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

STMicroelectronics L78S15CV-DG

Name: L78S15CV-DG
Brand: STMicroelectronics
SKU: L78S15CV-DG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L78S15CV-DG

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: L78S15CV-DG.pdf

Description:: IC REG LINEAR 15V 2A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:1,451

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Product details

Overview

L78S15CV-DG from STMicroelectronics is a three-terminal fixed-output positive voltage regulator IC delivering 15 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 150 mV load regulation at 2 A, and is housed in a TO-220 dual-gauge package for high-power local on-card regulation in industrial power supplies.

For engineers reviewing the L78S15CV-DG datasheet, L78S15CV-DG pinout, L78S15CV-DG application, or L78S15CV-DG equivalent, key selection criteria include dropout behavior under 2 A load, thermal resistance (5 °C/W junction-to-case), short-circuit peak current (3 A), and output noise (90 µV RMS, 10 Hz–100 kHz).

Technical Context

The L78S15CV-DG implements a monolithic series pass transistor architecture with built-in foldback current limiting and thermal foldback. Its SOA protection dynamically restricts power dissipation during overload by coordinating collector-emitter voltage and current limits.

It requires no external compensation for stability but benefits from an output capacitor (≥ 10 µF aluminum or ≥ 1 µF tantalum) to improve transient response. Input-to-output differential voltage directly governs power dissipation and peak output capability-e.g., at 5 V differential, peak current reaches ~2.5 A before thermal limit activation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	15 V ±0.6 V (min/max over line, load, temp); enables stable biasing of 15 V logic or analog circuitry without adjustment.
Max Output Current	2 A continuous (with adequate heatsink); supports high-current local regulation for motor drivers or LED arrays.
Line Regulation	150 mV max over VI = 20–26 V; ensures <1% output variation across typical unregulated DC bus swings.
Load Regulation	150 mV max from 20 mA to 2 A; maintains tight voltage control during dynamic load steps in embedded systems.
Quiescent Current	8 mA typical; low standby draw suitable for always-on industrial controllers.
Output Noise	90 µV RMS (10 Hz–100 kHz); compatible with noise-sensitive analog front-ends like ADC references.
Supply Rejection	46 dB at 120 Hz; suppresses ripple from rectified AC inputs in offline power supplies.
Thermal Resistance	5 °C/W junction-to-case; allows precise thermal design when mounted to heatsink per TO-220 mechanical specs.

Pinout & Package

Package: TO-220 dual-gauge (standard through-hole mounting, metal tab electrically connected to Pin 2). Thermal pad requires mechanical fastening and electrical isolation unless used as heat sink ground path.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Input)	Voltage input terminal	Accepts unregulated DC input up to 30 V; must be decoupled with ≥100 µF electrolytic capacitor near device.
Pin 2 (Ground)	Common reference node	Electrical ground for both input and output circuits; ties to heatsink if isolated mounting not used.
Pin 3 (Output)	Regulated voltage source	Delivers stable 15 V to load; requires ≥10 µF output capacitor for transient stability per datasheet Figure 17.

Key Features

Feature	Design Value
Internal SOA Protection	Prevents destruction during simultaneous high V_CE and I_C stress-enables robust operation in motor startup or capacitive load scenarios.
Thermal Shutdown	Activates at T_J ≈ 150 °C and holds output off until junction cools to ~130 °C-prevents permanent damage under sustained overload.
Short-Circuit Peak Current	3 A for brief durations (e.g., <100 ms)-supports surge-tolerant designs like solenoid drivers without external current limiting.
Dropout Voltage	~2.5 V at 2 A (T_J = 25 °C); defines minimum input headroom needed to sustain regulation under full load.
Adjustable Operation Support	Configurable as adjustable regulator (7–30 V) or constant-current source using external resistors-extends utility beyond fixed 15 V use.

Applications

Industrial Power Supply

Motor Drive Bias Rail

Use Scenario: Local regulation for microcontroller, op-amps, and gate drivers in PLC I/O modules.

IC Role / Device Role / Timing Role: Primary 15 V rail generator with fault resilience against field-induced transients.

Use Value: Eliminates long-trace distribution losses and provides independent shutdown during overtemperature events.

Use Scenario: Providing gate drive and logic supply for half-bridge MOSFET drivers in 24 V DC motor controllers.

IC Role / Device Role / Timing Role: Stable 15 V source for level-shifting and bootstrap circuitry requiring low-noise, high-current capability.

Use Value: Delivers 2 A peak current during PWM switching transitions while maintaining <150 mV droop.

Test Equipment Front-End

LED Array Driver Reference

Use Scenario: Precision analog subsystem power in bench multimeters and signal generators.

