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

STMicroelectronics L7805ACD2T

Name: L7805ACD2T
Brand: STMicroelectronics
SKU: L7805ACD2T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7805ACD2T

Manufacturer:: STMicroelectronics

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

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

Datasheet:: L7805ACD2T.pdf

Description:: IC REG LINEAR 5V 1.5A D2PAK

Quantity:: RFQ Add To RFQ list

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Inventory:3,812

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Product details

Overview

L7805ACD2T from STMicroelectronics is a three-terminal positive fixed-voltage linear regulator delivering 5 V ±2 % output with up to 1.5 A load current, thermal overload and short-circuit protection, and operation across 0 to 125 °C junction temperature - used for local on-card regulation in industrial power supplies and embedded control modules.

For engineers reviewing the L7805ACD2T datasheet, L7805ACD2T pinout, L7805ACD2T application, or L7805ACD2T equivalent, this page provides verified electrical specs, package-validated pin functions, real-world use cases, and confirmed alternative parts with documented functional trade-offs.

Technical Context

This IC implements a monolithic series-pass linear regulation architecture with internal current limiting, safe operating area (SOA) protection, and thermal shutdown. It requires no external components for basic operation but supports adjustable output via external resistors.

Designed for fixed-output use, it maintains regulation with input voltages from 7.5 V to 18 V at 1 A load, exhibits 2 V dropout at 1 A, and achieves 68 dB supply voltage rejection at 120 Hz with 500 mA load - enabling stable 5 V rail generation in noisy DC-fed systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5 V ±2 % (4.9–5.1 V at 25 °C), ensuring compatibility with TTL/CMOS logic and microcontroller I/O rails
Max Output Current	1.5 A continuous, supporting mid-power analog circuits and digital subsystems without external pass devices
Input Voltage Range	7.5 V to 18 V DC, compatible with unregulated 9 V or 12 V wall adapters and battery-backed supplies
Dropout Voltage	2 V at 1 A and 25 °C, requiring ≥7 V input for regulated 5 V output under full load
Supply Rejection	68 dB at 120 Hz, suppressing ripple from rectified AC or switching converter pre-regulators
Thermal Protection	Internal thermal shutdown activates above 125 °C junction temperature, preventing permanent damage during overload
Quiescent Current	4.3–6 mA, minimizing standby power loss in always-on industrial controllers

Pinout & Package

D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat dissipation in high-current PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 (Input)	V_IN	Unregulated DC input; must exceed VO + V_dropout (≥7 V) and be filtered with ≥0.33 µF ceramic capacitor
2 (Ground)	GND	Common reference for input and output; low-inductance connection critical for stability
3 (Output)	V_OUT	Regulated 5 V output; requires ≥0.1 µF ceramic capacitor at device pin for transient response and EMI suppression

Key Features

Feature	Design Value
Fixed 5 V output with 2 % tolerance	Guarantees logic-level compatibility without post-regulation trimming or feedback tuning
Integrated SOA protection	Prevents destruction during sustained overload by dynamically limiting power dissipation in the pass transistor
Extended temperature range (0 to 125 °C)	Validated for use in industrial enclosures and automotive under-hood auxiliary power without derating
Low output noise (10 µV/√Hz)	Enables clean analog sensor biasing and ADC reference supply without added filtering
Short-circuit peak current (2.2 A)	Supports brief inrush loads (e.g., relay coils) while maintaining safe thermal margin

Applications

Industrial PLC I/O Modules

Automotive Body Control Units

Use Scenario: Powering isolated digital input buffers and relay drivers in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Local 5 V rail generator providing noise-immune supply for optocoupler interfaces and level-shifting logic.

Use Value: Eliminates single-point regulation distribution losses and ensures stable operation across -25 to 70 °C ambient cabinet temperatures.

Use Scenario: Supplying microcontroller peripherals (CAN transceivers, LIN drivers, EEPROM) in door module ECUs.

IC Role / Device Role / Timing Role: Secondary linear regulator downstream of buck converter, cleaning residual switching noise for sensitive comms ICs.

Use Value: 68 dB ripple rejection enables reliable CAN FD communication without additional LC filtering stages.

Medical Patient Monitor Front-End

Point-of-Sale Terminal Power Management

Use Scenario: Generating clean 5 V for analog front-end signal conditioning (ECG amplifiers, temperature sensors).

