What the CD4071BPWR is and where it fits
The Texas Instruments CD4071BPWR is a quad 2-input OR gate from the 4000B series, packaged in a 14-TSSOP for surface-mount assembly. It operates across a 3V to 18V supply range, drawing a maximum quiescent current of 1 µA, and is rated over the full military temperature range of -55°C to 125°C. This makes it a straightforward choice for industrial control, automotive body electronics, and any system where the supply rail is not tightly regulated or where the board must survive wide thermal swings.
Supply voltage and propagation delay — what they mean for your design
The 3V to 18V supply range is the headline feature of the 4000B family. Maximum propagation delay is 90 ns at 15V with a 50 pF load.
Temperature range and output drive
The -55°C to 125°C operating range covers avionics, downhole instrumentation, and outdoor telecom cabinets where the ambient can swing from a cold start to full solar load. Output current is symmetrical at 3.4 mA source and sink — enough to drive a standard TTL input or a small LED, but not a relay coil directly. The input logic thresholds scale with supply: low from 1.5V to 4V, high from 3.5V to 11V, so the part interprets a 3.3V logic signal correctly when running from a 5V or 12V rail.
Lifecycle and compliance
The CD4071BPWR is listed as Active with no end-of-life notice. It is ROHS3 compliant, so it meets current European and global restrictions on hazardous substances. The 4000B series has been in production for decades, and TI continues to support it. For a BOM line that needs a proven, non-obsolescent glue-logic gate, this part carries no LTB risk.