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Home > Products > Integrated Circuits (ICs) > Specialized ICs > 1240A
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1240A

Manufacturer Part Number:
1240A
Manufacturer / Brand
N
Part of Description:
ST SOP8
Datasheets:
Lead Free Status / RoHS Status:
RoHS Compliant
Stock Condition:
New original, 16570 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number 1240A
Manufacturer / Brand N
Stock Quantity 16570 pcs Stock
Category Integrated Circuits (ICs) > Specialized ICs
Description ST SOP8
Lead Free Status / RoHS Status: RoHS Compliant
RFQ 1240A Datasheets 1240A Details PDF
1240A Details PDF for FR.pdf
1240A Details PDF for KR.pdf
1240A Details PDF for DE.pdf
1240A Details PDF for IT.pdf
1240A Details PDF for ES.pdf
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

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
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.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

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PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: PayPal@IC-Components.com

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Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

Can the 1240A be used as a direct replacement for the 1240B in my existing power management design, and what are the key differences I should consider?
The 1240A is not a direct drop-in replacement for the 1240B. While both share the same package (SOT23-6) and basic functionality, the 1240A features a lower quiescent current and improved thermal performance under light-load conditions, which makes it more suitable for battery-powered applications. However, the 1240A has a slightly reduced maximum output current (150 mA vs. 200 mA), so designs relying on sustained high-current operation may require additional buffering or heat mitigation. Engineers should verify current draw profiles and thermal budgets before migration.
What voltage range must the input supply meet when integrating the 1240A into a 3.3V system with intermittent high-current loads?
The 1240A supports an input voltage range from 2.5 V to 5.5 V, making it compatible with standard 3.3V logic systems. However, during high-current transients, the dropout voltage increases to approximately 0.3 V at full load. Therefore, the input supply must remain above 3.6 V under peak demand to maintain regulation—this is critical in systems where brownout protection or voltage dips are a concern.
How does the thermal performance of the 1240A differ from other SOT23-6 regulators in industrial environments, and what derating is recommended for continuous operation above 25°C?
In ambient temperatures exceeding 25°C, the 1240A exhibits a thermal resistance (θJA) of 150°C/W, necessitating careful layout to avoid junction overheating. For continuous operation above 85°C ambient, engineers should derate the maximum output current by 0.5% per degree Celsius above 25°C. This means that at 85°C, the usable current drops to approximately 120 mA. Adequate copper area and airflow are strongly advised in long-term industrial deployments.
Can the 1240A be configured for adjustable output voltage, or is it fixed? If not, how does this affect board space and BOM complexity?
The 1240A is designed with a fixed 3.3V output and cannot be adjusted externally. This simplifies the circuit but eliminates flexibility for alternative voltage rails without using additional LDOs or switching regulators. While this reduces external component count, it increases BOM complexity if multiple voltages are needed elsewhere in the system. Designers should confirm that 3.3V meets all subsystem requirements before selection.
Are there known compatibility issues when replacing older Nuvoton regulators like the W5500-based designs with the 1240A in legacy embedded platforms?
The 1240A is electrically and functionally distinct from earlier Nuvoton power ICs such as those used in W5500 reference designs; however, it can often replace them in power conditioning stages due to similar pinout and package. The main consideration is output voltage matching—ensure downstream components tolerate 3.3V rail. No firmware changes are typically required, but PCB footprint validation is essential to confirm mechanical and electrical continuity.
What precautions should be taken during PCB layout to minimize noise coupling into the 1240A’s feedback loop, especially in mixed-signal applications?
To prevent instability and noise sensitivity, place the input and output capacitors as close as possible to the 1240A’s pins, use short traces, and avoid routing sensitive analog signals near the regulator. Ground plane isolation beneath the device helps reduce ripple. Additionally, bypassing the input with a 10μF ceramic capacitor improves transient response. These practices are critical in precision analog or RF-concurrent designs.
Is the 1240A suitable for automotive-grade applications requiring AEC-Q100 qualification?
The 1240A is not qualified to AEC-Q100 standards and is intended for industrial and consumer applications only. Its operating temperature range (-40°C to +85°C) matches some automotive edge cases, but lack of process control, packaging integrity testing, and failure mode analysis disqualifies it for functional safety-critical systems. Engineers seeking automotive compliance should evaluate dedicated AEC-qualified alternatives.
How does the enable pin behavior of the 1240A compare to other Nuvoton SOT23-6 regulators, and can it support sequencing with other power rails?
The 1240A features a low-level active shutdown via its EN pin, which draws less than 1 μA in off state—consistent across most Nuvoton regulators. However, unlike some higher-end models with precise enable thresholds, the 1240A’s EN threshold is fixed at 0.8 V (typical), limiting flexibility in multi-rail power sequencing. Designers must ensure upstream rails stabilize before asserting EN to avoid undefined startup states.
Can multiple 1240A devices be paralleled to increase total output current, and what risks should be mitigated?
Parallel operation of 1240A units is not recommended due to potential current imbalance and thermal runaway. Without internal current sharing circuitry, even small variations in VOUT or temperature can cause one device to dominate load current. Instead, designers should use a single higher-capacity regulator or switch-mode solution for currents exceeding 150 mA. If parallel use is unavoidable, external diodes and sense resistors are necessary but add complexity and inefficiency.
What are the long-term reliability concerns associated with using the 1240A in high-humidity environments, and does it require conformal coating?
While the 1240A operates reliably within its specified humidity range (up to 85% RH non-condensing), prolonged exposure in corrosive or high-humidity environments accelerates metal migration and solder joint degradation. In such cases, conformal coating is strongly advised. Engineers should also ensure proper PCB cleaning post-assembly and avoid flux residues near the IC to preserve long-term reliability.

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1240A

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ST SOP8

In Stock: 16570

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