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NCP302LSN28T1G

Voltage detector, 2.8V threshold, ±1.5% accuracy, 0.5µA Iq, active-low OD output, TSOP-5

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制造商零件：

NCP302LSN28T1G

包装：

TSOP-5 (SOT-23-5) 2.9 x 1.6 x 1.1 mm

说明

产品概览

The onsemi NCP302LSN28T1G is a voltage detector / supervisor IC with a fixed detection threshold of 2.8V, housed in a TSOP-5 (SOT-23-5) package. It provides a precision voltage monitoring function with active-low open-drain output, featuring 1.5% threshold accuracy, low quiescent current of 0.5 µA, and built-in delay circuit. The device is designed for microprocessor reset generation, battery monitoring, and power supply supervision.

主要规格

功能	Voltage Detector / Supervisor
Detection Threshold	2.8 V (Fixed)
Threshold Accuracy	±1.5%
输出类型	Active Low, Open Drain (N-channel)
Quiescent Current (Typ)	0.5 µA
Built-in Delay	Yes (fixed internal delay)
Operating Voltage Range	0.7V to 10V
工作温度	-40°C to +85°C
包装	TSOP-5 (SOT-23-5)

特点

Precision detection threshold of 2.8V with ±1.5% accuracy
Ultra-low quiescent current of 0.5 µA for battery-powered applications
Active-low open-drain output compatible with various logic families
Built-in fixed delay eliminates external timing components
Wide operating voltage range from 0.7V to 10V
Hysteresis prevents output oscillation near threshold
Compact TSOP-5 package for space-constrained designs
Pb-Free, RoHS compliant

应用

Microprocessor and microcontroller reset generation
Battery voltage monitoring in portable devices
Power supply undervoltage detection
System power-on reset circuits
Battery backup switchover control

产品介绍：NCP302LSN28T1G 产品介绍

The onsemi NCP302LSN28T1G is a precision voltage detector IC designed for microprocessor reset generation, battery voltage monitoring, and power supply supervision. The device monitors the supply voltage and asserts an active-low open-drain output when the voltage drops below the fixed detection threshold of 2.8V (±1.5% accuracy). When the supply voltage rises above the threshold plus hysteresis, the output is released after a built-in fixed delay, ensuring stable system reset timing without external components. The ultra-low quiescent current of 0.5 µA makes it ideal for battery-powered applications where always-on monitoring is required. Housed in a compact TSOP-5 (SOT-23-5) package, the device operates from 0.7V to 10V and includes internal hysteresis to prevent output oscillation near the threshold voltage.

工作原理：NCP302LSN28T1G 工作原理

The NCP302LSN28T1G uses an internal precision voltage reference and comparator to monitor the supply voltage (VDD). The comparator compares VDD against the fixed detection threshold (2.8V). When VDD falls below the threshold, the comparator output triggers the output driver, pulling the open-drain N-channel MOSFET output low (active state). When VDD rises above the threshold plus the hysteresis voltage, the comparator de-asserts, but the output remains low for the duration of the built-in delay timer, ensuring a clean reset signal. The delay is generated by an internal oscillator and counter, eliminating the need for an external delay capacitor. The hysteresis (typically 50 mV) ensures that small noise fluctuations near the threshold do not cause output chattering. The open-drain output requires an external pull-up resistor (typically 10 kΩ to 100 kΩ) to the desired logic voltage, enabling level shifting between the monitored supply and the logic interface.

引脚说明：NCP302LSN28T1G 引脚定义和功能

针脚	名称	类型	功能
1	VDD	电源	Supply voltage input (0.7V to 10V) — also the monitored voltage
2	接地	电源	地面参考
3	北卡罗来纳州	北卡罗来纳州	No internal connection
4	出局	输出	Detection output (active low, open drain) — requires external pull-up resistor
5	北卡罗来纳州	北卡罗来纳州	No internal connection

Application Scenarios:In which products and applications isNCP302LSN28T1G 中古

Microcontroller power-on reset generation in embedded systems
Li-ion battery undervoltage detection in portable devices
3.3V power supply supervision in industrial control boards
Battery backup switchover trigger in RTC circuits
System brownout detection in automotive electronics

Alternative Models:What chips are recommended as replacements for NCP302LSN28T1G

制造商	部件编号	包装	说明
onsemi	NCP302LSN30T1G	TSOP-5	3.0V threshold variant
onsemi	NCP302LSN33T1G	TSOP-5	3.3V threshold variant
德州仪器	TLV803EA28DBZR	SOT-23-3	2.8V voltage supervisor
Maxim Integrated	MAX809STR28T	SOT-23-3	2.8V reset IC, 3-pin
onsemi	NCP303LSN28T1G	TSOP-5	Active-high output variant

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