• Updated preview temperature drift from 0.5 ppm/°C to 0.8 ppm/°C for the ceramic package for the 2.5V,

4.096V, and 5V variants. ................................................................................................................................. 13

• Updated 5V variant noise reduction capacitor = 100µF value from 0.08 ppm p-p to 0.11 ppm p-p................. 13

• Added wideband noise specification with NR cap 1uF for 3V, 4.5V and 5V variants....................................... 13

• Added 9000 hours data to the long-term stability graph for FKH package and added temperature drift

distribution for REF54xxxFKHT. Renamed plots to distinguish between REF54xxxFKHT and REF54xxxCDR.

Figure 6-18 and Figure 6-20 ............................................................................................................................15

• Added the 9000 hours long term stability data for FKH package to Figure 7-4 ...............................................19

• Added layout example for FKH package.......................................................................................................... 30

Changes from Revision B (June 2024) to Revision C (May 2025)

Page

• Added REF54xxxCFKH information throuout the data sheet............................................................................. 1

• Changed REF54500CDR device variant status from preview to production data. Added LCCC package

variants in preview state..................................................................................................................................... 3

• Move REF54500CDR specifications from preview to released........................................................................13

• Added the 7500 hours long term stability data for SOIC package to Figure 7-3 ............................................. 19

• Added the 2000 hours long term stability data for FKH package to Figure 7-4 ...............................................19

12 Mechanical, Packaging, and Orderable Information

The following pages include mechanical packaging and orderable information. This information is the most

current data available for the designated devices. This data is subject to change without notice and revision of

this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

www.ti.com

REF54

SNVSCN7D – NOVEMBER 2023 – REVISED JUNE 2026

Copyright © 2026 Texas Instruments Incorporated

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Product Folder Links: REF54