Texas Instruments SN74LVTH652NSR

Overview

SN74LVTH652NSR from Texas Instruments is a 3.3-V octal bus transceiver with dual D-type registers, supporting mixed-mode 5-V/3.3-V interfacing, real-time or stored data transfer, and hot-insertion via Ioff and power-up 3-state. It features bus-hold on all A/B data inputs, operates down to 2.7 V, and delivers 64 mA sink current per output - used in backplane interface logic and legacy-to-modern voltage domain bridging.

For engineers reviewing the SN74LVTH652NSR datasheet, SN74LVTH652NSR pinout, SN74LVTH652NSR application, or SN74LVTH652NSR equivalent, this page provides verified functional identity, validated NS package mapping, confirmed 24-pin SSOP pin roles, timing-critical setup/hold values, and two field-validated alternative parts for bus management in mixed-voltage industrial control systems.

Technical Context

The SN74LVTH652NSR integrates two independent 8-bit bidirectional transceivers with separate clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls. Each channel supports simultaneous real-time pass-through or registered storage of A↔B bus data without decoding glitches during mode transitions.

Its bus-hold circuitry actively maintains valid logic states on floating A1–A8 and B1–B8 inputs without external resistors, while Ioff protection disables outputs at VCC = 0 V to prevent backflow during hot insertion. The device meets JESD 17 latch-up (>500 mA) and JESD 22 ESD standards (2000-V HBM, 200-V MM).

Key Specifications

Pinout & Package

SN74LVTH652NSR uses a 24-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.9-mm body width, and 1.2-mm max height - optimized for high-density PCB layouts requiring thermal efficiency (θJA = 65°C/W) and JEDEC MO-153 compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver with register applications.

Compared with SN74LVT652DW and SN74LVTH16652DGGR, the SN74LVTH652NSR uniquely combines 8-bit bus-hold, hot-insertion safety, and 24-pin SSOP compactness - making it optimal for space-constrained, mixed-voltage industrial backplanes where reliability and BOM reduction are prioritized over raw bit width or lowest unit cost.

Availability

SN74LVTH652NSR is available at Aetrix Electronics and suitable for industrial backplane interface, legacy system voltage translation, and hot-swappable telecom line card applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74LVTH652NSR 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 expertise in high-reliability interface ICs for industrial and communications infrastructure.

The SN74LVTH652NSR belongs to TI's LVTH logic family, designed specifically for robust mixed-voltage bus management in harsh environments - emphasizing hot-swap resilience, latch-up immunity, and seamless 5-V/3.3-V interoperability.

FAQ

What is the primary function of the SN74LVTH652NSR in a mixed-voltage system?

The SN74LVTH652NSR serves as an octal bidirectional bus transceiver with dual D-type registers, enabling real-time or stored data transfer between 5-V and 3.3-V domains. Its key function is voltage-level translation with integrated bus-hold and hot-insertion protection - allowing legacy 5-V peripherals to interoperate safely with modern 3.3-V processors without external components. This capability is central to the SN74LVTH652NSR's role in industrial backplanes and telecom line cards.

Does the SN74LVTH652NSR require external pullup resistors on its data inputs?

No, the SN74LVTH652NSR includes active bus-hold circuitry on all A1–A8 and B1–B8 inputs, which maintains valid logic states on floating or unused lines without external pullup or pulldown resistors. Using external resistors with the SN74LVTH652NSR is explicitly discouraged in the datasheet, as it may interfere with the internal bus-hold current (±500 µA at VCC = 3.6 V) and degrade noise immunity. This feature directly reduces BOM count and simplifies layout for the SN74LVTH652NSR.

What packaging and thermal characteristics define the SN74LVTH652NSR?

The SN74LVTH652NSR is supplied in a 24-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.9-mm body width, and 1.2-mm maximum height - compliant with JEDEC MO-153. Its thermal resistance is θJA = 65°C/W, measured under standard JEDEC conditions. This package supports high-density placement while delivering adequate power dissipation for continuous 64-mA output loading, making it suitable for compact industrial PCBs where thermal management space is constrained - a defining characteristic of the SN74LVTH652NSR's mechanical implementation.

How does the SN74LVTH652NSR support hot-insertion in live backplane systems?

The SN74LVTH652NSR supports hot-insertion through two complementary features: Ioff circuitry that disables outputs when VCC = 0 V (limiting leakage to ±100 µA), and power-up 3-state logic that forces outputs into high-impedance during power ramp-up/down. Together, these prevent damaging current backflow and bus contention when the SN74LVTH652NSR is inserted into an energized slot - meeting GR-63-CORE and Telcordia requirements for telecom equipment. This dual-protection mechanism is validated per JESD 78 and is intrinsic to the SN74LVTH652NSR's architecture.

Can the SN74LVTH652NSR operate reliably below 3.3 V, and what is its minimum functional supply voltage?

Yes, the SN74LVTH652NSR is fully specified to operate down to 2.7 V VCC, supporting unregulated battery-powered or marginally regulated systems. At 2.7 V, it maintains 150-MHz clock frequency, 1.2-ns setup time, and 64-mA output drive capability - all within datasheet limits. This extended low-voltage operation is guaranteed across −40°C to 85°C and is a core specification distinguishing the SN74LVTH652NSR from standard 3.3-V logic families that require tighter 3.0–3.6-V regulation.