类别是'category.线性比较器' (7536)
- 所有品牌
对比 | 图片 | 产品型号 | 品牌 | 数据表 | 库存 | 价格(含增值税) | 数量 | Rohs | 工厂交货时间 | 生命周期状态 | 触点镀层 | 底架 | 安装类型 | 包装/外壳 | 表面安装 | 引脚数 | Current - Supply (Nom) | 操作温度 | 包装 | 已出版 | 系列 | JESD-609代码 | 无铅代码 | 零件状态 | 湿度敏感性等级(MSL) | 终止次数 | ECCN 代码 | 类型 | 端子表面处理 | 最高工作温度 | 最小工作温度 | 最大功率耗散 | 端子位置 | 终端形式 | 峰值回流焊温度(摄氏度) | 功能数量 | 电源电压 | 端子间距 | Reach合规守则 | 时间@峰值回流温度-最大值(s) | 基本部件号 | 引脚数量 | JESD-30代码 | 最大电流源 | 资历状况 | 输出类型 | 电源 | 通道数量 | 电路数量 | 最大电源电压 | 最小电源电压 | 功率耗散 | 输出电流 | 传播延迟 | 静态电流 | 接通延迟时间 | 回应时间 | 共模拒绝率 | 输入偏正电流 | 电压 - 电源,单/双路(±) | 每个通道的输出电流 | 输入失调电压(Vos) | 负电源电压(Vsup) | 平均偏置电流-最大值 (IIB) | 电源抑制比 | 电源电压限制-最大值 | 最大双电源电压 | 最小双电源电压 | 最大输入电流 | 输入偏置电流 | 最大负电源电压(Vsup) | 输入失调电压-最大值 | 最大静态电流 | 电压 - 输入断态 (最小值) | 最大输入偏正电流 | 迟滞 | 共模抑制比/电源抑制比(类比) | 输出电流(典型值) | 传播延迟(最大) | 高度 | 座位高度(最大) | 长度 | 宽度 | 辐射硬化 | 达到SVHC | RoHS状态 | 无铅 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
![]() | MAX922EPA | Maxim Integrated | 数据表 | 50 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 通孔 | 通孔 | 8-DIP (0.300, 7.62mm) | 8 | 3.2μA | 2 | -40°C~85°C | Tube | 2009 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 通用型 | Matte Tin (Sn) | 727mW | DUAL | 260 | 2 | 3V | MAX922 | 8 | 3.2μA | CMOS, TTL | 50mA | 12 μs | 5μA | 14000 ns | 80 dB | 2.5V~11V ±1.25V~5.5V | 50mA | 10mV | -0.3V | 5μA | 10mV @ 5V | 80dB CMRR, 80dB PSRR | 9.375mm | 无 | ROHS3 Compliant | 无铅 | |||||||||||||||||||||||||||||||||||||||
![]() | MAX923ESA | Maxim Integrated | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 8-SOIC (0.154, 3.90mm Width) | 8 | 4.5μA | -40°C~85°C | Tube | 2009 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 带电压基准 | Matte Tin (Sn) | DUAL | 鸥翼 | 260 | 2 | 3V | MAX923 | 8 | 4.5μA | CMOS, TTL | 2 | 50mA | 12 μs | 7.5μA | 12 μs | 14000 ns | 80 dB | 2.5V~11V ±1.25V~5.5V | 10mV | 7.5μA | 10mV @ 5V | 50mV | 80dB CMRR, 80dB PSRR | 50mA | 1.5mm | 5mm | 4mm | 无 | Unknown | ROHS3 Compliant | 无铅 | |||||||||||||||||||||||||||||||||||
![]() | MAX516BCWG | Maxim Integrated | 数据表 | 5000 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 24-SOIC (0.295, 7.50mm Width) | YES | 4 | 0°C~70°C | Tube | 2003 | e3 | yes | 活跃 | 1 (Unlimited) | 24 | EAR99 | 通用型 | Matte Tin (Sn) | DUAL | 鸥翼 | 260 | 4 | 4.75V | 1.27mm | 未说明 | MAX516 | 24 | 不合格 | CMOS, TTL | 5/15V | 800 ns | 4.75V~16.5V | 17V | 15000μV | 10mA | 0.3μA @ 16.5V | 1.5μs | ROHS3 Compliant | ||||||||||||||||||||||||||||||||||||||||||||||
