Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics L7905ACV-DG

Name: L7905ACV-DG
Brand: STMicroelectronics
SKU: L7905ACV-DG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: L7905ACV-DG

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: L7905ACV-DG.pdf

Description:: IC REG LINEAR -5V 1.5A TO220

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,216

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

L7905ACV-DG from STMicroelectronics is a fixed-output, three-terminal negative linear voltage regulator delivering -5 V at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and output transition SOA protection. It operates with input voltages down to -35 V (for -5 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 L7905ACV-DG datasheet, L7905ACV-DG pinout, L7905ACV-DG application, or L7905ACV-DG equivalent, key selection criteria include output voltage accuracy (±2 %), dropout voltage (1.4 V @ 1 A), quiescent current (3 mA), thermal resistance (R_thJA = 50 °C/W in TO-220), and compatibility with standard ±15 V dual-rail designs.

Technical Context

The L7905ACV-DG implements a monolithic PNP pass transistor architecture with internal current limiting, thermal shutdown, and safe operating area (SOA) protection for robust operation under transient overload. Its feedback loop maintains output regulation across load currents from -5 mA to -1.5 A and input voltages from -8 V to -20 V, with line and load regulation specified at ≤50 mV and ≤50 mV respectively at T_J = 25 °C.

Designed as a complementary device to the L78xxA positive regulator series, it enables symmetrical dual-rail power architectures without external compensation. The regulator requires minimal external components: an input capacitor (≥2.2 µF solid tantalum) and output capacitor (≥1 µF) for stability, with optional feedforward capacitor for improved ripple rejection.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	-5 V ±2 % (guaranteed over temperature and load, enabling precise biasing of op-amps and ADC references)
Max Output Current	1.5 A continuous (requires adequate heatsinking; internally limited to prevent damage during overload)
Dropout Voltage	1.4 V @ 1 A, 25 °C (defines minimum input-to-output differential needed to sustain regulation)
Quiescent Current	3 mA typical (low standby power draw critical for low-power analog subsystems)
Supply Rejection	54–60 dB @ 120 Hz (attenuates ripple from unregulated DC inputs, e.g., rectified AC)
Output Noise	100 µV RMS (10 Hz–100 kHz bandwidth; suitable for noise-sensitive analog signal chains)
Thermal Resistance	R_thJA = 50 °C/W (TO-220 package; determines junction temperature rise under given power dissipation)

Pinout & Package

Supplied in TO-220 package (3-pin, vertical mounting, metal tab connected to output terminal), with industry-standard footprint and thermal pad for PCB heatsinking. Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output (viewed from front, leads down).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Input)	Unregulated negative DC input	Accepts -8 V to -20 V supply; must be decoupled with ≥2.2 µF solid tantalum capacitor near pin
Pin 2 (Ground)	Circuit reference node	Common return path for input and output; must be low-impedance connection to minimize noise coupling
Pin 3 (Output)	Regulated -5 V output	Delivers up to 1.5 A; metal tab is electrically connected to this pin-requires isolation if heatsink is grounded

Key Features

Feature	Design Value
Fixed -5 V output with ±2 % tolerance	Eliminates need for external feedback resistors; ensures consistent rail alignment with L7805AC in dual-supply systems
Thermal overload protection	Shuts down output when junction temperature exceeds 125 °C, then auto-recovers after cooling-prevents permanent failure
Short-circuit current limiting	Clamps output current to ~2.1 A (typical), protecting both regulator and downstream circuitry during fault conditions
SOA-protected pass element	Prevents destructive second breakdown during transient overloads or capacitive load switching
Low output noise (100 µV RMS)	Enables use in precision analog circuits (e.g., instrumentation amplifiers, DAC buffers) without additional filtering

Applications

Industrial Power Supplies

Analog Signal Conditioning

Use Scenario: Local regulation of -5 V rail in programmable logic controller (PLC) I/O modules with shared unregulated -24 V bus.

IC Role / Device Role / Timing Role: Negative voltage regulator providing stable bias for op-amps and level-shifting interfaces.

Use Value: Enables compact, isolated local regulation without centralized negative supply, reducing noise coupling and improving system modularity.

Use Scenario: Dual-rail powering of rail-to-rail input/output operational amplifiers in sensor front-end circuits.

IC Role / Device Role / Timing Role: Fixed -5 V generator paired with L7805AC to establish symmetric ±5 V supply for analog signal processing.

Use Value: Matches L7805AC's output accuracy and thermal behavior, ensuring balanced rail performance and minimizing offset drift.

Split-Supply Audio Amplifiers

Legacy Industrial Control Systems

Use Scenario: Biasing of Class-AB audio preamplifier stages in professional audio equipment requiring low-noise negative rail.

