STMicroelectronics L79L12ACUTR Linear Voltage Regulator

Introducing the STMicroelectronics L79L12ACUTR: Precision Linear Regulation for Demanding Applications

Engineered for reliability and performance, the STMicroelectronics L79L12ACUTR linear voltage regulator delivers precise -12V fixed output voltage with exceptional stability. Designed for modern electronics requiring compact solutions, this regulator combines robust protection features with efficient power management in a space-saving SOT-89-3 package. Whether powering industrial control systems, automotive electronics, or precision instrumentation, the L79L12ACUTR ensures optimal voltage regulation under varying load conditions.

Key Technical Specifications

Operating as a negative linear regulator, this device accepts input voltages up to -35V while maintaining a fixed -12V output. With 100mA output current capability and just 6mA quiescent current, it achieves exceptional efficiency in low-power applications. The regulator's 42dB PSRR (120Hz) ensures minimal noise interference, making it ideal for audio circuits and sensitive analog systems.

Advanced Protection Architecture

Built-in over-temperature and short-circuit protection safeguards both the regulator and connected circuitry. This dual protection system enables reliable operation in harsh environments while maintaining component longevity. The device's thermal shutdown feature automatically reduces output current during overheating conditions, preventing permanent damage during unexpected system faults.

Compact Surface-Mount Design

Housed in a TO-243AA (SOT-89-3) surface-mount package, the L79L12ACUTR offers exceptional thermal performance in minimal board space. This low-profile solution measures just 4.5mm x 2.5mm x 1.5mm, making it perfect for space-constrained applications including portable electronics, IoT devices, and wearable technology. The package's thermal pad ensures efficient heat dissipation during high-current operation.

Superior Power Management

With its low dropout voltage characteristics and excellent line/load regulation, this regulator maintains stable output voltage across varying operating conditions. The 6.5mA maximum supply current specification ensures minimal power consumption in battery-powered applications. Its high PSRR performance effectively rejects input voltage ripple, delivering clean power to downstream components.

Industrial & Automotive Applications

Engineered for mission-critical systems, the L79L12ACUTR meets stringent industrial and automotive requirements. Typical applications include:

• Industrial control systems
• Automotive sensor modules
• Medical instrumentation
• Telecom equipment
• Audio amplification circuits

The device's wide operating temperature range (-40°C to +150°C) and automotive-grade reliability make it suitable for under-the-hood automotive applications and industrial automation systems.

Design Flexibility & Compatibility

This regulator seamlessly integrates with various power supply architectures. When paired with positive voltage regulators like the LM78L series, it enables complete dual-supply solutions for operational amplifier circuits and analog-to-digital converters. The simple three-pin configuration requires minimal external components, reducing overall BOM cost and design complexity.

Environmental Compliance & Packaging

Manufactured in RoHS-compliant facilities, the L79L12ACUTR meets global environmental standards. Available in tape-and-reel packaging (TR), this regulator supports automated pick-and-place assembly processes. The moisture sensitivity level (MSL) rating ensures reliable performance during reflow soldering operations.

Performance Characteristics

Key performance metrics include:

• ±4% output voltage accuracy
• 1.2W maximum power dissipation
• 500kHz bandwidth
• 10µs response time to load transients

These specifications enable stable operation in dynamic load environments, maintaining voltage regulation during rapid current changes.

Design Considerations

For optimal performance, designers should consider:

• Proper thermal vias for heat dissipation
• Input/output capacitors with low ESR
• Short PCB traces to minimize inductance
• Adequate headroom between input and output voltages

Following these guidelines ensures maximum reliability and performance in end applications.

Technical Support & Documentation

STMicroelectronics provides comprehensive technical resources including detailed datasheets, application notes, and SPICE models. Designers can access reference designs and simulation tools through ST's online technical portal to accelerate development cycles.

Tags: L79L12ACUTR, STMicroelectronics Regulator, Negative Voltage Regulator, SOT-89-3 Package, 100mA Linear Regulator