IDT71256SA12PZI Equivalent & Substitute Parts

Part Overview

The IDT71256SA12PZI is a 256Kbit asynchronous parallel SRAM manufactured by Renesas Electronics Corporation in a 28-TSSOP package with 12 ns access time. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The part operates across the industrial temperature range of -40°C to 85°C with 5V supply voltage.

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	-40°C ~ 85°C
Package Type	28-TSSOP (0.465", 11.80mm Width)
Mounting Type	Surface Mount
RoHS Status	Non-compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the IDT71256SA12PZI is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Memory capacity: 256Kbit
Memory organization: 32K x 8
Package type: 28-TSSOP
Memory interface: Parallel asynchronous
Mounting type: Surface mount

Performance Parameters:

Access time and write cycle time determine speed compatibility
Supply voltage range determines circuit compatibility
Operating temperature range determines environmental suitability

Substitute parts are grouped by access time performance. The IDT71256SA12PZI operates at 12 ns, making IS61C256AL-12TLI the direct equivalent. Parts with slower access times (20 ns, 25 ns, 45 ns) are backward-compatible substitutes for applications where timing margins permit. Parts with different supply voltage requirements (3V vs 5V) require circuit redesign and are listed separately.

Parameter Comparison

Part Number	Manufacturer	Access Time (ns)	Write Cycle (ns)	Supply Voltage	Temp Range	Package	Product Status	RoHS Status
IDT71256SA12PZI	Renesas	12	12	4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Obsolete	Non-compliant
IS61C256AL-12TLI	ISSI	12	12	4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Active	ROHS3 Compliant
IS65C256AL-25TLA3	ISSI	25	25	4.5V ~ 5.5V	-40°C ~ 125°C	28-TSSOP	Active	ROHS3 Compliant
IS65C256AL-25TLA3-TR	ISSI	25	25	4.5V ~ 5.5V	-40°C ~ 125°C	28-TSSOP	Active	ROHS3 Compliant
IS62C256AL-45TLI	ISSI	45	45	4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Active	ROHS3 Compliant
IS62C256AL-45TLI-TR	ISSI	45	45	4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-20TLI	ISSI	20	20	3V ~ 3.6V	-40°C ~ 85°C	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-20TLI-TR	ISSI	20	20	3V ~ 3.6V	-40°C ~ 85°C	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-45TLI	ISSI	45	45	3V ~ 3.6V	-40°C ~ 85°C	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-45TLI-TR	ISSI	45	45	3V ~ 3.6V	-40°C ~ 85°C	28-TSSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (5V Supply, 12 ns Timing): IS61C256AL-12TLI is the primary substitute for IDT71256SA12PZI. Both parts share identical electrical specifications and package geometry. IS61C256AL-12TLI is manufactured by ISSI and maintains active product status with ROHS3 compliance, addressing obsolescence and regulatory requirements of the original part.

5V Supply Alternatives (Slower Timing): IS65C256AL-25TLA3 and IS65C256AL-25TLA3-TR provide 25 ns access time with extended temperature range to 125°C. These parts are suitable for applications where timing margins accommodate the 13 ns performance reduction. Both variants are available in Tray and Tape & Reel packaging.

IS62C256AL-45TLI and IS62C256AL-45TLI-TR operate at 45 ns access time. These parts are applicable only to designs with relaxed timing requirements and are available in both packaging formats.

3V Supply Alternatives: IS62LV256AL-20TLI, IS62LV256AL-20TLI-TR, IS62LV256AL-45TLI, and IS62LV256AL-45TLI-TR require circuit redesign due to different supply voltage specification (3V to 3.6V). These parts are not pin-compatible substitutes without power supply modification.

All ISSI substitute parts carry ROHS3 compliance and active product status, eliminating obsolescence risk associated with the original Renesas part.

Frequently Asked Questions (FAQ)

Q: Can IS61C256AL-12TLI directly replace IDT71256SA12PZI without circuit modification? A: Yes. IS61C256AL-12TLI matches all critical electrical and mechanical parameters: 256Kbit capacity, 32K x 8 organization, 12 ns access time, 4.5V to 5.5V supply range, 28-TSSOP package, and -40°C to 85°C operating temperature. No circuit redesign is required.

Q: What is the difference between Tray and Tape & Reel packaging options? A: Tray packaging is suitable for manual assembly and small-volume production. Tape & Reel packaging is designed for automated pick-and-place assembly equipment. Both packaging formats contain identical die and electrical specifications. Selection depends on assembly process requirements.

Q: Can slower access time parts (25 ns, 45 ns) be used as substitutes? A: Slower parts are backward-compatible substitutes only if the application timing budget accommodates the additional delay. The IDT71256SA12PZI operates at 12 ns; IS65C256AL-25TLA3 adds 13 ns additional delay, and IS62C256AL-45TLI adds 33 ns. System-level timing analysis is required to confirm compatibility.

Q: Why are IS62LV256AL parts listed if they have different supply voltage? A: IS62LV256AL parts operate at 3V to 3.6V supply, incompatible with the 4.5V to 5.5V requirement of IDT71256SA12PZI. These parts require complete power supply redesign and are not direct substitutes. They are listed for reference only in applications undergoing redesign for low-voltage operation.

Q: What is the significance of ROHS3 compliance on substitute parts? A: ROHS3 compliance indicates the part meets current environmental and hazardous substance restrictions. The original IDT71256SA12PZI is non-compliant, making ROHS3-compliant substitutes necessary for new designs and markets with regulatory requirements.

Q: Are there inventory considerations when selecting between substitute options? A: Inventory levels vary by part number and packaging format. IS62C256AL-45TLI-TR maintains the highest inventory (23,600 pcs), while IS65C256AL-25TLA3 has lower availability (740 pcs). Procurement timelines should account for inventory status and lead times.

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