Texas Instruments SN75452BD

Overview

SN75452BD from Texas Instruments is a dual-peripheral NAND 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, and operates across 0°C to 70°C. Its open-collector outputs and diode-clamped TTL-compatible inputs enable direct interfacing with microcontrollers driving lamps, LEDs, or line loads.

For engineers reviewing the SN75452BD datasheet, SN75452BD pinout, SN75452BD application, or SN75452BD equivalent, key selection criteria include its NAND logic function, SOIC-8 package thermal performance (R_θJA = 122.2°C/W), latch-up immunity at 20V/300mA, and suitability for industrial buffer and peripheral driver designs requiring robust current sinking.

Technical Context

The SN75452BD implements two independent NAND-gated NPN transistor drivers with internally connected gate outputs to transistor bases. Each channel features TTL-compatible diode-clamped inputs and open-collector outputs capable of sinking up to 300mA continuously while maintaining <0.7V low-level output voltage at full load.

Its functional mode follows positive-logic NAND behavior: both inputs high → output active (low); any input low → output inactive (high-impedance). Designed for commercial temperature operation (0°C to 70°C), it replaces SN75450A with improved latch-up immunity and matches SN75450 speed without requiring external base resistors.

Key Specifications

Pinout & Package

SN75452BD uses an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with standard 1.27 mm pitch. Pin 1 is marked via notch or bevel; device orientation follows JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN75452BP and SN75452BDR, SN75452BD offers identical core functionality in a 75-unit tube format ideal for evaluation, small-batch builds, and engineering validation-balancing accessibility, thermal behavior, and procurement flexibility without compromising NAND logic integrity or 300mA drive capability.

Availability

SN75452BD is available at Aetrix Electronics and suitable for industrial control panels, LED signage systems, legacy memory subsystems, and embedded peripheral interface designs requiring stable component supply and long-term manufacturability.

Supply support for SN75452BD 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 logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.

SN75452BD belongs to TI's legacy dual-peripheral driver product line, engineered specifically for robust TTL-system interfacing where high-current sinking, latch-up immunity, and logic-level compatibility are critical in harsh or space-constrained environments.

FAQ

What logic function does the SN75452BD implement?

The SN75452BD implements a dual NAND gate driver: each channel activates its open-collector output (pulls low) only when both inputs are high. This positive-logic NAND behavior allows fail-safe control-any low input disables the output. The internal schematic integrates TTL-compatible diode-clamped inputs directly to NPN transistor bases, eliminating external base resistors. SN75452BD maintains this function across its full 0°C to 70°C operating range with guaranteed timing and current specs.

Can SN75452BD drive inductive loads like relays safely?

Yes, SN75452BD can drive relays and other inductive loads safely due to its verified latch-up immunity at 20V and 300mA, as confirmed in TI's characterization testing. However, a flyback diode must be placed across the relay coil (cathode to VSUP, anode to 1Y or 2Y) to suppress inductive kickback. This protects the NPN output transistors from voltage spikes exceeding 30V. SN75452BD's 30V off-state rating accommodates typical 24V relay coils with proper clamping.

What is the maximum continuous current per channel for SN75452BD?

The maximum continuous output current per channel for SN75452BD is 300mA, specified under recommended operating conditions (VCC = 4.75–5.25V, TA = 0°C to 70°C). This value is validated with R_BE ≤ 500Ω and assumes adequate PCB copper area for thermal dissipation. Exceeding 300mA risks exceeding the 725 mW SOIC-8 power rating, especially above 25°C ambient. For pulsed operation, peak current may reach 500mA (≤10 ms, ≤50% duty cycle), but average power must remain within continuous limits.

Does SN75452BD require external pull-up resistors on its outputs?

No, SN75452BD does not require external pull-up resistors on its outputs because it uses open-collector NPN transistors-outputs actively sink current but cannot source it. A pull-up resistor (or direct connection to VSUP) is mandatory on each 1Y and 2Y line to establish a defined high state when the transistor is off. The resistor value depends on load requirements and VSUP: for 24V operation with 1mA leakage tolerance, a 22kΩ resistor is typical. SN75452BD's 30V output rating supports pull-ups to any VSUP ≤30V.

How does SN75452BD differ from SN75451BD?

SN75452BD implements NAND logic (output low only when both inputs are high), whereas SN75451BD implements AND logic (output low only when both inputs are high in positive logic, matching SN75452BD's truth table but differing in internal gate structure). Both share identical packaging, current rating (300mA), voltage rating (30V), and thermal specs. The functional difference lies solely in logic polarity: SN75452BD is preferred when active-low enable is needed with inherent disable-on-any-low-input behavior, while SN75451BD suits active-high gating. SN75452BD and SN75451BD are pin-compatible and electrically interchangeable except for logic function.