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

STMicroelectronics ST1L05PU25R

Name: ST1L05PU25R
Brand: STMicroelectronics
SKU: ST1L05PU25R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1L05PU25R

Manufacturer:: STMicroelectronics

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

Package:: 6-VDFN Exposed Pad

Datasheet:: ST1L05PU25R.pdf

Description:: IC REG LINEAR 2.5V 1.3A 6DFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,051

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Product details

Overview

ST1L05PU25R from STMicroelectronics is a fixed-output 2.5 V, 1.3 A low-dropout linear voltage regulator in DFN6 (3×3 mm) package, fabricated using BiCMOS technology to maintain quiescent current ≤650 µA across 0–125 °C junction temperature. It features ±2% output voltage tolerance at 25 °C, 0.3 V typical dropout at full load, and thermal shutdown with hysteresis-designed for HDD read-channel and memory power rails.

For engineers reviewing the ST1L05PU25R datasheet, ST1L05PU25R pinout, ST1L05PU25R application, or ST1L05PU25R equivalent, key selection criteria include guaranteed 2.5 V output stability under 1.3 A load, compatibility with low-ESR ceramic capacitors (≥4.7 µF), enable functionality (not present in 'U' version), and thermal performance in compact DFN6 footprint for space-constrained storage subsystems.

Technical Context

The ST1L05PU25R is a non-adjustable, fixed 2.5 V variant of the ST1L05 family without Enable (EN) or Power Good (PG) pins-confirmed by pin configuration table showing EN/PG as N.C. Its internal bandgap reference and op-amp feedback loop deliver ±2% output accuracy over temperature and line/load variations, with dropout defined at IO = 1.3 A and VI ≥ VO + 0.5 V.

BiCMOS process enables ultra-low IQ control: 350–500 µA typical at 25 °C and up to 650 µA max across full operating range. Internal protection includes foldback current limiting, thermal shutdown at 165 °C with hysteresis, and stable operation with 4.7 µF ceramic output capacitance-no external compensation required.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5 V ±2% at 25 °C; ensures precise biasing for 2.5 V I/O interfaces in HDD controllers and memory ICs.
Max Output Current	1.3 A continuous; supports high-current digital blocks such as read channel ASICs without derating at TJ ≤ 125 °C.
Dropout Voltage	0.3 V typ. @ IO = 1.3 A; enables operation from 2.8 V input in battery-backed or low-voltage systems.
Quiescent Current	≤650 µA max over 0–125 °C; critical for always-on storage subsystems requiring ultra-low standby power.
Stability	Guaranteed with ≥4.7 µF X7R ceramic capacitor; eliminates need for tantalum or electrolytic output caps, reducing board area and cost.
Thermal Protection	Shutdown at 165 °C with hysteresis; prevents latch-up during transient overload and enables safe auto-recovery.
Operating Junction Temp	0 to 125 °C; validated for industrial-grade HDD and SSD controller environments.

Pinout & Package

ST1L05PU25R uses a thermally enhanced DFN6 (3×3 mm, 0.75 mm height) package with exposed pad tied to GND for optimal heat dissipation. Pin 1 is marked by chamfered corner; top-view pin numbering follows standard DFN convention.

Pin/Terminal	Circuit Role	Design Meaning
VI (Pin 6)	Input supply voltage	Accepts 3.3–5.25 V DC; requires 4.7 µF ceramic bypass to GND for stability and transient response.
VO (Pin 4)	Regulated output	Delivers fixed 2.5 V; must be decoupled with 4.7 µF ceramic cap to meet load transient specs (ΔVO ≤ 5% for 200 mA step).
GND (Pin 2)	Ground reference	Primary return path for input/output currents; connects to exposed thermal pad for R_thJC = 10 °C/W.
VO_SENSE (Pin 5)	Output voltage sense	Internal connection to feedback node; enables accurate regulation independent of PCB trace resistance.
N.C. (Pins 1,3)	No connect	Unbonded; must remain unconnected per design-no routing or pull-up/down allowed.

Key Features

Feature	Design Value
Fixed 2.5 V output	Eliminates external resistor divider, reducing BOM count and layout sensitivity for precision 2.5 V rail generation.
BiCMOS process	Enables 650 µA max IQ across full temp range-critical for low-power HDD standby modes and thermal management.
Low-ESR ceramic stability	Validated with 4.7 µF X7R MLCC; avoids aging, leakage, and size penalties of tantalum/electrolytic alternatives.
Thermal shutdown with hysteresis	165 °C trip + ~15 °C hysteresis ensures reliable recovery after overload without oscillation or system lockup.
Overcurrent protection	Foldback current limiting prevents damage during short-circuit events while maintaining safe junction temperature.

Applications

HDD Read Channel Power

SSD Controller Core Rail

Use Scenario: Powers analog front-end and ADC sections of hard disk drive read channel ICs requiring clean, stable 2.5 V.

IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.5 V bias to high-speed data acquisition circuitry.

Use Value: ±2% output tolerance and low noise (0.003%VO RMS) preserve signal integrity and SNR in sensitive analog paths.

Use Scenario: Supplies core logic voltage to NAND flash controller SoCs in solid-state drives operating at 2.5 V I/O standard.

