Cherry Blossom vs OrCAD X: the best OrCAD alternative

OrCAD X from Cadence is a family of tools. OrCAD X Capture handles schematics and ships with built-in PSpice for analog and mixed-signal simulation. Cadence lists DC, AC and transient analyses, plus Monte Carlo, Smoke and worst-case analyses for component variation. Capture also includes Live BOM, which shows lifecycle status, lead time, price and inventory while you choose parts.

Layout happens in OrCAD X Presto, with cross-probing to the schematic, a 3D canvas with 3D DRC, and in-design signal and power integrity analysis powered by Sigrity X Aurora. Cadence's cloud features add design sync, version control, shared libraries and live layout collaboration for two designers at once.

Cherry Blossom takes the schematic-to-fab-files path and does the work for you. You describe the board; an agent writes it as tscircuit code in a cloud sandbox and builds it, and you see the schematic, PCB layout, 3D view and BOM. Footprints come from real part data and every AI edit goes through a verification gate. There is no simulation and no SI or PI analysis.

Cadence sells OrCAD X in Standard and Professional versions, on a yearly single-user licence through its online store. A 30-day free trial needs no payment details and includes the full Professional Plus feature set, and students can get a longer academic trial once verified. We could not load the store's price list, so we have not quoted a figure; check Cadence for the current one.

Pro is $20 a month with 4M AI credits and 600 AI actions a day. Ultra is $140 a month with 32M credits and the frontier models. Usage past the allowance is $5 per 1M credits, only if you turn it on. The AI is included, with no API key and no per-seat licence. See the pricing page for details.

• Your boards are microcontroller boards, sensors, breakouts or prototypes, and a professional seat is more than you need.

• You want a whole board built from a description, in the browser, in one sitting.

• You want the design checked against manufacturing rules and ready to order through a PCBWay hand-off.

• You want to finish by hand later, in KiCad, from an exported project.

It fits hardware engineers who need a prototype board quickly and startups that do not want to buy yearly seats yet.

OrCAD's pitch is schematic capture with PSpice behind it, so we looked at how far a board gets with neither. On our own machine, an AI agent built a 4-port USB 2.0 hub in tscircuit, the open-source engine Cherry Blossom runs on, with the same tscircuit version and review tool Cherry Blossom's agent uses. The schematic follows the hub chip's datasheet. The 12 MHz crystal has no load capacitors because the chip has them built in, a 2.7 k 1 % resistor sets its reference, and a 10 k / 47 k divider brings the 5 V bus down to 4.1 V for its sense pin.

The first build passed every check: 0 DRC errors, 0 netlist errors or warnings, 0 review problems. Then an outside review of the circuit looked at what those checks skip, starting with how the power behaves:

• The hub runs only on power from the upstream port, yet put 60.6 uF on that supply. USB 2.0 limits a bus-powered device to the inrush of 10 uF.

• Nothing switched power to the downstream ports, which USB 2.0 requires of a bus-powered hub.

• Each downstream port had 10 uF of bulk capacitance, where USB 2.0 asks a hub port for 120 uF.

• The over-current pin was tied high, so the host would never hear about a fault.

• The crystal's datasheet allows up to 80 ohm ESR (its internal loss), and the hub chip needs 50 ohm or less.

Catching those takes an engineer reading the USB spec and the datasheets, or a transient run of the power path in PSpice or KiCad's SPICE simulator. The fix was a TPS2041B power switch in place of the resettable fuses, turned on by the hub chip and reporting faults back to it. Smaller input capacitors cut the upstream load to 7.2 uF, a 220 uF capacitor brought the ports' shared rail to 260 uF, and a crystal rated at 50 ohm ESR replaced the old one. The circuit's score rose from 66 to 89 out of 100. The layout, redone for the new parts, scored 80, below our 85 bar, and the board has not been built.