category.集成电路IC_category.集成电路IC品牌厂家，型号_价格_规格

类别是'category.数模转换器（DAC）' (10000)

所有品牌

产品型号	品牌	数据表	库存	价格(含增值税)	数量	工厂交货时间	触点镀层	底架	安装类型	包装/外壳	表面安装	引脚数	质量	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	终端	ECCN 代码	端子表面处理	最大功率耗散	电压 - 供电	端子位置	终端形式	峰值回流焊温度（摄氏度）	功能数量	端子间距	时间@峰值回流温度-最大值(s)	基本部件号	资历状况	输出类型	极性	电源	界面	功率耗散	比特数	最大输出电压	最小输入电压	压摆率	建筑学	最大输入电压	转换器类型	电源类型	参考类型	数据接口	差分输出	决议案	采样率	电压 - 供电，模拟	最小输出电压	电压 - 供电，数字	结算时间	最大双电源电压	消耗功率	线性度误差-最大值 (EL)	积分非线性(INL)	最小双电源电压	输入位代码	双电源电压	转换器数量	转换率	INL/DNL(LSB)	信噪比(SNR)	负供电电压	输入格式	D/A转换器数量	模拟输出电压-最大值	微分非线性	电压 - 供电（最大值）	电压 - 供电（最小值）	DAC通道数	模拟输出电压-最小值	高度	座位高度(最大)	长度	宽度	器件厚度	辐射硬化	达到SVHC	RoHS状态	无铅
DAC7716SPFB	Texas Instruments	数据表	N/A	-	最小起订量: 1 最小包装量: 1	6 Weeks	Gold		表面贴装	48-TQFP	YES	48			-40°C~105°C	Tray			e4	yes	ACTIVE (Last Updated: 2 days ago)	2 (1 Year)	48		EAR99		290mW	5V	QUAD	鸥翼	260	1	0.5mm		DAC7716		Voltage - Buffered	Bipolar, Unipolar	5+-11/+-18V			12				R-2R		D/A CONVERTER	Analog, Digital, Dual	External	SPI	无	1.5 B		4.75V~24V -4.75V~-18V		2.7V~5.5V	7μs (Typ)		260mW		1 LSB	4.75V	BINARY, 2'S COMPLEMENT BINARY		4		±1 (Max), ±1 (Max)		-16.5V	SERIAL			1 LSB					1.2mm		7mm	7mm	1mm			ROHS3 Compliant	无铅
AD5724RBREZ-REEL7	Analog Devices Inc.	数据表	16 In Stock	-	最小起订量: 1 最小包装量: 1	10 Weeks	Tin		表面贴装	24-TSSOP (0.173, 4.40mm Width) Exposed Pad	YES	24			-40°C~85°C	Tape & Reel (TR)		iCMOS®	e3	no	PRODUCTION (Last Updated: 4 weeks ago)	3 (168 Hours)	24		EAR99		310mW	5V		鸥翼	260	1	0.65mm	40	AD5724		Voltage - Buffered	Bipolar, Unipolar		SPI, Serial	310mW	12	21.6V	2.5V	3.5 V/μs	字符串 DAC	2.5V	D/A CONVERTER	Analog, Digital, Dual	External, Internal	SPI, DSP	无	1.5 B	1.1 Msps	±4.5V~16.5V	5V	2.7V~5.5V	12μs	16.5V			1 LSB	4.5V	BINARY, OFFSET BINARY, 2'S COMPLEMENT BINARY		4	1.1 Msps	±1 (Max), ±1 (Max)		-5V					16.5V	4.5V				1.2mm	7.8mm					ROHS3 Compliant	含铅
AD5683RBCPZ-1RL7	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Gold	表面贴装	表面贴装	8-UFDFN Exposed Pad, CSP		8			-40°C~105°C	Tape & Reel (TR)		nanoDAC+®	e4	no	PRODUCTION (Last Updated: 3 weeks ago)	1 (Unlimited)	8					3V	DUAL		260	1	0.5mm	30	AD5683		Voltage - Buffered	Unipolar				16		1V		字符串 DAC	5.5V	D/A CONVERTER		External, Internal	SPI	无	2 B		2.7V~5.5V		1.8V~5.5V	7μs			0.0046%	2 LSB		BINARY				±3 (Max), ±1 (Max)	90 dB		SERIAL	1	5.005V		5.5V	2.7V				0.65mm	2mm	2mm				ROHS3 Compliant	含铅
