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Technical Specifications
Parameters and characteristics for this part
| Specification | LM134 MDC |
|---|---|
| Accuracy | 3 % |
| Current - Output | Adjustable |
| Function | Current Source |
| Mounting Type | Surface Mount |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -55 °C |
| Package / Case | Die |
| Supplier Device Package | Diesale |
| Voltage - Input [Max] | 40 V |
| Voltage - Input [Min] | 1 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tube | 400 | $ 6.94 | |
| Texas Instruments | NOT REQUIRED | 1 | $ 8.55 | |
| 100 | $ 6.97 | |||
| 250 | $ 5.48 | |||
| 1000 | $ 4.65 | |||
Description
General part information
LM134 Series
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.
Documents
Technical documentation and resources
