ST81802 RS Components Transformer (Other) In Stock
The ST81802 is a PCB-mount power transformer rated at 30 VA with dual 15 V AC outputs, designed for through-hole mounting on printed circuit boards to supply regulated power supply circuits in industrial and consumer electronic equipment.
- Manufacturer
- RS Components
- Package
- Other
- Pin Count
- 24
- Lifecycle
- ACTIVE
- Datasheet
- ST81802 Datasheet PDF
- Category
- Transformer
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of ST81802?
- 30 VA power rating with dual 15 V AC secondary outputs enabling symmetrical ±15 V DC supply rails after rectification and filtering
- PCB mount through-hole design allowing direct board integration without external mounting hardware for compact power supply assemblies
- Dual secondary winding configuration supporting center-tapped rectifier topologies for bipolar linear regulator circuits
What is ST81802 used for?
The ST81802 transformer is used in PCB-integrated linear power supply designs where a 30 VA, dual 15 V AC source is needed to produce symmetrical ±15 V or ±12 V DC rails after bridge or full-wave rectification. It is well suited for audio amplifier power stages, analog instrumentation front-ends, and industrial sensor supply boards that require low-noise regulated DC rails. Its direct PCB mount form factor simplifies mechanical integration into chassis-mounted control boards and laboratory equipment.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the ST81802 datasheet?
ST81802 Datasheet DownloadOfficial datasheet from RS Components
What are equivalent replacements for ST81802?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What are the output voltage and power rating specifications of the ST81802 transformer?
The ST81802 provides dual 15 V AC secondary outputs with a total power rating of 30 VA. This makes it suitable for linear power supply designs requiring symmetrical bipolar rails, such as ±15 V DC after rectification. The 30 VA rating supports moderate load currents up to approximately 1 A per secondary winding in continuous operation.
How is the ST81802 mounted, and what board space does it require for PCB integration?
The ST81802 is a PCB mount transformer using through-hole pin terminations, allowing it to be soldered directly onto a printed circuit board without external brackets or chassis hardware. This PCB mount approach reduces assembly complexity and is appropriate for control boards and instrument chassis where the 30 VA transformer must be co-located with rectifier and filter circuits within a compact enclosure.
Which power supply topologies work best with the dual 15 V AC outputs of the ST81802?
The dual 15 V AC windings of the ST81802 are well matched to center-tapped full-wave rectifier and dual bridge rectifier topologies that produce symmetrical ±15 V DC rails. After rectification and filtering with appropriately sized capacitors, linear regulators such as LM7815 and LM7915 can produce regulated ±15 V DC or ±12 V DC rails for analog signal conditioning, audio amplifiers, and op-amp circuits requiring bipolar supply rails.
What industrial or audio applications typically use the ST81802?
The ST81802 is commonly used in benchtop and panel-mount linear power supplies, audio preamplifier stages, analog measurement instruments, and industrial sensor conditioning boards. Its 30 VA capacity and dual 15 V AC outputs are a standard match for powering precision op-amp circuits, data acquisition front-ends, and Class AB audio amplifier output stages that require clean, low-ripple bipolar DC supply rails.
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About RS Components
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