參數(shù)資料
型號(hào): SN75HVD1176DG4
廠商: TEXAS INSTRUMENTS INC
元件分類: Buffer和線驅(qū)動(dòng)
英文描述: LINE TRANSCEIVER, PDSO8
封裝: GREEN, PLASTIC, SOIC-8
文件頁數(shù): 6/20頁
文件大?。?/td> 636K
代理商: SN75HVD1176DG4
APPLICATION INFORMATION
Thermal Characteristics of IC Packages
SurfaceNode
JC Calculated/Measured
Junction
JB Calculated/Measured
PCBoard
CA Calculated
AmbientNode
q
SLLS563E – JULY 2003 – REVISED AUGUST 2008 ......................................................................................................................................................... www.ti.com
θ
JA (Junction-to-Ambient Thermal Resistance) is defined as the difference in junction temperature to ambient
temperature divided by the operating power.
θ
JA is not a constant and is a strong function of:
PCB design (50% variation)
altitude (20% variation)
device power (5% variation)
θ
JA can be used to compare the thermal performance of packages if the specific test conditions are defined and
used. Standardized testing includes specification of PCB construction, test chamber volume, sensor locations,
and the thermal characteristics of holding fixtures.
θ
JA is often misused when it is used to calculate junction
temperatures for other installations.
TI uses two test PCBs as defined by JEDEC specifications. The low-k board gives average in-use condition
thermal performance, and it consists of a single copper trace layer 25 mm long and 2-oz thick. The high-k board
gives best case in-use condition, and it consists of two 1-oz buried power planes with a single copper trace layer
25 mm long and 2-oz thick. A 4% to 50% difference in
θ
JA can be measured between these two test cards
θ
JC (Junction-to-Case Thermal Resistance) is defined as difference in junction temperature to case divided by
the operating power. It is measured by putting the mounted package up against a copper block cold plate to
force heat to flow from die, through the mold compound into the copper block.
θ
JC is a useful thermal characteristic when a heatsink is applied to package. It is not a useful characteristic to
predict junction temperature because it provides pessimistic numbers if the case temperature is measured in a
nonstandard system and junction temperatures are backed out. It can be used with
θ
JB in 1-dimensional thermal
simulation of a package system.
θ
JB (Junction-to-Board Thermal Resistance) is defined as the difference in the junction temperature and the
PCB temperature at the center of the package (closest to the die) when the PCB is clamped in a cold-plate
structure.
θ
JB is only defined for the high-k test card. θJB provides an overall thermal resistance between the die
and the PCB. It includes a bit of the PCB thermal resistance (especially for BGA’s with thermal balls) and can be
used for simple 1-dimensional network analysis of package system (see Figure 21).
Figure 21. Thermal Resistance
14
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): SN65HVD1176 SN75HVD1176
相關(guān)PDF資料
PDF描述
SN75LVDS32DRG4 QUAD LINE RECEIVER, PDSO16
SN75LVDS32DG4 QUAD LINE RECEIVER, PDSO16
SNP-8011261B102 126 um, SINGLE MODE, SIMPLEX FC CONNECTOR
SNP-88912618102 126 um, SINGLE MODE, SIMPLEX FC CONNECTOR
SNP-88612610302G 126 um, SINGLE MODE, SIMPLEX FC CONNECTOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SN75HVD1176DR 功能描述:RS-485接口IC PROFIBUS RS-485 Transceiver RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
SN75HVD1176DRG4 功能描述:總線收發(fā)器 PROFIBUS RS-485 Transceiver RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
SN75HVD11D 功能描述:RS-485接口IC 3.3V Differential Transceivers RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
SN75HVD11DG4 功能描述:總線收發(fā)器 3.3V Differential Transceivers RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
SN75HVD11DR 功能描述:RS-485接口IC 3.3V Differential Transceivers RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube