Skip to main content
AMD (Xilinx) AM27S25A/B3A — Memory (DRAM / SRAM / Flash / EEPROM)
AMD (Xilinx)

AMD AM27S25A/B3A PROM 4Kbit Parallel, 35 ns, -55 to 125°C

MPNAM27S25A/B3A
End of Life

AMD AM27S25A/B3A, 4Kbit (512 x 8) parallel PROM, 35 ns access time, 4.5 V supply, -55°C to 125°C, 28-pin CLCC, surface mount, bulk.

$132.89Ref. price · indicative, final on quote
AM27S25A/B3A datasheet
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

AM27S25A/B3A Technical Specifications
ParameterValue
Interface_typeParallel
Mounting_typeSurface Mount
Operating temperature high-55°C to 125°C (TC)
Frame_size4Kbit
Access time35 ns
Memory_typeNon-Volatile
Package_typeBulk
Memory formatPROM
Supply_voltage_v4.5
Memory organization512 x 8

Product details

Military temperature range — deployment context

Rated for -55°C to 125°C (TC), this PROM is built for the military temperature grade. That puts it into avionics black boxes, missile guidance electronics, satellite payloads, and downhole instrumentation — environments where the ceramic CLCC package and the wide temperature tolerance are non-negotiable. The 28-pin CLCC is a hermetic, surface-mount package; it seals the die against moisture and contamination, which is why this part shows up in long-life mission designs where conformal coating alone isn't enough.

Package and mounting — CLCC surface mount

The 28-pin ceramic leaded chip carrier (CLCC) is surface-mount. It sits flat on the PCB and is soldered directly to pads — no socket required, though a CLCC socket is available for prototyping. The ceramic body handles the full -55°C to 125°C range without the expansion mismatch you get with plastic packages. If your existing board was laid out for a through-hole PROM like the AM27S27/BWA (same 4Kbit x 8, 65 ns, through-hole), this CLCC part will not drop in without a board respin.

Frequently asked questions

What is the closest functional second-source for AM27S25A/B3A?

The AM27S29/B2A is a functional alternative with the same 4Kbit x 8 organization, 4.5 V supply, and military temperature range, but its access time is 70 ns — roughly half the speed of the 35 ns AM27S25A/B3A. Verify bus timing before substituting.

Will AM27S25A/B3A drop into a board designed for AM27S29/B2A?

Yes, both are 28-pin CLCC surface-mount packages with the same 4Kbit x 8 organization, 4.5 V supply, and military temperature range. The pinout is compatible, but the AM27S25A/B3A is faster at 35 ns versus 70 ns — the board will run fine, but timing margins will change.