Hammond 166J18 18 VA 18V CT 1A 115V 50/60Hz Power Transformer
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Create Free Business AccountKey Features
- 18 VA rating: 18 VAC center-tapped (C.T.) secondary at 1 A (RMS)
- 115V 50/60 Hz single primary for 50 Hz or 60 Hz supplies
- Open style channel bracket with two-hole chassis mount, 2.81 in (71 mm) hole-to-hole
- Compact 3.25 x 2.00 x 2.00 in overall (A x B x C), 1.3 lbs shipping weight
- Dual bobbin design, no electrostatic shield required; minimum 6 in leads
- Class B (130 °C) insulation, UL listed as a Class A (105 °C) design
- Hi-pot tested at 2,000 V RMS; UL listed, CSA certified, RoHS and REACH compliant
The 166J18 is a low voltage/filament power transformer from the Hammond 166 Series, supplying a 18 VAC center-tapped (C.T.) secondary rated at 1 A for a total of 18 VA from a single 115V 50/60 Hz primary. It is intended for designers, OEM engineers and repair technicians who need a compact, open style transformer that bolts straight to a chassis.
The 166J18 is rated for a 115 VAC primary at 50/60 Hz, where most of the 166 Series is specified for 60 Hz only, so it can be used on either line frequency. The secondary is center tapped, giving access to the midpoint of the 18 VAC winding.
Construction is open style with a channel bracket and two-hole chassis mount, and the transformer uses a dual bobbin design, so no electrostatic shield is required. Leads are a minimum of 6 in long. On the drawing schematic the primary leads are black and the secondary leads green, with a green/yellow lead on the center tap. Insulation is Class B (130 °C) for extra protection, while the design is UL listed as Class A (105 °C).
Overall dimensions are 3.25 in (83 mm) (A), 2.00 in (51 mm) (B) and 2.00 in (51 mm) (C), with 2.81 in (71 mm) between mounting holes (D) and 0.19 in (5 mm) mounting holes. The part drawing gives the same measurements more precisely as 3.25 in / 82.6 mm (A), 2 in / 50.8 mm (B) and 2 in / 50.8 mm (C), with 2.81 in / 71.4 mm hole-to-hole spacing and 0.187 in / 4.7 mm width-wise mounting holes. Shipping weight is 1.3 lbs (0.59 kg).
The design carries a hi-pot test of 2,000 V RMS, and the series is UL listed and CSA certified. The 166J18 is also listed as RoHS and REACH compliant.
Ideal For
- Low voltage 18 VAC supply for chassis-mounted electronic equipment
- Filament supply transformer at 1 A
- Circuits needing a center-tapped 18 VAC secondary
- Equipment operating on 115V 50/60 Hz mains
- Replacement or OEM power transformer for 18 VA loads
Overview
| Series | 166 Series - Economical Single Primary, Open Style Chassis Mount |
| Description | Power transformer, low voltage, 115V 50/60 Hz., 18VA, 18 C.T., 1A |
| Product Type | Power transformer, low voltage/filament |
| Short Description | POWER TX 115VAC - 18VCT@ 1 A |
Dimensions
| Mounting Hole Size | 0.19 in (5 mm); drawing width-wise 0.187 in / 4.7 mm |
| Mounting Reference | C |
| Overall Dimension A | 3.25 in (83 mm); drawing 3.25 in / 82.6 mm |
| Overall Dimension B | 2.00 in (51 mm); drawing 2 in / 50.8 mm |
| Overall Dimension C | 2.00 in (51 mm); drawing 2 in / 50.8 mm |
| Hole-to-Hole Mounting Dimension (D) | 2.81 in (71 mm); drawing 2.81 in / 71.4 mm |
Electrical
| Hi-Pot Test | 2,000 V RMS |
| Power Rating | 18 VA |
| Primary Voltage | 115V 50/60 Hz. |
| Secondary Current (RMS) | 1 A |
| Secondary Voltage (RMS) | 18 C.T. VAC |
Identifiers
| UPC | 623980036786 |
| UNSPSC | 39121301 |
| Part Number | 166J18 |
Packaging & Shipping
| Shipping Weight | 1.3 lbs (0.59 kg) |
Construction & Finish
| Style | Open style, channel bracket |
| Mounting | Two-hole chassis mount |
| Lead Length | Minimum 6 in |
| Bobbin Design | Dual bobbin - no electrostatic shield required |
| Insulation Class | Class B (130 °C); UL listed as a Class A (105 °C) design |
Compliance & Certifications
| UL | UL listed |
| CSA | CSA certified |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What are the input and output ratings of the 166J18?▾
The 166J18 has a 115V 50/60 Hz primary and a 18 VAC center-tapped (C.T.) secondary rated at 1 A RMS, for a power rating of 18 VA.
Does the 166J18 have a center-tapped secondary?▾
Yes. The secondary is listed as 18 C.T., meaning it is center tapped; the drawing schematic shows the center tap on a green/yellow lead.
Can the 166J18 be used on 50 Hz power?▾
Yes. Its primary is rated 115V 50/60 Hz, so it is specified for both 50 Hz and 60 Hz supplies.
How is the 166J18 mounted and how big is it?▾
It is an open style transformer with a channel bracket and two-hole chassis mount. Overall dimensions are 3.25 in (83 mm) (A) x 2.00 in (51 mm) (B) x 2.00 in (51 mm) (C), with 2.81 in (71 mm) between the 0.19 in (5 mm) mounting holes.
What safety testing and approvals apply to the 166J18?▾
It is hi-pot tested at 2,000 V RMS, uses Class B (130 °C) insulation and is UL listed as a Class A (105 °C) design. The series is UL listed and CSA certified, and this part is RoHS and REACH compliant.
How much does the 166J18 weigh?▾
The shipping weight is 1.3 lbs (0.59 kg).
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