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

STMicroelectronics L484D1

Name: L484D1
Brand: STMicroelectronics
SKU: L484D1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L484D1

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

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

Datasheet:: L484D1.pdf

Description:: IC CTRLR HALL EFFECT IGN SOIC-16

Quantity:: RFQ Add To RFQ list

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Inventory:4,356

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Product details

Overview

L484D1 from STMicroelectronics is a magnetic pickup ignition controller IC for breakerless automotive ignition systems, directly driving external NPN Darlington transistors. It provides dwell angle control, coil current peak limitation (200–320 mV sensing threshold), continuous coil current protection, tachometer signal output (open-collector, 10 mA sink), and load dump/reverse battery protection (100 V dump withstand, –14 V reverse). Used in high-energy ignition coils with variable-speed engines.

For engineers reviewing the L484D1 datasheet, L484D1 pinout, L484D1 application, or L484D1 equivalent, key selection criteria include dwell timing adaptability across RPM ranges, magnetic pickup waveform flexibility (via pins 2, 6, 7, 8), integrated overvoltage protection for external Darlingtons (pin 15), and thermal robustness in SO16 package (R_{th j-al} = 50 °C/W).

Technical Context

The L484D1 implements dual-input magnetic pickup interface: pin 8 serves as zero-crossing detector for ignition timing actuation, while pin 2 sets dwell time based on negative pickup voltage amplitude and includes hysteresis (100–200 mV) to suppress spurious sparks. Pin 7 hosts a dwell control timer (100 nF recommended) with resistor divider R_b/R_c enabling stable ON-state confirmation.

Dwell adaptation across engine speeds is achieved via pin 6 (dwell adjust) and external resistor R_a (≤200 kΩ) between pins 6 and 11, allowing dynamic reduction of desaturation time at high RPM. Permanent conduction protection uses pin 3 (capacitor-set delay, e.g., 50 nF → 75 ms typical) and pin 4 (inhibit input, ≤0.7 V disables protection).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	6–28 V - supports wide automotive battery variation including cranking and load dump recovery.
Current Sensing Threshold	200–320 mV at pin 1 - sets precise coil current limit independent of supply voltage (6–16 V).
Zero-Crossing Threshold	3–60 mV at pin 8 - enables reliable ignition trigger detection even with low-amplitude pickup signals.
Tach Output Sink Current	10 mA max at pin 5 - drives standard automotive tachometers without external buffering.
Dump Protection Threshold	Adjustable via R₈/R₉ divider - sets clamp point for 100 V load dump events per ISO/DP 7637/1.
Overvoltage Protection	25–35 V zener at pin 15 - safeguards external Darlington against inductive kickback.
Thermal Resistance	R_{th j-al} = 50 °C/W (SO16) - enables direct mounting to aluminum heatsink for sustained high-current operation.

Pinout & Package

Package: SO16 narrow-body surface-mount (9.8 × 5.8 mm, 1.27 mm pitch, 0.20 g weight), rated for junction temperature up to 150 °C and storage down to –55 °C.

Pin/Terminal	Circuit Role	Design Meaning
1	Current Sensing Input	Connects to sense resistor (R_SENS) to monitor primary coil current; triggers feedback loop at 200–320 mV.
2	Pickup Input	Sets dwell time via negative pickup voltage amplitude; adjustable with R₁₁ for pickup waveform matching.
3	Permanent Conduction Timer	Capacitor (e.g., 50 nF) sets 75 ms typical desaturation delay to prevent coil burnout during sensor failure.
4	Protection Inhibit	Logic-low (≤0.7 V) disables permanent conduction protection - used in anti-knock logic override.
5	RPM Output	Open-collector tach signal; sinks up to 10 mA when Darlington is ON - directly interfaces analog/digital tachometers.
6	Dwell Time Adjust	External resistor R_a (≤200 kΩ) between pins 6 and 11 reduces desaturation time at high RPM for dwell ratio tuning.
7	Dwell Control Timer	100 nF capacitor sets dwell timing reference; R_b/R_c provide hysteresis to stabilize ON state.
8	Zero Crossing Input	Detects magnetic pickup zero-crossing for ignition timing; threshold 3–60 mV with 100–200 mV hysteresis.
9	Power-On Input	Logic-low forces Darlington conduction - enables spark delay in anti-knock systems while retaining all protections.
10	Signal Ground	Reference node for internal comparators and sensing circuits; must be low-impedance connection to chassis ground.
11	Power Supply	Input with integrated 7 V zener (6.5–8.8 V); R₉ limits zener current for >14 V supply conditions.
12	Dump Protection	Internal clamp circuit activates at user-defined threshold (via R₈/R₉) to short supply during 100 V load dump.
14	Driver Collector Input	Supplies collector current to internal driver stage; R₁₀ limits power dissipation in IC during Darlington drive.
15	Overvoltage Limitation	25–35 V internal zener referenced to external R₅/R₆ divider - clamps Darlington collector voltage.
16	Driving Stage Output	Direct Darlington base drive output; requires 2.2 nF capacitor to pin 1 for current loop stability.

Key Features

Feature	Design Value
Dual-input magnetic pickup interface	Separate zero-crossing (pin 8) and dwell-setting (pin 2) inputs enable precise timing and adaptive dwell control.
Programmable dwell ratio	Resistor-adjustable dwell time via pins 2, 6, and 7 allows optimization across engine speed and coil inductance.
Integrated anti-knock support	Pin 9 "Power-On" input forces conduction with spark delay while maintaining current limiting and dump protection.
Robust automotive protection suite	Simultaneous reverse battery (–14 V), load dump (100 V), Darlington overvoltage (25–35 V), and permanent conduction protection.
ISO/DP 7637/1 compliance	Validated in recommended application circuit for automotive transient immunity per ISO standard.

