LT4321HUF#PBF Analog Devices Integrated Circuit (Quad Flat No-Lead) In Stock
Analog Devices LT4321HUF#PBF is a Power-over-Ethernet ideal diode bridge controller PMIC. It manages PoE rectification with low forward voltage drop, housed in a 16-pin QFN package for compact powered-device designs.
- Manufacturer
- Analog Devices
- Package
- Quad Flat No-Lead
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- LT4321HUF#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $2.3000(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LT4321HUF#PBF?
- PoE ideal diode bridge controller replacing passive diode bridges to minimize forward-voltage power loss in IEEE 802.3 powered devices
- 16-pin QFN package with exposed thermal slug for efficient heat dissipation in high-current PoE applications
- Integrated gate-drive control for external MOSFETs enabling sub-100 mV forward drop versus conventional diode bridges
- Single-function design simplifies PoE front-end rectification circuitry in compact network equipment and IP cameras
What is LT4321HUF#PBF used for?
The LT4321HUF#PBF is designed for Power-over-Ethernet powered device (PD) front-end circuits in applications such as IP cameras, VoIP phones, wireless access points, and industrial IoT nodes. It replaces conventional rectifier diode bridges with active MOSFET switching, reducing power dissipation and improving efficiency at PoE input currents up to the IEEE 802.3af/at limits. The compact 16-pin QFN with exposed thermal pad integrates easily into space-constrained PoE PD reference designs.
What are the specifications of LT4321HUF#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1692 |
| YTEOL | 10 |
| Analog IC - Other Type | ANALOG CIRCUIT |
| JESD-30 Code | S-PQCC-N16 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Voltage-Max (Vsup) | 80V |
| Supply Voltage-Min (Vsup) | 20V |
| Supply Voltage-Nom (Vsup) | 55V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.65mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| ## LT4321HUF#PBF Alternates Showing results | Image |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the LT4321HUF#PBF datasheet?
LT4321HUF#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LT4321HUF#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the LT4321HUF#PBF improve on a conventional diode bridge rectifier in PoE designs?
The LT4321HUF#PBF uses active MOSFET switching to replace passive diode bridges, reducing forward voltage drop to below 100 mV per switch compared to approximately 600 mV for a standard silicon diode. This lowers heat dissipation and allows more power to reach the load, especially critical in Class 3 and Class 4 PoE applications carrying up to 30 W.
What package does the LT4321HUF#PBF use, and does it support thermal management?
The LT4321HUF#PBF is housed in a 16-pin QFN package with a bottom-side exposed thermal slug. The slug can be soldered directly to a PCB copper pour, providing a low-resistance thermal path that helps manage junction temperatures during continuous PoE current delivery and maintains reliable operation across the -40°C to +125°C industrial temperature range.
In which PoE powered-device applications is the LT4321HUF#PBF commonly used?
Typical applications include IEEE 802.3af/at powered devices such as IP security cameras, VoIP handsets, wireless LAN access points, and PoE-powered industrial sensors. The device controls rectification at the PD front end, ensuring polarity-independent input handling and efficient power delivery at voltages ranging from 36 V to 57 V over the Ethernet cable.
Does the LT4321HUF#PBF come in a lead-free version, and what does the PBF suffix mean?
The PBF suffix in LT4321HUF#PBF designates a lead-free, RoHS-compliant package using tin-silver-copper solder finishes, complying with European Union RoHS directives and suitable for reflow soldering at peak temperatures above 260°C. This makes it compatible with modern lead-free assembly processes in manufacturing facilities targeting global regulatory compliance.
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Why Buy from FindMyChip
About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $6.5200 | $6.52 |
| 2+ | $6.0000 | $12.00 |
| 10+ | $4.3120 | $43.12 |
| 19+ | $3.0500 | $57.95 |
| 1000+ | $2.3000 | $2300.00 |
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