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

STMicroelectronics ST1L08SPU12R

Name: ST1L08SPU12R
Brand: STMicroelectronics
SKU: ST1L08SPU12R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1L08SPU12R

Manufacturer:: STMicroelectronics

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

Package:: 8-VFDFN Exposed Pad

Datasheet:: ST1L08SPU12R.pdf

Description:: IC REG LINEAR 1.2V 800MA 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:220

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Product details

Overview

ST1L08SPU12R from STMicroelectronics is a fixed-output 1.2 V, 800 mA ultra-low-dropout linear regulator (LDO) with Power Good and input voltage control features. It operates from 1–5.5 V input, delivers ≤90 mV dropout at full load, achieves ±2.0% output accuracy at 25 °C, and supports –40 °C to 125 °C junction temperature - ideal for point-of-load regulation in SSDs and battery-powered embedded systems.

For engineers reviewing the ST1L08SPU12R datasheet, ST1L08SPU12R pinout, ST1L08SPU12R application, or ST1L08SPU12R equivalent, key selection criteria include its dual-rail bias architecture (VIN/VBIAS), open-drain Power Good signaling, thermal/short-circuit protection, and DFN8 2×3 mm footprint compatibility with ceramic capacitor stabilization.

Technical Context

The ST1L08SPU12R uses an N-channel power pass transistor biased separately via VBIAS ≥ VOUT + 1.5 V, enabling ultra-low dropout while maintaining stability across wide input ranges. Its dual-input architecture decouples bias supply from main input, reducing ground current sensitivity and improving PSRR performance.

It integrates logic-controlled shutdown (EN pin), open-drain Power Good (PG) with 0.92×VOUT rising threshold and 0.8×VOUT falling threshold, plus internal current limiting (~1.8 A) and thermal shutdown at 165 °C with 20 °C hysteresis - all implemented without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 1.2 V ±2.0% at 25 °C - ensures stable core voltage for low-power microcontrollers and memory interfaces.
Max output current	800 mA guaranteed - sufficient for SoC core rails or multi-rail PMIC secondary outputs.
Dropout voltage	70 mV typ. / 90 mV max. @ 800 mA - enables operation from single-cell Li-ion (3.0 V min) down to 1.2 V output with >1.8 V headroom.
PSRR	80 dB @ 100 Hz, 50 dB @ 1 MHz - suppresses switching noise from upstream DC-DC converters in mixed-signal systems.
Ground current	35 µA typ. @ no load - minimizes quiescent drain in always-on battery backup domains.
Operating temp	–40 °C to 125 °C junction - qualified for industrial SSDs and automotive infotainment power stages.
Package	DFN8 2×3 mm with exposed pad - provides low thermal resistance (R_thJA = 55 °C/W) for compact, high-density PCB layouts.

Pinout & Package

ST1L08SPU12R is housed in a thermally enhanced DFN8 (2×3 mm) package with exposed pad (EXP) requiring GND connection for optimal thermal performance and EMI suppression.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Main input power rail	Accepts 1–5.5 V; supplies power element but not bias circuit - must be ≥ VOUT + 0.5 V for regulation.
VBIAS	Bias supply input	Provides gate drive for N-channel pass transistor; must be ≥ VOUT + 1.5 V and ≥ 2.7 V - can tie to VIN if compliant.
GND	Power and signal reference	Common return for VIN, VBIAS, EN, PG, and EXP pad - requires low-impedance plane connection.
EN	Enable control input	Active-high logic: <0.8 V = shutdown (I_Q < 1 µA), >1.3 V = active - compatible with 1.8 V/3.3 V GPIO.
PG	Power Good open-drain output	Asserts high when VOUT reaches 92% of target; pulls low at 80% - requires external pull-up for host monitoring.
VOUT	Regulated output	Delivers fixed 1.2 V; stabilized by ≥4.7 µF ceramic capacitor placed adjacent to pin per layout guidelines.
NC	No connect	Unbonded terminal - must remain unconnected and unpopulated on PCB.
EXP	Exposed thermal pad	Internally connected to GND; soldering to solid GND plane reduces R_thJA by ~20% and improves reliability.

Key Features

Feature	Design Value
Dual-rail input architecture	VIN and VBIAS separation allows independent optimization: VIN can be noisy/low-headroom, while VBIAS remains clean and stable.
Power Good with hysteresis	0.92×/0.8×VOUT thresholds prevent chatter during brown-out recovery - eliminates need for external supervisor IC.
Ultra-low quiescent current	35 µA typical at zero load - extends battery life in sleep-mode applications like portable SSDs and IoT sensors.
Thermal & short-circuit protection	Auto-recovery shutdown at 165 °C with 20 °C hysteresis and constant-current limit at ~1.8 A - prevents damage during fault conditions.
Ceramic capacitor stability	Stable with ≥1 µF input/output ceramic caps (ESR < 10 mΩ) - avoids tantalum or electrolytic dependencies and reduces BOM cost.

Applications

SSD Power Management

Battery-Powered MCU Core Rail

Use Scenario: Regulating 1.2 V core supply for NAND flash controllers in 2.5" SATA SSDs.

IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise VDDCORE with fast transient response to burst read/write loads.

Use Value: 70 mV dropout enables use of partially discharged Li-ion cells (down to ~2.5 V), extending usable battery capacity by >12% versus higher-dropout alternatives.

Use Scenario: Providing 1.2 V supply to ARM Cortex-M4/M7 cores in handheld medical devices.

