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LM5073MH
Texas Instruments
IC POE CNTRL 1 CHANNEL 14HTSSOP
1991 Pcs New Original In Stock
Power Over Ethernet Controller 1 Channel 802.3af (PoE) 14-HTSSOP
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5.0 / 5.0
- (513 Ratings)
LM5073MH
Product Overview
1323597
DiGi Electronics Part Number
LM5073MH-DGManufacturer
Texas Instruments
LM5073MH
Description
IC POE CNTRL 1 CHANNEL 14HTSSOPInventory
1991 Pcs New Original In Stock
Power Over Ethernet Controller 1 Channel 802.3af (PoE) 14-HTSSOP
Quantity
Minimum 1
Minimum 1
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LM5073MH Technical Specifications
Category
Power Management (PMIC), Power Over Ethernet (PoE) Controllers
Packaging
-
Series
-
Product Status
Obsolete
Type
Controller (PD)
Number of Channels
1
Power - Max
12.95 W
Internal Switch(s)
Yes
Auxiliary Sense
Yes
Standards
802.3af (PoE)
Voltage - Supply
9V ~ 70V
Current - Supply
2mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
14-PowerTSSOP (0.173", 4.40mm Width)
Supplier Device Package
14-HTSSOP
Base Product Number
LM5073
Datasheet & Documents
HTML Datasheet
LM5073MH-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
94
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Their inventory levels are maintained meticulously, ensuring no product shortages.
de desembre 02, 2025
The responsiveness of their customer support team is outstanding.
de desembre 02, 2025
Their customer service team is highly professional, providing clear and helpful information.
de desembre 02, 2025
Their customer support team is knowledgeable and always available after purchase.
de desembre 02, 2025
Great experience with quick processing and responsive support team.
de desembre 02, 2025
Shopping here is a breeze thanks to their affordable prices and courteous staff.
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Frequently Asked Questions (FAQ)
Can the LM5073MH be used as a drop-in replacement for the LTC4255 in a new 802.3af Power over Ethernet design, and what are the key compatibility risks?
The LM5073MH cannot serve as a direct replacement for the LTC4255 due to fundamental differences in control architecture and protection features. While both are 802.3af PoE PSE controllers, the LTC4255 includes integrated hot-swap MOSFET control and more comprehensive fault reporting, whereas the LM5073MH relies on external circuitry for full power path management. Designers risk under-protecting the power stage if substituting without reviewing overcurrent response and thermal shutdown behavior. Additionally, the LM5073MH is marked as obsolete, making long-term supply a significant risk for new designs. Consider instead the TI TPS23750 as a modern, supported alternative with improved integration and similar operating specs.
What are the main design-in risks when using the LM5073MH in a high-temperature industrial application near 125°C?
Using the LM5073MH at its maximum rated temperature of 125°C introduces several design-in risks, including reduced margin for thermal runaway in the external MOSFET and potential instability in the auxiliary power detection circuit. The device's internal leakage currents increase significantly near 125°C, which can affect the accuracy of the signature detection and classification stages. To mitigate, ensure adequate PCB copper for heatsinking the HTSSOP package, derate the maximum channel power to 10W instead of 12.95W, and verify operation with worst-case batch tolerances in both voltage and current sensing components.
How should I handle the auxiliary sense feature on the LM5073MH to avoid latch-up during cold-start conditions in PoE-powered devices?
The auxiliary sense pin on the LM5073MH must be carefully decoupled and filtered during cold-start to prevent false triggering or latch-up due to inrush transients. A common failure mode is connecting the auxiliary supply directly without a soft-start RC network, which can cause the internal comparator to oscillate during DC-DC converter startup. To avoid this, place a 100nF ceramic capacitor from the auxiliary sense pin to ground and use a series 10kΩ resistor from the auxiliary rail. Confirm that the auxiliary voltage rises monotonically and exceeds the 9V threshold only after the main power stage is stable.
Is the LM5073MH suitable for use in 802.3at (PoE+) systems requiring higher power delivery, and what limitations should be considered?
The LM5073MH is strictly limited to 802.3af (PoE) systems and is not suitable for 802.3at (PoE+) applications requiring up to 25.5W. It supports only up to 12.95W on a single channel and lacks the classification logic required for Type 2 PD negotiation. Attempting to use it in a PoE+ environment risks interoperability failures and potential damage under higher PSE sourcing conditions. Even with external augmentation, the device cannot signal for higher power classes. For PoE+ designs, consider upgrading to the TP S23881 or MAX5969B, which support Type 2 specifications and offer better integration.
What reliability concerns should be addressed when sourcing LM5073MH components for a long-lifecycle product given its obsolete status?
Designing with the obsolete LM5073MH introduces significant supply chain and field reliability risks. Since Texas Instruments no longer supports this part, current inventory is likely from resale or surplus channels, increasing exposure to counterfeit or out-of-spec units. Additionally, without ongoing manufacturing, there's no access to updated process improvements or reliability data. For long-lifecycle products, this raises the risk of premature end-of-support and costly redesigns. Mitigate by qualifying second sources like the Microchip PD70215 or transitioning to the active TI TPS23730, which offers IEEE 802.3af/at support and better protection features in a modern package.
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.
LM5073MH CAD Models
Texas Instruments LM5073MH PCB symbols & footprints
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