Texas Instruments SN75462D

Overview

SN75462D from Texas Instruments is a dual high-voltage, high-current NAND peripheral driver IC designed for logic-level interfacing to power loads. It delivers 300 mA continuous output current per channel, supports up to 35 V off-state output voltage, and operates across 0°C to 70°C with TTL-compatible diode-clamped inputs. It is used in relay drivers, lamp drivers, and MOSFET gate drivers where robust output stage isolation and latch-up immunity are required.

For engineers reviewing the SN75462D datasheet, SN75462D pinout, SN75462D application, or SN75462D equivalent, this page provides verified technical context, package-validated pin functions, real-world use scenarios, and two confirmed alternative parts with documented functional and application differences.

Technical Context

The SN75462D implements two independent NAND-gated npn transistor output stages, with internal base resistors (1.6 kΩ, 4 kΩ) and emitter-follower output configuration. Each channel features diode-clamped TTL inputs and open-collector–like high-voltage outputs capable of sinking up to 300 mA while maintaining <0.5 V saturation voltage at that load.

It is characterized for 4.75 V to 5.25 V supply operation and exhibits medium-speed switching: typical propagation delays of 45 ns (tPLH) and 30 ns (tPHL), with transition times under 25 ns. No latch-up occurs at 30 V after conducting 300 mA - a key reliability feature distinguishing it from earlier SN7545x series drivers.

Key Specifications

Pinout & Package

SN75462D is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package (D package), 3.9 mm wide, 4.9 mm long, 1.75 mm max height, with 1.27 mm pitch. Pin 1 is located at the top-left corner marked by a beveled edge or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN75462P, the SN75462D offers superior thermal performance in surface-mount layouts and automated assembly compatibility; compared with ULN2003A, it integrates logic functionality and guarantees latch-up immunity - critical for robust industrial control interfaces.

Availability

SN75462D is available at Aetrix Electronics and suitable for industrial relay control, lamp/LED driver modules, MOSFET gate interface circuits, and legacy microprocessor bus buffering requiring stable component supply and long-term obsolescence management.

Supply support for SN75462D 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 SN75462D belongs to TI's legacy peripheral driver family, engineered specifically for robust 5 V logic-to-power interfacing in commercial-grade industrial control systems where latch-up immunity and high off-state voltage tolerance are mandatory.

FAQ

What is the maximum continuous output current per channel of the SN75462D?

The SN75462D is characterized for 300 mA continuous output current per channel under recommended operating conditions (VCC = 4.75 V to 5.25 V, TA = 0°C to 70°C). This rating assumes proper PCB thermal design and is validated with internal base resistors and thermal derating curves specified in the SLRS022A datasheet. Exceeding 300 mA continuously risks exceeding the 725 mW power dissipation limit in the SOIC (D) package.

Does the SN75462D require external base resistors when driving a transistor or relay coil?

No, the SN75462D does not require external base resistors. Its internal schematic includes integrated 1.6 kΩ and 4 kΩ base drive resistors per channel, optimized for direct connection to npn transistor bases or relay coils. Adding external resistors would reduce drive strength and is unnecessary unless modifying switching speed or current limits beyond datasheet specifications.

Can the SN75462D replace the SN75452 in an existing design?

The SN75462D is not a drop-in replacement for the SN75452. While both are dual peripheral drivers, the SN75452 is an inverting buffer (single-input), whereas the SN75462D is a dual 2-input NAND. Their logic functions, pinouts, and internal architectures differ. Substitution would require redesigning input logic and verifying timing margins - TI explicitly positions the SN7546x series as higher-breakdown alternatives to SN7545x, not functional equivalents.

What is the purpose of the diode-clamped inputs on the SN75462D?

The diode-clamped inputs on the SN75462D provide built-in protection against negative voltage transients and overvoltage spikes up to −1.5 V (VIK), allowing direct connection to standard TTL outputs without external clamping diodes or current-limiting resistors. This simplifies interface design and improves system reliability in electrically noisy industrial environments where ground bounce or ESD events may occur.

Is the SN75462D RoHS compliant and lead-free?

Yes, the SN75462D is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as confirmed in TI's official Package Option Addendum. It meets JEDEC Level-1 moisture sensitivity standards and is rated for peak reflow temperatures up to 260°C, making it compatible with standard lead-free PCB assembly processes.