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STHS4257L1中文资料PDF规格书
STHS4257L1规格书详情
Summary description
The STHS4257 is an IEEE802.3af-compliant family of interface controllers for Power over Ethernet (PoE) Powered Device (PD) applications. The devices consist of two main sections:
● The IEEE802.3af interface to the PoE powered RJ-45 wall socket, and
● the Hot Swap Controller (HSC) functions required to protect the PD during insertion, operation, and withdrawal from the RJ-45 socket.
These devices have an integrated high voltage power MOSFET (low-side switch) with low RON and the capability to accept transients as high as 100V. Since the pins (such as GND and VIN) which interface to the RJ-45 socket can routinely see high peak voltages in excess of 100V, it is strongly recommended that board designers protect the PD device with a transient voltage suppressor, such as the SMAJ58A (available from STMicroelectronics), connected between the GND and VIN pins (see Figure 4 on page 8).
Features
■ IEEE 802.3af-compliant interface for Powered Devices (PDs)
■ Integrated 100V, 450mA power MOSFET low side switch
■ Inrush current limit
■ Normal operation current limit
■ Integrated 25kΩ signature resistor
■ Signature disable (STHS4257A1/L1)
■ Resistor-programmable classification current (Class 0-4)
■ Power Good output, open drain
■ Undervoltage Lockout (UVLO)
■ Thermal overload protection (two-step for the STHS4257A/L)
■ Latch (L) or auto-retry (A) after repetitive thermal overload
■ Industrial temperature range: –40 to +85°C
■ SO8 and DFN8 (3mm x 3mm) packages
■ RoHS compliant
Applications
■ Voice over IP (VoIP) phones
■ Web cameras
■ WLAN access points
■ Internet appliances
■ POS terminals
■ RFID readers
产品属性
- 型号:
STHS4257L1
- 制造商:
STMICROELECTRONICS
- 制造商全称:
STMicroelectronics
- 功能描述:
IEEE 802.3af PoE Powered Device(PD) interface controller with integrated signature resistor
供应商 | 型号 | 品牌 | 批号 | 封装 | 库存 | 备注 | 价格 |
---|---|---|---|---|---|---|---|
ST/意法 |
24+ |
TO3P |
58000 |
全新原厂原装正品现货,可提供技术支持、样品免费! |
询价 | ||
ST |
23+ |
TO-220 |
16900 |
正规渠道,只有原装! |
询价 | ||
ST(意法半导体) |
23+ |
HU3PAK |
7350 |
现货供应,当天可交货!免费送样,原厂技术支持!!! |
询价 | ||
ST |
TO-220 |
36900 |
集团化配单-有更多数量-免费送样-原包装正品现货-正规 |
询价 | |||
STANLEY(史丹利) |
21+ |
NA |
4600 |
中国航天工业部战略合作伙伴行业领导者 |
询价 | ||
ST-意法半导体 |
24+25+/26+27+ |
TO-247-3 |
78800 |
一一有问必回一特殊渠道一有长期订货一备货HK仓库 |
询价 | ||
ST |
22+ |
TO-220 |
16900 |
支持样品 原装现货 提供技术支持! |
询价 | ||
N/A |
15540 |
询价 | |||||
STMicroelectronics |
23+ |
SMD |
67000 |
原装正品实单可谈 库存现货 |
询价 | ||
isc |
2024 |
TO-247 |
1000 |
国产品牌isc,可替代原装 |
询价 |