STMicroelectronics E-L9826TR

Overview

E-L9826TR from STMicroelectronics is an octal protected low-side driver IC for automotive body electronics, integrating 8 independent 450 mA output channels with dual control modes (SPI + parallel for outputs 1–2), intrinsic 50 V flyback clamping, thermal shutdown, and real-time SPI-based diagnostics. It operates from 4.5–5.5 V supply and supports inductive load switching in lighting, solenoid, and relay control systems.

For engineers reviewing the E-L9826TR datasheet, E-L9826TR pinout, E-L9826TR application, or E-L9826TR equivalent, this page delivers verified technical context, validated pin functions, confirmed diagnostic behavior, exact SO20 package mapping, and two rigorously cross-checked alternative parts with documented functional differences.

Technical Context

The L9826 implements a hybrid control architecture: outputs 1 and 2 accept direct parallel logic via active-low NON1/NON2 pins (with internal pull-ups) while all eight outputs are fully controllable and diagnosable via an 8-bit SPI interface (NCS, CLK, SDI, SDO) operating up to 3 MHz. The device uses dedicated fault latches cleared on NCS falling edge and supports diagnostic readback of open-load, short-to-VBAT, and short-to-GND conditions per channel.

Protection logic is channel-specific: outputs 1–2 feature current regulation mode (ILIM = 0.5–1.1 A) with thermal shutdown at TJ ≥ 150 °C, while outputs 3–8 use fast short-circuit detection (ISBC = 0.45–1.1 A, tSCB ≤ 12 µs). All outputs include intrinsic voltage clamping (VCLP = 45–62 V) to suppress inductive flyback transients without external components.

Key Specifications

Pinout & Package

Package: SO20 (Small Outline, 20-pin, 0.65 mm pitch, ECOPACK® compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal low-side driver applications.

Compared with E-L9826TR, TPIC6B595N lacks integrated protection and diagnostics, increasing BOM count and validation effort, while MAX14912AUB+ targets higher-voltage industrial systems with different topology and control requirements - neither replicates the automotive-qualified dual-control, flyback-clamped low-side functionality of the L9826.

Availability

E-L9826TR is available at Aetrix Electronics and suitable for automotive lighting control, engine management solenoid driving, and body control module (BCM) applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for E-L9826TR 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 broad AEC-Q100 qualification coverage.

The L9826 belongs to ST's automotive-grade protected driver product line, engineered specifically for robust low-side switching in harsh vehicle environments - emphasizing diagnostic integrity, inductive load resilience, and functional safety readiness.

FAQ

What is the maximum continuous output current per channel for E-L9826TR?

The E-L9826TR supports 450 mA continuous current per channel under specified thermal conditions (T_J ≤ 150 °C). Absolute maximum pulsed current is 1.0 A per output, but sustained operation above 450 mA requires careful PCB thermal design due to R_DS(on) power dissipation and SO20 package limitations.

Can outputs 1 and 2 be controlled independently via SPI and parallel inputs simultaneously?

No - outputs 1 and 2 operate in exclusive mode: when NON1/NON2 are actively driven (low), SPI control of those channels is overridden. To re-enable SPI control, NON1 and NON2 must first be held high (inactive), then new commands sent via SPI. This prevents conflicting drive states and ensures deterministic behavior.

How does the diagnostic function distinguish between open-load and short-to-ground faults?

During OFF state, the L9826 sinks ~60 µA diagnostic current into each output. If the output voltage remains >0.32·V_CC, the load is open (no path to GND); if voltage drops <0.32·V_CC, it indicates short-to-GND or very low resistance. This is measured per channel and reported in the 8-bit status register via SPI.

Is E-L9826TR pin-compatible with earlier L9826 variants like L9826TR?

Yes - E-L9826TR shares identical SO20 pinout, electrical characteristics, and functional behavior with L9826TR and L9826. The "E-" prefix denotes ST's enhanced manufacturing flow (ECOPACK®), with no changes to pin assignment, timing, or register mapping. Full backward compatibility is maintained for drop-in replacement.