Hammond 157L 14H 75mA Filter Choke, 400VDC Open Channel Mount
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Create Free Business AccountKey Features
- 14H ±15% inductance at rated 75 mA DC current
- 429 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
- Class B (130°C) insulation; operating temperature -40°C to 105°C
- Every unit Hipot tested (100%) at 1,500 VAC; leads minimum 5 in long
- RoHS and REACH compliant
The 157L is a 14 henry DC reactor (filter choke) rated for 75 mA DC, built for engineers and technicians designing or repairing high voltage power supply filter stages.
Its engineering drawing is a recent release (Rev. 0, 01/15/26) and adds detail the catalogue table does not: a 100 V, 60 Hz inductance test at 75 mA DC, a measured DCR of 426.5 ohms, and a 0.030 in channel frame.
Electrically, the 157L is specified at 14H ±15% with its inductance measured at the rated 75 mA DC. DC resistance is 429 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. The part drawing adds class B (130°C) insulation, black leads, an operating temperature of -40°C to 105°C and storage from -40°C to 85°C.
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 623980203508).
Ideal For
- High voltage power supply filtering
- DC reactor for supply rails up to 400 VDC at 75 mA
- Open-bracket channel mounting in equipment chassis
- Replacement filter choke for existing 157L 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 14H, DC current 75 ma. |
| Part Number | 157L |
| Short Description | CHOKE |
Dimensions
| Dimension A (Part Drawing) | 3.250" ±0.063 |
| Dimension B (Part Drawing) | 1.615" ±0.125 |
| Dimension C (Part Drawing) | 1.995" ±0.063 |
| Dimension D (Part Drawing) | 2.813" ±0.063 |
| Mounting Style (Dim. Ref.) | C9H |
| Mounting Hole (Series Table) | 0.19 in |
| 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 Drawing) | 0.187" ±0.015 |
Electrical
| DCR (Drawing) | 426.5 Ω ±15% @ 20°C, BLK - BLK |
| Hipot (Drawing) | 2500V, 60Hz, 1 sec (primary - secondary) |
| Inductance (±15%) | 14H |
| Resistance (±15%) | 429 ohms |
| Hipot Test (Series) | Every unit Hipot tested (100%) at 1,500 VAC |
| DC Current (Rated) | 75 ma. |
| Inductance Measurement | Measured at rated D.C. current |
| Inductance Vs. Current | Less inductance at slightly higher currents, more inductance at lower currents |
| Label Marking (Drawing) | 14H ±15%, 75mA DC, 500VDC MAX. Op. |
| Inductance Test (Drawing) | @ 100V, 60Hz, 75mA DC, BLK - BLK: 14H ±15% |
| Maximum Operating Voltage DC | 400 VDC |
| Inductance & Resistance Tolerance | 15% |
Identifiers
| UPC | 623980203508 |
| UNSPSC | 39121301 |
| Drawing Revision | Rev. 0, released 01/15/26 |
Packaging & Shipping
| Shipping Weight | 1 lbs (0.45 kg) |
| Weight (Part Drawing) | 1.00 lbs |
| Weight (Series Table) | 1 lbs |
Construction & Finish
| Leads | Minimum 5" long |
| Mounting | Economical "open bracket" channel mount |
| Insulation | Class B (130°C) insulation |
| Impregnation | Vacuum impregnated with polyurethane varnish for quiet operation and long life |
| Channel Frame Thickness | 0.030" |
Environmental & Protection
| Storage Temperature | -40°C to 85°C |
| Operating Temperature | -40°C to 105°C |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
| Drawing Compliance Note | RoHS & REACH Compliant |
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Frequently Asked Questions
What are the inductance and current ratings of the 157L?▾
The 157L is rated 14H ±15% at 75 mA DC, and its inductance is measured at that rated DC current.
What voltage can the 157L be used at?▾
The listed maximum operating voltage is 400 VDC. Its part drawing label reads 500VDC MAX. Op..
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 75 mA?▾
Per the manufacturer, units exhibit less inductance at slightly higher currents and more inductance at lower currents.
Is the 157L RoHS compliant?▾
Yes. It is listed as both RoHS and REACH compliant.
What temperatures is the 157L rated for?▾
The part drawing gives an operating temperature of -40°C to 105°C and a storage temperature of -40°C to 85°C, with class B (130°C) insulation.
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