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

STMicroelectronics L78S10CV-DG

Name: L78S10CV-DG
Brand: STMicroelectronics
SKU: L78S10CV-DG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L78S10CV-DG

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: L78S10CV-DG.pdf

Description:: IC REG LINEAR 10V 2A TO220

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Product details

Overview

L78S10CV-DG from STMicroelectronics is a three-terminal fixed-output positive voltage regulator IC delivering 10 V at up to 2 A, featuring internal current limiting, thermal shutdown, and safe operating area (SOA) protection. It operates with input voltages up to 30 V (for ≤1 A load), exhibits 17 mΩ output resistance, and maintains ±5% output voltage accuracy over temperature and load - widely deployed in industrial power supplies and local on-card regulation for microcontroller subsystems.

For engineers reviewing the L78S10CV-DG datasheet, L78S10CV-DG pinout, L78S10CV-DG application, or L78S10CV-DG equivalent, key selection criteria include dropout behavior under 2 A load, thermal resistance (5 °C/W junction-to-case), ripple rejection (47 dB at 120 Hz), and compatibility with TO-220 dual-gauge heatsinking in high-reliability 12–24 V system rails.

Technical Context

The L78S10CV-DG implements a monolithic series pass transistor architecture with embedded foldback current limiting and thermal foldback circuitry that reduces output current before junction temperature exceeds 150 °C. Its SOA protection prevents secondary breakdown during transient overload conditions.

It requires no external compensation and remains stable with or without an output capacitor; however, a 0.33 µF input and 0.1 µF output ceramic capacitor are recommended for optimal transient response and noise suppression across 10 Hz–100 kHz bandwidth.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	10 V ±5% (9.5–10.5 V at 500 mA, 25 °C); tight regulation enables direct powering of 10 V analog front-ends.
Max Output Current	2 A continuous (with adequate heatsink); supports high-current logic rails and sensor excitation circuits.
Input Voltage Range	12.5 V to 30 V (for ≤1 A); minimum 12.5 V ensures stable regulation at full load with 2.5 V dropout margin.
Load Regulation	≤150 mV (20 mA → 2 A); low drift preserves reference stability in variable-load instrumentation.
Ripple Rejection	47 dB at 120 Hz; suppresses rectified AC noise in linear power supply stages before sensitive analog blocks.
Output Resistance	17 mΩ at 1 kHz; minimizes voltage sag under dynamic load steps in motor driver bias networks.
Quiescent Current	8 mA typical; enables low-standby-power operation in always-on industrial controllers.

Pinout & Package

Supplied in TO-220 dual-gauge package (standard through-hole mounting, metal tab electrically connected to Pin 2), with integrated heatsink interface and creepage/clearance compliant for 300 V working voltage.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Input)	V_IN	Unregulated DC input; must exceed 12.5 V for full 2 A output at 10 V; connects to bulk filter capacitor.
Pin 2 (Ground)	GND / Tab	Common reference and thermal path; metal tab is electrically tied to ground - requires insulated mounting when chassis-grounded.
Pin 3 (Output)	V_OUT	Regulated 10 V output; low-impedance source for downstream logic, op-amps, or transducers.

Key Features

Feature	Design Value
Thermal shutdown activation	Junction temperature >150 °C triggers automatic current foldback - prevents permanent damage during sustained overload or poor heatsinking.
Safe operating area (SOA) protection	Monitors V_CE × I_C in real time to avoid secondary breakdown of the internal pass transistor during surge events.
No external compensation required	Internally compensated for stability with 0.33 µF input + 0.1 µF output ceramic capacitors - simplifies layout in space-constrained PCBs.
Short-circuit peak current limit	3 A peak (non-dc) capability allows brief motor startup surges or capacitor charging without latch-off.
Dropout voltage	~2.5 V at 2 A (typical); enables use with 12–15 V intermediate bus rails while maintaining 10 V output integrity.

Applications

Industrial PLC I/O Module Power

Automotive Body Control Unit (BCU)

Use Scenario: Local 10 V rail generation for isolated analog input channels and digital I/O drivers in modular PLC backplanes.

IC Role / Device Role / Timing Role: Primary fixed-voltage regulator supplying ADC references, op-amp bias, and optocoupler LEDs.

Use Value: Tight 10 V tolerance and 150 mV load regulation ensure consistent 12-bit ADC full-scale accuracy across 20–2000 mA channel loading.

Use Scenario: Powering microcontroller peripherals (CAN transceivers, LIN drivers, sensor interfaces) in 12 V automotive BCU modules.

IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from noisy battery/alternator inputs.

