Hammond 1540M20 4500uH 1.25A High Current Toroid Inductor
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Create Free Business AccountKey Features
- 4500 uH nominal inductance, +/-15% at 0 A DC
- 1.25 A rated DC current with 2700 uH minimum inductance at rated current
- Holds 0.8 Ls at 0.9 A DC
- 2.64 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
1540M20 is a 1540 Series high current toroid inductor with 4500 uH of nominal inductance and a 1.25 A rated DC current. The manufacturer describes it as an RF choke and heavy duty hash choke, and the series is designed for EMI/RFI filtering and energy storage in switching power supplies.
Nominal inductance is 4500 uH +/-15%, measured at 0 A DC. At the rated DC current of 1.25 A, the 1540M20 maintains a minimum inductance of 2700 uH, and it reaches 0.8 Ls (80% of nominal inductance) at 0.9 A DC. Maximum DC resistance is 2.64 ohms, which helps designers estimate copper losses at their operating current.
The part measures 1.81 in (46 mm) maximum for Dimension A and 0.75 in (19 mm) maximum for Dimension B, with a minimum Dimension C of 0.75 in (19 mm). Typical lead diameter is 0.01 in (0 mm), and shipping weight is 0.2 lbs (0.09 kg). Among the 1540 Series parts sharing the 1.81 in Dimension A body, 1540M20 offers the highest inductance and lowest rated current, with that size group spanning 125 to 4500 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 1540M20 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) | 1.81 in (46 mm) |
| Dimension B (Maximum) | 0.75 in (19 mm) |
| Dimension C (Minimum) | 0.75 in (19 mm) |
| Lead Diameter (Typical) | 0.01 in (0 mm) |
Electrical
| Rated DC Current | 1.25 A |
| DC Amps For 0.8 Ls | 0.9 A |
| Inductance Tolerance | +/- 15% |
| DC Resistance (Max) | 2.64 Ohms |
| Minimum Inductance At Rated DC | 2700 uH |
| Inductance Ls (+/- 15%) @ 0 A DC | 4500 uH |
Identifiers
| UPC | 623980201122 |
| UNSPSC | 39121301 |
| Part Number | 1540M20 |
Packaging & Shipping
| Shipping Weight | 0.2 lbs (0.09 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 1540M20?▾
Nominal inductance is 4500 uH +/-15% at 0 A DC, with a minimum of 2700 uH at the rated DC current of 1.25 A.
What is the DC resistance of the 1540M20?▾
Maximum DC resistance is 2.64 ohms.
How is the 1540M20 mounted?▾
It has minimum 0.5 in long leads for P.C. board mounting, with a typical lead diameter of 0.01 in (0 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 1540M20?▾
Dimension A is 1.81 in (46 mm) maximum, Dimension B is 0.75 in (19 mm) maximum and Dimension C is 0.75 in (19 mm) minimum. Shipping weight is 0.2 lbs (0.09 kg).
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