# 0399\-T208 (Component)

## Description

Flyback Transformer – Surface\-mount transformer for isolated flyback converter applications, with 40 µH primary inductance at 100 kHz and a 1:10:10:10 turns ratio \(Np:Ns1:Ns2:Ns3\)\. It provides 1500 Vrms isolation between primary and secondary windings and 500 Vrms between secondary windings and the core, with a −40°C to \+125°C operating temperature range\.

\#Sumida \#0399T208 \#FlybackTransformer \#SMPS \#PowerTransformer \#DCDCConverter \#PCBComponents

## Component Details

- **Owner:** silicon\-yard
- **Created:** 8/13/2026
- **Last Updated:** 8/13/2026
- **Visibility:** Public
- **Manufacturer Part Number:** 0399\-T208
- **Mount:** Surface Mount
- **Manufacturer Name:** Sumida
- **Part Type:** Transformers
- **Symbol Style:** parametric\-v1
- **Datasheet URL:** https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/9d8e8634ee386a8a6b8cd67b0f6bbb99b169641a1b416f481df067069bf1d900\.pdf

## Distributor Pricing (qty 1)

*Pricing shown for quantity 1. For price breaks and other quantities, open in Flux.*

| Distributor | Unit Price (qty 1) | Stock |
|------------|--------------------|-------|
| [Arrow](https://www.arrow.com/en/products/0399-t208/sumida.html?utm_currency=USD&region=nac) | N/A | N/A |
| [Digi\-Key](https://www.digikey.com/en/products/detail/sumida-america-inc/0399-T208/9960781) | N/A | N/A |
| [LCSC](https://www.lcsc.com/product-detail/C17465892.html) | $12\.3275 | 0 |
| [Mouser](https://www.mouser.com/en/ProductDetail/Sumida/0399-T208?qs=doiCPypUmgEj099YbEhsGw%253D%253D) | $4\.55 | 0 |

- **Part Type:** Transformers
- **Manufacturer:** Sumida
- **MPN:** 0399\-T208
- **Mount Type:** Surface Mount
- **Package / Case Code:** TO
- **Pin Count:** 12
## Pins

| Pin | Name | Type |
|-----|------|------|
| 1 | NC\_1 |  |
| 2 | PRI\_1 |  |
| 3 | NC\_2 |  |
| 4 | NC\_3 |  |
| 5 | PRI\_2 |  |
| 6 | NC\_4 |  |
| 7 | SEC1\_1 |  |
| 8 | SEC1\_2 |  |
| 9 | SEC2\_1 |  |
| 10 | SEC2\_2 |  |
| 11 | SEC3\_1 |  |
| 12 | SEC3\_2 |  |

---

*Generated from [https://flux\.ai/silicon\-yard/0399\-t208](https://flux.ai/silicon-yard/0399-t208)*