HPA00447PWR - IEEE 802.3af PoE PD Controller | Texas Instruments
料号： HPA00447PWR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.05 | $2.05 |
| 10 | $1.85 | $18.50 |
| 100 | $1.58 | $158.00 |
| 500 | $1.32 | $660.00 |
| 1,000 | $1.05 | $1,050.00 |
HPA00447PWR 概述
A PoE powered device controller is the interface IC that sits between the Ethernet cable and the DC-DC converter of a powered end device such as an IP camera, wireless access point, or VoIP phone. Within the power management hierarchy, it performs the detection, classification, and inrush-current limiting duties that IEEE 802.3af requires before a power sourcing equipment (PSE) switch delivers up to 12.95 W of usable power to a Class 3 device over the data or spare pairs.
Key features of the HPA00447PWR include IEEE 802.3af-compliant powered device detection and Class 3 classification signaling, controlled inrush current limiting to satisfy the PSE power-up profile, an internal pass-device gate drive, and an auto-retry fault-management mode that re-attempts power delivery after a fault condition clears rather than latching off. Operating temperature is specified from -40C to +85C, matching industrial and outdoor networking equipment requirements.
Technically, the device integrates the precision detection and classification comparators, a programmable class resistor input (CLS), thermal protection, and gate control for an external MOSFET that isolates the load during detection. This architecture lets designers meet the IEEE timing and signature requirements with few external components while keeping the burden resistor and bridge rectifier on the front end.
Typical applications include IEEE 802.3af IP security cameras, 802.11 wireless access points, VoIP telephones, and networked access-control readers that draw mid-range power fitting the Class 3 envelope. The auto-retry behavior is particularly useful in outdoor and industrial installations where transient faults should self-recover without a technician visit.
When designing, set the classification resistor correctly for Class 3 and verify that the downstream DC-DC converter does not present a negative input impedance that collapses the PSE rail during startup; the inrush-control timing interacts directly with converter soft-start.
This page synthesizes distributor sourcing data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： HPA00447PWR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： HPA00447PWR （相同外形与封装尺寸） ——差异在于 Function, Package.
快速对比工具——选择替代料号进行并排对比：
TPS2375PWR-1
✅ 直接替换📋 参考替代料（不在目录中）
TPS2375PW-1
✅ 直接替换✓ 有现货
$1.45 / 个
查看数据手册 →TPS2375PWR
✅ 直接替换📋 参考替代料（不在目录中）
TPS2375PW
✅ 直接替换📋 参考替代料（不在目录中）
HPA00447PWR 最大额定值与电气特性
| 功能 | IEEE 802.3af PoE Powered Device Controller with Auto-Retry |
| PoE Standard | IEEE 802.3af |
| PoE Class Support | Class 3 |
| Fault Mode | Auto-Retry |
| 工作温度 | -40C to +85C |
| 封装 | TSSOP-8 (PWR) |
| 引脚数 | 8 |
| Number of Channels | 1 |
| 安装类型 | Surface Mount |
| Temperature Grade | Industrial |
| Package Shape | Rectangular (TSSOP) |
HPA00447PWR rectangular (tssop) 引脚配置指南
HPA00447PWR（rectangular (tssop) 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： HPA00447PWR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
HPA00447PWR 适用于 6 应用s: IP Security Cameras, Wireless Access Points, VoIP Telephones, Networked Access Control and Building Automation, Industrial Ethernet Sensors and IoT Nodes, PoE Splitter and Midspan Adapter Designs.
IP Security Cameras
IEEE 802.3af IP cameras are the classic powered device for the HPA00447PWR. The controller performs detection and Class 3 classification so a compliant PSE switch delivers up to 12.95 W of usable PD power, sufficient for a camera module, IR illuminator bank, and pan-tilt mechanism. Its controlled inrush current limiting satisfies the IEEE power-up profile during camera boot, while the auto-retry mode restores operation after transient faults such as motor stall overloads - critical for outdoor units that cannot be serviced on demand. Place the controller between the data-pair transformer center taps and the isolated flyback converter front end.
推荐
Wireless Access Points
Enterprise and outdoor 802.11 wireless access points commonly draw Class 3 power levels from Ethernet cabling, making the HPA00447PWR an appropriate PD interface. The device handles IEEE 802.3af detection signatures and classification handshake over the spare or data pairs, then gates the isolated DC-DC converter that feeds the RF chipset. The -40C to +85C industrial rating covers rooftop and pole-mounted enclosures that experience solar heating and cold nights. Because APs reboot autonomously after power brownouts, the auto-retry fault recovery avoids truck rolls when a transient overload trips protection.
