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

STMicroelectronics LD39080PT33-R

Name: LD39080PT33-R
Brand: STMicroelectronics
SKU: LD39080PT33-R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39080PT33-R

Manufacturer:: STMicroelectronics

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

Package:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

Datasheet:: LD39080PT33-R.pdf

Description:: IC REG LINEAR 3.3V 800MA PPAK

Quantity:: RFQ Add To RFQ list

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Inventory:3,903

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Product details

Overview

LD39080PT33-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 space-constrained industrial and automotive systems.

For engineers reviewing the LD39080PT33-R datasheet, LD39080PT33-R pinout, LD39080PT33-R application, or LD39080PT33-R equivalent, key selection criteria include guaranteed 0.8 A load capability, ceramic-capacitor stability, logic-controlled shutdown, thermal/current protection, and PPAK package thermal performance (R_thJC = 8 °C/W).

Technical Context

The LD39080PT33-R uses a BiCMOS process enabling ultra-low quiescent current independent of load-1 mA typ. at 0.8 A, 1 µA max. in inhibit-off mode. Its error amplifier references a stable 1.22 V internal bandgap, supporting precise external resistor-set outputs via the ADJ pin.

It features fast transient response to line/load steps, 65 dB SVR at 120 Hz, and built-in protections: thermal shutdown (170 °C trip), current limiting (~1.6 A short-circuit), and logic-controlled inhibit with defined VIH/VIL thresholds (≥2 V / ≤0.3 V). Stability is ensured with ≥2.2 µF ceramic output capacitance and ESR constraints per Figure 15–16.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	0.8 A guaranteed-supports high-current digital 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, maximizing efficiency in low-V_IN systems.
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 core voltage compliance for 3.3 V FPGA or MCU I/O domains.
Input voltage range	2.5 V to 6 V-compatible with single-cell Li-ion, 3.3 V/5 V rails, and post-regulation after buck converters.
Thermal resistance	R_thJC = 8 °C/W-enables >0.5 W dissipation with minimal junction-to-case ΔT in PPAK layout.
Stability capacitor	2.2 µF ceramic min.-reduces BOM cost and board area vs. tantalum; no external compensation required.

Pinout & Package

LD39080PT33-R is housed in a thermally enhanced PPAK-5 (5-pin exposed-pad) package, with 2.4 mm × 5.4 mm footprint and 0.23 mm profile. The exposed thermal pad must be soldered to PCB copper for optimal R_thJA (100 °C/W) and current handling.

Pin/Terminal	Circuit Role	Design Meaning
1: VINH	Inhibit control input	Logic-high (≥2 V) enables output; ≤0.3 V disables regulator and reduces I_Q to ≤1 µA-requires external pull-up if unused.
2: VI	Input voltage supply	Accepts 2.5–6 V; requires 1 µF ceramic cap placed ≤1 cm away to suppress high-frequency noise and prevent oscillation.
3: GND	Analog/digital ground reference	Common return for VI, VO, ADJ, and VINH; must connect directly to thermal pad and low-impedance ground plane.
4: VO	Regulated output	3.3 V fixed output (LD39080PT33-R); requires ≥2.2 µF ceramic CO with ESR < 100 mΩ for stability across -40 to 125 °C.
5: ADJ	Feedback reference node	Internally connected to 1.22 V bandgap; unused on fixed-output variants but must be left unconnected (not grounded) on PT33-R.

Key Features

Feature	Design Value
BiCMOS process architecture	Enables 1 µA off-mode current and 1 mA on-mode I_Q regardless of 0–0.8 A load-ideal for duty-cycled systems.
Ultra-low dropout	20 mV typ. @ 150 mA allows 3.3 V output from 3.32 V source-preserves headroom in multi-rail power trees.
Fast dynamic response	Load transient recovery <15 µs (TD-ON/TD-OFF)-maintains voltage integrity during CPU burst-mode operation.
Ceramic capacitor compatibility	Stable with 2.2 µF X7R/X5R ceramics-eliminates electrolytic aging concerns and reduces footprint by 60% vs. tantalum.
Integrated protection	Thermal shutdown (170 °C), current limit (~1.6 A), and reverse-current blocking-no external circuitry needed for robust field deployment.

Applications

Microprocessor Core Supply

DSP Power Management

Use Scenario: Providing clean, low-noise 3.3 V power to ARM Cortex-A/M series SoCs in industrial gateways.

IC Role / Device Role / Timing Role: Primary core LDO delivering regulated voltage with <100 µV_RMS noise (10 Hz–100 kHz) and fast load-step response.

Use Value: Prevents logic errors during CPU frequency scaling; eliminates need for secondary filtering stages.

Use Scenario: Powering TI C6000 or Analog Devices SHARC DSPs in real-time audio processing units.

IC Role / Device Role / Timing Role: Low-dropout post-regulator after a switching DC/DC, rejecting ripple from upstream converter.

