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L78L08ACZ

100mA LDO, 8V fixed, TO-92

11400

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Pieza del fabricante：

L78L08ACZ

Paquete：

TO-92 (5.20 x 4.20 mm, through-hole)

Marca：

Categorías de productos：

Circuitos integrados IC, Reguladores de baja caída (LDO)

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Descripción

L78L08ACZ Overview

The L78L08ACZ is a positive voltage linear regulator from STMicroelectronics with fixed 8V output, maximum 100mA output current, in a TO-92 through-hole package, suitable for low-power analog circuit power supply.

Key Features

Fixed output voltage: 8V
Maximum output current: 100mA
Maximum input voltage: 30V
Dropout voltage: 1.7V
Line regulation: 200mV
Load regulation: 100mV

Introducción del producto:L78L08ACZ Presentación del producto

The L78L08ACZ is a 100 mA positive voltage regulator from STMicroelectronics in a TO-92 through-hole package, providing a fixed 8 V output with 4 percent tolerance over the 0 C to 125 C temperature range. It features internal current limiting and thermal shutdown for robustness, requires no external components, and operates from an input voltage of 10 V to 30 V. With a quiescent current of 3 mA typical and output noise voltage of 40 uV typical, it serves as a compact and reliable local regulation solution for low-current analog and logic circuits.

Principio de funcionamiento:L78L08ACZ Principio de funcionamiento

The L78L08ACZ is a series-pass linear voltage regulator that maintains a constant 8 V output by continuously adjusting the conduction of an internal series pass transistor. A bandgap voltage reference generates a stable internal reference voltage, which is compared against a divided-down sample of the output voltage by an error amplifier. The error amplifier drives the base of the series pass transistor to maintain the output at the regulation setpoint. If the output current exceeds the internal limit (typically 140 mA), the current limit circuit reduces the drive to the pass transistor, preventing damage. If the junction temperature exceeds approximately 150 C, the thermal shutdown circuit turns off the pass transistor until the device cools below the recovery threshold. The dropout voltage is approximately 1.7 V at full load (100 mA), meaning the input must be at least 9.7 V to maintain 8 V regulation. A small bypass capacitor (0.33 uF) on the input is recommended when the regulator is located far from the supply filter, and a 0.01 uF output capacitor improves transient response.

Descripción de la clavija:L78L08ACZ Definición y funciones de las clavijas

Pin	Nombre	Descripción
1	OUT	Regulated 8 V output; connect 0.01 uF capacitor to GND for stability
2	GND	Referencia del suelo
3	EN	Unregulated input voltage (10 V to 30 V); connect 0.33 uF capacitor to GND if far from source

Package: TO-92 (3-pin, flat face). Dimensions: 4.58 x 3.86 mm body. The A suffix denotes 4% output voltage tolerance. The C suffix denotes 0 to 125 C operating temperature range. The Z suffix denotes TO-92 package.

Application Scenarios:In which products and applications isL78L08ACZ usado

Local Board Regulation: Providing a stable 8 V rail from a 12 V or 15 V supply for analog circuits and op-amp power
Zener Replacement: Replacing Zener diode-resistor combinations with better regulation and lower noise
Logic Supply: Powering 8 V logic families and relay driver circuits from unregulated DC sources
Sensor Biasing: Stable reference voltage supply for resistive sensor bridges and transducer excitation
Prototype and Hobby Projects: Simple through-hole 8 V regulator for breadboard and educational circuits

Alternative Models:What chips are recommended as replacements for L78L08ACZ

Modelo	Fabricante	Vout	Iout	Tolerance	Paquete
78L08ACZ	onsemi	8 V	100 mA	4%	TO-92
MC78L08ACPG	onsemi	8 V	100 mA	4%	TO-92
L78L08ABD13TR	STMicroelectronics	8 V	100 mA	4%	SO-8
L78L08ABUTR	STMicroelectronics	8 V	100 mA	4%	SOT-89
LM2931AZ-8.0	Texas Instruments	8 V	100 mA	4%	TO-92

L78L08ACZ is an 8V/100mA positive voltage regulator from ST in TO-92-3 with ±4% tolerance. The MC78L08ACDR2G from onsemi is the SOIC-8 surface-mount equivalent. LM78L08ACZ from TI provides the same function with ±4% A-grade tolerance. For adjustable 100mA output, LM317LZ offers 1.25-37V in the same TO-92 package. For higher current, LM7808CT provides 1A in TO-220. For low-dropout, TLV70008 provides 300mA LDO in SOT-23-5.