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

STMicroelectronics L7808ABF

Name: L7808ABF
Brand: STMicroelectronics
SKU: L7808ABF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7808ABF

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: L7808ABF.pdf

Description:: IC REG LINEAR 8V 1.5A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,442

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Product details

Overview

L7808ABF from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 8 V output with up to 1.5 A continuous current, ±2 % output voltage tolerance, thermal overload and short-circuit protection, and operation across –40 °C to +125 °C junction temperature-used for local regulation in industrial power supplies and embedded control modules.

For engineers reviewing the L7808ABF datasheet, L7808ABF pinout, L7808ABF application, or L7808ABF equivalent, this page provides verified electrical specs, TO-220FP package details, thermal resistance data (R_thJC = 5 °C/W), load/line regulation limits (≤30 mV/100 mV), and design-meaningful alternatives for automotive-grade 8 V rail generation.

Technical Context

The L7808ABF implements a monolithic series pass transistor architecture with internal current limiting, safe operating area (SOA) protection, and thermal shutdown-enabling robust operation without external protection circuitry. Its fixed-output topology eliminates feedback network design complexity while maintaining stability with standard 0.33 µF input and 0.1 µF output capacitors.

It operates as a low-dropout-capable linear regulator with 2 V dropout at 1 A, 62 dB supply voltage rejection at 120 Hz, and 18 mΩ output impedance-making it suitable for noise-sensitive analog subsystems where switching ripple must be avoided and thermal management is feasible via heatsinking.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	8 V ±2 % (guaranteed over –40 °C to +125 °C; enables stable logic/motor driver bias without trimming)
Max output current	1.5 A continuous (supports high-current microcontroller peripherals or sensor arrays with margin)
Dropout voltage	2 V at 1 A (requires ≥10 V input for regulated 8 V output; dictates minimum unregulated supply headroom)
Line regulation	5–40 mV (input variation from 10.4 V to 23 V causes ≤40 mV output shift; critical for variable-input systems)
Load regulation	30 mV (output shifts ≤30 mV from 5 mA to 1.5 A load; ensures consistent voltage under dynamic load changes)
Supply rejection	62 dB at 120 Hz (attenuates 120 Hz ripple by >1,200×; essential for AC-DC-derived inputs)
Thermal resistance	R_thJC = 5 °C/W (junction-to-case; defines heatsink interface requirement for sustained 1.5 A operation)

Pinout & Package

Supplied in TO-220FP package: insulated case, vertical mounting, 3-pin through-hole configuration with integrated heatsink tab. Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Input)	Unregulated DC input	Accepts 10.4–35 V DC; requires ≥0.33 µF ceramic capacitor within 2 cm for stability
Pin 2 (Ground)	Common reference node	Low-impedance return path shared between input and output capacitors; must be star-connected to minimize noise coupling
Pin 3 (Output)	Regulated 8 V output	Delivers up to 1.5 A; requires ≥0.1 µF ceramic capacitor directly at pin for high-frequency PSRR

Key Features

Feature	Design Value
Extended temperature range	–40 °C to +125 °C operation (supports under-hood automotive and industrial motor control environments)
Output voltage tolerance	±2 % over full temperature/load range (eliminates need for post-regulation trimming in cost-sensitive designs)
Integrated protection	Thermal shutdown + short-circuit + SOA limiting (prevents failure during fault conditions without external circuitry)
No external components required	Stable with 0.33 µF input / 0.1 µF output ceramics (reduces BOM count and layout area vs. adjustable regulators)
Low quiescent current	4.3–6 mA (minimizes standby power loss in always-on systems such as alarm controllers)

Applications

Industrial PLC I/O Module

Automotive Body Control Unit

Use Scenario: Powering isolated digital I/O drivers and analog sensor signal conditioning circuits on modular PLC backplanes.

IC Role / Device Role / Timing Role: Local 8 V rail generator providing clean, thermally robust supply for optocoupler drivers and ADC reference buffers.

Use Value: Eliminates single-point regulation distribution losses and maintains ±2 % accuracy across –25 °C to +70 °C ambient cabinet temperatures.

Use Scenario: Supplying 8 V to LIN transceivers, window lift motor controllers, and interior lighting drivers in vehicle door modules.

IC Role / Device Role / Timing Role: Primary linear regulator for non-safety-critical 8 V sub-rail, interfacing with 12 V battery with transient tolerance.

Use Value: Withstands load dump pulses up to 35 V input and sustains 1.2 A continuous current at +105 °C ambient per ISO 16750-2.

Medical Infusion Pump Controller

Point-of-Sale Terminal Power Management

Use Scenario: Generating stable 8 V for stepper motor drivers and touch-screen controller ICs in Class II medical devices.