Use Value: Achieves 65 dB supply rejection at 120 Hz-suppresses switching artifacts that cause audible distortion.

Automotive Body Control Module

Industrial PLC I/O Power

Use Scenario: Supplying 3.3 V to CAN transceivers and microcontrollers in under-hood ECUs rated to 125 °C.

IC Role / Device Role / Timing Role: High-reliability linear regulator with guaranteed operation across -40 to 125 °C junction temperature.

Use Value: Maintains ±3% output accuracy over full temp range-meets AEC-Q100 Grade 1 requirements without derating.

Use Scenario: Powering isolated digital I/O channels in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Logic-controlled LDO enabling remote power cycling of I/O banks via microcontroller GPIO.

Use Value: Reduces system standby power by 99% using VINH shutdown-extends uptime in battery-buffered backup modes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B332MR-G	0.5 A output, 250 mV dropout @ 0.5 A, R_thJA = 150 °C/W, no inhibit pin	Limited to lower-current peripherals; lacks enable control for power sequencing	Choose only for cost-sensitive, non-sequenced 3.3 V rails where 0.5 A suffices.
ROHM BD3985FV-ME2	0.8 A output, 200 mV dropout @ 0.8 A, 2.5 µA I_Q on-mode, SOT-23-5 package	Higher R_thJA (200 °C/W) limits power dissipation; smaller package reduces thermal margin	Select when board space is critical and thermal load <0.25 W; avoid in high-ambient or sealed enclosures.

Compared with XC6210B332MR-G and BD3985FV-ME2, LD39080PT33-R delivers superior thermal performance (R_thJC = 8 °C/W), lowest off-mode current (1 µA), and integrated inhibit-making it optimal for thermally demanding, power-gated embedded systems.

Availability

LD39080PT33-R is available at Aetrix Electronics and suitable for microprocessor core supplies, DSP power management, and automotive body control modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LD39080PT33-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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LD39080 belongs to ST's high-performance LDO portfolio, engineered specifically for low-voltage, high-efficiency power delivery in thermally constrained digital systems-emphasizing ultra-low dropout, ceramic stability, and robust protection.

FAQ

What is the maximum allowable input voltage for LD39080PT33-R?

The absolute maximum DC input voltage is 6.5 V, but the recommended operating range is 2.5 V to 6 V per datasheet Section 5. Exceeding 6 V risks permanent damage due to internal clamp limitations, and operation below 2.5 V prevents regulation at 3.3 V output. For 3.3 V output, minimum functional input is 3.45 V (3.3 V + 150 mV dropout).

Can LD39080PT33-R operate without an output capacitor?

No. The device requires a minimum 2.2 µF ceramic output capacitor placed within 1 cm of the VO and GND pins to ensure stability across all load and temperature conditions. Omitting CO causes oscillation and potential damage; ESR must also remain within the stability region shown in Figures 15–16 of the datasheet.

Is the ADJ pin used on the LD39080PT33-R fixed-output variant?

No. LD39080PT33-R is the 3.3 V fixed-output version; the ADJ pin is internally connected to the feedback network and must be left unconnected (floating) on the PCB. Connecting ADJ to GND or VO will disrupt regulation and is explicitly prohibited in Section 7.5 of the datasheet.

How does the inhibit function behave during power-up?

VINH must be driven above 2 V within 100 µs of VI reaching 2.5 V to guarantee reliable turn-on; if VINH remains ≤0.3 V during startup, the output stays disabled and I_Q stays ≤1 µA. The inhibit pin has no internal pull-up/down, so an external 100 kΩ pull-up to VI is recommended for default-enable configurations.

LD39080PT33-R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-5, DPAK (4 Leads + Tab), TO-252AD

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):: 3.3V

Voltage - Output (Max):: -

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

Current - Output:: 800mA

Current - Quiescent (Iq):: 2.5 mA

Current - Supply (Max):: -

PSRR:: 65dB ~ 55dB (120Hz ~ 1kHz)

Control Features:: Enable

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

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PPAK

LD39080PT33-R FAQ

1.How can I place an order for LD39080PT33-R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39080PT33-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 LD39080PT33-R reliable?

The price and inventory of LD39080PT33-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39080PT33-R is usually 5 days.

3.What payment methods are accepted for LD39080PT33-R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39080PT33-R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39080PT33-R?

LD39080PT33-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39080PT33-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 LD39080PT33-R?

For technical support, including LD39080PT33-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39080PT33-R requirements.

6.How does Aetrix verify that LD39080PT33-R is sourced from the original manufacturer or authorized distributors?

All LD39080PT33-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 LD39080PT33-R meets industry standards.

7.What is the process for return or replacement of LD39080PT33-R?

All LD39080PT33-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39080PT33-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 LD39080PT33-R part is unused and in its original packaging.

Return procedure for LD39080PT33-R:

1.Submit a request within 90 days.

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

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