100B-1003X Mil-Aero 10/100Base-TX Single-Port SMT Ethernet Transformer Module

The iNRCORE 100B-1003X is a Mil-Aero-grade single-port 10/100Base-TX Fast Ethernet discrete transformer module in a 16-pin surface-mount (SMT) package (12.95 × 6.98 × 6.22 mm). Designed for mission-critical reliability, it features an extreme operating temperature of -55°C to +125°C, 1500 Vrms dielectric withstanding voltage (DWV), a minimum open circuit inductance (OCL) of 350 µH with 8mA DC bias, and an MSL 3 rating. To eliminate catastrophic tin-whisker growth in flight and defense systems, its default terminal finish is authentic Sn63Pb37 (Tin/Lead) with a peak reflow profile resistance of 235°C. Both TX and RX channels incorporate an internal Choke + Transformer (C, T) topology.

Technical Specifications:

1. Electrical Performance (@ 25°C)

2. Environmental, Material & Assembly Ratings

100B-1003X 10/100 BASE-TX Transformer Module Datasheet:

Key Features of 100B-1003X 16-Pin SMD Ehernet Magnetics:

The 100B-1003X is a ruggedized single-port discrete Ethernet transformer module engineered to deliver mission-critical networking across extreme aerospace, defense, and harsh industrial environments. Fully compliant with IEEE 802.3 10/100Base-TX standards, this 16-pin gull-wing surface-mount module integrates precision 1CT:1CT transmit (TX) and receive (RX) channels, each protected by an internal Common Mode Choke and Transformer (C, T) stage.

Unlike commercial magnetics limited to standard industrial temperatures, the "X" tier is rated for uncompromised continuous operation from -55°C to +125°C. The module is housed in an epoxy-encapsulated package that withstands heavy mechanical shock, continuous vibration, and thermal cycling. To satisfy aerospace anti-tin-whisker mandates (such as GEIA-STD-0005-2), the base 100B-1003X features a dedicated Sn63Pb37 eutectic tin-lead finish, completely mitigating the short-circuit hazards associated with pure-tin plating in unpressurized avionics and tactical battlefield equipment.

• Full Mil-Aero-grade Temperature Range: Rated from -55°C to +125°C, ensuring no magnetic core saturation or inductance collapse across extreme thermal swings.
• DC Bias Inductance Stability: Delivers ≥350 µH OCL with 8mA continuous DC bias applied, preventing baseline wander in high-noise environments.
• Authentic Sn63Pb37 Anti-Whisker Finish: Eliminates microscopic tin-whisker growth in flight-critical electronics (RoHS exempt for defense; "NL" option available for commercial lead-free compliance).
• Enhanced High-Frequency Performance: Achieves 20 dB minimum return loss at 2/30 MHz and 35 dB minimum DM-to-CM rejection up to 100 MHz, outperforming standard 100B-1001 series modules.
• Rugged 16-Pin SMT Package: Measures 12.95 × 6.98 × 6.22 mm; gull-wing leads provide compliant strain relief against PCB CTE mismatch during thermal shock.

100B-1003X Mil-Aero Transformer Assembly Guidelines:

1. Reflow Profile Ceiling (235°C Peak):
   Per the official datasheet, the standard epoxy-encapsulated Sn63Pb37 body withstands a 235°C peak temperature profile (liquidus at 183°C). Do not process base SnPb parts under standard SAC305 lead-free profiles (245°C–260°C), as excess heat can cause internal solder reflow and package delamination.
2. MSL 3 Floor Life & Baking:
   Rated at MSL 3, the module has a floor life of 168 hours at ≤30°C/60% RH. If parts exceed this window or the moisture barrier bag (MBB) seal is compromised, bake according to IPC/JEDEC J-STD-033 prior to reflow.

Other Items Specifications:

Technical FAQ:

Q1: Why does 100B-1003X specify a 1.2 dB max insertion loss compared to 1.0 dB on the standard 100B-1003?

A: The "X" version is qualified over an extended temperature window of -55°C to +125°C (versus -40°C to +85°C for 100B-1003). The slightly higher insertion loss rating (1.2 dB) accounts for the higher thermal resistance and core stability margins required across 180°C of total temperature span.

Q2: Why is Sn63Pb37 preferred over lead-free plating in Mil-Aero-grade hardware?

A: Pure tin (>97% Sn) electroplating can spontaneously grow microscopic conductive whiskers over time, causing intermittent or catastrophic phase-to-phase shorts. Under GEIA-STD-0005-2 and defense procurement rules, Sn63Pb37 is strictly required to prevent tin-whisker growth.

Q3: Can 100B-1003X be used with circular connectors (e.g., MIL-DTL-38999)?

A: Yes. In mission-critical avionics and naval systems, plastic RJ45 jacks are rarely used externally. The 100B-1003X discrete transformer mounts directly onto the PCB, filtering differential lines before they route to a ruggedized chassis-mounted circular D38999 connector.