STMicroelectronics L295

Overview

L295 from STMicroelectronics is a dual switch-mode solenoid driver IC in Multiwatt15 package, designed for direct microprocessor-to-inductive-load interfacing. It delivers up to 2.5A peak current per channel, operates at up to 46V supply voltage, features adjustable regulated output current via analog reference inputs (Vref1/Vref2), and includes thermal shutdown, separate logic supply (VSS), and oscillator-controlled switching.

For engineers reviewing the L295 datasheet, L295 pinout, L295 application, or L295 equivalent, key selection considerations include its dual-channel independent control (EN, Vin1, Vin2), programmable peak current (0.2–2V reference range), 25–46 kHz oscillator frequency with external RC, thermal protection hysteresis (~130°C restart), and suitability for matrix printer hammer drivers and stepper motor phases.

Technical Context

The L295 implements two fully independent current-regulated H-bridge channels, each using an internal RS flip-flop, comparator, and bipolar output transistors (Q1/Q2) to enforce peak current limiting via external sensing resistors (RS1/RS2). Switching is controlled by an on-chip oscillator whose frequency (10–30 kHz) is set by external R-C network on pin 9.

Each channel accepts active-high digital inputs (Vin1/Vin2) and shares a common active-low enable (EN); current regulation is analog-set via Vref1/Vref2 (0.2–2 V), yielding peak current Ip = Vref / RS. Thermal shutdown activates at Tj = 150°C with ~20°C hysteresis, and logic supply (VSS) is isolated from power supply (VS) to support mixed-voltage systems.

Key Specifications

Pinout & Package

The L295 is housed in a 15-lead Multiwatt® package with integrated heat sink tab (pin 8), requiring mechanical mounting to PCB copper pour or external heatsink for thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel switch-mode solenoid driver applications.

Compared with STK682-010 and TB6612FNG, the L295 uniquely combines high-voltage (46V) capability, analog-programmable peak current, and thermally robust bipolar output stage - making it optimal for industrial solenoid and electromagnet applications demanding ruggedness and precision current control.

Availability

L295 is available at Aetrix Electronics and suitable for matrix printer hammer drivers, stepper motor phase controllers, and industrial solenoid valve systems requiring stable component supply and long-term industrial lifecycle support.

Supply support for L295 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 discrete solutions with vertical manufacturing and broad analog/mixed-signal IP.

The L295 belongs to ST's legacy power driver IC portfolio, engineered specifically for high-voltage, high-current inductive load control in industrial automation and electromechanical systems.

FAQ

What is the maximum continuous output current per channel for the L295?

The L295 supports 2 A DC continuous output current per channel under specified thermal conditions (Tcase ≤ 75°C). Its 2.5 A rating applies to repetitive pulsed operation (80% on, 20% off, Ton = 10 ms), not steady-state. Sustained 2.5 A requires aggressive heatsinking due to 25 W total dissipation limit and 3°C/W junction-to-case thermal resistance.

Can the L295 operate with a 3.3V logic supply?

No - the L295 requires a minimum VSS (logic supply) of 4.75 V, as specified in its absolute maximum ratings and electrical characteristics. Using 3.3V violates the guaranteed operating range and risks incorrect logic-level recognition, especially for the EN and Vin inputs which require ≥2.2 V for high-state detection. A level-shifter or 5V regulator is required for 3.3V microcontrollers.

How does the oscillator pin (pin 9) affect current regulation behavior?

Pin 9 connects to an external R-C network that sets the oscillator frequency (10–30 kHz), determining how often the current regulation loop resets. When pin 9 is grounded, the channel enters single-pulse mode (current rises then decays to zero). With R-C attached, it enables continuous chopper-mode regulation - turning Q1 on/off to maintain average current near the Vref-set peak value, reducing power loss and coil heating.

Is the L295 pin-compatible with newer ST solenoid drivers like the VNH2SP30?

No - the L295 uses a 15-pin Multiwatt package with unique pinout (e.g., separate Vref inputs, oscillator pin, dual supply rails), while the VNH2SP30 is a 28-pin PowerSSO package with integrated current sensing, SPI interface, and fault reporting. They differ in architecture, feature set, and physical layout; no direct pin-for-pin or functional replacement exists without PCB redesign and firmware adaptation.