Equivalent & Substitute Parts for 71256SA12PDGI

Part Overview

The 71256SA12PDGI is a 256Kbit asynchronous SRAM manufactured by Renesas Electronics Corporation. This volatile memory IC features a 32K x 8 organization with 12 ns access time and parallel interface, housed in a 28-PDIP package. The device operates across a 4.5V to 5.5V supply range and supports industrial temperature specifications from -40°C to 85°C.

This part is classified as obsolete. Identifying equivalent and substitute components is necessary to support legacy system maintenance, design updates, and procurement continuity where original inventory becomes unavailable.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	256Kbit
Memory Organization	32K x 8
Technology	SRAM - Asynchronous
Memory Interface	Parallel
Access Time	12 ns
Write Cycle Time	12 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	28-DIP
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the 71256SA12PDGI is determined by strict alignment with the following core parameters:

Critical Matching Parameters:

Memory capacity: 256Kbit
Memory organization: 32K x 8
Technology: Asynchronous SRAM
Interface: Parallel
Access time: 12 ns or faster
Write cycle time: 12 ns or faster
Supply voltage: 4.5V ~ 5.5V compatible
Package: 28-DIP form factor
Mounting: Through Hole

The 71256SA12TPG manufactured by IDT (Integrated Device Technology Inc) meets all critical electrical parameters. Both devices share identical memory capacity, organization, access timing, and voltage specifications. Both are housed in 28-PDIP packages with through-hole mounting. The substitute part is currently in active product status, ensuring ongoing availability and support.

Parameter Comparison

Parameter	71256SA12PDGI (Renesas)	71256SA12TPG (IDT)	Match Status
Memory Type	Volatile SRAM	Volatile SRAM	Match
Memory Size	256Kbit	256Kbit	Match
Memory Organization	32K x 8	32K x 8	Match
Technology	SRAM - Asynchronous	SRAM - Asynchronous	Match
Memory Interface	Parallel	Parallel	Match
Access Time	12 ns	12 ns	Match
Write Cycle Time	12 ns	12 ns	Match
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	Match
Package Type	28-DIP	28-DIP	Match
Mounting Type	Through Hole	Through Hole	Match
Product Status	Obsolete	Active	Substitute is active
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	Substitute has narrower range

Engineering Selection Recommendations

The 71256SA12TPG is a direct electrical equivalent to the 71256SA12PDGI. Both devices share identical memory capacity, organization, access timing, write cycle timing, voltage specifications, and package form factor. Pin-to-pin compatibility is established through matching 28-DIP through-hole packaging.

The primary distinction is product status: the original 71256SA12PDGI is obsolete, while the 71256SA12TPG remains in active production by IDT. This status difference ensures continued component availability and manufacturing support for the substitute part.

One operational consideration exists: the 71256SA12TPG operates across a narrower temperature range (0°C to 70°C) compared to the original part (−40°C to 85°C). Applications requiring the full industrial temperature specification of the original device must evaluate whether the substitute's commercial temperature range satisfies system requirements.

Frequently Asked Questions (FAQ)

Q: Can the 71256SA12TPG directly replace the 71256SA12PDGI in existing designs?

A: Yes, from an electrical and mechanical standpoint. Both devices are 256Kbit asynchronous SRAMs with 32K x 8 organization, 12 ns access time, and 28-DIP through-hole packaging. Pin assignments and electrical characteristics are identical. The substitute is pin-compatible and functionally equivalent.

Q: What is the key difference between these two parts?

A: The 71256SA12PDGI is manufactured by Renesas and is obsolete. The 71256SA12TPG is manufactured by IDT and remains in active production. Additionally, the operating temperature range differs: the original supports −40°C to 85°C, while the substitute supports 0°C to 70°C.

Q: Does the narrower temperature range of the substitute affect compatibility?

A: This depends on the application environment. If your system operates within 0°C to 70°C, the substitute is fully compatible. If your system requires operation below 0°C or above 70°C, the substitute does not meet the original temperature specification and alternative solutions must be evaluated.

Q: Are there any package differences between these parts?

A: Both parts use 28-DIP through-hole packaging. No package conversion or adapter is required for direct substitution on existing PCBs.

Q: Why is the original part obsolete?

A: The 71256SA12PDGI is classified as obsolete by Renesas Electronics. This classification reflects the product's end-of-life status. The 71256SA12TPG from IDT provides an active-production alternative for continued system support.

Q: What certifications or compliance information is available for the substitute?

A: The 71256SA12TPG carries ECCN classification 3A991B2B and HTSUS code 8542.32.0041. These designations support export compliance and tariff classification requirements.

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