Exact device and ordering identity
UCD3138128PFCR is an 80-terminal, PFC-package ordering code within TI’s UCD3138128 digital power controller family. It provides programmable digital-control resources for external isolated-power circuits rather than a ready-made regulated output or integrated switch stage. The orderable PFCR suffix matters for assembly procurement, while the UCD3138128 versus UCD3138A64 distinction matters when firmware image size and peripheral allocation are specified.
Alternative Parts — Engineering Review
Source-listed candidate part numbers:
- UCD3138128PFC
These source-listed candidates are for engineering evaluation only, not confirmed drop-in replacements. Verify voltages, current limits, pinout, footprint, qualification and relevant operating conditions before substitution.
Operating and control considerations
The TI family integrates high-resolution DPWM generators, up to three hardware-supported feedback loops and an error ADC. The 64 kB/128 kB memory options and bank arrangement must be tied to the exact derivative and firmware build rather than promised as extra usable memory on every order code. DPWM pulse-width granularity describes digital command timing, not ADC resolution, guaranteed output ripple or completed supply-system performance.
Package, sourcing and engineering trade-offs
For a new or replacement design, compare the original 80-terminal PFC land pattern, controller firmware dependencies, available memory bank map, communication ports and configured control-loop topology. A UCD3138-family part in a different package or with an A64/128 naming change can require new pin assignments or firmware qualification. Specify the entire PFCR orderable code in RFQs and separately verify firmware revision, quantity format and package drawing.
Manufacturer-verified selection specifications
| Selection parameter | TI-verified value | Engineering condition |
|---|---|---|
| Family memory | 128 kB program flash in the UCD3138128 device | Refer to exact manufacturer operating conditions |
| Flash banks | Four 32 kB program-flash banks (128 kB total) | Refer to exact manufacturer operating conditions |
| Control loops | Digital Control of up to 3 Independent Feedback Loops | Refer to exact manufacturer operating conditions |
| Eadc | Up to 16 MSPS Error A/D Converter | Refer to exact manufacturer operating conditions |
| Dpwm | Up to 8 High Resolution Digital Pulse Width Modulated | Output-pin and firmware mapping |
| Pwm resolution | 250 ps Pulse Width Resolution | Timing granularity, not ADC precision |
| Frequency resolution | 4 ns Frequency and Phase Resolution | Refer to exact manufacturer operating conditions |
| Catalog package | TQFP-80(12×12) | Match exact TI mechanical drawing before footprint or replacement approval |
For another 128 kB digital-power controller orderable in the 80-pin PFC TQFP family, compare UCD3138128APFCR with this non-A UCD3138128PFCR. Both are programmable controllers for external power stages, not complete output-current-rated converters. Review the A-version firmware image, boot ROM and peripheral mappings before substitution even where the package family is shared.
Procurement and datasheet
Request a quotation for UCD3138128PFCR using the complete orderable number, target quantity and package requirement. Stock, pricing and delivery timing require a direct RFQ confirmation; no on-page availability or price is promised. Source-listed alternative candidates, where present, are for engineering evaluation and do not establish drop-in compatibility.
