What is the main function of this part?

This part is used in electronic circuits for signal control, power management, industrial equipment, consumer electronics, and related applications.

Is the datasheet available for this product?

Yes, you can check the datasheet link on this product page or contact our sales team for technical documents.

Can I request a quotation for bulk quantity?

Yes, you can submit the RFQ form on this page. Our sales team will reply with current stock, price, lead time, and delivery information.

My 7805 is outputting only 3V instead of 5V - what is wrong?

Missing capacitors or input below 7V. Add 0.33uF on input and 0.1uF on output.

Why does my 7805 get extremely hot powering Arduino?

Linear regulator heat: P = (Vin - Vout) x I. At 12V and 200mA that is 1.4W. Needs heatsink above 0.3W.

Can I power an ESP32 from 7805 with 12V input?

Not recommended. ESP32 draws 500mA WiFi bursts - 3.5W dissipation overheats the 7805. Use a buck converter.

What capacitors does a 7805 need?

0.33uF ceramic on input, 0.1uF ceramic on output. Add 10-100uF electrolytic for better performance.

What is the minimum input voltage for 7805?

About 7V. It needs 2V dropout. Below 7V the output drops below 5V.

My 7805 output equals input voltage - why?

The regulator has failed short-circuit. Caused by overvoltage, reverse polarity, or thermal stress. Replace it.

Can I use 7805 with 24V input?

Electrically yes but every 100mA is 1.9W of heat. A buck converter is recommended for 24V.

Are 7805s from eBay reliable?

Counterfeit parts are common on online marketplaces. Buy from ICMASS or other verified sources.

ICMASS.COM - Global Electronic Component Solutions Provider

Name: LM7805L-TA3-T
Brand: Quantic UTC
SKU: LM7805L-TA3-T
Availability: InStock

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Quantic UTC LM7805L-TA3-T

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Part No.:: LM7805L-TA3-T

Manufacturer:: Quantic UTC

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

Package:: TO-220-3

Description:: IC REG LINEAR FIXED POS STD REG

Quantity:: Add To Cart Add To RFQ list

Unit Price:$0

Ext Price:$0

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LM7805L-TA3-T Information

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Product attributes: Attribute value

Manufacturer:: Quantic UTC

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

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):: 8 mA

Current - Supply (Max):: -

PSRR:: 73dB (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

LM7805L-TA3-T Datasheet, Price, Alternatives & FAQ — ICMASS

LM7805L-TA3-T — 5V Fixed Positive Voltage Regulator, 1A, TO-220

The LM7805L-TA3-T is a fixed 5V positive voltage regulator from UTC (友顺) in a TO-220 package. 1A output current, 35V maximum input voltage, 2V dropout. Thermal shutdown, over-current protection, and SOA protection built in.

It is the classic 7805 — the same design that has been in production for decades. The TO-220 package bolts onto a heatsink, making it practical when you need to dissipate several watts. The 35V input rating handles 12V, 24V, and even 30V rails.

One thing to know upfront: it is NOT a low-dropout regulator. It needs at least 7V input for a regulated 5V output.

What Is LM7805L-TA3-T and How Does It Work?

It is a linear voltage regulator. You feed it a DC voltage between 7V and 35V on the input pin, and it outputs a stable 5V. The difference between input and output is burned off as heat.

The 7805 is not an LDO. It needs 2V headroom — 7V input minimum for 5V output. It includes over-current protection and thermal shutdown (150°C junction).

What Are the Specifications of LM7805L-TA3-T?

Parameter	Value	Notes
Output Voltage	5.0 V (fixed)	±4% tolerance
Max Output Current	1 A	With adequate heatsinking
Input Voltage Range	7V – 35V	Below 7V loses regulation
Dropout Voltage	2 V (typ)	Needs 7V min input
Thermal Shutdown	Yes	~150°C junction
Package	TO-220	3-pin, tab = GND

What Is LM7805L-TA3-T Used For?

