Texas Instruments SN75453BDR

Overview

SN75453BDR from Texas Instruments is a dual OR-gate peripheral driver IC designed for high-current, high-speed switching in TTL-compatible systems. It delivers 300 mA per channel, supports up to 30 V output voltage, operates from 0°C to 70°C, and features open-collector outputs with diode-clamped TTL inputs - used in LED drivers, lamp drivers, and line drivers.

For engineers reviewing the SN75453BDR datasheet, SN75453BDR pinout, SN75453BDR application, or SN75453BDR equivalent, key selection criteria include its OR logic function, 300 mA continuous output current capability, SOIC-8 package thermal performance (RθJA = 122.2°C/W), and compatibility with 5 V TTL-level control signals.

Technical Context

The SN75453BDR implements dual independent OR logic gates whose outputs drive NPN open-collector transistors capable of sinking up to 300 mA each. Its internal resistor network ensures defined logic thresholds and latch-up immunity at 20 V after conducting rated current.

Each channel responds to positive-logic OR behavior: output turns ON (low) when either input A or B is high. Propagation delay is 18–25 ns at 5 V/25°C, and low-level output voltage remains ≤0.4 V at 300 mA load - enabling direct interface with inductive or resistive loads without external pull-ups.

Key Specifications

Pinout & Package

SN75453BDR uses an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with standard 1.27 mm pitch. Pin functions are validated per TI SLRS021E datasheet Figure 5-1 and Table 5-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual OR-gate driver applications.

Compared with SN75451BDR and SN75452BDR, the SN75453BDR provides native OR functionality without requiring external logic inversion - reducing component count and propagation delay in systems where OR-based enable or alarm-ORing is required.

Availability

SN75453BDR is available at Aetrix Electronics and suitable for lamp drivers, LED drivers, and line drivers requiring stable component supply across industrial control, test equipment, and embedded HMI designs.

Supply support for SN75453BDR 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 and embedded processing technologies with over 50 years of innovation in logic, power, and interface solutions.

The SN7545xB family was designed specifically for TTL-system peripheral interfacing - delivering robust, latch-up-free high-current driving in compact SOIC and PDIP packages for industrial and commercial applications.

FAQ

What logic function does the SN75453BDR implement?

The SN75453BDR implements a dual OR gate function: each channel's output goes low (active) when either input A or B is high. This is confirmed in the device function table (Table 8-3) and logic diagram (Figure 8-7) of the TI SLRS021E datasheet. The SN75453BDR's OR behavior is intrinsic to its internal transistor-resistor structure and does not require external components to realize.

Can the SN75453BDR drive a 24 V relay coil directly?

Yes, the SN75453BDR can drive a 24 V relay coil directly: its output voltage rating is up to 30 V, and it sustains 300 mA continuous current per channel. When used with a flyback diode across the coil, the SN75453BDR provides complete solid-state switching without external transistors - verified in TI's typical application circuit (Figure 9-1) and absolute maximum ratings (Section 6.1).

What is the maximum operating temperature for the SN75453BDR?

The SN75453BDR is characterized for operation from 0°C to 70°C, as specified in the device comparison table (Section 4) and recommended operating conditions (Section 6.2). This commercial temperature range applies to all SN7545xB variants, distinguishing them from the military-grade SN5545xB series rated from –55°C to 125°C.

Does the SN75453BDR require external pull-up resistors on its outputs?

Yes, the SN75453BDR has open-collector outputs and requires external pull-up resistors to establish a defined high state. The value depends on load and speed requirements - TI recommends starting with 1–10 kΩ for general-purpose use. This is explicitly stated in the "Description" section and reinforced by the schematic diagrams (Figures 8-9 through 8-12) showing external pull-up paths.

How does the SN75453BDR prevent latch-up during high-current operation?

The SN75453BDR is characterized for no latch-up at 20 V after conducting 300 mA, as stated in its Features list and Absolute Maximum Ratings (Section 6.1). This immunity results from proprietary process design and internal layout techniques - not external circuitry - enabling reliable operation under transient overload conditions without protection components.