IC Role / Device Role / Timing Role: Low-quiescent LDO supporting deep-sleep modes where system clock is gated but core retention voltage is maintained.

Use Value: 35 µA ground current at no load reduces standby power by 65% compared to standard 150 µA LDOs, enabling multi-week battery life.

Industrial Sensor Node PMIC

Automotive Infotainment SoC I/O Rail

Use Scenario: Generating 1.2 V for ADC/DAC reference and precision analog front-ends in wireless sensor transmitters.

IC Role / Device Role / Timing Role: Noise-sensitive analog LDO with 80 dB PSRR at 100 Hz to reject switching ripple from shared DC-DC converter.

Use Value: 50 µV_RMS output noise (10 Hz–100 kHz) preserves 16-bit ADC SNR without additional filtering.

Use Scenario: Supplying 1.2 V I/O domain for automotive-grade application processors in head-unit displays.

IC Role / Device Role / Timing Role: High-temp qualified LDO meeting AEC-Q100 Grade 2 (–40 °C to 105 °C ambient) with integrated PG for boot sequencing.

Use Value: PG output synchronizes FPGA configuration and display initialization, eliminating external reset supervisors and reducing BOM count.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B122MR-G	Fixed 1.2 V, 500 mA, 150 mV dropout, no VBIAS or PG pin - single-input architecture.	Lacks Power Good and bias rail; unsuitable for systems requiring precise power sequencing or low-headroom operation.	Select only if board space is constrained and PG/VBIAS functionality is omitted from design.
Analog Devices ADM7172ACPZ-1.2-R7	Fixed 1.2 V, 2 A, 175 mV dropout, 20 µV_RMS noise, no VBIAS - higher current but larger 10-lead LFCSP.	Higher PSRR (90 dB @ 100 Hz) but no PG or thermal hysteresis; requires larger PCB area and more expensive capacitors.	Prefer for ultra-low-noise RF biasing where 2 A current and 100 °C ambient suffice, but avoid for battery-constrained designs.

Compared with XC6210B122MR-G and ADM7172ACPZ-1.2-R7, the ST1L08SPU12R uniquely balances ultra-low dropout, integrated Power Good, dual-rail flexibility, and industrial temperature range in a compact DFN8 - making it optimal for space- and efficiency-critical embedded power nodes.

Availability

ST1L08SPU12R is available at Aetrix Electronics and suitable for SSD power management, battery-powered MCU core rails, industrial sensor node PMICs, and automotive infotainment SoC I/O rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ST1L08SPU12R 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 ST1L08 belongs to ST's high-performance LDO portfolio targeting low-noise, low-dropout, and thermally robust point-of-load regulation - developed specifically for next-generation storage, portable, and automotive electronics demanding high reliability under variable input conditions.

FAQ

What is the minimum required VBIAS voltage for ST1L08SPU12R?

The VBIAS pin requires ≥2.7 V and must be at least 1.5 V higher than VOUT (i.e., ≥2.7 V). For the 1.2 V output, VBIAS must be ≥2.7 V - typically supplied from a 3.3 V or 5 V rail. Tying VBIAS to VIN is acceptable only if VIN meets both conditions.

Can ST1L08SPU12R operate without an external pull-up on the PG pin?

No - the PG pin is an open-drain output and requires an external pull-up resistor (typically 10–100 kΩ to VBIAS or VCC) to assert HIGH during normal operation. Without it, PG remains floating and cannot signal valid output voltage to host controllers or sequencers.

Is the exposed pad (EXP) electrically connected internally?

Yes - the EXP pad is internally connected to GND. It must be soldered to a dedicated GND copper pour using ≥4 thermal vias to maximize heat dissipation and reduce R_thJA. Leaving it unconnected degrades thermal performance and risks premature thermal shutdown under load.

Does ST1L08SPU12R support adjustable output voltages?

No - ST1L08SPU12R is a fixed 1.2 V output variant. Adjustable versions (e.g., ST1L08SPUR) use the ADJ pin and external resistor divider; this part lacks ADJ functionality and has NC in that position per its pinout. Output voltage is factory-trimmed and non-configurable.

ST1L08SPU12R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-VFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.1V @ 800mA (Typ)

Current - Output:: 800mA

Current - Quiescent (Iq):: 35 µA

Current - Supply (Max):: -

PSRR:: 70dB ~ 30dB (100Hz ~ 1MHz)

Control Features:: Enable, Power Good

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN (2x3)

ST1L08SPU12R FAQ

1.How can I place an order for ST1L08SPU12R through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1L08SPU12R 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 ST1L08SPU12R reliable?

The price and inventory of ST1L08SPU12R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1L08SPU12R is usually 5 days.

3.What payment methods are accepted for ST1L08SPU12R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1L08SPU12R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1L08SPU12R?

ST1L08SPU12R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1L08SPU12R 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 ST1L08SPU12R?

For technical support, including ST1L08SPU12R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1L08SPU12R requirements.

6.How does Aetrix verify that ST1L08SPU12R is sourced from the original manufacturer or authorized distributors?

All ST1L08SPU12R 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 ST1L08SPU12R meets industry standards.

7.What is the process for return or replacement of ST1L08SPU12R?

All ST1L08SPU12R units undergo pre-shipment inspection (PSI). If there is an issue with ST1L08SPU12R, 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 ST1L08SPU12R part is unused and in its original packaging.

Return procedure for ST1L08SPU12R:

1.Submit a request within 90 days.

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

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