I. Basic Information

Model: MVME162PA-252LSE

Brand: Motorola / Emerson / Abaco

Series: MVME162PA (6U VME SBC, 252 = 2IP + Single Network + SCSI + FPU)

Form: 6U VME dual high single-board computer

Core Features: 25 MHz 68040 (with FPU), 16MB, 2×IP, single Ethernet, with SCSI, -40~+85°C wide temperature range, shock-resistant and vibration-resistant, original factory metal heat sink, standard VME master/slave.

II. Complete Meaning of Suffix (Most frequently asked by customers)

252: 2×IndustryPack, single Ethernet, SCSI, 68040 with FPU, 16MB

L: Reinforcement (strengthened welding, vibration / shock resistance)

S: With original metal heat sink (passive cooling, stable at high temperatures)

E: Wide temperature range (‑40°C ~ +85°C)

Rule: L = Reinforcement, S = Cooling, E = Wide Temperature Range; 252 = 2IP + single network + SCSI + FPU

III. Core Hardware (Consistent across the 252 series, compared with 244 key differences)

CPU: MC68040, 25 MHz (with FPU floating point, 8KB cache + MMU) → 244 is the 68LC040 without FPU

DRAM: 16MB (parity check)

SRAM: 512KB (battery backup, power-off retention)

Flash: 1MB (162Bug firmware)

RTC/NVRAM: 8K×8, battery backup clock

IV. Board-mounted I/O (The biggest difference between 252 vs 244: 2IP / single network / SCSI / FPU)

✅ Single 10Mbps Ethernet (DMA) → 244 is dual networks

✅ 2×Serial ports (EIA‑232‑D: console + user)

✅ 2×IndustryPack (IP) expansion slot (independent DMA) → 244 is 4IP

✅ SCSI interface (32‑bit DMA) → 244 has no SCSI in the entire series

✅ Standard VMEbus A32/D64 (master / slave, system controller)

✅ 6×32-bit timers + watchdog

V. Environment and Electrical (LSE = wide temperature + reinforcement + cooling, same as 244LSE)

Operating temperature: –40°C ~ +85°C (industrial wide temperature ✅)

Reinforcement: ✅ Strengthened welding, vibration resistance (vehicle / ship / rail)

Cooling: ✅ Original metal heat sink (passive cooling, more stable at high temperatures)

Power supply: +5V, typical 3.5A (slightly higher than 244, due to FPU + SCSI)

Size / weight: 6U VME, approximately 1.1kg (with heat sink)

VI. 252 Family Comparison (including your LSE model)

252: 0~+70°C, non-reinforcement, no cooling → standard version

252L: 0~+70°C, reinforced, no cooling → normal temperature reinforced

252LE: –40~+85°C, reinforced, no cooling → wide temperature reinforced

252LSE: –40~+85°C, reinforced + cooling → wide temperature reinforced cooling (top configuration of 252)

VII. 252LSE vs 244LSE (Most confusing for customers)

252LSE (your model): 2IP + single network + SCSI + FPU + wide temperature + reinforcement + cooling → with floating point, with SCSI, 2IP, single network

244LSE: 4IP + dual networks + no SCSI + no FPU + wide temperature + reinforcement + cooling → no floating point, no SCSI, 4IP, dual networks

One-sentence difference: 252 = floating point + SCSI + 2IP + single network; 244 = no floating point + no SCSI + 4IP + dual networks

VIII. Typical Applications (Exclusive scenarios for 252LSE)

Need floating point operations (such as motion control, algorithm calculation)

Need SCSI storage (hard disk / optical drive) Extreme temperature (-40 to +85°C) + Strong vibration + High heat dissipation requirements: Vehicle-mounted, ship-mounted, track-mounted, outdoor cabinets, military

Standard VME system, requiring communication with other VME boards

2 IP expansion cards (analog / digital / serial ports) are sufficient

IX. Compatibility and Replacement

Interchangeable within the same series: 252 / 252L / 252LE / 252LSE

Compatible with the 244 series pins, but the functions cannot be interchanged (FPU/SCSI/IP quantities / network port quantities are different)