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AMD (Xilinx) AM27S181A/BUA — Memory (DRAM / SRAM / Flash / EEPROM)
AMD (Xilinx)

AMD AM27S181A/BUA PROM, 8Kbit 1Kx8, 50 ns, 32CLCC

MPNAM27S181A/BUA
End of Life

AMD AM27S181A/BUA, PROM, 8Kbit (1K x 8), 50 ns access time, parallel interface, 4.5 V supply, -55 to 125°C, 32CLCC.

$100.73Ref. price · indicative, final on quote
AM27S181A/BUA datasheet
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Specifications

AM27S181A/BUA Technical Specifications
ParameterValue
Interface_typeParallel
Mounting_typeSurface Mount
Operating temperature high-55°C to 125°C(TC)
Frame_size8Kbit
Access time50 ns
Memory_typeNon-Volatile
Package_typeBulk
Memory formatPROM
Supply_voltage_v4.5
Memory organization1K x 8

Product details

PROM for fixed-code storage in harsh environments

The AMD AM27S181A/BUA is a 8Kbit (1K x 8) bipolar PROM with a 50 ns access time, housed in a hermetic 32CLCC package. It stores fixed microcode, lookup tables, or boot sequences that are factory-programmed once and never updated. The -55 to 125°C temperature range and ceramic package suit avionics, missile guidance, satellite, and downhole tool applications where non-volatile storage must survive thermal cycling and sealed environments.

Sourcing and lifecycle reality

The lifecycle record shows an active status alongside an EOL-hot flag, indicating AMD has phased out or is phasing out this bipolar PROM process. No official successor is listed. For new production or long-life programs, verify availability before freezing the BOM. This part is sourced to order through independent distribution; current pricing and lead time are confirmed at quote time against an RFQ.

Frequently asked questions

What is the closest functional second-source for the AM27S181A/BUA?

The AM27S37/BUA is a near-identical PROM at 8Kbit (1K x 8) in the same 32CLCC package with the same 4.5 V supply and military temperature range, but with a 45 ns access time. The 5 ns difference is small enough that a board designed for the 50 ns part will typically meet timing with the faster sibling.

Will the AM27S181A/BUA drop into a board that was specified around the AM27S37/BUA?

Yes — both parts share the same 32CLCC package, pinout, 4.5 V supply, and 1K x 8 organization. The 50 ns access time of the AM27S181A/BUA is slightly slower than the 45 ns of the AM27S37/BUA, so verify that the host processor's address-to-output timing is met with the slower part.