AD7945BRSZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Tin		表面贴装	20-SSOP (0.209, 5.30mm Width)	YES	20		5μA	-40°C~85°C	Tube			e3	no	PRODUCTION (Last Updated: 3 months ago)	1 (Unlimited)	20		EAR99			5V	DUAL	鸥翼	260	1	0.65mm	40	AD7945		Current - Unbuffered	Bipolar, Unipolar	5V		25μW	12	20V	-10V		R-2R	10V	D/A CONVERTER		External	Parallel	无	1.5 B	1.7 Msps	5V	0V		600μs (Typ)				0.5 LSB		BINARY, OFFSET BINARY		1	1.7 Msps	±0.5 (Max), ±0.5 (Max)							5.5V	4.5V			1.78mm		7.5mm	5.3mm			无SVHC	ROHS3 Compliant	含铅
MCP4726A1T-E/CH	Microchip Technology	数据表	N/A	-	最小起订量: 1 最小包装量: 1	14 Weeks		表面贴装	表面贴装	SOT-23-6		6		210μA	-40°C~125°C	Tape & Reel (TR)	2011		e3		活跃	1 (Unlimited)	6		EAR99	Matte Tin (Sn) - annealed	452mW	5.5V	DUAL	鸥翼	260	1	0.95mm	40	MCP4726		Voltage - Buffered	Bipolar	3/5V	2-Wire, I2C, Serial		12				R-2R		D/A CONVERTER		External, Supply	I2C	无	1.5 B		2.7V~5.5V		2.7V~5.5V	6μs (Typ)			0.354%	14.5 LSB		BINARY		1		±2, ±0.2							5.5V	2.7V			1.3mm		3.1mm	1.8mm				ROHS3 Compliant
AD664BE	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	12 Weeks	Gold		表面贴装	44-CLCC	YES	44			-40°C~85°C	Tube			e4	no	PRODUCTION (Last Updated: 3 months ago)	1 (Unlimited)	44		EAR99			15V	QUAD		260	4	1.27mm	40	AD664		Voltage - Buffered	Bipolar, Unipolar			525mW	12	26V	-13V		R-2R	13V	D/A CONVERTER		External	Parallel	无	1.5 B	125 ksps	±11.4V~16.5V	0V	5V	10μs	16.5V		0.0183%	0.75 LSB	11.4V	BINARY	15V	4	125 ksps	±0.5, ±0.5 (Max)		-15V																Non-RoHS Compliant	含铅
AD5321BRMZ-REEL7	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Tin	表面贴装	表面贴装	8-TSSOP, 8-MSOP (0.118, 3.00mm Width)		8			-40°C~105°C	Tape & Reel (TR)			e3	no	PRODUCTION (Last Updated: 2 weeks ago)	1 (Unlimited)	8		EAR99		1.4mW	3V	DUAL	鸥翼	260	1	0.65mm	30	AD5321		Voltage - Buffered	Unipolar	3/5V	2-Wire, I2C, SPI, Serial	1.4mW	12	5.5V	2.5V	0.7 V/μs	字符串 DAC	5.5V	D/A CONVERTER	Single	Supply	I2C	无	1.5 B	125 ksps	2.5V~5.5V	2.5V	2.5V~5.5V	10μs			0.3906%	16 LSB		BINARY		1	125 ksps	±2, ±0.3							5.5V	2.5V					3mm	3mm				ROHS3 Compliant	含铅
AD5348BRUZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Tin		表面贴装	38-TFSOP (0.173, 4.40mm Width)	YES	38		1mA	-40°C~105°C	Tube			e3	no	PRODUCTION (Last Updated: 3 weeks ago)	3 (168 Hours)	38		EAR99		8.3mW	5V	DUAL	鸥翼	260	1	0.5mm	40	AD5348		Voltage - Buffered	Unipolar			8.3mW	12	5.5V	250mV	0.7 V/μs	字符串 DAC	5.5V	D/A CONVERTER		External	Parallel	无	1.5 B	125 ksps	2.5V~5.5V	250mV	2.5V~5.5V	10μs			0.3906%	16 LSB		BINARY		8	125 ksps	±2, ±0.2							5.5V	2.5V			1.05mm		9.7mm	4.4mm			无SVHC	ROHS3 Compliant	含铅
