Texas Instruments SNJ55461FK

Overview

SNJ55461FK from Texas Instruments is a military-grade dual AND peripheral driver IC designed for high-voltage, high-current switching in rugged embedded systems. It delivers 300 mA continuous output current per channel, supports 35 V off-state output voltage, operates across −55°C to 125°C, and features TTL-compatible diode-clamped inputs - enabling direct interface with logic controllers in relay, lamp, and MOSFET gate drive applications.

For engineers reviewing the SNJ55461FK datasheet, SNJ55461FK pinout, SNJ55461FK application, or SNJ55461FK equivalent, this device serves as a high-breakdown-voltage alternative to SN55451B-series drivers where latch-up immunity at 30 V under 300 mA load is required, and where medium-speed switching (tPHL ≤ 40 ns) and dual-channel logic buffering are critical.

Technical Context

The SNJ55461FK implements two independent AND-gate drivers with open-collector NPN output transistors whose bases are directly driven by internal logic gates. Each channel integrates input clamping diodes, base-emitter resistors (≤500 Ω), and emitter-follower output stages optimized for driving inductive loads up to 300 mA without latch-up.

It is characterized for full military temperature operation (−55°C to 125°C) and uses a ceramic leadless chip carrier (LCCC) package with 20 terminals, where 8 pins are no-connect (NC), and the remaining 12 serve power, inputs, outputs, and ground - supporting robust thermal performance (1375 mW at 25°C) and high-reliability hermetic sealing.

Key Specifications

Pinout & Package

Ceramic Leadless Chip Carrier (LCCC) package, 20-terminal, 8.89 mm × 8.89 mm body, 1.27 mm pitch, hermetically sealable, with 8 NC (no internal connection) terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SNJ55462FK and SNJ55463FK, the SNJ55461FK provides dedicated AND functionality without requiring external logic reconfiguration, making it optimal for safety-critical coincidence detection, dual-enable interlocks, and synchronized load activation where both inputs must be asserted.

Availability

SNJ55461FK is available at Aetrix Electronics and suitable for industrial automation, aerospace avionics, and defense electronics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SNJ55461FK 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 high-reliability components for industrial, automotive, and defense markets.

The SNJ55461FK belongs to TI's military-grade peripheral driver family, engineered specifically for high-voltage, high-current interface applications where latch-up immunity, wide temperature operation, and hermetic packaging are mandatory.

FAQ

What is the logic function implemented by the SNJ55461FK?

The SNJ55461FK implements two independent AND gates with open-collector NPN outputs. In positive logic, each output Y equals A AND B (Y = A·B). The internal schematic connects gate outputs directly to transistor bases, enabling direct drive of external loads tied to higher-voltage supplies via pull-up resistors or loads.

Does the SNJ55461FK require external pull-up resistors on its outputs?

Yes, the SNJ55461FK has open-collector NPN outputs (1Y and 2Y), so external pull-up resistors - or direct connection to a load referenced to a higher supply (e.g., 24 V) - are required to achieve active-high logic levels. The IC itself only provides the low-side switching path; no internal pull-ups exist.

Can the SNJ55461FK drive inductive loads like relays safely?

Yes, the SNJ55461FK is explicitly characterized for no latch-up at 30 V after conducting 300 mA, making it suitable for relay coils. However, an external flyback diode must be placed across the inductive load to clamp turn-off voltage spikes and prevent damage to the output transistors.

What is the maximum continuous output current per channel for the SNJ55461FK?

The SNJ55461FK is rated for 300 mA continuous collector current per channel under recommended operating conditions. This value assumes RBE ≤ 500 Ω and proper thermal management - the LCCC package supports 1375 mW dissipation at 25°C, derating linearly above that temperature.

Is the SNJ55461FK pin-compatible with other devices in the SN5546x family?

Yes, all SN5546x devices in the FK (LCCC-20) package share identical pinouts, including SNJ55461FK, SNJ55462FK, and SNJ55463FK. Only the logic function differs - AND, NAND, and OR respectively - allowing functional substitution with appropriate input signal adaptation.