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

STMicroelectronics L7915CD2T-TR

Name: L7915CD2T-TR
Brand: STMicroelectronics
SKU: L7915CD2T-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7915CD2T-TR

Manufacturer:: STMicroelectronics

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

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: L7915CD2T-TR.pdf

Description:: IC REG LINEAR -15V 1.5A D2PAK

Quantity:: RFQ Add To RFQ list

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Inventory:4,828

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Product details

Overview

L7915CD2T-TR from STMicroelectronics is a fixed-output, three-terminal negative linear voltage regulator delivering -15 V at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and output transition SOA protection. It is housed in a D²PAK surface-mount package and designed for local on-card regulation in split-supply systems, industrial power rails, and analog circuitry requiring stable negative bias.

For engineers reviewing the L7915CD2T-TR datasheet, L7915CD2T-TR pinout, L7915CD2T-TR application, or L7915CD2T-TR equivalent, key selection criteria include guaranteed -15 V output tolerance (±3.3% at 25°C), dropout voltage of 1.1 V at 1 A, junction-to-case thermal resistance of 3°C/W, and compatibility with standard ±15 V dual-rail op-amp and ADC reference designs.

Technical Context

The L7915CD2T-TR implements a monolithic PNP pass transistor architecture with internal current limiting, thermal shutdown, and safe operating area (SOA) protection during transient overloads. Its feedback loop maintains regulation across input voltages from -18.5 V to -30 V and load currents from -5 mA to -1.5 A.

It operates within a junction temperature range of 0–150°C and requires external input (≥2.2 µF solid tantalum) and output (≥1 µF) capacitors for stability per Figure 4 of the datasheet. Ripple rejection is 54–60 dB at 120 Hz, and output noise is 250 µV RMS (10 Hz–100 kHz).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	-15 V nominal; -14.3 V to -15.7 V over full load/temperature range - ensures compliance with ±15 V analog system rails.
Output Current	Up to 1.5 A continuous - supports high-current analog stages like power op-amps or DAC buffers.
Dropout Voltage	1.1 V at 1 A, 25°C - enables operation with minimal headroom from -16.1 V input in compact designs.
Line Regulation	150 mV max over VI = -20 V to -26 V - limits output drift due to unregulated supply ripple or sag.
Load Regulation	150 mV max over IO = 5 mA to 1.5 A - maintains stable bias for precision circuits under dynamic loading.
Thermal Resistance (Junction-to-Case)	3°C/W - allows >1.5 A operation with modest heatsinking (e.g., 25 cm² copper pour).
Supply Voltage Rejection	54–60 dB at 120 Hz - suppresses low-frequency ripple from transformer-rectifier supplies.

Pinout & Package

Package: D²PAK (TO-263), surface-mount, single-ended heat slug on pin 2 (Tab), RoHS-compliant ECOPACK®.

Pin/Terminal	Circuit Role	Design Meaning
1 (Input)	Negative Input Supply	Accepts unregulated negative DC input; must be ≥1.1 V more negative than output to maintain regulation.
2 (Tab / GND)	Ground / Heat Sink Connection	Electrically connected to ground; serves as primary thermal path - must be soldered to PCB copper pour for thermal performance.
3 (Output)	Regulated Negative Output	Delivers stable -15 V; requires ≥1 µF output capacitor (solid tantalum recommended) for stability.

Key Features

Feature	Design Value
Fixed -15 V Output	Eliminates external resistor network; reduces BOM count and layout sensitivity in dual-rail systems.
Internal Short-Circuit Protection	Limits output current to 1.3 A typical during fault - prevents catastrophic failure without external fusing.
Thermal Overload Shutdown	Activates at ~150°C junction temperature - provides self-protection during sustained overload or inadequate heatsinking.
SOA-Protected Pass Transistor	Prevents secondary breakdown during capacitive load turn-on or line transients - improves reliability in industrial environments.
Low Quiescent Current	3 mA typical at 25°C - minimizes no-load power loss in battery-backed or standby-sensitive systems.

Applications

Industrial Signal Conditioning

Audio Power Amplifier Bias

Use Scenario: Providing clean, stable -15 V rail for instrumentation amplifiers and 16-bit ADC reference buffers in PLC analog I/O modules.

IC Role / Device Role / Timing Role: Local negative voltage regulator supplying precision analog front-end circuitry.

Use Value: Maintains <±0.1% gain accuracy by minimizing supply-induced offset drift and enabling <1 LSB integral nonlinearity error.

Use Scenario: Generating symmetrical ±15 V supplies for Class-AB audio power amplifier stages in pro-audio mixing consoles.

IC Role / Device Role / Timing Role: Negative rail regulator paired with L7815C for dual-rail op-amp and driver IC biasing.

