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

onsemi MC78L08ACPRE

Name: MC78L08ACPRE
Brand: onsemi
SKU: MC78L08ACPRE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC78L08ACPRE

Manufacturer:: onsemi

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

Package:: TO-226-3, TO-92-3 Long Body, Formed Leads

Datasheet:: MC78L08ACPRE.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,110

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Product details

Overview

MC78L08ACPRE from onsemi is a 100 mA, fixed +8.0 V positive linear voltage regulator in TO-92 package, featuring internal short-circuit current limiting, thermal shutdown, and dropout voltage of 1.7 V at 25°C. It operates over 0°C to +125°C junction temperature and requires no external components for basic regulation in low-power embedded systems, sensor interfaces, and industrial control modules.

For engineers reviewing the MC78L08ACPRE datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs (VO = 7.7–8.3 V, RR = 37–57 dB, Regload ≤ 80 mV), thermal resistance (R_JA = 200°C/W), and real-world design context for stable 8 V supply generation in cost-sensitive, space-constrained applications.

Technical Context

The MC78L08ACPRE implements a monolithic series-pass transistor regulator with built-in protection circuitry: thermal overload shutdown activates at ~150°C junction temperature, and current limiting caps output at ~150 mA typical. Its architecture eliminates need for external compensation capacitors in most <100 mA loads.

It is designed for fixed-output operation only - no adjustment pin or feedback network - and exhibits line regulation of ≤125 mV over 11–23 V input range and load regulation of ≤40 mV across 1–40 mA output current at 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	7.7–8.3 V at 25°C; ensures stable 8 V rail within ±3.75% tolerance under nominal conditions
Max Output Current	100 mA continuous; supports low-power microcontrollers, op-amps, and logic ICs without derating
Dropout Voltage	1.7 V typical at 25°C; requires minimum 9.7 V input to sustain 8 V output at full load
Ripple Rejection	37–57 dB at 120 Hz; suppresses AC ripple from unregulated DC supplies by >50×
Thermal Resistance	200°C/W (TO-92); limits power dissipation to 625 mW at 25°C ambient before thermal shutdown
Operating Temp	0°C to +125°C junction; validated for commercial/industrial environments, not automotive-grade
Input Voltage Range	10.5–23 V DC; compatible with 12 V nominal systems including battery-backed and rectified AC inputs

Pinout & Package

MC78L08ACPRE uses TO-92 package (Case 029), with 3 leads: Pin 1 = Output (V_OUT), Pin 2 = Ground (GND), Pin 3 = Input (V_IN). The plastic case provides electrical isolation; tab is not internally connected.

Pin/Terminal	Circuit Role	Design Meaning
1	V_OUT	Regulated +8.0 V output; connects directly to load and local bypass capacitor (0.1 µF)
2	GND	Common reference for input and output; must share low-impedance ground plane with filter capacitors
3	V_IN	Unregulated DC input; requires ≥9.7 V minimum and 0.33 µF bypass capacitor if >5 cm from source

Key Features

Feature	Design Value
Internal Short-Circuit Protection	Limits output current to ~150 mA to prevent damage during accidental load shorts
Thermal Shutdown	Disables output when junction temperature exceeds ~150°C, enabling safe auto-recovery
No External Components Required	Stable regulation achieved with only input (0.33 µF) and output (0.1 µF) capacitors in standard configurations
Pb-Free TO-92 Package	RoHS-compliant lead finish and plastic body; compatible with standard through-hole reflow and wave soldering
Low Quiescent Current	Typical I_IB = 3.0 mA at 25°C; minimizes standby power loss in battery-powered systems

Applications

Industrial Sensor Interface	Microcontroller Power Supply
Use Scenario: Powering analog temperature/humidity sensors (e.g., HTU21D) in factory-floor monitoring nodes. IC Role / Device Role / Timing Role: Provides clean, noise-immune 8 V bias for sensor excitation and signal conditioning circuitry. Use Value: Ripple rejection >37 dB ensures <10 mV AC noise on sensor supply, preserving 12-bit ADC accuracy.	Use Scenario: Supplying 8 V to legacy 8-bit MCUs (e.g., PIC16F series) operating from 12 V intermediate bus. IC Role / Device Role / Timing Role: Delivers regulated V_DD rail with fast transient response (<10 µs recovery) for clocked digital logic. Use Value: Load regulation ≤40 mV maintains stable core voltage across 1–40 mA dynamic current swings.
Programmable Logic Controller (PLC) I/O Module	Legacy Industrial Instrumentation
Use Scenario: Powering opto-isolated digital input circuits in DIN-rail mounted PLC backplanes. IC Role / Device Role / Timing Role: Supplies isolated 8 V for LED drivers in 24 V DC input interface stages. Use Value: Dropout of 1.7 V allows reliable operation even with 20% input sag (down to 9.7 V) on noisy plant-floor rails.	Use Scenario: Replacing aging 7808 regulators in analog panel meters and process controllers. IC Role / Device Role / Timing Role: Direct drop-in replacement for obsolete metal-can 78L08 variants with identical pinout and thermal profile. Use Value: TO-92 footprint and 200°C/W R_JA enable direct PCB substitution without heatsink redesign.

Industrial Sensor Interface

Microcontroller Power Supply

Use Scenario: Powering analog temperature/humidity sensors (e.g., HTU21D) in factory-floor monitoring nodes.

IC Role / Device Role / Timing Role: Provides clean, noise-immune 8 V bias for sensor excitation and signal conditioning circuitry.

Use Value: Ripple rejection >37 dB ensures <10 mV AC noise on sensor supply, preserving 12-bit ADC accuracy.

