S16503G Ethernet LAN Transformer For 10/100BASE-TX SMD Package
S16503G LAN Magnetic Isolation Transformer engineered for Fast Ethernet (10/100BASE-TX) applications. Featuring a 1:1 turns ratio, low insertion loss, robust 1500VAC isolation, and strong crosstalk/common mode rejection, S16503G ensures stable, noise-resilient Ethernet PHY interface performance. Its compact SMD package and industry-standard electrical characteristics make it ideal for RJ45 network ports, Ethernet switches, routers, industrial IoT gateways, and communication infrastructure boards. Available from trusted sources including EASTEVER, JWD, and CND-tek with global distribution and reel packaging for high-volume assembly. Designed for IEEE 802.3 compliant networks and optimized for modern PCB assembly workflows.
Key Electrical Specifications (Typical @ 25 °C)
| Parameter | Specification |
|---|---|
| Model Number | S16503G |
| Product Type | Ethernet LAN Magnetics / Isolation Transformer |
| Supported Ethernet Standard | IEEE 802.3 10/100BASE-TX |
| Turns Ratio (Tx / Rx) | 1CT : 1CT ±5% |
| Open Circuit Inductance (OCL) | ≥ 350 µH @ 100 kHz, 0.1 V, 8 mA DC bias |
| Leakage Inductance | ≤ 0.5 µH @ 100 kHz, 0.1 V |
| DC Resistance (DCR) | ≤ 1.4 Ω |
| Insertion Loss | ≤ -1.1 dB @ 1–100 MHz |
| Return Loss | ≥ -18 dB (1–30 MHz)≥ -12 dB (30–80 MHz) |
| Crosstalk | ≥ -30 dB @ 1–100 MHz |
| Common Mode Rejection (CMR) | ≥ -30 dB @ 1–100 MHz |
| Isolation Voltage (Hi-Pot) | 1500 VAC, 60 s, 1 mA |
| Operating Temperature Range | 0 °C to +70 °C |
| Storage Temperature Range | -20 °C to +125 °C |
| Mounting Type | Surface Mount Device (SMD) |
| Compliance | RoHS Compliant |
S16503G Ethernet Transformer Main Functions
- Ethernet Isolation: Provides galvanic isolation between Ethernet PHY and external network cables, ensuring safety and signal integrity.
- Impedance Matching & EMI Control: Balanced transformer design delivers low insertion loss and high return/crosstalk performance for stable data transmission.
- Compact & SMT-Ready: Low-profile SMD package simplifies PCB layout in high-density network products.
- Standards Compliance: Designed for IEEE 802.3 compatible networks (Fast Ethernet).
S16503G Datasheet
Magnetic Isolation Transformer Typical Use Cases
✅ Ethernet Network Equipment: Switches, routers, firewalls
✅ Embedded Systems: SBCs, industrial controllers
✅ Consumer & Surveillance Devices: IP cameras, smart TVs, set-top boxes
✅ Telecom & Communication Gear: EPON/GPON terminals, base station microcells
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