Use Value: 47 dB ripple rejection attenuates alternator switching noise, preventing CAN bit errors and sensor offset drift.

Test Equipment Signal Conditioning

Medical Patient Monitor Analog Front-End

Use Scenario: Stable 10 V reference for precision DACs and programmable gain amplifiers in benchtop multimeters and waveform generators.

IC Role / Device Role / Timing Role: Low-noise local regulator feeding signal chain components requiring <100 µV RMS noise floor.

Use Value: 65 µV output noise (10 Hz–100 kHz) avoids degrading ENOB in 16-bit data acquisition systems.

Use Scenario: Powering ECG amplifier stages and isolation barrier drivers in Class II patient-connected monitors.

IC Role / Device Role / Timing Role: Isolated 10 V rail derived from auxiliary DC-DC converter, meeting IEC 60601-1 creepage requirements via TO-220 mounting.

Use Value: TO-220 dual-gauge package enables reinforced insulation spacing and traceable thermal path to heatsink for safety-critical thermal management.

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
LM7810CT	Higher quiescent current (6.5 mA vs. 8 mA), lower ripple rejection (40 dB), no SOA protection.	Suitable only for non-critical 10 V rails where thermal stress is minimal and noise immunity is secondary.	Select if legacy design reuse or cost sensitivity outweighs robustness requirements.
LD1085V10	Adjustable version with external resistor divider; 3 A rating but requires two resistors and compensation cap.	Better for designs needing future voltage flexibility or tighter thermal specs (R_thJA = 40 °C/W).	Choose when board space allows adjustment components and higher current headroom is needed.

Compared with LM7810CT, L78S10CV-DG delivers superior thermal survivability and noise rejection; versus LD1085V10, it trades adjustability for simpler layout and guaranteed 10 V accuracy without calibration.

Availability

L78S10CV-DG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant TO-220 packaging.

Supply support for L78S10CV-DG 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 power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The L78S series was engineered for rugged, maintenance-free local regulation in harsh environments - emphasizing thermal resilience, fault tolerance, and drop-in replacement for legacy 78xx regulators without redesign.

FAQ

What is the minimum input voltage required for full 2 A output at 10 V?

The L78S10CV-DG requires a minimum input voltage of 12.5 V to sustain 2 A output at 10 V under typical conditions (T_J = 25 °C). At higher junction temperatures or with marginal heatsinking, ≥13.5 V is recommended to maintain regulation margin and avoid thermal foldback.

Can this regulator be used without an output capacitor?

Yes - the L78S10CV-DG is internally compensated and stable without an output capacitor. However, adding a 0.1 µF ceramic capacitor at the output significantly improves load transient response and reduces high-frequency noise, especially in systems with fast-switching digital loads.

Is the metal tab electrically connected to any pin?

Yes - the metal tab of the TO-220 dual-gauge package is internally connected to Pin 2 (Ground). When mounted to a heatsink, electrical isolation (e.g., mica washer + shoulder washer) is mandatory unless the heatsink is grounded to the same reference potential.

How does the SOA protection function differ from standard current limiting?

SOA protection continuously monitors both output current and pass transistor V_CE to prevent operation beyond the device's safe power dissipation envelope - unlike simple current foldback, it avoids destructive second breakdown during high-voltage, high-current transients such as inductive kickback or hot-plug events.

L78S10CV-DG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 35V

Voltage - Output (Min/Fixed):: 10V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 2A

Current - Quiescent (Iq):: 8 mA

Current - Supply (Max):: -

PSRR:: 47dB (120Hz)

Control Features:: -

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

Operating Temperature:: 0°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

L78S10CV-DG FAQ

1.How can I place an order for L78S10CV-DG through Aetrix?

Please submit a Request for Quotation (RFQ) for L78S10CV-DG 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 L78S10CV-DG reliable?

The price and inventory of L78S10CV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78S10CV-DG is usually 5 days.

3.What payment methods are accepted for L78S10CV-DG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78S10CV-DG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L78S10CV-DG?

L78S10CV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L78S10CV-DG 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 L78S10CV-DG?

For technical support, including L78S10CV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78S10CV-DG requirements.

6.How does Aetrix verify that L78S10CV-DG is sourced from the original manufacturer or authorized distributors?

All L78S10CV-DG 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 L78S10CV-DG meets industry standards.

7.What is the process for return or replacement of L78S10CV-DG?

All L78S10CV-DG units undergo pre-shipment inspection (PSI). If there is an issue with L78S10CV-DG, 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 L78S10CV-DG part is unused and in its original packaging.

Return procedure for L78S10CV-DG:

1.Submit a request within 90 days.

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

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