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

STMicroelectronics L7905C-D2TR

Name: L7905C-D2TR
Brand: STMicroelectronics
SKU: L7905C-D2TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7905C-D2TR

Manufacturer:: STMicroelectronics

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

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

Datasheet:: L7905C-D2TR.pdf

Description:: IC REG LINEAR -5V 1.5A D2PAK

Quantity:: RFQ Add To RFQ list

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Inventory:3,700

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Product details

Overview

L7905C-D2TR from STMicroelectronics is a three-terminal fixed-output negative voltage regulator delivering -5 V at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and output transition SOA protection in a D²PAK package. It enables local on-card regulation for split-supply systems, such as ±15 V analog front-ends in industrial instrumentation and audio power amplifiers.

For engineers reviewing the L7905C-D2TR datasheet, L7905C-D2TR pinout, L7905C-D2TR application, or L7905C-D2TR equivalent, key selection criteria include guaranteed -5 V output tolerance (±50 mV at 500 mA), dropout voltage of 1.4 V at 1 A, supply voltage rejection of 54–60 dB at 120 Hz, junction-to-case thermal resistance of 3 °C/W, and compatibility with solid tantalum output capacitors for stability.

Technical Context

The L7905C-D2TR implements a monolithic PNP pass transistor-based linear regulation architecture with internal current limiting, thermal shutdown, and safe operating area (SOA) protection during transient overloads. Its feedback loop maintains output regulation across input voltages from -8 V to -20 V and load currents from -5 mA to -1.5 A.

Designed for fixed-voltage operation, it supports external circuitry for adjustable outputs or high-current configurations (e.g., with external pass transistors). The device operates over a junction temperature range of 0 to 150 °C and requires no external components for basic functionality beyond input/output capacitors per Figure 4 of the datasheet.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	-5 V ±50 mV at IO = 500 mA, ensuring stable biasing for op-amp dual supplies and analog signal chains
Maximum Output Current	1.5 A continuous with adequate heatsinking, supporting medium-power analog subsystems
Dropout Voltage	1.4 V at IO = 1 A and ΔVO = 100 mV, defining minimum input headroom required for regulation
Supply Voltage Rejection	54–60 dB at 120 Hz, critical for rejecting ripple from unregulated DC-DC or rectified AC sources
Output Noise Voltage	100 µV RMS (10 Hz–100 kHz), enabling low-noise performance in precision sensor interfaces
Thermal Resistance (Junction-to-Case)	3 °C/W in D²PAK package, allowing direct heatsink mounting for high-power dissipation
Line Regulation	50 mV over VI = -8 V to -12 V at TJ = 25°C, minimizing output drift due to input variation
Load Regulation	50 mV over IO = 250 mA to 750 mA at TJ = 25°C, ensuring consistent voltage under dynamic loads

Pinout & Package

Package: D²PAK (TO-263), surface-mount, thermally enhanced plastic package with exposed drain pad for heatsinking.

Pin/Terminal	Circuit Role	Design Meaning
Input (IN)	Negative input supply connection	Accepts unregulated negative DC input; must be ≥1.4 V more negative than output to maintain regulation
Ground (GND)	Reference node for output and feedback	Serves as common return path; not connected to system ground in split-supply topologies
Output (OUT)	Regulated negative output terminal	Delivers stable -5 V to load; requires ≥1 µF solid tantalum capacitor for stability per datasheet Figure 4

Key Features

Feature	Design Value
Thermal Overload Protection	Shuts down regulator when junction temperature exceeds 150 °C, preventing permanent damage during sustained overload
Short-Circuit Current Limit	Clamps output current to 2.1 A typical, enabling safe operation during accidental output-to-ground faults
SOA-Protected Output Stage	Guarantees safe operation during transient overloads without external foldback circuitry
Low Quiescent Current	3 mA at TJ = 25°C, minimizing standby power loss in always-on industrial control modules
Wide Input Voltage Range	Supports -8 V to -20 V input, accommodating variable transformer secondaries or upstream DC-DC outputs

Applications

Industrial Analog Signal Conditioning

Audio Power Amplifier Biasing

Use Scenario: Precision sensor signal conditioning in PLC I/O modules requiring dual-rail ±5 V or ±15 V supplies.

IC Role / Device Role / Timing Role: Provides stable negative rail for op-amps and ADC drivers in isolated analog front-ends.

Use Value: Tight output tolerance (±1%) and low noise (100 µV) preserve signal integrity in 16-bit measurement systems.

Use Scenario: Dual-rail power for Class-AB audio amplifier stages in professional mixing consoles.

IC Role / Device Role / Timing Role: Supplies clean -5 V bias to complementary NPN/PNP output stage driver circuits.

Use Value: High PSRR (60 dB) suppresses switching noise from adjacent SMPS, reducing audible hum.

