ADC0809CCN vs ADC0808CCN/NOPB

The ADC0809CCN is an 8-bit successive-approximation A/D converter with an 8-channel multiplexer and an on-chip address latch and decoder, specified for a 100 µs conversion time (clock frequency up to 640 kHz). The ADC0808CCN/NOPB is the same 8-bit 8-channel successive-approximation ADC family member but is specified for a 100 µs conversion time at a 640 kHz clock and is offered in a lead-free (NOPB = no lead) package. Both are 28-pin DIP devices with the same pinout and functional block diagram; the primary differences are the manufacturer's ordering suffix (NOPB denotes lead-free/RoHS-compliant construction) and the associated qualification/ordering documentation.

Yes. Both devices are 28-pin DIP parts with the same pinout: analog inputs IN0–IN7, address inputs A, B, C, ALE, START, EOC, OE, CLK, VREF(+), VREF(−), and the 8-bit tri-state data outputs D0–D7. The pin functions and package footprint are identical, so they are pin-compatible in a 28-pin DIP socket or PCB land pattern.

Functionally and pin-wise, yes, provided the design's timing, clock, reference, and supply conditions are satisfied. Both are 8-bit successive-approximation ADCs with 8-channel multiplexers and 100 µs conversion time at a 640 kHz clock. However, the designer must verify the specific manufacturer's datasheet for the exact grade, temperature range, and package finish (the NOPB suffix indicates lead-free construction), and confirm that the board's soldering process and reliability requirements accept the lead-free finish.

Both the ADC0809CCN and ADC0808CCN/NOPB are specified for a maximum clock frequency of 640 kHz, which yields a conversion time of approximately 100 µs. The clock can be supplied externally or generated with an RC network on the CLK pin; the datasheet specifies the clock duty cycle and minimum pulse width that must be observed for rated performance.

Both devices convert unipolar analog inputs over a range set by the reference pins: VREF(+) and VREF(−). With VREF(+) = 5 V and VREF(−) = 0 V, the input range is 0 V to 5 V, and the 8-bit output code is ratiometric to the reference. The reference inputs must be driven within the specified limits, and VREF(+) must not exceed VCC. The devices are not specified for bipolar input operation without external level shifting.

Both the ADC0809CCN and ADC0808CCN/NOPB operate from a single 5 V supply (VCC = 5 V nominal). The datasheet specifies typical power dissipation on the order of 15 mW at 5 V, with the exact value depending on clock frequency and conversion rate. The digital outputs are tri-state and TTL-compatible, allowing direct interface to most 8-bit microcontrollers and buses.

The NOPB suffix designates a lead-free (Pb-free) package finish and RoHS-compliant construction per the manufacturer's ordering nomenclature. It does not change the electrical function, pinout, or conversion specifications. Designs that must comply with RoHS or lead-free assembly requirements should use the NOPB variant, while the ADC0809CCN may be supplied with a leaded (non-RoHS) finish depending on the manufacturer's ordering code; always confirm the finish from the specific datasheet or distributor listing.

Both devices are suited to medium-speed, multi-channel data acquisition where 8-bit resolution and approximately 100 µs conversion time are adequate, such as industrial process monitoring, instrumentation, battery-powered measurement systems, and microcontroller-based sensor interfaces. Their 8-channel multiplexer with address latch allows multiple analog sensors to share one converter, reducing component count in cost-sensitive designs.