What this is
The JST B5P-VH-B is the 5-circuit member of the VH series — a shrouded single-row board-to-wire header rated 10 A per contact at 250 V. The 0.156 inch (3.96 mm) pitch, 10 A current rating, and tin-over-brass contact finish place this firmly in low-to-medium power interconnect duty: wire harnesses, power-distribution boards, and equipment panels where a locking-ramp header keeps the mated pair seated under vibration. All 5 positions are loaded; the shroud is single-wall on one side, which keys the orientation and prevents mis-mate with an unshrouded receptacle.
What the ratings mean
The 10 A per circuit rating reflects the contact material and cross-section — brass with tin plating on both the mating face and the solder tail. Tin is functional for the current but limits re-mating cycle life compared to a gold-plated option; if the application requires more than a few dozen mate cycles, the contact finish is the first thing to scrutinise. The 250 V rating is typical for this pitch class and covers single-phase AC and DC power rails well within most industrial panel limits. The insulation body is PBT glass-filled rated UL94 V-0, so the housing survives the回流 heat of through-hole processing and does not support flame propagation.
Fit against the BOM line
For the engineer matching a BOM entry: the 5-position count and 3.96 mm pitch are the two numbers that must match the board footprint and the mating housing. The insulation height of 0.370 inch (9.40 mm) determines the standoff above the PCB surface — relevant when the board stacks under a panel face. The 0.303 inch (7.70 mm) mating length confirms adequate engagement depth with the matching receptacle. If the BOM specifies the base series number B5P-VH without the -B suffix, treat them as the same form-fit part — the -B designation carries no electrical or mechanical delta in this listing.