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

STMicroelectronics L79L15ACZ-TR

Name: L79L15ACZ-TR
Brand: STMicroelectronics
SKU: L79L15ACZ-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L79L15ACZ-TR

Manufacturer:: STMicroelectronics

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

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

Datasheet:: L79L15ACZ-TR.pdf

Description:: IC REG LINEAR -15V 100MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,997

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Product details

Overview

L79L15ACZ-TR from STMicroelectronics is a three-terminal fixed negative voltage regulator delivering -15 V output at up to 100 mA, featuring internal current limiting, thermal overload protection, and short-circuit protection. It requires no external components and is designed for local on-card regulation in industrial control, instrumentation, and embedded power subsystems where noise-sensitive analog circuitry demands stable, low-noise bias.

For engineers reviewing the L79L15ACZ-TR datasheet, L79L15ACZ-TR pinout, L79L15ACZ-TR application, or L79L15ACZ-TR equivalent, key selection criteria include its ±5% output tolerance (AC grade), 1.7 V dropout voltage, 90 µV RMS output noise (10 Hz–100 kHz), 34–39 dB supply voltage rejection at 120 Hz, and TO-92 package thermal resistance of 200 °C/W.

Technical Context

This device operates as a monolithic silicon negative linear regulator with built-in thermal shutdown and foldback current limiting. Its architecture eliminates need for external compensation or bypass capacitors beyond standard input/output decoupling (CI = 0.33 µF, CO = 0.1 µF).

It maintains regulation over input voltages from -17.5 V to -30 V and load currents from 1 mA to 100 mA, with output voltage stability specified across junction temperatures from 0 °C to 125 °C (AC grade) and line/load regulation tightly controlled at ≤300 mV and ≤150 mV respectively.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	-15 V ±5% (±0.75 V) at 25 °C; maintains -14.25 V to -15.75 V across 1–70 mA load and -17.5 V to -30 V input
Max Output Current	100 mA continuous - sufficient for powering op-amp rails, sensor interfaces, and microcontroller analog sections
Dropout Voltage	1.7 V - enables operation with minimal headroom; e.g., functional with -16.7 V input at full 100 mA load
Output Noise	90 µV RMS (10 Hz–100 kHz) - supports precision analog signal chains without added filtering
SVR @ 120 Hz	34–39 dB - suppresses ripple from rectified AC supplies or switching pre-regulators
Quiescent Current	6.5 mA at 25 °C - low static draw suitable for battery-backed or energy-conscious systems
Thermal Resistance	200 °C/W (junction-to-ambient, TO-92) - requires PCB copper area or heatsinking for sustained 100 mA operation

Pinout & Package

Package: TO-92 - compact through-hole plastic package with 3 leads, optimized for cost-sensitive, low-power linear regulation applications. Pin assignment verified per STMicroelectronics mechanical drawing 0102782/C.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	GND	Reference node for output voltage; connects internally to die substrate and must be tied to system ground plane
Pin 2	VIN	Negative input terminal - accepts unregulated negative DC input (e.g., -17.5 V to -30 V)
Pin 3	VOUT	Regulated negative output - delivers stable -15 V to load; requires 0.1 µF ceramic capacitor to ground for stability

Key Features

Feature	Design Value
Fixed -15 V output	Eliminates need for external feedback resistors; simplifies layout and improves long-term voltage accuracy vs. adjustable regulators
Internal thermal shutdown	Prevents catastrophic failure during overload or poor heatsinking - automatically recovers when junction cools
No external components required	Reduces BOM count and board space; only CI (0.33 µF) and CO (0.1 µF) recommended for transient immunity and stability
±5% output tolerance (AC grade)	Meets tighter specification than ±10% (C grade); suitable for applications requiring higher initial accuracy without calibration
Low quiescent current drift	ΔId ≤ 0.1 mA over 1–40 mA load range - ensures predictable standby power in always-on subsystems

Applications

Industrial Sensor Interface

Legacy Analog Instrumentation

Use Scenario: Powering dual-supply op-amps and precision ADC drivers in 4–20 mA loop-powered transmitters.

IC Role / Device Role / Timing Role: Negative rail generator providing clean, regulated -15 V for analog front-end biasing.

Use Value: Replaces Zener/resistor networks with two-order-of-magnitude lower output impedance and 90 µV noise floor.

Use Scenario: Retrofitting aging panel meters and analog chart recorders requiring stable dual-rail supplies.

IC Role / Device Role / Timing Role: Fixed negative voltage source replacing obsolete discrete regulator modules.

Use Value: Enables drop-in replacement with improved thermal robustness and no external component redesign.

