Equivalent & Substitute Parts for 71321LA55PF

Part Overview

The 71321LA55PF is a 16Kbit dual-port asynchronous SRAM manufactured by Renesas Electronics Corporation in a 64-TQFP surface mount package. This device features a 55 ns access time and parallel memory interface with 2K x 8 organization. The part is classified as obsolete, making identification of compatible alternatives essential for ongoing system support and new design implementations. Substitute parts must maintain electrical compatibility across memory capacity, interface type, voltage supply range, and thermal operating conditions while potentially offering improved performance characteristics or active product status.

Key Parameters

Parameter	Value
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Format	SRAM
Technology	SRAM - Dual Port, Asynchronous
Memory Interface	Parallel
Package / Case	64-LQFP
Supplier Device Package	64-TQFP (14x14)
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the 71321LA55PF is determined by strict equivalence across the following critical parameters:

Memory Capacity & Organization: Substitute parts must provide identical 16Kbit capacity with 2K x 8 organization to ensure address and data bus compatibility
Memory Technology: Dual-port asynchronous SRAM architecture is mandatory for functional equivalence
Parallel Interface: Memory interface must remain parallel to maintain signal-level compatibility with existing circuit designs
Package Footprint: 64-TQFP (14x14) package is required for PCB layout compatibility
Voltage Supply Range: 4.5V ~ 5.5V supply voltage compatibility ensures operation within the same power distribution system
Operating Temperature Range: 0°C ~ 70°C thermal envelope must be maintained for system reliability

The 71321LA20PFG qualifies as a direct substitute based on full compliance with all mandatory parameters. Performance differentiation exists only in access time specification, where the substitute offers improved speed characteristics without altering functional or physical compatibility.

Parameter Comparison

Parameter	71321LA55PF (Main Part)	71321LA20PFG (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Size	16Kbit	16Kbit
Memory Organization	2K x 8	2K x 8
Memory Format	SRAM	SRAM
Technology	SRAM - Dual Port, Asynchronous	SRAM - Dual Port, Asynchronous
Memory Interface	Parallel	Parallel
Access Time	55 ns	20 ns
Write Cycle Time - Word, Page	55 ns	20 ns
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	64-LQFP	64-LQFP
Supplier Device Package	64-TQFP (14x14)	64-TQFP (14x14)
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 71321LA20PFG is a qualified substitute for the 71321LA55PF based on complete electrical and mechanical parameter equivalence. Selection of the substitute part is supported by the following factors:

Product Status: The main part is classified as obsolete, while the substitute maintains active product status, ensuring long-term availability and supply chain continuity
Regulatory Compliance: The substitute achieves ROHS3 compliance, whereas the main part is non-compliant, aligning with current environmental and regulatory requirements
Performance Enhancement: The substitute provides improved access time (20 ns versus 55 ns) and write cycle time, delivering superior performance within the same physical and electrical constraints
Identical Packaging: Both parts utilize the 64-TQFP (14x14) package, eliminating PCB redesign requirements
Voltage and Thermal Compatibility: Identical supply voltage range and operating temperature specifications ensure direct circuit compatibility

Frequently Asked Questions (FAQ)

Q: Can the 71321LA20PFG be used as a direct replacement for the 71321LA55PF in existing designs?

A: Yes. The substitute part maintains identical memory capacity (16Kbit), organization (2K x 8), package footprint (64-TQFP 14x14), voltage supply range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). No circuit modifications or PCB layout changes are required.

Q: What is the primary difference between these two parts?

A: The primary difference is access time and write cycle time. The 71321LA20PFG operates at 20 ns, compared to 55 ns for the 71321LA55PF. This represents improved performance with no change to functional or physical characteristics.

Q: Are there any compliance differences between the main part and substitute?

A: Yes. The 71321LA20PFG is ROHS3 compliant, while the 71321LA55PF is RoHS non-compliant. Both parts maintain identical MSL rating (3, 168 Hours) and REACH unaffected status.

Q: Why is the main part listed as obsolete?

A: Obsolete status indicates the part is no longer in active production. The 71321LA20PFG, as an active product from the same manufacturer and base product family, provides continuity for applications requiring 16Kbit dual-port asynchronous SRAM in 64-TQFP packaging.

Q: Are the pin configurations identical between these parts?

A: Yes. Both parts use the 64-TQFP (14x14) package with identical pinout, ensuring direct socket compatibility and eliminating the need for board redesign.

Q: What is the MSL rating, and does it differ between parts?

A: Both parts carry MSL rating 3 with a 168-hour moisture sensitivity window. Identical MSL ratings ensure equivalent handling, storage, and reflow requirements.

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