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

STMicroelectronics L78L08ACZ-AP

Name: L78L08ACZ-AP
Brand: STMicroelectronics
SKU: L78L08ACZ-AP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L78L08ACZ-AP

Manufacturer:: STMicroelectronics

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

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: L78L08ACZ-AP.pdf

Description:: IC REG LINEAR 8V 100MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,193

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Product details

Overview

L78L08ACZ-AP from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 8 V output at up to 100 mA, featuring internal current limiting, thermal overload protection, and short-circuit protection. It requires no external components, operates over 0–125 °C junction temperature, and is used for local on-card regulation in microcontroller power domains, sensor interface rails, and low-noise analog subsystems.

For engineers reviewing the L78L08ACZ-AP datasheet, L78L08ACZ-AP pinout, L78L08ACZ-AP application, or L78L08ACZ-AP equivalent, this page provides verified electrical characteristics, TO-92 package details, thermal resistance data, dropout voltage (1.7 V), and real-world use cases in embedded control and industrial sensing circuits.

Technical Context

The L78L08ACZ-AP implements a monolithic silicon voltage regulator with built-in thermal shutdown and foldback current limiting. Its architecture eliminates the need for external compensation or support capacitors beyond standard input/output bypassing (0.33 µF and 0.1 µF).

It maintains output regulation across input voltages from 10.5 V to 23 V, with line regulation ≤125 mV and load regulation ≤40 mV under specified conditions. The device achieves 37–45 dB supply voltage rejection at 120 Hz and delivers 60 µV RMS output noise (10 Hz–100 kHz).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	8.0 V ±4% (7.68–8.32 V at 25 °C); ensures stable logic-level rail for 8 V–compatible peripherals
Max Output Current	100 mA; sufficient for powering small MCUs, op-amps, or digital sensors without heatsinking
Dropout Voltage	1.7 V; enables operation from 10.5 V input while maintaining regulation at full load
Quiescent Current	6 mA at 25 °C; low static draw supports battery-backed or energy-conscious designs
Supply Rejection	37–45 dB at 120 Hz; suppresses ripple from unregulated wall adapters or switching pre-regulators
Output Noise	60 µV RMS (10 Hz–100 kHz); suitable for noise-sensitive analog front-ends and ADC references
Thermal Resistance	R_thJA = 200 °C/W (TO-92); requires minimal PCB copper area for safe 100 mA operation at ambient ≤50 °C

Pinout & Package

Supplied in TO-92 package: compact, through-hole, cost-effective plastic housing with 3 leads, rated for 0–125 °C operating junction temperature and compatible with wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	V_OUT	Regulated 8 V output; connects directly to load and local 0.1 µF ceramic bypass capacitor
Pin 2	GND	Ground reference for both input and output; must be low-impedance connection to minimize noise coupling
Pin 3	V_IN	Unregulated input (10.5–23 V); requires 0.33 µF ceramic capacitor within 1 cm of pin

Key Features

Feature	Design Value
No external components required	Enables single-chip 8 V regulation with only two recommended bypass capacitors-reduces BOM count and layout area
Internal thermal shutdown	Automatically disables output above safe junction temperature, preventing damage during sustained overload or poor heatsinking
Short-circuit protection	Current-limited foldback response limits fault current to <50 mA, protecting upstream supply and PCB traces
±4% output tolerance (A grade)	Tighter than standard ±8% (C grade), improving accuracy for precision analog or reference applications
Low output noise (60 µV)	Reduces interference in signal chains-critical for 12-bit+ ADCs and low-noise amplifiers

Applications

Industrial Sensor Node Power

Microcontroller Core Rail

Use Scenario: Powers temperature, pressure, and humidity sensors in factory-floor wireless nodes with 12–24 V DC input.

IC Role / Device Role / Timing Role: Provides clean, regulated 8 V for sensor excitation and signal conditioning circuitry.

Use Value: Eliminates need for discrete Zener/resistor regulators-reducing heat, component count, and long-term drift.

Use Scenario: Supplies 8 V to legacy 8-bit microcontrollers (e.g., PIC16F, STM8) requiring non-3.3/5 V core voltage.

IC Role / Device Role / Timing Role: Acts as primary local regulator for MCU V_DD, decoupled with 0.1 µF ceramic capacitor.

Use Value: Ensures stable clocking and I/O operation despite input ripple from shared 24 V industrial bus.

Programmable Logic Controller I/O Module

Analog Front-End Reference Rail

Use Scenario: Delivers isolated 8 V bias to optocoupler inputs and digital isolator side-rails in PLC backplane modules.

IC Role / Device Role / Timing Role: Serves as dedicated low-noise auxiliary supply for level-shifting and isolation interfaces.

