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Product Detailed Parameters
- Description：LM185-2.5-N MICROPOWER VOLTAGE R
- Series：-
- Mfr：National Semiconductor
- Package：Bulk
- Output Type：Fixed
- Voltage - Output (Min/Fixed)：2.5V
- Voltage - Output (Max)：-
- Current - Output：20 mA
- Operating Temperature：-55°C ~ 125°C (TA)
- Mounting Type：Through Hole
- Package / Case：TO-46-2 Metal Can
- Supplier Device Package：TO-46-2, Metal Can
- Grade：-
- Qualification：-
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Overview
The LM185H-2.5/NOPB is a micropower shunt voltage reference manufactured by Texas Instruments, originally part of the National Semiconductor portfolio. It provides a fixed output voltage of 2.5 V with an initial accuracy of ±1.5%. The device operates within a temperature range of -55°C to +125°C and features a temperature coefficient of ±30 ppm/°C. It supports a maximum shunt current of 20 mA and is housed in a TO-46-2 through-hole package.
Feature Summary
- Provides a stable 2.5 V reference voltage suitable for precision applications
- Operates reliably across extended industrial temperature ranges
- Designed for low power consumption in micropower circuits
Applications
- Precision analog-to-digital converter references
- Battery-powered instrumentation systems
- Portable measurement equipment requiring stable voltage sources
Procurement Notes
Verify that the component matches the specific LM185H-2.5/NOPB designation, as the LM185 family includes adjustable variants and other fixed voltages. Confirm the manufacturer origin, noting that Texas Instruments now produces this part following the acquisition of National Semiconductor. Ensure the TO-46-2 package type aligns with your board layout requirements before procurement.
Selection Notes
Select this component when a fixed 2.5 V reference is required rather than an adjustable one. Consider the ±30 ppm/°C temperature coefficient for thermal stability needs. The TO-46-2 package dictates through-hole mounting, which may influence PCB design compared to surface-mount alternatives like the LM185MX series.
Part Context
This part belongs to the LM185/LM285/LM385 family of adjustable micropower voltage references. While the base LM185 is adjustable, the LM185H-2.5 variant offers a fixed 2.5 V output. The 'H' suffix typically denotes the metal can package style, and 'NOPB' indicates lead-free construction compliant with RoHS standards.
Replacement Considerations
LM185H-2.5 is functionally equivalent to LM285H-2.5 and LM385H-2.5 within the same family. Surface-mount equivalents include LM185MX-2.5 or LM285MX-2.5 if package adaptation is acceptable.
