IDT71256SA15PZ Equivalent & Substitute Parts

Part Overview

The IDT71256SA15PZ is a 256Kbit asynchronous parallel SRAM manufactured by Renesas Electronics Corporation in a 28-TSSOP package with 15 ns access time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring compatible memory solutions.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	15 ns
Write Cycle Time	15 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	28-TSSOP
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution compatibility for the IDT71256SA15PZ is determined by the following critical parameters:

Memory capacity (256Kbit) and organization (32K x 8)
Parallel interface architecture
Package type (28-TSSOP)
Supply voltage range (4.5V ~ 5.5V for standard variants; 3V ~ 3.6V for low-voltage variants)
Access time equal to or faster than 15 ns
Surface mount configuration

Substitute parts are grouped into two categories based on voltage specification:

Standard Voltage (4.5V ~ 5.5V): IS61C256AL-12TLI, IS62C256AL-45TLI, IS62C256AL-45TLI-TR, and IS65C256AL-25TLA3-TR provide direct electrical compatibility with the original part's supply voltage requirements.

Low Voltage (3V ~ 3.6V): IS62LV256AL-20TLI, IS62LV256AL-20TLI-TR, IS62LV256AL-45TLI, and IS62LV256AL-45TLI-TR operate at reduced supply voltages and require circuit-level voltage compatibility verification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Organization	Access Time (ns)	Voltage Supply	Operating Temp (°C)	Package	Product Status	RoHS Status
IDT71256SA15PZ	Renesas	256Kbit	32K x 8	15	4.5V ~ 5.5V	0 ~ 70	28-TSSOP	Obsolete	Non-compliant
IS61C256AL-12TLI	ISSI	256Kbit	32K x 8	12	4.5V ~ 5.5V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant
IS62C256AL-45TLI	ISSI	256Kbit	32K x 8	45	4.5V ~ 5.5V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant
IS62C256AL-45TLI-TR	ISSI	256Kbit	32K x 8	45	4.5V ~ 5.5V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-20TLI	ISSI	256Kbit	32K x 8	20	3V ~ 3.6V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-20TLI-TR	ISSI	256Kbit	32K x 8	20	3V ~ 3.6V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-45TLI	ISSI	256Kbit	32K x 8	45	3V ~ 3.6V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-45TLI-TR	ISSI	256Kbit	32K x 8	45	3V ~ 3.6V	-40 ~ 85	28-TSSOP	Active	ROHS3 Compliant
IS65C256AL-25TLA3	ISSI	256Kbit	32K x 8	25	4.5V ~ 5.5V	-40 ~ 125	28-TSSOP	Active	ROHS3 Compliant
IS65C256AL-25TLA3-TR	ISSI	256Kbit	32K x 8	25	4.5V ~ 5.5V	-40 ~ 125	28-TSSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Standard Voltage Applications (4.5V ~ 5.5V):

IS61C256AL-12TLI offers the fastest access time (12 ns) with active product status and ROHS3 compliance. This part exceeds the original 15 ns specification and supports extended operating temperature range (-40°C to 85°C).

IS65C256AL-25TLA3-TR provides 25 ns access time with the widest operating temperature range (-40°C to 125°C) and active status with full RoHS compliance. This part is suitable for applications requiring extended temperature operation.

IS62C256AL-45TLI and IS62C256AL-45TLI-TR both operate at 45 ns access time. The -TR variant uses Tape & Reel packaging. Both maintain active product status and RoHS3 compliance.

For Low Voltage Applications (3V ~ 3.6V):

IS62LV256AL-20TLI and IS62LV256AL-20TLI-TR operate at 20 ns access time with 3V ~ 3.6V supply voltage. These parts require circuit-level voltage compatibility confirmation before deployment.

IS62LV256AL-45TLI and IS62LV256AL-45TLI-TR operate at 45 ns access time with low-voltage supply. The -TR variants use Tape & Reel packaging.

All substitute parts listed maintain 28-TSSOP package compatibility, parallel interface architecture, and 256Kbit capacity with 32K x 8 organization.

Frequently Asked Questions (FAQ)

Q: Can IS62LV256AL series parts directly replace IDT71256SA15PZ in existing circuits?

A: IS62LV256AL series parts operate at 3V ~ 3.6V supply voltage, while IDT71256SA15PZ requires 4.5V ~ 5.5V. Direct substitution requires circuit-level voltage supply modification. Standard voltage ISSI parts (IS61C256AL, IS62C256AL, IS65C256AL) maintain the original 4.5V ~ 5.5V specification.

Q: What is the difference between tray and Tape & Reel packaging options?

A: Tray packaging is suitable for manual assembly and small-volume applications. Tape & Reel (-TR) packaging is optimized for automated pick-and-place assembly processes. Both packaging options contain identical die and electrical specifications.

Q: Does faster access time guarantee compatibility?

A: Faster access time (lower nanosecond value) is backward compatible with applications designed for the original 15 ns specification. IS61C256AL-12TLI at 12 ns and IS65C256AL-25TLA3 at 25 ns both meet or exceed the original timing requirements. Slower access times (45 ns variants) require timing analysis to confirm system compatibility.

Q: Are all substitute parts RoHS compliant?

A: All ISSI substitute parts listed carry ROHS3 compliance status. The original IDT71256SA15PZ is RoHS non-compliant. Substitution with ROHS3-compliant parts satisfies modern environmental and regulatory requirements.

Q: What operating temperature range should be selected?

A: The original part operates 0°C ~ 70°C. ISSI substitutes provide either -40°C ~ 85°C (standard range) or -40°C ~ 125°C (IS65C256AL series). Selection depends on application thermal requirements. Extended temperature range parts support wider deployment scenarios.

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