PM8805TR - IEEE 802.3bt PoE-PD Controller 57V 2A | STMicroelectronics
N.º da peça: PM8805TR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.95 | $6,95 |
| 10 | $6.26 | $62,60 |
| 100 | $6.05 | $605,00 |
| 500 | $5.63 | $2.815,00 |
| 1.000 | $5.15 | $5.150,00 |
PM8805TR Visão geral
A PoE powered device interface is the front-end circuit in any Ethernet-powered equipment that negotiates and extracts power from the PoE link. Within the power-management hierarchy, it sits above the raw powered line and below downstream DC-DC converters: it performs detection, classification, inrush control and isolation before local regulators take over. The PM8805 integrates this interface as a system in package, dramatically reducing external component count.
Key features include dual embedded active bridge rectifiers with their own gate driving circuitry, an integrated charge pump to drive high-side hot-swap MOSFETs, a fully compliant 802.3bt PD interface supporting Type 3 and Type 4 power classes, and hot-swap protection. Because the bridge, hot-swap switch and PD controller share one package, board area and BOM cost shrink versus discrete solutions.
Technically, the active bridge eliminates the four-schottky-diode rectifier front end, cutting conduction losses and improving overall power conversion efficiency for high-power 802.3bt deliveries. The controller supports 802.3af, 802.3at (PoE+) and 802.3bt on two channels, with undervoltage lockout at 33.5 V ensuring valid PoE voltage before power-up sequencing begins.
Typical applications include IEEE 802.3bt wireless access points, IP security cameras, PTZ domes, network switches, video doorbells and any Ethernet-terminal equipment drawing up to 99.9 W from the powered line.
When designing with the PM8805, provide a generous exposed-pad thermal connection on the PCB and observe the datasheet layout guidelines for the hot-swap path to manage inrush current and thermal stress during power classification and startup.
This page synthesizes distributor pricing, application guidance, and availability information not found in the manufacturer datasheet, as of 2026-10-19.
Alternativas drop-in para PM8805TR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
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| Product Type | IEEE 802.3bt PoE-PD interface with embedded dual active bridge (system in package) |
| Standards Supported | IEEE 802.3af, 802.3at (PoE+), 802.3bt |
| Number of Channels | 2 |
| Maximum Input Voltage | 57 V |
| Corrente máxima de saída | 2 A |
| UVLO Threshold | 33.5 V |
| Maximum Deliverable Power | 99.9 W |
| Embedded Active Bridges | 2 with gate driving circuitry |
| Hot Swap MOSFET Driver | Integrated charge pump for high-side MOSFETs |
| Encapsulamento | 43-VFQFPN (8x8 mm) with exposed pad |
| Tipo de montagem | Surface Mount |
| Classification Support | PoE detection and classification (Type 3/Type 4 capable) |
| Packaging | Tape and Reel (TR suffix) |
Guia de Configuração de Pinos do PM8805TR 43-vfqfpn (8x8 mm) with exposed pad
Configuração de pinos para PM8805TR (pacote 43-vfqfpn (8x8 mm) with exposed pad). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para PM8805TR.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
PM8805TR é adequado para 6 aplicaçãos: IEEE 802.3bt Wireless Access Points, PTZ IP Security Cameras, 5G Small Cell and Network Switches, Industrial Ethernet Sensors and Controllers, Smart Lighting and LED Luminaires, Video Intercoms and Door Controllers.
IEEE 802.3bt Wireless Access Points
High-power 802.11ax/802.11be enterprise access points typically draw 30-90 W from the Ethernet link, requiring an IEEE 802.3bt Type 3 or Type 4 PD front end. The PM8805TR fits this application because it delivers up to 99.9 W, withstands the 57 V maximum powered-line voltage, and its integrated dual active bridge removes the four-schottky rectifier stage, improving efficiency at these power levels. The embedded PD interface handles detection, classification and inrush sequencing automatically. Placed between the Ethernet magnetics center taps and the downstream DC-DC converters, the PM8805TR provides a clean, protected power feed; designers should size the output capacitance for the radio PA burst currents.
Recomendado
PTZ IP Security Cameras
Pan-tilt-zoom network cameras need 25 W to 60 W for motors, IR illuminators and image processing, which exceeds the 802.3at limit and mandates 802.3bt power. The PM8805TR suits this use case with its 2 A hot-swap capability and 99.9 W maximum delivery, while the 33.5 V UVLO guarantees the camera only boots on a valid PoE source. Its integrated hot-swap MOSFET and charge pump provide controlled inrush, protecting camera electronics when plugged into live PoE infrastructure. Typical implementations place the PM8805TR immediately after the RJ45 magnetics and feed a buck converter generating the 12 V motor and 5 V logic rails, with the exposed pad soldered to a thermal copper area.