推荐
VoIP Telephones
VoIP desk phones powered from the Ethernet switch use a Class 3 PD interface like the HPA00447PWR to negotiate and receive power over the data pairs. The controller presents the correct 25 kOhm detection signature, signals Class 3 with the CLS resistor, and limits inrush while the phone's bulk capacitance charges, preventing the PSE from tripping. Its low external component count suits the constrained PCB area around the RJ45 connector and magnetics. When the phone is placed on hook and load drops, quiescent behavior of the controller keeps the PSE connection stable without misclassification.
推荐
Networked Access Control and Building Automation
Door controllers, card readers, and building-automation nodes increasingly take power and data over a single Ethernet run, fitting the IEEE 802.3af Class 3 envelope served by the HPA00447PWR. The device's detection and classification circuitry ensures the switch allocates the correct power budget, and its gate-drive architecture isolates the downstream converter during cable insertion so no hot-plug transients disturb the network. The auto-retry mode suits lock actuators and relays that occasionally draw fault-level surge currents, restoring operation automatically after the surge passes rather than requiring a power cycle.
推荐
Industrial Ethernet Sensors and IoT Nodes
Industrial sensors and edge-IoT nodes on Ethernet backbones benefit from PoE power delivery using the HPA00447PWR as the PD front end. The industrial -40C to +85C rating matches factory-floor and outdoor cabinet environments, and the TSSOP-8 footprint keeps the power interface compact next to the RJ45 magnetics. The controller's precise IEEE 802.3af detection signature prevents misclassification on mixed switches, while inrush limiting protects long cable runs from voltage droop during device startup. Auto-retry behavior maximizes uptime for unattended nodes in hard-to-reach locations such as pipe racks and rooftop installations.
推荐
PoE Splitter and Midspan Adapter Designs
PoE splitters that extract power from a data cable to feed non-PoE equipment use the HPA00447PWR as the compliant PD interface before the DC-DC converter stage. The controller guarantees that the sourcing switch correctly detects and classifies the splitter load, and its inrush control manages the bulk output capacitance typical of splitter designs. In 5V/12V splitter products, the Class 3 classification maximizes the allocated power budget so downstream converters can supply higher-power accessories. The TSSOP-8 package suits the small form factor required for inline adapters molded into cable assemblies.
推荐
推荐产品汇总
工程参考数据： HPA00447PWR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TPS2375PWR-1 | TPS2375PW-1 | TPS2375PWR | TPS2378DDA |
|---|---|---|---|---|---|
| Package | TSSOP-8 (PWR) | TSSOP-8 (PWR) - same | TSSOP-8 (PWR) - same | TSSOP-8 (PWR) - same | SOIC-8 PowerPAD (DDA) - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| PoE Standard | IEEE 802.3af | IEEE 802.3af | IEEE 802.3af | IEEE 802.3af | IEEE 802.3af/802.3at-capable family |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Pin Compatibility | TSSOP-8 reference pinout | Pin-to-pin identical | Pin-to-pin identical | Pin-to-pin identical | Not pin-compatible |
| Drop-in Replacement | Yes (orderable as TPS2375PWR-1) | Yes, 100% match | Yes, 100% match | Yes, fault mode differs | No, PCB rework required |
关键差异点
- Auto-retry fault recovery maximizes uptime （对比 TPS2375PWR)
- Direct mapping to a current TI catalog part （对比 TPS2378DDA)
- Trade-off: 802.3af Class 3 power ceiling （对比 TPS2378DDA)
设计说明
Set the Class 3 classification resistor on the CLS pin exactly per the TI TPS2375-1 datasheet table; an incorrect class resistor makes the PSE allocate the wrong power budget and can cause shutdown under peak camera or AP load. Verify the downstream DC-DC converter presents a stable input impedance during startup - a converter that draws before the inrush timer completes will look like a fault. Estimated: a Class 3 load at 12.95 W from a nominal 48 V rail draws roughly 270 mA average input current.
Confirm you need the -1 (auto-retry) variant before laying out the BOM. The base TPS2375 latches off after a fault and needs a VDD power cycle to recover, while TPS2375PWR-1 automatically retries. They share the same TSSOP-8 footprint, so the difference is invisible on the PCB and only appears during fault testing. Also ensure the front-end bridge rectifiers and 0.1 uF detection capacitor at the input meet IEEE 802.3af timing so detection signatures pass on all switch vendors.
Place the controller close to the RJ45 transformer center taps with a short, wide kelvin return to the bulk capacitor and sense resistor to keep detection and classification thresholds accurate. Provide solid copper area under the external pass MOSFET for thermal relief, and keep the CLS classification resistor away from switching-node noise of the downstream converter to prevent misclassification. A 10-100 uF bulk capacitor on the PD side, sized per the datasheet inrush profile, ensures the PSE does not trip during power-up.
合规信息
Compliance data was not present in the provided verified web data; the PWR suffix conventionally denotes TI RoHS/lead-free tape-and-reel packaging, but this must be confirmed against the TI product page before declaring compliance.
