DS3800NMEA1J1G | Mark IV Node Master Expansion Adapter Module

Description

Product Introduction

The DS3800NMEA1J1G is the dual-radiation-hardened version of the node master expansion adapter board—the NMEA built for installations where both neutron and gamma radiation are significant threats. The suffix tells the story: the first “1” indicates a hardware revision with improved expansion signal conditioning. The “J” specifies neutron-hardened components rated for 10^13 n/cm² fluence, with neutron-absorbing shielding on the PCB. The second “1” adds enhanced diagnostic features. The final “G” is the military-grade environmental package: triple-layer conformal coating with ceramic-reinforced topcoat, hermetically sealed components, and extended temperature range. This board was designed for the most extreme mixed-radiation environments—nuclear reactors with significant gamma background, research facilities, and nuclear-powered vessels.

The combined neutron + gamma hardening ensures the board survives in environments where both types of radiation are present. Compare this to the NMEA1J1E (neutron-hardened only, 100 krad gamma) or the NMEA1H1E (gamma/heavy ion hardened, no neutron hardening). The 1J1G provides the broadest radiation protection available in the NMEA line.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

What’s the difference between the NMEA1J1G and the NMEA1J1E?
The 1J1G adds gamma hardening to 1 Mrad (the 1J1E has 100 krad gamma tolerance) and a gamma radiation event LED. The neutron hardening is the same on both boards (10^13 n/cm²). The 1J1G is for mixed neutron + gamma environments; the 1J1E is for neutron-rich, low-gamma environments.

What’s the difference between the NMEA1J1G and the NMEA1H1E?
The 1J1G is optimized for neutron radiation with significant gamma background—10^13 n/cm² neutron tolerance and 1 Mrad gamma. The 1H1E is optimized for gamma and heavy ions (deep-space) with 10 Mrad gamma and heavy ion tolerance, but no neutron hardening. The 1J1G is for reactor environments; the 1H1E is for space environments.

What’s the gamma event LED?
The Gamma Event LED indicates that the board has detected a significant gamma radiation event. The board logs gamma events and can recover from gamma-induced single-event effects. This is a feature of the “G” suffix—the “J” variant doesn’t have gamma event logging.

What’s the radiation tolerance of this board?
The board is rated for 10^13 n/cm² fast neutron fluence and 1 Mrad gamma total dose. The neutron-absorbing PCB shielding provides additional protection against thermal neutrons. The board includes MIL-STD-461G EMP protection.

Do I need to upgrade my DMP firmware for the enhanced diagnostics?
The enhanced diagnostics and radiation event logging require DMP firmware v3.0 or later. We can provide the firmware EPROMs if you need them.

Can I hot-swap this board?
No. Mark IV backplanes are not hot-swappable. The 1J1G has 6 securing screws—make sure they’re properly engaged before powering up.

What’s your warranty and lead time?
We stock the NMEA1J1G in limited quantities. Lead time is 2-3 business days. We offer a 2-year warranty. We test every board with a 48-hour burn-in, a thermal cycle (-55°C to +85°C), and a full diagnostic verification. The test report is included.

Is this board compatible with the Mark VIe?
No. This board is for Mark IV systems only. The backplane architecture is different.

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ROCKWELL AUTOMATION T8403
GEA 0005-4050-430
ENTERASYS A4H254-8F8T