12-bit SAR ADC in a through-hole DIP — what it is and where it fits
The Maxim MAX187BCPA+ is a 12-bit successive-approximation-register (SAR) analog-to-digital converter with a single-ended input, internal reference, and SPI serial interface, housed in an 8-pin PDIP package. It samples at 75 ksps, which is enough for slow-to-moderate-rate signals like temperature, pressure, or battery voltage monitoring in bench instruments, data loggers, and embedded controllers. The 0°C to 70°C commercial temperature range keeps it in indoor, conditioned environments — not for an engine bay or a rooftop enclosure.
Single-ended input and internal reference — BOM simplification
The single-ended input (one channel, referenced to analog ground) and internal reference eliminate the need for an external reference IC and differential driver. The 5 V analog and digital supply rails are shared, so a single 5 V rail powers the whole converter. The 1:1 S/H-to-ADC ratio means the sample-and-hold acquires the input on every conversion cycle — no pipeline delay to budget.
Through-hole PDIP — prototyping and legacy sockets
The 8-pin PDIP (0.300" width, 7.62 mm pitch) is a breadboard-friendly package. It fits standard DIP sockets and is easy to hand-solder. Not for high-density SMT production, but ideal for low-volume instrumentation, retrofits, or lab boards where a DIP is preferred for serviceability.
Lifecycle and compliance
Listed as Active with ROHS3 compliance. No end-of-life notice on record.