SN74ACT7806-25DL Equivalent & Substitute Parts

Part Overview

The SN74ACT7806-25DL is an asynchronous FIFO (First-In-First-Out) memory circuit manufactured by Texas Instruments, designed for high-speed data buffering applications. This device provides 4.5K bits of storage (256 x 18 configuration) with uni-directional bus architecture and operates at 40MHz with 18ns access time. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

SN74ACT7806-25DL

Texas InstrumentsIn Stock: 908SN74ACT7806-25DL Datasheet

Current PartRFQ

SN74ACT7806-40DL

Texas InstrumentsIn Stock: 2149SN74ACT7806-40DL Datasheet

MFR RecommendedRFQ

SN74ALVC7806-25DL

Texas InstrumentsIn Stock: 1186SN74ALVC7806-25DL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74ACT7806-25DL is determined by the following critical parameters:

• Memory Configuration: Must maintain 4.5K (256 x 18) capacity
• FIFO Function: Must be asynchronous FIFO architecture
• Bus Architecture: Must be uni-directional
• Package Compatibility: Must use 56-BSSOP surface mount package
• Electrical Interface: Supply voltage and current characteristics must be compatible with system requirements
• Performance Characteristics: Data rate and access time determine functional equivalence

Two substitute parts meet these criteria with specific trade-offs in performance and supply voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT7806-40DL is the manufacturer-recommended substitute within the 74ACT series. This part maintains identical supply voltage specifications (4.5V ~ 5.5V) and current characteristics (400µA maximum), ensuring direct compatibility with existing 5V logic systems. The trade-off is reduced data rate (25MHz versus 40MHz) and slightly increased access time (20ns versus 18ns). This part is currently in active production status, providing long-term availability and supply chain stability.

SN74ALVC7806-25DL provides an alternative substitute with performance characteristics matching the original part (40MHz data rate, 18ns access time) but operates at a lower supply voltage range (3V ~ 3.6V) with significantly reduced current consumption (40µA maximum). This part is suitable for low-voltage applications and power-constrained systems. The 74ALVC series is also in active production status. System integration requires voltage level compatibility verification.

Both substitute parts maintain identical memory configuration, FIFO function, uni-directional bus architecture, and 56-BSSOP package format, ensuring mechanical and functional compatibility at the board level.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT7806-40DL be used as a direct replacement for SN74ACT7806-25DL?

A: Yes, within the same 5V logic family. Both parts share identical supply voltage (4.5V ~ 5.5V), current specifications (400µA), memory configuration (4.5K), and package format (56-BSSOP). The reduced data rate (25MHz) and slightly increased access time (20ns) must be evaluated against system timing requirements.

Q: What is the primary difference between SN74ACT7806-40DL and SN74ALVC7806-25DL?

A: The SN74ACT7806-40DL operates at 5V logic levels (4.5V ~ 5.5V) with 400µA current draw, while the SN74ALVC7806-25DL operates at 3.3V logic levels (3V ~ 3.6V) with 40µA current draw. The ALVC variant matches the original part's performance (40MHz, 18ns) but requires voltage compatibility verification in the target system.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 56-BSSOP package with identical pinout, enabling direct PCB-level substitution without layout modifications.

Q: Which substitute should be selected for a new design?

A: Selection depends on system voltage requirements. For 5V systems, SN74ACT7806-40DL provides manufacturer-recommended continuity. For 3.3V systems or low-power applications, SN74ALVC7806-25DL is appropriate. Both are in active production status.

Q: What compliance certifications apply to these parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Moisture sensitivity level is 1 (unlimited) for all variants.