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MIC2937A-3.3WU
Microchip Technology
IC REG LINEAR 3.3V 750MA TO263-3
2202 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 750mA TO-263-3
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5.0 / 5.0
- (157 Ratings)
MIC2937A-3.3WU
Product Overview
1323120
DiGi Electronics Part Number
MIC2937A-3.3WU-DGManufacturer
Microchip Technology
MIC2937A-3.3WU
Description
IC REG LINEAR 3.3V 750MA TO263-3Inventory
2202 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 750mA TO-263-3
Quantity
Minimum 1
Minimum 1
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MIC2937A-3.3WU 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)
26V
Voltage - Output (Min/Fixed)
3.3V
Voltage - Output (Max)
-
Voltage Dropout (Max)
-
Current - Output
750mA
Current - Quiescent (Iq)
300 µA
Current - Supply (Max)
16 mA
PSRR
-
Control Features
-
Protection Features
Over Current, Over Temperature
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Supplier Device Package
TO-263-3
Base Product Number
MIC2937
Datasheet & Documents
HTML Datasheet
MIC2937A-3.3WU-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
576-1131
MIC2937A33WU
Standard Package
50
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
고객센터의 응대가 매우 빠르고 친절해서 감동받았어요. 항상 만족스럽습니다.
de desembre 02, 2025
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de desembre 02, 2025
Their dedication to quality makes them my go-to supplier.
de desembre 02, 2025
Reliable shipping and exceptional product quality—definitely five stars.
de desembre 02, 2025
DiGi Electronics' support staff is always available, even outside regular business hours, which is very helpful.
de desembre 02, 2025
The logistics tracking system is one of the best I’ve experienced.
de desembre 02, 2025
DiGi Electronics truly demonstrates a first-class experience in electronics.
de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key thermal design considerations when using the MIC2937A-3.3WU in a surface-mount application with high ambient temperatures?
When using the MIC2937A-3.3WU in high ambient temperature environments (approaching 125°C), thermal performance becomes critical due to its linear regulation mechanism. The TO-263-3 package relies heavily on PCB copper as a heatsink—designers must allocate sufficient copper area (typically 1–2 in²) connected to the tab for thermal dissipation. Use thermal vias under the pad if multi-layer boards are available. Calculate power dissipation as (VIN - VOUT) × ILOAD; for example, at 12V input and 750mA load, ~6.5W is dissipated as heat. Without proper layout, the device will trigger over-temperature shutdown. Always simulate worst-case junction temperatures using θJA from the datasheet and derate current accordingly above 85°C ambient.
Can the MIC2937A-3.3WU reliably replace an LM1117-3.3 in an existing design, and what are the critical differences to watch for?
The MIC2937A-3.3WU can serve as a drop-in replacement for the LM1117-3.3 in many cases, but key differences impact reliability and performance. The MIC2937A-3.3WU offers better thermal shutdown response and lower minimum operating current, making it more stable with light loads. However, it has a higher quiescent supply current (16mA vs. ~5mA) which affects efficiency in battery-powered systems. Pin compatibility exists, but ensure the PCB layout supports the D2PAK thermal pad connection. Also verify input voltage—MIC2937A-3.3WU supports up to 26V, far exceeding the LM1117's 15V limit, offering headroom in unregulated supplies. Always revalidate stability and thermal margins when switching.
How does the MIC2937A-3.3WU handle transient load spikes in industrial control systems, and what output capacitance is recommended?
The MIC2937A-3.3WU includes internal compensation for stability but requires proper output capacitance to manage transient load steps typical in industrial PLCs or sensor modules. Use a minimum 22µF low-ESR tantalum or ceramic capacitor at the output, placed within 1 cm of the device. For fast transients (e.g., RF modules or ADC bursts), increase to 47µF with an additional 0.1µF ceramic in parallel to handle high-frequency demands. The regulator's transient response is slower than switching alternatives, so avoid pairing it with rapidly cycling loads without bulk capacitance. Poor layout or undersized caps can cause voltage droop and latch-up in downstream digital logic.
What risks arise when operating the MIC2937A-3.3WU near its maximum 26V input voltage in automotive environments with load dump events?
While the MIC2937A-3.3WU has a 26V absolute maximum input rating, automotive load dump transients (per ISO 7637-2) can exceed 40V for hundreds of milliseconds, posing a reliability risk. The MIC2937A-3.3WU lacks built-in transient voltage suppression, so operating near 26V without external protection (such as a TVS diode like SMAJ26A) may lead to permanent failure during load dump. Always derate input voltage—use 20V max as a safe design-in target. Pair the MIC2937A-3.3WU with a transient clamp and fuse for robust automotive integration. Monitor case temperature, as combined high VIN and load increases thermal stress.
Is the MIC2937A-3.3WU suitable for battery-powered IoT devices, and how does its quiescent current impact operational lifetime?
The MIC2937A-3.3WU is less ideal for long-life battery-powered IoT devices due to its relatively high 16mA maximum supply current (not including quiescent load). While output Iq is low (300µA), the control circuitry consumes significantly more than low-power LDOs like the TPS7A02 (1.3µA Iq). For always-on applications, this can drain small Li-ion or coin-cell batteries rapidly. Consider the MIC2937A-3.3WU only if load current is consistently above 100mA and thermal management is feasible. For duty-cycled IoT nodes, use an external MOSFET switch to disconnect power and avoid continuous drain. Evaluate lifetime with ∆V/I_total × battery capacity, factoring in shelf-life self-discharge.
Quality Assurance (QC)
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MIC2937A-3.3WU CAD Models
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