Package and board-fit for the 30-SSOP
The TPS2226ADB ships in a 30-SSOP (0.209", 5.30mm Width) surface-mount package, supplied in tube format. The 0.65 mm pin pitch demands a controlled solder-paste stencil aperture to avoid bridging between adjacent switch outputs. The supplier device package is 30-SSOP, matching the package/case footprint. This is a standard SSOP body width, so existing 30-pin SSOP land patterns on the board should accept the part without a layout change.
What the 95 mOhm Rds(on) means for your thermal budget
With a typical on-resistance of 95 mOhm per channel, the conduction loss at 1 A output is under 100 mW per switch. The 95 mOhm figure is a typical value at 25°C; expect it to increase with junction temperature per the normalised Rds(on) curve in the datasheet. For a 1 A continuous load in a 70°C ambient, derate the output current or add thermal vias under the package.
Multi-rail switching for PCMCIA and CardBus slots
The TPS2226ADB switches three voltage rails — 3.3V, 5V, and 12V — across four outputs in a 3:4 input-to-output ratio. This maps directly to the VCC, VPP, and VCC_12V rails required by PCMCIA and CardBus slots, with the fourth output available for an auxiliary or second slot. The serial interface controls output selection and reports status via the Status Flag feature. The flag asserts when the part enters current limit or overtemperature shutdown, giving the host controller a real-time fault signal without polling the serial bus.
Fault protection and industrial temperature range
Built-in current limiting (fixed threshold) and overtemperature shutdown protect the switch and downstream card against short circuits and thermal runaway. The fixed current limit is set internally — no external resistor needed — and the thermal shutdown cycle prevents damage during sustained overloads. The high-side output configuration means the load is disconnected from the supply when the switch is off, eliminating leakage through the card slot.
Lifecycle and compliance for BOM planning
This means the part is available for new designs and ongoing production without an imminent last-time-buy window. RoHS3 compliant, the part meets the EU 2015/863 directive.