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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics L7809ABV-DG

Name: L7809ABV-DG
Brand: STMicroelectronics
SKU: L7809ABV-DG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7809ABV-DG

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-220-3

Datasheet:: L7809ABV-DG.pdf

Description:: IC REG LINEAR 9V 1.5A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:3,096

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Product details

Overview

L7809ABV-DG from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 9 V output with up to 1.5 A continuous current, thermal overload protection, short-circuit protection, and SOA safeguarding. It operates across –40 °C to +125 °C junction temperature and maintains ±2 % output voltage tolerance at 25 °C, making it suitable for industrial power rails in motor control interfaces and embedded sensor subsystems.

For engineers reviewing the L7809ABV-DG datasheet, L7809ABV-DG pinout, L7809ABV-DG application, or L7809ABV-DG equivalent, key selection criteria include dropout voltage (2 V @ 1 A), load regulation (≤100 mV over 5 mA–1 A), supply voltage rejection (61 dB @ 120 Hz), quiescent current (4.3–6 mA), and thermal resistance (R_thJC = 5 °C/W in TO-220FP).

Technical Context

This IC implements a monolithic series-pass regulator architecture with internal current limiting, thermal shutdown, and safe operating area (SOA) protection-enabling robust local regulation without external compensation. Its fixed 9 V output is trimmed during production to meet ±2 % tolerance at 25 °C and drifts at –0.8 mV/°C over temperature.

The device requires minimum 5 mA load current for regulation stability and supports input voltages from 11.5 V to 22 V under full-load conditions. Dropout voltage remains constant at 2 V across 1 A load and 25 °C, while output noise is specified at 10 µV/√Hz (10 Hz–100 kHz bandwidth).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	9 V ±2 % at 25 °C; ensures stable logic-level rail for 9 V–tolerant microcontrollers and analog front-ends
Max Output Current	1.5 A continuous; supports high-current peripherals like relays, solenoids, and LED arrays
Droput Voltage	2 V @ 1 A, 25 °C; defines minimum headroom needed between input and output for regulation
Line Regulation	≤90 mV (VI = 11.4–23 V); limits output variation due to input supply ripple or sag
Load Regulation	≤100 mV (IO = 5 mA–1 A); maintains voltage accuracy across dynamic load steps
Supply Rejection	61 dB @ 120 Hz; attenuates low-frequency AC components on unregulated DC inputs
Quiescent Current	4.3–6 mA; determines no-load power loss in always-on systems
Operating Temp	–40 °C to +125 °C junction; validated for automotive under-hood and industrial control environments

Pinout & Package

Supplied in TO-220FP package (3-pin, vertical mounting, isolated tab), featuring integrated heat sink interface and creepage-enhanced insulation for safety-critical applications.

Pin/Terminal	Circuit Role	Design Meaning
Input (IN)	Unregulated DC input connection	Accepts 11.5–22 V DC; must be decoupled with ≥0.33 µF ceramic capacitor near pin
Ground (GND)	Reference node and thermal path	Serves as common return and primary heat conduction path to PCB copper pour or heatsink
Output (OUT)	Regulated 9 V DC source	Delivers stable 9 V to load; requires ≥0.1 µF ceramic capacitor at pin for transient stability

Key Features

Feature	Design Value
Thermal Overload Protection	Automatic shutdown below 165 °C junction temperature; recovers after cooldown without latch
Short-Circuit Current Limit	0.2 A sustained, 2.2 A peak; prevents damage during wiring faults or capacitive inrush
Output Voltage Tolerance	±2 % at 25 °C (A-grade); eliminates need for post-regulation trimming in cost-sensitive designs
Extended Temperature Range	–40 °C to +125 °C operation; qualified per industrial and automotive ambient requirements
SOA Protection	Internal circuitry prevents destructive second breakdown during transient overloads
Low Output Noise	10 µV/√Hz (10 Hz–100 kHz); suitable for noise-sensitive analog signal chains and ADC references

Applications

Industrial Motor Control

Automotive Body Electronics

Use Scenario: Powering gate drivers and Hall-effect sensors in 24 V-based BLDC motor controllers.

IC Role / Device Role / Timing Role: Local 9 V rail generator isolating sensitive analog and logic circuitry from noisy motor bus.

Use Value: Maintains 9 V ±2 % despite 24 V supply ripple and load transients up to 1.5 A, reducing need for additional filtering.

Use Scenario: Supplying infotainment display backlight drivers and CAN transceiver bias in passenger compartment modules.

IC Role / Device Role / Timing Role: Stable 9 V reference for analog dimming circuits and level-shifting interfaces.

