Texas Instruments SN75452BPG4

Overview

SN75452BPG4 from Texas Instruments is a dual-channel NAND peripheral driver IC designed for high-current, high-speed switching in TTL-compatible logic systems. It delivers 300 mA per channel, supports up to 30 V 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 in industrial control interfaces.

For engineers reviewing the SN75452BPG4 datasheet, SN75452BPG4 pinout, SN75452BPG4 application, or SN75452BPG4 equivalent, key selection criteria include its NAND logic function, 300 mA sink capability per output, 30 V off-state voltage rating, and compatibility with 5 V TTL input levels and external pull-up configurations.

Technical Context

The SN75452BPG4 implements two independent NAND-gated npn transistor drivers, where both inputs must be high to activate the output transistor (pulling output low). Its internal base resistors and diode-clamped inputs eliminate external biasing components and ensure robust noise immunity in noisy industrial environments.

Each channel operates as an open-collector switch with no internal latch-up risk up to 20 V while conducting 300 mA, and exhibits propagation delays of 26–35 ns at 5 V supply and 25°C - enabling reliable interfacing between low-voltage microcontrollers and higher-voltage peripherals without level-shifting circuitry.

Key Specifications

Pinout & Package

SN75452BPG4 is supplied in an 8-pin PDIP (Plastic Dual In-line Package) with 9.81 mm × 6.35 mm body size and through-hole mounting. 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 NAND peripheral driver applications.

Compared with SN75452BD and SN75452BP, SN75452BPG4 provides identical NAND driver functionality and performance in a RoHS-compliant, green-lead-finish PDIP package - making it the preferred choice for new designs requiring regulatory compliance and through-hole assembly.

Availability

SN75452BPG4 is available at Aetrix Electronics and suitable for industrial control, test equipment, legacy system repair, and LED lighting applications requiring stable component supply and long-term obsolescence management.

Supply support for SN75452BPG4 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 specializing in analog, embedded processing, and logic solutions with over 50 years of leadership in industrial and automotive electronics.

The SN7545xB family was designed specifically to replace obsolete SN75450-series drivers in high-reliability TTL-based systems - emphasizing latch-up immunity, wide output voltage tolerance, and drop-in compatibility for maintenance and upgrade scenarios.

FAQ

What logic function does the SN75452BPG4 implement?

The SN75452BPG4 implements a dual NAND peripheral driver: each channel activates its open-collector output (pulls low) only when both inputs (A and B) are high. This matches positive-logic NAND behavior - Y = NOT(A AND B). The internal npn transistor structure ensures robust current sinking up to 300 mA per channel, and the diode-clamped inputs accept standard TTL voltage levels directly. SN75452BPG4 is not an inverter or buffer; its logic is fixed and non-configurable.

Can SN75452BPG4 drive a 24 V relay coil directly?

Yes, SN75452BPG4 can drive a 24 V relay coil directly via its open-collector output, provided the coil current remains ≤300 mA and an appropriate external pull-up resistor connects the output to +24 V. The device's 30 V off-state output voltage rating and no-latch-up guarantee at 20 V/300 mA make it suitable for this use case. Ensure the relay coil flyback diode is installed across the coil terminals, and verify that VCC remains within 4.75–5.25 V during operation. SN75452BPG4 does not regulate or limit output voltage - it only controls current conduction path.

What is the purpose of the diode-clamped inputs on SN75452BPG4?

The diode-clamped inputs on SN75452BPG4 provide built-in protection against negative voltage transients and simplify interface design by eliminating the need for external clamping diodes. Each input includes a series resistor and a diode to VCC and GND, ensuring input voltage stays within safe limits (–1.2 V to 5.5 V) even if driven by mismatched logic families or exposed to ESD. This feature maintains TTL compatibility while enhancing robustness in electrically noisy industrial environments. SN75452BPG4's input clamp voltage is specified at –1.5 V (typical), preventing damage during input overvoltage events.

Does SN75452BPG4 require external base resistors?

No, SN75452BPG4 does not require external base resistors. Its internal schematic (per TI SLRS021E Figure 8-10) integrates optimized base drive resistors - including 1 kΩ, 1.6 kΩ, and 4 kΩ values - to ensure proper saturation of the output npn transistors across the full operating temperature range. These resistors are laser-trimmed during manufacturing and matched to the transistor characteristics, enabling guaranteed 300 mA sink capability at VCC = 4.75 V and TA = 70°C. Adding external base resistors would degrade performance and is explicitly discouraged in the datasheet.

How does SN75452BPG4 differ from SN75451B?

SN75452BPG4 implements NAND logic (output active-low only when both inputs are high), whereas SN75451B implements AND logic (output active-low only when both inputs are high - same truth table but different internal gate topology). Both share identical packaging, ratings, and pinout, but their logic functions are distinct and not interchangeable without redesigning upstream logic. SN75452BPG4 is functionally equivalent to SN75452B variants; SN75451B is a separate part number with AND behavior. Using SN75452BPG4 in place of SN75451B will invert system logic behavior unless compensated in firmware or external gating.