def calculate_package_base_hazard_rate(n_active_pins: int) -> float:
    """Calculate the package base hazard rate (lambdaBP).

    :param n_active_pins: the number of active (current carrying) pins.
    :return: _lambda_bd; the calculated package base hazard rate.
    :rtype: float
    """
    return 0.0022 + (1.72e-5 * n_active_pins)