Alternatives to STMicroelectronics L3845D1013TR
STMicroelectronics L3845D1013TR and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 L3845D1013TRSTMicroelectronics | Discrete Redesign (Bridge + TL431 + Optocoupler)Multi-Source / Generic | CPC5621A / CPC5622ALittelfuse / IXYS Integrated Circuits Division | |
|---|---|---|---|
| FFF Compatibility | The discrete solution distributes the integrated functions of the L3845 across multiple separate components, requiring a complete layout redesign.A collection of discrete components occupies a significantly larger board footprint than a single 8-SOIC package.Can be designed to perfectly match the zener-like DC line termination, polarity guard, and optocoupler-based hook detection of the L3845. | The CPC5621A uses a 32-SOIC package with a completely different pinout and requires an external low-voltage supply (3V to 5.5V).The 32-SOIC (0.295" width) footprint is much larger than the compact 8-SOIC footprint of the L3845.Excellent functional equivalent that manages DC line termination and hook detection within a single active IC. | |
 AI Summary | L3845D1013TR by STMicroelectronics: Monitoring, Digital Current Interface 8-SOIC. | Since integrated analog trunk loop termination ICs in 8-pin SOIC packages are virtually obsolete, a discrete emulation circuit is the most reliable long-term design path. A standard diode bridge provides the polarity guard, an adjustable shunt regulator like the TL431 or a Zener diode governs the DC loop termination, and an optocoupler delivers the off-hook status detection. This eliminates dependency on specialized telecom silicon while achieving full functional equivalence.
| The CPC5621A / CPC5622A (LITELINK III) is a modern, active integrated silicon phone line interface IC that replaces the integrated functions of obsolete PSTN trunk interfaces. It handles DC termination, polarity guard, and off-hook detection inside a single chip. Implementing this option will require a complete redesign of the analog interface portion of the PCB to accommodate its larger 32-SOIC package and external supply voltage.
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| Lifecycle Status | Obsolete | Unknown | Unknown |
| Market Availability | Discontinued | Unknown | Unknown |
| REACH | REACH | Unknown | Unknown |
| RoHS | RoHS | Unknown | Unknown |
| Description | Monitoring, Digital Current Interface 8-SOIC | Since integrated analog trunk loop termination ICs in 8-pin SOIC packages are virtually obsolete, a discrete emulation circuit is the most r | The CPC5621A / CPC5622A (LITELINK III) is a modern, active integrated silicon phone line interface IC that replaces the integrated functions |
| Manufacturer | STMicroelectronics | Multi-Source / Generic | Littelfuse / IXYS Integrated Circuits Division |
| Type | Interface | Component | Component |
| Datasheet | Open | N/A | N/A |
| Lead Time | Unknown | Unknown | Unknown |
| Country of Origin | - | - | - |
| Export Control Class Number | EAR99 | EAR99 | EAR99 |
| HTSUS Code | 8542.39.0090 | - | - |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - |
| Applications | Monitoring, Digital Current | - | - |
| Mounting Type | Surface Mount | - | - |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | - | - |
| Supplier Device Package | 8-SOIC | - | - |
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Frequently asked questions
Yes. The STMicroelectronics L3845D1013TR is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the STMicroelectronics L3845D1013TR are the Discrete Redesign (Bridge + TL431 + Optocoupler) (Multi-Source / Generic) and the CPC5621A / CPC5622A (Littelfuse / IXYS Integrated Circuits Division). Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the L3845D1013TR are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The L3845D1013TR (STMicroelectronics) is a part in the Interface category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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