M58LR256KB70ZC5Z Equivalent & Substitute Parts

Part Overview

The M58LR256KB70ZC5Z is a 256Mbit parallel NOR Flash memory IC manufactured by Micron Technology Inc., housed in a 79-VFBGA (9x11) package. This component operates at 66 MHz with a 70 ns access time and supports a supply voltage range of 1.7V to 2V. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Memory Size	256Mbit
Memory Organization	16M x 16
Memory Interface	Parallel
Clock Frequency	66 MHz
Access Time	70 ns
Write Cycle Time	70 ns
Voltage Supply Range	1.7V ~ 2V
Operating Temperature	-30°C ~ 85°C
Package Type	79-VFBGA (9x11)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the M58LR256KB70ZC5Z is determined by strict equivalence across the following critical parameters:

Memory capacity: 256Mbit
Memory organization: 16M x 16 configuration
Interface type: Parallel
Clock frequency: 66 MHz
Access and write cycle timing: 70 ns
Supply voltage range: 1.7V ~ 2V
Operating temperature range: -30°C ~ 85°C
Physical package: 79-VFBGA (9x11)
Mounting configuration: Surface Mount

The M58LR256KB70ZC5E meets all these parameters and is classified as a parametric equivalent. The substitution is valid based on identical electrical specifications and mechanical compatibility.

Parameter Comparison

Parameter	M58LR256KB70ZC5Z	M58LR256KB70ZC5E
Manufacturer	Micron Technology Inc.	Micron Technology Inc.
Memory Size	256Mbit	256Mbit
Memory Organization	16M x 16	16M x 16
Memory Interface	Parallel	Parallel
Clock Frequency	66 MHz	66 MHz
Access Time	70 ns	70 ns
Write Cycle Time	70 ns	70 ns
Voltage Supply	1.7V ~ 2V	1.7V ~ 2V
Operating Temperature	-30°C ~ 85°C	-30°C ~ 85°C
Package Type	79-VFBGA (9x11)	79-VFBGA (9x11)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The M58LR256KB70ZC5E is a direct parametric substitute for the M58LR256KB70ZC5Z. Both components share identical electrical and mechanical specifications, including memory capacity, interface type, timing characteristics, voltage requirements, and package configuration. The primary distinction is product status: the original part is obsolete while the substitute remains in active production.

Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with current manufacturing and storage requirements. The substitute part is available in higher inventory quantities, supporting procurement continuity for applications requiring this memory IC.

Frequently Asked Questions (FAQ)

Q: Can M58LR256KB70ZC5E directly replace M58LR256KB70ZC5Z in existing designs?

A: Yes. The substitute part is electrically and mechanically identical across all specified parameters. No design modifications are required for direct substitution.

Q: What is the significance of the different product status classifications?

A: The original part (M58LR256KB70ZC5Z) is obsolete and no longer manufactured. The substitute (M58LR256KB70ZC5E) is actively produced, ensuring long-term availability for component procurement and system support.

Q: Are there any differences in compliance certifications between these parts?

A: No. Both parts maintain identical RoHS3 compliance status and MSL ratings. Compliance requirements for manufacturing, storage, and handling are equivalent.

Q: Does the 79-VFBGA package require specific PCB design considerations?

A: The package type and pin configuration are identical between both parts. Existing PCB designs and assembly processes require no modification.

Q: What inventory status should be considered for procurement decisions?

A: The substitute part (M58LR256KB70ZC5E) has higher available inventory (1600 Pcs) compared to the original part (1592 Pcs), supporting more reliable procurement timelines.

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