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70F333AI-RC Equivalent & Substitute Parts
Part Overview
The 70F333AI-RC is a 3.3 mH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 53 mA maximum current with 51.6Ohm DC resistance. This through-hole axial component operates across -55°C to 105°C and is classified as obsolete. Due to its obsolete status, equivalent substitute parts with matching electrical and mechanical specifications are necessary for design continuity and procurement alternatives.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 3.3 mH |
| Tolerance | ±5% |
| Current Rating | 53 mA |
| DC Resistance (DCR) | 51.6Ohm Max |
| Shielding | Unshielded |
| Mounting Type | Through Hole |
| Package / Case | Axial |
| Operating Temperature | -55°C ~ 105°C |
| Inductance Test Frequency | 250 kHz |
Substitute Part Grouping Explanation
Substitution eligibility for the 70F333AI-RC is determined by the following critical parameters:
- Inductance Value: Must be 3.3 mH ±5%
- Current Rating: Minimum 53 mA to support circuit requirements
- DC Resistance: Maximum 51.6Ohm to maintain circuit performance
- Mounting Type: Through hole axial configuration required
- Operating Temperature Range: Must support -55°C to 105°C minimum
- Shielding: Unshielded configuration
- RoHS Compliance: ROHS3 compliant status required
The substitute parts listed below meet these core electrical and mechanical criteria, enabling direct functional replacement in applications designed for the 70F333AI-RC.
Parameter Comparison
| Parameter | 70F333AI-RC (Bourns) | 2500R-52J (API Delevan) | B78108S1335J000 (EPCOS - TDK) |
|---|---|---|---|
| Inductance | 3.3 mH | 3.3 mH | 3.3 mH |
| Tolerance | ±5% | ±5% | ±5% |
| Current Rating (Amps) | 53 mA | 61 mA | 62 mA |
| DC Resistance (DCR) | 51.6Ohm Max | 38Ohm Max | 59.5Ohm Max |
| Shielding | Unshielded | Unshielded | Unshielded |
| Mounting Type | Through Hole | Through Hole | Through Hole |
| Package / Case | Axial | Axial | Axial |
| Operating Temperature | -55°C ~ 105°C | -55°C ~ 105°C | -55°C ~ 105°C |
| Q @ Frequency | 52 @ 250kHz | 70 @ 250kHz | 40 @ 252kHz |
| Self Resonant Frequency | 800kHz | 1.6MHz | 900kHz |
| Product Status | Obsolete | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Both substitute parts meet the mandatory electrical and mechanical requirements for replacement of the 70F333AI-RC:
2500R-52J (API Delevan Inc.) is an active product with higher current rating (61 mA) and lower DC resistance (38Ohm Max), providing improved thermal performance. This part is available in Tape & Reel packaging and maintains full ROHS3 compliance with REACH unaffected status.
B78108S1335J000 (EPCOS - TDK Electronics) is an active product with the highest current rating (62 mA) among the substitutes. This ferrite core variant offers higher self-resonant frequency (900kHz) and is available in Cut Tape packaging. ROHS3 compliance is confirmed; however, REACH status is affected, requiring compliance verification for regulated applications.
Selection between these substitutes should be based on packaging requirements, core material preference (molded vs. ferrite), and REACH compliance obligations specific to the end application.
Frequently Asked Questions (FAQ)
Q: Can the 2500R-52J directly replace the 70F333AI-RC? A: Yes. Both parts share identical inductance (3.3 mH ±5%), tolerance, operating temperature range, and axial through-hole configuration. The 2500R-52J exceeds the minimum current rating requirement (61 mA vs. 53 mA) and provides lower DC resistance (38Ohm vs. 51.6Ohm), making it functionally compatible.
Q: What is the difference between the B78108S1335J000 and the original 70F333AI-RC? A: Both maintain 3.3 mH inductance and ±5% tolerance. The B78108S1335J000 uses ferrite core material versus the iron core of the 70F333AI-RC, resulting in different Q factors (40 vs. 52 @ test frequency) and self-resonant frequencies (900kHz vs. 800kHz). DC resistance is slightly higher (59.5Ohm vs. 51.6Ohm). Current rating is higher (62 mA vs. 53 mA).
Q: Are there packaging differences between these parts? A: Yes. The 70F333AI-RC is supplied as individual components. The 2500R-52J is available in Tape & Reel packaging, and the B78108S1335J000 is supplied in Cut Tape packaging. Verify packaging compatibility with assembly equipment and procurement workflows.
Q: Do all substitute parts meet RoHS requirements? A: All three parts are ROHS3 compliant. However, the B78108S1335J000 has REACH affected status, while the 70F333AI-RC and 2500R-52J are REACH unaffected. Applications subject to REACH regulations must account for this distinction.
Q: Which substitute has the lowest DC resistance? A: The 2500R-52J has the lowest DC resistance at 38Ohm Max, compared to 51.6Ohm Max for the 70F333AI-RC and 59.5Ohm Max for the B78108S1335J000. Lower DC resistance reduces power dissipation in current-limited applications.
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