FTDI’s USB to UART bridges are running dry, and the tiny FT234XD-R has no relative to fall back on. Here is how to read the shortage, and which of three alternates, from Microchip, WCH or Silicon Labs, belongs on your next board.
Built from Supplyframe commodity and lead-time data and live Findchips distributor coverage captured May 31, 2026.
There is a particular kind of dread that comes from a $2 part. The expensive silicon on a board, the SoC, the power stage, the radio, gets watched like a hawk. It is the cheap, boring glue that quietly takes a program down. In 2026 the glue in question is the USB to UART bridge, and the name on most of those bridges is FTDI.
Across the popular FTDI parts the authorized channel has gone to zero, and the cruelest case is the FT234XD-R, FTDI’s smallest bridge. It is a 3-millimeter DFN that space-constrained wearables, dongles and modules reached for precisely because nothing else fit. The catch is that nothing else fits to replace it either. No other FTDI bridge shares its footprint, so the part that was chosen to save board space is now the part with no easy way out.
The situation is not hopeless. There is still a runway of authorized stock, and there are three credible alternates from other vendors. But every one of them means changing the board, and choosing the right one depends less on price than on what kind of program you are protecting. This is the field guide.
Why the Bridge Ran Dry
Supplyframe files USB to UART bridges under its Drivers and Interfaces commodity, and the April 2026 reading makes clear this is structural rather than a one-month blip. Inventory across the category is down almost 33% year-over-year and another 14% on the quarter, which means the channel buffer that normally absorbs a demand swing has been spent. Pricing is moving the other way, up almost 8% on the quarter with a forecast for several percent more, the textbook shape of a market with no slack left.
The twist is that the obvious escape route has its own traffic. The cleanest authorized alternate, Microchip’s MCP2200, comes from a vendor that is now asking for 26 weeks of visibility on its own MCU and MPU lines, with that lead-time index still climbing into the third quarter. Qualifying MCP2200 is the right move, but be clear about what it buys you. It removes a single-source exposure to FTDI. It does not remove you from the queue.
The Incumbent Still has a Runway
The FT234XD-R is FTDI’s 12-pin DFN at 3 millimeters square, a USB full-speed to basic UART bridge with charger detection.
It exposes the basic UART signals, the USB data lines, a VCC input on pin one and a 3V3OUT regulator output on pin five that needs its own decoupling capacitor. There is no full modem handshake set; that is the larger FT231X. It is, in other words, the minimalist of the family, and that minimalism is exactly why it has no sibling to fall back on.
Who actually has FT234XD-R in stock right now?
One distributor, mostly. Newark is holding real authorized depth, around 13,541 units near $3.37, while Mouser, RS and TME all read zero on the authorized side, RS quoting a 12-week lead. The independent channel covers another 14,000 to 20,800 units near $4.
The tell that the market is tight is the broker listing: 50 pieces at Neutron USA for $63 each, nearly 20 times the authorized price. When a $2 part shows up at $60, that is not a price, it is a flare. Place authorized cover at Newark while it lasts, and do not chase the flare. You can watch the distributor split move week to week.
Should You Respin Now or Ride it Out?
It depends on when the program ships. If it is in mass production today and Newark depth plus your on-hand inventory carries you to the next planned revision, ride it out and fold the change into that revision.
If the program ships in 2027 or later, respin now, because there is no DFN 12 fallback and the inventory trend points down. Either way, treat the Newark stock as a runway that funds the qualification work, not as a reason to assume the part stays available through next year.
Microchip MCP2200: The Authorized Safe Harbor
If your program cannot live in the broker market, Microchip’s MCP2200 is the part to qualify. It is a USB 2.0 to UART converter with a small EEPROM and eight configurable GPIO, and its strength in 2026 is simply that you can buy it: Findchips shows 14 authorized distributors live, by far the deepest authorized bench of any alternate here. The Newark line on the SSOP version runs about 868 units near $2.70.
Is MCP2200 a drop-in for the FT234XD-R?
No, and it is worth being blunt about that because the temptation is real. MCP2200 ships in 20-lead SSOP, SOIC or a 5-millimeter VQFN, all with their own pinout, against the FT234XD-R’s 3-millimeter DFN 12. It is a functional alternate, not a footprint or schematic swap. Treat the next board revision as the qualification vehicle rather than hoping for a paste over.
What Changes on the Board and in the Firmware?
Three things. The footprint grows, the 5-millimeter VQFN is larger than the FTDI QFN it might sit beside, so plan the area rather than assuming a swap. The USB software stack needs a look, because MCP2200 carries a Microchip Vendor ID, so any host code keyed to FTDI’s VID, descriptors, serial number format or COM port enumeration has to be revalidated across Windows, macOS and Linux. And throughput is lower, roughly 1 megabit per second against the FT231X family’s 3, which almost never matters for a basic UART design but should be checked before you specify.
The consolation prize is those eight GPIO, which can absorb an IO expander elsewhere on the BOM. Compare MCP2200 stock and lead time before you commit, and book against Microchip’s 26-week window rather than trusting catalog stock to be there later.
Best fit: industrial, medical and anything that needs authorized channel traceability and a long lifecycle. The board work is real, but the supply position is the strongest of the three.
WCH CH340: Cheap and Everywhere it’s Allowed to Be
The WCH CH340 family is the default low-cost bridge in consumer and hobbyist designs, especially across Asia Pacific, in variants from the CH340G in SOP 16 down to the tiny CH340N in SOP 8. The appeal is the price. The constraint is the channel.