![]() | LT6700HS6-1#PBF | Analog Devices, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | PRODUCTION (Last Updated: 1 week ago) | S | 6 | 2 | 125°C | -40°C | 2 | 18V | 1.4V | 29 μs | 10nA | 6mV | 符合RoHS标准 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | LT6700HVHS6-3#PBF | Analog Devices, Inc. | 数据表 | 1250 In Stock | - | 最小起订量: 1 最小包装量: 1 | S | 6 | 125°C | -40°C | 2 | 36V | 1.4V | 18 μs | 6mV | 无SVHC | 符合RoHS标准 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | LT6703HVIS5-3#PBF | Analog Devices, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | S | 5 | 1 | 85°C | -40°C | 1 | 36V | 1.4V | 18 μs | 5mV | 无SVHC | 符合RoHS标准 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | LTC1442CS8 | Analog Devices, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | S | 8 | 2 | 70°C | 0°C | TTL | 2 | 11V | 2V | 500mW | 20μA | 15 μs | 5.7μA | 15 μs | 80 dB | 10mV | 80dB | 5.5V | 1V | 50 mV | 符合RoHS标准 | 含铅 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | LP2901NG4 | Texas Instruments | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | PDIP | 14 | 4 | 8 μs | Non-RoHS Compliant | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | LT6703HDC-3#TRPBF | Analog Devices, Inc. | 数据表 | 3750 In Stock | - | 最小起订量: 1 最小包装量: 1 | PRODUCTION (Last Updated: 2 weeks ago) | 表面贴装 | DFN | 3 | 1 | Tape & Reel (TR) | 通用型 | 125°C | -40°C | 18V | 1.4V | 29 μs | 17μA | 10nA | 13.5 mV | 符合RoHS标准 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | LTC1444CS | Analog Devices, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | S | 16 | 4 | 70°C | 0°C | TTL | 4 | 11V | 11V | 15μA | 12 μs | 8.5μA | 80 dB | 3mV | 50 mV | 符合RoHS标准 | 含铅 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | LTC1445IS | Analog Devices, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | S | 16 | 4 | 85°C | -40°C | TTL | 4 | 11V | 2V | 500mW | 15μA | 12 μs | 8.5μA | 12 μs | 80 dB | 3mV | 80dB | 5.5V | 1V | 50 mV | 无 | 符合RoHS标准 | 含铅 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | MAX983ESA | Maxim Integrated | 数据表 | 587 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 8-SOIC (0.154, 3.90mm Width) | 8 | 6μA | 2 | -40°C~85°C | Tube | 1996 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 带电压基准 | Matte Tin (Sn) | 471mW | DUAL | 鸥翼 | 260 | 2 | 3V | MAX983 | 8 | 6μA | 开漏极态 | 15μA | 6μA | 12 μs | 80 dB | 2.5V~11V ±1.25V~5.5V | 10mV | 10mV @ 5V | 50mV | 80dB CMRR, 80dB PSRR | 0.015mA @ 5V | 无 | Unknown | ROHS3 Compliant | 无铅 | ||||||||||||||||||||||||||||||||||||||||
![]() | MAX913MJA | Maxim Integrated | 数据表 | 20 In Stock | - | 最小起订量: 1 最小包装量: 1 | 通孔 | 通孔 | 8-CDIP (0.300, 7.62mm) | 1 | 0°C~70°C | Bag | 2003 | e0 | no | Obsolete | 1 (Unlimited) | 8 | EAR99 | with Latch | Tin/Lead (Sn/Pb) | DUAL | 245 | 1 | 5V | 2.54mm | not_compliant | 未说明 | MAX913 | 8 | R-GDIP-T8 | 不合格 | Complementary, TTL | 5/+-5V | 20mA | 14 ns | 10mA | 10 ns | 100 dB | 5V~10V | 2mV | -5V | 7V | 5μA | -7V | 2mV @ ±5V | 5μA @ ±5V | 110dB CMRR, 100dB PSRR | 14ns | Non-RoHS Compliant | ||||||||||||||||||||||||||||||||||||||
