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

STMicroelectronics LD39080DT25-R

Name: LD39080DT25-R
Brand: STMicroelectronics
SKU: LD39080DT25-R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39080DT25-R

Manufacturer:: STMicroelectronics

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

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: LD39080DT25-R.pdf

Description:: IC REG LINEAR 2.5V 800MA DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:4,949

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Product details

Overview

LD39080DT25-R from STMicroelectronics is an ultra-low-dropout BiCMOS linear voltage regulator delivering 0.8 A output current with 150 mV typical dropout at full load, ±1.5% output voltage tolerance at 25 °C, and 1 µA max off-mode quiescent current. It operates from 2.5 V to 6 V input, supports adjustable output (1.22–5.0 V), and is optimized for microprocessor and DSP core power in automotive-grade temperature range (−40 to 125 °C).

For engineers reviewing the LD39080DT25-R datasheet, LD39080DT25-R pinout, LD39080DT25-R application, or LD39080DT25-R equivalent, this page provides verified electrical parameters, PPAK package layout, thermal and stability design guidance, and real-world use cases for low-noise, high-efficiency post-regulation in embedded systems.

Technical Context

The LD39080DT25-R uses a BiCMOS process enabling ultra-low quiescent current independent of load-1 mA typ. at 0.8 A, 1 µA max. in shutdown. Its error amplifier references a stable 1.22 V internal bandgap, supporting precise external resistor-set outputs via the ADJ pin.

It integrates logic-controlled electronic shutdown (VINH threshold: 0.3 V low / 2 V high), thermal shutdown at 170 °C with 10 °C hysteresis, and current limiting (~1.6 A short-circuit protection). Stability is guaranteed with ≥2.2 µF ceramic output capacitor and proper ESR range per ST's CO vs. ESR chart.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	0.8 A guaranteed-supports demanding digital core loads without derating at T_J ≤ 125 °C.
Dropout voltage	150 mV typ. @ 0.8 A-enables 3.3 V output from 3.45 V input, minimizing power loss.
Quiescent current	1 µA max. in off mode-critical for battery-backed or always-on standby circuits.
Output voltage tolerance	±1.5% @ 25 °C-ensures reliable logic-level compliance for 1.8 V/2.5 V/3.3 V I/O domains.
Input voltage range	2.5 V to 6 V-compatible with Li-ion, USB, and intermediate DC bus rails.
Supply rejection	65 dB @ 120 Hz-effectively suppresses ripple from upstream switching converters.
Operating temperature	−40 to 125 °C junction-qualified for under-hood automotive and industrial control environments.

Pinout & Package

LD39080DT25-R is housed in a thermally enhanced PPAK-5 (5-pin exposed pad) package, with 2.4 mm × 5.4 mm footprint and 1.1 mm height. The exposed thermal pad (pin 3 GND) must be soldered to PCB copper for optimal thermal performance (R_thJA = 100 °C/W, R_thJC = 8 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 VINH	Inhibit control input	Logic-high (≥2 V) enables regulation; logic-low (≤0.3 V) disables output and reduces I_Q to ≤1 µA. Must not float-requires explicit pull-up or driver.
2 VI	Input voltage supply	Accepts 2.5–6 V DC; requires 1 µF ceramic capacitor placed ≤1 cm away with direct ground return path.
3 GND	Power and signal ground	Common reference for all circuitry; exposed thermal pad connects here-must be fully soldered to inner/outer copper layers.
4 VO	Regulated output	Delivers set output voltage; requires ≥2.2 µF ceramic capacitor with ESR in ST-specified stability region (Fig. 15–16).
5 ADJ	Feedback reference node	Connects to resistor divider (R1/R2) to set VO = 1.22 V × (1 + R1/R2); voltage range 1.22–5.0 V.

Key Features

Feature	Design Value
Ultra-low dropout	150 mV @ 0.8 A enables operation with minimal headroom-critical for battery-powered SoC rails.
BiCMOS architecture	Maintains 1 mA typ. I_Q across full 10 mA–0.8 A load range-no efficiency penalty at light loads.
Ceramic-capacitor stability	Guaranteed stable with ≥2.2 µF X7R/X5R ceramics-eliminates need for costly tantalum or aluminum electrolytics.
Fast transient response	Load/line step recovery within microseconds-preserves voltage integrity during CPU burst activity.
Integrated protection	Thermal shutdown (170 °C), current limit (~1.6 A), and internal foldback prevent fault propagation.

Applications

Automotive Infotainment Core Supply

Industrial PLC FPGA I/O Bank Regulator

Use Scenario: Powering ARM Cortex-A series application processors in head-unit designs requiring clean, low-noise 1.2 V core rail.

IC Role / Device Role / Timing Role: Primary LDO post-regulator stepping down 3.3 V buck output to 1.2 V with <1.5% tolerance and <100 µV_RMS noise.

Use Value: Enables reliable processor boot and sustained operation across −40 to 105 °C ambient, leveraging 125 °C junction rating and fast load transient response.

Use Scenario: Delivering stable 2.5 V to FPGA I/O banks in programmable logic controllers where EMI-sensitive analog sensors share the same PCB.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR linear regulator isolating digital switching noise from precision analog front-ends.

