This paper presents a self‐protected wide‐range bi‐directional voltage‐to‐current (V–I) converter. The proposed V–I converter is a self‐contained cell that operates independently and implements high precision conversion with a transconductance set by resistors. Compared with conventional structures, the proposed scheme features safety and reliability. The conversion range is widened since the internal biasing current is not starved and is adaptively set based on the input voltage. The proposed V–I structure was fabricated in a 0.18‐µm Bipolar‐CMOS‐DMOS (BCD) process with a die area of 0.0825 mm2. The measured non‐linearity across an input voltage range from −70 to 70 V was within ±0.2%. The total harmonic distortion was −63 dB at 1 kHz and the delay of conversion was within 3 µs.