AD7547JRZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Tin		表面贴装	24-SOIC (0.295, 7.50mm Width)	YES	24			-40°C~85°C	Tube			e3	no	PRODUCTION (Last Updated: 1 month ago)	3 (168 Hours)	24		EAR99		450mW	15V	DUAL	鸥翼	260	2		30	AD7547		Current - Unbuffered				30mW	12	20V	10V		R-2R	-10V	D/A CONVERTER		External	Parallel	无	1.5 B	667 ksps	10.8V~16.5V	0V	10.8V~16.5V	1.5μs				1 LSB		BINARY		2	667 ksps	±1 (Max), ±1 (Max)							16.5V	10.8V			2.35mm		15.6mm	7.6mm			无SVHC	ROHS3 Compliant	含铅
AD5444YRMZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	12 Weeks	Tin		表面贴装	10-TFSOP, 10-MSOP (0.118, 3.00mm Width)	YES	10			-40°C~125°C	Tube			e3	no	PRODUCTION (Last Updated: 1 month ago)	1 (Unlimited)	10		EAR99		50.5μW	5V	DUAL	鸥翼	260	1	0.5mm	30	AD5444		Current - Unbuffered			SPI, Serial	3μW	12	20V	-10V		R-2R	10V	D/A CONVERTER		External	SPI, DSP	有	1.5 B	2.7 Msps	2.5V~5.5V	0V	2.5V~5.5V	110ns				0.5 LSB		BINARY		1	2.7 Msps	±0.5 (Max), ±1 (Max)							5.5V	2.5V			850μm		3mm	3mm		无	无SVHC	ROHS3 Compliant	含铅
AD561JD	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	10 Weeks	Lead, Tin	通孔	通孔	16-CDIP (0.300, 7.62mm)		16			0°C~70°C	Tube			e0	no	PRODUCTION (Last Updated: 4 days ago)	1 (Unlimited)	16		EAR99	Tin/Lead (Sn63Pb37)		5V	DUAL			1	2.54mm		AD561		Current - Unbuffered	Bipolar, Unipolar				10				R-2R		D/A CONVERTER		Internal	Parallel	无	1.25 B		4.5V~16.5V -10.8V~16.5V		4.5V~16.5V	250ns (Typ)	16.5V		0.05%	0.5 LSB		BINARY		1		±0.25, ±0.5		-15V					16.5V	4.5V		-2V		3.553mm	20.32mm	7.62mm			无SVHC	Non-RoHS Compliant	含铅
TLC5628CDWR	Texas Instruments	数据表	N/A	-	最小起订量: 1 最小包装量: 1	6 Weeks	Gold		表面贴装	16-SOIC (0.295, 7.50mm Width)	YES	16	420.395078mg	4mA	0°C~70°C	Tape & Reel (TR)			e4	yes	ACTIVE (Last Updated: 3 days ago)	1 (Unlimited)	16		EAR99		15mW	5V	DUAL	鸥翼	260	8	1.27mm		TLC5628		Voltage - Buffered	Unipolar	5V			8				字符串 DAC		D/A CONVERTER	Single	External	SPI	无	1 B	45 ksps	5V			10μs (Typ)		15mW	0.3906%	1 LSB		BINARY		8	45 ksps	±1 (Max), ±0.9 (Max)			SERIAL			0.9 LSB	5.25V	4.75V			2.65mm		10.3mm	7.5mm	2.35mm			ROHS3 Compliant	无铅
