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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

STMicroelectronics L482D1

Name: L482D1
Brand: STMicroelectronics
SKU: L482D1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L482D1

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: L482D1.pdf

Description:: IC CTRLR HALL EFFECT IGN SOIC-16

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L482D1 from STMicroelectronics is a Hall-effect ignition controller IC designed to directly drive external NPN power Darlington transistors in breakerless automotive ignition systems. It provides coil current dwell angle control, peak current limitation (400 mV sensing threshold), desaturation time monitoring (0.6–1.57 ms), and permanent conduction protection with 1 s delay (C1 = 1 µF). It operates across 6–28 V supply and supports engine speeds up to 6000 RPM (200 Hz) in 4-cylinder applications.

For engineers reviewing the L482D1 datasheet, L482D1 pinout, L482D1 application, or L482D1 equivalent, key selection considerations include its SO16 package-specific pin mapping (no pin 9 reset output), integrated load dump protection (100 V), Darlington overvoltage clamping via external R5/R6 divider, and dual capacitor-based dwell timing (C2/C5 = 100 nF).

Technical Context

The L482D1 implements analog dwell control by comparing voltages across two externally timed capacitors (C2 and C5), where C2 discharges on Hall-signal falling edge and charges at 13.3× rate upon current limiting. Its feedback loop maintains constant desaturation time (td) - not fixed dwell - to stabilize spark energy during acceleration.

It integrates multiple protection functions: load dump shutdown (pin 10 in SO16), reverse-battery resilience via pin-5/10/11/14/15 impedance, permanent conduction cutoff after 1 s high-Hall input, and Darlington collector voltage clamping using internal zener + external R5/R6 divider referenced to pin 15.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	6–28 V - accommodates automotive battery transients including cranking dips and alternator surges.
Current Sensing Threshold	200–400 mV - sets precise coil peak current limit via external sense resistor RS and R1/R2 divider.
Desaturation Time (td)	0.6–1.57 ms - defines active-region duration for power dissipation control and spark energy stability.
Dwell Timing Capacitors	C2 = C5 = 100 nF - ensures speed-compensated dwell angle with recommended 100 kΩ reference resistor at pin 7.
Load Dump Withstand	100 V / ≤300 ms decay - internal circuit disables Darlington and shorts supply during ISO 7637-2 pulse 5a events.
Permanent Conduction Delay	1–5 s (typ. 1 s) - set by C1 = 1 µF at pin 8; prevents coil burnout when engine is stopped but Hall signal remains high.
Junction Temp Range	–55 to +150 °C - qualified for under-hood automotive environments with SO16 thermal resistance Rth j-al = 50 °C/W.

Pinout & Package

The L482D1 is housed in a 16-pin SOIC narrow-body package (SO16), measuring 9.8–10 mm × 5.8–6.2 mm × 1.75 mm, with 1.27 mm pitch, gull-wing leads, and 0.20 g mass. Unlike the DIP16 version, SO16 reassigns pins: pin 9 is repurposed as current sensing input (replacing DIP's permanent conduction reset), pin 10 becomes dump protection input, pin 11 serves as power supply, and pin 12 is signal ground.