Use Value: Operates reliably from –40 °C to +125 °C ambient and rejects battery ripple up to 61 dB, ensuring consistent brightness and communication integrity.

Programmable Logic Controllers

Medical Diagnostic Sensors

Use Scenario: Providing auxiliary 9 V power to isolated I/O expansion modules in modular PLC backplanes.

IC Role / Device Role / Timing Role: On-card regulation replacing centralized supplies to minimize distribution losses and ground bounce.

Use Value: Delivers 1.5 A with ≤100 mV load regulation across module hot-swap events, improving system uptime and diagnostics accuracy.

Use Scenario: Biasing precision op-amps and low-noise amplifiers in portable ECG front-end signal conditioning.

IC Role / Device Role / Timing Role: Ultra-low-noise 9 V analog supply decoupled from digital subsystems.

Use Value: 10 µV/√Hz output noise and 17 mΩ output impedance preserve signal-to-noise ratio in sub-µV biomedical measurements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM7809CDT/NOPB	±4 % output tolerance (C-grade), 0–125 °C temp range, R_thJA = 50 °C/W (TO-220)	Not rated for extended industrial or automotive temperature extremes	Select when cost sensitivity outweighs precision and wide-temp operation
MC7809BD2TR4	±2 % tolerance, –40 °C to +125 °C, but higher quiescent current (8 mA typical)	Higher no-load power draw reduces battery life in always-on portable devices	Prefer when legacy design compatibility with ON Semiconductor footprint is required

Compared with LM7809CDT/NOPB and MC7809BD2TR4, L7809ABV-DG offers tighter initial tolerance, lower quiescent current, and superior thermal resistance in TO-220FP-making it optimal for space-constrained, wide-temperature, and energy-efficient industrial power designs.

Availability

L7809ABV-DG is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, programmable logic controllers, and medical diagnostic sensors requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for L7809ABV-DG 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 silicon solutions for smart driving, power management, and embedded processing.

L7809ABV-DG belongs to the L78 positive voltage regulator IC family, engineered for rugged, cost-effective local DC-DC conversion in industrial, automotive, and consumer equipment where reliability and thermal resilience are critical.

FAQ

What is the minimum input voltage required for stable 9 V output at 1 A load?

The L7809ABV-DG requires a minimum input voltage of 11.5 V to maintain regulation at 1 A load and 25 °C, based on its 2 V dropout specification. At higher temperatures or with reduced heatsinking, input voltage should be increased to ensure margin against thermal derating and line sag.

Can this regulator be used without an input bypass capacitor?

No. A minimum 0.33 µF ceramic capacitor must be placed within 1 cm of the IN pin to prevent oscillation and ensure stability under fast load transients. Omitting it risks high-frequency instability, especially with long input traces or inductive sources.

Does the TO-220FP package require electrical isolation from the heatsink?

Yes. The TO-220FP variant features an electrically isolated tab, allowing direct mechanical mounting to a grounded heatsink without shorting the output terminal. This simplifies thermal design while maintaining functional isolation between output and chassis ground.

How does the L7809ABV-DG behave during short-circuit events?

Under short-circuit, the device limits sustained current to 0.2 A and delivers up to 2.2 A peak briefly before thermal shutdown activates. Recovery occurs automatically once junction temperature falls below ~140 °C, enabling self-resetting fault protection without external circuitry.

L7809ABV-DG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 35V

Voltage - Output (Min/Fixed):: 9V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 2V @ 1A (Typ)

Current - Output:: 1.5A

Current - Quiescent (Iq):: 6 mA

Current - Supply (Max):: -

PSRR:: 61dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

L7809ABV-DG FAQ

1.How can I place an order for L7809ABV-DG through Aetrix?

Please submit a Request for Quotation (RFQ) for L7809ABV-DG 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 L7809ABV-DG reliable?

The price and inventory of L7809ABV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7809ABV-DG is usually 5 days.

3.What payment methods are accepted for L7809ABV-DG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7809ABV-DG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7809ABV-DG?

L7809ABV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7809ABV-DG 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 L7809ABV-DG?

For technical support, including L7809ABV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7809ABV-DG requirements.

6.How does Aetrix verify that L7809ABV-DG is sourced from the original manufacturer or authorized distributors?

All L7809ABV-DG 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 L7809ABV-DG meets industry standards.

7.What is the process for return or replacement of L7809ABV-DG?

All L7809ABV-DG units undergo pre-shipment inspection (PSI). If there is an issue with L7809ABV-DG, 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 L7809ABV-DG part is unused and in its original packaging.

Return procedure for L7809ABV-DG:

1.Submit a request within 90 days.

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

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