Hammond 193NP 3H 500mA Potted DC Filter Choke, 800VDC
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Create Free Business AccountKey Features
- 3 H inductance at 500 mA rated DC current
- 36 ohm resistance; 800 VDC maximum operating voltage
- Epoxy potted black powder paint drawn steel housing, P1 style, 1/4"-20 hardware included
- Vacuum impregnated with polyurethane varnish for quiet, long-life operation
- 15% tolerance on inductance and resistance; inductance measured at rated DC
- Minimum 8 in long leads
- Insulation class 105C; operating range -40C to 65C
- RoHS and REACH compliant
The Hammond 193NP is a D.C. filter choke from the 193 Series of enclosed and potted chassis mount chokes, rated 3 henries at 500 mA DC. It is designed for high voltage power supply filtering, and is a natural fit for tube amplifier builders, audio equipment restorers and OEM engineers designing linear DC supplies.
The 193NP is the potted version of the 193N: 3 henries at 500 mA with 36 ohms resistance, and a higher 800 VDC maximum operating voltage than the enclosed model's 600 VDC.
As a potted model, the 193NP is epoxy potted in a black powder paint drawn steel housing and mounts with 1/4"-20 hardware, which is included. It uses the P1 mounting style, with Dimension A 3.31 in, B 3.88 in and C 4.25 in. Like every 193 Series unit it is vacuum impregnated with polyurethane varnish for quiet, long-life operation and has minimum 8 in long leads.
Electrically, the 193NP has a resistance of 36 ohms and a maximum operating voltage of 800 VDC. Inductance is measured at rated D.C. current, with a tolerance of 15% on both inductance and resistance; the unit will exhibit less inductance at slightly higher currents and more at lower currents. Insulation class is 105C and the operating temperature range is -40C to 65C. The part is RoHS and REACH compliant.
The series table lists a weight of 7 lbs, and the shipping weight is 5 lbs (2.27 kg).
Ideal For
- High voltage power supply filtering
- Tube audio equipment power supplies
- Tube audio equipment matching Hammond power and output transformer cases
- Chassis mount DC filter in linear power supplies
Mounting
| Mounting Type | Potted chassis mount, 1/4"-20 hardware (included) |
| Mounting Style (Dimension Ref.) | P1 |
Overview
| Style | Potted |
| Series | 193 Series (Enclosed & Potted Chassis Mount) |
| Product Type | D.C. Filter Choke |
| Long Description | DC Filter Choke, Potted chassis mount, inductance 3H @ 500mA, 193 Series |
| Short Description | CHOKE 3H @ 500mA DC POTTED |
Dimensions
| Dimension A | 3.31 in |
| Dimension B | 3.88 in |
| Dimension C | 4.25 in |
Electrical
| Tolerance | 15% on both inductance and resistance |
| Inductance | 3H |
| Resistance | 36 Ohms |
| DC Current | 500 mA |
| Insulation Class | 105C |
| Inductance Measurement | Measured at rated D.C. current |
| Maximum Operating Voltage | 800 VDC |
Identifiers
| UPC | 623980252216 |
| UNSPSC | 39121301 |
| Part Number | 193NP |
Packaging & Shipping
| Shipping Weight | 5 lbs (2.27 kg) |
| Weight (Series Table) | 7 lbs |
Construction & Finish
| Housing | Epoxy potted, black powder paint drawn steel housing |
| Lead Length | Minimum 8 in |
| Impregnation | Vacuum impregnated with polyurethane varnish |
Environmental & Protection
| Operating Temperature Range | -40C to 65C |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What are the inductance and current ratings of the 193NP?▾
The 193NP is rated 3H at 500 mA DC, with inductance measured at rated D.C. current and a 15% tolerance on inductance and resistance.
What is the maximum operating voltage of the 193NP?▾
800 VDC maximum operating voltage.
How is the 193NP mounted?▾
It is a potted model in the P1 style and mounts with 1/4"-20 hardware, which is included.
Why does my measured inductance differ from the rating?▾
Inductance is specified at rated D.C. current; units exhibit less inductance at slightly higher currents or more at lower currents. The manufacturer notes that proper henry testing requires an LCR meter in junction with a 25A power supply that allows DC bias and a higher applied AC drive voltage.
What temperature and insulation ratings does the 193NP have?▾
Insulation class is 105C and the operating temperature range is -40C to 65C.
Are open bracket-mount versions available?▾
For more sizes and voltages in an open, bracket mount type, the manufacturer points to its 153-159 Series.
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