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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.
| Documentación principal | Tipo | Título | Opciones de formato | Descargar la versión más reciente en inglés | Fecha |
|---|---|---|---|---|---|
| * | Hoja de datos | LM134/LM234/LM334 3-Terminal Adjustable Current Sources datasheet (Rev. E) | 20/06/2013 | ||
| Nota sobre la aplicación | Precision Current Sources and Sinks Using Voltage References (Rev. A) | PDF | HTML | 15/04/2026 | ||
| Libro electrónico | Tips and tricks for designing with voltage references (Rev. A) | 7/05/2021 | |||
| Libro electrónico | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 28/06/2019 | |||
| Nota sobre la aplicación | AN-256 Circuitry for Inexpensive Relative Humidity Measurement (Rev. B) | 6/05/2013 | |||
| Nota sobre la aplicación | AN-240 Wide-Range Current-to-Frequency Converters (Rev. B) | 29/04/2013 | |||
| Nota sobre la aplicación | AN-C V/F Converter ICs Handle Frequency-to-Voltage Needs (Rev. B) | 23/04/2013 | |||
| Nota sobre la aplicación | TO-92 Packing Options / Ordering Instructions (Rev. A) | 23/06/2010 | |||
| Nota sobre la aplicación | Applying a New Precision Op Amp | 4/10/2004 |
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
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| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| SOIC (D) | 8 | Ultra Librarian |
| WAFERSALE (YS) | — | Ultra Librarian |
| TO-92 (LP) | 3 | Ultra Librarian |
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