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MIC37139-1.8YS
Microchip Technology
IC REG LINEAR 1.8V 1.5A SOT223-3
1678 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1.5A SOT-223-3
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5.0 / 5.0
- (265 Ratings)
MIC37139-1.8YS
Product Overview
1330241
DiGi Electronics Part Number
MIC37139-1.8YS-DGManufacturer
Microchip Technology
MIC37139-1.8YS
Description
IC REG LINEAR 1.8V 1.5A SOT223-3Inventory
1678 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 1.5A SOT-223-3
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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MIC37139-1.8YS Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
-
Series
-
Product Status
Obsolete
Output Configuration
Positive
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
6V
Voltage - Output (Min/Fixed)
1.8V
Voltage - Output (Max)
-
Voltage Dropout (Max)
0.5V @ 1.5A
Current - Output
1.5A
PSRR
-
Control Features
-
Protection Features
Over Current, Over Temperature, 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
MIC37139
Datasheet & Documents
HTML Datasheet
MIC37139-1.8YS-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
576-2257
MIC37139-1.8YS-DG
MIC3713918YS
Standard Package
78
Alternative Parts
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MANUFACTURER
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UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
包裝非常堅實，完全沒有受損的情況，值得收藏與推薦。
de desembre 02, 2025
La durabilité et la performance des produits de Di Digi Electronics sont remarquables, ils tiennent leurs promesses.
de desembre 02, 2025
DiGi Electronics' robust support infrastructure reassures us during critical phases.
de desembre 02, 2025
I appreciate their professional approach to after-sales support, ensuring that I was completely satisfied after purchase.
de desembre 02, 2025
Their products are compatible with various third-party modules, thanks to precise manufacturing.
de desembre 02, 2025
We greatly appreciate their attentive after-sales care and support.
de desembre 02, 2025
Shipping was rapid, and the well-padded packaging meant no worries about damage.
de desembre 02, 2025
I've experienced steady support and consistent quality in all my interactions with them.
de desembre 02, 2025
The affordability of their products allows me to stay up-to-date with the latest technology.
de desembre 02, 2025
Their stock completeness and post-sale support are unmatched in the industry.
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Frequently Asked Questions (FAQ)
Can I still use the MIC37139-1.8YS in a new design even though it's marked as obsolete by Microchip?
No, you should not use the MIC37139-1.8YS in new designs due to its obsolete status, which means Microchip no longer supports it with updates, reliability data, or lifecycle guarantees. While existing inventory may function, future availability is unreliable, and there’s increased risk of counterfeit parts. For new designs, migrate to a recommended substitute like the ADP3339AKCZ-1.8-RL or LM1117MPX-1.8/NOPB, which offer similar 1.8V fixed output and 1.5A capability with active manufacturer support and better long-term supply chain stability.
What are the key risks when replacing the MIC37139-1.8YS with the ADP3339AKCZ-1.8-RL in an existing SOT-223-3 footprint?
The primary risk when replacing the MIC37139-1.8YS with the ADP3339AKCZ-1.8-RL lies in dropout voltage and thermal performance differences. The ADP3339 has a lower dropout voltage (0.4V typical at 1.5A vs. 0.5V max for the MIC37139), which improves efficiency but may expose marginal input voltage conditions previously masked by the higher dropout. Additionally, ensure your PCB layout can handle the ADP3339’s slightly different thermal resistance (θJA ~50°C/W vs. ~60°C/W for MIC37139). Verify input/output capacitor ESR requirements—ADP3339 demands low-ESR ceramics (<0.3Ω), while MIC37139 is more tolerant—failing to meet this can cause instability.
How do I manage thermal performance when using the MIC37139-1.8YS at full 1.5A load in a compact PCB layout?
At 1.5A output, the MIC37139-1.8YS can dissipate up to 0.75W (with 6V input), requiring careful thermal design. Without a heatsink, the SOT-223-3 package relies on PCB copper pour for heat spreading. Use a minimum 1 in² of 2 oz copper connected to the tab (pin 2) on both top and inner layers, and add multiple thermal vias. Operating near 125°C junction temperature risks triggering overtemperature shutdown—monitor ambient temperature and derate current above 85°C. Consider airflow or switching to a more efficient LDO like the ADP3339 if thermal headroom is insufficient.
Is the MIC37139-1.8YS safe to use in reverse-polarity scenarios, and how does its protection compare to modern alternatives?
Yes, the MIC37139-1.8YS includes built-in reverse polarity protection, which prevents damage if the input voltage is accidentally reversed—a valuable feature in industrial or field-deployed systems. However, this protection is passive and dissipative, increasing thermal stress during fault conditions. Modern replacements like the ADP3339AKCZ-1.8-RL lack integrated reverse polarity protection, requiring an external blocking diode or MOSFET circuit. If your application involves untrusted power sources, retaining reverse polarity robustness may justify adding external protection even when migrating to a newer regulator.
What input voltage margin should I maintain above 1.8V when designing with the MIC37139-1.8YS to ensure stable regulation under all conditions?
To ensure reliable operation of the MIC37139-1.8YS, maintain at least 0.6V above the 1.8V output (i.e., ≥2.4V input) under worst-case conditions. Although the datasheet specifies a maximum dropout of 0.5V at 1.5A, real-world factors like input ripple, line transients, and temperature variation can increase effective dropout. Operating too close to the limit risks output droop during load steps or startup. For robust designs—especially with battery-powered or noisy supplies—design for 2.7V minimum input to provide margin and avoid entering dropout, which degrades PSRR and regulation accuracy.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
MIC37139-1.8YS CAD Models
Microchip Technology MIC37139-1.8YS PCB symbols & footprints
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