Hammond 1540M21 250uH 8A High Current Toroid Inductor
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Create Free Business AccountKey Features
- 250 uH nominal inductance, +/-15% at 0 A DC
- 8 A rated DC current with 125 uH minimum inductance at rated current
- Holds 0.8 Ls at 4.75 A DC
- 0.041 ohm maximum DC resistance
- Toroid construction for EMI/RFI filtering and switching power supply energy storage
- Minimum 0.5 in long leads for P.C. board mounting
- Operating range -20°C to 85°C; storage -20°C to 105°C
- RoHS and REACH compliant
Offering 250 uH at a rated 8 A DC, the 1540M21 is a toroidal RF choke in Hammond's 1540 Series of high current toroid inductors. It suits designers of switching power supplies and filter circuits who need a leaded, board-mounted heavy duty hash choke.
Nominal inductance is 250 uH +/-15%, measured at 0 A DC. At the rated DC current of 8 A, the 1540M21 maintains a minimum inductance of 125 uH, and it reaches 0.8 Ls (80% of nominal inductance) at 4.75 A DC. Maximum DC resistance is 0.041 ohms, which helps designers estimate copper losses at their operating current.
The part measures 2.12 in (54 mm) maximum for Dimension A and 0.94 in (24 mm) maximum for Dimension B, with a minimum Dimension C of 0.62 in (16 mm). Typical lead diameter is 0.06 in (2 mm), and shipping weight is 0.4 lbs (0.18 kg). Among the 1540 Series parts sharing the 2.12 in Dimension A body, 1540M21 offers the lowest inductance and highest rated current, with that size group spanning 250 to 8000 uH.
Leads are a minimum of 0.5 in long for P.C. board mounting. The series is specified for an operating temperature range of -20°C to 85°C and a storage temperature range of -20°C to 105°C. The 1540M21 is RoHS compliant and REACH compliant.
Ideal For
- EMI/RFI filtering
- Energy storage inductors for switching power supplies
- High current DC filter chokes
- P.C. board mounted power circuits
Overview
| Series | 1540 Series |
| Description | Heavy duty hash choke |
| Product Type | High Current Toroid Inductor (RF Choke) |
Dimensions
| Dimension A (Maximum) | 2.12 in (54 mm) |
| Dimension B (Maximum) | 0.94 in (24 mm) |
| Dimension C (Minimum) | 0.62 in (16 mm) |
| Lead Diameter (Typical) | 0.06 in (2 mm) |
Electrical
| Rated DC Current | 8 A |
| DC Amps For 0.8 Ls | 4.75 A |
| Inductance Tolerance | +/- 15% |
| DC Resistance (Max) | 0.041 Ohms |
| Minimum Inductance At Rated DC | 125 uH |
| Inductance Ls (+/- 15%) @ 0 A DC | 250 uH |
Identifiers
| UPC | 623980201139 |
| UNSPSC | 39121301 |
| Part Number | 1540M21 |
Packaging & Shipping
| Shipping Weight | 0.4 lbs (0.18 kg) |
Construction & Finish
| Mounting | P.C. board |
| Core Type | Toroid |
| Lead Length | Minimum 0.5 in |
Environmental & Protection
| Storage Temperature | -20°C to 105°C |
| Operating Temperature | -20°C to 85°C |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What is the inductance of the 1540M21?▾
Nominal inductance is 250 uH +/-15% at 0 A DC, with a minimum of 125 uH at the rated DC current of 8 A.
What is the DC resistance of the 1540M21?▾
Maximum DC resistance is 0.041 ohms.
How is the 1540M21 mounted?▾
It has minimum 0.5 in long leads for P.C. board mounting, with a typical lead diameter of 0.06 in (2 mm).
What temperature range is it rated for?▾
Operating temperature range is -20°C to 85°C and storage temperature range is -20°C to 105°C.
What are the dimensions of the 1540M21?▾
Dimension A is 2.12 in (54 mm) maximum, Dimension B is 0.94 in (24 mm) maximum and Dimension C is 0.62 in (16 mm) minimum. Shipping weight is 0.4 lbs (0.18 kg).
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