AD5663RBCPZ-3R2	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Tin		表面贴装	10-VFDFN Exposed Pad, CSP	YES	10			-40°C~105°C	Tape & Reel (TR)		nanoDAC®	e3	no	PRODUCTION (Last Updated: 2 weeks ago)	1 (Unlimited)	10		EAR99		5mW	3.3V	DUAL		260	1	0.5mm		AD5663		Voltage - Buffered	Bipolar, Unipolar	3.3/5V	SPI, Serial		16		750mV		字符串 DAC		D/A CONVERTER		External, Internal	SPI, DSP	无	2 B	220 ksps	2.7V~3.6V	750mV	2.7V~3.6V	7μs				16 LSB		BINARY		2	220 ksps	±8, ±1 (Max)							3.6V	2.7V			800μm		3.1mm	3.1mm			无SVHC	ROHS3 Compliant	含铅
AD9744ARZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	16 Weeks	Tin		表面贴装	28-SOIC (0.295, 7.50mm Width)	YES	28		33mA	-40°C~85°C	Tube		TxDAC®	e3	no	PRODUCTION (Last Updated: 2 weeks ago)	1 (Unlimited)	28		EAR99		145mW	3.3V	DUAL	鸥翼	260	1		30	AD9744		Current - Unbuffered	Unipolar			145mW	14		100mV		当前来源	1.25V	D/A CONVERTER		External, Internal	Parallel	有	1.75 B	210 Msps	2.7V~3.6V		2.7V~3.6V	11ns (Typ)			0.0305%	5 LSB		BINARY, 2'S COMPLEMENT BINARY		1	210 Msps	±0.8, ±0.5	88 dB						3.6V	2.7V			2.65mm		18.1mm	7.6mm		无	无SVHC	ROHS3 Compliant	含铅
AD7839ASZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	16 Weeks	Tin		表面贴装	44-QFP	YES	44		8mA	-40°C~85°C	Tray			e3	no	PRODUCTION (Last Updated: 1 month ago)	3 (168 Hours)	44	SMD/SMT	EAR99		303mW	15V	QUAD	鸥翼	260	1		40	AD7839		Voltage - Buffered	Bipolar, Unipolar			303mW	13	20V	2V		R-2R	10V	D/A CONVERTER		External	Parallel	无	1.625 B	33 ksps	±14.25V~15.75V	4V	5V	40μs	15.75V			2 LSB	14.25V	BINARY	15V	8	33 ksps	±2 (Max), ±0.9 (Max)		-15V					15.75V	14.25V			2mm		10mm	10mm				ROHS3 Compliant	含铅
DAC7563SDGSR	Texas Instruments	数据表	10000 In Stock	-	最小起订量: 1 最小包装量: 1	6 Weeks	Gold		表面贴装	10-TFSOP, 10-MSOP (0.118, 3.00mm Width)	YES	10			-40°C~125°C	Cut Tape (CT)			e4	yes	ACTIVE (Last Updated: 6 days ago)	2 (1 Year)	10		EAR99		7.15mW	3.6V	DUAL	鸥翼	260	1	0.5mm		DAC7563		Voltage - Buffered	Unipolar	3/5V	SPI		12				字符串 DAC		D/A CONVERTER	Single	External, Internal	SPI, DSP	无	1.5 B	0.1 MHz	2.7V~5.5V		2.7V~5.5V	10μs (Typ)			0.0183%	0.75 LSB		BINARY				±0.3, ±0.05			SERIAL			0.25 LSB	5.5V	2.7V	2		1.07mm		3mm	3mm	1.02mm			ROHS3 Compliant	无铅
