STMicroelectronics L6377D013TR

Overview

L6377D013TR from STMicroelectronics is a high-side intelligent power switch in SO-14L package, designed for industrial load control with programmable current limitation (0.17–1.0 A), non-dissipative short-circuit protection, and integrated diagnostic output for overtemperature, undervoltage, and overcurrent events. It drives inductive, capacitive, or resistive loads in PLC I/O modules and CNC machine interfaces.

For engineers reviewing the L6377D013TR datasheet, L6377D013TR pinout, L6377D013TR application, or L6377D013TR equivalent, key selection criteria include adjustable current limit via RSC resistor, ON DELAY capacitor-programmable fault recovery timing, thermal shutdown at 150 °C with 20 °C hysteresis, and TTL/CMOS-compatible IN+/RESET inputs with built-in hysteresis.

Technical Context

The device integrates a high-side NDMOS power switch with internal voltage clamping (V_CL = 48–58 V), enabling safe demagnetization of inductive loads without external components under moderate energy conditions. Its diagnostic open-drain output (DIAG) reports three fault states-overtemperature, undervoltage, and overcurrent-via a single pin with active-low assertion.

Overcurrent protection operates in non-dissipative mode: during short-circuit, the MOSFET enters linear regulation to hold current at I_SC = 5/R_RSC (kΩ), sustained for t_ON = 1.28 μs/pF (set by CDON capacitor), followed by t_OFF = 64 × t_ON. Undervoltage lockout activates below V_STH − V_SHYS ≈ 7.5 V with 300–700 mV hysteresis.

Key Specifications

Pinout & Package

Package: SO-14L (14-pin small outline, ECOPACK-compliant, R_th(JA) = 150 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VNS1NV04PTR and IPS1032HTR, the L6377D013TR uniquely balances programmable current limiting, configurable short-circuit timing, and compact SO-14L packaging-making it optimal for mid-range industrial I/O where flexibility and fault intelligence are prioritized over raw current or footprint minimization.

Availability

L6377D013TR is available at Aetrix Electronics and suitable for programmable logic control, industrial PC peripheral I/O, and numerical control machines requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-4/5 surge immunity standards.

Supply support for L6377D013TR 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 ICs with strong European manufacturing and R&D infrastructure.

The L6377 belongs to ST's intelligent power switch product line, engineered specifically for robust, diagnostic-rich high-side load control in harsh industrial environments-emphasizing reliability, fault transparency, and ease of system-level safety certification.

FAQ

What is the maximum continuous output current supported by the L6377D013TR?

The L6377D013TR does not specify a fixed maximum continuous current; instead, it offers programmable current limitation from 0.17 A to 1.0 A via an external resistor on the RSC pin. At 25 °C ambient and proper PCB thermal design, sustained operation at 625 mA yields a typical V_DON of 250–350 mV, resulting in <160 mW conduction loss. Thermal derating applies above 85 °C ambient.

How does the ON DELAY capacitor affect short-circuit behavior?

The capacitor on the ON DELAY pin (Pin 10) sets the duration t_ON that the device remains in current-limited linear mode during a short-circuit event. Using Equation t_ON = 1.28 μs/pF, a 100 pF capacitor yields 128 ns, while 1 nF gives 1.28 μs. This delay prevents false DIAG assertions caused by inrush currents from capacitive or cold-filament loads before steady-state current stabilizes.

Can the L6377D013TR drive inductive loads without external components?

Yes-the L6377D013TR integrates an internal Zener clamp (V_CL = 48–58 V) that safely dissipates inductive flyback energy up to 50 mJ at T_J = 125 °C. For higher-energy inductive loads (e.g., large solenoids or motors), ST recommends adding an external Zener-diode clamp referenced to ground or VS, sized using V_Z < V_CL(min) − V_S(max) or V_S(max) < V_Z < V_CL(min).

Is the DIAG output compatible with 3.3 V microcontrollers?

Yes-the DIAG pin is an open-drain output rated for up to 40 V, allowing direct interfacing with 3.3 V or 5 V MCUs using a pull-up resistor to the MCU's I/O supply. With I_DIAG = 5 mA, the voltage drop is ≤1.5 V, ensuring reliable low-level recognition. No level-shifting circuitry is needed, simplifying design and reducing BOM count.