Use Value: Delivers 1.5 A peak current with <150 mV load regulation - prevents clipping distortion during dynamic bass transients.

Test & Measurement Equipment

Legacy Analog Control Systems

Use Scenario: Powering high-precision digital-to-analog converters (DACs) and calibration references in benchtop multimeters and source-measure units.

IC Role / Device Role / Timing Role: Low-noise (-15 V) supply generator with 250 µV RMS output noise.

Use Value: Enables <14-bit effective resolution by suppressing supply-induced quantization noise floor elevation.

Use Scenario: Replacing aging discrete negative regulators in legacy motor drive control boards using analog comparators and op-amp-based PID controllers.

IC Role / Device Role / Timing Role: Drop-in replacement for obsolete -15 V regulators in field-deployed industrial controllers.

Use Value: Matches footprint and electrical behavior of prior TO-220 parts while offering improved thermal robustness in convection-cooled enclosures.

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
L7915CP	TO-220 through-hole package; R_thJA = 50°C/W vs. 62.5°C/W for D²PAK - higher thermal margin at same ambient but larger footprint.	Preferred where manual assembly, prototyping, or heatsink mounting with screw terminals is required.	Select when board-level reworkability or mechanical heatsink attachment outweighs space constraints.
LM337LD	Adjustable negative regulator (requires two external resistors); ±1% initial output accuracy vs. ±3.3% for L7915CD2T-TR; lower quiescent current (2.5 mA).	Suitable for non-standard voltages or designs requiring programmable trim; not drop-in for fixed -15 V.	Choose only if voltage flexibility or tighter initial tolerance justifies added component count and layout complexity.

Compared with L7915CP, the D²PAK variant offers superior power density and automated assembly compatibility; compared with LM337LD, it trades adjustability for simplicity, reliability, and guaranteed -15 V compliance without calibration.

Availability

L7915CD2T-TR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and professional audio systems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for L7915CD2T-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 microcontrollers, power management ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The L79xxC series was developed specifically for cost-effective, robust local regulation in dual-rail analog systems - emphasizing thermal resilience, fault tolerance, and direct compatibility with the L78xx positive regulator family.

FAQ

What is the minimum input voltage required for regulation with L7915CD2T-TR?

The device requires a minimum input voltage of -16.1 V (i.e., -15 V – 1.1 V dropout) at 1 A load and 25°C to maintain regulation. At higher temperatures or loads, derating applies: input must remain ≥1.1 V more negative than output across the full operating junction temperature range (0–150°C) and load current (5 mA–1.5 A).

Can L7915CD2T-TR be used without an input capacitor?

No - an input capacitor (≥2.2 µF solid tantalum) is mandatory if the regulator is located more than ~2 inches from the main filter capacitor, per Section 6 of the datasheet. Omitting it risks instability, oscillation, or failure to reject input ripple, especially under fast load transients or high-impedance source conditions.

Is the D²PAK tab electrically isolated from the circuit?

No - the metal tab (pin 2) is internally connected to ground (GND). It must be soldered to a grounded PCB copper pour for both electrical reference and thermal dissipation. Insulating pads or shoulder washers are not required or recommended unless isolation is explicitly needed - in which case, a different package or regulator should be selected.

Does L7915CD2T-TR support parallel operation for higher current?

No - the L7915CD2T-TR lacks built-in current-sharing features such as current-sense pins or master-slave control. Parallel connection without external ballasting resistors causes unequal current distribution and thermal runaway. For >1.5 A, use the high-current configuration shown in Figure 7 of the datasheet with an external pass transistor.

L7915CD2T-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

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):: 1.1V @ 1A (Typ)

Current - Output:: 1.5A

Current - Quiescent (Iq):: 3 mA

Current - Supply (Max):: -

PSRR:: 60dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

L7915CD2T-TR FAQ

1.How can I place an order for L7915CD2T-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L7915CD2T-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 L7915CD2T-TR reliable?

The price and inventory of L7915CD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7915CD2T-TR is usually 5 days.

3.What payment methods are accepted for L7915CD2T-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7915CD2T-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7915CD2T-TR?

L7915CD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7915CD2T-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 L7915CD2T-TR?

For technical support, including L7915CD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7915CD2T-TR requirements.

6.How does Aetrix verify that L7915CD2T-TR is sourced from the original manufacturer or authorized distributors?

All L7915CD2T-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 L7915CD2T-TR meets industry standards.

7.What is the process for return or replacement of L7915CD2T-TR?

All L7915CD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7915CD2T-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 L7915CD2T-TR part is unused and in its original packaging.

Return procedure for L7915CD2T-TR:

1.Submit a request within 90 days.

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

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