AD5755ACPZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Tin	表面贴装	表面贴装	64-VFQFN Exposed Pad, CSP		64			-40°C~105°C	Tray			e3	no	PRODUCTION (Last Updated: 4 weeks ago)	3 (168 Hours)	64		EAR99		173mW	5V	QUAD			1	0.5mm		AD5755		Voltage - Buffered, Current - Unbuffered	Bipolar, Unipolar		SPI, Serial	173mW	16	20V	5V	1.9 V/μs	R-2R	5V	D/A CONVERTER		External, Internal	SPI, DSP	无	2 B	91 ksps	9V~33V -10.8V~26.4V	5V	2.7V~5.5V	18μs			0.008%	1 LSB		BINARY	5V	4	91 ksps	-, ±1 (Max)		-15V					5.5V	2.7V			800μm		9.1mm	9.1mm			无SVHC	ROHS3 Compliant	含铅
DAC312FR	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Lead, Tin		通孔	20-CDIP (0.300, 7.62mm)	NO	20			-40°C~85°C	Tube			e0	no	PRODUCTION (Last Updated: 3 weeks ago)	1 (Unlimited)	20		EAR99	Tin/Lead (Sn63Pb37)	375mW	15V				1	2.54mm		DAC312		Current - Unbuffered	Unipolar			267mW	12				R-2R		D/A CONVERTER	Dual	External	Parallel	有	1.5 B		4.5V~18V -10.8V~18V		20V~36V	500ns	18V		0.05%			BINARY, OFFSET BINARY, 2'S COMPLEMENT BINARY	15V	1		-, ±1 (Max)		-15V								-5V		5.08mm		7.62mm		无	Unknown	Non-RoHS Compliant	含铅
AD7391ARZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Tin		表面贴装	8-SOIC (0.154, 3.90mm Width)	YES	8		55μA	-40°C~125°C	Tube			e3	no	PRODUCTION (Last Updated: 3 weeks ago)	1 (Unlimited)	8	SMD/SMT	EAR99		500μW	5V	DUAL	鸥翼	260	1		30	AD7391		Voltage - Buffered	Unipolar		SPI, Serial	500μW	10	5.5V	0V		R-2R	5.5V	D/A CONVERTER		External	SPI	无	1.25 B	17 ksps	2.7V~5.5V	0V	2.7V~5.5V	70μs (Typ)				2 LSB		BINARY		1	17 ksps	±2 (Max), ±0.9 (Max)							5.5V	2.7V			1.5mm		5mm	4mm			无SVHC	ROHS3 Compliant	含铅
AD5744RCSUZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	10 Weeks	Tin		表面贴装	32-TQFP	YES	32			-40°C~85°C	Tray		iCMOS®	e3	no	PRODUCTION (Last Updated: 2 weeks ago)	3 (168 Hours)	32		EAR99		387mW	13.5V	QUAD	鸥翼	260	1	0.8mm		AD5744		Voltage - Buffered	Bipolar		SPI, Serial	275mW	14	14V	1V	5 V/μs	R-2R	7V	D/A CONVERTER		External, Internal	SPI, DSP	无	1.75 B	1 Msps	±11.4V~16.5V	2V	2.7V~5.25V	10μs	16.5V		0.0061%	1 LSB	11.4V	OFFSET BINARY, 2'S COMPLEMENT BINARY	15V	4	1 Msps	±1 (Max), ±1 (Max)		-13.5V					5.5V	2.7V			1mm		7mm	7mm			无SVHC	ROHS3 Compliant	含铅
DAC8775IRWFT	Texas Instruments	数据表	N/A	-	最小起订量: 1 最小包装量: 1	6 Weeks			表面贴装	72-VFQFN Exposed Pad	YES	72			-40°C~125°C TA	Tape & Reel (TR)		DAC8775	e4	yes	ACTIVE (Last Updated: 5 days ago)	3 (168 Hours)	72		EAR99	Nickel/Palladium/Gold (Ni/Pd/Au)		15V	QUAD			1	0.5mm				模拟电流和电压					16				字符串 DAC		D/A CONVERTER		External, Internal	SPI	无		0.033 MHz	12V~36V		2.7V~5.5V	30μs						BINARY, 2'S COMPLEMENT BINARY				±12, ±1 (Max)			SERIAL	4	12V					-12V	1mm		10mm	10mm	900μm			ROHS3 Compliant