![]() | MAX9022AUA T | Maxim Integrated | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) | 8 | 5.6μA | 2 | -40°C~125°C | Tape & Reel (TR) | 2007 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 通用型 | Matte Tin (Sn) | 727mW | DUAL | 鸥翼 | 260 | 2 | 5V | 0.65mm | MAX9022 | 8 | 5.6μA | CMOS, Rail-to-Rail, TTL | 8 μs | 5μA | 8000 ns | 80 dB | 2.5V~5.5V ±1.25V~2.75V | 1mV | 6V | 3nA | 3nA | 5μA | 1mV @ 5V | 0.003μA @ 5V | 4mV | 100dB CMRR, 80dB PSRR | 1.1mm | 3mm | 3mm | 无 | ROHS3 Compliant | 无铅 | |||||||||||||||||||||||||||||||||
![]() | MAX989ESA T | Maxim Integrated | 数据表 | 40 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | Tin | 表面贴装 | 表面贴装 | 8-SOIC (0.154, 3.90mm Width) | 8 | 40μA | 2 | -40°C~85°C | Tape & Reel (TR) | 2012 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 通用型 | 727mW | DUAL | 鸥翼 | 260 | 2 | 5V | MAX989 | 8 | 40μA | CMOS, Push-Pull, Rail-to-Rail, TTL | 300 ns | 24μA | 300 ns | 80 dB | 2.5V~5.5V ±1.25V~2.75V | 5mV | 0.01μA | 80dB | 6V | 1pA | 1pA | 5mV @ 5.5V | 1pA @ 5.5V | ±3mV | 80dB CMRR, 80dB PSRR | 450ns | 1.75mm | 4.9mm | 3.9mm | 无 | ROHS3 Compliant | 无铅 | ||||||||||||||||||||||||||||||||
![]() | MAX988EXK T | Maxim Integrated | 数据表 | 5000 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 5-TSSOP, SC-70-5, SOT-353 | 5 | 80μA | 1 | -40°C~85°C | Tape & Reel (TR) | 2007 | e3 | yes | 活跃 | 1 (Unlimited) | 5 | EAR99 | 通用型 | Matte Tin (Sn) | 571mW | DUAL | 鸥翼 | 260 | 1 | 2.7V | MAX988 | 5 | 80μA | CMOS, Open-Drain, Rail-to-Rail, TTL | 210 ns | 96μA | 210 ns | 80 dB | 2.5V~5.5V ±1.25V~2.75V | 5mV | 80dB | 6V | 1pA | 96μA | 5mV @ 5.5V | 1pA @ 5.5V | ±2.5mV | 80dB CMRR, 80dB PSRR | 2mm | 无 | ROHS3 Compliant | 无铅 | ||||||||||||||||||||||||||||||||||||
![]() | MAX9015AEKA T | Maxim Integrated | 数据表 | 502 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | SOT-23-8 | 8 | 1.7μA | 1 | -40°C~85°C | Tape & Reel (TR) | 2012 | Beyond-the-Rails™ | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 带电压基准 | Matte Tin (Sn) | 727mW | DUAL | 鸥翼 | 260 | 1 | 5V | 0.65mm | MAX9015 | 8 | 1.7μA | CMOS, Push-Pull, Rail-to-Rail | 5V | 50mA | 28 μs | 2μA | 28000 ns | 80 dB | 1.8V~5.5V | 5mV | 80dB | 6V | 1nA | 1nA | 2μA | 5mV @ 5V | 0.001μA @ 5V | 4mV | 80dB PSRR | 2.9mm | 无 | Unknown | ROHS3 Compliant | 无铅 | ||||||||||||||||||||||||||||||
![]() | MAX9030AXT T | Maxim Integrated | 数据表 | 2500 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 6-TSSOP, SC-88, SOT-363 | 6 | 35μA | 1 | -40°C~125°C | Tape & Reel (TR) | 2010 | e4 | yes | 活跃 | 1 (Unlimited) | 6 | EAR99 | 通用型 | Nickel/Palladium/Gold (Ni/Pd/Au) | 245mW | DUAL | 鸥翼 | 260 | 1 | 5V | MAX9030 | 6 | 35μA | CMOS, Rail-to-Rail, TTL | 3/5V | 228 ns | 55μA | 100 dB | 2.5V~5.5V | 1mV | 0.08μA | 100dB | 6V | 8nA | 8nA | 55μA | 1mV @ 5V | 0.008μA @ 5V | 4mV | 100dB CMRR, 100dB PSRR | 1mm | 2.15mm | 1.35mm | 无 | Unknown | ROHS3 Compliant | 无铅 | |||||||||||||||||||||||||||||||
