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HomeProductsInductors, Coils, ChokesFixed InductorsRL622-331K-RC
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RL622-331K-RC - Bourns Inc.

Manufacturer Part Number
RL622-331K-RC
Manufacturer
Bourns, Inc.
Allelco Part Number
98D-RL622-331K-RC
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,638 pcs available, New & Original
Parts Description
FIXED IND 330UH 540MA 850MOHM TH
Package
Radial, Vertical Cylinder
Data sheet
RL622-331K-RC.pdf

PCN Assembly/Origin

2.73KHz.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 9638
  • Unit Price: $0.505
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.505 $0.51
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

RL622-331K-RC Tech Specifications
Bourns Inc. - RL622-331K-RC technical specifications, attributes, parameters and parts with similar specifications to Bourns Inc. - RL622-331K-RC

Product Attribute Attribute Value
Manufacturer Bourns, Inc.
Type Drum Core, Wirewound
Tolerance ±10%
Supplier Device Package -
Size / Dimension 0.335' Dia (8.50mm)
Shielding Unshielded
Series RL622
Ratings -
Q @ Freq 20 @ 796kHz
Package / Case Radial, Vertical Cylinder
Package Bulk
Product Attribute Attribute Value
Operating Temperature -55°C ~ 105°C
Mounting Type Through Hole
Material - Core Ferrite
Inductance Frequency - Test 796 kHz
Inductance 330 µH
Height - Seated (Max) 0.433' (11.00mm)
Frequency - Self Resonant 2.3MHz
DC Resistance (DCR) 850mOhm Max
Current Rating (Amps) 540 mA
Current - Saturation (Isat) -
Base Product Number RL622

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) Not Applicable
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8504.50.4000

Frequently Asked Questions(FAQ)

