Texas Instruments SN75452BDE4

Overview

SN75452BDE4 from Texas Instruments is a dual-NAND peripheral driver IC designed for high-current, high-speed switching in TTL-compatible systems. It delivers 300mA per channel, supports up to 30V output voltage, features open-collector outputs with diode-clamped TTL inputs, and operates across 0°C to 70°C - commonly used to drive LEDs, lamps, and relay coils from microcontrollers.

For engineers reviewing the SN75452BDE4 datasheet, SN75452BDE4 pinout, SN75452BDE4 application, or SN75452BDE4 equivalent, key selection criteria include its NAND logic function, 300mA continuous output current capability, SOIC-8 package thermal performance (RθJA = 122.2°C/W), latch-up immunity at 20V/300mA, and compatibility with 5V TTL input levels.

Technical Context

The SN75452BDE4 integrates two independent NAND-gated NPN transistor drivers with internal base resistors and diode-clamped inputs. Each channel implements positive-logic NAND functionality: output turns ON (low) only when both inputs are HIGH, enabling active-low load control.

Its open-collector outputs allow wired-OR configuration and direct interfacing with loads referenced to voltages up to 30V, while the 5V supply rail powers internal logic and bias networks - no external pull-ups required for logic-level operation, though external pull-ups are mandatory for output voltage translation.

Key Specifications

Pinout & Package

SN75452BDE4 uses an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with standard 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot; pins are numbered counter-clockwise from top-left.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-NAND peripheral driver applications.

Compared with SN75452BD, SN75452BDE4 offers identical performance with RoHS-compliant packaging; versus ULN2003A, it provides faster switching, integrated NAND logic, and lower saturation voltage - making it superior for time-critical dual-load control where logic gating is required on-chip.

Availability

SN75452BDE4 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, LED signage, and programmable logic interface applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for SN75452BDE4 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 90 years of innovation in industrial, automotive, and communications markets.

The SN7545xB family was engineered to replace legacy SN75450-series drivers with enhanced latch-up immunity and tighter parametric control - targeting cost-sensitive, high-reliability TTL-peripheral interfacing in commercial temperature environments.

FAQ

What logic function does the SN75452BDE4 implement?

The SN75452BDE4 implements a dual 2-input NAND gate with open-collector NPN transistor outputs. For each channel, the output (1Y or 2Y) pulls low only when both corresponding inputs (1A/1B or 2A/2B) are high. This positive-logic NAND behavior enables active-low load control and wired-OR configurations. The SN75452BDE4 does not provide inverted outputs or push-pull drive - external pull-up resistors are required on all outputs to establish high-state voltage levels.

Can the SN75452BDE4 drive a 24V relay coil directly?

Yes, the SN75452BDE4 can drive a 24V relay coil directly using its open-collector output stage. Its off-state output voltage rating is 30V, providing 6V margin above 24V operation. When activated, the device sinks up to 300mA per channel - sufficient for most 24V relays with coil resistances ≥80Ω. Ensure the relay's flyback diode is connected cathode-to-VS (not to VCC) to avoid exceeding the 30V output rating during turn-off transients.

What is the maximum operating temperature range for the SN75452BDE4?

The SN75452BDE4 is characterized for operation from 0°C to 70°C ambient temperature - the commercial-grade specification for the SN7545xB series. This differs from the military-grade SN5545xB variants (–55°C to 125°C). Thermal derating begins above 25°C ambient; at 70°C, its power dissipation is limited to 464 mW in SOIC-8 package due to RθJA = 122.2°C/W. Adequate PCB copper area and airflow are recommended for sustained 300mA operation near upper temperature limits.

Does the SN75452BDE4 require external base resistors?

No, the SN75452BDE4 does not require external base resistors. Internal base-emitter resistors are integrated into each NPN output transistor - specifically 1.6 kΩ and 4 kΩ networks as shown in the functional schematic (Figure 8-10). These values ensure proper saturation at 300mA output current with TTL-compatible input drive. Adding external base resistors would degrade switching speed and increase power dissipation unnecessarily - the device is designed for direct connection between TTL logic sources and the 1A/1B/2A/2B inputs.

How does the SN75452BDE4 prevent latch-up during high-current operation?

The SN75452BDE4 prevents latch-up through process-level design and layout techniques that eliminate parasitic SCR formation within the silicon. It is explicitly characterized to withstand 20V across the output while conducting 300mA continuously without entering latch-up - a key reliability enhancement over earlier SN75450-family devices. This behavior is verified per JEDEC JESD78 test conditions and does not rely on external circuitry. No additional protection components (e.g., current-limiting resistors or TVS diodes) are required solely for latch-up prevention under rated conditions.