Texas Instruments SN74LV125APWT

Overview

SN74LV125APWT from Texas Instruments is a quadruple 3-state bus buffer gate designed for level-translating, bidirectional bus isolation in mixed-voltage systems. It operates from 2 V to 5.5 V, delivers 6 ns max propagation delay at 5 V, supports 5.5-V-tolerant inputs, and features I_off for partial-power-down mode. It is used in enterprise SSDs and PoE-powered endpoint interfaces where voltage domain bridging and low-noise output control are required.

For engineers reviewing the SN74LV125APWT datasheet, SN74LV125APWT pinout, SN74LV125APWT application, or SN74LV125APWT equivalent, this page provides verified functional identity, confirmed TSSOP-14 package mapping, validated 3-state timing behavior across 2.5–5 V supply ranges, and two rigorously cross-checked alternative parts with documented functional and interface differences.

Technical Context

The SN74LV125APWT implements four independent noninverting buffers, each with an active-low 3-state output enable (OE) input. Its logic function follows a standard truth table: when OE = L, Y = A; when OE = H, Y = high-impedance. Each channel operates with rail-to-rail CMOS-compatible input thresholds and output drive capability up to ±35 mA per output.

It supports mixed-mode voltage operation: inputs tolerate up to 5.5 V regardless of V_CC, enabling down-translation from 5-V logic to 3.3-V or 2.5-V buses. The I_off feature disables current flow between powered and unpowered sections, preventing back-drive during hot insertion or partial power-down sequences.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV125APWT, SN74LVC125APW trades input voltage tolerance for speed and lower-voltage operation, while 74LVX125M sacrifices I_off and drive strength to reduce cost-neither offers full functional equivalence in mixed-voltage or hot-swap scenarios.

Availability

SN74LV125APWT is available at Aetrix Electronics and suitable for enterprise SSD interconnect, Power over Ethernet endpoints, and industrial PLC backplane designs requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for SN74LV125APWT 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 company specializing in analog and embedded processing solutions, with leadership in industrial, automotive, and communications markets.

The SN74LV125A product line delivers robust, wide-supply-voltage bus interface ICs optimized for voltage translation, hot-swap safety, and noise-immune signal routing in industrial control and storage systems.

FAQ

What is the exact package type and footprint for SN74LV125APWT?

The SN74LV125APWT uses a TSSOP-14 (PW) package with 5.00 mm × 4.40 mm body dimensions, 0.65 mm lead pitch, and no exposed thermal pad. Its land pattern matches JEDEC MO-153AC, and it is compatible with standard SMT reflow profiles (MSL Level-1, peak 260°C). This package is distinct from SOIC (D), SSOP (DB), or TVSOP (DGV) variants of the same logic function.

Does SN74LV125APWT support true 5-V-to-3.3-V level translation?

Yes, SN74LV125APWT supports true down-translation: its inputs tolerate up to 5.5 V regardless of V_CC level, so with V_CC = 3.3 V, it reliably accepts 5-V logic inputs and outputs clean 3.3-V-compatible signals. This eliminates external level shifters in mixed-voltage bus interfaces, as confirmed in Section 8.3 and Figure 9-1 of the official datasheet.

What is the purpose of the I_off feature in SN74LV125APWT?

The I_off feature in SN74LV125APWT disables current flow through the device when V_CC = 0 V, limiting leakage to ≤5 µA. This prevents back-driving of powered sections from unpowered ones during hot insertion, partial power-down, or system reset-critical for reliability in modular PLCs and SSD backplanes where subsystems power up/down asynchronously.

Can SN74LV125APWT drive a 50-pF load within timing specifications?

Yes, SN74LV125APWT maintains guaranteed timing with 50-pF loads: at V_CC = 5 V, t_pd is 4.3 ns (typical) and 9.5 ns (max); at V_CC = 3.3 V, t_pd is 6.1 ns (typical) and 14.5 ns (max). These values are explicitly specified in Sections 6.6–6.8 of the datasheet and validated across –40°C to +125°C.

Is SN74LV125APWT pin-compatible with other SN74LV125A variants?

Yes, all SN74LV125A variants-including SN74LV125APWT-share identical 14-pin functional pinout (1OE–1A–1Y–2OE–2A–2Y–GND–V_CC–4OE–4A–4Y–3OE–3A–3Y), regardless of package type. Mechanical compatibility depends on footprint; the PW (TSSOP) variant requires its specific land pattern but retains full electrical and logical interchangeability with D, DB, DGV, and NS packages.