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Product Detailed Parameters
- Description：AUDIO XFMR 7.5KCT / 12 TH
- Series：Red-Spec
- Mfr：Triad Magnetics
- Package：Bulk
- Mounting Type：Through Hole
- Size / Dimension：0.410" L x 0.310" W (10.41mm x 7.87mm)
- Height - Seated (Max)：0.465" (11.80mm)
- Termination Style：PC Pin
- Turns Ratio - Primary:Secondary：25:01:00
- Impedance - Primary (Ohms)：7.5kCT
- Impedance - Secondary (Ohms)：12
- DC Resistance (DCR) - Primary：796Ohm
- DC Resistance (DCR) - Secondary：2.9Ohm
- Transformer Type：Audio Coupling
- Frequency Range：300Hz ~ 100kHz
- Frequency Response：±2dB
- Voltage - Isolation：1000VRMS @ 1 Second
- Insertion Loss：-
- Return Loss：-
- Power Level：50mW
- Operating Temperature：-40°C ~ 85°C
- Approval Agency：-
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Overview
The Triad Magnetics SP-48 is an encapsulated audio coupling transformer designed for through-hole mounting. It features a primary impedance of 7.5kCT and a secondary impedance of 12 Ohms, with a turns ratio of 25:1. The device operates within a frequency range of 300Hz to 100kHz and maintains a frequency response of ±2dB. Electrical characteristics include a primary DC resistance of 796 Ohms and a secondary DC resistance of 2.9 Ohms. It supports a power level of 50mW and provides 1000VRMS isolation at 1 second. The unit measures 0.410 inches in length, 0.310 inches in width, and has a maximum installation height of 0.465 inches.
Feature Summary
- Epoxy molded encapsulation for mechanical protection
- Gold-plated leads for reliable connectivity
- Wide frequency operation from 300 Hz to 100 kHz
- High voltage isolation capability
Applications
- Audio signal coupling circuits
- Impedance matching in audio equipment
- Signal transmission stages requiring isolation
Procurement Notes
Verify the specific datasheet version when sourcing, as manufacturing revisions may occur. Confirm that the through-hole package dimensions align with your PCB layout constraints. Ensure the 7.5kCT primary impedance specification matches the source circuit requirements. Check RoHS compliance status if environmental regulations apply to your assembly process.
Selection Notes
Select this component when a 25:1 turns ratio and 7.5kCT primary impedance are required for audio applications. Consider the 300Hz lower frequency limit; it is unsuitable for sub-bass or DC-coupled signals. The 50mW power rating limits usage to low-level signal processing rather than power delivery. Verify thermal management needs against the 85°C upper operating temperature limit.
Part Context
The SP-48 belongs to Triad Magnetics' Red-Spec series of audio transformers. This series is characterized by high reliability and consistent performance in audio signal paths. The component serves as a passive magnetic interface for transferring audio signals between circuit stages while providing galvanic isolation and impedance transformation.
Replacement Considerations
Direct substitutes should match the 7.5kCT/12 Ohm impedance configuration and 25:1 turns ratio. Verify that alternative components support the same 300Hz-100kHz frequency range and ±2dB response tolerance. Physical footprint compatibility must be confirmed for through-hole PCB integration.
