MT48LC4M32B2TG-6A:L Equivalent & Substitute Parts

Part Overview

The MT48LC4M32B2TG-6A:L is a 128Mbit SDRAM memory IC manufactured by Alliance Memory, Inc., configured as 4M x 32 with parallel interface architecture. This component operates at 167 MHz clock frequency with 5.4 ns access time, designed for surface mount applications in the 86-TSOP II package. The part is classified as obsolete, making equivalent substitutes necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Memory Size	128Mbit
Memory Organization	4M x 32
Memory Format	DRAM
Technology	SDRAM
Memory Interface	Parallel
Clock Frequency	167 MHz
Access Time	5.4 ns
Voltage Supply	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Package Type	86-TSOP II
Mounting Type	Surface Mount
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MT48LC4M32B2TG-6A:L is determined by the following critical parameters:

Memory capacity: 128Mbit
Memory organization: 4M x 32
Technology: SDRAM with parallel interface
Access time: 5.4 ns
Supply voltage: 3V ~ 3.6V
Mounting type: Surface mount

The substitute parts identified maintain these core electrical specifications. Package variations (86-TSOP II versus 90-TFBGA) are acceptable where PCB layout and socket compatibility permit. Clock frequency differences (143 MHz versus 167 MHz) do not disqualify substitutes, as lower clock speeds remain compatible with systems designed for the original 167 MHz specification.

Parameter Comparison

Parameter	MT48LC4M32B2TG-6A:L	AS4C4M32S-7BCN	IS42S32400F-7TL	IS45S32400F-7TLA2
Manufacturer	Alliance Memory, Inc.	Alliance Memory, Inc.	ISSI	ISSI
Memory Size	128Mbit	128Mbit	128Mbit	128Mbit
Memory Organization	4M x 32	4M x 32	4M x 32	4M x 32
Technology	SDRAM	SDRAM	SDRAM	SDRAM
Memory Interface	Parallel	Parallel	Parallel	Parallel
Clock Frequency	167 MHz	143 MHz	143 MHz	143 MHz
Access Time	5.4 ns	5.4 ns	5.4 ns	5.4 ns
Voltage Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 105°C
Package Type	86-TSOP II	90-TFBGA (8x13)	86-TSOP II	86-TSOP II
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AS4C4M32S-7BCN is an active product from the same manufacturer (Alliance Memory, Inc.) with identical memory specifications and electrical parameters. This substitute requires PCB redesign due to package change from 86-TSOP II to 90-TFBGA. ROHS3 compliance provides environmental regulatory advantage over the original obsolete part.

IS42S32400F-7TL maintains the original 86-TSOP II package footprint, eliminating PCB redesign requirements. Manufactured by ISSI, this part provides direct pin-compatible substitution with identical electrical specifications and ROHS3 compliance. Operating temperature range remains 0°C ~ 70°C.

IS45S32400F-7TLA2 offers the same 86-TSOP II package compatibility as the original part with extended operating temperature range (-40°C ~ 105°C). ISSI manufacture and ROHS3 compliance are provided. This variant supports applications requiring wider temperature operation.

Frequently Asked Questions (FAQ)

Q: Can AS4C4M32S-7BCN replace MT48LC4M32B2TG-6A:L without PCB modification?

A: No. AS4C4M32S-7BCN uses 90-TFBGA packaging versus the original 86-TSOP II. PCB layout and socket redesign are required. Electrical compatibility is complete.

Q: Are IS42S32400F-7TL and IS45S32400F-7TLA2 pin-compatible with the original part?

A: Yes. Both ISSI parts use 86-TSOP II packaging, providing direct footprint compatibility. No PCB modification is necessary for these substitutes.

Q: What is the significance of the extended temperature range in IS45S32400F-7TLA2?

A: IS45S32400F-7TLA2 operates from -40°C to 105°C versus 0°C to 70°C for the original part. This extended range supports applications in industrial or automotive environments requiring wider temperature operation.

Q: Does the 143 MHz clock frequency in substitute parts affect compatibility?

A: No. The 143 MHz specification in substitute parts is lower than the original 167 MHz. Systems designed for 167 MHz operation remain compatible with 143 MHz components, as the lower frequency does not exceed system timing requirements.

Q: What are the RoHS compliance implications?

A: The original MT48LC4M32B2TG-6A:L is RoHS non-compliant. All three substitute parts are ROHS3 compliant, meeting current environmental and regulatory standards for new designs and systems subject to RoHS requirements.

Q: Which substitute is recommended for direct replacement in existing systems?

A: IS42S32400F-7TL or IS45S32400F-7TLA2 are recommended for direct replacement due to 86-TSOP II package compatibility. Selection between these two depends on operating temperature requirements of the application.

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