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

Diodes Incorporated AS7805AT-G1

Name: AS7805AT-G1
Brand: Diodes Incorporated
SKU: AS7805AT-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AS7805AT-G1

Manufacturer:: Diodes Incorporated

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

Package:: TO-220-3

Datasheet:: AS7805AT-G1.pdf

Description:: IC REG LINEAR 5V 1A TO220-3

Quantity:: RFQ Add To RFQ list

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Inventory:1,337

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Product details

Overview

AS7805AT-G1 from Diodes Incorporated is a fixed 5V, 1A three-terminal positive linear voltage regulator in TO-220-3 package with ±4% output voltage accuracy over –40°C to +125°C, internal thermal shutdown, and safe-area protection. It delivers stable local regulation for microprocessor power supplies and post-regulation after switching converters.

For engineers reviewing the AS7805AT-G1 datasheet, AS7805AT-G1 pinout, AS7805AT-G1 application, or AS7805AT-G1 equivalent, key selection criteria include dropout voltage (2V at 1A), line/load regulation (≤50 mV), PSRR (70 dB at 120 Hz), and thermal resistance (θ_JA = 60°C/W).

Technical Context

The AS7805AT-G1 integrates a pass transistor with internal current limiting, thermal overload protection, and safe-area compensation to prevent damage under sustained overload or high ambient temperature. Its architecture ensures stable operation without external compensation components across capacitive loads up to 100 µF.

It operates with input voltages from 7.5 V to 25 V and maintains regulated 5 V output across load currents from 5 mA to 1 A. The device exhibits low quiescent current (3.2–6 mA) and minimal output noise (10 µV/√Hz), making it suitable for noise-sensitive analog and digital subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±4% over full temperature range - ensures compatibility with 5 V logic and analog rails without external trimming.
Max Output Current	1 A continuous - supports single-rail powering of microcontrollers, FPGAs, and peripheral ICs.
Dropout Voltage	2 V at 1 A, 25°C - defines minimum VIN–VOUT margin required for regulation; enables use with 7.5 V minimum input.
Line Regulation	≤50 mV (VIN = 7.5–20 V) - limits output variation due to input supply ripple or sag in upstream converters.
Load Regulation	≤50 mV (IOUT = 5 mA–1 A) - maintains tight output stability across dynamic load steps typical in digital systems.
PSRR	70 dB at 120 Hz - suppresses low-frequency switching noise from buck converters used in hybrid power architectures.
Thermal Resistance θ_JA	60°C/W (TO-220-3) - determines heatsink requirement: ~15 W max dissipation with 60°C ambient and 150°C junction limit.

Pinout & Package

AS7805AT-G1 uses the TO-220-3 package (Option 1), with standard pinout viewed from front: Pin 1 = INPUT, Pin 2 = GND, Pin 3 = OUTPUT. The metal tab is electrically connected to Pin 2 (GND), enabling direct heatsink mounting without isolation.

Pin/Terminal	Circuit Role	Design Meaning
1 (INPUT)	Voltage Input	Accepts unregulated DC input (7.5–25 V); requires ≥0.33 µF ceramic or tantalum bypass capacitor close to pin.
2 (GND)	Ground Reference	Common return path for input and output; metal tab connection enables low-impedance thermal and electrical grounding to heatsink.
3 (OUTPUT)	Voltage Output	Delivers regulated 5 V; requires ≥0.1 µF ceramic output capacitor for stability and transient response.

Key Features

Feature	Design Value
Internal Short-Circuit Protection	Limits output current to ~50 mA during sustained short - prevents catastrophic failure and enables safe auto-recovery.
Thermal Shutdown Activation	Triggers at TJ ≈ 150°C - halts regulation until junction cools below ~135°C, protecting silicon and PCB.
Safe-Area Compensation	Prevents second breakdown of output transistor under high V_CE/I_C stress - critical for reliability in transient overload conditions.
Lead-Free & RoHS Compliant	TO-220-3 package with matte tin-plated leads - meets EU RoHS 2015/863/EU and automotive change-control readiness.
Low Load Regulation	20 mV typical variation from 5 mA to 1 A load - eliminates need for post-regulator LDO in medium-current 5 V rails.

Applications

Microprocessor Power Supply

Motherboard Local Regulation

Use Scenario: Providing clean 5 V rail to legacy microcontrollers (e.g., 8051, PIC18) and FPGA configuration circuitry on embedded control boards.

IC Role / Device Role / Timing Role: Primary linear regulator delivering stable VCC with low noise and fast transient response to digital logic blocks.

Use Value: Eliminates need for external current limiting or thermal monitoring circuitry due to integrated protection features.

Use Scenario: On-board 5 V generation for USB peripherals, BIOS chips, and Super I/O controllers in industrial motherboards.

IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling main ATX or DC-DC converter outputs.

Use Value: Maintains ±4% output accuracy across –40°C to +125°C ambient, ensuring reliable boot and runtime operation.

Post-Regulation for Switching Supplies

Telecom Line Card Power

Use Scenario: Downstream filtering of 5 V output from 24 V–5 V buck converters in power management subsystems.

IC Role / Device Role / Timing Role: Low-noise linear post-regulator improving PSRR and reducing residual switching ripple to <100 µV_pp.

Use Value: 70 dB PSRR at 120 Hz suppresses fundamental ripple from 60 Hz rectified or low-frequency PWM sources.

Use Scenario: Powering analog front-end circuits (codec, SLIC interface) and management MCU in telecom line cards.

IC Role / Device Role / Timing Role: Stable 5 V source tolerant of wide input variation (e.g., 12–24 V backplane) and board-level thermal gradients.

Use Value: Thermal shutdown and safe-area protection ensure uninterrupted operation during prolonged high-temperature field deployment.

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
LM7805CDT-TR	±2% output tolerance (tighter), higher IQ (5.5–8 mA), θ_JA = 65°C/W (TO-252)	Preferred where tighter initial accuracy is required; less thermally robust in high-power density layouts.	Select when ±2% VOUT spec is mandatory and thermal headroom allows higher θ_JA.
MC7805BDTRKG	±4% tolerance, lower dropout (2 V typ), but no safe-area compensation; θ_JA = 60°C/W (TO-252)	Suitable for cost-sensitive consumer designs; lacks robustness under simultaneous high V_IN–V_OUT and high I_OUT.	Choose only if safe-area protection is not required and thermal design accommodates same θ_JA.

Compared with LM7805CDT-TR and MC7805BDTRKG, AS7805AT-G1 uniquely combines ±4% accuracy, integrated safe-area compensation, and TO-220-3 mechanical robustness-making it optimal for industrial and telecom applications demanding long-term reliability under overload stress.

Availability

AS7805AT-G1 is available at Aetrix Electronics and suitable for microprocessor power supplies, motherboard local regulation, and telecom line card power requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AS7805AT-G1 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q200.

The AS78XXA series was developed for high-reliability local regulation in industrial, telecom, and computing systems-emphasizing thermal resilience, protection integration, and lead-free/Green compliance without performance trade-offs.

FAQ

What is the maximum input voltage for AS7805AT-G1?

The absolute maximum input voltage is 36 V, but the recommended operating range is 7.5 V to 25 V per datasheet Section 4. Exceeding 25 V risks exceeding power dissipation limits at full load and may trigger thermal shutdown prematurely, especially without adequate heatsinking.

Does AS7805AT-G1 require external capacitors?

Yes: a minimum 0.33 µF ceramic or tantalum capacitor is required between INPUT and GND, and a minimum 0.1 µF ceramic capacitor between OUTPUT and GND. These stabilize regulation and improve transient response; omitting them risks oscillation or poor load step recovery.

Is the metal tab on AS7805AT-G1 electrically connected?

Yes-the metal tab is internally connected to Pin 2 (GND). This allows direct mounting to an earthed heatsink without insulating hardware, simplifying thermal design while maintaining low ground impedance for noise control.

How does AS7805AT-G1 behave under short-circuit conditions?

Under output short, the device limits current to approximately 50 mA (typical) via internal foldback protection, then activates thermal shutdown if junction temperature exceeds ~150°C. Once cooled below ~135°C, it automatically resumes regulation-no latch or manual reset required.

AS7805AT-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 25V

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

Voltage - Output (Max):: -

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

Current - Output:: 1A

Current - Quiescent (Iq):: 6 mA

Current - Supply (Max):: -

PSRR:: 70dB (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-220-3

AS7805AT-G1 FAQ

1.How can I place an order for AS7805AT-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AS7805AT-G1 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 AS7805AT-G1 reliable?

The price and inventory of AS7805AT-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS7805AT-G1 is usually 5 days.

3.What payment methods are accepted for AS7805AT-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS7805AT-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AS7805AT-G1?

AS7805AT-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AS7805AT-G1 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 AS7805AT-G1?

For technical support, including AS7805AT-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS7805AT-G1 requirements.

6.How does Aetrix verify that AS7805AT-G1 is sourced from the original manufacturer or authorized distributors?

All AS7805AT-G1 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 AS7805AT-G1 meets industry standards.

7.What is the process for return or replacement of AS7805AT-G1?

All AS7805AT-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS7805AT-G1, 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 AS7805AT-G1 part is unused and in its original packaging.

Return procedure for AS7805AT-G1:

1.Submit a request within 90 days.

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

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