Texas Instruments UC17133J

Overview

UC17133J from Texas Instruments is a high-side smart power switch IC designed for industrial and aerospace load control, delivering 300mA continuous output current with 72V inductive clamp protection, 8V–65V operating range, and integrated short-circuit/overload protection. It operates across –55°C to +125°C and uses an internal 6V reference to drive resistive or inductive loads directly from the high side (load connected to GND).

For engineers reviewing the UC17133J datasheet, UC17133J pinout, UC17133J application, or UC17133J equivalent, key selection criteria include its fixed 30% input comparator hysteresis, programmable CDEL-based turn-on delay and VCC interruption recovery, high-side–only configuration, and SOIC-8/J-package compatibility with legacy military-grade thermal and reliability requirements.

Technical Context

The UC17133J implements a composite PNP/NPN high-side output driver with integrated 72V zener clamp between HS and LS pins, enabling safe inductive load discharge without external diodes. Its fault logic uses a single CDEL capacitor to time both VCC power interruption recovery (t_D(OFF) ≈ 500 µs typical) and overcurrent response (t_SC = 75 µs, t_ROFF = 10 ms).

Input control is via a 3V threshold comparator (1/2 VREF) with fixed 30% hysteresis (0.9V), referenced to the internal 6V bandgap regulator (±0.2V over temperature). Current limiting is set by an external resistor from CSH to VCC, triggering at 150mV drop (e.g., 300mA with 0.5Ω), while short-circuit protection activates at 300mV (600mA with same resistor).

Key Specifications

Pinout & Package

UC17133J is housed in an 8-pin SOIC (D) package with J-grade military screening (–55°C to +125°C), conforming to MIL-PRF-38535 Class K requirements. Pin 1 is CDEL; pin 8 is IN. The package features gull-wing leads, 1.27mm pitch, and 5.3mm × 6.2mm body size.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side smart switch applications.

Compared with UC17133J, UC27133D and UC37133D share identical electrical behavior and pinout but differ critically in temperature rating and reliability screening-UC17133J is the only variant qualified for full military temperature range and J-grade construction, making it irreplaceable in aerospace and defense systems requiring guaranteed operation at –55°C.

Availability

UC17133J is available at Aetrix Electronics and suitable for aerospace actuator control, avionics power distribution, and military vehicle lighting control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UC17133J 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 aerospace markets.

The UC1713x family was engineered specifically for high-side load switching in harsh-environment applications demanding extended temperature operation, integrated fault protection, and minimal external component count.

FAQ

What is the maximum continuous output current specification for UC17133J?

The UC17133J supports 300mA continuous output current and 900mA peak current. This rating applies under specified thermal conditions with proper PCB copper area and ambient temperature ≤ +125°C. Derating is required above 25°C ambient per the thermal resistance curve in the datasheet. The 300mA value reflects sustained conduction through the internal high-side PNP/NPN composite transistor without exceeding junction temperature limits.

Does UC17133J support low-side switching configurations?

No, UC17133J is a high-side–only smart power switch. Its internal architecture and pinout (including dedicated CSH and HS pins, absence of CSL and LS pins) are optimized exclusively for high-side operation (load connected between VCC and HS). Low-side switching requires UC17131J or UC27131D. Attempting low-side use of UC17133J will result in incorrect current sensing and failure to activate the output driver.

How is overcurrent protection configured on UC17133J?

Overcurrent protection on UC17133J is configured using an external resistor (RCSH) connected between the CSH pin and VCC. The device triggers at a 150mV drop across RCSH, so a 0.5Ω resistor sets the threshold at 300mA (150mV ÷ 0.5Ω). Short-circuit protection activates at 300mV (600mA with same resistor). No programming pins or registers are involved - protection is purely analog and resistor-defined.

What is the purpose of the CDEL pin on UC17133J?

The CDEL pin on UC17133J serves a dual timing function: it programs both the output turn-on delay after power-up (t_D(ON)) and the VCC interruption recovery window. A capacitor (e.g., 10nF) connected from CDEL to GND sets t_D(ON) ≈ 11ms and allows VCC interruptions up to ~500µs without forcing a full restart. Internally, CDEL charges and discharges between 1.0V and 4.9V using precision current sources, enabling deterministic fault timing without microcontroller involvement.

Is UC17133J pin-compatible with UC27133D or UC37133D?

Yes, UC17133J is pin-compatible with UC27133D and UC37133D - all three share identical SOIC-8 pinout, pin functions, electrical characteristics, and block diagram. The sole differences are temperature rating (–55°C to +125°C vs. –40°C to +85°C vs. 0°C to +70°C) and screening level (MIL-PRF-38535 J-grade vs. commercial). PCB layout and schematic design can be reused across all three variants.