Industrial Control: 24V to 5V for logic circuits. TO-220 with heatsink handles the heat.

Arduino/MCU Power: Many Arduino boards use a 7805 for the 5V rail from 7–12V input.

General 5V Rail: Anywhere you have a 12V–24V supply and need a simple 5V rail.

What Are the Alternatives to LM7805L-TA3-T?

Part	Manufacturer	Current	Dropout	Max Vin	Notes
LM7805L-TA3-T	UTC	1A	2V	35V	Reference
L7805CV	ST	1.5A	2V	35V	Higher current
AMS1117-5.0	AMS	1A	1.3V	15V	LDO, SOT-223

How to Verify Genuine LM7805L-TA3-T?

Output voltage test: Apply 12V to input. Should read 4.8V–5.2V.

Dropout test: Reduce input voltage slowly. Regulation should hold until about 7V.

Frequently Asked Questions About LM7805L-TA3-T

Q1: My 7805 is outputting only 3V or 0.6V instead of 5V — what is wrong?

A: Most likely missing input/output capacitors. The 7805 can oscillate without proper decoupling, causing strange output voltages. Add a 0.33µF ceramic on input and 0.1µF on output. Also check input voltage is above 7V. Source: Arduino Forum, EEVblog.

Q2: Why does my 7805 get extremely hot when powering my Arduino?

A: P = (Vin - Vout) x I. At 12V input and 200mA load, dissipation is 1.4W. Without a heatsink it can only handle about 0.3W. It will burn your finger and may hit thermal shutdown. Use lower input voltage (7.5–9V) or add a heatsink. Source: Arduino Forum, Adafruit Forum.

Q3: Can I power an ESP32 from a 7805 with 12V input?

A: Users have reported this fails because the ESP32 draws 500mA during WiFi bursts. At 12V to 5V with 500mA, dissipation is 3.5W. The 7805 overheats and shuts down, causing the ESP32 to brown out. Use a buck converter instead. Source: Arduino Forum.

Q4: What capacitors do I need for a 7805?

A: Minimum: 0.33µF ceramic on input and 0.1µF ceramic on output, placed close to the pins. For better performance add 10–100µF electrolytic caps in parallel. Without them the regulator can oscillate. Source: AllAboutCircuits Forum, Electronics StackExchange.

Q5: Does the 7805 need a heatsink?

A: Yes above 1W. At 12V to 5V and 150mA (1.05W) it is warm but OK without. At 200mA (1.4W), it needs one. The tab is GND — bolt directly to a metal enclosure. Source: Arduino Forum, Adafruit Forum.

Q6: What is the minimum input voltage for a 7805 to output stable 5V?

A: About 7V. The 7805 needs approximately 2V dropout. Below 7V, output drops below 5V or becomes unstable. Common with wall-wart supplies that sag under load. Source: CircuitLab Forum.

Q7: My 7805 failed and output voltage equals input voltage — why?

A: The regulator has failed short-circuit internally. Caused by exceeding 35V input, reverse voltage, or thermal stress. Replace it immediately. Source: EEVblog Forum.

Q8: Can I use a 7805 with 24V input?

A: Electrically yes, but every 100mA is 1.9W of heat. Without a large heatsink it hits thermal shutdown. A buck converter is recommended for 24V. Source: Arduino Forum.

Q9: Are 7805s from eBay/AliExpress reliable?

A: Users report frequent counterfeit parts from online marketplaces — wrong output voltage, higher dropout, failure under load. Buy from ICMASS or other verified sources. Source: Electronics StackExchange, EEVblog.

Pricing & Availability

Quantity	Price per unit (USD)
1+	$0.21
50+	$0.15
150+	$0.13
500+	$0.11
2000+	$0.10

Image
Part Number	LM7805L-TA3-T
Manufacturer	Quantic UTC
Series	-
Package/Case	TO-220-3
Packaging	Tube
Product Status	Active
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)	8 mA
Current - Supply (Max)	-
PSRR	73dB (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

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