Datasheet
3D Model
ST312RAK Series
ST312RAK Series features excellent Q, low DCR and very high SRF.
- Very low profile – only 60% of the height of our other 0603 inductor series
- Excellent Q, low DCR and very high SRF
Specifications
Electrical specifications at 25°C.
| Part number 1 | Inductance (nH) 2 | Tolerance (%) 3 | 900 MHz | 1.7 GHz |
Q min
@ 250 MHz 4 |
SRF min (GHz) 5 | DCR max (mΩ) 6 | Imax (mA) | ||
|---|---|---|---|---|---|---|---|---|---|---|
| L typ | Q typ 4 | L typ | Q typ 4 | |||||||
| ST312RAK1N0JRZ | 1.0 | 5 | 980 | 39 | 990 | 58 | 20 | 5.0 | 45.0 | 800 |
| ST312RAK2N0JRZ | 2.0 | 5 | 1980 | 46 | 1980 | 70 | 28 | 5.0 | 34.0 | 800 |
| ST312RAK2N3JRZ | 2.3 | 5 | 2100 | 50 | 2130 | 74 | 25 | 5.0 | 46.0 | 800 |
| ST312RAK2N4JRZ | 2.4 | 5 | 2270 | 55 | 2280 | 81 | 20 | 5.0 | 52.0 | 800 |
| ST312RAK2N5JRZ | 2.5 | 5 | 2480 | 52 | 2500 | 77 | 21 | 5.0 | 60.0 | 800 |
| ST312RAK3N0_RZ | 3.0 | 5,2 | 2960 | 57 | 2970 | 82 | 21 | 5.0 | 39.0 | 800 |
| ST312RAK3N3_RZ | 3.3 | 5,2 | 3270 | 60 | 3330 | 83 | 24 | 5.0 | 39.0 | 800 |
| ST312RAK3N6_RZ | 3.6 | 5,2 | 3580 | 69 | 3630 | 95 | 26 | 5.0 | 44.0 | 800 |
| ST312RAK3N9_RZ | 3.9 | 5,2 | 3870 | 68 | 3950 | 90 | 32 | 5.0 | 50.0 | 800 |
| ST312RAK4N3_RZ | 4.3 | 5,2 | 4260 | 58 | 4340 | 84 | 27 | 5.0 | 76.0 | 800 |
| ST312RAK4N7_RZ | 4.7 | 5,2 | 4660 | 50 | 4750 | 70 | 24 | 4.4 | 120 | 640 |
| ST312RAK5N1_RZ | 5.1 | 5,2 | 5120 | 68 | 5180 | 93 | 23 | 4.4 | 50.0 | 800 |
| ST312RAK5N6_RZ | 5.6 | 5,2 | 5600 | 67 | 5730 | 90 | 29 | 4.0 | 58.0 | 800 |
| ST312RAK6N8_RZ | 6.8 | 5,2 | 6780 | 60 | 7000 | 81 | 22 | 3.6 | 80.0 | 700 |
| ST312RAK7N2_RZ | 7.2 | 5,2 | 7190 | 65 | 7440 | 88 | 31 | 3.6 | 47.0 | 800 |
| ST312RAK8N2_RZ | 8.2 | 5,2 | 8180 | 60 | 8460 | 78 | 28 | 3.4 | 75.0 | 800 |
| ST312RAK9N5_RZ | 9.5 | 5,2 | 9520 | 63 | 9920 | 80 | 27 | 3.1 | 92.0 | 700 |
| ST312RAK10N_RZ | 10 | 5,2 | 10000 | 67 | 10400 | 85 | 32 | 3.1 | 75.0 | 800 |
| ST312RAK11N_RZ | 11 | 5,2 | 11000 | 66 | 11500 | 86 | 28 | 3.2 | 110 | 750 |
| ST312RAK12N_RZ | 12 | 5,2 | 12000 | 68 | 12700 | 85 | 29 | 2.8 | 130 | 620 |
| ST312RAK15N_RZ | 15 | 5,2 | 15200 | 65 | 16100 | 80 | 26 | 2.6 | 145 | 580 |
| ST312RAK16N_RZ | 16 | 5,2 | 16300 | 63 | 17500 | 76 | 29 | 2.4 | 175 | 500 |
| ST312RAK18N_RZ | 18 | 5,2 | 18100 | 66 | 19200 | 80 | 28 | 2.3 | 200 | 500 |
| ST312RAK20N_RZ | 20 | 5,2 | 20200 | 67 | 21600 | 80 | 28 | 2.3 | 175 | 500 |
| ST312RAK22N_RZ | 22 | 5,2 | 22400 | 60 | 24300 | 70 | 29 | 2.2 | 220 | 480 |
| ST312RAK24N_RZ | 24 | 5,2 | 24400 | 61 | 26500 | 72 | 25 | 2.1 | 240 | 460 |
| ST312RAK27N_RZ | 27 | 5,2 | 27400 | 62 | 29800 | 75 | 29 | 2.0 | 270 | 440 |