AD5443YRMZ-REEL7	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	8 Weeks	Tin		表面贴装	10-TFSOP, 10-MSOP (0.118, 3.00mm Width)	YES	10			-40°C~125°C	Tape & Reel (TR)			e3	no	PRODUCTION (Last Updated: 4 weeks ago)	1 (Unlimited)	10		EAR99		25μW		DUAL	鸥翼	260	1	0.5mm	30	AD5443	不合格	Current - Unbuffered		3/5V	SPI, Serial	3μW	12	20V	-10V		R-2R	10V	D/A CONVERTER		External	SPI, DSP	有	1.5 B	2.47 Msps	2.5V~5.5V	0V	2.5V~5.5V	160ns			0.0244%	1 LSB		BINARY		1	2.5 Msps	±1 (Max), -1/+2 (Max)							5.5V	3V					3mm	3mm				ROHS3 Compliant	含铅
DAC8571IDGKR	Texas Instruments	数据表	N/A	-	最小起订量: 1 最小包装量: 1	6 Weeks	Gold		表面贴装	8-TSSOP, 8-MSOP (0.118, 3.00mm Width)	YES	8	25.996513mg	250μA	-40°C~105°C	Cut Tape (CT)			e4	yes	ACTIVE (Last Updated: 4 days ago)	2 (1 Year)	8		EAR99			5V	DUAL	鸥翼	260	1	0.65mm		DAC8571		Voltage - Buffered	Unipolar				16				字符串 DAC		D/A CONVERTER	Single	External	I2C	无	2 B	43 ksps	2.7V~5.5V		2.7V~5.5V	15μs		420μW		65 LSB		BINARY		1	43 ksps	-, ±0.25	96 dB		SERIAL			1 LSB	5.5V	2.7V			1.07mm		3mm	3mm	970μm			ROHS3 Compliant	无铅
AD7841ASZ	Analog Devices Inc.	数据表	N/A	-	最小起订量: 1 最小包装量: 1	16 Weeks	Tin		表面贴装	44-QFP	YES	44		10mA	-40°C~85°C	Tray			e3	no	PRODUCTION (Last Updated: 3 months ago)	3 (168 Hours)	44		EAR99		303mW	15V	QUAD	鸥翼	260	1		40	AD7841		Voltage - Buffered	Bipolar, Unipolar			303mW	14	20V	2V	0.7 V/μs	R-2R	10V	D/A CONVERTER		External	Parallel	无	1.75 B	32 ksps	±13.5V~16.5V	4V	5V	31μs (Typ)	16.5V			4 LSB	13.5V	BINARY	15V	8	32 ksps	±4 (Max), -0.9/+2 (Max)		-15V					16.5V	13.5V			2mm		10mm	10mm			无SVHC	ROHS3 Compliant	含铅
AD5623RACPZ-5REEL7	Analog Devices Inc.	数据表	6000 In Stock	-	最小起订量: 1 最小包装量: 1	8 Weeks		表面贴装	表面贴装	10-VFDFN Exposed Pad, CSP		10			-40°C~105°C	Tape & Reel (TR)		nanoDAC®	e3	no	PRODUCTION (Last Updated: 1 month ago)	1 (Unlimited)	10		EAR99	Matte Tin (Sn)	5mW	5V	DUAL		260	1	0.5mm	30	AD5623		Voltage - Buffered	Unipolar	5V	SPI, Serial	2.5mW	12	5V	1.25V	1.8 V/μs	字符串 DAC	2.5V	D/A CONVERTER	Single	External, Internal	SPI, DSP	无	1.5 B	287 ksps		2.5V		4.5μs			0.3906%	2 LSB		BINARY			287 ksps	±1, ±1 (Max)							5.5V	2.7V	2			0.85mm	3mm	3mm				ROHS3 Compliant	含铅