Split-Supply Microcontroller Peripherals

Legacy RS-232 Transceiver Power

Use Scenario: Powering op-amp-based level shifters and analog comparators interfacing with 3.3 V microcontrollers.

IC Role / Device Role / Timing Role: Generates localized -5 V rail to extend analog input range beyond GND reference.

Use Value: On-card regulation eliminates long-trace IR drop and improves immunity to board-level noise coupling.

Use Scenario: Supplying negative voltage to MAX232-compatible RS-232 line drivers in embedded serial gateways.

IC Role / Device Role / Timing Role: Delivers regulated -5 V for RS-232 logic-level translation and charge-pump biasing.

Use Value: Guaranteed 1.5 A output supports multiple transceivers and withstands ESD-induced surge currents.

Equivalent & Alternatives

The following parts are listed as comparable options for similar negative linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM7905CT	TO-220 package, R_thJA = 50 °C/W vs. 62.5 °C/W for D²PAK; identical -5 V spec and protection features	Requires larger heatsink for same 1.5 A load due to higher junction-to-ambient thermal resistance	Select when through-hole assembly or legacy footprint compatibility is required
MC7905BD2TG	D²PAK package like L7905C-D2TR but with tighter initial output tolerance (±2% vs. ±5%) and lower quiescent current (2.5 mA)	Better suited for battery-backed systems where standby current matters, but lacks ST's SOA protection architecture	Select when higher initial accuracy and lower IQ outweigh need for robust SOA protection

Compared with LM7905CT and MC7905BD2TG, the L7905C-D2TR offers superior thermal performance in surface-mount designs (R_thJC = 3 °C/W), integrated SOA protection for transient reliability, and optimized stability with standard tantalum capacitors-making it preferred for space-constrained industrial power rails.

Availability

L7905C-D2TR is available at Aetrix Electronics and suitable for industrial analog signal conditioning, audio power amplifier biasing, split-supply microcontroller peripherals, and legacy RS-232 transceiver power requiring stable component supply and long-term obsolescence management.

Supply support for L7905C-D2TR 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 L79xxC series was developed to provide robust, cost-effective negative linear regulation for split-supply systems in industrial control, test equipment, and audio electronics-emphasizing reliability, thermal resilience, and ease of use without external compensation.

FAQ

What is the minimum input voltage required for the L7905C-D2TR to regulate at full load?

The L7905C-D2TR requires a minimum input voltage of -6.4 V to maintain regulation at 1 A output, based on its 1.4 V dropout voltage specification. At 1.5 A, derating applies due to thermal limits; with a heatsink achieving ≤20 °C/W junction-to-ambient, input must be ≤-7.5 V to sustain regulation without thermal shutdown.

Can the L7905C-D2TR be used in parallel for higher current output?

No-parallel operation is not recommended due to mismatched output voltages causing current hogging and potential thermal runaway. For >1.5 A, ST recommends using the L7905C-D2TR with an external PNP pass transistor as shown in Figure 7 of the datasheet, which provides controlled current sharing and preserves built-in protection functions.

Which output capacitor type and value does ST specify for stability?

ST specifies a minimum 1 µF solid tantalum capacitor at the output for stability, as shown in Figure 4. Aluminum electrolytic capacitors require ≥10 µF due to higher ESR; ceramic capacitors are not recommended alone because their low ESR can cause oscillation without added series resistance per application note AN2814.

Does the L7905C-D2TR support adjustable output voltage configurations?

Yes-though designed as a fixed -5 V regulator, it can be configured for adjustable negative output using external resistors as shown in Figure 6. The ADJ pin is not present; instead, the ground pin is elevated via resistor divider to set VO = V_REF(1 + R1/R2), where V_REF = -5 V, enabling outputs more negative than -5 V with appropriate input headroom.

L7905C-D2TR 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):: -5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.4V @ 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

L7905C-D2TR FAQ

1.How can I place an order for L7905C-D2TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L7905C-D2TR 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 L7905C-D2TR reliable?

The price and inventory of L7905C-D2TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7905C-D2TR is usually 5 days.

3.What payment methods are accepted for L7905C-D2TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7905C-D2TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7905C-D2TR?

L7905C-D2TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7905C-D2TR 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 L7905C-D2TR?

For technical support, including L7905C-D2TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7905C-D2TR requirements.

6.How does Aetrix verify that L7905C-D2TR is sourced from the original manufacturer or authorized distributors?

All L7905C-D2TR 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 L7905C-D2TR meets industry standards.

7.What is the process for return or replacement of L7905C-D2TR?

All L7905C-D2TR units undergo pre-shipment inspection (PSI). If there is an issue with L7905C-D2TR, 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 L7905C-D2TR part is unused and in its original packaging.

Return procedure for L7905C-D2TR:

1.Submit a request within 90 days.

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

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