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Home > Products > Integrated Circuits (ICs) > Specialized ICs > LM1085ISX-3.3 /NOPB
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LM1085ISX-3.3 /NOPB

Manufacturer Part Number:
LM1085ISX-3.3 /NOPB
Manufacturer / Brand
TI
Part of Description:
936
Datasheets:
Lead Free Status / RoHS Status:
RoHS Compliant
Stock Condition:
New original, 4232 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number LM1085ISX-3.3 /NOPB
Manufacturer / Brand TI
Stock Quantity 4232 pcs Stock
Category Integrated Circuits (ICs) > Specialized ICs
Description 936
Lead Free Status / RoHS Status: RoHS Compliant
Condition New Original Stock
Warranty 100% Perfect Functions
Lead Time 2-3days after payment.
Payment Credit Card / PayPal / Telegraphic Transfer (T/T) / Western Union
Shipping by DHL / Fedex / UPS / TNT
Port HongKong
RFQ Email Info@IC-Components.com

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

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Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
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2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



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Frequently Asked Questions

What are the key thermal design considerations when using the LM1085ISX-3.3 /NOPB in a high-current, enclosed industrial enclosure with limited airflow?
The LM1085ISX-3.3 /NOPB, housed in a TO-263 package, has a junction-to-case thermal resistance (RθJC) of approximately 1.8°C/W. In high-current applications—especially above 1A—with restricted airflow, junction temperature can rise rapidly due to power dissipation (P = (Vin - Vout) × Iout). Without adequate heatsinking or forced convection, thermal shutdown may occur, even if the ambient temperature is within the rated range. Engineers should calculate worst-case power dissipation and ensure the total thermal resistance from junction to ambient remains below the required threshold to keep Tj under 125°C. A properly sized heatsink with thermal interface material is often necessary in enclosed systems.
Can the LM1085ISX-3.3 /NOPB be used as a direct drop-in replacement for the LM1084 in a legacy 5A power supply design?
While the LM1085ISX-3.3 /NOPB shares functional similarities with the LM1084, it is rated for a maximum output current of 3A, compared to the LM1084’s 5A capability. Direct substitution in a 5A design will result in current limiting, overheating, or premature failure. Additionally, the LM1085ISX-3.3 /NOPB has a fixed 3.3V output, whereas the LM1084 is adjustable. If the original design relied on adjustability or higher current headroom, a redesign involving component derating or alternative regulators (e.g., LM1084-3.3) would be required.
What input voltage range is safe for the LM1085ISX-3.3 /NOPB when operating near maximum load, and how does dropout voltage affect system efficiency?
The LM1085ISX-3.3 /NOPB requires a minimum input voltage of approximately 5.0V to maintain regulation at full load, corresponding to a dropout voltage of ~1.7V at 3A. Operating with Vin below this threshold causes the output to sag, leading to instability in downstream digital logic. For efficiency-critical applications, the power loss across the regulator increases linearly with (Vin - 3.3V), making high input voltages undesirable. Designers should balance input voltage selection between maintaining regulation and minimizing thermal stress.
How does the output capacitor selection impact stability and transient response in the LM1085ISX-3.3 /NOPB, and are ceramic capacitors suitable?
The LM1085ISX-3.3 /NOPB requires a minimum output capacitance of 10µF with an ESR between 0.1Ω and 0.3Ω for stability. Standard ceramic capacitors, while offering high capacitance and low ESR, may fall below the required ESR range, potentially causing oscillation. A 10µF tantalum or aluminum electrolytic capacitor is recommended. If using ceramics, a small series resistor (0.1–0.5Ω) may be needed to emulate ESR, or a parallel combination with a higher-ESR capacitor should be evaluated through transient load testing.
Is the LM1085ISX-3.3 /NOPB suitable for battery-powered systems where input voltage may drop below 5V during discharge?
The LM1085ISX-3.3 /NOPB is not ideal for battery-powered systems where the input voltage can fall below 5V, such as in 4.2V Li-ion or 3-cell NiMH configurations. Due to its ~1.7V dropout voltage, regulation fails when Vin drops below ~5.0V, making it incompatible with low-voltage battery rails. For such applications, a low-dropout regulator (LDO) with sub-1V dropout or a buck-boost converter should be considered instead.
What are the risks of paralleling multiple LM1085ISX-3.3 /NOPB devices to increase output current capability?
Paralleling LM1085ISX-3.3 /NOPB units without current-sharing techniques leads to unequal load distribution due to minor output voltage variations between units. The device with the slightly higher output voltage will carry disproportionate current, risking thermal runaway. Active current sharing using ballast resistors or external op-amp circuits can mitigate this, but increases complexity and reduces efficiency. For higher current needs, a single higher-current regulator is generally more reliable and cost-effective.
How does long-term reliability of the LM1085ISX-3.3 /NOPB compare in industrial environments with elevated ambient temperatures and thermal cycling?
The LM1085ISX-3.3 /NOPB is rated for operation from -40°C to +125°C junction temperature, making it suitable for industrial environments. However, sustained operation near maximum temperature with frequent thermal cycling accelerates bond wire fatigue and solder joint degradation, especially in TO-263 packages. Proper PCB layout with thermal vias, adequate copper pour, and mechanical mounting reduces stress. Derating output current by 10–20% at elevated ambient temperatures improves long-term reliability.
Can the LM1085ISX-3.3 /NOPB be used in reverse-polarity protection circuits without additional components?
No, the LM1085ISX-3.3 /NOPB lacks internal reverse-polarity protection. Applying a negative voltage to the input or output pins can damage the internal circuitry. In systems where reverse connection is possible—such as field-deployed equipment—an external blocking diode or MOSFET-based protection circuit must be added to prevent damage.
What layout practices are critical when designing a PCB for the LM1085ISX-3.3 /NOPB to minimize noise and ensure stable operation?
Critical layout practices include placing the input and output capacitors as close as possible to the respective pins, using short, wide traces to reduce parasitic inductance, and connecting the ground pin directly to a solid ground plane. The feedback node (if adjustable) should be routed away from noisy traces. For the fixed 3.3V version, ensure the internal feedback network is not disturbed by stray capacitance or interference. A star-ground configuration near the regulator helps minimize ground loops and improves transient response.

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LM1085ISX-3.3 /NOPB

TI

936

In Stock: 4232

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