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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

STMicroelectronics STLA01PUR

Name: STLA01PUR
Brand: STMicroelectronics
SKU: STLA01PUR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STLA01PUR

Manufacturer:: STMicroelectronics

Category:: LED Drivers

Package:: 6-WFDFN Exposed Pad

Datasheet:: STLA01PUR.pdf

Description:: IC LED DRIVER LINEAR 50MA 6DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STLA01PUR from STMicroelectronics is a standalone linear constant-current LED driver IC designed for single-LED biasing in portable systems. It delivers programmable LED current up to 50 mA with ±5% accuracy, operates from 3.75 V to 6 V supply, and features shutdown mode with ≤10 µA quiescent current. Its DFN6 (2 × 2 mm) package enables compact integration in space-constrained lighting modules.

For engineers reviewing the STLA01PUR datasheet, STLA01PUR pinout, STLA01PUR application, or STLA01PUR equivalent, key selection criteria include programmable current accuracy, no external sense resistor requirement, thermal performance under varying R_PROG, EN pin logic thresholds, and PCB thermal pad layout guidance for sustained 50 mA operation.

Technical Context

The STLA01PUR implements a precision current-sink topology where LED current is set by an external resistor (R_PROG) connected between PROG and GND, with I_LED = 100 × (1.22 V / R_PROG). The internal reference voltage at PROG is tightly regulated at 1.22 V (±1.6%) across temperature.

Enable control is implemented via a dedicated EN pin with 0.92 V typical high-threshold and 120 mV hysteresis; pulling EN below 0.80 V forces full shutdown. The device integrates a low-R_ON (8 Ω typ.) power FET between VCC and LED, eliminating external switching components.

Key Specifications

Parameter	Value and Actual Design Meaning
LED Current Range	2 mA to 50 mA, programmable via single R_PROG; supports dimming and multi-level brightness control
Current Accuracy	±5% over -40°C to +85°C; ensures consistent LED luminance without calibration
Supply Voltage	3.75 V to 6 V; compatible with single-cell Li-ion (fully charged) and dual-cell alkaline inputs
Shutdown Current	≤10 µA at T_J = 25°C; enables ultra-low-power standby in battery-powered devices
PROG Pin Voltage	1.22 V ±1.6%; stable reference enabling accurate current programming independent of VCC
EN Threshold High	0.92 V min; ensures reliable turn-on even with weak pull-ups or noisy control lines
R_ON (VCC–LED)	8 Ω typ.; limits voltage drop to <400 mV at 50 mA, minimizing power loss and heat generation

Pinout & Package

STLA01PUR is housed in a thermally enhanced DFN6 (2 × 2 mm) package with exposed thermal pad. The pad must be soldered to PCB ground plane to achieve R_thJA = 100°C/W and sustain full 50 mA output.

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Ground reference	Primary return path for LED current and internal circuitry; connects to exposed thermal pad
2 NC	No connect	Internally unconnected; must remain floating or grounded per layout guidelines
3 LED	Current-sink output	Drives cathode of single LED; voltage compliance up to 7 V allows use with white/blue LEDs
4 VCC	Power input	Supplies internal regulator and power FET; requires ≥1 µF ceramic bypass capacitor
5 PROG	Current programming	High-impedance reference node; sets I_LED = 100 × (1.22 V / R_PROG)
6 EN	Enable control	Active-high digital input; <0.80 V disables output and reduces ICC to ≤10 µA

Key Features

Feature	Design Value
No external sense resistor	Reduces BOM count and PCB area; eliminates resistor tolerance and thermal drift errors
Programmable current via single resistor	Enables precise, production-tunable LED brightness without trimming or firmware
Thermally optimized DFN6 package	Exposed pad + copper pour achieves 100°C/W junction-to-ambient, supporting continuous 50 mA
Low shutdown current	Extends battery life in always-on portable devices such as medical indicators or wearables
Integrated power FET	Eliminates need for external MOSFET and gate driver, simplifying layout and reducing EMI risk

Applications

Smartphone Status Indicator

Portable Medical Device Display Backlight

Use Scenario: Single-color LED indicator for charging status, notification, or system activity on compact handhelds.

IC Role / Device Role / Timing Role: Constant-current sink controlling LED brightness independent of forward voltage variation.

Use Value: Ensures uniform visual output across battery discharge cycle (3.75–4.2 V), eliminating brightness droop.

Use Scenario: Low-power backlight for segmented LCDs in battery-operated diagnostic tools or patient monitors.

IC Role / Device Role / Timing Role: Precision current source delivering stable luminance during intermittent display activation.