Use Value: Maintains noise margin >20 dB above switching noise floor from adjacent 24 V DC-DC converters.

Use Scenario: Generates quiet 8 V reference for programmable gain instrumentation amplifiers and 16-bit SAR ADCs.

IC Role / Device Role / Timing Role: Functions as low-noise analog supply rail, separate from digital V_CC.

Use Value: Limits RMS noise contribution to <0.01% of full-scale range-enabling effective 14-bit ENOB performance.

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
MC78L08ACP	ON Semiconductor part; same 8 V output, ±4% tolerance, but higher quiescent current (7.5 mA typ.) and lower SVR (35–42 dB)	Suitable for cost-sensitive industrial controls where noise and PSRR are secondary to availability	Select when sourcing from ON Semi distribution channels or when legacy board compatibility is required
TL750L08CD	TI part; identical 8 V/100 mA rating, but tighter initial tolerance (±2%), lower noise (45 µV), and higher dropout (2.0 V)	Better for high-precision analog systems needing tighter voltage accuracy and lower noise	Choose when 0.3 V higher dropout is acceptable and sub-2% output stability is critical

Compared with MC78L08ACP and TL750L08CD, the L78L08ACZ-AP offers superior supply rejection and lower quiescent current than the ON part, while trading off some accuracy and noise performance versus the TI part-making it optimal for general-purpose industrial regulation where robustness and thermal safety are prioritized.

Availability

L78L08ACZ-AP is available at Aetrix Electronics and suitable for industrial sensor nodes, programmable logic controller I/O modules, and analog front-end reference rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant through-hole packaging.

Supply support for L78L08ACZ-AP 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with strong vertical integration and AEC-Q100/IEC 60730 certification capabilities.

The L78L series was designed specifically for cost-sensitive, space-constrained embedded applications requiring rugged, self-protected fixed-voltage regulation-targeting industrial automation, building controls, and legacy equipment upgrades.

FAQ

What is the minimum input voltage required for stable 8 V output at 100 mA?

The L78L08ACZ-AP requires a minimum input voltage of 9.7 V to maintain regulation at full 100 mA load, based on its 1.7 V dropout specification. At 25 °C with adequate PCB copper heatsinking, stable operation begins at VI ≥ 10.5 V per datasheet test conditions-below which output voltage drops linearly with input.

Can L78L08ACZ-AP replace a Zener diode + resistor network?

Yes-it directly replaces discrete Zener/resistor regulators in low-current applications. Unlike passive solutions, it provides constant 8 V output across varying load (1–100 mA) and input (10.5–23 V) conditions, with lower quiescent current (6 mA vs. typical 10–20 mA Zener bias), improved line/load regulation, and built-in fault protection.

Is a heat sink required for continuous 100 mA operation?

No external heat sink is required for continuous 100 mA operation at ambient temperatures ≤50 °C when using the TO-92 package with ≥6 cm² of 2-oz copper pour connected to Pin 2 (GND). At 70 °C ambient, derating to ~65 mA is recommended per thermal resistance data (R_thJA = 200 °C/W).

What capacitor values are mandatory for stable operation?

A 0.33 µF ceramic capacitor is required on the input (within 1 cm of Pin 3), and a 0.1 µF ceramic capacitor is required on the output (directly at Pin 1). These values are validated in ST's test circuits and prevent oscillation; tantalum or electrolytic alternatives are not recommended due to ESR-related instability risks.

L78L08ACZ-AP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 30V

Voltage - Output (Min/Fixed):: 8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 100mA

Current - Quiescent (Iq):: 5.5 mA

Current - Supply (Max):: 6 mA

PSRR:: 45dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

L78L08ACZ-AP FAQ

1.How can I place an order for L78L08ACZ-AP through Aetrix?

Please submit a Request for Quotation (RFQ) for L78L08ACZ-AP 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 L78L08ACZ-AP reliable?

The price and inventory of L78L08ACZ-AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78L08ACZ-AP is usually 5 days.

3.What payment methods are accepted for L78L08ACZ-AP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78L08ACZ-AP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L78L08ACZ-AP?

L78L08ACZ-AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L78L08ACZ-AP 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 L78L08ACZ-AP?

For technical support, including L78L08ACZ-AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78L08ACZ-AP requirements.

6.How does Aetrix verify that L78L08ACZ-AP is sourced from the original manufacturer or authorized distributors?

All L78L08ACZ-AP 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 L78L08ACZ-AP meets industry standards.

7.What is the process for return or replacement of L78L08ACZ-AP?

All L78L08ACZ-AP units undergo pre-shipment inspection (PSI). If there is an issue with L78L08ACZ-AP, 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 L78L08ACZ-AP part is unused and in its original packaging.

Return procedure for L78L08ACZ-AP:

1.Submit a request within 90 days.

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

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