MP3921GU-P is available for purchase but is not normally stocked.
Available Substitutes:

Direct

MP3921GU-Z
Monolithic Power Systems Inc.
In Stock: 0
Unit Price: £2.02000
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New at DigiKey
32-QFN (5x5)
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MP3921GU-P

DigiKey Part Number
1589-MP3921GU-PTR-ND - Tape & Reel (TR)
Manufacturer
Monolithic Power Systems Inc.
Manufacturer Product Number
MP3921GU-P
Description
SINGLE-PORT, IEEE 802.3AF/AT PSE
Manufacturer Standard Lead Time
12 Weeks
Customer Reference
Detailed Description
Power Over Ethernet Controller 1 Channel 802.3at (PoE+), 802.3af (PoE) 32-QFN (5x5)
Product Attributes
Type
Description
Select All
Category
Manufacturer
Monolithic Power Systems Inc.
Series
-
Packaging
Tape & Reel (TR)
Part Status
Active
Type
Controller (PD)
Number of Channels
1
Power - Max
40 W
Internal Switch(s)
No
Auxiliary Sense
No
Standards
802.3at (PoE+), 802.3af (PoE)
Voltage - Supply
44V ~ 57V
Current - Supply
2mA
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
32-VFQFN Exposed Pad
Supplier Device Package
32-QFN (5x5)
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Available To Order
Check Lead Time
Quantity
All prices are in GBP
Tape & Reel (TR)
QuantityUnit PriceExt Price
500£1.28814£644.07
1,000£1.25067£1,250.67
1,500£1.23191£1,847.87
2,500£1.21111£3,027.77
3,500£1.19896£4,196.36
5,000£1.18727£5,936.35
Manufacturers Standard Package
Unit Price without VAT:£1.28814
Unit Price with VAT:£1.54577