Part	Operating Temperature (Max)	Operating Temperature (Min)	Type	Number of Bits	Output	Mounting Type	Output Function	Voltage - Supply (Maximum)	Voltage - Supply (Minimum)
Quality Semiconductor QS74FCT521CTZ	70 °C	0 °C	Identity Comparator	8 bits	Active Low	Through Hole	A=B	5.25 V	4.75 V
Quality Semiconductor QS74FCT521DTSO	70 °C	0 °C	Identity Comparator	8 bits	Active Low	Surface Mount	A=B	5.25 V	4.75 V
Quality Semiconductor QS74FCT521CTS0			Identity Comparator	8 bits	Active Low		A=B	5.25 V	4.75 V
Quality Semiconductor QS74FCT521ATSO	70 °C	0 °C	Identity Comparator	8 bits	Active Low	Surface Mount	A=B	5.25 V	4.75 V
Quality Semiconductor QS74FCT521CTSOX			Identity Comparator	8 bits	Active Low		A=B	5.25 V	4.75 V
Quality Semiconductor QS74FCT521TS0			Identity Comparator	8 bits	Active Low		A=B	5.25 V	4.75 V
Quality Semiconductor QS74FCT521DTS0			Identity Comparator	8 bits	Active Low		A=B	5.25 V	4.75 V
Quality Semiconductor QS74FCT521BTS0			Identity Comparator	8 bits	Active Low		A=B	5.25 V	4.75 V
Quality Semiconductor QS74FCT521CTS0X			Identity Comparator	8 bits	Active Low		A=B	5.25 V	4.75 V

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