Texas Instruments SN75453BP

Overview

SN75453BP from Texas Instruments is a dual OR-gate peripheral driver IC designed for high-current, high-speed switching in TTL-based 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-compatible inputs - used in lamp, LED, and line driving applications where logic-level isolation and load current amplification are required.

For engineers reviewing the SN75453BP datasheet, SN75453BP pinout, SN75453BP application, or SN75453BP equivalent, key selection criteria include its OR logic function, 300 mA continuous output capability, 30 V off-state voltage rating, open-collector topology, and PDIP-8 package compatibility with legacy through-hole designs.

Technical Context

The SN75453BP implements two independent OR-gate logic drivers with internal npn transistor outputs, each configured as an open-collector stage. Its input structure uses diode clamping for robust TTL interfacing, and the output transistors are rated for latch-up immunity at 20 V after conducting 300 mA.

It operates within a 4.75 V–5.25 V supply range and exhibits propagation delays of 18–25 ns (low-to-high) and 18–25 ns (high-to-low) at 5 V/25°C with 200 mA load and 15 pF capacitance - enabling reliable use in timing-critical peripheral interface circuits.

Key Specifications

Pinout & Package

SN75453BP is housed in an 8-pin PDIP (Plastic Dual In-line Package) with nominal body size 9.81 mm × 6.35 mm, optimized for through-hole prototyping and legacy PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN75452BD and ULN2003A, SN75453BP uniquely integrates OR logic with 300 mA sinking capability in an 8-pin PDIP, offering minimal component count for dual-input-driven load control without external logic or layout rework.

Availability

SN75453BP is available at Aetrix Electronics and suitable for lamp drivers, LED drivers, line drivers, and memory drivers requiring stable component supply and long-term industrial availability.

Supply support for SN75453BP 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.

The SN7545xB family was designed specifically for TTL-system peripheral interfacing - delivering robust, latch-up-free high-current driving with integrated logic to simplify microcontroller I/O expansion in cost-sensitive industrial controls.

FAQ

What logic function does the SN75453BP implement?

The SN75453BP implements a dual OR-gate logic function: each channel outputs a low (sinking) state when either input A or B is high (TTL logic levels), and a high-impedance (off) state only when both inputs are low. This behavior is confirmed in Table 8-3 of the official datasheet and matches the positive-logic OR expression Y = A + B. The SN75453BP is distinct from other members of the SN7545xB family such as SN75451B (AND) or SN75452B (NAND).

Can SN75453BP drive a 24 V relay coil directly?

Yes, SN75453BP can drive a 24 V relay coil directly using its open-collector output configuration. Connect the relay coil between the 24 V supply and the 1Y or 2Y pin; the SN75453BP sinks current when enabled. With a typical coil resistance ≥80 Ω (≤300 mA), it operates safely within its 300 mA continuous rating and 30 V off-state voltage limit. Ensure the relay's flyback diode is installed across the coil to protect the SN75453BP from inductive kickback.

What is the maximum ambient temperature for continuous operation of SN75453BP?

The SN75453BP is characterized for continuous operation from 0°C to 70°C ambient temperature, as specified in the "Device Comparison Table" and "Recommended Operating Conditions" sections of the datasheet. This commercial-grade temperature range applies to all SN7545xB variants (e.g., SN75453BP, SN75453BD). Operation outside this range may result in parametric shift or reliability risk and is not guaranteed.

Does SN75453BP require external pull-up resistors on its outputs?

Yes, SN75453BP requires external pull-up resistors on pins 1Y and 2Y because it features open-collector outputs. These resistors connect between the output pin and the target load supply rail (e.g., 5 V, 12 V, or 24 V). The resistor value must be selected to limit current below 300 mA while ensuring valid logic-high voltage at the load - for example, a 100 Ω resistor with a 24 V supply yields 240 mA, staying within rating.

Is SN75453BP pin-compatible with SN75451BP or SN75452BP?

Yes, SN75453BP is pin-compatible with SN75451BP (AND) and SN75452BP (NAND) - all share identical PDIP-8 packaging, pin numbering, and terminal functions (1A, 1B, 1Y, GND, VCC, 2B, 2A, 2Y). However, logic functionality differs: substituting SN75453BP for SN75451BP changes the gate behavior from AND to OR, which may alter system logic unless upstream signals are adjusted accordingly.