Recomendado
5G Small Cell and Network Switches
5G small cells and edge network switches draw sustained 40-90 W loads from PoE++ infrastructure. The PM8805TR addresses these products by supporting IEEE 802.3bt with 57 V input tolerance and dual embedded active bridges that reduce rectification losses versus diode bridges, directly improving power efficiency and thermal headroom in sealed outdoor enclosures. Its two-channel architecture supports designs that combine power from multiple PoE pairs. The integrated PD interface manages classification handshakes with the PSE automatically. Engineers typically follow the PM8805 with high-efficiency synchronous bucks to generate the PA supply and baseband rails, adding bulk capacitance to buffer transmit-burst current demand.
Recomendado
Industrial Ethernet Sensors and Controllers
Industrial 4-20 mA replacements and PROFINET/EtherCAT field devices increasingly run entirely from the PoE link. The PM8805TR fits because its 33.5 V UVLO and full IEEE 802.3af/at/bt compliance ensure reliable power-up negotiation across legacy and modern PSE equipment, while its 2 A rating covers sensor clusters with actuators. The system-in-package integration reduces qualification effort in harsh environments by minimizing external components in the exposed power path. A typical circuit places the PM8805TR after the RJ45 with TVS protection, feeding an isolated or non-isolated buck stage for the 3.3 V logic rail; the integrated hot-swap function protects against field wiring faults during connector mating.
Recomendado
Smart Lighting and LED Luminaires
PoE-connected LED luminaires combine lighting power and data on one Ethernet cable, with high-output fixtures drawing up to 90 W under 802.3bt. The PM8805TR's 99.9 W capability, 57 V maximum input, and efficient embedded active bridges make it a natural front end, since bridge losses at multi-ampere LED currents materially affect thermal design in enclosed fixtures. Its PD interface performs classification to advertise the fixture's power class to the PSE. Downstream, the PM8805TR output feeds LED driver stages and a small auxiliary rail for lighting controllers. Designers should route the hot-swap output with wide copper and respect the inrush limits to avoid nuisance PSE disconnects.
Recomendado
Video Intercoms and Door Controllers
Networked door stations, video intercoms and access-control terminals draw 15-30 W for displays, locks, cameras and audio amplifiers, fitting 802.3bt Type 3 budgets. The PM8805TR serves these designs with full 802.3af/at/bt negotiation, 2 A hot-swap output and integrated inrush control that prevents lock actuator surges from tripping the PSE. The 33.5 V UVLO ensures stable startup on long cable runs where voltage droop is significant. A typical implementation places the PM8805TR behind the Ethernet magnetics, then generates 12 V for the lock driver and 3.3 V for the processor; the single-package integration simplifies compliance testing of the PD signature and classification behavior.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PM8805TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto |
|---|---|
| Package | 43-VFQFPN (8x8 mm) exposed pad |
| Brand | STMicroelectronics |
| Standards | 802.3af / 802.3at / 802.3bt |
| Maximum Input Voltage | 57 V |
| Maximum Output Current | 2 A |
| UVLO Threshold | 33.5 V |
| Max Power | 99.9 W |
| Integrated Active Bridge | Yes (dual) |
Principais diferenciais
- Fully integrated dual active bridge eliminates external rectifier stage (vs Discrete PoE PD controller + diode bridge solutions)
- Single system-in-package covering bridge, charge pump, hot-swap FET and PD interface (vs Multi-chip PoE front ends)
- Broad standards coverage in one part (802.3af/at/bt) (vs Legacy PoE+ only PD controllers)
Notas de projeto
The PM8805TR integrates two active bridges and the hot-swap MOSFET in a 43-VFQFPN 8x8 mm package; at high 802.3bt loads (e.g., estimated 90 W delivery at roughly 95% front-end efficiency implies several watts of dissipation) the exposed pad must be soldered to a substantial ground plane with an array of thermal vias. Estimate the junction rise using the datasheet theta-JA with your actual copper area before finalizing the PCB stack-up.
Keep the hot-swap power path short and wide, and place the bulk output capacitance between the PM8805TR output and the downstream DC-DC stage as close to the IC as possible. Follow the ST datasheet typical application circuit for bridge and sense connections; deviation can affect classification accuracy and inrush control. Add TVS protection at the RJ45 side per standard PoE surge practices.
Do not exceed the 57 V maximum input; PoE line transients on long cables can exceed nominal voltage, so verify PSE voltage plus droop/transient margin. Ensure the PD classification resistors/settings match the actual system power budget so the PSE allocates sufficient power - under-classifying causes brownouts at full load, and over-classifying wastes PSE budget.
Informações de conformidade
Compliance status not stated in the provided web data; consult the ST product page or datasheet for official RoHS/REACH declarations.