IC Role / Device Role / Timing Role: Low-noise 15 V reference for DACs and precision ADCs with <90 µV RMS noise floor.

Use Value: Enables 16-bit measurement accuracy by minimizing supply-induced code spread.

Use Scenario: Constant-voltage bias for parallel-connected high-brightness LED strings in signage systems.

IC Role / Device Role / Timing Role: Fixed 15 V source feeding external constant-current regulators (e.g., LM3405) with thermal foldback.

Use Value: Ensures consistent LED luminance across ambient temperature shifts via integrated thermal protection.

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
L7815CV	Same 15 V output, but rated for 1.5 A max and higher dropout (~2 V at 1.5 A); lacks SOA protection and has lower short-circuit peak (1.5 A).	Suitable for lower-power, cost-sensitive designs where 2 A capability and robust overload handling are unnecessary.	Select L7815CV only if thermal margin is ample and peak load currents remain below 1.5 A.
LM7815CD2TR	15 V, 1.5 A, TO-263 package; higher quiescent current (6.5 mA typ), lower PSRR (40 dB @ 120 Hz), no SOA protection.	Better suited for surface-mount layouts with moderate thermal constraints and less demanding transient loads.	Choose LM7815CD2TR when board space is limited and thermal design cannot accommodate TO-220 heatsinking.

Compared with L7815CV and LM7815CD2TR, the L78S15CV-DG uniquely delivers 2 A continuous current with SOA and thermal foldback-making it the only choice among the three for high-reliability, high-current linear regulation where fault tolerance is critical.

Availability

L78S15CV-DG is available at Aetrix Electronics and suitable for industrial power supplies, motor drive bias rails, and test equipment front-ends requiring stable component supply with full production lifecycle support.

Supply support for L78S15CV-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, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The L78S series targets high-reliability linear regulation in harsh environments-designed specifically for industrial automation, factory instrumentation, and legacy system replacements needing rugged, drop-in 15 V regulation.

FAQ

Is an input capacitor required for stable operation of L78S15CV-DG?

Yes-an input capacitor (≥100 µF aluminum or ≥10 µF tantalum) is mandatory when the regulator is located more than 10 cm from the main filter capacitor. This prevents oscillation due to source inductance and ensures reliable start-up under heavy load. The capacitor must be placed as close as possible to Pin 1 and Pin 2.

Can L78S15CV-DG be used in adjustable-output configurations?

Yes-it supports adjustable output (7–30 V) using two external resistors per Figure 20 in the datasheet, or constant-current mode per Figure 18. In adjustable mode, the ADJ pin replaces ground, and output voltage is set by V_OUT = 15 V × (1 + R2/R1). Minimum load current remains 5 mA.

What is the maximum safe input voltage for continuous 2 A operation?

At 2 A output, the maximum safe continuous input voltage is 23 V when mounted on a heatsink providing ≤10 °C/W thermal resistance. This limits junction temperature to ≤125 °C based on R_thJC = 5 °C/W and ambient ≤50 °C. Exceeding 23 V risks thermal shutdown under sustained load.

Does L78S15CV-DG require an output capacitor for stability?

No external capacitor is required for basic stability, but a ≥10 µF output capacitor (aluminum or tantalum) is strongly recommended to improve load transient response and reduce output impedance at high frequencies. Without it, step-load recovery time increases significantly, risking undershoot in sensitive analog circuits.

L78S15CV-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):: 15V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 2A

Current - Quiescent (Iq):: 8 mA

Current - Supply (Max):: -

PSRR:: 46dB (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

L78S15CV-DG FAQ

1.How can I place an order for L78S15CV-DG through Aetrix?

Please submit a Request for Quotation (RFQ) for L78S15CV-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 L78S15CV-DG reliable?

The price and inventory of L78S15CV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78S15CV-DG is usually 5 days.

3.What payment methods are accepted for L78S15CV-DG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78S15CV-DG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L78S15CV-DG?

L78S15CV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L78S15CV-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 L78S15CV-DG?

For technical support, including L78S15CV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78S15CV-DG requirements.

6.How does Aetrix verify that L78S15CV-DG is sourced from the original manufacturer or authorized distributors?

All L78S15CV-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 L78S15CV-DG meets industry standards.

7.What is the process for return or replacement of L78S15CV-DG?

All L78S15CV-DG units undergo pre-shipment inspection (PSI). If there is an issue with L78S15CV-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 L78S15CV-DG part is unused and in its original packaging.

Return procedure for L78S15CV-DG:

1.Submit a request within 90 days.

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

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