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MIC38C42ABMM
Microchip Technology
IC OFFLINE SWITCH MULT TOP 8MSOP
3772 Pcs New Original In Stock
Converter Offline Boost, Buck, Flyback, Forward Topology 500kHz 8-MSOP
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5.0 / 5.0
- (424 Ratings)
MIC38C42ABMM
Product Overview
1299713
DiGi Electronics Part Number
MIC38C42ABMM-DGManufacturer
Microchip Technology
MIC38C42ABMM
Description
IC OFFLINE SWITCH MULT TOP 8MSOPInventory
3772 Pcs New Original In Stock
Converter Offline Boost, Buck, Flyback, Forward Topology 500kHz 8-MSOP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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365 - Day Quality Guarantee - Every part fully backed.
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MIC38C42ABMM Technical Specifications
Category
Power Management (PMIC), AC DC Converters, Offline Switches
Packaging
Bulk
Series
-
Product Status
Discontinued at Digi-Key
Output Isolation
Isolated
Internal Switch(s)
Yes
Voltage - Breakdown
-
Topology
Boost, Buck, Flyback, Forward
Voltage - Start Up
14.5 V
Voltage - Supply (Vcc/Vdd)
9V ~ 20V
Duty Cycle
96%
Frequency - Switching
500kHz
Fault Protection
-
Control Features
Frequency Control
Operating Temperature
-40°C ~ 150°C (TJ)
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package
8-MSOP
Mounting Type
Surface Mount
Base Product Number
MIC38C42
Datasheet & Documents
HTML Datasheet
MIC38C42ABMM-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
100
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Livraison toujours dans les délais, et un support client très agréable et compétent.
Dec 02, 2025
価格が手頃で、サポートも迅速に対応してくれるので頼りにしています。
Dec 02, 2025
Fast and dependable delivery makes their service stand out in the electronics market.
Dec 02, 2025
Delivery speed is exceptional, reducing wait times significantly.
Dec 02, 2025
Their shipment notifications are accurate, and packages always arrive securely and promptly.
Dec 02, 2025
Their reliable logistics tracking system made sure I was never in the dark about my order’s whereabouts.
Dec 02, 2025
The speed at which I receive my orders makes a significant difference during critical repair windows.
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Frequently Asked Questions (FAQ)
Can the MIC38C42ABMM be used as a drop-in replacement for the ON Semiconductor NCP1027 in a flyback converter design, and what critical layout or biasing adjustments are needed?
The MIC38C42ABMM is not a direct drop-in replacement for the NCP1027 due to key differences in startup voltage (14.5V vs. ~8.5V), supply range (9–20V vs. 4.5–10V), and internal oscillator architecture. While both support flyback topologies, the MIC38C42ABMM requires a higher auxiliary winding voltage to maintain Vcc, which may necessitate redesigning the transformer turns ratio. Additionally, the 500kHz fixed frequency of the MIC38C42ABMM versus the frequency foldback behavior of the NCP1027 under light load affects efficiency and EMI profiles. Careful review of gate drive timing and feedback loop compensation is essential—especially since the MIC38C42ABMM lacks built-in soft-start, increasing inrush current risk during startup.
What are the thermal and reliability risks when operating the MIC38C42ABMM near its maximum junction temperature of 150°C in an enclosed industrial power supply?
Operating the MIC38C42ABMM near 150°C significantly accelerates electromigration and oxide degradation, reducing long-term reliability even if within datasheet limits. In enclosed environments with poor airflow, thermal runaway risk increases due to positive feedback between Rds(on) and temperature. We recommend derating the device to ≤125°C TJ and ensuring PCB copper area under the 8-MSOP package acts as a heat spreader. Use thermal vias and avoid placing heat-sensitive components nearby. Given the MIC38C42ABMM’s discontinued status, consider qualifying a second-source alternative like the TI UCC28C42 early to mitigate supply chain risk in mission-critical applications.
How does the 96% maximum duty cycle of the MIC38C42ABMM impact transformer design in a wide-input-range buck-boost application, and what saturation risks should be mitigated?
The 96% duty cycle of the MIC38C42ABMM allows near-full conduction but leaves minimal off-time for transformer reset in buck-boost or flyback configurations, increasing core saturation risk—especially at low line voltages. This demands careful selection of core material (e.g., ferrite with high Bsat) and inclusion of a reset winding or active clamp circuit. In boost mode, the extended on-time reduces ripple current handling margin; ensure inductor saturation current exceeds peak switch current by ≥30%. Always validate worst-case volt-second balance in simulation, as marginal designs may pass bench tests but fail under transient load or input dips.
Is it safe to parallel multiple MIC38C42ABMM controllers for higher output current, and what synchronization or current-sharing challenges arise?
Paralleling MIC38C42ABMM devices is not recommended due to lack of current-sharing features, master-slave sync capability, or matched propagation delays. Each unit operates independently at 500kHz, leading to beat frequencies, uneven thermal distribution, and potential shoot-through if gate drives overlap. Even minor timing skews cause one device to carry disproportionate load, accelerating localized heating. For higher power needs, use a single controller with an external MOSFET (e.g., MIC38C42ABMM driving a discrete FET via a driver IC) or migrate to a dedicated multi-phase controller like the Microchip MCP19118, which includes integrated current balancing.
Given that the MIC38C42ABMM is discontinued at Digi-Key and RoHS non-compliant, what compliant and available alternatives support similar multi-topology operation with minimal firmware or hardware changes?
For RoHS-compliant, readily available alternatives to the MIC38C42ABMM, consider the Texas Instruments UCC28C42 (8-SOIC, 500kHz, supports flyback/forward) or the ON Semiconductor NCP1252 (SOIC-8, 65–130kHz adjustable, but requires frequency retuning). Both offer better supply chain availability and modern protection features. However, the UCC28C42 matches the MIC38C42ABMM’s voltage ranges and topology flexibility more closely, easing migration. If your design uses frequency control, note that the MIC38C42ABMM’s analog modulation interface differs from PWM-based modern controllers—verify compatibility with your feedback network. Always revalidate compensation networks and startup behavior, as control loop dynamics vary significantly between generations.
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.
MIC38C42ABMM CAD Models
Microchip Technology MIC38C42ABMM PCB symbols & footprints
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