LM334

現行

0°C 至 70°C 3 接腳可調整電流源

產品詳細資料

Iout/Iz (max) (mA) 0.01 Vin (min) (V) 0.8 Vin (max) (V) 40 Operating temperature range (°C) -40 to 85 Initial accuracy (max) (%) 6 Rating Catalog
Iout/Iz (max) (mA) 0.01 Vin (min) (V) 0.8 Vin (max) (V) 40 Operating temperature range (°C) -40 to 85 Initial accuracy (max) (%) 6 Rating Catalog
SOIC (D) 8 29.4 mm² 4.9 x 6 TO-92 (LP) 3 19.136 mm² 5.2 x 3.68 WAFERSALE (YS) See data sheet
  • Operates From 1V to 40V
  • 0.02%/V Current Regulation
  • Programmable From 1µA to 10mA
  • True 2-Terminal Operation
  • Available as Fully Specified Temperature Sensor
  • ±3% Initial Accuracy

All trademarks are the property of their respective owners.

  • Operates From 1V to 40V
  • 0.02%/V Current Regulation
  • Programmable From 1µA to 10mA
  • True 2-Terminal Operation
  • Available as Fully Specified Temperature Sensor
  • ±3% Initial Accuracy

All trademarks are the property of their respective owners.

The LM134/LM234/LM334 are 3-terminal adjustable current sources featuring 10,000:1 range in operating current, excellent current regulation and a wide dynamic voltage range of 1V to 40V. Current is established with one external resistor and no other parts are required. Initial current accuracy is ±3%. The LM134/LM234/LM334 are true floating current sources with no separate power supply connections. In addition, reverse applied voltages of up to 20V will draw only a few dozen microamperes of current, allowing the devices to act as both a rectifier and current source in AC applications.

The sense voltage used to establish operating current in the LM134 is 64mV at 25°C and is directly proportional to absolute temperature (°K). The simplest one external resistor connection, then, generates a current with ≈+0.33%/°C temperature dependence. Zero drift operation can be obtained by adding one extra resistor and a diode.

Applications for the current sources include bias networks, surge protection, low power reference, ramp generation, LED driver, and temperature sensing. The LM234-3 and LM234-6 are specified as true temperature sensors with ensured initial accuracy of ±3°C and ±6°C, respectively. These devices are ideal in remote sense applications because series resistance in long wire runs does not affect accuracy. In addition, only 2 wires are required.

The LM134 is specified over a temperature range of −55°C to +125°C, the LM234 from −25°C to +100°C and the LM334 from 0°C to +70°C. These devices are available in TO hermetic, TO-92 and SOIC-8 plastic packages.

The LM134/LM234/LM334 are 3-terminal adjustable current sources featuring 10,000:1 range in operating current, excellent current regulation and a wide dynamic voltage range of 1V to 40V. Current is established with one external resistor and no other parts are required. Initial current accuracy is ±3%. The LM134/LM234/LM334 are true floating current sources with no separate power supply connections. In addition, reverse applied voltages of up to 20V will draw only a few dozen microamperes of current, allowing the devices to act as both a rectifier and current source in AC applications.

The sense voltage used to establish operating current in the LM134 is 64mV at 25°C and is directly proportional to absolute temperature (°K). The simplest one external resistor connection, then, generates a current with ≈+0.33%/°C temperature dependence. Zero drift operation can be obtained by adding one extra resistor and a diode.

Applications for the current sources include bias networks, surge protection, low power reference, ramp generation, LED driver, and temperature sensing. The LM234-3 and LM234-6 are specified as true temperature sensors with ensured initial accuracy of ±3°C and ±6°C, respectively. These devices are ideal in remote sense applications because series resistance in long wire runs does not affect accuracy. In addition, only 2 wires are required.

The LM134 is specified over a temperature range of −55°C to +125°C, the LM234 from −25°C to +100°C and the LM334 from 0°C to +70°C. These devices are available in TO hermetic, TO-92 and SOIC-8 plastic packages.