Use Value: Maintains calibrated light intensity over temperature (-40°C to +85°C), critical for clinical readability.

Industrial Handheld Scanner UI

Wearable Fitness Tracker LED

Use Scenario: Status LED ring around scan window indicating ready/idle/error states in rugged field equipment.

IC Role / Device Role / Timing Role: Robust current driver immune to supply ripple from motor or RF interference.

Use Value: Delivers consistent optical signaling despite 3.75–6 V input variation and transient load noise.

Use Scenario: Pulse-based heart-rate sensor LED driver requiring precise, repeatable current pulses.

IC Role / Device Role / Timing Role: Fast-enable current sink synchronized to photodiode sampling windows.

Use Value: Enables sub-1% current pulse-to-pulse variation for accurate PPG signal acquisition.

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8805W50-7	Switching buck architecture; higher efficiency (>90%) but requires inductor and diode	Better suited for multi-LED strings or >50 mA loads; less suitable for ultra-compact single-LED designs	Select when input voltage exceeds 6 V or thermal budget is extremely tight
AP3601B-TRG1	Linear driver with 60 mA max; uses internal reference (no R_PROG), fixed 20/30/40/60 mA options	Lacks programmability; requires different part numbers for each current level, increasing inventory complexity	Select only when fixed-current variants align exactly with design requirements and R_PROG flexibility is unnecessary

Compared with AL8805W50-7 and AP3601B-TRG1, STLA01PUR uniquely balances programmability, minimal external components, and thermal efficiency in a 2×2 mm footprint-making it optimal for cost-sensitive, space-constrained single-LED applications where input stays within 3.75–6 V.

Availability

STLA01PUR is available at Aetrix Electronics and suitable for smartphone status indicators, portable medical device displays, industrial handheld scanners, and wearable fitness trackers requiring stable component supply and long-term manufacturability.

Supply support for STLA01PUR 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 products for industrial, automotive, and consumer markets.

The STLA01 series belongs to ST's LED driver product line, engineered specifically for low-voltage, single-LED biasing in portable electronics where board space, bill-of-materials simplicity, and thermal efficiency are critical.

FAQ

What is the minimum recommended R_PROG value for stable 50 mA operation?

The datasheet specifies R_PROG = 2.4 kΩ for 50 mA nominal output. Using lower values risks exceeding the PROG pin current limit (800 µA) and may cause regulation error or thermal stress. ST recommends staying within 2.4–65 kΩ range for guaranteed performance across temperature.

Can STLA01PUR drive multiple LEDs in series?

No. STLA01PUR is explicitly designed for single-LED configurations. Its LED pin has a maximum voltage rating of 7 V and lacks the headroom or topology to support series strings. Attempting to drive multiple LEDs may exceed V_LED rating and cause failure.

Is the exposed thermal pad electrically connected internally?

Yes-the exposed pad is internally connected to GND. It must be soldered to a PCB copper pour tied to system ground to ensure both electrical safety and optimal thermal performance (R_thJA = 100°C/W). Floating the pad degrades thermal resistance significantly.

How does EN pin hysteresis improve system reliability?

The 120 mV hysteresis prevents oscillation during slow-rising or noisy enable signals near the threshold. This avoids unintended toggling between active and shutdown states, ensuring clean transitions and eliminating LED flicker or supply current spikes in marginal control environments.

STLA01PUR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 6-WFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Linear

Topology:: -

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 3.75V

Voltage - Supply (Max):: 6V

Voltage - Output:: -

Current - Output / Channel:: 50mA

Frequency:: -

Dimming:: -

Applications:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-DFN (2x2)

STLA01PUR FAQ

1.How can I place an order for STLA01PUR through Aetrix?

Please submit a Request for Quotation (RFQ) for STLA01PUR 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 STLA01PUR reliable?

The price and inventory of STLA01PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLA01PUR is usually 5 days.

3.What payment methods are accepted for STLA01PUR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLA01PUR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STLA01PUR?

STLA01PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STLA01PUR 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 STLA01PUR?

For technical support, including STLA01PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLA01PUR requirements.

6.How does Aetrix verify that STLA01PUR is sourced from the original manufacturer or authorized distributors?

All STLA01PUR 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 STLA01PUR meets industry standards.

7.What is the process for return or replacement of STLA01PUR?

All STLA01PUR units undergo pre-shipment inspection (PSI). If there is an issue with STLA01PUR, 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 STLA01PUR part is unused and in its original packaging.

Return procedure for STLA01PUR:

1.Submit a request within 90 days.

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

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