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

STMicroelectronics L7808ACD2T-TR

Name: L7808ACD2T-TR
Brand: STMicroelectronics
SKU: L7808ACD2T-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7808ACD2T-TR

Manufacturer:: STMicroelectronics

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

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: L7808ACD2T-TR.pdf

Description:: IC REG LINEAR 8V 1.5A D2PAK

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Inventory:4,893

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Product details

Overview

L7808ACD2T-TR from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 8 V output at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It operates across 0 to 125 °C junction temperature and maintains ±2 % output voltage tolerance over load, line, and temperature - ideal for industrial power rails, local regulation in motor control boards, and embedded system auxiliary supplies.

For engineers reviewing the L7808ACD2T-TR datasheet, L7808ACD2T-TR pinout, L7808ACD2T-TR application, or L7808ACD2T-TR equivalent, key selection criteria include dropout voltage (2 V @ 1 A), load regulation (≤100 mV), supply voltage rejection (62 dB @ 120 Hz), and D²PAK package thermal resistance (R_thJC = 3 °C/W).

Technical Context

This IC implements a monolithic series pass regulator with internal current limiting, thermal shutdown, and SOA protection - eliminating external protection components. Its architecture relies on a PNP pass transistor controlled by an error amplifier referenced to a precision bandgap voltage source.

Designed for fixed-output operation, it requires only two external capacitors (0.33 µF input, 0.1 µF output) for stability and ripple suppression. The device does not require a minimum load current beyond 5 mA for regulation, simplifying low-power standby designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	8 V ±2 % (guaranteed over temperature, load, and line)
Max output current	1.5 A continuous (limited by thermal design and heatsinking)
Dropout voltage	2 V @ 1 A, 25 °C (minimum input = 10 V for stable 8 V output)
Supply voltage rejection	62 dB @ 120 Hz, 11.5–21.5 V input (rejects AC ripple from unregulated supplies)
Load regulation	≤100 mV (from 5 mA to 1.5 A output change)
Thermal resistance (junction-to-case)	3 °C/W (D²PAK package enables high-power dissipation with minimal case rise)
Operating junction temperature	0 to 125 °C (supports extended industrial environments without derating)

Pinout & Package

Supplied in D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat transfer. Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (IN)	Unregulated DC input	Accepts 10.6–25 V DC; must be ≥10 V to sustain 8 V output under full load
Pin 2 (GND)	Reference and return path	Common ground for input capacitor, output capacitor, and load; critical for noise immunity
Pin 3 (OUT)	Regulated DC output	Delivers stable 8 V to load; requires 0.1 µF ceramic capacitor placed ≤5 mm from pin

Key Features

Feature	Design Value
Fixed 8 V output	Eliminates external resistor network; reduces BOM count and layout sensitivity
Integrated SOA protection	Prevents destruction during transient overloads without external foldback circuitry
2 % output tolerance (A version)	Enables direct replacement in precision 8 V logic or analog supply rails without recalibration
D²PAK thermal performance	R_thJC = 3 °C/W supports >1 A continuous operation with PCB copper pour heatsinking
No minimum load requirement	Stable regulation down to 5 mA load - suitable for sleep-mode or low-power microcontroller peripherals

Applications

Industrial Motor Control Power Supply

Programmable Logic Controller (PLC) I/O Module

Use Scenario: Provides isolated 8 V rail for gate drivers and optocoupler biasing in 24 V DC-fed motor drives.

IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring clean, stable voltage despite input ripple and load transients.

Use Value: Enables reliable MOSFET switching with <2 V dropout margin and 62 dB ripple rejection, reducing need for oversized input filters.

Use Scenario: Powers digital isolators and level-shifting circuits in modular PLC backplane I/O cards.

IC Role / Device Role / Timing Role: Fixed-voltage regulator supplying isolated logic interfaces requiring tight tolerance and low noise.

Use Value: ±2 % output tolerance ensures compatibility with 3.3 V/5 V logic families via level shifters; 10 µV/V noise avoids signal integrity degradation.

Embedded System Auxiliary Rail

Test & Measurement Equipment Bias Supply

Use Scenario: Generates 8 V for op-amp biasing and sensor excitation in battery-backed data loggers.

IC Role / Device Role / Timing Role: Low-quiescent-current (4.3–6 mA) linear regulator supporting always-on monitoring functions.

Use Value: Maintains regulation at 5 mA minimum load - critical for ultra-low-power wake-up circuits without pull-up resistors.

Use Scenario: Supplies reference voltage circuitry and analog front-end stages in portable multimeters.

IC Role / Device Role / Timing Role: Precision local regulator minimizing drift-induced measurement error in analog signal chains.

Use Value: −0.8 mV/°C output drift and 52 µV/V output noise preserve DC accuracy and low-frequency SNR.

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
LM7808CD2T	±2 % tolerance, TO-263 package, but no extended temperature grade (0–125 °C vs. L7808ACD2T-TR's guaranteed 0–125 °C)	Not qualified for extended-temp industrial use; lower SVR (56 dB)	Select when cost sensitivity outweighs temperature assurance and ripple rejection needs.
MC7808CD2TG	±2 % tolerance, D²PAK, but higher quiescent current (8 mA typical) and wider load regulation (≤160 mV)	Higher idle power draw; less stable under dynamic load steps	Choose only if legacy design reuse mandates ON Semiconductor footprint compatibility.

Compared with LM7808CD2T and MC7808CD2TG, L7808ACD2T-TR delivers tighter thermal specification compliance, superior ripple rejection, and lower quiescent current - making it optimal for new industrial designs where reliability across temperature and input variation is mandatory.

Availability

L7808ACD2T-TR is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controller (PLC) modules, and embedded system auxiliary power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L7808ACD2T-TR 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The L78 series targets cost-sensitive, high-reliability linear regulation in industrial and embedded systems - emphasizing robustness, ease of use, and extended temperature operation without external protection components.

FAQ

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

The absolute minimum input is 10.6 V per datasheet Table 5 (VI = 10.6 V min for IO = 5 mA to 1 A). At 1.5 A, dropout remains 2 V, so 10 V is the practical minimum - but 11–12 V is recommended to maintain regulation margin across temperature and line variation.

Can L7808ACD2T-TR be used without an input capacitor?

No. A 0.33 µF ceramic capacitor is mandatory at the input pin per Figure 4 and Table 12 test conditions. Omitting it risks instability, oscillation, or failure to reject high-frequency noise - especially with long input traces or switching supply sources.

How does thermal performance compare between D²PAK and TO-220 packages for this regulator?

D²PAK (R_thJC = 3 °C/W) provides significantly better junction-to-case conduction than TO-220 (R_thJC = 5 °C/W). With identical PCB copper area, D²PAK enables ~30 % higher continuous current before thermal shutdown - critical for compact, sealed industrial enclosures.

Is output voltage adjustable using external resistors?

No - L7808ACD2T-TR is a fixed-output device. While the broader L78 series can be configured as adjustable regulators using external feedback networks, this specific part has internal trimming for 8 V and lacks an adjust pin. Use L7808CD2T-TR only for fixed 8 V applications.

L7808ACD2T-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

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:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

L7808ACD2T-TR FAQ

1.How can I place an order for L7808ACD2T-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L7808ACD2T-TR 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 L7808ACD2T-TR reliable?

The price and inventory of L7808ACD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7808ACD2T-TR is usually 5 days.

3.What payment methods are accepted for L7808ACD2T-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7808ACD2T-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7808ACD2T-TR?

L7808ACD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7808ACD2T-TR 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 L7808ACD2T-TR?

For technical support, including L7808ACD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7808ACD2T-TR requirements.

6.How does Aetrix verify that L7808ACD2T-TR is sourced from the original manufacturer or authorized distributors?

All L7808ACD2T-TR 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 L7808ACD2T-TR meets industry standards.

7.What is the process for return or replacement of L7808ACD2T-TR?

All L7808ACD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7808ACD2T-TR, 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 L7808ACD2T-TR part is unused and in its original packaging.

Return procedure for L7808ACD2T-TR:

1.Submit a request within 90 days.

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

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