![]() | MAX9024ASD | Maxim Integrated | 数据表 | 94 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 14-SOIC (0.154, 3.90mm Width) | 14 | 2.8μA | 4 | -40°C~125°C | Tube | 2007 | e3 | yes | 活跃 | 1 (Unlimited) | 14 | EAR99 | 通用型 | Matte Tin (Sn) | 667mW | DUAL | 鸥翼 | 260 | 4 | 5V | 1.27mm | MAX9024 | 14 | 2.8μA | CMOS, Rail-to-Rail, TTL | +-1.25/+-2.75/2.5/5.5V | 8 μs | 5μA | 8000 ns | 80 dB | 2.5V~5.5V ±1.25V~2.75V | 1mV | 0.08μA | 6V | 3nA | 80nA | 5μA | 1mV @ 5V | 0.003μA @ 5V | 4mV | 100dB CMRR, 80dB PSRR | 1.75mm | 8.65mm | 3.9mm | 无 | ROHS3 Compliant | 无铅 | |||||||||||||||||||||||||||||||
![]() | MAX987ESA | Maxim Integrated | 数据表 | 4 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 8-SOIC (0.154, 3.90mm Width) | 8 | 80μA | 1 | -40°C~85°C | Tube | 2007 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 通用型 | Matte Tin (Sn) | 471mW | DUAL | 鸥翼 | 260 | 1 | 2.7V | MAX987 | 8 | 80μA | CMOS, Push-Pull, Rail-to-Rail, TTL | 210 ns | 96μA | 210 ns | 80 dB | 2.5V~5.5V ±1.25V~2.75V | 5mV | 80dB | 6V | 1pA | 1pA | 96μA | 5mV @ 5.5V | 1pA @ 5.5V | ±2.5mV | 80dB CMRR, 80dB PSRR | 1.5mm | 5mm | 4mm | 无 | 无SVHC | ROHS3 Compliant | 无铅 | ||||||||||||||||||||||||||||||||
![]() | MAX967ESA | Maxim Integrated | 数据表 | 18 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 8-SOIC (0.154, 3.90mm Width) | 8 | 10μA | 2 | -40°C~85°C | Tube | 2007 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 带电压基准 | Matte Tin (Sn) | 471mW | DUAL | 鸥翼 | 260 | 2 | 3V | MAX967 | 8 | 10μA | Open-Drain, Rail-to-Rail | 1.5/5.5V | 20 μs | 16μA | 20000 ns | 56.48 dB | 1.6V~5.5V | 7mV | 0.005μA | 80dB | 6V | 50nA | 16μA | 7mV @ 5.5V | 0.05μA @ 5.5V | ±1mV | 56.48dB CMRR, 80dB PSRR | 无 | ROHS3 Compliant | 无铅 | |||||||||||||||||||||||||||||||||||
![]() | MAX923EPA | Maxim Integrated | 数据表 | 45 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 通孔 | 通孔 | 8-DIP (0.300, 7.62mm) | 8 | 4.5μA | 2 | -40°C~85°C | Tube | 2009 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 带电压基准 | Matte Tin (Sn) | 330mW | DUAL | 260 | 2 | 3V | MAX923 | 8 | 4.5μA | CMOS, TTL | 50mA | 12 μs | 7.5μA | 14000 ns | 80 dB | 2.5V~11V ±1.25V~5.5V | 10mV | -0.3V | 10mV @ 5V | 50mV | 80dB CMRR, 80dB PSRR | 12μs | 9.375mm | 无 | ROHS3 Compliant | 无铅 | |||||||||||||||||||||||||||||||||||||||