Embedded Control Board Bias

Test & Measurement Signal Conditioning

Use Scenario: Local regulation for microcontroller analog peripherals (DACs, comparators, reference buffers) on dense PCBs.

IC Role / Device Role / Timing Role: On-card negative regulator minimizing noise coupling from shared system rails.

Use Value: Delivers 100 mA at 1.7 V dropout while maintaining <150 mV load regulation error across full current range.

Use Scenario: Supplying low-noise bias to differential amplifiers and active filters in benchtop oscilloscopes and spectrum analyzers.

IC Role / Device Role / Timing Role: Low-noise negative rail generator supporting high-dynamic-range signal paths.

Use Value: Provides 34–39 dB SVR and 90 µV RMS noise - critical for preserving SNR in sub-mV-level measurements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar negative fixed-voltage regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM337IMPX/NOPB	Adjustable output (−1.25 V to −37 V); requires two external resistors; higher quiescent current (5 mA typ)	Used where programmability or tighter tolerance (±1%) is needed; less suitable for space-constrained fixed-VOUT designs	Select if output voltage flexibility or better initial accuracy outweighs simplicity and footprint advantages of L79L15ACZ-TR
MC7915CTG	TO-220 package; 1.5 A output capability; higher thermal mass; 2.0 V dropout; ±2% tolerance option available	Preferred in high-current or high-temperature environments where TO-92 thermal limits are exceeded	Choose when >100 mA load or >70 °C ambient operation necessitates larger package and higher power dissipation margin

Compared with LM337IMPX/NOPB and MC7915CTG, the L79L15ACZ-TR offers lowest component count, smallest footprint, and best noise performance for low-current fixed -15 V applications - but lacks adjustability and high-current capability.

Availability

L79L15ACZ-TR is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy instrumentation retrofits, embedded control board biasing, and test & measurement signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for L79L15ACZ-TR 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The L79L00 series belongs to ST's legacy linear regulator product line, engineered specifically for cost-effective, robust, fixed-output negative voltage regulation in space- and reliability-constrained embedded systems.

FAQ

What is the minimum input voltage required for L79L15ACZ-TR to maintain regulation at full load?

The device requires a minimum input voltage of -17.5 V to sustain -15 V output at 100 mA load, based on its 1.7 V dropout specification. Operation below this threshold results in loss of regulation and output voltage collapse proportional to input reduction.

Can L79L15ACZ-TR be used in parallel to increase output current?

No - the L79L15ACZ-TR lacks current-sharing features and is not designed for parallel operation. Attempting to parallel units risks thermal runaway due to mismatched output voltages and unbalanced current distribution; use a single higher-current regulator instead.

Is an input capacitor mandatory for stable operation?

While not strictly mandatory for basic regulation, a 0.33 µF ceramic input capacitor is strongly recommended per ST's test circuits to suppress high-frequency noise and prevent oscillation under dynamic load conditions - especially when input traces are long or sourced from switching supplies.

Does L79L15ACZ-TR support operation below 0 °C?

No - the AC grade (L79L15ACZ-TR) is rated for 0 °C to +125 °C junction temperature only. For sub-zero operation down to -40 °C, the AB-grade variant L79L15ABZ-TR must be selected, which is characterized across the extended industrial temperature range.

L79L15ACZ-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Negative

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: -35V

Voltage - Output (Min/Fixed):: -15V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 100mA

Current - Quiescent (Iq):: 6 mA

Current - Supply (Max):: 6.5 mA

PSRR:: 39dB (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-92-3

L79L15ACZ-TR FAQ

1.How can I place an order for L79L15ACZ-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L79L15ACZ-TR 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 L79L15ACZ-TR reliable?

The price and inventory of L79L15ACZ-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L79L15ACZ-TR is usually 5 days.

3.What payment methods are accepted for L79L15ACZ-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L79L15ACZ-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L79L15ACZ-TR?

L79L15ACZ-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L79L15ACZ-TR 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 L79L15ACZ-TR?

For technical support, including L79L15ACZ-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L79L15ACZ-TR requirements.

6.How does Aetrix verify that L79L15ACZ-TR is sourced from the original manufacturer or authorized distributors?

All L79L15ACZ-TR 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 L79L15ACZ-TR meets industry standards.

7.What is the process for return or replacement of L79L15ACZ-TR?

All L79L15ACZ-TR units undergo pre-shipment inspection (PSI). If there is an issue with L79L15ACZ-TR, 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 L79L15ACZ-TR part is unused and in its original packaging.

Return procedure for L79L15ACZ-TR:

1.Submit a request within 90 days.

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

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