IC Role / Device Role / Timing Role: Main 2.5 V power source for controller's interface logic and embedded memory peripherals.

Use Value: 1.3 A capability and 0.3 V dropout enable direct regulation from 2.8 V backup supplies during power-loss events.

Industrial Data Logger Memory

Embedded Storage Module

Use Scenario: Provides 2.5 V to serial NOR/NAND flash used in ruggedized data loggers with wide ambient temperature range.

IC Role / Device Role / Timing Role: Low-quiescent LDO supporting non-volatile memory retention during extended sleep cycles.

Use Value: 650 µA max IQ minimizes battery drain in battery-backed loggers, extending operational life >5 years.

Use Scenario: Integrated into compact M.2 or mSATA storage modules where board space and thermal envelope are constrained.

IC Role / Device Role / Timing Role: Space-optimized 2.5 V regulator on module PCB, leveraging DFN6 footprint and exposed pad cooling.

Use Value: DFN6 (3×3 mm) package with R_thJA = 55 °C/W allows full 1.3 A output without heatsink in 10 mm² footprint.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6219B252MR-G	2.5 V ±2%, 1.0 A max, IQ = 25 µA typ., DFN1006-4 package (1.0×0.6 mm)	Lower current rating and smaller package; unsuitable for 1.3 A HDD loads but ideal for ultra-compact IoT sensors.	Select when board area is primary constraint and load < 1.0 A; verify thermal margin with R_thJA = 250 °C/W.
ROHM BD3572FP-E2	2.5 V ±2%, 1.5 A max, IQ = 120 µA typ., HTSOP-J8 package (4.5×6.0 mm)	Larger footprint and higher thermal resistance (R_thJA = 60 °C/W); includes soft-start but no VO_SENSE pin.	Prefer for higher-current designs needing soft-start; avoid if DFN6 footprint or VO_SENSE accuracy is mandatory.

Compared with XC6219B252MR-G and BD3572FP-E2, ST1L05PU25R uniquely balances 1.3 A capability, 650 µA max IQ, VO_SENSE accuracy, and DFN6 thermal performance-making it the only option validated for industrial HDD read-channel power where all four attributes are simultaneously required.

Availability

ST1L05PU25R is available at Aetrix Electronics and suitable for HDD read-channel power, SSD controller core rails, industrial data logger memory, and embedded storage modules requiring stable component supply with long-lifecycle support.

Supply support for ST1L05PU25R 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The ST1L05 series belongs to ST's high-efficiency linear regulator product line, engineered specifically for data storage applications demanding ultra-low IQ, tight output tolerance, and robust thermal behavior in miniature packages.

FAQ

Is ST1L05PU25R pin-compatible with other ST1L05 variants like ST1L05BPUR?

No. ST1L05PU25R uses the base 'U' version pinout (VI, VO, GND, VO_SENSE, N.C., N.C.), whereas ST1L05BPUR has EN, PG, ADJ, and different pin assignments. The DFN6 footprint is identical, but signal mapping differs-direct replacement requires PCB redesign and validation of enable/power-good logic.

Can ST1L05PU25R operate with input voltage below 3.3 V?

Yes-minimum input is VO + V_d = 2.5 V + 0.5 V = 3.0 V per datasheet absolute maximum ratings and dropout curves. At 2.8 V input, output drops out of regulation; sustained operation requires VI ≥ 3.0 V with margin for line drop and ripple.

Does ST1L05PU25R require an external capacitor on the VO_SENSE pin?

No. VO_SENSE is an internal feedback node-not a user-accessible pin for external compensation. It connects directly to the internal op-amp inverter input; only VO and VI require 4.7 µF ceramic bypass capacitors per the application schematic.

What is the maximum allowable PCB copper area for the exposed thermal pad?

The DFN6 exposed pad (GND) should be soldered to a minimum 25 mm² copper pour with ≥4 thermal vias (0.3 mm diameter) to inner ground plane. Larger areas improve R_thJA, but 25 mm² meets the 55 °C/W spec; exceeding this yields diminishing returns without forced airflow.

ST1L05PU25R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 6-VDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 7V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 1.3A

Current - Output:: 1.3A

Current - Quiescent (Iq):: 650 µA

Current - Supply (Max):: -

PSRR:: 68dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-DFN (3x3)

ST1L05PU25R FAQ

1.How can I place an order for ST1L05PU25R through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1L05PU25R 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 ST1L05PU25R reliable?

The price and inventory of ST1L05PU25R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1L05PU25R is usually 5 days.

3.What payment methods are accepted for ST1L05PU25R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1L05PU25R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1L05PU25R?

ST1L05PU25R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1L05PU25R 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 ST1L05PU25R?

For technical support, including ST1L05PU25R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1L05PU25R requirements.

6.How does Aetrix verify that ST1L05PU25R is sourced from the original manufacturer or authorized distributors?

All ST1L05PU25R 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 ST1L05PU25R meets industry standards.

7.What is the process for return or replacement of ST1L05PU25R?

All ST1L05PU25R units undergo pre-shipment inspection (PSI). If there is an issue with ST1L05PU25R, 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 ST1L05PU25R part is unused and in its original packaging.

Return procedure for ST1L05PU25R:

1.Submit a request within 90 days.

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

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