Applications

Ignition Timing Control

Engine Knock Suppression

Use Scenario: Controlling spark timing in distributorless ignition systems using variable-reluctance magnetic pickups on 4–8 cylinder gasoline engines.

IC Role / Device Role / Timing Role: Primary ignition controller managing dwell angle, coil current saturation, and zero-crossing-triggered spark event generation.

Use Value: Enables consistent spark energy delivery across 0–8000 RPM by dynamically adjusting dwell time and compensating for pickup waveform distortion at high speed.

Use Scenario: Delaying spark timing under high-compression or high-temperature conditions to prevent detonation in performance or turbocharged engines.

IC Role / Device Role / Timing Role: Provides hardware-level spark delay via pin 9 "Power-On" input synchronized with tach signal (pin 5) and engine condition logic.

Use Value: Maintains full current limiting, dump protection, and conduction monitoring during delayed spark events - no safety compromise.

High-Energy Coil Driver

Automotive Tachometer Interface

Use Scenario: Driving high-inductance, high-current ignition coils (e.g., 5–10 mH, 5–8 A peak) in off-road, marine, or industrial engines.

IC Role / Device Role / Timing Role: High-side Darlington driver controller with active current regulation and thermal-safe desaturation timing.

Use Value: Prevents coil overheating via continuous current protection (pin 3/4) and peak current limiting (pin 1), extending coil life under sustained high-load operation.

Use Scenario: Generating calibrated RPM signal for analog needle tachometers or digital ECU dashboards in OEM and aftermarket instrumentation.

IC Role / Device Role / Timing Role: Dedicated open-collector tach output (pin 5) synchronized to Darlington ON-time with 10 mA sink capability.

Use Value: Eliminates need for external level-shifting or buffering; compatible with 5 V or 12 V tach inputs and immune to pickup noise due to zero-crossing synchronization.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC3378A	Single-input architecture; no dedicated dwell adjust pin; fixed hysteresis; lower max supply (26 V)	Lacks pin 6-based dwell ratio tuning and anti-knock pin 9 functionality; less flexible for multi-cylinder or high-RPM calibration	Select when cost sensitivity outweighs dwell adaptability and anti-knock requirements.
UC3846N	Current-mode PWM controller; no magnetic pickup interface; requires external zero-crossing circuitry and dwell logic	Not drop-in; demands full custom timing design and additional comparators/sensors for ignition use	Choose only for highly customized ignition systems where full PWM control and external sensor integration are required.

Compared with MC3378A and UC3846N, the L484D1 uniquely integrates dual-input magnetic pickup handling, programmable dwell ratio, and hardware anti-knock support in a single SO16 IC - reducing BOM count and eliminating external timing logic for production automotive ignition modules.

Availability

L484D1 is available at Aetrix Electronics and suitable for automotive ignition module manufacturing, engine control unit (ECU) repair, and high-reliability marine/off-road ignition system development requiring stable component supply and long-lifecycle support.

Supply support for L484D1 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, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade analog devices.

The L484D1 belongs to ST's automotive ignition controller product line, engineered specifically for breakerless ignition systems using variable-reluctance magnetic pickups and external Darlington drivers in harsh-temperature, high-transient environments.

FAQ

What is the function of pin 9 ("Power-On Input") in anti-knock operation?

Pin 9 forces the external Darlington into conduction regardless of dwell timing calculations, enabling hardware-level spark delay. During this mode, current limiting (pin 1), permanent conduction protection (pins 3/4), and dump protection (pin 12) remain fully active - ensuring safety and reliability while suppressing knock.

How does the L484D1 adapt to different magnetic pickup waveforms?

It uses three configurable inputs: pin 2 adjusts dwell start threshold via R₁₁, pin 6 modifies desaturation time via R_a (to pin 11), and pin 7 sets dwell timing reference with C₂. Combined with hysteresis on pin 8, this allows calibration across low-amplitude, high-frequency, or distorted pickup signals without redesigning the core circuit.

Can the L484D1 drive a Darlington without external current-limiting resistors?

No. External resistors are mandatory: R₁₀ (pin 14) limits driver-stage dissipation, R₅/R₆ (pin 15) set Darlington overvoltage clamp, and R₈/R₉ (pin 12/pin 11) define dump protection threshold. Omitting any compromises protection integrity and thermal safety.

Is the L484D1 compliant with automotive transient standards?

Yes - when used in the manufacturer-recommended application circuit (including R₉, R₁₀, D_z, and external diode D₁), the L484D1 meets ISO/DP 7637/1 for load dump, reverse battery, and supply voltage transients, verified per STMicroelectronics' application note AN2012.

L484D1 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:: -

Voltage - Supply:: 6V ~ 28V

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

L484D1 FAQ

1.How can I place an order for L484D1 through Aetrix?

Please submit a Request for Quotation (RFQ) for L484D1 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 L484D1 reliable?

The price and inventory of L484D1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L484D1 is usually 5 days.

3.What payment methods are accepted for L484D1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L484D1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L484D1?

L484D1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L484D1 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 L484D1?

For technical support, including L484D1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L484D1 requirements.

6.How does Aetrix verify that L484D1 is sourced from the original manufacturer or authorized distributors?

All L484D1 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 L484D1 meets industry standards.

7.What is the process for return or replacement of L484D1?

All L484D1 units undergo pre-shipment inspection (PSI). If there is an issue with L484D1, 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 L484D1 part is unused and in its original packaging.

Return procedure for L484D1:

1.Submit a request within 90 days.

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

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