| ST312RAK30N_RZ | 30 | 5,2 | 30500 | 62 | 33900 | 73 | 24 | 1.9 | 330 | 400 |
| ST312RAK33N_RZ | 33 | 5,2 | 34000 | 55 | 39100 | 61 | 28 | 1.7 | 330 | 400 |
| ST312RAK36N_RZ | 36 | 5,2 | 37200 | 61 | 42300 | 63 | 28 | 1.8 | 335 | 440 |
| ST312RAK39N_RZ | 39 | 5,2 | 40300 | 60 | 45300 | 65 | 28 | 1.8 | 400 | 380 |
| ST312RAK43N_RZ | 43 | 5,2 | 44500 | 57 | 51300 | 60 | 28 | 1.6 | 440 | 380 |
| ST312RAK47N_RZ | 47 | 5,2 | 48200 | 55 | 57800 | 57 | 28 | 1.5 | 540 | 340 |
| ST312RAK51N_RZ | 51 | 5,2 | 53000 | 55 | 63200 | 55 | 28 | 1.4 | 570 | 310 |
Notes
- When ordering, specify tolerance, termination and screening codes: e.g. ST312RAK51NGRZ.
- Inductance measured at 250 MHz, 0.1 Vrms, 0 Adc using Coilcraft SMD-A fixture in Agilent/HP 4287A impedance analyzer.
- Tolerances in bold are stocked for immediate shipment.
- Q measured using Agilent/HP4291A with Agilent/HP 16193 test fixture.
- SRF measured using Agilent/HP 8722ES network analyzer and Coilcraft SMD‑D test fixture.
- DCR measured on Cambridge Technology micro-ohmmeter and Coilcraft CCF858 test fixture.
Tolerance:
- G = 2%
- J = 5% (Table shows stock tolerances in bold.)
Termination:
- R = Matte tin over nickel over silver-platinum glass frit.
- P = Tin-lead (63/37) over 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.
Screening:
- Z = Unscreened
- Y = Unscreened (SLDC Option A)
- W = Unscreened (SLDC Option B)
- H = Coilcraft CP-SA-10001 Group A
- G = Coilcraft CP-SA-10001 Group A (SLDC Option A)
- D = Coilcraft CP-SA-10001 Group A (SLDC Option B)
- 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 +125°C with Irms current
Storage temperature range:
Component: –55°C to +140°C.
Tape and reel packaging: –55°C to +80°C.
Tape and reel packaging: –55°C to +80°C.
Maximum part temperature:
+140°C (ambient + temp rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
Performance curves
L vs Frequency
Q vs Frequency
Physical characteristics
| A max | B max | C max | D | E | F | G | H | |
|---|---|---|---|---|---|---|---|---|
| 0.064 | 0.033 | 0.024 | 0.013 | 0.030 | 0.025 | 0.025 | 0.040 | inches |
| 1,63 | 0,84 | 0,61 | 0,33 | 0,76 | 0,64 | 0,64 | 1,02 | mm |
Height dimension (C) is before optional solder application. For maximum height dimension including solder, add 0.006 in / 0,152 mm.
General specification
Core Material:
Ceramic
Weight:
1.4 – 2.3 mg
Packaging:
Packaging 2000/7″reel; Paper tape: 8 mm wide, 0.68 mm thick, 4 mm pocket spacing
Temperature coefficient of inductance:
+25 to +125 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.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. See Doc787_PCB_Washing.pdf.