AS7C1024B-20TCN Equivalent & Substitute Parts

Part Overview

The AS7C1024B-20TCN is a 1Mbit asynchronous SRAM memory IC manufactured by Alliance Memory, Inc., configured as 128K x 8 with parallel interface and 20 ns access time. The device is housed in a 32-TFSOP surface mount package and operates across the 4.5V to 5.5V supply voltage range at temperatures from 0°C to 70°C. This part maintains Active product status and carries ROHS3 compliance certification.

Equivalent and substitute parts are identified when designs require alternative sourcing due to inventory constraints, lead time considerations, or operational parameter adjustments within acceptable design margins.

Key Parameters

Parameter	Value
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	Parallel
Access Time	20 ns
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-TFSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AS7C1024B-20TCN is determined by strict parameter matching across the following critical dimensions:

Memory Capacity & Organization: All substitute parts must maintain 1Mbit capacity with 128K x 8 organization and parallel interface to ensure functional equivalence at the system level.

Package Compatibility: All substitutes utilize the 32-TFSOP surface mount package with identical 0.724" width (18.40mm), ensuring PCB layout compatibility without redesign.

Access Time Tolerance: The main part specifies 20 ns access time. Substitutes with equal or faster access times (12 ns) are electrically compatible. Substitutes with slower access times (35 ns, 55 ns) remain functionally compatible in systems where timing margins permit.

Voltage Supply Range: Substitutes must support the 4.5V to 5.5V range required by the main part. Substitutes with extended ranges (2.7V to 5.5V) provide additional operational flexibility while maintaining full compatibility.

Operating Temperature Range: The main part operates 0°C to 70°C. Substitutes with extended ranges (-40°C to 85°C) provide enhanced environmental capability while remaining compatible within the original specification window.

Compliance & Certification: All substitutes carry ROHS3 compliance and REACH Unaffected status, matching the regulatory posture of the main part.

Parameter Comparison

Parameter	AS7C1024B-20TCN	AS7C1024B-12TCN	AS6C1008-55TIN	IS61C1024AL-12TLI	IS62C1024AL-35TLI	IS62C1024AL-35TLI-TR
Manufacturer	Alliance Memory	Alliance Memory	Alliance Memory	ISSI	ISSI	ISSI
Memory Size	1Mbit	1Mbit	1Mbit	1Mbit	1Mbit	1Mbit
Organization	128K x 8	128K x 8	128K x 8	128K x 8	128K x 8	128K x 8
Access Time	20 ns	12 ns	55 ns	12 ns	35 ns	35 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	2.7V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	32-TFSOP	32-TFSOP	32-TFSOP	32-TFSOP	32-TFSOP	32-TFSOP
Packaging Format	Tray	Tray	Tray	Tray	Tray	Tape & Reel
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	948 Pcs	1156 Pcs	1540 Pcs	4076 Pcs	7986 Pcs	15800 Pcs

Engineering Selection Recommendations

AS7C1024B-12TCN (Alliance Memory): Faster access time (12 ns) with identical voltage and temperature specifications to the main part. Maintains Alliance Memory manufacturer continuity. Suitable for designs requiring improved timing performance within the same operating envelope.

AS6C1008-55TIN (Alliance Memory): Extended voltage range (2.7V to 5.5V) and extended temperature range (-40°C to 85°C) provide operational flexibility beyond the main part specification. Slower access time (55 ns) requires verification of system timing margins. Maintains Alliance Memory sourcing.

IS61C1024AL-12TLI (ISSI): Faster access time (12 ns) with extended temperature range (-40°C to 85°C). Voltage supply matches main part (4.5V to 5.5V). Introduces ISSI as alternative manufacturer with high inventory availability (4076 Pcs).

IS62C1024AL-35TLI (ISSI): Moderate access time (35 ns) with extended temperature range (-40°C to 85°C). Voltage supply matches main part. Tray packaging format. Highest inventory among ISSI options (7986 Pcs).

IS62C1024AL-35TLI-TR (ISSI): Identical electrical specifications to IS62C1024AL-35TLI with Tape & Reel packaging format. Largest inventory availability (15800 Pcs). Suitable for high-volume production environments requiring continuous feed packaging.

All substitute parts carry Active product status and ROHS3 compliance, ensuring regulatory alignment with the main part.

Frequently Asked Questions (FAQ)

Q: Can AS7C1024B-12TCN replace AS7C1024B-20TCN directly?

A: Yes. The AS7C1024B-12TCN provides faster access time (12 ns versus 20 ns) while maintaining identical voltage supply (4.5V to 5.5V) and temperature range (0°C to 70°C). Faster memory is backward compatible in systems designed for the original 20 ns specification.

Q: What is the impact of using AS6C1008-55TIN with its 55 ns access time?

A: The AS6C1008-55TIN has slower access time than the main part. Substitution requires verification that system timing margins accommodate the additional 35 ns delay. The extended voltage range (2.7V to 5.5V) and temperature range (-40°C to 85°C) provide operational advantages in other dimensions.

Q: Are ISSI parts (IS61C1024AL-12TLI, IS62C1024AL-35TLI) fully compatible?

A: Yes. ISSI parts maintain identical memory capacity (1Mbit), organization (128K x 8), parallel interface, and 32-TFSOP package. Voltage supply and temperature ranges match or exceed the main part specification. Manufacturer change from Alliance Memory to ISSI does not affect functional compatibility.

Q: What is the difference between IS62C1024AL-35TLI and IS62C1024AL-35TLI-TR?

A: Both parts are electrically identical with 35 ns access time and extended temperature range (-40°C to 85°C). The primary difference is packaging format: IS62C1024AL-35TLI uses Tray packaging, while IS62C1024AL-35TLI-TR uses Tape & Reel format. Tape & Reel packaging is standard for automated assembly lines and high-volume production.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. All substitute parts carry ROHS3 Compliant certification and REACH Unaffected status, matching the regulatory compliance of the main part.

Q: Which substitute offers the best inventory availability?

A: IS62C1024AL-35TLI-TR provides the highest inventory (15800 Pcs) with Tape & Reel packaging suitable for production environments. IS62C1024AL-35TLI offers 7986 Pcs in Tray format for smaller volume requirements.

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