For more information, please visit the product page. rev. DESCRIPTION: rotary encoder PART NUMBER: EC251AB ELECTRICAL SPECIFICATIONS output waveform output signals current consumption output voltage Square wave A, B phase 20 mA max. Vcc ~ 0.5 V min. 0.7 V max. -0.1 mA max. 5 V dc ± 5% 25 100 Hz “H” “L” output current supply voltage output resolution (ppr) frequency response MECHANICAL SPECIFICATIONS max shaft load, radial: axial: starting torque rotational angle maximum speed rotational life weight 1 kgf 1 kgf 0.4 ±0.2 N·cm max. (41 ±20 gf·cm max.) 360° continuous 120 RPM 1,000,000 cycles 20 g ENVIRONMENTAL SPECIFICATIONS operating temp storage temp humidity vibration shock 0° to +60° C -20° to +80° C 85% RH, no condensation 10 ~ 55 Hz. 1.5 mm, 2 hours 50 G, 6 ms, 3 axes, 3 reps ORDERING INSTRUCTIONS EC251X050X Detent: A = Without detent B = With detent Termination options: A = Solder holes B = Connector C = Cable D = PC board mount 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 page 1 of 2 date 08/2008 For more information, please visit the product page. rev. page 2 of 2 date 08/2008 DESCRIPTION: rotary encoder PART NUMBER: EC251AB OUTPUT CIRCUIT OUTPUT WAVEFORM EXTERNAL CIRCUIT INTERNAL CIRCUIT (Clockwise rotation viewed from front) 1 +5V Detent Position R1 A R2 EC251X R3 PI1 2 Ch B PI2 3 Ch A +5V 1 74HC14 2 Output B 74HC14 3 Output A 4 GND B 4 5 NC R2, R3: 100 k Ω 6 NC MECHANICAL DRAWING EC251X050A 25 10 12.5 M9 P=0.75 17 +0 +0 8 - 0.1 Ø6 - 0.1 2 Ø3 14.5 16 3.5 C 4 8 6-ø1 2 10 20 Pin #1 8.2 13 Mounting Hole Dimensions PCB Footprint 2-Ø2.2 10 14.5 8.1 23.1 2 6-Ø1 ø9.2 EC251X050B EC251X050D EC251X050C 20 12.5 JST: 6P-SAN 6 9.4 4.5 JST: B6B-PH-K-S 1 20 7.4 AWG28 UL1007 9.6 10 8.5 Ø2 150 0.5 Pin #1 1.8 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 3.5