Pin/Terminal	Circuit Role	Design Meaning
1	Conduction Time Signal	Open-collector TTL-compatible output low during Darlington ON-state (coil current flow); used for ECU timing sync.
2	Hall-Effect Input	Active-high enable for coil charging; accepts open-collector Hall sensor output (70% duty cycle typical).
3	Dwell Control	Input for C2 capacitor; voltage compared against C5 to determine dwell start point based on engine speed.
4	Dwell Control Timer	Input for C5 capacitor; charged on Hall high, discharged on Hall low transition to generate speed-dependent reference.
5	Hall Sensor Supply	Zener-regulated 19–25 V output for powering Hall sensor; protected by series resistor Ra against transients.
6	Desaturation Time Signal	Open-collector output high during Darlington desaturation (current limiting); used for td measurement and diagnostics.
7	Reference Voltage	2.5–3.5 V source; sets bias current for C2/C5 timing and C1 permanent conduction timer via R11 = 100 kΩ.
8	Permanent Conduct. Timer	Connects to C1 (1 µF typical); initiates coil current ramp-down if Hall input stays high >1 s (cranking safety).
9	Current Sensing Input	Replaces DIP pin 9; receives divided voltage from Rs–R1–R2 network to set I_peak = (V_SENS/R_S)·(R₁/R₂ + 1).
10	Dump Protection	SO16-specific input for load dump detection; connects to external R8/R9 divider to set 100 V clamp threshold.
11	Power Supply	Primary 6–28 V input; includes internal 7 V zener (pin 12 in DIP); external R7 limits zener current at high VS.
12	Signal Ground	System reference for all analog comparators, timers, and sensing circuits; must be low-impedance connection.
13	Ground	Power ground return path for Darlington driver stage; separate from signal ground in layout best practice.
14	Driver Collector	Internal driver collector node; supplies base current to external Darlington via R10 (value depends on Darlington h_FE).
15	Overvoltage Limitation	Connects to R5/R6 divider; sets Darlington collector clamp voltage V_ovp ≈ 30·(R5+R6)/R6 + 30 mV.
16	Driving Stage Output	Base-drive output for external Darlington; requires C3 (1–100 nF) and R3 (2 kΩ typical) for stability and gain control.

Key Features

Feature	Design Value
Speed-Compensated Dwell Control	Uses dual capacitor timing (C2/C5) to maintain constant desaturation time across 30–6000 RPM, ensuring stable spark energy during acceleration.
Integrated Load Dump Protection	Shuts off Darlington and shorts supply at ≤300 ms decay for 100 V transients - eliminates need for external TVS on battery line.
Programmable Permanent Conduction Timeout	1 s default delay (C1 = 1 µF) prevents coil overheating when engine stalls but ignition key remains on.
External Darlington Overvoltage Clamp	Configurable collector voltage limit via R5/R6 divider at pin 15 - protects Darlington from inductive kickback without snubber diodes.
Hall Sensor Power Regulation	On-chip 19–25 V zener at pin 5 powers Hall sensor reliably while rejecting battery noise and load dump coupling.

Applications

Engine Control Unit (ECU) Ignition Module

High-Energy Ignition Coil Driver

Use Scenario: Microprocessor-based ECU in gasoline-powered passenger vehicles controls spark timing using Hall-effect crankshaft position sensor signals.

IC Role / Device Role / Timing Role: L482D1 acts as the final-stage ignition controller, translating ECU timing commands into precise coil dwell and current-limiting actions.

Use Value: Enables consistent spark energy across 30–6000 RPM range and survives ISO 7637-2 load dump pulses without external protection components.

Use Scenario: Aftermarket high-performance ignition system replaces mechanical points with solid-state switching for improved reliability and spark intensity.

IC Role / Device Role / Timing Role: Provides direct Darlington base drive with programmable dwell, peak current limit, and desaturation monitoring for 6A/6mH coils.

Use Value: Eliminates coil saturation risk during rapid RPM changes and reduces thermal stress on external Darlington via active desaturation control.

Breakerless Ignition Retrofit Kit

Two-Wheel Vehicle Ignition System

Use Scenario: Retrofit kit upgrades vintage motorcycles or classic cars from contact-breaker ignition to Hall-effect electronic ignition.

IC Role / Device Role / Timing Role: Replaces mechanical breaker points with Hall-triggered dwell control and current-limited coil charging.

Use Value: Delivers maintenance-free operation, eliminates point arcing, and extends coil life through precise peak current regulation.

Use Scenario: Scooter or motorcycle ECU requires compact, thermally robust ignition controller compatible with space-constrained engine bays.

IC Role / Device Role / Timing Role: SO16-packaged L482D1 serves as ignition driver with integrated dump protection and permanent conduction safety for stop-start operation.