IC Role / Device Role / Timing Role: Safety-isolated secondary-side regulator ensuring low-noise, drift-stable voltage for precision motor sequencing.

Use Value: 10 µV/√Hz output noise and –0.8 mV/°C drift enable <1 LSB error in 12-bit DAC-based flow calibration.

Use Scenario: Providing regulated 8 V to thermal print head drivers and EMV contactless reader ICs in retail terminals.

IC Role / Device Role / Timing Role: Compact, heatsink-compatible local regulator replacing bulkier switching solutions near noise-sensitive RF sections.

Use Value: 62 dB SVR suppresses switching noise from adjacent 5 V buck converters, preventing NFC communication errors.

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
LM7808CDT	±2 % tolerance, 0 to +125 °C range, R_thJC = 5 °C/W, but no extended low-temp rating	Restricted to commercial/industrial ambient (0 °C min); unsuitable for cold-climate automotive or outdoor equipment	Select when cost is primary and operating temperature stays above 0 °C
MC7808BD2TR4	±4 % tolerance, –40 to +125 °C, TO-220 package, higher quiescent current (8 mA)	Looser output accuracy impacts analog sensor biasing; higher I_q increases standby power in battery-backed systems	Choose only if legacy compatibility or dual-source qualification is required

Compared with LM7808CDT and MC7808BD2TR4, the L7808ABF uniquely combines automotive-grade temperature range, tight ±2 % tolerance, and low 4.3–6 mA quiescent current-making it optimal for space-constrained, thermally demanding, and accuracy-critical 8 V rail generation.

Availability

L7808ABF is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical infusion pump controllers, and point-of-sale terminal power management requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for L7808ABF 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The L78 series belongs to ST's legacy positive voltage regulator IC product line, designed specifically for cost-effective, robust local DC-DC conversion in resource-constrained embedded systems where simplicity, reliability, and thermal resilience are prioritized over efficiency.

FAQ

What is the minimum input voltage required for stable 8 V output at 1.5 A?

The L7808ABF requires a minimum input voltage of 10.4 V to maintain regulation at full 1.5 A load and 25 °C junction temperature, based on its 2 V dropout specification. At elevated temperatures or higher current, derating is necessary-consult thermal data (R_thJC = 5 °C/W) and ensure adequate heatsinking to avoid thermal shutdown.

Can L7808ABF be used in parallel for higher current?

No-L7808ABF is not designed for parallel operation. Its output voltage tolerance (±2 %) and lack of current-sharing features cause unequal load distribution, risking thermal runaway in one device. For >1.5 A, use a single higher-current regulator (e.g., L7808ABV) or switch to a switching solution with current-sharing capability.

Is an input capacitor mandatory, and what value is recommended?

Yes-an input capacitor is mandatory for stability. STMicroelectronics specifies a minimum 0.33 µF ceramic capacitor placed within 2 cm of the input pin. For improved transient response and ripple rejection, a 10 µF tantalum or aluminum electrolytic capacitor in parallel is recommended, especially when input source impedance is high or line length exceeds 5 cm.

Does L7808ABF require a heat sink in all applications?

A heat sink is required whenever power dissipation exceeds ~1.5 W-calculated as (V_IN – 8 V) × I_OUT. For example, at 15 V input and 1 A load, dissipation is 7 W, necessitating a heatsink with R_thJA ≤ 17 °C/W (per TO-220FP datasheet). Without heatsinking, continuous operation is limited to ≤0.3 A at 15 V input in still air.

L7808ABF 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):: 8V

Voltage - Output (Max):: -

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

Current - Output:: 1.5A

Current - Quiescent (Iq):: 6 mA

Current - Supply (Max):: -

PSRR:: 62dB (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

L7808ABF FAQ

1.How can I place an order for L7808ABF through Aetrix?

Please submit a Request for Quotation (RFQ) for L7808ABF 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 L7808ABF reliable?

The price and inventory of L7808ABF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7808ABF is usually 5 days.

3.What payment methods are accepted for L7808ABF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7808ABF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7808ABF?

L7808ABF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7808ABF 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 L7808ABF?

For technical support, including L7808ABF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7808ABF requirements.

6.How does Aetrix verify that L7808ABF is sourced from the original manufacturer or authorized distributors?

All L7808ABF 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 L7808ABF meets industry standards.

7.What is the process for return or replacement of L7808ABF?

All L7808ABF units undergo pre-shipment inspection (PSI). If there is an issue with L7808ABF, 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 L7808ABF part is unused and in its original packaging.

Return procedure for L7808ABF:

1.Submit a request within 90 days.

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

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