Hammond 166D25 2.5VA 25V Center-Tapped Transformer, 100mA
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Create Free Business AccountKey Features
- Secondary rated 25 C.T. (RMS VAC) at 0.1 A
- 2.5 VA power rating from a 115 V, 60 Hz single primary
- Open-style channel bracket for two-hole chassis mounting
- 1.75 in (44.5 mm) hole-to-hole mounting, 0.187 in (4.7 mm) holes
- Dual bobbin design; no electrostatic shield required
- Class B insulation (130 degrees C); UL listed as a Class A (105 degrees C) design
- Hi-Pot tested at 2,000 V RMS; minimum 6 in long leads
- UL listed and CSA certified; RoHS and REACH compliant
The 166D25 steps a 115 V, 60 Hz single primary down to 25 V C.T. at 0.1 A (100 mA), for a 2.5 VA rating. It is a small open-style part for 25 V class control and signal circuits in OEM and repair work.
As a 166 Series part it uses an economical single-primary design, an open-style channel bracket for two-hole chassis mounting, and minimum 6 in long leads. The dual bobbin construction means no electrostatic shield is required. Windings use Class B insulation (130 degrees C) for extra protection, although the design is UL listed as a Class A (105 degrees C) design, and each unit is Hi-Pot tested at 2,000 V RMS. The 166D25 drawing shows black primary leads and green secondary leads with a green/yellow lead on the secondary side.
Its overall dimensions are 2.06 in (52.3 mm) by 1.38 in (35.1 mm) by 1.19 in (30.2 mm), with 1.75 in (44.5 mm) between mounting holes and 0.187 in (4.7 mm) holes. Shipping weight is 0.3 lbs (0.14 kg).
- Power rating: 2.5 VA
- Primary: 115 V, 60 Hz
- Secondary: 25 C.T. (RMS VAC) at 0.1 A
- Shipping weight: 0.3 lbs (0.14 kg)
The 166 Series is UL listed and CSA certified, and the 166D25 is listed as RoHS and REACH compliant. Identifiers include UPC 623980230603 and UNSPSC 39121301.
Ideal For
- 25 V C.T. low-current supplies
- Low-voltage filament and indicator supplies
- Small power supplies for 115 V, 60 Hz equipment
- Center-tapped secondary circuits
Mounting
| Mounting Ref | C |
| Mounting Style | Open style, channel bracket, two hole chassis mount |
| Mounting Dimension | 0.19 in (5 mm) |
| Mounting Hole Size (Width-wise) | 0.187 in / 4.7 mm |
Overview
| Series | 166 Series - Low Voltage/Filament, Economical Single Primary, Open Style Chassis Mount (0.63 VA to 288 VA) |
| Product Type | Power transformer, low voltage, 115V 60 Hz., 2.5VA, 25 C.T., 0.1A |
| Short Description | POWER TX 115VAC - 25V@.1A |
Dimensions
| Drawing Dimension A | 2.06 in / 52.3 mm |
| Drawing Dimension B | 1.38 in / 35.1 mm |
| Drawing Dimension C | 1.19 in / 30.2 mm |
| Overall Dimension A | 2.06 in (52 mm) |
| Overall Dimension B | 1.38 in (35 mm) |
| Overall Dimension C | 1.19 in (30 mm) |
| Drawing Dimension D (Hole-to-Hole Mounting) | 1.75 in / 44.5 mm |
| Overall Dimension D (Hole-to-Hole Mounting) | 1.75 in (44 mm) |
Electrical
| Primary | 115V 60 Hz., single primary |
| Insulation | Class B (130 degrees C); UL listed as a Class A (105 degrees C) design |
| Hi-Pot Test | 2,000V RMS |
| Power Rating | 2.5 VA |
| Winding Design | Dual bobbin - no electrostatic shield required |
| Secondary Current (RMS) | 0.1 A |
| Secondary Voltage (RMS VAC | 25 C.T. |
Identifiers
| UPC | 623980230603 |
| UNSPSC | 39121301 |
| Part Number | 166D25 |
Packaging & Shipping
| Shipping Weight | 0.3 lbs (0.14 kg) |
Construction & Finish
| Leads | Minimum 6" long leads |
| Style | Open style |
| Lead Colours (Schematic) | Primary: Blk / Blk; Secondary: Grn / Grn with Grn/Yel |
Compliance & Certifications
| UL | UL listed |
| CSA | CSA certified |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What is the 166D25 rated for?▾
The 166D25 is rated 2.5 VA with a 25 V C.T. secondary at 0.1 A and a 115 V, 60 Hz primary.
What primary voltage does the 166D25 use?▾
The 166D25 has a single 115 V, 60 Hz primary.
How is the 166D25 mounted?▾
It is an open-style transformer with a channel bracket for two-hole chassis mounting; the drawing lists 1.75 in (44.5 mm) hole-to-hole spacing and 0.187 in (4.7 mm) mounting holes.
What insulation class does the 166D25 use?▾
The 166 Series uses Class B insulation (130 degrees C) for extra protection and is UL listed as a Class A (105 degrees C) design.
Is the 166D25 UL listed and RoHS compliant?▾
Yes. The 166 Series is UL listed and CSA certified, and this part is listed as RoHS and REACH compliant.
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