What is the DC resistance of the RL622-331K-RC and how does it affect power dissipation in my circuit?
The RL622-331K-RC has a maximum DC resistance (DCR) of 850 mOhm. At the rated current of 540 mA, this produces power dissipation of approximately 247 mW (I²R = 0.54² × 0.85). In applications with sustained DC bias or low-frequency switching, this resistive loss becomes the dominant thermal contributor. For designs operating near the 540 mA limit, verify that the component's thermal environment can dissipate this power without exceeding the 105°C upper operating temperature, especially in enclosed or thermally constrained layouts.
Can the RL622-331K-RC be used in high-frequency switching supplies, and what performance degradation should I expect?
The RL622-331K-RC exhibits a self-resonant frequency of 2.3 MHz and demonstrates a Q factor of 20 at 796 kHz. While these characteristics support operation into the hundreds of kilohertz range, the low Q value indicates significant core and winding losses at elevated frequencies. In boost or buck converter designs operating above 500 kHz, the RL622-331K-RC's energy losses increase due to core hysteresis and skin effect, reducing overall converter efficiency compared to ferrite cores optimized for higher-frequency operation. For frequencies below 200 kHz, performance remains predictable and well-characterized.
How does the RL622-331K-RC compare to shielded inductors for noise-sensitive analog circuits?
The RL622-331K-RC is an unshielded design, meaning its magnetic field extends into surrounding space and couples readily to nearby traces and components. In noise-sensitive applications such as precision instrumentation or low-noise audio circuits, this unshielded topology creates mutual inductance with signal paths, potentially introducing coupling noise and degrading performance. Shielded alternatives provide containment of the magnetic field, reducing crosstalk by 20–40 dB depending on shield effectiveness. For low-level analog signal acquisition or RF front-end circuits, shielded equivalents should be prioritized; the RL622-331K-RC is better suited to power delivery or DC-biased filtering where field radiation is less critical.
What saturation characteristics should I consider when designing the RL622-331K-RC into a current-source or PWM-controlled circuit?
The RL622-331K-RC datasheet does not specify an explicit saturation current (Isat) threshold. This absence indicates that saturation is either negligible within the rated 540 mA envelope or occurs at a margin significantly above rated current. The ferrite drum core exhibits gradual inductance rolloff rather than sharp saturation. When designing with PWM ripple currents, confirm that peak current (DC bias plus half the ripple amplitude) remains below 540 mA to maintain predictable inductance within ±10% tolerance. For circuits where transient overcurrent is possible—such as inrush-limited designs—operate with margin below 450 mA to avoid inductance collapse and uncontrolled current rise.
Is the RL622-331K-RC suitable as a replacement for the TSL0808RA-331KR45-PF, and what differences should I verify?
Both the RL622-331K-RC and TSL0808RA-331KR45-PF share the 330 µH nominal inductance, making direct substitution nominally possible. However, differences exist in physical footprint (the RL622-331K-RC measures 0.335" diameter × 0.433" height), thermal dissipation characteristics, and frequency response. Before substituting, verify that the RL622-331K-RC's radial through-hole footprint matches your PCB layout and that the 850 mOhm DCR aligns with your thermal budget. The RL622-331K-RC's lower Q factor at operating frequencies may reduce efficiency in high-frequency designs compared to the TSL0808RA alternative, so comparative efficiency modeling is recommended for switching frequencies above 300 kHz.
How does temperature affect the inductance value and DCR of the RL622-331K-RC across its operating range?
The RL622-331K-RC specifies inductance tolerance of ±10% and operates from −55°C to +105°C. Ferrite cores exhibit negative temperature coefficients, with inductance typically decreasing 200–400 ppm/°C across this temperature span. Over a 160°C operating range, inductance drift may approach 3–6%, reducing worst-case inductance from 363 µH (upper tolerance at cold temperature) to approximately 340 µH (nominal at 25°C) at elevated temperature. The 850 mOhm DCR also increases with temperature due to copper resistivity temperature coefficient (~0.39%/°C), adding approximately 50–70 mOhm across the full range. In precision filtering or LC resonant circuits, account for this drift; in broadband current-limiting applications, the effect is generally negligible.
What PCB layout practices minimize coupling and thermal issues when placing the RL622-331K-RC near sensitive signals?
Because the RL622-331K-RC is unshielded, its radial magnetic field couples most strongly to parallel traces within 5–10 mm distance. Position the component with its cylinder axis perpendicular to high-impedance signal lines (such as ADC inputs or low-level analog signals) to minimize flux linkage. Maintain at least 15 mm clearance between the RL622-331K-RC and noise-sensitive traces; if clearance is constrained, route sensitive signals in orthogonal directions or beneath ground planes. Thermally, ensure adequate airflow around the component since the 247 mW dissipation at 540 mA can create local hot spots in dense assemblies. In confined spaces, consider mounting orientation to facilitate convective cooling and verify board temperature rise under sustained load.
Can the RL622-331K-RC withstand inrush current transients in soft-start or inrush-limited applications without permanent degradation?
The RL622-331K-RC does not publish an Isat specification, but the ferrite drum core's gradual saturation behavior means brief transients above 540 mA cause reversible inductance reduction rather than permanent core damage. However, sustained currents above 600 mA risk accelerated aging due to core heating and winding insulation stress. For soft-start circuits where 1–2 A inrush occurs for 10–100 ms, the RL622-331K-RC survives without failure, though inductance may drop temporarily during the transient. In designs with frequent or prolonged overcurrent events, derating to 400–450 mA steady-state operation extends component life and provides margin for transient survivability. Verify thermal rise under worst-case inrush duty to ensure core temperature remains below 105°C.
What is the minimum inductance I should expect from the RL622-331K-RC at elevated temperature and frequency, and how does this affect filter performance?
The RL622-331K-RC specifies 330 µH with ±10% tolerance and exhibits inductance variation due to temperature coefficient and frequency-dependent core permeability. At 105°C and frequencies approaching 2 MHz (near self-resonance), worst-case inductance may reduce to approximately 300 µH (−10% tolerance combined with thermal and frequency effects). In filter designs targeting a specific corner frequency (e.g., f_c = 1/(2π√LC) for LC low-pass filters), this drift shifts the cutoff by 5–10%, potentially allowing increased ripple or noise into the signal chain. For precision filtering, measure or model the RL622-331K-RC's effective inductance across your operating temperature and frequency window to confirm filter performance meets specifications.
How does the Q factor of 20 @ 796 kHz for the RL622-331K-RC compare to air-core alternatives, and what does this mean for my design?
A Q of 20 at 796 kHz reflects moderate loss in the ferrite drum core and windings; air-core inductors typically achieve Q values of 50–150 in the same frequency range due to absence of core loss. The lower Q of the RL622-331K-RC means greater energy dissipation per cycle, reducing efficiency in resonant or tuned circuit applications. However, the ferrite core provides compact form factor and 330 µH inductance in a small 8.5 mm diameter package, whereas achieving equivalent inductance with air-core geometry would require significantly larger dimensions. In resonant tank or bandpass filter designs, the RL622-331K-RC's moderate Q limits selectivity and may require higher-Q capacitors to compensate; for current-limiting or energy storage applications, the Q impact is secondary to inductance stability.
Is the RL622-331K-RC RoHS3 compliant, and does this affect reliability or procurement in regulated environments?
The RL622-331K-RC is RoHS3 compliant and REACH unaffected, confirming absence of restricted substances (lead, cadmium, mercury, hexavalent chromium, PBBs, and PBDEs). This compliance supports procurement into medical, automotive, and European markets where RoHS3 certification is mandatory. The component carries an ECCN designation of EAR99 (no export licensing required to most destinations) and HTSUS code 8504.50.4000, facilitating international supply chain integration. Moisture sensitivity is not applicable (MSL not assigned), indicating the RL622-331K-RC is not moisture-sensitive during storage or assembly, reducing handling precautions compared to high-pin-count semiconductors.

Parts with Similar Specifications

The three parts on the right have similar specifications to Bourns Inc. RL622-331K-RC

Product Attribute RL622-332K-RC RL622-3R3K-RC RL622-330K-RC RL622-391K-RC
Part Number RL622-332K-RC RL622-3R3K-RC RL622-330K-RC RL622-391K-RC
Manufacturer Bourns Inc. Bourns Inc. Bourns Inc. Bourns Inc.
Q @ Freq - - - -
DC Resistance (DCR) - - - -
Inductance - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Material - Core - - - -
Shielding - - - -
Height - Seated (Max) - - - -
Current - Saturation (Isat) - - - -
Current Rating (Amps) - - - -
Series - - - -
Type - - - -
Inductance Frequency - Test - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Mounting Type - Surface Mount Through Hole Surface Mount
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Frequency - Self Resonant - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Size / Dimension - - - -
Ratings - - - -
Tolerance - - - -

RL622-331K-RC Datasheet PDF

Download RL622-331K-RC pdf datasheets and Bourns Inc. documentation for RL622-331K-RC - Bourns Inc..

Datasheets
Cylindrical Battery Holders.pdf
PCN Assembly/Origin
2.73KHz.pdf
Environmental Information
RoHS 6x00, RLxxx, RLxxxS Series.pdf Bourns REACH.pdf

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RL622-331K-RC Image

RL622-331K-RC

Bourns Inc.
98D-RL622-331K-RC

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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