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參數(shù)資料
| 型號： | A1242LUA-I1-T |
| 元件分類： | 磁阻傳感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, -8-8mT, RECTANGULAR, THROUGH HOLE MOUNT |
| 封裝： | LEAD FREE, SIP-3 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 296K |
| 代理商： | A1242LUA-I1-T |
Two-Wire Chopper-Stabilized Hall Effect Latch
A1242
9
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Power Derating
The device must be operated below the maximum junction
temperature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, RJA, is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, RJC, is
relatively small component of RJA. Ambient air temperature,
TA, and air motion are significant external factors, damped by
overmolding.
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
PD = VIN
× IIN
(1)
T = PD
× RJA
(2)
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 6 mA, and RJA = 165 °C/W, then:
PD = VCC
× ICC = 12 V × 6 mA = 72 mW
T = PD
× RJA = 72 mW × 165 °C/W = 12°C
TJ = TA + T = 25°C + 12°C = 37°C
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max),
at a selected RJA and TA.
Example: Reliability for VCC at TA=150°C, package LH, using
minimum-K PCB.
Observe the worst-case ratings for the device, specifically:
RJA=228°C/W, TJ(max) =165°C, VCC(max)= 24 V, and
ICC(max) = 17 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
Tmax = TJ(max) – TA = 165°C–150°C = 15°C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = Tmax÷RJA =15°C÷228 °C/W=66mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max)= 66mW÷17mA=3.9 V
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤VCC(est).
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli-
able operation between VCC(est) and VCC(max) requires enhanced
RJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
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| A1242LUA-I2-T | 功能描述:IC LATCH HALL EFFECT 3-SIP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉(zhuǎn) 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類型:數(shù)字式，PWM，8.5 位串行 特點(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
| A1243 | 制造商:Hakko 功能描述:Tip,0.8D,929 -2/939,903 Used With Soldering Stations |
| A1243LLHLX-I1-T | 功能描述:IC HALL EFFECT LTCH DGTL SOT23W 制造商:allegro microsystems, llc 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:10,000 |
| A1243LLHLX-I2-T | 功能描述:IC HALL EFFECT LTCH DGTL SOT23W 制造商:allegro microsystems, llc 系列:- 包裝:- 零件狀態(tài):有效 功能:- 技術(shù):- 極化:- 感應(yīng)范圍:- 測試條件:- 電壓 - 電源:- 電流 - 電源（最大值）:- 電流 - 輸出（最大值）:- 輸出類型:- 特性:- 工作溫度:- 封裝/外殼:- 供應(yīng)商器件封裝:- 標(biāo)準(zhǔn)包裝:10,000 |
| A1244 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Chopper-Stabilized, Two Wire Hall-Effect Latch |
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