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Introduction
Specifications
Environmental
Performance curves
Physical characteristics
Soldering/Washing

Datasheet 3D Model

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ST312RAM472

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Specifications

Electrical specifications at 25°C.

Part number 1	Inductance (nH) 2 (Tolerance: ±5%)	Impedance typ (Ω) @ 100 MHz	Q min @ 7.9 MHz 3	SRF min (MHz) 4	DCR max (Ω) 5	Imax (A)	Color code
Part number 1	Inductance (nH) 2 (Tolerance: ±5%)	Impedance typ (Ω) @ 100 MHz	Q min @ 7.9 MHz 3	SRF min (MHz) 4	DCR max (Ω) 5	Imax (A)	Color code
ST312RAM472JRZ	4700	2100	12	45	1.500	0.22	Yellow

Notes

When ordering, please specify termination and screening codes: e.g. ST312RAM103JRZ.
Inductance measured using a Coilcraft SMD-A fixture in an Agilent/ HP 4286A impedance analyzer or equivalent with Coilcraft-provided correlation pieces.
Q measured at the same frequency as inductance using an Agilent/ HP 4291A with an Agilent/HP 16197A test fixture or equivalents.
SRF measured using an Agilent/HP 8753ES network analyzer or equivalent and a Coilcraft SMD-D test fixture.
DCR measured on a Keithley 580 micro-ohmmeter or equivalent and a Coilcraft CCF1010 test fixture.

Termination:

R = Matte tin over nickel over silver-platinum-glass frit.
Q = Tin-silver-copper (95.5/4/0.5) over tin over nickel over silver-platinum-glass frit. (Special order, added cost)
P = Tin-lead (63/37) over tin over nickel over silver-platinum-glass frit. (Special order, added cost)

Screening:

Z = Unscreened
H = Coilcraft CP-SA-10001 Group A
Screening performed to the document’s latest revision.
Lot qualification (Group B) available.
Custom testing also available.
Country of origin restrictions available; prefix options G or F.

Environmental

Ambient temperature range:

–40°C to +85°C with Irms current.

Storage temperature range:

Component: –55°C to +100°C.
Packaging: –55°C to +80°C.

Maximum part temperature:

+100°C (ambient + temp rise).

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Performance curves

L vs Frequency

Q vs Frequency

Z vs Frequency

Physical characteristics

A max	B max	C max	D ref	E	F	G	H	I	J
0.071	0.044	0.036	0.015	0.030	0.013	0.034	0.040	0.025	0.025	inches
1,80	1,12	0,91	0,38	0,76	0,33	0,86	1,02	0,64	0,64	mm

Note: Dimensions are before optional solder application. For maximum overall dimensions including solder, add 0.0025 in / 0,064 mm to B and 0.006 in / 0,15 mm to A and C.

General specification

Core Material:

Ferrite

Weight:

4.3 – 5.7 mg

Packaging:

2000 per 7′′ reel; Paper tape: 8 mm wide, 1.0 mm thick, 4 mm pocket spacing.

Temperature coefficient of inductance:

+50 to +300 ppm/°C.

Soldering/Washing

Moisture Sensitivity Level (MSL):

1 (unlimited floor life at <30°C / 85% relative humidity).

Resistance to soldering heat:

Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles.

Refer to Soldering Coilcraft Components before soldering.