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AMD (Xilinx) AM27S29/B2A — Memory (DRAM / SRAM / Flash / EEPROM)
AMD (Xilinx)

AMD AM27S29/B2A PROM, 4Kbit, 70 ns, 20CLCC

MPNAM27S29/B2A
End of Life

AMD AM27S29/B2A PROM, 4Kbit (512 x 8), 70 ns access time, parallel interface, 20-lead ceramic LCC, surface mount, -55°C to 125°C case temperature range.

$58.59Ref. price · indicative, final on quote
AM27S29/B2A datasheet
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Specifications

AM27S29/B2A Technical Specifications
ParameterValue
Interface_typeParallel
Mounting_typeSurface Mount
Operating temperature high-55°C to 125°C (TC)
Frame_size4Kbit
Access time70 ns
Memory_typeNon-Volatile
Package_typeBulk
Memory formatPROM
Supply_voltage_v4.5
Memory organization512 x 8

Product details

70 ns access time — what it means for the bus

The AMD AM27S29/B2A is a 4Kbit PROM organized 512 x 8 with a 70 ns access time.

Military temperature range — deployment context

Rated for -55°C to 125°C case temperature, this PROM operates on a 4.5 V supply rail.

OTP memory: no field updates possible

This is a one-time-programmable PROM — the memory content is fused at the factory or during board-level programming. There is no erase window, no EEPROM rewrite. That is the trade-off for the fast, deterministic access time and the hermetic package: once the pattern is set, it stays. For a production run where the microcode is locked and field updates are not required, this is a reliable, no-surprises part. For a prototype or a system that needs firmware patches, a UV-erasable EPROM or a flash part would be the alternative.

Lifecycle and sourcing reality

Mounting and board integration

The 20-lead ceramic LCC is a surface-mount package.

Frequently asked questions

What is the closest functional second-source for AM27S29/B2A?

The AM27S25A/B3A is a pin-compatible 4Kbit PROM in the same ceramic LCC package with a faster 35 ns access time. It shares the same 512 x 8 organization, 4.5 V supply, and military temperature range, so it can serve as a drop-in replacement if the bus timing allows.

Will AM27S29/B2A drop into a panel specified around AM27S25A/B3A without rewiring?

Yes, the AM27S29/B2A is pin-compatible with the AM27S25A/B3A — same package, same pinout, same supply voltage. The only difference is the access time: 70 ns vs 35 ns. If the board was designed for the faster part, the 70 ns part will work as long as the CPU wait-state configuration accommodates the slower read cycle.