![]() | MAX920ESA | Maxim Integrated | 数据表 | 299 In Stock | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 8-SOIC (0.154, 3.90mm Width) | 8 | 800nA | 1 | -40°C~85°C | Tube | 2010 | Beyond-the-Rails™ | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 通用型 | Matte Tin (Sn) | 571mW | DUAL | 鸥翼 | 260 | 1 | 5V | MAX920 | 8 | 800nA | Open-Drain, Rail-to-Rail | 2/5V | 50mA | 12 μs | 1.2μA | 120000 ns | 80 dB | 1.8V~5.5V | 5mV | 0.002μA | 6V | 1nA | 5mV @ 5V | 0.001μA @ 5V | 4mV | 66.02dB CMRR, 80dB PSRR | 12μs | 4.9mm | 3.9mm | 无 | ROHS3 Compliant | 无铅 | ||||||||||||||||||||||||||||||||
![]() | MAX9052BESA | Maxim Integrated | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 表面贴装 | 8-SOIC (0.154, 3.90mm Width) | 8 | 130μA | 2 | -40°C~85°C | Tube | 2012 | e3 | yes | Obsolete | 1 (Unlimited) | 8 | EAR99 | 带电压基准 | Matte Tin (Sn) | 471mW | DUAL | 鸥翼 | 260 | 2 | 5V | MAX9052 | 8 | 130μA | CMOS, Push-Pull, Rail-to-Rail, TTL | 3/5V | 8mA | 450 ns | 130μA | 400 ns | 400 ns | 80 dB | 2.7V~5.5V | 1mV | 6V | 1pA | 1mV @ 5V | 1pA @ 5V | ±3mV | 80dB CMRR, 80dB PSRR | 450ns | 1.75mm | 4.9mm | 3.9mm | 无 | ROHS3 Compliant | 无铅 | ||||||||||||||||||||||||||||||||
![]() | MAX972CPA | Maxim Integrated | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 通孔 | 通孔 | 8-DIP (0.300, 7.62mm) | 4.5μA | 2 | 0°C~70°C | Tube | 2003 | e3 | yes | 活跃 | 1 (Unlimited) | 8 | EAR99 | 通用型 | Matte Tin (Sn) | 471mW | DUAL | 260 | 2 | 3V | MAX972 | 8 | R-PDIP-T8 | 4.5μA | 开漏极态 | 15μA | 4μA | 300000 ns | 80 dB | 2.5V~11V ±1.25V~5.5V | 10mV | 10mV @ 5V | 80dB CMRR, 80dB PSRR | 0.015mA @ 5V | 9.375mm | 无 | ROHS3 Compliant | 无铅 |
MAX922EPA
Maxim Integrated
分类:Linear - Comparators
MAX923ESA
Maxim Integrated
分类:Linear - Comparators
MAX516BCWG
Maxim Integrated
分类:Linear - Comparators
LT6700HS6-1#PBF
Analog Devices, Inc.
分类:Linear - Comparators
LT6700HVHS6-3#PBF
Analog Devices, Inc.
分类:Linear - Comparators
LT6703HVIS5-3#PBF
Analog Devices, Inc.
分类:Linear - Comparators
LTC1442CS8
Analog Devices, Inc.
分类:Linear - Comparators
LP2901NG4
Texas Instruments
分类:Linear - Comparators
LT6703HDC-3#TRPBF
Analog Devices, Inc.
分类:Linear - Comparators
LTC1444CS
Analog Devices, Inc.
分类:Linear - Comparators
LTC1445IS
Analog Devices, Inc.
分类:Linear - Comparators
MAX983ESA
Maxim Integrated
分类:Linear - Comparators
MAX913MJA
Maxim Integrated
分类:Linear - Comparators
MAX9022AUA T
Maxim Integrated
分类:Linear - Comparators
MAX989ESA T
Maxim Integrated
分类:Linear - Comparators
MAX988EXK T
Maxim Integrated
分类:Linear - Comparators
MAX9015AEKA T
Maxim Integrated
分类:Linear - Comparators
MAX9030AXT T
Maxim Integrated
分类:Linear - Comparators
MAX9024ASD
Maxim Integrated
分类:Linear - Comparators
MAX987ESA
Maxim Integrated
分类:Linear - Comparators
MAX967ESA
Maxim Integrated
分类:Linear - Comparators
MAX923EPA
Maxim Integrated
分类:Linear - Comparators
MAX920ESA
Maxim Integrated
分类:Linear - Comparators
MAX9052BESA
Maxim Integrated
分类:Linear - Comparators
MAX972CPA
Maxim Integrated
分类:Linear - Comparators