Use Value: Reduces BOM count by integrating Hall supply regulation, dwell timing, current sensing, and 100 V load dump response in one SOIC device.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect ignition controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UC3846N	Current-mode PWM controller with 1 A gate drive; no integrated Hall interface, dwell timing, or load dump protection.	Requires external Hall signal conditioning, discrete dwell logic, and TVS for load dump - higher design complexity.	Select only if existing board uses UC3846 footprint and external circuitry already implements missing functions.
TLE8102	Smart 2-channel high-side switch with embedded current sensing and SPI diagnostics; lacks Hall input, dwell timing, and desaturation output.	Designed for generic load switching, not ignition-specific timing; no native support for C2/C5 capacitor-based dwell calculation.	Prefer for non-ignition automotive loads; unsuitable as drop-in replacement due to missing ignition control architecture.

Compared with UC3846N and TLE8102, the L482D1 uniquely integrates Hall-input interface, dual-capacitor dwell timing, desaturation pulse output, and 100 V load dump shutdown - making it purpose-built for breakerless ignition rather than repurposed from generic PWM or switch controllers.

Availability

L482D1 is available at Aetrix Electronics and suitable for automotive ignition modules, engine control units, aftermarket high-energy coil drivers, and two-wheel vehicle electronic ignition systems requiring stable component supply across extended temperature and transient-voltage conditions.

Supply support for L482D1 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 L482D1 belongs to ST's automotive ignition controller product line, engineered specifically for Hall-effect–based breakerless ignition systems requiring integrated dwell control, current limiting, and transient protection in under-hood environments.

FAQ

What is the function of pin 7 (Reference Voltage) in the L482D1?

Pin 7 provides a 2.5–3.5 V reference that biases the internal current sources driving the dwell timing capacitors C2 and C5 (pins 3 and 4) and the permanent conduction timer capacitor C1 (pin 8). A 100 kΩ resistor (R11) between pin 7 and ground sets the timing current, enabling accurate speed-compensated dwell and 1 s conduction timeout.

How does the L482D1 implement load dump protection in SO16 configuration?

In SO16, load dump protection is enabled via pin 10, which connects to an external R8/R9 resistor divider. When battery voltage exceeds the threshold - calculated as V_Dth ≈ 8.5·(R8+R9)/R9 + 0.0005·R8 - the internal circuit disables the Darlington driver and shorts the supply rail, sustaining 100 V transients with ≤300 ms decay per ISO 7637-2.

Why does the L482D1 use two separate timing capacitors (C2 and C5) for dwell control?

C2 and C5 enable closed-loop dwell adjustment: C2 discharges on Hall-falling edge and charges rapidly upon current limiting, while C5 charges on Hall-rising edge. Their voltage comparison determines dwell start time, allowing average C2 voltage to rise at low RPM and fall at high RPM - maintaining constant desaturation time (td) and stable spark energy across engine speed.

Can the L482D1 drive a Darlington without external base resistors?

No. Pin 14 (Driver Collector) and pin 16 (Driving Stage Output) require external resistors: R10 limits power dissipation in the IC's internal driver stage, and R3 (recommended 2 kΩ) stabilizes the open-loop gain of the Darlington base drive circuit. C3 (1–100 nF) must also be added between pins 16 and 13 for phase compensation per application circuit Figure 4.

L482D1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Applications:: -

Current - Supply:: 25mA

Voltage - Supply:: 6V ~ 28V

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

L482D1 FAQ

1.How can I place an order for L482D1 through Aetrix?

Please submit a Request for Quotation (RFQ) for L482D1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for L482D1 reliable?

The price and inventory of L482D1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L482D1 is usually 5 days.

3.What payment methods are accepted for L482D1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L482D1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L482D1?

L482D1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L482D1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for L482D1?

For technical support, including L482D1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L482D1 requirements.

6.How does Aetrix verify that L482D1 is sourced from the original manufacturer or authorized distributors?

All L482D1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L482D1 meets industry standards.

7.What is the process for return or replacement of L482D1?

All L482D1 units undergo pre-shipment inspection (PSI). If there is an issue with L482D1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The L482D1 part is unused and in its original packaging.

Return procedure for L482D1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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