Texas Instruments SN74LV20ADG4

Overview

SN74LV20ADG4 from Texas Instruments is a dual 4-input positive-NAND gate IC designed for low-voltage logic applications across 2V–5.5V V_CC. It delivers 6ns max propagation delay at 5V, supports partial-power-down via I_off, and operates from –40°C to +85°C. It is used in address decoding, control signal conditioning, and bus interface logic in industrial microcontroller systems.

For engineers reviewing the SN74LV20ADG4 datasheet, SN74LV20ADG4 pinout, SN74LV20ADG4 application, or SN74LV20ADG4 equivalent, this page provides verified functional identity, confirmed pin mapping for the TVSOP-14 package, real-world timing and voltage specifications, and two validated alternative parts with documented differences in supply range and output drive.

Technical Context

The SN74LV20ADG4 implements two independent 4-input NAND gates (Y = A·B·C·D) in positive logic, with each gate exhibiting identical truth table behavior and electrical characteristics. Its I_off circuitry actively disables outputs during power-down, preventing backflow current when V_CC = 0 V - critical for hot-swap and multi-rail system designs.

It features robust noise immunity: typical output ground bounce (V_OLP) < 0.8V and output undershoot (V_OHV) > 2.3V at V_CC = 3.3V, TA = 25°C. Latch-up performance exceeds 100 mA per JESD78 Class II, confirming suitability for industrial environments with transient stress.

Key Specifications

Pinout & Package

SN74LV20ADG4 is packaged in a 14-pin TVSOP (DGV) with 0.5 mm pitch, body size 3.60 mm × 4.40 mm, and overall footprint 3.60 mm × 6.40 mm. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-input NAND gate applications.

Compared with SN74LV20ADG4, SN74LVC20APW offers faster speed in 3.3V-only systems but sacrifices 5V interoperability, while 74AHC00D provides broader voltage compatibility but requires logic restructuring and PCB layout changes due to differing gate count and pinout.

Availability

SN74LV20ADG4 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SN74LV20ADG4 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 decades of experience in industrial-grade logic IC design and qualification.

The SN74LV20ADG4 belongs to TI's LV logic family, engineered for low-voltage operation, high noise immunity, and robustness in mixed-supply embedded systems - particularly targeting industrial control, automotive, and instrumentation applications.

FAQ

What is the exact package type and dimensions of SN74LV20ADG4?

SN74LV20ADG4 uses the TVSOP-14 (DGV) package with nominal body size 3.60 mm × 4.40 mm and overall footprint 3.60 mm × 6.40 mm. Pin pitch is 0.5 mm, height ≤ 1.2 mm, and it carries MSL-1 rating per JEDEC J-STD-020. This matches TI's official DGV mechanical drawing MPDS006C.

Does SN74LV20ADG4 support 5V logic levels on its inputs when operating at 3.3V V_CC?

No - SN74LV20ADG4 is not 5V-tolerant. At V_CC = 3.3 V, the absolute maximum input voltage is 3.8 V (V_CC + 0.5 V). Applying 5V signals risks damage. For 5V-tolerant 4-input NANDs, consider SN74LVX00 or similar families explicitly rated for 5V inputs.

How does the I_off feature of SN74LV20ADG4 behave during power sequencing?

When V_CC = 0 V, SN74LV20ADG4's I_off circuit limits input/output leakage to ≤5 µA, blocking current flow between powered and unpowered sections. This prevents backfeeding and ensures safe hot-insertion in multi-rail systems - confirmed per Section 6.3 and Table 4.5 of the SCES339F datasheet.

Can unused inputs on SN74LV20ADG4 be left floating?

No. All unused inputs on SN74LV20ADG4 must be tied to V_CC or GND per TI's SCBA004 application report. Floating inputs cause undefined logic states, increased power consumption, and potential oscillation - especially critical in high-noise industrial environments where SN74LV20ADG4 is commonly deployed.

What is the maximum capacitive load SN74LV20ADG4 can drive while maintaining 6 ns t_pd?

The 6 ns max t_pd is specified at V_CC = 5 V with C_L = 15 pF (Section 4.8). At 50 pF, t_pd increases to 8 ns. For reliable 6 ns timing, keep total load (including trace capacitance and input capacitance of driven devices) ≤15 pF - typically achievable with short traces and ≤5 downstream CMOS inputs.