Overview
The L78L33ACD is a three-terminal positive voltage regulator from STMicroelectronics. This component is part of the L78L series, which is known for its robustness and reliability. Although the L78L33ACD is currently obsolete and no longer manufactured, it remains an important reference for understanding the capabilities and specifications of similar voltage regulators in the L78L series.
The L78L series regulators are designed to provide fixed output voltages and are suitable for a wide range of applications, including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25°C | 3.168 | 3.3 | 3.432 | V |
| Output Voltage (VO) | IO = 1 to 40 mA, VI = 5.3 to 20 V | 3.135 | 3.3 | 3.465 | V |
| Line Regulation (∆VO) | VI = 5.4 to 20 V, TJ = 25°C | - | - | 150 mV | mV |
| Load Regulation (∆VO) | IO = 1 to 100 mA, TJ = 25°C | - | - | 60 mV | mV |
| Quiescent Current (Id) | TJ = 25°C | - | 6 mA | - | mA |
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25°C | - | - | 70 µV | µV |
| Supply Voltage Rejection (SVR) | VI = 12 to 23 V, f = 120 Hz, IO = 40 mA, TJ = 25°C | - | - | 37 to 44 dB | dB |
| Dropout Voltage (Vd) | - | - | 1.7 V | V |
Key Features
- Internal current limiting and thermal shutdown, making the regulator essentially indestructible.
- No external components required for operation.
- Available in various output voltages: 3.3, 5, 6, 8, 9, 10, 12, 15, 18, 24 V.
- Low quiescent current and low noise.
- Can be used as a replacement for Zener diode/resistor combinations.
- Available in TO-92, SO-8, and SOT-89 packages.
Applications
- Local or on-card voltage regulation to eliminate noise and distribution problems.
- Use with power pass elements to create high-current voltage regulators.
- Replacement for Zener diode/resistor combinations in various circuits.
- General-purpose voltage regulation in electronic devices.
Q & A
- What is the maximum output current of the L78L33ACD?
The maximum output current is up to 100 mA.
- What are the available output voltages for the L78L series?
The L78L series is available in output voltages of 3.3, 5, 6, 8, 9, 10, 12, 15, 18, and 24 V.
- Does the L78L33ACD require external components for operation?
No, the L78L33ACD does not require external components for operation.
- What is the quiescent current of the L78L33ACD at 25°C?
The quiescent current is 6 mA at 25°C.
- What is the dropout voltage of the L78L33ACD?
The dropout voltage is 1.7 V.
- What are the typical applications of the L78L series?
Typical applications include local or on-card voltage regulation, high-current voltage regulators, and replacement for Zener diode/resistor combinations.
- What are the available packages for the L78L series?
The L78L series is available in TO-92, SO-8, and SOT-89 packages.
- Is the L78L33ACD still in production?
No, the L78L33ACD is obsolete and no longer manufactured.
- What is the operating junction temperature range for the L78L33ACD?
The operating junction temperature range is 0 to 125°C.
- What is the supply voltage rejection of the L78L33ACD?
The supply voltage rejection is 37 to 44 dB at 120 Hz.
