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.

• 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

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• Iout/Iz (Max) (mA)
• 0.01
• Vin (Min) (V)
• 0.8
• Vin (Max) (V)
• 40
• Initial accuracy (Max) (%)
• 3

LM234的完整型号有：LM234Z-3/NOPB、LM234Z-6/NOPB，以下是这些产品的关键参数及官网采购报价：

LM234Z-3/NOPB，工作温度：-25 to 100，封装：TO-92 (LP)-3，包装数量MPQ：1800个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：Call TI，TI官网LM234Z-3/NOPB的批量USD价格：1.355（1000+）

LM234Z-6/NOPB，工作温度：-25 to 100，封装：TO-92 (LP)-3，包装数量MPQ：1800个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：Call TI，TI官网LM234Z-6/NOPB的批量USD价格：.589（1000+）

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