13.56 MHz ISM band and load capacitance
The ECS-135.60-18-33-JGN-TR: The 18 pF load capacitance rating is the target shunt capacitance the driving oscillator circuit should present to hit the specified pull range.
ECX-32 package and board-fit
The ECX-32 series is ECS Inc.'s industrial-grade surface-mount line — the no-lead ceramic package gives better thermal coupling to the board than a cerpac, which matters when the crystal sits next to an RF frontend that dissipates heat during extended transmit bursts.
ESR and temperature grade
Equivalent series resistance is specified at 100 Ω maximum — most oscillator ICs designed for 13.56 MHz crystals present a drive level well under the 200 μW that a 100 Ω ESR at that frequency allows, so startup is not a concern for a properly matched driver.
Sourcing posture
No official successor or cross-reference is listed for this specific order code; confirm the 18 pF load capacitance matches the target board's oscillator design before committing to a second-source candidate from the same series.