Exact device and ordering identity
UCD3138128APFCR is TI’s 80-terminal PFC TQFP tape-and-reel orderable in the UCD3138128A digital power controller family. The original manufacturer table specifies a 1,000-unit large reel. Its A-family identity and 128 kB flash differentiate it from 32 kB and 64 kB UCD3138 variants. It is a programmable controller for external power stages, not a power module with integrated magnetics or an output-current rating supplied by the IC itself.
Alternative Parts — Engineering Review
Source-listed candidate MPNs:
- UCD3138128APFC
These LCSC-listed manufacturer part numbers are engineering evaluation candidates, not confirmed drop-in replacements. Before substitution verify electrical limits, footprint, pinout, qualification and operating conditions.
Operating and control considerations
The 128 kB program space uses four 32 kB banks to support application firmware and update strategies. At the control-loop level, the device offers up to three independent feedback loops and eight high-resolution DPWM outputs, with 250 ps pulse-width resolution. The manufacturer’s 15-channel, 12-bit general-purpose ADC description cites 539 ksps, distinct from the dedicated control-loop error converter. Firmware schedules, measurement paths and switching decisions need separate verification before using those numbers in an application specification.
Package, sourcing and engineering trade-offs
The 80-pin TQFP package allows a different pin allocation and assembly footprint from 40- and 64-pin UCD controllers. A purchaser comparing UCD3138128APFCR with other UCD3138-family codes should examine the full orderable number, pin map, external clock and communications requirements, and approved firmware image. The 1,000-unit manufacturer reel is a procurement detail and should not be confused with memory-bank count or output power. The exact TI PFC drawing controls land-pattern selection.
Manufacturer-verified selection specifications
| Selection parameter | TI-verified value | Engineering condition |
|---|---|---|
| Flash | 128 kB Program Flash Derivative | Confirm firmware image layout |
| Banks | 4-32 kB Program Flash Memory Banks | Firmware bank arrangement |
| Loops | Digital Control of up to 3 Independent Feedback Loops | Control-loop configuration |
| 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 limit | Up to 2 MHz Switching Frequency | Maximum control frequency |
| Adc | 15 channel, 12 bit, 539 ksps General Purpose ADC | ADC sampling specification |
| Catalog package | TQFP-80(12×12) | Match exact TI mechanical drawing before footprint or replacement approval |
For a related A-family digital-power controller with 64 kB of program flash in a 64-pin RGC package, compare UCD3138064ARGCR. This UCD3138128APFCR instead has 128 kB split into four 32 kB banks and uses an 80-pin PFC TQFP footprint. Firmware image size, available pins, peripheral use and PCB layout—not a supposed output-current rating—should determine the choice.
Procurement and datasheet
Request a quotation for UCD3138128APFCR 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.
