STMicroelectronics L484D1013TR

Overview

L484D1013TR from STMicroelectronics is a magnetic pickup ignition controller IC designed for breakerless automotive ignition systems. It directly drives an external NPN Darlington transistor, provides dwell angle control, coil current peak limitation (200–320 mV sensing threshold), and tachometer signal output (open-collector, 10 mA sink). It operates across 6–28 V supply and supports load dump (100 V) and reverse battery (–14 V) protection.

For engineers reviewing the L484D1013TR datasheet, L484D1013TR pinout, L484D1013TR application, or L484D1013TR equivalent, key selection considerations include dwell timing adaptability via external RC networks (pins 3, 6, 7, 8), magnetic pickup waveform flexibility (dual-input zero-crossing + dwell detection), and integrated coil current protection with permanent conduction timer disable (pin 4).

Technical Context

The L484D1013TR implements dual-input magnetic pickup interface logic: pin 8 serves as zero-crossing detector for ignition actuation, while pin 2 measures pickup amplitude to dynamically set dwell time. A third input (pin 6) enables dwell ratio adjustment at high RPM by modifying desaturation timing via external resistor Ra.

Dwell control uses a feedback loop comparing active-region conduction time against a reference period, adjusting spark timing to maintain ~10% desaturation time across speed ranges. Current limiting employs a comparator monitoring voltage across RSENS (pin 1), clamping coil current when VSENS reaches 200–320 mV, with continuous protection enforced even during anti-knock "power-on" override (pin 9).

Key Specifications

Pinout & Package

DIP16 package: 0.3-inch wide dual in-line package with 2.54 mm pitch, 20.0 × 8.5 mm body, 3.3 mm max height, and 1.27 mm lead length. RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar magnetic pickup ignition controller applications.

Compared with MC3378A and UC3837N, the L484D1013TR delivers unique dual-input dwell control, built-in 100 V load dump handling, and seamless anti-knock override-reducing system BOM count by ≥4 discrete protection components and enabling direct drop-in use with legacy magnetic sensors.

Availability

L484D1013TR is available at Aetrix Electronics and suitable for gasoline engine ignition control, aftermarket ignition modules, anti-knock spark delay systems, and industrial gas engine controls requiring stable component supply across extended temperature and voltage ranges.

Supply support for L484D1013TR 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 manufacturing and quality certifications.

The L484 belongs to ST's automotive ignition controller product line, engineered specifically for breakerless magnetic pickup-based ignition systems requiring high-voltage transient resilience, adaptive dwell timing, and fail-safe coil current protection.

FAQ

What is the function of Pin 9 ("POWER-ON INPUT") in anti-knock operation?

Pin 9 forces the external Darlington into conduction independently of dwell timing logic, enabling precise spark delay when asserted low by an external knock-detection MCU. Crucially, all protections-including coil current limiting, permanent conduction timer, and load dump response-remain fully active during this override mode, ensuring system safety is never compromised.

How does the L484D1013TR adapt to different magnetic pickup signal amplitudes?

The L484D1013TR uses two dedicated inputs: pin 8 detects zero-crossing for ignition timing, while pin 2 senses peak negative amplitude to determine dwell duration. By adjusting external resistors R11 (on pin 2) and Ra (between pins 6 and 11), designers scale dwell response across weak (e.g., low-RPM) and strong (e.g., high-RPM) pickup waveforms without firmware changes.

What external components are mandatory for basic L484D1013TR operation?

Mandatory components include: current sense resistor RSENS (pin 1), dwell timing capacitor C1 (pin 3), dwell control capacitor C2 (pin 7), tach pull-up resistor (pin 5), supply zener current-limiting resistor R9 (pin 11), and dump protection divider R8/R9 (pin 12). The application circuit in ST's datasheet Figure 2 specifies exact values and placement for ISO 7637-1 compliance.

Is the L484D1013TR still in active production or subject to obsolescence?

The L484D1013TR is marked "Obsolete Product(s)" in ST's official documentation, but Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for design-in continuity. For new designs, ST recommends evaluating the L9369-TR as a functional successor with enhanced diagnostics and CAN interface-though it requires PCB redesign and firmware adaptation.