DCUTG4 (noninverting buffer without 3-state), but not with variants like SN74LVC2G08 (AND gate) or SN74LVC2G74 (flip-flop). Pin compatibility is limited to functionally similar dual-buffer devices within the same package type; always verify pin functions against TI's SCES205N Figure 5-1 before substitution.