1221N5M2B

3.3~12V Precision DC Coreless Motor
Diameter: 12mm; Length: 21mm; Voltage: 3.3~12V; Max. output power: 0.06~0.69W; Speed: 2800~9100rpm; Nominal torque: 0.1~1mNm.

Applications: precision drives in medical equipment and devices, healthcare products, robotics, and industrial automation.
Options: Lead wires length, Shaft length, Special coils, Gearheads, Encoder.

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Parameter Outline Drawing Characteristic Curve Download

Characteristics	Unit	34-78-3.3	45-84.5.0	58-91-12.0
Voltage	V	3.3	5.0	12.0
Terminal resistance	Ω	6.4	9.8	50
No-load speed	rpm	7800	8400	9100
No-load current	mA	12	10	5
Stall torque	mNm	2.0	2.8	2.9
Stall current	mA	520	510	240
Nominal torque	mNm	0.2	0.5	0.5
Nominal speed	rpm	7020	6890	7530
Nominal current	mA	60	100	50
Max.output power	W	0.41	0.61	0.69
Max.efficiency	%	72	74	73
Back-EMF constant	mV/rpm	0.4	0.6	1.3
Torque constant	mNm/A	3.9	5.6	12.3
Speed/torque gradient	rpm/mNm	3900	3000	3100
Rotor inertia	gcm2	0.15	0.15	0.15
Weight	g	10.4	10.4	10.4