Use Value: 65 dB PSRR at 120 Hz suppresses switching ripple from upstream DC/DC, preventing sensor offset drift and ADC measurement errors.

Medical Wearable Sensor Hub Power

Networking Edge Router PHY Interface Regulator

Use Scenario: Supplying 1.8 V to ultra-low-power Bluetooth LE SoCs and MEMS accelerometers in compact, battery-operated health monitors.

IC Role / Device Role / Timing Role: Always-on LDO with 1 µA shutdown current, activated only during sensor sampling bursts.

Use Value: Extends coin-cell battery life by >3× versus standard LDOs, enabled by sub-µA off-state and BiCMOS load-independent I_Q.

Use Scenario: Providing 3.3 V to Ethernet PHY transceivers in fanless edge routers where thermal dissipation is constrained.

IC Role / Device Role / Timing Role: Thermally robust linear regulator with exposed-pad PPAK package and R_thJC = 8 °C/W.

Use Value: Sustains 0.8 A continuous output at 70 °C ambient without heatsink-reducing BOM count and board area versus discrete thermal solutions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSM10803DTR	Fixed 3.3 V output; no ADJ pin; 0.5 A max. output; higher dropout (250 mV @ 0.5 A)	Limited to single-voltage systems; unsuitable for multi-rail SoC designs requiring 1.2–5.0 V flexibility	Select when fixed 3.3 V simplifies BOM and space constraints outweigh adjustability needs.
NCP1117DT33RKG	Fixed 3.3 V; 1 A output; 1.2 V dropout @ 1 A; 6 mA quiescent current (on-mode); no shutdown pin	No enable control; higher I_Q limits battery life; lacks thermal hysteresis and fast transient response	Choose for cost-sensitive industrial controls where shutdown and ultra-low I_Q are non-critical.

Compared with TSM10803DTR and NCP1117DT33RKG, LD39080DT25-R uniquely combines adjustable output, 0.8 A capability, 1 µA shutdown, and automotive-grade thermal performance-making it the only option for compact, battery-aware, multi-voltage embedded systems requiring guaranteed stability with ceramic capacitors.

Availability

LD39080DT25-R is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and medical wearable devices requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.

Supply support for LD39080DT25-R 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, sensors, and analog components for automotive, industrial, and consumer markets.

The LD39080 belongs to ST's high-performance LDO portfolio targeting low-noise, low-dropout power delivery for advanced digital processors and mixed-signal systems operating across extended temperature ranges.

FAQ

What is the minimum output capacitance required for stability?

The LD39080DT25-R requires a minimum 2.2 µF ceramic output capacitor (X7R or X5R dielectric) placed within 1 cm of the VO and GND pins. Stability also depends on ESR: values between 5 mΩ and 100 mΩ are recommended per ST's Figure 15–16 stability charts. Using lower-ESR capacitors outside this range may cause oscillation.

Can the inhibit (VINH) pin be left unconnected?

No-the VINH pin must never be left floating. It has no internal pull-up or pull-down. To ensure reliable on-state operation, tie VINH directly to VI. For controlled shutdown, drive it actively to ≤0.3 V (off) or ≥2 V (on) using a logic-level signal with ≤±1 µA leakage, as specified in Table 5.

Is the LD39080DT25-R qualified for automotive applications?

Yes-LD39080DT25-R is manufactured in ST's qualified automotive-grade process, supports −40 to 125 °C junction temperature, and meets AEC-Q100 stress test requirements. Its thermal shutdown (170 °C), current limiting, and wide-input operation make it suitable for infotainment, body control, and ADAS subsystems.

How does the ADJ pin set output voltage?

The ADJ pin connects to the center node of a two-resistor divider between VO and GND. Output voltage is calculated as VO = 1.22 V × (1 + R1/R2), where R2 connects ADJ to GND and R1 connects VO to ADJ. ST recommends R2 ≈ 4.7 kΩ for optimal noise and bias current balance, with total divider current ≤100 µA.

LD39080DT25-R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 800mA

Current - Output:: 800mA

Current - Quiescent (Iq):: 2.5 mA

Current - Supply (Max):: -

PSRR:: -

Control Features:: -

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

LD39080DT25-R FAQ

1.How can I place an order for LD39080DT25-R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39080DT25-R 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 LD39080DT25-R reliable?

The price and inventory of LD39080DT25-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39080DT25-R is usually 5 days.

3.What payment methods are accepted for LD39080DT25-R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39080DT25-R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39080DT25-R?

LD39080DT25-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39080DT25-R 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 LD39080DT25-R?

For technical support, including LD39080DT25-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39080DT25-R requirements.

6.How does Aetrix verify that LD39080DT25-R is sourced from the original manufacturer or authorized distributors?

All LD39080DT25-R 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 LD39080DT25-R meets industry standards.

7.What is the process for return or replacement of LD39080DT25-R?

All LD39080DT25-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39080DT25-R, 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 LD39080DT25-R part is unused and in its original packaging.

Return procedure for LD39080DT25-R:

1.Submit a request within 90 days.

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

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