TLP187(TPL,E

TLP187(TPL,E is the complete Toshiba ordering string for the TLP187 phototransistor-output photocoupler in the SO6 package — the string is not truncated: Toshiba tape-suffix strings in this family are written without a closing bracket, and the maker’s datasheet (revision 6.0) decodes the elements in its ordering section, TPL as the tape type (L direction) and E as the [[G]]/RoHS-compatible form. One reading matters most: TPL is a packing-direction element, not a current-transfer-ratio rank — this type has no CTR ranks, and its single transfer specification is a current transfer ratio of 1000 % to 4000 % at 1 mA input current. Verified figures: input forward voltage of 1.1 V minimum, 1.25 V typical and 1.4 V maximum at 10 mA, collector-emitter breakdown of 300 V minimum, isolation voltage of 3750 Vrms minimum, forward current of 50 mA maximum, collector current of 150 mA maximum, and operation from -55 °C to +110 °C. The selection point is the Darlington-class transfer gain: a milliamp of LED drive delivers the collector current that a standard coupler would need far more input current to reach, for isolated feedback and low-drive signal transfer. Selection advice: design the input side to the 1 mA condition the transfer ratio is specified at — reading this code against a rank-banded coupler’s table mixes two different specification systems. Parameters verified against the Toshiba TLP187 datasheet, revision 6.0.