Hammond 157Q 3.5H 150mA DC Reactor, Open Channel Frame
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Create Free Business AccountKey Features
- 3.5H ±15% inductance at rated 150 mA DC current
- 98 ohm ±15% DC resistance; 400 VDC maximum operating voltage
- Open-bracket channel mount, mounting style C9H (A 3.25 in x C 2.00 in)
- Vacuum impregnated with polyurethane varnish for quiet operation and long life
- Every unit Hipot tested (100%) at 1,500 VAC; leads minimum 5 in long
- RoHS and REACH compliant
The 157Q is a 3.5 henry DC reactor rated for 150 mA DC and 400 VDC maximum operating voltage, suited to power supply designers who need more current capacity than the 100 mA parts in the same frame.
Its 98 ohm DC resistance keeps the voltage drop modest at rated current, and the C9H mounting style shares its footprint with other 157-prefix chokes such as the 157M and 157R.
Electrically, the 157Q is specified at 3.5H ±15% with its inductance measured at the rated 150 mA DC. DC resistance is 98 ohms ±15% and the maximum operating voltage is 400 VDC. As with every choke in the 153-159 Series, it will show less inductance at slightly higher currents and more inductance at lower currents, so size it to the actual load current.
Construction follows the series' economical open-bracket channel mount, with leads at least 5 in long. Units are vacuum impregnated with polyurethane varnish for quiet operation and long life, and every unit is Hipot tested (100%) at 1,500 VAC.
Mechanically it uses mounting style C9H: the series table lists A 3.25 in, B 1.75 in, C 2.00 in and D 2.81 in with a 0.19 in mounting hole. Weight is 1 lb in the series table and 1 lbs (0.45 kg) shipping weight. The part is RoHS and REACH compliant (UNSPSC 39121301, UPC 623980203706).
Ideal For
- High voltage power supply filtering
- DC reactor for supply rails up to 400 VDC at 150 mA
- Open-bracket channel mounting in equipment chassis
- Replacement filter choke for existing 157Q designs
Overview
| Series | 153-159 Series D.C. Reactors or Filter Chokes (low to medium current) |
| Description | DC reactor, filter choke, open channel mount, inductance 3.5H, DC current 150 ma. |
| Part Number | 157Q |
| Short Description | CHOKE |
Dimensions
| Mounting Style (Dim. Ref.) | C9H |
| Mounting Hole (Series Table) | 0.19 in |
| Dimension A (Part Data Sheet) | 3.25" / 82.6 mm |
| Dimension B (Part Data Sheet) | 1.75" / 44.5 mm |
| Dimension C (Part Data Sheet) | 2" / 50.8 mm |
| Dimension D (Part Data Sheet) | 2.81" / 71.4 mm |
| Dimension A (C9H Series Table) | 3.25 in |
| Dimension B (C9H Series Table) | 1.75 in |
| Dimension C (C9H Series Table) | 2.00 in |
| Dimension D (C9H Series Table) | 2.81 in |
| Mounting Hole G (Part Data Sheet) | 0.19" / 4.8 mm |
Electrical
| Inductance (±15%) | 3.5H |
| Resistance (±15%) | 98 ohms |
| Hipot Test (Series) | Every unit Hipot tested (100%) at 1,500 VAC |
| DC Current (Rated) | 150 ma. |
| Inductance Measurement | Measured at rated D.C. current |
| Inductance Vs. Current | Less inductance at slightly higher currents, more inductance at lower currents |
| Maximum Operating Voltage DC | 400 VDC |
| Inductance & Resistance Tolerance | 15% |
Identifiers
| UPC | 623980203706 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 1 lbs (0.45 kg) |
| Weight (Series Table) | 1 lbs |
| Weight (Part Data Sheet) | 1 lbs / 0.45 kg |
Construction & Finish
| Leads | Minimum 5" long |
| Mounting | Economical "open bracket" channel mount |
| Impregnation | Vacuum impregnated with polyurethane varnish for quiet operation and long life |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What are the inductance and current ratings of the 157Q?▾
The 157Q is rated 3.5H ±15% at 150 mA DC, and its inductance is measured at that rated DC current.
What voltage can the 157Q be used at?▾
The listed maximum operating voltage is 400 VDC.
How is the choke mounted?▾
It uses an economical open-bracket channel mount in mounting style C9H, with a 0.19 in mounting hole per the series mechanical table.
What happens if my circuit draws more or less than 150 mA?▾
Per the manufacturer, units exhibit less inductance at slightly higher currents and more inductance at lower currents.
Is the 157Q RoHS compliant?▾
Yes. It is listed as both RoHS and REACH compliant.
How much does the 157Q weigh?▾
The series table lists 1 lb and the shipping weight is 1 lbs (0.45 kg).
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