IDT71256SA12PZ Equivalent & Substitute Parts

Part Overview

The IDT71256SA12PZ is a 256Kbit asynchronous parallel SRAM manufactured by Renesas Electronics Corporation in a 28-TSSOP package with 12 ns access time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The part operates across a 4.5V to 5.5V supply range with a standard industrial temperature range of 0°C to 70°C.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	12 ns
Write Cycle Time	12 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	28-TSSOP (0.465", 11.80mm Width)
Mounting Type	Surface Mount
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution for the IDT71256SA12PZ is determined by the following critical parameters:

Memory Capacity & Organization: All substitutes maintain 256Kbit capacity in 32K x 8 organization
Package Compatibility: All substitutes use 28-TSSOP surface mount packaging
Access Time Compatibility: The 12 ns access time of the original part can be replaced by parts with equal or faster access times (12 ns or lower)
Voltage Supply Range: Substitutes must operate within compatible voltage ranges
Operating Temperature Range: Substitutes must support the required temperature envelope
Interface Type: All substitutes maintain parallel interface architecture

Substitute parts are grouped into two categories based on voltage supply requirements:

Category 1 - Standard 5V Operation (4.5V ~ 5.5V): IS61C256AL-12TLI, IS62C256AL-45TLI, IS62C256AL-45TLI-TR, IS65C256AL-25TLA3, IS65C256AL-25TLA3-TR

Category 2 - Low Voltage Operation (3V ~ 3.6V): IS62LV256AL-20TLI, IS62LV256AL-20TLI-TR, IS62LV256AL-45TLI, IS62LV256AL-45TLI-TR

Parameter Comparison

Part Number	Manufacturer	Access Time (ns)	Voltage Supply	Operating Temp (°C)	Package	Product Status	RoHS Status	Packaging Type
IDT71256SA12PZ	Renesas Electronics	12	4.5V ~ 5.5V	0 ~ 70	28-TSSOP	Obsolete	Non-compliant	Tray
IS61C256AL-12TLI	ISSI	12	4.5V ~ 5.5V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant	Tray
IS62C256AL-45TLI	ISSI	45	4.5V ~ 5.5V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant	Tray
IS62C256AL-45TLI-TR	ISSI	45	4.5V ~ 5.5V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant	Tape & Reel
IS62LV256AL-20TLI	ISSI	20	3V ~ 3.6V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant	Tray
IS62LV256AL-20TLI-TR	ISSI	20	3V ~ 3.6V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant	Tape & Reel
IS62LV256AL-45TLI	ISSI	45	3V ~ 3.6V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant	Tray
IS62LV256AL-45TLI-TR	ISSI	45	3V ~ 3.6V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant	Tape & Reel
IS65C256AL-25TLA3	ISSI	25	4.5V ~ 5.5V	-40 ~ 125	28-TSSOP	Active	ROHS3 Compliant	Tray
IS65C256AL-25TLA3-TR	ISSI	25	4.5V ~ 5.5V	-40 ~ 125	28-TSSOP	Active	ROHS3 Compliant	Tape & Reel

Engineering Selection Recommendations

For Direct Replacement (Matching Voltage Supply)

The IS61C256AL-12TLI is the primary substitute for the IDT71256SA12PZ. Both parts operate at 4.5V to 5.5V with identical 12 ns access time and 28-TSSOP packaging. The IS61C256AL-12TLI is active in production status and ROHS3 compliant, addressing the obsolescence and compliance limitations of the original part. The extended operating temperature range (-40°C to 85°C) provides additional margin beyond the original 0°C to 70°C specification.

For Extended Temperature Applications

The IS65C256AL-25TLA3 and IS65C256AL-25TLA3-TR maintain 4.5V to 5.5V operation with extended temperature range to 125°C. The 25 ns access time is faster than the original 12 ns specification, making these parts suitable for applications requiring higher temperature operation without performance degradation.

For Low Voltage System Integration

The IS62LV256AL-20TLI and IS62LV256AL-20TLI-TR operate at 3V to 3.6V with 20 ns access time. These parts are appropriate for low-power system designs where the original 5V supply is not available. The IS62LV256AL-45TLI and IS62LV256AL-45TLI-TR provide the same voltage range with relaxed 45 ns timing for cost-optimized applications.

All ISSI substitutes are ROHS3 compliant and active in production, eliminating supply chain risk associated with the obsolete IDT71256SA12PZ.

Frequently Asked Questions (FAQ)

Q: Can IS62C256AL-45TLI replace IDT71256SA12PZ directly?

A: The IS62C256AL-45TLI maintains identical voltage supply (4.5V ~ 5.5V) and package (28-TSSOP), but has 45 ns access time versus the original 12 ns. This part is suitable only if the system timing budget accommodates the slower access time. The part is electrically and mechanically compatible.

Q: What is the difference between tray and tape & reel packaging?

A: Tray packaging is used for manual handling and smaller quantity orders. Tape & reel packaging (indicated by -TR suffix) is used for automated assembly processes and higher volume production. Both contain identical die and electrical specifications; the difference is only in packaging format and handling method.

Q: Why do some substitutes have different voltage ranges?

A: The IS62LV256AL series operates at 3V to 3.6V (low voltage), while IS61C256AL and IS65C256AL series operate at 4.5V to 5.5V (standard voltage). Selection depends on the system power supply architecture. Low voltage parts are not interchangeable with standard voltage parts without power supply modification.

Q: Is the extended temperature range of IS65C256AL-25TLA3 beneficial?

A: The IS65C256AL-25TLA3 extends operating temperature to -40°C to 125°C compared to the original 0°C to 70°C. This is beneficial for industrial and automotive applications requiring wider temperature operation. The 25 ns access time remains faster than the original 12 ns specification.

Q: Are all substitute parts RoHS compliant?

A: All ISSI substitute parts listed are ROHS3 compliant. The original IDT71256SA12PZ is RoHS non-compliant. Compliance is important for new designs and systems subject to environmental regulations.

Q: Can I use IS62LV256AL-45TLI in a 5V system?

A: No. The IS62LV256AL-45TLI is rated for 3V to 3.6V operation only. Using it in a 5V system will cause device damage. Voltage supply compatibility is a mandatory selection criterion.

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