Allegro Multimedia A1321 manual Characteristic Symbol Test Conditions Value Units

A1321, A1322, and A1323

Ratiometric Linear Hall Effect Sensor for High-Temperature Operation

THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information

Characteristic	Symbol	Test Conditions*	Value	Units
		Package LH, 1-layer PCB with copper limited to solder pads	228	ºC/W
Package Thermal Resistance	RθJA	Package LH, 2-layer PCB with 0.463 in.2 of copper area each side	110	ºC/W
		connected by thermal vias
		Package UA, 1-layer PCB with copper limited to solder pads	165	ºC/W

*Additional thermal information available on Allegro website.

Power Derating Curve

	6
									VCC(max)
(V)	5		1-layer PCB, Package LH
CC			(RΘJA	= 228 ºC/W)					VCC(min)
V			1-layer PCB, Package UA
Allowable	4
			(RΘJA = 165 ºC/W)
			2-layer PCB, Package LH
	3		(RΘJA = 110 ºC/W)
Maximum	2
	1
	0
	20	40	60	80	100	120	140	160	180

Temperature (ºC)

Power Dissipation, PD (mW)

Power Dissipation versus Ambient Temperature

1900
1800
1700
1600
1500
1400
1300
1200				2-
1100			(R		layer		PCB,
1000				Θ
				JA =
						110
	(R										Package)
900	1								ºC/W
	-
		layer
800	ΘJA		= PCB,				Package								LH
700				165
						ºC/W)
600													UA
500
		1-
400		layer
		(R
300				JA	=	PCB,				Pa		ckag
			Θ			228
															LH
200								ºC/W)						e
100
0
20	40			60						80				100		120	140	160	180
										Temperature (°C)

Allegro MicroSystems, Inc. 8

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com