IC Role / Device Role / Timing Role: Low-noise negative regulator supplying clean -5 V to op-amp bias networks and active filters.

Use Value: 100 µV RMS output noise and 60 dB SVR suppress power supply hum, preserving signal integrity in high-gain stages.

Use Scenario: Replacement regulator in aging CNC machine control boards originally designed with L7905AC variants.

IC Role / Device Role / Timing Role: Drop-in compatible negative voltage regulator maintaining legacy board functionality and thermal profile.

Use Value: Identical pinout, electrical specs, and TO-220 mechanical dimensions ensure zero redesign effort and full backward compatibility.

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
LM7905CT	Same -5 V output, but ±4 % tolerance (vs. ±2 %); R_thJA = 55 °C/W; no SOA protection	Suitable for cost-sensitive, non-precision applications where tighter regulation is not required	Select when budget constraints outweigh need for tight regulation or enhanced SOA robustness
MC7905BD2TR4G	±2 % tolerance, D2PAK package (R_thJA = 62.5 °C/W); higher thermal resistance than TO-220	Better suited for surface-mount assembly and automated production, but requires larger PCB area for heatsinking	Select for SMT manufacturing flow where through-hole TO-220 is incompatible with assembly process

Compared with LM7905CT and MC7905BD2TR4G, the L7905ACV-DG offers superior output accuracy and lower thermal resistance in TO-220, making it optimal for precision analog and thermally constrained through-hole designs-while retaining full functional equivalence in split-supply topologies.

Availability

L7905ACV-DG is available at Aetrix Electronics and suitable for industrial power supplies, analog signal conditioning, split-supply audio amplifiers, and legacy industrial control systems requiring stable component supply and long-term obsolescence management.

Supply support for L7905ACV-DG 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 discrete devices for industrial, automotive, and consumer markets.

The L79xxAC series belongs to ST's legacy linear regulator product line, engineered specifically for reliable, low-cost, fixed-output negative voltage regulation in dual-rail and local point-of-load applications-emphasizing ruggedness, ease of use, and compatibility with the L78xxA positive counterparts.

FAQ

What is the maximum input voltage for L7905ACV-DG?

The absolute maximum DC input voltage is -35 V for the -5 V output version. Operation above -20 V input is permissible only with derated output current and sufficient heatsinking to maintain junction temperature ≤125 °C. Exceeding -35 V risks permanent device damage per ST's absolute maximum ratings table.

Does L7905ACV-DG require external capacitors?

Yes-ST specifies a minimum 2.2 µF solid tantalum capacitor at the input and 1 µF at the output for stability. Aluminum electrolytic capacitors may be used only if capacitance is increased tenfold (e.g., 22 µF input, 10 µF output). Omitting these capacitors risks oscillation or poor transient response.

Can L7905ACV-DG be used in adjustable configurations?

Yes-though optimized as a fixed -5 V regulator, it can be configured for adjustable output using external resistors per Figure 6 in the datasheet. This requires connecting a voltage divider between output and ground, with the adjust pin tied to the divider junction. Accuracy and regulation degrade compared to fixed-mode operation.

Is L7905ACV-DG RoHS compliant and lead-free?

Yes-L7905ACV-DG is supplied in an ECOPACK®-compliant TO-220 package with lead-free second-level interconnect, meeting RoHS Directive 2011/65/EU. The "DG" suffix denotes green (halogen-free) packaging, and JEDEC JESD97 marking confirms compliance on both package and inner box label.

L7905ACV-DG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

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:: Through Hole

Supplier Device Package:: TO-220

L7905ACV-DG FAQ

1.How can I place an order for L7905ACV-DG through Aetrix?

Please submit a Request for Quotation (RFQ) for L7905ACV-DG 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 L7905ACV-DG reliable?

The price and inventory of L7905ACV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7905ACV-DG is usually 5 days.

3.What payment methods are accepted for L7905ACV-DG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7905ACV-DG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7905ACV-DG?

L7905ACV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7905ACV-DG 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 L7905ACV-DG?

For technical support, including L7905ACV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7905ACV-DG requirements.

6.How does Aetrix verify that L7905ACV-DG is sourced from the original manufacturer or authorized distributors?

All L7905ACV-DG 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 L7905ACV-DG meets industry standards.

7.What is the process for return or replacement of L7905ACV-DG?

All L7905ACV-DG units undergo pre-shipment inspection (PSI). If there is an issue with L7905ACV-DG, 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 L7905ACV-DG part is unused and in its original packaging.

Return procedure for L7905ACV-DG:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…