Texas Instruments SN75463D

Overview

SN75463D from Texas Instruments is a dual high-voltage, high-current OR gate peripheral driver IC designed for logic-level-to-power-level interfacing. It delivers up to 300 mA per channel, supports 35 V off-state output voltage, operates from 4.75 V to 5.25 V supply, and functions across 0°C to 70°C ambient temperature - used in relay drivers, lamp drivers, and MOSFET gate drivers where TTL-compatible inputs control inductive loads.

For engineers reviewing the SN75463D datasheet, SN75463D pinout, SN75463D application, or SN75463D equivalent, this page provides verified functional identity, confirmed SOIC-8 package mapping, validated OR logic behavior with open-collector–like npn output stage, exact switching timing (tPHL ≤ 40 ns), and real-world design meaning of VOL = 0.5 V @ 300 mA - critical for load interface margining and thermal derating.

Technical Context

The SN75463D implements two independent OR gates (positive logic: Y = A + B) with diode-clamped TTL-compatible inputs and npn transistor outputs whose emitters connect internally to GND and collectors serve as high-voltage, high-current outputs. Each output features built-in base drive resistors (1.6 kΩ, 4 kΩ) and emitter ballasting (130 Ω), enabling direct drive of relays, lamps, or MOSFET gates without external components.

It is characterized for 0°C to 70°C operation, uses a plastic SOIC-8 package with copper lead frame for improved thermal performance, and avoids latch-up at 30 V after conducting 300 mA - distinguishing it from earlier SN7545x series by higher breakdown voltage at slightly reduced speed.

Key Specifications

Pinout & Package

SN75463D is housed in an 8-pin plastic small-outline integrated circuit (SOIC) package (D package), 3.9 mm wide, 4.9 mm long, 1.75 mm max height, with gull-wing leads and NIPDAU surface finish. Thermal resistance θJA = 120°C/W (typical), power dissipation derated at 5.8 mW/°C above 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-voltage OR driver applications.

Compared with SN75463P and ULN2003A, the SN75463D uniquely combines dual OR logic, 300 mA sink capability, sub-40 ns switching, and SOIC-8 compactness - making it optimal for space-constrained, medium-speed industrial control where logic and drive are co-located.

Availability

SN75463D is available at Aetrix Electronics and suitable for industrial relay control, automotive lamp driving, memory address decoding, and MOSFET gate driving requiring stable component supply across extended production lifecycles.

Supply support for SN75463D 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 founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and communications markets.

The SN75463D belongs to TI's legacy peripheral driver family designed specifically for bridging TTL logic to high-voltage, high-current loads - emphasizing latch-up immunity, rugged output structure, and compatibility with legacy 5 V system architectures.

FAQ

What logic function does the SN75463D implement?

The SN75463D implements two independent OR gates (Y = A + B) in positive logic configuration. Each channel accepts two TTL-compatible inputs (1A/1B or 2A/2B) and drives a single npn transistor output (1Y or 2Y). The output is active-low sinking: Y goes low when either A or B is high. This behavior is confirmed in the FUNCTION TABLE on page 5 of the SLRS022A datasheet and applies exclusively to the SN75463D variant - not to SN75461 (AND) or SN75462 (NAND).

Can the SN75463D drive inductive loads like relays without external protection?

The SN75463D is not rated for direct inductive load switching without external flyback protection. Although it withstands 30 V latch-up after conducting 300 mA, its outputs lack integrated clamp diodes. For relay or solenoid use, a reverse-biased diode (e.g., 1N4004) must be placed across the coil with cathode to VCC and anode to the SN75463D output pin. This prevents voltage spikes exceeding 35 V from damaging the npn output transistors during turn-off.

What is the maximum continuous power dissipation for SN75463D at 70°C ambient?

At TA = 70°C, the SN75463D (SOIC-8 package) has a derated power dissipation of 464 mW, calculated from its 725 mW rating at 25°C and 5.8 mW/°C derating factor. This limit assumes proper PCB copper area (≥1 in²) and still-air conditions. Exceeding this value risks thermal shutdown or accelerated parametric drift. For 300 mA per channel at VOL = 0.5 V, total dissipation is 300 mW - within safe margin at 70°C if layout supports adequate heat spreading.

Is the SN75463D pin-compatible with SN75453B?

No, the SN75463D is not pin-compatible with SN75453B. While both are dual peripheral drivers in SOIC-8 packages, their pinouts differ: SN75463D uses Pin 1=1A, Pin 2=1B, Pin 3=1Y, Pin 4=GND, Pin 5=VCC, Pin 6=2B, Pin 7=2A, Pin 8=2Y. SN75453B uses Pin 1=1A, Pin 2=1Y, Pin 3=2A, Pin 4=2Y, Pin 5=GND, Pin 6=2B, Pin 7=1B, Pin 8=VCC. Swapping them would cause incorrect logic behavior and potential damage due to misrouted VCC/GND.

Does the SN75463D support 3.3 V logic inputs?

No, the SN75463D does not reliably accept 3.3 V logic inputs. Its input threshold is defined for TTL: VIH ≥ 2.0 V (min), VIL ≤ 0.8 V (max). While a 3.3 V signal exceeds VIH, the input clamp voltage (VIK = −1.2 V) and internal diode clamping are optimized for 5 V rail operation. Driving it from 3.3 V logic may result in marginal noise immunity or increased IIH leakage; level-shifting to 5 V is recommended for robust operation in mixed-voltage systems.