Exact device and ordering identity
UCD3138064RMHR identifies the 40-contact RMH WQFN ordering option of TI’s non-A digital power-supply controller, supplied in the original manufacturer ordering table as a 2,000-unit large tape reel. The controller is intended for programmable feedback and isolated-power control rather than directly supplying an amperage-rated output rail. Its smaller terminal count differentiates it from UCD3138064RGCR, even though both use the same UCD3138064 family firmware architecture.
Operating and control considerations
This device includes two 32 kB program flash banks, giving 64 kB total space for a firmware image strategy. The core provides up to three feedback loops, eight DPWM outputs and 250 ps pulse-width timing resolution. A 2 MHz upper switching rate is a capability limit, not a mandatory operating frequency. When applying these resources, separate timing granularity from analog measurement precision and verify which control signals and communications ports are accessible on this exact 40-pin package.
Package, sourcing and engineering trade-offs
The RMH WQFN land pattern is a primary engineering purchasing check; a family-level UCD3138064 match does not establish drop-in pin compatibility with the 64-pin RGC body. Firmware flashing, gate-driver interfacing and fault protection deserve joint review with the PCB layout, rather than relying on a shared 64 kB flash specification. Use the entire RMHR suffix on the BOM and quote, and confirm feeder format independently from any other suffix.
Manufacturer-verified selection specifications
| Selection parameter | TI-verified value | Engineering condition |
|---|---|---|
| Flash | 64 kB program flash derivative of UCD3138 family | Confirm firmware image layout |
| Banks | 2-32 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 | 14-channel, 12-bit, 267-ksps general purpose ADC | ADC sampling specification |
| Catalog package | WQFN-40-EP(6×6) | Match exact TI mechanical drawing before footprint or replacement approval |
For a non-A UCD3138064 controller in a 64-contact RGC package, compare UCD3138064RGCR with this RMH WQFN-40 option. The UCD3138064RJAR is another non-A 40-pin ordering option, but uses the RJA VQFN land pattern rather than RMH WQFN. Verify the exact terminal mapping, assembly land pattern and firmware resource configuration before selecting a different orderable.
Procurement and datasheet
Request a quotation for UCD3138064RMHR 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.
