MX29F400CBTC-70G Equivalent & Substitute Parts

Part Overview

The MX29F400CBTC-70G is a FLASH NOR Memory IC with 4Mbit capacity, organized as 512K x 8, featuring parallel interface and 70 ns access time in a 48-TFSOP package. This part is classified as Not For New Designs, making identification of equivalent and substitute components essential for ongoing system support, legacy device maintenance, and production continuity. Substitute parts must maintain electrical compatibility across memory capacity, interface type, voltage supply, and package specifications while accommodating variations in access time and operating temperature ranges.

Substiute Parts

MX29F400CBTC-70G

MacronixIn Stock: 778MX29F400CBTC-70G Datasheet

Current PartRFQ

MX29F400CBTI-70G

MacronixIn Stock: 1552MX29F400CBTI-70G Datasheet

DirectRFQ

MX29F400CBTC-90G

MacronixIn Stock: 1302MX29F400CBTC-90G Datasheet

MFR RecommendedRFQ

MX29F400CTTC-90G

MacronixIn Stock: 840MX29F400CTTC-90G Datasheet

MFR RecommendedRFQ

MX29F400CTTI-70G

MacronixIn Stock: 1428MX29F400CTTI-70G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MX29F400CBTC-70G is determined by strict equivalence in the following critical parameters:

Mandatory Equivalence Parameters:

• Memory Size: 4Mbit
• Memory Organization: 512K x 8
• Memory Format: FLASH
• Technology: FLASH - NOR
• Memory Interface: Parallel
• Voltage Supply: 4.5V ~ 5.5V
• Package / Case: 48-TFSOP (0.724", 18.40mm Width)
• Mounting Type: Surface Mount

Variable Parameters (Substitution Allowed):

• Access Time: 70 ns or slower (90 ns acceptable for timing-relaxed applications)
• Operating Temperature Range: May extend beyond 0°C ~ 70°C (e.g., -40°C ~ 85°C)
• Product Status: Active status preferred over Not For New Designs

All substitute parts must maintain ROHS3 compliance and MSL 3 rating to ensure environmental and reliability standards compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Identical Access Time - 70 ns):

MX29F400CBTI-70G and MX29F400CTTI-70G are direct functional equivalents with identical 70 ns access time. Both parts carry Active product status, providing superior long-term availability compared to the Not For New Designs classification of the original part. Both support extended operating temperature range (-40°C ~ 85°C), enabling deployment in wider environmental conditions. Selection between these two should be based on internal device architecture differences (CBT vs CTT suffix designations) and specific application thermal requirements.

Secondary Substitutes (Relaxed Access Time - 90 ns):

MX29F400CBTC-90G and MX29F400CTTC-90G provide functional substitution for applications where 90 ns access time is acceptable. These parts maintain the original 0°C ~ 70°C operating temperature range and Active product status. Use these substitutes only when system timing margins accommodate the additional 20 ns access time delay.

Compliance Assurance:

All substitute parts maintain ROHS3 compliance and MSL 3 rating, ensuring compatibility with modern manufacturing and environmental standards. No compliance degradation occurs with any listed substitute.

Frequently Asked Questions (FAQ)

Q: Can MX29F400CBTI-70G directly replace MX29F400CBTC-70G?

A: Yes. Both parts share identical memory capacity (4Mbit), organization (512K x 8), interface (Parallel), voltage supply (4.5V ~ 5.5V), package (48-TFSOP), and access time (70 ns). MX29F400CBTI-70G offers superior product status (Active) and extended operating temperature range (-40°C ~ 85°C).

Q: What is the difference between the 70 ns and 90 ns variants?

A: Access time specifies the maximum delay from address input to valid data output. The 70 ns variant (MX29F400CBTC-70G, MX29F400CBTI-70G, MX29F400CTTI-70G) provides faster data retrieval. The 90 ns variant (MX29F400CBTC-90G, MX29F400CTTC-90G) introduces 20 ns additional latency. Substitution to 90 ns parts is valid only when system timing design accommodates this delay.

Q: Are CBT and CTT suffix designations functionally equivalent?

A: Both CBT and CTT variants maintain identical electrical specifications for memory capacity, organization, interface, voltage, and package. Suffix differences reflect internal device architecture or manufacturing process variations. Consult device datasheets for specific architectural distinctions if critical to application requirements.

Q: Can I use a part with extended temperature range (-40°C ~ 85°C) in a 0°C ~ 70°C application?

A: Yes. Extended temperature range parts (MX29F400CBTI-70G, MX29F400CTTI-70G) are fully compatible with applications specified for 0°C ~ 70°C operation. The extended range provides additional operational margin without degrading performance within the narrower temperature window.

Q: What is the impact of Product Status on part selection?

A: Not For New Designs status indicates the manufacturer has discontinued active development and may limit future availability. Active status parts (MX29F400CBTI-70G, MX29F400CTTI-70G, MX29F400CBTC-90G, MX29F400CTTC-90G) provide superior long-term supply assurance and are preferred for new applications and ongoing production.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts in this equivalency list maintain ROHS3 compliance and MSL 3 rating, ensuring compatibility with current manufacturing standards and environmental regulations.