Hammond 1540M25 8000uH High Current Toroid Inductor, 1A Rated
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Create Free Business AccountKey Features
- 8000 uH nominal inductance (Ls +/- 15% at 0 A DC)
- Rated DC current of 1 A with minimum 4500 uH at rated current
- Maximum DC resistance of 3.34 ohms
- Holds 0.8 Ls up to 0.7 A DC
- Toroid construction for EMI/RFI filtering and switching power supply energy storage
- Minimum 0.5 in long leads for P.C. board mounting
- Operating -20°C to 85°C; storage -20°C to 105°C
- RoHS and REACH compliant
The Hammond 1540M25 is a high current toroid inductor from the 1540 Series, listed by the manufacturer as an RF choke and heavy duty hash choke. It is intended for EMI/RFI filtering and as an energy storage inductor in switching power supplies, making it relevant to power electronics designers, OEM engineers and repair technicians working on DC supply rails.
The 1540M25 carries the highest inductance in the whole 1540 series at 8000 uH (8 mH) nominal. It is rated for 1 A DC, with a maximum DC resistance of 3.34 ohms, and suits lower-current lines where a large inductance value matters most. At its 1 A rating the inductance is no less than 4500 uH, and it retains 0.8 of the zero-bias value up to 0.7 A DC. Inductance is specified as Ls +/- 15% at 0 A DC.
Physically, the 1540M25 has a maximum A dimension of 2.12 in (54 mm), a maximum B dimension of 0.94 in (24 mm) and a minimum C dimension of 0.62 in (16 mm), with a typical lead diameter of 0.01 in (0 mm). Leads are a minimum of 0.5 in long for P.C. board mounting, and the shipping weight is 0.4 lbs (0.18 kg).
The part is rated for an operating temperature range of -20°C to 85°C and a storage range of -20°C to 105°C. It is RoHS compliant and REACH compliant.
Ideal For
- EMI/RFI filtering
- Energy storage inductor in switching power supplies
- Hash choke on DC supply lines
- P.C. board mounted filter circuits
Overview
| Series | 1540 Series |
| Product Type | High Current Toroid Inductor |
| Long Description | RF Choke, heavy duty hash choke, inductance 8000uH, DC current 0.7A, 1540 series |
| Short Description | 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) |
| Typical Lead Diameter | 0.01 in (0 mm) |
Electrical
| Rated DC Current | 1 A |
| DC Resistance Max | 3.34 Ohms |
| DC Amps For 0.8 Ls | 0.7 A |
| Inductance Ls +/- 15% @ 0A DC | 8000 uH |
| Minimum Inductance At Rated DC | 4500 uH |
Identifiers
| UPC | 623980201177 |
| UNSPSC | 39121301 |
| Part Number | 1540M25 |
Packaging & Shipping
| Shipping Weight | 0.4 lbs (0.18 kg) |
Construction & Finish
| Core Type | Toroid |
| Lead Length | Minimum 0.5 in, for P.C. board mounting |
Environmental & Protection
| Storage Temperature Range | -20°C to 105°C |
| Operating Temperature Range | -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 1540M25?▾
8000 uH, specified as Ls +/- 15% at 0 A DC. At its rated 1 A DC current the minimum inductance is 4500 uH.
How much DC current can the 1540M25 carry?▾
It is rated for 1 A DC. The data also lists 0.7 A as the DC current at which the inductance is 0.8 of Ls.
What is the DC resistance of the 1540M25?▾
The maximum DC resistance is 3.34 ohms.
Is the 1540M25 suitable for PC board mounting?▾
Yes. The 1540 Series has minimum 0.5 in long leads for P.C. board mounting; the 1540M25 has a typical lead diameter of 0.01 in (0 mm).
What temperatures is the 1540M25 rated for?▾
Operating temperature range is -20°C to 85°C and storage temperature range is -20°C to 105°C.
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