IS43LD16640A-25BL Equivalent & Substitute Parts

Part Overview

The IS43LD16640A-25BL is a 1Gbit SDRAM Mobile LPDDR2 memory IC manufactured by ISSI (Integrated Silicon Solution Inc). This parallel interface memory device operates at 400 MHz with a 134-TFBGA package footprint of 10x11.5mm. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring compatible LPDDR2 memory solutions.

Key Parameters

Parameter	Value
Manufacturer	ISSI (Integrated Silicon Solution Inc)
Memory Type	Volatile DRAM
Technology	SDRAM - Mobile LPDDR2
Memory Size	1Gbit
Memory Organization	64M x 16
Memory Interface	Parallel
Clock Frequency	400 MHz
Write Cycle Time	15ns
Voltage Supply Range	1.14V ~ 1.95V
Operating Temperature	0°C ~ 85°C
Package Type	134-TFBGA (10x11.5mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the IS43LD16640A-25BL is determined by the following critical parameters:

Memory capacity: 1Gbit
Memory organization: 64M x 16
Technology standard: SDRAM Mobile LPDDR2 family
Clock frequency: 400 MHz
Voltage supply range: 1.14V ~ 1.95V
Package: 134-TFBGA (10x11.5mm)
Write cycle time: 15ns
Operating temperature range: 0°C ~ 85°C

The IS43LD16640C-25BL qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. Both parts share the same base product number (IS43LD16640), memory capacity, organization, interface type, clock frequency, voltage specifications, package footprint, and thermal operating range. The primary distinction is the technology variant designation (LPDDR2 versus LPDDR2-S4) and product status (discontinued versus active).

Parameter Comparison

Parameter	IS43LD16640A-25BL (Main)	IS43LD16640C-25BL (Substitute)
Manufacturer	ISSI	ISSI
Memory Type	Volatile DRAM	Volatile DRAM
Technology	SDRAM - Mobile LPDDR2	SDRAM - Mobile LPDDR2-S4
Memory Size	1Gbit	1Gbit
Memory Organization	64M x 16	64M x 16
Memory Interface	Parallel	Parallel
Clock Frequency	400 MHz	400 MHz
Write Cycle Time	15ns	15ns
Voltage Supply Range	1.14V ~ 1.95V	1.14V ~ 1.95V
Operating Temperature	0°C ~ 85°C (TA)	0°C ~ 85°C (TC)
Package Type	134-TFBGA (10x11.5mm)	134-TFBGA (10x11.5mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)
Product Status	Discontinued at DiGi Electronics	Active

Engineering Selection Recommendations

The IS43LD16640C-25BL is the qualified substitute for the discontinued IS43LD16640A-25BL. Both parts maintain identical electrical specifications, memory capacity, organization, interface protocol, clock frequency, voltage supply range, write cycle timing, and thermal operating parameters. The 134-TFBGA package footprint is identical, ensuring mechanical compatibility in existing PCB designs.

The IS43LD16640C-25BL carries active product status with confirmed inventory availability (958 Pcs), whereas the original part is discontinued. Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings. The technology variant designation (LPDDR2-S4 versus LPDDR2) reflects ISSI's product line evolution while preserving functional equivalence for the specified electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can the IS43LD16640C-25BL be used as a direct replacement for the IS43LD16640A-25BL?

A: Yes. Both parts share identical memory capacity (1Gbit), organization (64M x 16), clock frequency (400 MHz), voltage supply range (1.14V ~ 1.95V), write cycle time (15ns), operating temperature range (0°C ~ 85°C), and 134-TFBGA package dimensions (10x11.5mm). All critical electrical and mechanical parameters match.

Q: What is the difference between LPDDR2 and LPDDR2-S4 designations?

A: The technology variant designation reflects ISSI's product line classification. Both variants meet the same electrical specifications, memory organization, clock frequency, and voltage requirements for this application. The functional parameters that determine substitution eligibility are identical.

Q: Are there any compliance or certification differences?

A: Both parts maintain ROHS3 compliance, identical moisture sensitivity levels (MSL 3, 168 Hours), and REACH unaffected status. Compliance certifications are equivalent.

Q: What is the primary reason to select the IS43LD16640C-25BL?

A: The IS43LD16640C-25BL is the appropriate selection because the original IS43LD16640A-25BL is discontinued. The substitute part maintains active product status with confirmed inventory availability while preserving all specified electrical and mechanical parameters.

Q: Are there any package or footprint considerations?

A: No. Both parts use the identical 134-TFBGA package with 10x11.5mm footprint dimensions. PCB designs require no modification for this substitution.

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