Analog Devices LTC4291IUF
LTC4291IUF variants from Analog Devices
LTC4291IUF Overview
What changes between part numbers, and what to check before you lock the BOM — Power over Ethernet Controllers.
LTC4291IUF is a Analog Devices order-code family — not a single orderable MPN. This page lists 3 variants that share the same core device but differ in suffix fields (package, grade, reel/tube, electrical bin, etc.). Pick the exact full part number; substituting within the family without checking the datasheet often causes assembly or spec mismatches.
Package: 24-WFQFN Exposed Pad | Mounting Type: Surface Mount | Supply Voltage: 3V ~ 3.6V | Number of Channels: 8 | Operating Temperature: -40°C ~ 85°C Other listed variants describe: IC POE CNTRL 8 CHANNEL 24QFN.
Across listed variants, watch these parameters: packages: 24-WFQFN Exposed Pad.
Suffix examples in this family: #PBF, #TRPBF, 1#TRPBF. The characters after the base number usually encode package, temperature, or performance grade — compare the variant table column-by-column rather than assuming pin-compatible drops-in.
Example MPNs: LTC4291IUF#PBF, LTC4291IUF#TRPBF, LTC4291IUF-1#TRPBF.
Key Features
- Footprint / package: 24-WFQFN Exposed PadSingle package option across listed variants; still confirm reel vs tube suffix if you auto-insert.
- Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
- 3 distinct suffix patternsExamples: #PBF, #TRPBF, 1#TRPBF. Decode suffix meaning in the ordering notes under the variant table.
Target Applications
- Power over Ethernet Controllers — design-in and field replacement
- BOM scrub where only the base prefix is known but suffix is TBD
- Second-source checks when the original MPN is constrained
Ordering Variants
Compare 3 LTC4291IUF part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.
| Part Number | Description | Package Type | Manufacturer | Lifecycle | RoHS | Availability | Action |
|---|---|---|---|---|---|---|---|
| LTC4291IUF#PBF | Package: 24-WFQFN Exposed Pad | Mounting Type: Surface Mount | Supply Voltage: 3V ~ 3.6V | Number of Channels: 8 | Operating Temperature: -40°C ~ 85°C | 24-WFQFN Exposed Pad | Analog Devices | Active | Compliant | In Stock | |
| LTC4291IUF#TRPBF | Package: 24-WFQFN Exposed Pad | Mounting Type: Surface Mount | Supply Voltage: 3V ~ 3.6V | Number of Channels: 8 | Operating Temperature: -40°C ~ 85°C | 24-WFQFN Exposed Pad | Analog Devices | Active | Compliant | In Stock | |
| LTC4291IUF-1#TRPBF | IC POE CNTRL 8 CHANNEL 24QFN | - | Analog Devices | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on LTC4291IUF map to package, grade, and reel options.
LTC4291IUF uses a shared prefix; characters after the prefix encode orderable options. Two lines with the same prefix are not drop-in replacements unless the differing columns match your need.
Suffixes seen here: #PBF, #TRPBF, 1#TRPBF.
Full MPN examples: LTC4291IUF#PBF, LTC4291IUF#TRPBF, LTC4291IUF-1#TRPBF.
Tip: photograph or copy the reel label — reel diameter, QTY per reel, and moisture sensitivity level (MSL) are often suffix-driven and won't show in the schematic.
How to Choose the Right LTC4291IUF Power over Ethernet Controllers
Match the footprint first
Packages here: 24-WFQFN Exposed Pad. Open the land-pattern drawing before you substitute a different suffix.
Electrical headroom
Compare voltage and current columns in the variant table. For LTC4291IUF, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.
Temp grade letter matters
Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.
Copy the full MPN
Do not BOM only "LTC4291IUF" — include the full suffix (e.g. #PBF, #TRPBF, 1#TRPBF). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for LTC4291IUF product family
Identity
Variant Parameters
Source LTC4291IUF with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 3 ordering variants from Analog Devices. Our team supports active, EOL, and hard-to-find component sourcing.
- Original manufacturer parts with traceability options
- BOM upload and multi-line RFQ support
- Package, grade, and compliance verification
Frequently Asked Questions
Common technical questions about the LTC4291IUF product family.