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Alternatives to STMicroelectronics L3845D1013TR

STMicroelectronics L3845D1013TR and its qualified second sources, compared on form, fit and function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

Equivalent and substitute parts for STMicroelectronics L3845D1013TR

L3845D1013TR compared against its qualified second sources
L3845D1013TRSTMicroelectronicsSI3019-F-FTSkyworks Solutions Inc.SI3019-F-FSSkyworks Solutions Inc.+1more
FFF CompatibilityHoused in a 16-pin TSSOP package vs the original 8-pin SOIC, which is physical-pinout incompatible.Different physical package outline (TSSOP vs SOIC) and pin count.Meets or exceeds all line interface, AC impedance, and DC loop termination standards when integrated into a modern DAA design.The package is a 16-pin SOIC (1.27mm pitch) whereas the target is an 8-pin SOIC, requiring a layout redesign.Physically larger body (16 pins vs 8 pins) but utilizes standard surface-mount style.Fully capable of executing identical analog DC loop termination, AC impedance control, and hook detection, but must be paired with a system-side controller (e.g. Si3050).
AI Summary

L3845D1013TR by STMicroelectronics: Monitoring, Digital Current Interface 8-SOIC.

The SI3019-F-FT is the TSSOP-16 sibling of the SI3019-F-FS. It provides identical global direct access arrangement functions in an even smaller form factor, making it ideal for space-constrained analog trunk termination redesigns.

  • Active status with excellent long-term manufacturer support
  • Very compact 16-TSSOP footprint reduces overall board space compared to SOIC-16
  • Performs full-featured global DAA functions, AC/DC termination, and ring detection
  • TSSOP pitch is tighter (0.65mm vs 1.27mm), which may require assembly adjustments
  • Requires a system-side chip (e.g. Si3050) to configure register-level telecom operations

The SI3019-F-FS is an active, modern silicon DAA line-side chip designed to provide programmable DC loop termination, AC impedance matching, and ring detection. While it requires a system-side processor interface (via SPI, PCM, or GCI) and a footprint redesign, it represents the most robust, long-term active alternative for legacy PSTN trunk interface functions.

  • Active lifecycle status ensures long-term availability
  • Performs DC line termination and AC impedance matching conforming to global standards
  • Supports on-hook line monitoring and integrated ring detection (via external system-side IC)
  • Requires 16-pin footprint vs the original 8-pin package
  • Needs a digital interface controller (like Si3050) to manage commands, whereas the target was a standalone analog circuit
Lifecycle StatusObsoleteActiveActive
Market AvailabilityDiscontinuedIn stockIn stock
REACHREACHREACHUnknown
RoHSRoHSRoHSRoHS
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