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類型 標題 日期
* Data sheet LM134/LM234/LM334 3-Terminal Adjustable Current Sources datasheet (Rev. E) 2013年 6月 20日
E-book Tips and tricks for designing with voltage references (Rev. A) 2021年 5月 7日
Application note Precision Current Sources and Sinks Using Voltage References 2020年 6月 30日
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 2019年 6月 28日
Application note AN-256 Circuitry for Inexpensive Relative Humidity Measurement (Rev. B) 2013年 5月 6日
Application note AN-240 Wide-Range Current-to-Frequency Converters (Rev. B) 2013年 4月 29日
Application note AN-C V/F Converter ICs Handle Frequency-to-Voltage Needs (Rev. B) 2013年 4月 23日
More literature Die D/S LM334 MWC 3-Terminal Adj Current Source 2012年 9月 21日
Application note TO-92 Packing Options / Ordering Instructions (Rev. A) 2010年 6月 23日
Application note Applying a New Precision Op Amp 2004年 10月 4日

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This external resistor quick-start calculator tool lets you easily calculate valid external resistor values relative to voltage reference, supply and load-current bounds. With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand (...)

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LM336-2.5-MIL 分流電壓參考
分流電壓參考
ATL431 2.5-V 低 IQ 可調整精密分流穩壓器 LM136-2.5-N 電壓參考二極體 LM136-5.0 5.0 V 參考二極體 LM136-5.0QML 5.0 V 參考二極體 LM136A-2.5QML 2.5V 參考二極體 LM136A-2.5QML-SP 抗輻射 QMLV、2.5-V 分流電壓參考 LM136A-5.0QML 5.0 V 參考二極體 LM185-1.2-N 微功耗電壓參考二極體 LM185-1.2QML 微功耗電壓參考二極體 LM185-1.2QML-SP 抗輻射 QMLV、1.2-V 分流電壓參考 LM185-2.5-N 微功耗電壓參考二極體 LM185-2.5QML 微功耗電壓參考二極體 LM185-2.5QML-SP 航太級 QMLV 2.5-V 分流電壓參考 LM185-ADJ 可調整微電源電壓參考 LM185QML 可調整微電源電壓參考 LM285-1.2 1.235-V、–40°C 至 +85°C、微功率電壓參考 LM285-1.2-N 1.235-V、–40°C 至 +85°C 微功耗電壓參考二極體 LM285-2.5 2.5-V、–40°C 至 +85°C、微功率電壓參考 LM285-2.5-N 2.5-V、–40°C 至 +85°C 微功耗電壓參考二極體 LM285-ADJ 可調式 85°C 微功耗電壓參考 LM336-2.5 0°C 至 70°C、2.5-V 整合式參考電路 LM336-2.5-N 電壓參考二極體 LM336-5.0 5-V 參考二極體 LM385-1.2 1.235-V、2%、0°C 至 70°C 微功率電壓參考 LM385-1.2-MIL 微功耗電壓參考 LM385-1.2-N 1.235-V、0°C 至 70°C 微功耗電壓參考二極體 LM385-2.5 2.5-V、2%、70°C、微功率電壓參考 LM385-2.5-N 2.5-V、0°C 至 70°C 微功耗電壓參考二極體 LM385-ADJ 可調式 70°C 微功耗電壓參考 LM4030 超高精確分流電壓參考 LM4040 固定電壓、45-µA 精密微功率分流電壓參考 LM4040-N 100-ppm/°C 精密微功率分流電壓參考 LM4040-N-Q1 車用 100-ppm/°C 精密微功率分流電壓參考 LM4041-N 固定式與可調式 45-µA 精密微功率分流電壓參考 LM4041-N-Q1 車用精密微功率分流電壓參考 LM4050-N 50-ppm/°C 精密微功率分流電壓參考 LM4050-N-Q1 車用 50-ppm/°C 精密微功率分流電壓參考 LM4050QML-SP 抗輻射 QMLV、2.5-V 或 5-V 分流電壓參考 LM4051-N 固定式與可調式精密微功率分流電壓參考 LM431 2%、1% 或 0.5% 準確度,可調整精密齊納分流穩壓器 LM4431 微功耗分流電壓參考 LMV431 1.5% 低電壓 (1.24-V) 可調式精密分流穩壓器 LMV431A 1% 低電壓 (1.24-V) 可調式精密分流穩壓器 LMV431B 0.5% 低電壓 (1.24-V) 可調節式精密分流穩壓器
電流參考
LM134 3 端子可調節電流源 LM234 100°C 3 接腳可調整電流源 LM334 0°C 至 70°C 3 接腳可調整電流源
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