Overview
The L7805T, part of the L78 series from STMicroelectronics, is a three-terminal positive voltage regulator IC. This device is available in various packages including TO-220, TO-220FP, D²PAK, and DPAK, making it versatile for a wide range of applications. The L7805T is designed to provide local on-card regulation, which helps in eliminating the distribution problems associated with single point regulation. It features internal current limiting, thermal shutdown, and safe area protection, making it highly reliable and essentially indestructible if adequate heat sinking is provided.
The L7805T is specifically configured to deliver a fixed output voltage of 5V with an output current capability of up to 1.5 A. Although primarily designed as a fixed voltage regulator, it can also be used with external components to achieve adjustable voltage and current outputs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 5 | V |
| Output Current | Up to 1.5 A | A |
| Input Voltage (for VO = 5 to 18 V) | 35 V | V |
| Input Voltage (for VO = 20, 24 V) | 40 V | V |
| Operating Junction Temperature Range (L7805AC) | 0 to 125 °C | °C |
| Operating Junction Temperature Range (L7805AB) | -40 to 125 °C | °C |
| Thermal Resistance Junction-Case (TO-220) | 5 °C/W | °C/W |
| Thermal Resistance Junction-Ambient (TO-220) | 50 °C/W | °C/W |
| Dropout Voltage | 2 V | V |
| Output Voltage Tolerance (A version) | 2 % | % |
| Minimum Load Current for Regulation | 5 mA | mA |
Key Features
- Output current up to 1.5 A
- Fixed output voltage of 5 V
- Thermal overload protection
- Short circuit protection
- Output transition SOA protection
- 2 % output voltage tolerance (A version)
- Guaranteed in extended temperature range (A version)
- Internal current limiting and thermal shutdown
- Safe area protection
- Available in TO-220, TO-220FP, D²PAK, and DPAK packages
Applications
The L7805T is suitable for a variety of applications, including:
- Communications equipment
- Computers and peripherals
- Industrial control systems
- Power supplies and voltage regulators
- Automotive electronics
Q & A
- What is the output voltage of the L7805T?
The output voltage of the L7805T is 5 V.
- What is the maximum output current of the L7805T?
The maximum output current of the L7805T is up to 1.5 A.
- What types of protection does the L7805T offer?
The L7805T offers thermal overload protection, short circuit protection, and output transition SOA protection.
- What are the available packages for the L7805T?
The L7805T is available in TO-220, TO-220FP, D²PAK, and DPAK packages.
- What is the minimum load current required for regulation?
The minimum load current required for regulation is 5 mA.
- What is the dropout voltage of the L7805T?
The dropout voltage of the L7805T is 2 V.
- What is the thermal resistance junction-case for the TO-220 package?
The thermal resistance junction-case for the TO-220 package is 5 °C/W.
- What is the operating junction temperature range for the L7805AC version?
The operating junction temperature range for the L7805AC version is 0 to 125 °C.
- Can the L7805T be used for adjustable voltage and current outputs?
Yes, the L7805T can be used with external components to achieve adjustable voltage and current outputs.
- What are some common applications of the L7805T?
The L7805T is commonly used in communications equipment, computers and peripherals, industrial control systems, power supplies, and automotive electronics.
