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Product Detailed Parameters
- Description：IC VREF SHUNT 6.9V TO92-3
- Series：-
- Mfr：Texas Instruments
- Package：Bulk
- Output Type：Fixed
- Voltage - Output (Min/Fixed)：6.9V
- Current - Output：15 mA
- Operating Temperature：0°C ~ 70°C (TA)
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA)
- Supplier Device Package：TO-92-3
- Grade：-
- Qualification：-
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Overview
The LM329CZ is a precision multi-current temperature-compensated 6.9V zener reference in a TO-92 epoxy package. It operates within a current range of 0.6 mA to 15 mA with a dynamic impedance of 0.8 Ω at 1 mA. The device features a nominal reverse breakdown voltage of 6.9 V, with a maximum of 7.25 V and minimum of 6.6 V. Its temperature coefficient is specified between 30 ppm/°C and 50 ppm/°C at 1 mA. RMS noise is typically 7 µV from 10 Hz to 10 kHz. Operating temperature ranges from 0°C to +70°C.
Feature Summary
- Utilizes a subsurface breakdown zener for improved long-term stability and lower noise compared to conventional IC zeners.
- Incorporates active circuitry to buffer the internal zener, enabling stable operation across a wide operating current range.
- Temperature compensating transistor is manufactured via a planar process, providing immunity to stress on leads and minimal voltage shift during temperature cycling.
Applications
- Simple reference circuits
- Low cost 0–25V regulators
- Adjustable bipolar output references
- Positive current sources
Procurement Notes
Verify that the component matches the specific LM329CZ designation, as the family includes variants like LM329BZ and LM329DZ with different temperature coefficients. Confirm the package type is the plastic TO-92 epoxy version rather than the hermetic metal can variant. Ensure the application environment stays within the 0°C to +70°C operational limits defined for this specific grade.
Selection Notes
Select the LM329CZ when a 6.9V reference with moderate temperature stability (30-50 ppm/°C) is required. It serves as a direct replacement for discrete zener diodes where low dynamic impedance simplifies biasing. Consider the LM329BZ if tighter temperature coefficients are needed, or the LM129 family for extended industrial temperature ranges.
Part Context
The LM329CZ belongs to the LM129/LM329 family of precision references originally developed by National Semiconductor. These devices are designed to replace standard zener diodes with superior performance characteristics. The LM329 specifically targets commercial applications with a limited temperature range, while the LM129 supports military and industrial environments.
Replacement Considerations
LM329BZ
FAQ
What is the dynamic impedance of the LM329CZ?
The typical reverse dynamic impedance is 0.8 Ω at an operating current of 1 mA.
How does the LM329CZ differ from the LM129?
The LM329CZ is rated for a commercial operating temperature range of 0°C to +70°C, whereas the LM129 supports an extended range of -55°C to +125°C.
