LE25S161CA-Z Equivalent & Substitute Parts

Part Overview

The LE25S161CA-Z is a 16Mbit FLASH memory integrated circuit manufactured by onsemi, featuring SPI interface operation at 70 MHz with 8 ns access time in an 8-VSOIC surface mount package. This device is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to support ongoing system maintenance, design updates, and procurement continuity where original components are no longer available through standard distribution channels.

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	70 MHz
Access Time	8 ns
Memory Organization	2M x 8
Voltage Supply Range	1.65V ~ 1.95V
Operating Temperature Range	-40°C ~ 90°C
Package Type	8-VSOIC
Mounting Type	Surface Mount
Write Cycle Time	700µs

Substitute Part Grouping Explanation

Substitution of the LE25S161CA-Z is determined by electrical and mechanical parameter equivalence across the following criteria:

Memory Capacity and Organization: The substitute part must provide 16Mbit capacity in 2M x 8 organization to maintain data storage compatibility.

Interface Protocol: SPI interface operation is required for signal compatibility with existing system designs.

Timing Specifications: Clock frequency of 70 MHz and access time of 8 ns must be maintained to ensure functional operation within system timing constraints.

Electrical Characteristics: Supply voltage range of 1.65V ~ 1.95V and operating temperature range of -40°C ~ 90°C must be supported.

Package and Mounting: 8-VSOIC package with surface mount configuration is required for physical and electrical compatibility with printed circuit board layouts.

Write Performance: Page write cycle time of 700µs must be supported.

The LE25S161CA-Z1 meets all specified parameters and qualifies as a direct substitute.

Parameter Comparison

Parameter	LE25S161CA-Z (Main Part)	LE25S161CA-Z1 (Substitute)
Manufacturer	onsemi	onsemi
Memory Size	16Mbit	16Mbit
Memory Format	FLASH	FLASH
Memory Interface	SPI	SPI
Clock Frequency	70 MHz	70 MHz
Access Time	8 ns	8 ns
Memory Organization	2M x 8	2M x 8
Voltage Supply Range	1.65V ~ 1.95V	1.65V ~ 1.95V
Operating Temperature Range	-40°C ~ 90°C	-40°C ~ 90°C
Package Type	8-VSOIC	8-VSOIC
Mounting Type	Surface Mount	Surface Mount
Write Cycle Time	700µs	700µs
Product Status	Obsolete	Active

Engineering Selection Recommendations

The LE25S161CA-Z1 is the manufacturer-recommended substitute for the obsolete LE25S161CA-Z. Both devices share identical electrical and mechanical specifications, ensuring direct functional compatibility.

Product Status Consideration: The LE25S161CA-Z1 maintains active product status with current manufacturing support, whereas the LE25S161CA-Z is classified as obsolete. Selection of the LE25S161CA-Z1 provides access to ongoing supply availability and manufacturing continuity.

Compliance Status: The LE25S161CA-Z1 carries RoHS3 compliance certification and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. The LE25S161CA-Z carries REACH unaffected status only.

Moisture Sensitivity: The LE25S161CA-Z1 is rated MSL 2 (1 Year), establishing specific handling and storage requirements for manufacturing environments.

Inventory Availability: The LE25S161CA-Z1 is available with 765 pieces in current stock, supporting immediate procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can the LE25S161CA-Z1 be used as a direct replacement for the LE25S161CA-Z?

A: Yes. The LE25S161CA-Z1 provides identical electrical and mechanical specifications, including 16Mbit capacity, SPI interface, 70 MHz clock frequency, 8 ns access time, 1.65V ~ 1.95V supply voltage range, -40°C ~ 90°C operating temperature, and 8-VSOIC package configuration. Direct substitution is supported without circuit modification.

Q: What is the primary difference between these two part numbers?

A: The LE25S161CA-Z is classified as obsolete product status, while the LE25S161CA-Z1 maintains active product status. The LE25S161CA-Z1 additionally carries RoHS3 compliance certification and MSL 2 moisture sensitivity rating.

Q: Are there any package or pinout differences?

A: No. Both devices utilize the 8-VSOIC package with identical pinout and physical dimensions (0.154" width, 3.90mm). Surface mount compatibility is maintained.

Q: What supply voltage range is supported?

A: Both devices operate within 1.65V ~ 1.95V supply voltage range. System power supply design must maintain this specification.

Q: What is the operating temperature range?

A: Both devices support -40°C ~ 90°C operating temperature range. System thermal design must maintain operation within this specification.

Q: What is the SPI clock frequency specification?

A: Both devices support 70 MHz maximum clock frequency. System timing design must not exceed this specification.

Q: What is the memory access time?

A: Both devices provide 8 ns access time. System timing calculations must account for this specification.

Q: What is the page write cycle time?

A: Both devices support 700µs page write cycle time. System firmware must account for this timing in write operation sequences.

Q: Is the LE25S161CA-Z1 RoHS compliant?

A: Yes. The LE25S161CA-Z1 carries RoHS3 compliance certification. The LE25S161CA-Z does not carry RoHS certification.

Q: What is the moisture sensitivity level of the LE25S161CA-Z1?

A: The LE25S161CA-Z1 is rated MSL 2 (1 Year), requiring controlled storage and handling conditions in manufacturing environments.

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