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

STMicroelectronics L7912ACD2T-TR

Name: L7912ACD2T-TR
Brand: STMicroelectronics
SKU: L7912ACD2T-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7912ACD2T-TR

Manufacturer:: STMicroelectronics

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

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

Datasheet:: L7912ACD2T-TR.pdf

Description:: IC REG LINEAR -12V 1.5A D2PAK

Quantity:: RFQ Add To RFQ list

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Inventory:2,703

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Product details

Overview

L7912ACD2T-TR from STMicroelectronics is a fixed-output, three-terminal negative linear voltage regulator delivering -12 V at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and SOA-controlled output transition. It operates with input voltages up to -30 V (for -12 V output), supports local on-card regulation in split-supply systems, and is commonly used in industrial power supplies and analog circuitry requiring stable negative rail generation.

For engineers reviewing the L7912ACD2T-TR datasheet, L7912ACD2T-TR pinout, L7912ACD2T-TR application, or L7912ACD2T-TR equivalent, key selection criteria include guaranteed -12 V output tolerance (±2 %), dropout voltage of 1.1 V at 1 A, junction temperature range (0–125 °C), and D2PAK package thermal resistance (R_thJC = 3 °C/W).

Technical Context

This device implements a monolithic PNP pass transistor-based linear regulation architecture with internal current limiting, thermal shutdown, and safe operating area (SOA) protection. Its feedback loop maintains output stability across load currents from -5 mA to -1.5 A and input voltages from -15.5 V to -27 V under specified thermal conditions.

Designed for fixed-voltage operation, it does not require external compensation but supports adjustable configurations via external resistive dividers. Output noise is 200 µV_RMS (10 Hz–100 kHz), and supply voltage rejection is 54–60 dB at 120 Hz - critical for low-noise analog subsystems and dual-rail op-amp biasing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	-12 V ±2 % (guaranteed over temperature and load, enabling precise negative rail generation)
Max Output Current	1.5 A continuous (with adequate heatsinking; internally limited during fault conditions)
Dropout Voltage	1.1 V at 1 A (defines minimum input-to-output differential needed to sustain regulation)
Line Regulation	120 mV (over VI = -16 V to -22 V at 25 °C; determines sensitivity to input ripple)
Load Regulation	120 mV (over IO = 5 mA to 1.5 A at 25 °C; ensures stable output across dynamic loads)
Quiescent Current	3 mA typical (low no-load power draw; enables efficient standby operation)
Output Noise	200 µV RMS (10 Hz–100 kHz; suitable for noise-sensitive analog signal chains)

Pinout & Package

The L7912ACD2T-TR is housed in a surface-mount D2PAK (TO-263) package with exposed thermal pad, optimized for high-power dissipation in compact PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
Input (IN)	Negative input supply connection	Accepts unregulated negative DC input (e.g., -19 V); must be decoupled with ≥2.2 µF solid tantalum capacitor
Ground (GND)	Reference node / common return	Serves as output voltage reference point; requires low-inductance PCB routing to minimize noise coupling
Output (OUT)	Regulated negative output terminal	Delivers stable -12 V; requires ≥1 µF output capacitor for stability and transient response

Key Features

Feature	Design Value
Thermal Overload Protection	Automatic shutdown at T_J > 125 °C prevents permanent damage during sustained overload or poor heatsinking
Short-Circuit Current Limiting	1.5 A continuous / 2.5 A peak limits fault energy and enables safe recovery after overload removal
SOA-Protected Output Transition	Prevents secondary breakdown during fast load transients or capacitive switching events
Fixed -12 V Output	Eliminates need for external feedback components, reducing BOM count and layout complexity
ECOPACK® Compliant Packaging	Lead-free second-level interconnect meets RoHS and JEDEC JESD97 environmental standards

Applications

Industrial Power Supplies

Analog Signal Conditioning

Use Scenario: Local regulation of -12 V rail in programmable logic controller (PLC) I/O modules with shared input bus.

IC Role / Device Role / Timing Role: Negative voltage regulator providing isolated, low-noise bias for operational amplifiers and ADC drivers.

Use Value: Maintains ±2 % output accuracy across -40 °C to +85 °C ambient, ensuring consistent analog front-end performance without recalibration.

Use Scenario: Dual-rail supply for precision instrumentation amplifiers in medical sensor interfaces.

IC Role / Device Role / Timing Role: Fixed negative regulator complementing L7812AC to generate symmetric ±12 V rails.

Use Value: 200 µV RMS output noise and 60 dB SVR suppress supply-induced errors in 16-bit+ data acquisition systems.

