Texas Instruments SN74LV245ADGSR

Overview

SN74LV245ADGSR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage domains. It operates from 2 V to 5.5 V, delivers ≤6.5 ns propagation delay at 5 V, supports mixed-mode voltage translation (e.g., 5 V → 3.3 V), and features Ioff for partial-power-down isolation. It is used in LED display column drivers where level-shifting and bus contention control are critical.

For engineers reviewing the SN74LV245ADGSR datasheet, SN74LV245ADGSR pinout, SN74LV245ADGSR application, or SN74LV245ADGSR equivalent, key selection criteria include its 20-pin VSSOP (DGS) package, 3.3 V/5 V mixed-voltage I/O tolerance, 35 mA per-output drive capability, and guaranteed 125°C operation for industrial LED backplane interfaces.

Technical Context

The SN74LV245ADGSR implements a dual-bus directional transceiver architecture controlled by DIR and OE inputs. Its CMOS design enables true bidirectional data flow: when DIR = low, data passes from B bus to A bus; when DIR = high, data flows from A bus to B bus. OE independently disables all outputs into high-impedance state.

It integrates Ioff circuitry that actively disables outputs during power-down, preventing backflow current when VCC = 0 V. Input pins tolerate up to 5.5 V regardless of VCC, enabling robust down-translation from 5 V logic to 3.3 V systems without external level shifters.

Key Specifications

Pinout & Package

VSSOP-20 (DGS) package: 5.10 mm × 3.00 mm body, 0.5 mm pitch, exposed thermal pad, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A and 74AVCH245, the SN74LV245ADGSR uniquely combines 2–5.5 V operation, 125°C rating, Ioff, and 5.5 V-tolerant inputs - making it the sole option for ruggedized mixed-voltage industrial bus bridging where reliability trumps raw speed.

Availability

SN74LV245ADGSR is available at Aetrix Electronics and suitable for LED displays, industrial I/O expanders, and network switch control planes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LV245ADGSR 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 connectivity technologies with over 50 years of innovation in industrial and automotive electronics.

The SN74LV245A product line delivers robust, wide-supply-voltage bus transceivers optimized for mixed-signal industrial systems requiring interoperability between legacy 5 V and modern 3.3 V logic domains.

FAQ

What is the maximum operating temperature for SN74LV245ADGSR?

The SN74LV245ADGSR is specified for continuous operation from –40°C to +125°C. This rating is validated per JEDEC JESD22-A108 and applies to the full VCC range (2 V to 5.5 V). The DGS package's thermal resistance (RθJA = 118.4°C/W) supports this rating when mounted on a 2-layer PCB with adequate copper pour. SN74LV245ADGSR maintains all electrical specifications-including tpd ≤6.5 ns and Ioff ≤5 µA-across this full range.

Does SN74LV245ADGSR support 5 V to 3.3 V level translation?

Yes, SN74LV245ADGSR supports bidirectional 5 V to 3.3 V level translation. Its inputs tolerate up to 5.5 V regardless of VCC, allowing 5 V signals to be safely applied to A or B ports while VCC = 3.3 V. Outputs swing rail-to-rail (VOH ≥ VCC – 0.1 V, VOL ≤ 0.1 V), delivering clean 3.3 V logic levels. This eliminates external level shifters in mixed-voltage LED display and industrial I/O designs using SN74LV245ADGSR.

What is the function of the DIR and OE pins on SN74LV245ADGSR?

DIR (Pin 1) controls data direction: high enables A→B transfer, low enables B→A transfer. OE (Pin 19) is active-low and places both A and B ports into high-impedance state when asserted, electrically isolating the buses. These functions operate independently-OE can override DIR to force isolation, and DIR remains effective when OE is deasserted. This dual-control scheme enables flexible bus arbitration in systems using SN74LV245ADGSR as a programmable data bridge.

Is SN74LV245ADGSR pin-compatible with other 20-pin transceivers like SN74LVC245A?

SN74LV245ADGSR shares identical pinout and function mapping with SN74LVC245ADGSR and SN74LVTH245ADGSR in the VSSOP-20 (DGS) package. All three have DIR on Pin 1, A1–A8 on Pins 2–9, GND on Pin 10, B8–B1 on Pins 11–18, OE on Pin 19, and VCC on Pin 20. However, SN74LV245ADGSR differs electrically: it supports wider VCC (2–5.5 V vs. 1.65–3.6 V), includes Ioff, and has higher temperature rating-so direct substitution requires validation of these parameters in the target design.

What thermal considerations apply to SN74LV245ADGSR in high-density PCB layouts?

SN74LV245ADGSR in VSSOP-20 (DGS) has RθJA = 118.4°C/W on a 2-layer board. To maintain ≤125°C junction temperature at 5.5 V and full 8-channel switching, limit power dissipation to ≤125 mW. Use ≥1 cm² internal copper pour connected to Pin 10 (GND) and the exposed thermal pad (if present per DGS mechanical drawing). Place a 0.1 µF ceramic bypass capacitor within 3 mm of Pin 20 (VCC). Avoid routing high-speed traces under the SN74LV245ADGSR body to prevent coupling-induced jitter in adjacent signal paths.