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MIC5239-1.8YS
Microchip Technology
IC REG LIN 1.8V 500MA SOT223-3
1746 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 500mA SOT-223-3
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MIC5239-1.8YS
Product Overview
1317078
DiGi Electronics Part Number
MIC5239-1.8YS-DGManufacturer
Microchip Technology
MIC5239-1.8YS
Description
IC REG LIN 1.8V 500MA SOT223-3Inventory
1746 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 500mA SOT-223-3
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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MIC5239-1.8YS Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
Tube
Series
-
Product Status
Active
Output Configuration
Positive
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
30V
Voltage - Output (Min/Fixed)
1.8V
Voltage - Output (Max)
-
Voltage Dropout (Max)
0.35V @ 500mA (Typ)
Current - Output
500mA
Current - Quiescent (Iq)
45 µA
Current - Supply (Max)
15 mA
PSRR
-
Control Features
Enable
Protection Features
Over Current, Over Temperature, Over Voltage, Reverse Polarity
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-261-4, TO-261AA
Supplier Device Package
SOT-223-3
Base Product Number
MIC5239
Datasheet & Documents
HTML Datasheet
MIC5239-1.8YS-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
MIC523918YS
MIC5239-1.8YS-DG
576-2390
Standard Package
78
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
DiGi Electronics makes shopping affordable and eco-conscious, which I highly value.
Dec 02, 2025
The consistent quality of their after-sales service benefits our business greatly.
Dec 02, 2025
Their after-sales service ensures I always have a positive experience.
Dec 02, 2025
DiGi Electronics ensures timely updates that keep me informed every step of the way.
Dec 02, 2025
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Dec 02, 2025
They prioritize customer satisfaction with efficient and effective after-sales assistance.
Dec 02, 2025
The affordability of their products is unmatched. I found exactly what I needed at a fraction of the usual cost.
Dec 02, 2025
Their support team is attentive and always eager to help.
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Frequently Asked Questions (FAQ)
Can I use the MIC5239-1.8YS to replace a low-dropout regulator like the MCP1700-1.8 in a battery-powered IoT sensor node, and what are the key trade-offs in efficiency and thermal performance?
While both the MIC5239-1.8YS and MCP1700-1.8 provide 1.8V fixed output, direct replacement isn't recommended for ultra-low-power applications. The MIC5239-1.8YS has a higher quiescent current (45 µA typical) compared to the MCP1700’s 1.6 µA, which significantly increases standby power drain in battery-operated systems. Additionally, the MIC5239-1.8YS supports up to 30V input and 500mA load, making it over-spec’d for light loads, potentially leading to poorer light-load efficiency. However, it offers superior protection features (reverse polarity, over-voltage) and higher output current capability. If your design operates above 10mA average load and requires robust fault protection, the MIC5239-1.8YS is viable—but for long-life sensor nodes with microamp sleep currents, consider a dedicated ultra-low-Iq alternative instead.
What layout and thermal management considerations are critical when using the MIC5239-1.8YS in a compact PCB design with high ambient temperatures near 100°C?
The MIC5239-1.8YS in SOT-223-3 relies heavily on PCB copper pour for heat dissipation, especially at high ambient temperatures. At 100°C ambient and full 500mA load with a 5V input (3.2V dropout), power dissipation reaches ~1.6W, pushing the junction temperature close to its 125°C limit without adequate copper area. To mitigate this, dedicate a large ground-connected copper pad (≥ 2 in²) under the tab, use multiple thermal vias to an internal or bottom-layer ground plane, and avoid placing heat-sensitive components nearby. Also, ensure the input capacitor is within 5mm of the IN pin to maintain stability under thermal stress. Without proper thermal design, the device may trigger over-temperature shutdown during sustained operation, disrupting system reliability.
Is the MIC5239-1.8YS a suitable drop-in replacement for the older LM1117-1.8 in an industrial control board, and what design changes are needed to ensure reliability?
The MIC5239-1.8YS can replace the LM1117-1.8 in many cases, but it is not a true drop-in due to differing pinouts and thermal characteristics. The LM1117 uses a TO-220 or SOT-223 with a different pin configuration (ADJ/GND/Vout vs. IN/GND/EN), so PCB rework is required. Additionally, the MIC5239-1.8YS has a lower dropout voltage (0.35V vs. ~1.2V for LM1117 at 500mA), enabling operation at lower input voltages—advantageous in 3.3V-to-1.8V rails. However, the MIC5239 includes an enable pin and reverse polarity protection, which the LM1117 lacks, offering better fault resilience. Ensure the input capacitor meets the MIC5239’s stability requirements (typically 10µF low-ESR ceramic) and verify that the existing thermal pad can handle the improved but still limited SOT-223 dissipation. This swap improves efficiency and protection but requires layout validation.
How does the reverse polarity protection in the MIC5239-1.8YS work, and can I eliminate external protection diodes in a 24V industrial input application?
The MIC5239-1.8YS integrates true reverse polarity protection by using an internal P-channel MOSFET structure that blocks current flow when the input voltage is applied backwards. This allows it to withstand reverse voltages up to -30V without damage, eliminating the need for an external series diode in many 24V industrial systems. However, while the IC survives, the downstream circuitry may not—so if your load includes non-protected components, additional clamping or isolation may still be needed. Compared to solutions like the TPS7B6918 (which requires external diodes), the MIC5239-1.8YS simplifies BOM and reduces voltage drop. That said, during reverse events, the device draws no current, preserving battery life in portable variants. Verify system-level requirements: if full system protection is mandatory, combine with a TVS diode for transient suppression alongside the MIC5239-1.8YS’s inherent reverse-blocking capability.
What are the risks of using the MIC5239-1.8YS in a multi-rail power sequencing design where it must start before a 3.3V processor core, and how can I ensure reliable enable control?
Using the MIC5239-1.8YS in power sequencing requires careful attention to its enable (EN) pin logic thresholds and startup timing. The EN pin typically turns on around 1.2V, meaning it can activate before other system rails if left floating or weakly pulled. To ensure the 1.8V rail powers up before the 3.3V processor, tie the EN pin to a delayed or sequenced control signal—such as the output of a voltage supervisor or a GPIO from a boot-strapped microcontroller. Avoid connecting EN directly to VIN unless startup order is acceptable. Additionally, the MIC5239-1.8YS has a soft-start characteristic that limits inrush current, but under heavy capacitive loads (>100µF), output overshoot or delay may affect downstream timing. For mission-critical sequencing, use a dedicated power management IC with built-in sequencer outputs to drive the MIC5239-1.8YS’s EN pin, ensuring deterministic and reliable boot behavior across temperature and process variations.
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MIC5239-1.8YS CAD Models
Microchip Technology MIC5239-1.8YS PCB symbols & footprints
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