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

STMicroelectronics L7805ACP

Name: L7805ACP
Brand: STMicroelectronics
SKU: L7805ACP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7805ACP

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3 Full Pack

Datasheet:: L7805ACP.pdf

Description:: IC REG LINEAR 5V 1.5A TO220FP

Quantity:: RFQ Add To RFQ list

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Inventory:278

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Product details

Overview

L7805ACP from STMicroelectronics is a three-terminal positive fixed-voltage linear regulator delivering 5 V ±2% output at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It operates with input voltages up to 35 V and is commonly used for local on-card regulation in industrial power supplies, embedded control modules, and legacy microcontroller systems requiring stable 5 V rail.

For engineers reviewing the L7805ACP datasheet, L7805ACP pinout, L7805ACP application, or L7805ACP equivalent, key selection considerations include dropout voltage (2 V @ 1 A), load regulation (≤100 mV over 5 mA–1.5 A), quiescent current (8 mA), output noise (40 µV/√Hz), and thermal resistance (R_thJA = 50 °C/W in TO-220FP package).

Technical Context

The L7805ACP implements a monolithic bipolar linear regulator architecture with internal current limiting, thermal shutdown, and SOA protection-enabling robust operation without external protection circuitry. Its feedback loop maintains regulation across line (VI = 7–25 V) and load (IO = 5 mA–1.5 A) variations while sustaining junction temperatures from 0 to 125 °C.

Designed for fixed-output use, it requires only two external capacitors (CI = 0.33 µF, CO = 0.1 µF) for stability per ST's test circuits. The device does not support adjustable output via external resistors but permits basic output current boosting through external pass transistors when heat sinking allows.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	5.0 V ±2% (4.9–5.1 V at 25 °C; 4.75–5.25 V over full load/temp range)
Max output current	1.5 A continuous-requires adequate heatsinking to sustain beyond ~1 A in ambient >50 °C
Dropout voltage	2.0 V @ 1 A-minimum input must be ≥7 V for reliable 5 V output under full load
Line regulation	≤100 mV over VI = 7–25 V-ensures stable output despite raw supply ripple or sag
Load regulation	≤100 mV over IO = 5 mA–1.5 A-supports mixed-signal loads with dynamic current demand
Quiescent current	8 mA-low enough for always-on subsystems but higher than modern LDOs
Output noise	40 µV/√Hz (10 Hz–100 kHz)-suitable for analog sensors and MCU peripherals, not ultra-low-noise ADCs
Thermal resistance	R_thJA = 50 °C/W (TO-220FP)-dictates minimum heatsink size for sustained 1 A operation

Pinout & Package

Package: TO-220FP (3-lead, vertical mounting, isolated tab). Thermal pad electrically connected to Pin 2 (Ground).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Input)	Voltage input terminal	Accepts unregulated DC (7–35 V); requires 0.33 µF ceramic bypass capacitor within 1 cm
Pin 2 (Ground)	Circuit common reference	Return path for load and regulator bias; connects to heatsink tab-must be tied to system GND
Pin 3 (Output)	Regulated 5 V output	Delivers filtered, stabilized 5 V; requires 0.1 µF ceramic output capacitor at point-of-load

Key Features

Feature	Design Value
Internal thermal shutdown	Activates at ~165 °C junction temperature-prevents permanent damage during overload or poor heatsinking
Short-circuit current limit	0.75 A typical (min 0.2 A)-holds output safe during wiring faults or downstream shorts
Safe operating area (SOA) protection	Prevents second breakdown of internal pass transistor during transient overloads or capacitive loads
Fixed 5 V output tolerance	±2% over temperature and load-meets legacy TTL/CMOS logic and older MCU VCC requirements
Extended temperature grade	0 to 125 °C operating junction range-qualified for industrial, not automotive, environments

Applications

Industrial PLC I/O Module

Legacy MCU Power Supply

Use Scenario: Providing clean 5 V to digital input conditioning circuits and optocoupler drivers in programmable logic controllers.

IC Role / Device Role / Timing Role: Local point-of-load regulator replacing centralized 5 V distribution to reduce noise coupling and ground bounce.

Use Value: Eliminates voltage drop and EMI from long PCB traces; thermal protection ensures uptime during field-wiring faults.

Use Scenario: Powering 8-bit microcontrollers (e.g., ATmega328P, PIC16F) and associated peripherals in cost-sensitive embedded devices.

IC Role / Device Role / Timing Role: Primary VCC regulator with minimal external components-no need for external feedback network or enable logic.

Use Value: Reduces BOM count and layout complexity while meeting ±5% VCC tolerance required by legacy MCUs.

