IDT71256L35Y Equivalent & Substitute Parts

Part Overview

The IDT71256L35Y is a 256Kbit asynchronous SRAM memory IC manufactured by Renesas Electronics Corporation in a 28-SOJ surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs, repairs, and production continuity. The part operates with a 35 ns access time and supports parallel memory interface architecture with 32K x 8 memory organization.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Type	Volatile SRAM
Memory Interface	Parallel
Access Time	35 ns
Write Cycle Time	35 ns
Supply Voltage	4.5V ~ 5.5V
Package Type	28-BSOJ (0.300", 7.62mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the IDT71256L35Y are qualified based on the following electrical and mechanical parameters:

Memory capacity: 256Kbit minimum
Memory organization: 32K x 8 configuration
Memory interface: Parallel architecture
Package type: 28-BSOJ surface mount package
Supply voltage range: 4.5V ~ 5.5V compatibility
Pin count and physical dimensions: 28-SOJ standard

The substitute parts identified (IS61C256AL-12JLI and IS61C256AL-12JLI-TR) meet all mechanical compatibility requirements and electrical specifications. Both parts are manufactured by ISSI (Integrated Silicon Solution Inc) and maintain identical memory organization, interface type, and package configuration as the original IDT71256L35Y.

Parameter Comparison

Parameter	IDT71256L35Y	IS61C256AL-12JLI	IS61C256AL-12JLI-TR
Manufacturer	Renesas Electronics	ISSI	ISSI
Memory Size	256Kbit	256Kbit	256Kbit
Memory Organization	32K x 8	32K x 8	32K x 8
Memory Type	Volatile SRAM	Volatile SRAM	Volatile SRAM
Memory Interface	Parallel	Parallel	Parallel
Access Time	35 ns	12 ns	12 ns
Write Cycle Time	35 ns	12 ns	12 ns
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	28-BSOJ	28-BSOJ	28-BSOJ
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Both IS61C256AL-12JLI and IS61C256AL-12JLI-TR are direct functional equivalents for the IDT71256L35Y. The primary advantages of these substitutes are:

Active product status with current manufacturing support
ROHS3 compliance, meeting modern environmental regulations
Faster access time (12 ns versus 35 ns), providing performance improvement
Extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C)

The IS61C256AL-12JLI-TR variant is supplied in Cut Tape (CT) and Digi-Reel packaging, while the IS61C256AL-12JLI is supplied in Tube packaging. Selection between these two should be based on procurement and assembly requirements rather than electrical performance, as both parts are electrically identical.

Frequently Asked Questions (FAQ)

Q: Can IS61C256AL-12JLI directly replace IDT71256L35Y in existing designs?

A: Yes. Both parts share identical memory capacity (256Kbit), organization (32K x 8), parallel interface architecture, supply voltage range (4.5V ~ 5.5V), and 28-BSOJ package configuration. Pin-for-pin compatibility is maintained.

Q: What is the difference between IS61C256AL-12JLI and IS61C256AL-12JLI-TR?

A: These parts are electrically identical. The difference is packaging format: IS61C256AL-12JLI is supplied in Tube packaging, while IS61C256AL-12JLI-TR is supplied in Cut Tape (CT) and Digi-Reel format. Selection depends on assembly and procurement workflow.

Q: Why do the substitute parts have faster access time (12 ns vs 35 ns)?

A: The IS61C256AL series represents a newer generation of 256Kbit SRAM technology with improved performance characteristics. The faster access time is a design improvement and does not affect compatibility in applications designed for the original 35 ns specification.

Q: Are there any temperature range considerations?

A: The substitute parts operate across -40°C ~ 85°C, compared to the original part's 0°C ~ 70°C range. This extended range provides greater flexibility for industrial and automotive applications without affecting compatibility in standard operating conditions.

Q: What is the MSL (Moisture Sensitivity Level) difference?

A: The original IDT71256L35Y has MSL 1 (unlimited shelf life), while substitutes have MSL 3 (168 hours). This requires adherence to moisture control procedures during storage and handling per IPC standards, but does not affect electrical performance or compatibility.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both IS61C256AL-12JLI and IS61C256AL-12JLI-TR are ROHS3 compliant, meeting current environmental regulations. The original IDT71256L35Y is RoHS non-compliant.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message