Product Overview
The SNR4020 Series is an automatic assembly, magnetic resin shielded SMD power inductor designed to minimize buzz noise to ultra-low levels. It features a closed magnetic circuit design for reduced leakage flux and strong EMI resistance, along with a metallization on the ferrite core for excellent shock resistance and durability. This series offers large current handling capabilities with low DCR, saving PCB real estate and power. Applications include LED backlights, flat-screen TVs, notebooks, desktop computers, servers, graphic cards, portable gaming devices, personal navigation systems, automotive products, and communication equipment.
Product Attributes
- Brand: SHENZHEN LANTU MICRO ELECTRIC TECHNOLOGY CO., LTD.
- Series: SNR4020 Series
- Construction: Magnetic resin shielded, automatic assembly
- Certifications: RoHS, Halogen Free and REACH Compliance
- Core Material: Ferrite Core
- Magnetic Circuit: Closed magnetic circuit design
Technical Specifications
| Part No. | Inductance (H) | Tolerance | Test Frequency | Test Voltage | DCR () Typical | DCR () Max | Saturation Current (A) Max | Temperature Rise Current (A) Max | Dimensions (LWH) (mm) |
| SNR4020-R47M | 0.47 | 20% | 100KHz | 1.0V | 0.022 | 0.029 | 7.00 | 3.30 | 4.04.02.0 |
| SNR4020-1R0M | 1.0 | 20% | 100KHz | 1.0V | 0.029 | 0.038 | 4.78 | 2.15 | 4.04.02.0 |
| SNR4020-1R5M | 1.5 | 20% | 100KHz | 1.0V | 0.035 | 0.045 | 4.45 | 2.15 | 4.04.02.0 |
| SNR4020-2R2M | 2.2 | 20% | 100KHz | 1.0V | 0.035 | 0.046 | 3.40 | 1.85 | 4.04.02.0 |
| SNR4020-3R3M | 3.3 | 20% | 100KHz | 1.0V | 0.070 | 0.091 | 3.20 | 1.40 | 4.04.02.0 |
| SNR4020-4R7M | 4.7 | 20% | 100KHz | 1.0V | 0.075 | 0.098 | 2.35 | 1.34 | 4.04.02.0 |
| SNR4020-6R8M | 6.8 | 20% | 100KHz | 1.0V | 0.125 | 0.163 | 2.20 | 1.04 | 4.04.02.0 |
| SNR4020-8R2M | 8.2 | 20% | 100KHz | 1.0V | 0.148 | 0.185 | 1.75 | 1.00 | 4.04.02.0 |
| SNR4020-100M | 10 | 20% | 100KHz | 1.0V | 0.165 | 0.215 | 1.60 | 0.90 | 4.04.02.0 |
| SNR4020-150M | 15 | 20% | 100KHz | 1.0V | 0.230 | 0.300 | 1.35 | 0.77 | 4.04.02.0 |
| SNR4020-220M | 22 | 20% | 100KHz | 1.0V | 0.350 | 0.455 | 1.05 | 0.62 | 4.04.02.0 |
| SNR4020-330M | 33 | 20% | 100KHz | 1.0V | 0.550 | 0.710 | 0.85 | 0.49 | 4.04.02.0 |
| SNR4020-470M | 47 | 20% | 100KHz | 1.0V | 0.710 | 0.920 | 0.74 | 0.44 | 4.04.02.0 |
| SNR4020-680M | 68 | 20% | 100KHz | 1.0V | 1.060 | 1.380 | 0.60 | 0.36 | 4.04.02.0 |
| Inductance Tolerance Options | Packing Options |
| J: 5%, K: 10%, L: 15%, M: 20%, P: 25%, N: 30% | B: Bulk Package, T: Tape & Reel |
| Environmental Data | Operating Temperature |
| Includes coils self-temperature rise | -40 to +125 |
| Shape and Dimensions (mm) | A | B | C (Max) | D | E | F (Typ) | G (Typ) | H (Typ) |
| SNR4020 | 4.00.3 | 4.00.3 | 2.0 | 2.10.2 | 3.30.2 | 1.1 | 1.9 | 3.7 |
| Packaging Quantity | Reel (PCS) | Inside Box (PCS) | Outside Carton (PCS) |
| SNR4020 | 3000 | 12,000 | 48,000 |
| Reliability Testing Items | Requirements | Test Methods and Remarks |
| Terminal Strength (SMT) | Meet requirements without any loose terminal | Pulling test based on terminal area; Solder paste thickness: 0.12mm; Keep time: 101s; Speed: 1.0mm/s |
| Terminal Strength (DIP) | Meet requirements without any loose terminal | Applied force based on terminal diameter; Duration: 10sec |
| Resistance to Flexure | No visible mechanical damage | Flexure: 2mm; Pressurizing Speed: 0.5mm/sec; Keep time: 30 sec |
| Dropping | No case deformation or change in appearance; No short and no open | Drop packaged products from 1m high in 1 angle, 3 ridges and 6 surfaces, twice in each direction |
| Solderability | Wetting shall exceed 75% coverage; Terminals must have 95% minimum solder coverage | Solder temperature: 2402; Duration: 3 sec; Solder: Sn/3.0Ag/0.5Cu; Flux: 25% Resin and 75% ethanol |
| Vibration | No visible mechanical damage; Inductance change: Within 10%; Q factor change: Within 20% | Frequency 10-55 Hz, amplitude 1.5mm, 2 hours in each of 3 mutually perpendicular directions |
| Thermal Shock | No visible mechanical damage; Inductance change: Within 10%; Q factor change: Within 20% | 100 cycles of (85~125) to (-55~40); Transforming interval: Max. 20 sec |
| Low temperature Storage | No visible mechanical damage; Inductance change: Within 10%; Q factor change: Within 20% | Temperature: -55~-402; Duration: 962 hours |
| High temperature Storage | No visible mechanical damage; Inductance change: Within 10%; Q factor change: Within 20% | Temperature: 125~852; Duration: 962 hours |
| Damp Heat (Steady States) | No visible mechanical damage; Inductance change: Within 10%; Q factor change: Within 20% | Temperature: 602; Humidity: 90% to 95% RH; Duration: 962 hours |
| Heat endurance of Reflow soldering | No significant defects in appearance; L/L10%; Q/Q30%; DCR/DCR10% | Peak temperature: 260+0/-5, twice reflow |
| Resistance to solvent test | No case deformation or change in appearance or obliteration of marking | Dip into IPA solvent for 50.5Min, dry for 5Min, brush 10 times |
| Overload test | During the test no smoke, no peculiar smell, no fire; The characteristic is normal after test | Apply twice rated current for 5 minutes |
| Voltage resistance test | During the test no breakdown; The characteristic is normal after test | DC1000V, Current: 1mA, Time: 1Min |
Note on Saturation Current: DC current at which inductance drops 30% from its value without current.
Note on Temperature Rise Current: The actual value of DC current when the temperature rise is T 40 (Ta=25).
Note on Rated DC Current: The lesser value between Isat or Irms.
Special Remind: Circuit design, component, PCB trace size and thickness, airflow and other cooling provisions all affect the part temperature. Part temperature should be verified in the end application.
