IS25LQ020B-JDLE Equivalent & Substitute Parts

Part Overview

The IS25LQ020B-JDLE is a 2Mbit NOR Flash memory IC manufactured by ISSI (Integrated Silicon Solution Inc) in an 8-TSSOP surface mount package. This device provides SPI and Quad I/O interface capability with a 104 MHz clock frequency, designed for non-volatile data storage applications requiring serial peripheral interface communication.

The IS25LQ020B-JDLE is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this memory IC.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile FLASH
Memory Format	FLASH - NOR
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	SPI - Quad I/O
Clock Frequency	104 MHz
Voltage Supply Range	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 105°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the IS25LQ020B-JDLE are identified based on the following critical parameters that determine functional equivalence:

Memory capacity: 2Mbit (256K x 8 organization)
Memory technology: FLASH - NOR
Serial interface: SPI with minimum 104 MHz clock frequency support
Package compatibility: 8-TSSOP surface mount form factor
Voltage supply range: Minimum overlap with 2.3V ~ 3.6V specification
Operating temperature range: Support for -40°C minimum and 105°C maximum
Compliance: ROHS3 certification

The AT25DF021A-XMHN-T meets these core substitution criteria through matching memory capacity, NOR Flash technology, SPI interface at 104 MHz, identical 8-TSSOP package, and ROHS3 compliance. Voltage and temperature specifications are evaluated for application compatibility.

Parameter Comparison

Parameter	IS25LQ020B-JDLE (Main)	AT25DF021A-XMHN-T (Substitute)
Manufacturer	ISSI	Renesas Electronics Corporation
Memory Size	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8
Memory Technology	FLASH - NOR	FLASH - NOR
Memory Interface	SPI - Quad I/O	SPI
Clock Frequency	104 MHz	104 MHz
Write Cycle Time	800µs (Page)	2.5ms (Page)
Voltage Supply Range	2.3V ~ 3.6V	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 105°C	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

The AT25DF021A-XMHN-T is an active product manufactured by Renesas Electronics Corporation and serves as a functional substitute for the obsolete IS25LQ020B-JDLE. Both devices share identical memory capacity, organization, package form factor, and clock frequency specifications.

Key considerations for substitution:

The AT25DF021A-XMHN-T operates within a lower voltage supply range (1.65V minimum versus 2.3V minimum) and supports a reduced maximum operating temperature (85°C versus 105°C). Applications requiring operation at temperatures above 85°C or with supply voltages below 1.65V require verification against specific system requirements.

The AT25DF021A-XMHN-T implements standard SPI interface, whereas the IS25LQ020B-JDLE supports Quad I/O mode. Applications utilizing Quad I/O functionality must evaluate whether standard SPI operation is acceptable or if alternative parts supporting Quad I/O are required.

Both devices maintain ROHS3 compliance and are suitable for lead-free manufacturing environments. The AT25DF021A-XMHN-T carries an MSL rating of 1 (Unlimited), providing superior moisture handling compared to the original part's MSL rating of 3.

Frequently Asked Questions (FAQ)

Q: Can the AT25DF021A-XMHN-T directly replace the IS25LQ020B-JDLE in existing designs?

A: Direct replacement is possible for applications operating within the AT25DF021A-XMHN-T specifications. The identical 8-TSSOP package and pinout support direct PCB substitution. However, verify that your application does not require Quad I/O functionality and operates within the temperature range of -40°C to 85°C.

Q: What is the difference between SPI and SPI - Quad I/O interfaces?

A: SPI - Quad I/O uses four data lines for simultaneous data transfer, increasing throughput. Standard SPI uses two data lines (MOSI/MISO). The AT25DF021A-XMHN-T supports standard SPI only. If your firmware or hardware requires Quad I/O mode, this substitute is not compatible without design modification.

Q: Are there voltage supply compatibility concerns?

A: The AT25DF021A-XMHN-T minimum supply voltage is 1.65V, lower than the IS25LQ020B-JDLE minimum of 2.3V. If your system supplies voltage between 1.65V and 2.3V, the substitute provides broader compatibility. If your system operates below 1.65V, this substitute is not suitable.

Q: What does the MSL rating difference mean for handling and storage?

A: MSL 1 (Unlimited) indicates the AT25DF021A-XMHN-T has superior moisture resistance and no time-limited storage restrictions. MSL 3 (168 Hours) for the original part requires controlled storage conditions. The substitute offers improved handling flexibility for manufacturing and storage environments.

Q: Is the package footprint identical between these parts?

A: Yes. Both devices use 8-TSSOP (0.173", 4.40mm Width) packages with identical pinouts and land patterns. PCB layout modifications are not required for physical substitution.

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