IDT71256SA25PZ Equivalent & Substitute Parts

Part Overview

The IDT71256SA25PZ is a 256Kbit asynchronous parallel SRAM manufactured by Renesas Electronics Corporation in a 28-TSSOP package with 25 ns access time. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The device operates at 4.5V to 5.5V supply voltage with a standard industrial temperature range of 0°C to 70°C.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	25 ns
Write Cycle Time	25 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	28-TSSOP
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the IDT71256SA25PZ is determined by the following critical parameters:

Memory Capacity & Organization: All substitutes must provide 256Kbit capacity in 32K x 8 organization
Package Compatibility: All substitutes use 28-TSSOP (0.465", 11.80mm Width) surface mount package
Parallel Interface: All substitutes maintain parallel memory interface
Supply Voltage Compatibility: Substitutes are grouped by voltage requirement (4.5V–5.5V or 3V–3.6V)
Access Time: Substitutes with equal or faster access time are electrically compatible
Operating Temperature Range: Substitutes with equal or wider temperature range are compatible

Substitutes are organized into two voltage families: standard 5V SRAM devices and low-voltage 3.3V SRAM devices. Within each family, faster access time variants provide backward compatibility with the original 25 ns specification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Access Time (ns)	Voltage Supply	Temp Range (°C)	Package	Product Status	RoHS Status
IDT71256SA25PZ	Renesas	256Kbit	25	4.5V–5.5V	0 to 70	28-TSSOP	Obsolete	Non-compliant
IS61C256AL-12TLI	ISSI	256Kbit	12	4.5V–5.5V	-40 to 85	28-TSSOP	Active	ROHS3 Compliant
IS62C256AL-45TLI	ISSI	256Kbit	45	4.5V–5.5V	-40 to 85	28-TSSOP	Active	ROHS3 Compliant
IS62C256AL-45TLI-TR	ISSI	256Kbit	45	4.5V–5.5V	-40 to 85	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-20TLI	ISSI	256Kbit	20	3V–3.6V	-40 to 85	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-20TLI-TR	ISSI	256Kbit	20	3V–3.6V	-40 to 85	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-45TLI	ISSI	256Kbit	45	3V–3.6V	-40 to 85	28-TSSOP	Active	ROHS3 Compliant
IS62LV256AL-45TLI-TR	ISSI	256Kbit	45	3V–3.6V	-40 to 85	28-TSSOP	Active	ROHS3 Compliant
IS65C256AL-25TLA3	ISSI	256Kbit	25	4.5V–5.5V	-40 to 125	28-TSSOP	Active	ROHS3 Compliant
IS65C256AL-25TLA3-TR	ISSI	256Kbit	25	4.5V–5.5V	-40 to 125	28-TSSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

For 5V Supply Systems (4.5V–5.5V):

IS65C256AL-25TLA3 and IS65C256AL-25TLA3-TR provide direct electrical equivalence to the IDT71256SA25PZ with matching 25 ns access time and identical voltage specification. These parts are active production items with ROHS3 compliance and extended temperature range (-40°C to 125°C). The -TR suffix indicates Tape & Reel packaging for automated assembly.

IS61C256AL-12TLI offers superior performance with 12 ns access time while maintaining 5V supply compatibility and active product status with full RoHS3 compliance.

IS62C256AL-45TLI and IS62C256AL-45TLI-TR provide functional equivalence with 45 ns access time, suitable for applications where timing margin exists beyond the original 25 ns specification.

For 3.3V Supply Systems (3V–3.6V):

IS62LV256AL-20TLI and IS62LV256AL-20TLI-TR operate at low voltage with 20 ns access time, meeting or exceeding the original 25 ns timing requirement. These are active production parts with ROHS3 compliance.

IS62LV256AL-45TLI and IS62LV256AL-45TLI-TR provide low-voltage operation with 45 ns access time for applications with relaxed timing constraints.

All substitute parts are manufactured by ISSI (Integrated Silicon Solution Inc.), maintain identical 28-TSSOP package geometry, and are classified as active production items with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can IS65C256AL-25TLA3 directly replace IDT71256SA25PZ?

A: Yes. Both parts operate at 4.5V–5.5V supply voltage, provide 256Kbit capacity in 32K x 8 organization, and deliver 25 ns access time. The IS65C256AL-25TLA3 is pin-compatible in the 28-TSSOP package and is an active production part with RoHS3 compliance.

Q: What is the difference between IS62C256AL-45TLI and IS62C256AL-45TLI-TR?

A: Both parts are electrically identical with 45 ns access time and 5V supply operation. The -TR suffix indicates Tape & Reel packaging for automated pick-and-place assembly, while the non-TR version is supplied in Tray packaging for manual handling.

Q: Can I use IS62LV256AL-20TLI in a 5V system?

A: No. IS62LV256AL-20TLI operates at 3V–3.6V supply voltage and is not compatible with 4.5V–5.5V systems. Use IS65C256AL-25TLA3 or IS62C256AL-45TLI for 5V applications.

Q: Does faster access time guarantee compatibility?

A: Yes. IS61C256AL-12TLI with 12 ns access time is electrically compatible with the original 25 ns specification because faster devices meet or exceed timing requirements. Slower devices (45 ns) are compatible only if system timing allows the additional delay.

Q: Are all substitute parts RoHS compliant?

A: Yes. All ISSI substitute parts listed are ROHS3 compliant. The original IDT71256SA25PZ is RoHS non-compliant.

Q: What is the temperature range difference?

A: The original IDT71256SA25PZ operates 0°C to 70°C. Most ISSI substitutes operate -40°C to 85°C, providing wider temperature coverage. IS65C256AL-25TLA3 extends to -40°C to 125°C for high-temperature applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message