How cheap is cheap?
About a tenth of FTDI’s authorized pricing. Findchips shows CH340G near 35 to 37 cents at the 1,000-piece break, with WCH itself holding roughly 11,000 units. That gap is the entire reason the part dominates consumer boards, and it is large enough to pay for a fair amount of redesign and driver work. Compare CH340G volume pricing and the math makes itself.
So Why Not Put it Everywhere?
Because there are zero authorized distributors behind it, which means no authorized channel traceability, and because the drivers ship from WCH and need a Windows signing review before they go into any industrial or medical deployment. For a consumer build those are manageable line items. For a regulated program they are the whole ball game.
The smaller CH340N is also thin in the channel right now, one authorized and one independent source with WCH itself at zero on request, so if you want the small-footprint version, lock the source before you design it in. Like every option here it is a board-level change, not a pin-compatible second source.
Silicon Labs CP2102N: The Authorized Hedge…With a Wait
Silicon Labs’ CP2102N-A02-GQFN20 is the QFN 20 functional alternate that restores the authorized traceability the CH340 cannot, and at 4 millimeters square it sits closer to a clean QFN 20 respin than the MCP2200’s larger VQFN. Findchips shows six authorized and seven independent sources, with one authorized distributor holding about 2,520 units.
Is CP2102N a Drop-in, and What is The Lead Time?
Not a drop-in; it has its own pinout and a Silicon Labs Vendor ID, so the layout and the USB stack both change. And the lead time is the real cost: authorized listings at DigiKey quote 31 weeks, even with stock on the shelf today.
That makes CP2102N a parallel qualification rather than an instant fix. If you must stay in the authorized channel and can plan around the wait, qualify it now and book against the 31-week window rather than waiting for it to shorten. Check CP2102N authorized stock and lead time.
What a Respin Actually Costs You
Because no FTDI bridge shares the DFN 12 footprint, accepting any alternate means a board change. The good news is that the change is bounded and predictable. Scope it around five deltas, whether you land on the FTDI FT231XQ-R, the Microchip MCP2200 or the Silicon Labs CP2102N.
- Footprint and area. The DFN 12 at 3 millimeters grows to a QFN 20 at 4 millimeters, or 5 millimeters for the MCP2200 VQFN. Budget the board area, the copper relief and thermal vias for the exposed pad.
- Power and decoupling. Review VCC, the 3V3OUT regulator output and its capacitor, and any IO voltage domain the target exposes. These power arrangements differ across FTDI, Silicon Labs and Microchip, so verify them at the schematic level rather than assuming the FT234XD-R layout carries over.
- Signal set. The FT234XD-R exposes basic UART plus configurable CBUS lines. A full handshake QFN 20 such as FT231XQ-R adds the modem control signals, which need to be tied off if unused. MCP2200 adds GPIO that may absorb existing IO.
- USB ESD. FT234XD-R designs usually pair an ST USBLC6-2SC6 array on the data lines. Keep it as a separate placement; the same protection carries to every QFN 20 target.
- USB software stack. Every non-FTDI target changes the Vendor ID and may change the descriptors, serial number format and enumeration behavior. Budget host and driver revalidation into the schedule, not just the layout.
Making the Call
Strip away the detail and the decision is about program type, not unit price. Regulated or industrial work wants MCP2200 first, with CP2102N as the authorized hedge if you can absorb its lead time. Consumer or hobbyist work wants the CH340 family and its tenfold cost saving. In every case the FT234XD-R depth still sitting at Newark is the runway that funds the qualification, so spend it deliberately.
| Part | Best for | Why | On Findchips |
| FT234XD-R | The incumbent | Smallest footprint, still has Newark authorized depth, no in-family fallback. Ride it out or plan a respin. | Check availability |
| MCP2200 | Regulated, industrial | Deepest authorized bench of the alternates. Functional swap that needs a new footprint and a USB stack pass. | Check stock |
| CP2102N | Authorized hedge | Closest to a clean QFN 20 respin and keeps authorized traceability. Plan around a 31-week lead. | Check sources |
| CH340G | Consumer, cost-down | Roughly a tenth of FTDI pricing. Independent channel only, driver-signing review required. | View availability |
| CH340N | Small footprint, cost-down | The compact SOP 8 option, but channel depth is thin right now, so secure the source first. | Compare sourcing |
The constraint is not going to ease before the fourth quarter. The teams that come through it cleanly are the ones that pick an alternate this week, run it through a real footprint and firmware pass, and book FT234XD-R cover while the queue is merely long rather than closed. The live coverage to start that work is one click away, and the three alternates are one search beyond it.
Sources and references
Sources and Verification
Commodity figures are from the Supplyframe Drivers and Interfaces commodity, April 2026 reading, inventory down 32.74% year-over-year and 14.18% on the quarter, price index up 7.64% on the quarter with a plus 5.61% forward forecast. Lead-time context, including Microchip’s 26-week visibility ask and the MCU and MPU lead-time index at 130.5, is from the Supplyframe Commodity IQ lead-time analysis. Part-level stock, pricing and lead time were captured live from Findchips on May 31, 2026, and will move.
MCP2200 packages and the FT234XD-R footprint and power pins were verified against the Microchip and FTDI datasheets; throughput and Vendor ID statements are framed as maximum supported baud rate and USB software stack revalidation to avoid overstating performance or oversimplifying host software impact.