DC Motor Driver Logic Supply

Test & Measurement Equipment Bias Rail

Use Scenario: Generating isolated 5 V logic supply for H-bridge gate drivers and current-sense amplifiers in brushed DC motor controllers.

IC Role / Device Role / Timing Role: Decoupled low-noise auxiliary rail-separated from noisy motor power stage using physical layout and local regulation.

Use Value: Prevents logic glitches caused by motor commutation transients; SOA protection survives capacitive turn-on surges.

Use Scenario: Supplying reference voltage circuitry, display controllers, and front-panel interface ICs in benchtop multimeters and signal generators.

IC Role / Device Role / Timing Role: Stable, low-drift bias source where long-term accuracy matters more than ultra-low noise.

Use Value: Output voltage drift of −1.1 mV/°C enables predictable calibration over operating temperature range.

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
LM7805CT	Same 5 V output, but wider output tolerance (±2% typ. vs. ±2% guaranteed), higher R_thJA (65 °C/W), no extended temp grade	Less suitable for high-ambient industrial enclosures; lower short-circuit current (0.5 A min)	Choose for cost-sensitive consumer designs where 0–70 °C operation suffices
MC7805ACT	Identical electrical specs, but different packaging (TO-220 non-isolated); same thermal performance in TO-220FP variant	Requires insulated mounting hardware if heatsink is grounded; otherwise functionally interchangeable	Prefer when sourcing from ON Semiconductor channels or when footprint compatibility with legacy MC78xx layouts is required

Compared with LM7805CT and MC7805ACT, the L7805ACP offers guaranteed ±2% output tolerance across 0–125 °C and superior short-circuit robustness (0.75 A min), making it better suited for industrial environments demanding consistent regulation and fault resilience without derating.

Availability

L7805ACP is available at Aetrix Electronics and suitable for industrial PLCs, legacy MCU-based controllers, DC motor driver logic supplies, and test equipment requiring stable component supply with long lifecycle visibility.

Supply support for L7805ACP 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, rugged local regulation in industrial control, instrumentation, and embedded systems where simplicity and reliability outweigh ultra-low IQ or PSRR requirements.

FAQ

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

The L7805ACP requires a minimum input voltage of 7.0 V to maintain regulation at 1.5 A, based on its 2.0 V dropout specification. At lower inputs-especially near 7 V-output may sag under full load or elevated temperature. For margin, design with VI ≥ 7.5 V and verify thermal performance with actual heatsinking.

Can L7805ACP be used in parallel to increase current capacity?

No-L7805ACP is not designed for parallel operation. Its output voltage tolerance (±2%) and load regulation (≤100 mV) cause unequal current sharing, risking thermal runaway. To deliver >1.5 A, use an external pass transistor with current-sharing resistors or select a higher-current regulator like the L78S05.

Does L7805ACP require both input and output capacitors, and what values are mandatory?

Yes-ST specifies a 0.33 µF ceramic capacitor on the input (within 1 cm of Pin 1) and a 0.1 µF ceramic capacitor on the output (at Pin 3) for stability. Omitting either risks oscillation or poor transient response. Larger bulk capacitors (e.g., 10–100 µF electrolytic) may be added for ripple reduction but do not replace the mandatory ceramics.

Is L7805ACP pin-compatible with older 7805 variants from other manufacturers?

Yes-L7805ACP uses the standard 3-pin TO-220FP footprint (Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output), matching LM7805, MC7805, and UA7805. However, differences in thermal resistance, short-circuit current, and guaranteed tolerance mean direct substitution requires verification of thermal margin and regulation stability in the target application.

L7805ACP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3 Full Pack

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:: Through Hole

Supplier Device Package:: TO-220FP

L7805ACP FAQ

1.How can I place an order for L7805ACP through Aetrix?

Please submit a Request for Quotation (RFQ) for L7805ACP 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 L7805ACP reliable?

The price and inventory of L7805ACP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7805ACP is usually 5 days.

3.What payment methods are accepted for L7805ACP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7805ACP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7805ACP?

L7805ACP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7805ACP 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 L7805ACP?

For technical support, including L7805ACP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7805ACP requirements.

6.How does Aetrix verify that L7805ACP is sourced from the original manufacturer or authorized distributors?

All L7805ACP 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 L7805ACP meets industry standards.

7.What is the process for return or replacement of L7805ACP?

All L7805ACP units undergo pre-shipment inspection (PSI). If there is an issue with L7805ACP, 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 L7805ACP part is unused and in its original packaging.

Return procedure for L7805ACP:

1.Submit a request within 90 days.

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

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