IS43DR16640B-3DBI-TR Equivalent & Substitute Parts

Part Overview

The IS43DR16640B-3DBI-TR is a 1Gbit DDR2 SDRAM memory IC manufactured by Integrated Silicon Solution (ISSI) in a 84-TWBGA package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates at 333 MHz with 450 ps access time and is suitable for applications requiring parallel DRAM interfaces with 64M x 16 memory organization.

Key Parameters

Parameter	Value
Memory Size	1Gbit
Memory Type	SDRAM - DDR2
Memory Organization	64M x 16
Clock Frequency	333 MHz
Access Time	450 ps
Write Cycle Time	15 ns
Voltage Supply	1.7V ~ 1.9V
Operating Temperature	-40°C ~ 85°C
Package Type	84-TWBGA (8x12.5)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the IS43DR16640B-3DBI-TR is determined by strict alignment of the following parameters:

Critical Matching Parameters:

Memory Size: 1Gbit
Memory Type: SDRAM - DDR2
Memory Organization: 64M x 16
Clock Frequency: 333 MHz or higher
Access Time: 450 ps or faster
Voltage Supply: 1.7V ~ 1.9V
Package Type: 84-TWBGA or 84-FBGA (8x12.5)
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories:

Parametric Equivalents (ISSI): Parts with identical electrical specifications and compatible packaging. These include IS43DR16640C-3DBLI-TR and IS46DR16640C-3DBLA1-TR, both active products with matching memory organization and performance characteristics.

Manufacturer Recommended Alternatives (Micron): Parts with enhanced specifications including higher clock frequency (400 MHz) and faster access time (400 ps), providing superior performance while maintaining backward compatibility with the original supply voltage and operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Memory Organization	Clock Frequency	Access Time	Package	Operating Temp	Product Status
IS43DR16640B-3DBI-TR	ISSI	64M x 16	333 MHz	450 ps	84-TWBGA	-40°C ~ 85°C	Obsolete
IS43DR16640C-3DBLI-TR	ISSI	64M x 16	333 MHz	450 ps	84-TWBGA	-40°C ~ 85°C	Active
IS46DR16640C-3DBLA1-TR	ISSI	64M x 16	333 MHz	450 ps	84-TWBGA	-40°C ~ 85°C	Active
IS43DR81280C-3DBLI-TR	ISSI	128M x 8	333 MHz	450 ps	60-TWBGA	-40°C ~ 85°C	Active
MT47H64M16NF-25E IT:M	Micron	64M x 16	400 MHz	400 ps	84-FBGA	-40°C ~ 95°C	Active
MT47H64M16NF-25E AAT:M	Micron	64M x 16	400 MHz	400 ps	84-FBGA	-40°C ~ 105°C	Active
MT47H64M16NF-25E AIT:M	Micron	64M x 16	400 MHz	400 ps	84-FBGA	-40°C ~ 95°C	Active
MT47H64M16NF-25E:M	Micron	64M x 16	400 MHz	400 ps	84-FBGA	0°C ~ 85°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select IS43DR16640C-3DBLI-TR or IS46DR16640C-3DBLA1-TR. Both are active ISSI products with matching electrical and mechanical specifications to the obsolete IS43DR16640B-3DBI-TR. These parts maintain identical memory organization (64M x 16), clock frequency (333 MHz), and access time (450 ps). Both are ROHS3 compliant with MSL rating 3.

For Enhanced Performance Applications: The Micron MT47H64M16NF-25E series offers superior performance with 400 MHz clock frequency and 400 ps access time. Select based on operating temperature and packaging requirements:

MT47H64M16NF-25E IT:M: Standard industrial temperature range (-40°C ~ 95°C), bulk packaging
MT47H64M16NF-25E AAT:M: Extended automotive temperature range (-40°C ~ 105°C), AEC-Q100 qualified, tray packaging
MT47H64M16NF-25E AIT:M: Automotive temperature range (-40°C ~ 95°C), AEC-Q100 qualified, bulk packaging
MT47H64M16NF-25E:M: Commercial temperature range (0°C ~ 85°C), tray packaging

All Micron alternatives maintain 1.7V ~ 1.9V supply voltage compatibility and ROHS3 compliance.

For Different Memory Organization: IS43DR81280C-3DBLI-TR provides 128M x 8 organization in a 60-TWBGA package. This part is suitable only when system architecture supports 8-bit data width instead of 16-bit.

Frequently Asked Questions (FAQ)

Q: Can IS43DR16640C-3DBLI-TR directly replace IS43DR16640B-3DBI-TR? A: Yes. Both parts share identical electrical specifications (333 MHz, 450 ps access time, 64M x 16 organization) and compatible 84-TWBGA packaging. The primary difference is product status: IS43DR16640C-3DBLI-TR is active while the original is obsolete.

Q: What is the difference between ISSI and Micron substitute options? A: ISSI substitutes (IS43DR16640C-3DBLI-TR, IS46DR16640C-3DBLA1-TR) provide identical specifications. Micron alternatives (MT47H64M16NF-25E series) offer enhanced performance with 400 MHz frequency and 400 ps access time, providing faster operation while maintaining backward voltage compatibility.

Q: Are Micron MT47H64M16NF-25E parts backward compatible? A: Electrically yes. The Micron parts operate at the same 1.7V ~ 1.9V supply voltage and maintain 64M x 16 memory organization. However, they use 84-FBGA packaging instead of 84-TWBGA. Verify PCB footprint compatibility before selection.

Q: What does AEC-Q100 qualification mean? A: AEC-Q100 is an automotive qualification standard. MT47H64M16NF-25E AAT:M and MT47H64M16NF-25E AIT:M carry this qualification, making them suitable for automotive applications requiring extended temperature ranges and reliability assurance.

Q: Can IS43DR81280C-3DBLI-TR be used as a substitute? A: Only if system architecture supports 128M x 8 memory organization. This part differs from the original in both memory organization (128M x 8 vs. 64M x 16) and package size (60-TWBGA vs. 84-TWBGA). Substitution requires design verification.

Q: What is the significance of packaging variants (IT:M, AAT:M, AIT:M, :M)? A: These designations indicate packaging and temperature grade combinations. IT:M and AIT:M are bulk packaging; AAT:M and :M are tray packaging. Temperature grades range from commercial (0°C ~ 85°C) to automotive extended (-40°C ~ 105°C). Select based on application requirements and supply chain preferences.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL rating 3 (168 hours), matching the original part's environmental and regulatory status.

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