Use Scenario: Supplying 8 V to legacy 8-bit MCUs (e.g., PIC16F series) operating from 12 V intermediate bus.

IC Role / Device Role / Timing Role: Delivers regulated V_DD rail with fast transient response (<10 µs recovery) for clocked digital logic.

Use Value: Load regulation ≤40 mV maintains stable core voltage across 1–40 mA dynamic current swings.

Programmable Logic Controller (PLC) I/O Module

Legacy Industrial Instrumentation

Use Scenario: Powering opto-isolated digital input circuits in DIN-rail mounted PLC backplanes.

IC Role / Device Role / Timing Role: Supplies isolated 8 V for LED drivers in 24 V DC input interface stages.

Use Value: Dropout of 1.7 V allows reliable operation even with 20% input sag (down to 9.7 V) on noisy plant-floor rails.

Use Scenario: Replacing aging 7808 regulators in analog panel meters and process controllers.

IC Role / Device Role / Timing Role: Direct drop-in replacement for obsolete metal-can 78L08 variants with identical pinout and thermal profile.

Use Value: TO-92 footprint and 200°C/W R_JA enable direct PCB substitution without heatsink redesign.

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
MC78L08ACPREG	Same die, identical electrical specs, TO-92 package, tape-and-reel packaging (2000 pcs)	No functional difference; differs only in packaging format and reel orientation	Select MC78L08ACPREG for automated SMT placement; MC78L08ACPRE is bag-packed for manual/hand-solder assembly
LM78L08ACZ	±5% output tolerance (7.6–8.4 V), higher quiescent current (5.5 mA max), same TO-92 package	Suitable for non-critical 8 V rails where tighter VO tolerance is not required	Choose LM78L08ACZ only if board-level calibration compensates for wider output spread and higher I_IB

Compared with MC78L08ACPREG, MC78L08ACPRE offers identical regulation performance but in bulk bag packaging for prototyping and low-volume production; versus LM78L08ACZ, it delivers tighter output voltage (±3.75% vs ±5%) and lower bias current - critical for battery life and precision analog subsystems.

Availability

MC78L08ACPRE is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller power supplies, PLC I/O modules, and legacy instrumentation requiring stable component supply with long-term continuity.

Supply support for MC78L08ACPRE 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC78L00A Series - including MC78L08ACPRE - was engineered for cost-sensitive, low-current linear regulation in commercial and industrial equipment where simplicity, reliability, and Pb-free compliance are essential.

FAQ

What is the maximum input voltage rating for MC78L08ACPRE?

The absolute maximum input voltage for MC78L08ACPRE is 35 V DC for 12–18 V nominal input versions. Exceeding this risks permanent damage due to internal junction breakdown. For reliable operation, maintain input between 10.5 V and 23 V per datasheet specifications - sufficient for 12 V systems with ripple and sag.

Does MC78L08ACPRE require input and output capacitors?

Yes - MC78L08ACPRE requires a 0.33 µF input capacitor (tantalum or ceramic) placed close to Pin 3 (V_IN) to ensure stability under high-frequency noise, and a 0.1 µF output capacitor (ceramic) at Pin 1 (V_OUT) to improve transient response. Omitting either may cause oscillation or poor load-step recovery.

Can MC78L08ACPRE be used in automotive applications?

No - MC78L08ACPRE is rated for 0°C to +125°C junction temperature and lacks AEC-Q100 qualification. For automotive use, select NCV78L08ABDR2G (−40°C to +125°C, AEC-Q100 qualified) instead. MC78L08ACPRE is intended for commercial/industrial environments only.

What is the thermal resistance and power dissipation limit of MC78L08ACPRE?

MC78L08ACPRE in TO-92 package has θ_JA = 200°C/W. At 25°C ambient, its maximum power dissipation is 625 mW. With 12 V input and 8 V output at 100 mA, power dissipation is (12 − 8) × 0.1 = 400 mW - safely within limit. Derate linearly above 25°C ambient per Figure 7.

Is MC78L08ACPRE pin-compatible with other 78Lxx regulators?

Yes - MC78L08ACPRE shares identical TO-92 pinout (Pin 1 = V_OUT, Pin 2 = GND, Pin 3 = V_IN) with all MC78LxxAC/AB variants (e.g., MC78L05ACPRE, MC78L12ACPRE). This enables direct voltage-scaling substitutions on existing PCBs without layout changes, provided input/output voltage margins and thermal design remain valid.

MC78L08ACPRE Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body, Formed Leads

Packaging:: Tape & Reel (TR)

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):: 6 mA

Current - Supply (Max):: -

PSRR:: 57dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

MC78L08ACPRE FAQ

1.How can I place an order for MC78L08ACPRE through Aetrix?

Please submit a Request for Quotation (RFQ) for MC78L08ACPRE 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 MC78L08ACPRE reliable?

The price and inventory of MC78L08ACPRE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L08ACPRE is usually 5 days.

3.What payment methods are accepted for MC78L08ACPRE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L08ACPRE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC78L08ACPRE?

MC78L08ACPRE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC78L08ACPRE 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 MC78L08ACPRE?

For technical support, including MC78L08ACPRE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L08ACPRE requirements.

6.How does Aetrix verify that MC78L08ACPRE is sourced from the original manufacturer or authorized distributors?

All MC78L08ACPRE 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 MC78L08ACPRE meets industry standards.

7.What is the process for return or replacement of MC78L08ACPRE?

All MC78L08ACPRE units undergo pre-shipment inspection (PSI). If there is an issue with MC78L08ACPRE, 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 MC78L08ACPRE part is unused and in its original packaging.

Return procedure for MC78L08ACPRE:

1.Submit a request within 90 days.

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

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