Texas Instruments SN75454BPE4

Overview

SN75454BPE4 from Texas Instruments is a dual-peripheral NOR driver IC designed for high-current, high-speed switching in TTL-based systems. It delivers 300mA output current per channel, supports up to 30V off-state output voltage, operates from 4.75V to 5.25V supply, and functions across 0°C to 70°C. It drives lamps, LEDs, and line loads in industrial control interfaces.

For engineers reviewing the SN75454BPE4 datasheet, SN75454BPE4 pinout, SN75454BPE4 application, or SN75454BPE4 equivalent, this page provides verified functional mode tables, absolute maximum ratings, thermal metrics for PDIP-8, and confirmed NOR logic behavior with open-collector outputs and diode-clamped TTL-compatible inputs.

Technical Context

The SN75454BPE4 implements dual independent NOR gates whose outputs drive NPN transistor bases internally-no external base resistors required. Each channel features diode-clamped inputs for robust noise immunity and latch-up immunity up to 20V after conducting 300mA.

Its logic function follows positive-logic NOR: output Y = A + B (low when either input is high), enabling active-low load control. The device uses open-collector outputs, requiring external pull-up resistors to define high-level voltage and sink current into grounded loads.

Key Specifications

Pinout & Package

SN75454BPE4 is packaged in an 8-pin PDIP (Plastic Dual In-line Package) with nominal body size 9.81 mm × 6.35 mm and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard DIP convention (counterclockwise from top-left).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NOR driver applications.

Compared with SN75452BPE4, SN75454BPE4 provides native NOR behavior ideal for fail-safe low-active control; versus ULN2003APG, it integrates logic but offers fewer channels and lower voltage margin - trade-offs depend on whether logic integration or raw drive capability is prioritized.

Availability

SN75454BPE4 is available at Aetrix Electronics and suitable for industrial lamp control, LED indicator interfaces, relay coil driving, and legacy line driving requiring stable component supply and long-term obsolescence management.

Supply support for SN75454BPE4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The SN7545xB family was developed to replace legacy SN75450-series peripheral drivers with enhanced latch-up immunity and tighter parametric control for commercial-temperature industrial interfaces.

FAQ

What logic function does the SN75454BPE4 implement?

The SN75454BPE4 implements a dual NOR gate function per channel: output Y goes low only when both inputs A and B are low (positive-logic NOR). This behavior is confirmed in Table 8-4 of the official datasheet and matches the internal schematic shown in Figure 8-12. Each channel's output is open-collector, requiring an external pull-up resistor to define the high state.

Can SN75454BPE4 drive a 24-V lamp directly?

Yes, SN75454BPE4 can drive a 24-V lamp directly using its open-collector output configuration. With a 24-V pull-up on the 1Y or 2Y pin and the lamp connected between +24 V and the output, the SN75454BPE4 sinks up to 300 mA when activated. Its 30-V off-state output voltage rating ensures safe operation under 24-V conditions, and its latch-up immunity prevents failure during transients.

What is the recommended bypass capacitor for SN75454BPE4?

A 0.1-µF ceramic capacitor is recommended for bypassing the VCC pin of SN75454BPE4, placed as close as possible to the pin. This value is specified in Section 10 ("Power Supply Recommendations") of the datasheet to suppress high-frequency noise and stabilize the 5-V supply during fast switching transitions. Larger bulk capacitance (e.g., 10 µF) may be added nearby for low-frequency decoupling in noisy environments.

Does SN75454BPE4 require external base resistors?

No, SN75454BPE4 does not require external base resistors. Its internal schematic (Figure 8-12) shows integrated base-drive resistors (1 kΩ and 1.6 kΩ) connecting the NOR gate output to the NPN transistor base. This eliminates the need for discrete components and ensures proper saturation at 300 mA output current, as validated in the "Typical Characteristics" section (Figure 6-1).

How does SN75454BPE4 differ from SN75451BPE4?

SN75454BPE4 implements NOR logic (Y = A + B), whereas SN75451BPE4 implements AND logic (Y = A · B). Both share identical pinout, package (PDIP-8), supply range (4.75–5.25 V), output current (300 mA), and temperature range (0°C to 70°C). Their internal schematics differ only in gate topology - Figure 8-4 vs. Figure 8-5 - making them functionally interchangeable only when logic inversion is accounted for in firmware or external circuitry.