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參數(shù)資料
| 型號(hào)： | A1244LUA-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： | 1.5 MM X 4 MM, 3 MM HEIGHT, LEAD FREE, SIP-3 |
| 文件頁(yè)數(shù)： | 12/12頁(yè) |
| 文件大?。?/td> | 251K |
| 代理商： | A1244LUA-I1-T |
Chopper-Stabilized, Two Wire
Hall-Effect Latch
A1244
9
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Preliminary Data Sheet
Subject to Change Without Notice
May 5, 2011
The device must be operated below the maximum junction tem-
perature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating supplied
power or improving the heat dissipation properties of the appli-
cation. 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 = 4 mA, and RJA = 140 °C/W, then:
PD = VCC
× ICC = 12 V × 4 mA = 48 mW
T = PD
× RJA = 48 mW × 140 °C/W = 7°C
TJ = TA + T = 25°C + 7°C = 32°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 a
low-K PCB.
Observe the worst-case ratings for the device, specifically:
RJA=110 °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÷110 °C/W=136mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max)= 136mW÷17 mA= 8 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.
Power Derating
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| A1244LUA-I2-T | 功能描述:IC HALL EFFECT LATCH SIP-3 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 |
| A1245LLHLT-I1-T | 功能描述:IC HALL EFFECT LATCH SOT23-3 制造商:allegro microsystems, llc 系列:- 包裝:帶卷（TR） 零件狀態(tài):有效 功能:卡銷 技術(shù):霍爾效應(yīng) 極化:南極 感應(yīng)范圍:4mT 跳閘，-4mT 釋放 測(cè)試條件:-40°C ~ 150°C 電壓 - 電源:3 V ~ 24 V 電流 - 電源（最大值）:6.9mA 電流 - 輸出（最大值）:- 輸出類型:開路漏極 特性:- 工作溫度:-40°C ~ 150°C（TA） 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商器件封裝:SOT-23-3 標(biāo)準(zhǔn)包裝:3,000 |
| A1245LLHLT-I2-T | 功能描述:IC HALL EFFECT LATCH SOT23-3 制造商:allegro microsystems, llc 系列:- 包裝:帶卷（TR） 零件狀態(tài):有效 功能:卡銷 技術(shù):霍爾效應(yīng) 極化:南極 感應(yīng)范圍:4mT 跳閘，-4mT 釋放 測(cè)試條件:-40°C ~ 150°C 電壓 - 電源:3 V ~ 24 V 電流 - 電源（最大值）:5mA 電流 - 輸出（最大值）:- 輸出類型:開路漏極 特性:- 工作溫度:-40°C ~ 150°C（TA） 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商器件封裝:SOT-23-3 標(biāo)準(zhǔn)包裝:3,000 |
| A1245LLHLX-I1-T | 功能描述:IC HALL EFFECT LATCH SOT23-3 制造商:allegro microsystems, llc 系列:- 包裝:帶卷（TR） 零件狀態(tài):有效 功能:卡銷 技術(shù):霍爾效應(yīng) 極化:南極 感應(yīng)范圍:4mT 跳閘，-4mT 釋放 測(cè)試條件:-40°C ~ 150°C 電壓 - 電源:3 V ~ 24 V 電流 - 電源（最大值）:6.9mA 電流 - 輸出（最大值）:- 輸出類型:開路漏極 特性:- 工作溫度:-40°C ~ 150°C（TA） 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商器件封裝:SOT-23-3 標(biāo)準(zhǔn)包裝:10,000 |
| A1245LLHLX-I2-T | 功能描述:IC HALL EFFECT LATCH SOT23-3 制造商:allegro microsystems, llc 系列:- 包裝:帶卷（TR） 零件狀態(tài):有效 功能:卡銷 技術(shù):霍爾效應(yīng) 極化:南極 感應(yīng)范圍:4mT 跳閘，-4mT 釋放 測(cè)試條件:-40°C ~ 150°C 電壓 - 電源:3 V ~ 24 V 電流 - 電源（最大值）:5mA 電流 - 輸出（最大值）:- 輸出類型:開路漏極 特性:- 工作溫度:-40°C ~ 150°C（TA） 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商器件封裝:SOT-23-3 標(biāo)準(zhǔn)包裝:10,000 |
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