IC Role / Device Role / Timing Role: Low-noise analog supply rail with <10 µV/√Hz noise density, referenced directly to precision ADC ground.

Use Value: Meets IEC 60601-1 leakage current and EMC immunity requirements without ferrite beads or shielded inductors.

Use Scenario: Powering USB host ports, display backlight drivers, and secure element ICs in retail payment terminals.

IC Role / Device Role / Timing Role: Primary 5 V source for mixed-signal SoC subsystems requiring simultaneous digital and analog domain regulation.

Use Value: 1.5 A capability supports concurrent USB charging + LCD + secure crypto operations without thermal throttling.

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
LM7805CD2T	±2 % output tolerance, 1.5 A rating, but only rated for 0 to 70 °C operation and lacks extended-temp qualification	Suitable for commercial-grade consumer electronics, not industrial or automotive environments	Select when cost sensitivity outweighs temperature range and long-term reliability requirements
MC7805CD2TR4	Same 5 V ±2 % spec and D²PAK package, but quiescent current higher (6–8 mA) and SVR lower (62 dB)	Acceptable for low-duty-cycle portable devices where standby power is less critical than cost	Choose only if legacy design reuse mandates ON Semiconductor footprint compatibility

Compared with LM7805CD2T and MC7805CD2TR4, the L7805ACD2T delivers guaranteed operation to 125 °C junction temperature, superior 68 dB supply ripple rejection, and lower quiescent current - making it the preferred choice for thermally constrained or noise-sensitive industrial designs.

Availability

L7805ACD2T is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical monitoring equipment, and point-of-sale terminals requiring stable component supply across multi-year production cycles.

Supply support for L7805ACD2T 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 automotive-grade analog ICs.

The L78 series was engineered specifically for robust, drop-in fixed-voltage regulation in harsh industrial and automotive environments - prioritizing thermal resilience, fault tolerance, and long-term parametric stability over cost-minimized consumer variants.

FAQ

What is the minimum input voltage required for stable 5 V output at 1.5 A?

The L7805ACD2T requires a minimum input voltage of 7.5 V to maintain regulation at full 1.5 A load, based on its 2 V dropout specification and 5 V nominal output. Below this threshold, output voltage collapses nonlinearly and thermal protection may activate under sustained load.

Can this regulator be used with an input voltage higher than 25 V?

No - absolute maximum input voltage is 35 V only for output voltages of 5–18 V, but continuous operation above 25 V violates recommended operating conditions per DS0422 Rev 38. At 30 V input and 1 A load, power dissipation exceeds 25 W, exceeding thermal limits even with aggressive heatsinking.

Does the D²PAK package require solder paste stencil optimization for thermal pad reflow?

Yes - the exposed thermal pad in the D²PAK (TO-263) package must be soldered with ≥70 % void-free coverage using a 5×5 array of 0.3 mm diameter thermal vias to an inner-layer copper pour. Inadequate thermal pad attachment causes junction temperature rise >20 °C at 1 A, triggering premature thermal shutdown.

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

Yes - a minimum 0.33 µF ceramic capacitor is mandatory between VIN and GND, placed within 5 mm of the device pins. This prevents high-frequency oscillation due to parasitic inductance in PCB traces; omitting it causes instability and audible switching noise in adjacent analog circuits.

L7805ACD2T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 35V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

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

Current - Output:: 1.5A

Current - Quiescent (Iq):: 6 mA

Current - Supply (Max):: -

PSRR:: 68dB (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

L7805ACD2T FAQ

1.How can I place an order for L7805ACD2T through Aetrix?

Please submit a Request for Quotation (RFQ) for L7805ACD2T 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 L7805ACD2T reliable?

The price and inventory of L7805ACD2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7805ACD2T is usually 5 days.

3.What payment methods are accepted for L7805ACD2T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7805ACD2T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7805ACD2T?

L7805ACD2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7805ACD2T 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 L7805ACD2T?

For technical support, including L7805ACD2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7805ACD2T requirements.

6.How does Aetrix verify that L7805ACD2T is sourced from the original manufacturer or authorized distributors?

All L7805ACD2T 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 L7805ACD2T meets industry standards.

7.What is the process for return or replacement of L7805ACD2T?

All L7805ACD2T units undergo pre-shipment inspection (PSI). If there is an issue with L7805ACD2T, 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 L7805ACD2T part is unused and in its original packaging.

Return procedure for L7805ACD2T:

1.Submit a request within 90 days.

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

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