STMicroelectronics L6374FP013TR

Overview

L6374FP013TR from STMicroelectronics is a quad-channel industrial line driver IC designed for 24 VDC digital output modules in PLCs and motor controllers. It delivers four independent push-pull outputs (100 mA continuous), operates from 10.8 V to 35 V, supports input signals from –7 V to +35 V, and integrates overcurrent, overtemperature, and undervoltage protections with open-drain diagnostic output.

For engineers reviewing the L6374FP013TR datasheet, L6374FP013TR pinout, L6374FP013TR application, or L6374FP013TR equivalent, this device serves as a robust, protected high-voltage interface for IEC 61131-compliant industrial control systems requiring reliable 24 V signal-level switching, fast rise/fall times (<300 ns), and programmable fault delay.

Technical Context

The L6374FP013TR implements four independent high-side/low-side push-pull output stages with true three-state control and zero-current isolation between Vs and GND. Each channel features a high-impedance comparator input (–7 V to +35 V range) referenced to an internal 1.25 V bandgap or external voltage on Pin 11 (REF), with 200 mV hysteresis for noise immunity.

It integrates a charge pump (Pins 19/20) enabling full rail-to-rail output swing up to 35 V, while enforcing current limiting (110–300 mA typ.) across the entire output voltage range (0–Vs). Diagnostic logic combines overcurrent, undervoltage, and overtemperature events into a single open-drain Diag pin (Pin 14), with programmable delay via external capacitor on Pin 13 (C3).

Key Specifications

Pinout & Package

Package: SO-20 (ECOPACK® compliant, 12.6 mm × 7.6 mm body, 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel industrial line driver applications.

Compared with TBD72004A and ULN2803ADW, the L6374FP013TR uniquely integrates bidirectional push-pull outputs, –7 V to +35 V input tolerance, real-time diagnostics, and programmable fault delay-making it the only option qualified for high-reliability, standards-compliant 24 V industrial digital output modules.

Availability

L6374FP013TR is available at Aetrix Electronics and suitable for programmable logic controllers, high-density digital output modules, and motor controllers requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.

Supply support for L6374FP013TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with broad manufacturing and quality certifications.

The L6374FP013TR belongs to ST's industrial line driver product line, engineered specifically for IEC 61131-2-compliant 24 VDC control systems requiring high integration, protection, and diagnostic capability in compact SO-20 packaging.

FAQ

What is the purpose of the C3 pin (Pin 13) on the L6374FP013TR?

Pin 13 (C3) accepts an external capacitor to program the delay between overcurrent detection and activation of the Diag output. The delay scales at ≈10 pF per microsecond-e.g., a 100 pF capacitor adds ~10 μs delay. This prevents false diagnostics during inrush currents from capacitive loads or cold filament lamps, as confirmed in Section 9 of DS0188 Rev 4.

Can the L6374FP013TR drive inductive loads directly?

Yes-the L6374FP013TR safely drives inductive loads such as solenoids and relay coils. Its outputs include internal clamping diodes to Vs and GND, and its current-limiting circuit remains effective across the full 0–Vs output voltage range. However, external flyback diodes are still recommended for high-energy inductors to reduce stress on internal clamps, per Section 12 of the datasheet.

How does the REF pin (Pin 11) affect input threshold behavior?

When Pin 11 (REF) is left floating, the L6374FP013TR applies an internal 1.25 V bandgap reference to all four input comparators. If externally biased (0–5 V), it sets the input threshold: high threshold = V_REF + 100 mV, low threshold = V_REF – 100 mV (due to 200 mV hysteresis), as defined in Table 3 and Section 10 of DS0188 Rev 4.

Is the L6374FP013TR compatible with 3.3 V or 5 V logic inputs?

No-the L6374FP013TR does not accept 3.3 V or 5 V logic-level inputs directly on its I1–I4 pins. Its analog inputs require signals referenced to the REF pin and operate over –7 V to +35 V. For microcontroller interfacing, a level-shifting circuit or optocoupler is required to translate 3.3 V/5 V logic into the –7 V to +35 V compliant range, as specified in Section 10 and Table 3.