Test & Measurement Equipment

Legacy Industrial Control Systems

Use Scenario: Bias supply for analog multiplexers and DAC output buffers in automated test equipment (ATE) racks.

IC Role / Device Role / Timing Role: Local regulation replacing centralized negative supplies to reduce ground bounce and improve channel-to-channel isolation.

Use Value: 1.5 A capability supports multiple parallel analog stages; SOA protection ensures reliability during hot-swap events.

Use Scenario: Retrofit replacement for aging -12 V regulators in factory-floor motor drive control boards.

IC Role / Device Role / Timing Role: Drop-in compatible negative regulator supporting legacy schematics with TO-220 footprint adaptation.

Use Value: D2PAK thermal performance (R_thJC = 3 °C/W) enables higher power density than TO-220 equivalents without redesigning heatsink layout.

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
LM7912CD2T	Same -12 V output, but wider line regulation (240 mV vs. 120 mV) and higher quiescent current (6 mA vs. 3 mA)	Lower PSRR (45 dB) and higher noise (400 µV) limit use in precision analog circuits	Preferred only when LM79xx family compatibility is required in legacy designs
MC7912BD2TG	±4 % output tolerance (vs. ±2 %), lower max current (1.2 A), and no SOA protection	Lacks output transition safety margin; unsuitable for high-capacitance loads or frequent hot-plug events	Cost-optimized option where tighter regulation and robustness are non-critical

Compared with LM7912CD2T and MC7912BD2TG, the L7912ACD2T-TR provides superior output accuracy, lower noise, and integrated SOA protection - making it the preferred choice for industrial analog systems demanding long-term stability and fault resilience.

Availability

L7912ACD2T-TR is available at Aetrix Electronics and suitable for industrial power supplies, analog signal conditioning, and test & measurement equipment requiring stable component supply and long-lifecycle support.

Supply support for L7912ACD2T-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, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal design heritage.

The L79xxAC series belongs to ST's legacy linear regulator product line, engineered specifically for robust, cost-effective negative voltage regulation in industrial and embedded systems where reliability and thermal resilience are prioritized over ultra-low quiescent current.

FAQ

What is the minimum input voltage required for stable -12 V output?

The L7912ACD2T-TR requires a minimum input voltage of -15.5 V to maintain regulation across full load (1.5 A) and temperature range (0–125 °C). At 1 A load and 25 °C, dropout is 1.1 V, so -13.1 V suffices - but design margin mandates -15.5 V per datasheet test conditions.

Can this regulator be used in adjustable configurations?

Yes - though designed as a fixed -12 V device, it can be configured for adjustable negative output using external resistors per Figure 6 in the datasheet. The GND pin becomes the ADJ node, and output voltage is set by VO = V_REF(1 + R1/R2), where V_REF = -12 V. Stability and current limits must be re-evaluated.

Is a heat sink mandatory for 1.5 A operation?

A heat sink is mandatory for continuous 1.5 A operation at ambient temperatures above 40 °C. With R_thJA = 62.5 °C/W (D2PAK, no heatsink), power dissipation of 16.5 W (at VI = -27 V, VO = -12 V) would exceed 125 °C junction limit. A heatsink reducing R_thJA to ≤25 °C/W is required for full-load operation at 70 °C ambient.

Does this part support reverse-polarity input protection?

No - the L7912ACD2T-TR lacks built-in reverse-polarity protection. Applying positive voltage to the IN pin or reversing input polarity will cause immediate device failure. External protection (e.g., series diode or MOSFET-based reverse-voltage guard) must be added if input misconnection is possible in the system.

L7912ACD2T-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):: -12V

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

L7912ACD2T-TR FAQ

1.How can I place an order for L7912ACD2T-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L7912ACD2T-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 L7912ACD2T-TR reliable?

The price and inventory of L7912ACD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7912ACD2T-TR is usually 5 days.

3.What payment methods are accepted for L7912ACD2T-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7912ACD2T-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7912ACD2T-TR?

L7912ACD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7912ACD2T-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 L7912ACD2T-TR?

For technical support, including L7912ACD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7912ACD2T-TR requirements.

6.How does Aetrix verify that L7912ACD2T-TR is sourced from the original manufacturer or authorized distributors?

All L7912ACD2T-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 L7912ACD2T-TR meets industry standards.

7.What is the process for return or replacement of L7912ACD2T-TR?

All L7912ACD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7912ACD2T-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 L7912ACD2T-TR part is unused and in its original packaging.

Return procedure for L7912ACD2T-TR:

1.Submit a request within 90 days.

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

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