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P1173.333NLT Equivalent & Substitute Parts
Part Overview
The P1173.333NLT is a 33 µH shielded wirewound inductor manufactured by Pulse Electronics, rated for 3 A continuous current with a maximum DC resistance of 64.8 mOhm. This surface mount component operates across the temperature range of -40°C to 130°C and is ROHS3 compliant. The part is currently in active production status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductance value and current rating category.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Inductance | 33 | µH |
| Inductance Tolerance | ±20% | - |
| Current Rating | 3 | A |
| Current - Saturation (Isat) | 3 | A |
| DC Resistance (DCR) Maximum | 64.8 | mOhm |
| Shielding | Shielded | - |
| Mounting Type | Surface Mount | - |
| Operating Temperature Range | -40°C to 130°C | - |
| Frequency - Self Resonant | 10 | MHz |
| Inductance Frequency - Test | 100 | kHz |
| RoHS Status | ROHS3 Compliant | - |
| Moisture Sensitivity Level | 1 (Unlimited) | - |
Substitute Part Grouping Explanation
Substitute parts for the P1173.333NLT are classified based on strict electrical and mechanical parameter alignment:
Parametric Equivalent (Direct Substitution): Parts maintaining identical inductance (33 µH), tolerance (±20%), current rating (3 A), DC resistance (64.8 mOhm maximum), shielding type (shielded), and operating temperature range (-40°C to 130°C). Packaging differences (Tape & Reel versus Cut Tape) do not affect electrical performance.
Similar Parts (Application-Dependent Substitution): Parts with 33 µH inductance and ±20% tolerance but with variations in current rating, DC resistance, operating temperature maximum, or core material. These parts are suitable when the application can accommodate the specified parameter differences without performance degradation.
Key parameters determining substitution eligibility:
- Inductance value: 33 µH (fixed requirement)
- Inductance tolerance: ±20% (fixed requirement)
- Shielding: Shielded (fixed requirement)
- Mounting type: Surface Mount (fixed requirement)
- Current rating: 3 A minimum for direct equivalence
- DC resistance: 64.8 mOhm maximum for direct equivalence
- Operating temperature: -40°C minimum and 130°C maximum for direct equivalence
Parameter Comparison
| Part Number | Manufacturer | Inductance (µH) | Tolerance | Current Rating (A) | Isat (A) | DCR Max (mOhm) | Shielding | Temp Range (°C) | SRF (MHz) | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|---|---|---|
| P1173.333NLT | Pulse Electronics | 33 | ±20% | 3 | 3 | 64.8 | Shielded | -40 to 130 | 10 | Active | Tape & Reel |
| P1172.333NLT | Pulse Electronics | 33 | ±20% | 3 | 3 | 64.8 | Shielded | -40 to 130 | 10 | Active | Cut Tape & Digi-Reel |
| 7447714330 | Würth Elektronik | 33 | ±20% | 2.5 | 2.9 | 79 | Shielded | -40 to 125 | 11.1 | Active | Tape & Reel |
| DR127-330-R | Eaton - Electronics Division | 33 | ±20% | 3.23 | 6.22 | 60 | Shielded | -40 to 125 | - | Active | Tape & Reel |
| SLF12575T-330M3R2-PF | TDK Corporation | 33 | ±20% | 3.4 | 3.2 | 47.4 | Shielded | -40 to 105 | - | Not For New Designs | Cut Tape & Digi-Reel |
| SRR1280-330M | Bourns Inc. | 33 | ±20% | 4.6 | 3.3 | 57 | Shielded | -40 to 125 | 9.5 | Active | Cut Tape & Digi-Reel |
Engineering Selection Recommendations
P1172.333NLT (Pulse Electronics): Direct parametric equivalent with identical electrical specifications. Differs only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Active product status. Suitable for direct replacement in all applications where P1173.333NLT is specified.
7447714330 (Würth Elektronik): Active product with ferrite drum core construction. Current rating reduced to 2.5 A and maximum operating temperature limited to 125°C. DC resistance increased to 79 mOhm. Suitable for applications where the 3 A rating is not required and operating temperature does not exceed 125°C.
DR127-330-R (Eaton - Electronics Division): Active product with ferrite drum core construction. Current rating increased to 3.23 A with improved saturation current (6.22 A). DC resistance reduced to 60 mOhm. Maximum operating temperature limited to 125°C. Suitable for applications requiring lower DC resistance or higher current margin.
SLF12575T-330M3R2-PF (TDK Corporation): Not For New Designs status. Current rating increased to 3.4 A with lower DC resistance (47.4 mOhm). Maximum operating temperature limited to 105°C. ROHS3 compliant. Not recommended for new design implementations.
SRR1280-330M (Bourns Inc.): Active product with ferrite drum core construction. Current rating increased to 4.6 A with DC resistance of 57 mOhm. Maximum operating temperature limited to 125°C. Suitable for applications requiring lower DC resistance or higher current margin.
Frequently Asked Questions (FAQ)
Q: Can P1172.333NLT replace P1173.333NLT directly? A: Yes. P1172.333NLT is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both are manufactured by Pulse Electronics and maintain the same inductance, current rating, DC resistance, and operating temperature range.
Q: What is the primary difference between the Pulse Electronics parts and the alternative manufacturers? A: The Pulse Electronics P1173.333NLT and P1172.333NLT are wirewound inductors without specified core material. Alternative manufacturers (Würth Elektronik, Eaton, TDK, Bourns) provide ferrite drum core construction. While all maintain 33 µH inductance and ±20% tolerance, the alternative parts have variations in current rating, DC resistance, and maximum operating temperature.
Q: Can I use 7447714330 in place of P1173.333NLT? A: Conditional substitution. The 7447714330 maintains 33 µH inductance and ±20% tolerance but has a reduced current rating (2.5 A versus 3 A) and increased DC resistance (79 mOhm versus 64.8 mOhm). Use only if your application does not require the full 3 A rating and can tolerate higher DC resistance.
Q: Why is SLF12575T-330M3R2-PF marked as "Not For New Designs"? A: This TDK part carries a "Not For New Designs" status, indicating it is in end-of-life phase. While electrically suitable for some applications, it should not be selected for new product designs. Use active alternatives such as SRR1280-330M or DR127-330-R instead.
Q: What is the impact of operating temperature differences? A: P1173.333NLT operates to 130°C maximum. Alternative parts from Würth Elektronik, Eaton, TDK, and Bourns are limited to 125°C maximum (SLF12575T-330M3R2-PF limited to 105°C). If your application requires operation above 125°C, use P1173.333NLT or P1172.333NLT.
Q: How do DC resistance differences affect circuit performance? A: DC resistance directly impacts power dissipation and voltage drop across the inductor. P1173.333NLT specifies 64.8 mOhm maximum. Lower DCR alternatives (DR127-330-R at 60 mOhm, SLF12575T-330M3R2-PF at 47.4 mOhm, SRR1280-330M at 57 mOhm) reduce power loss. Higher DCR alternatives (7447714330 at 79 mOhm) increase power dissipation. Select based on thermal and efficiency requirements.
Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory requirements of P1173.333NLT.
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