74ACT11257N Equivalent & Substitute Parts

Part Overview

The 74ACT11257N is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 20-pin DIP package. This component is classified as obsolete, indicating it is no longer in active production. The 74ACT11257N operates with single supply voltage (4.5V ~ 5.5V) and is designed for through-hole mounting applications. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is essential for ongoing system maintenance and new design implementations.

Substiute Parts

74ACT11257N

Texas InstrumentsIn Stock: 85774ACT11257N Datasheet

Current PartRFQ

74AC11257N

Texas InstrumentsIn Stock: 501674AC11257N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT11257N is determined by functional and electrical equivalence within the 74-series logic family. The primary substitute is the 74AC11257N, which maintains identical circuit configuration (4 x 2:1 multiplexer), independent circuit count (1), output current specifications (24mA, 24mA), operating temperature range (-40°C ~ 85°C), mounting type (through hole), and package format (20-DIP).

The key substitution criteria are:

• Identical multiplexer circuit configuration (4 x 2:1)
• Matching output current drive capability (24mA high and low)
• Compatible package and pinout (20-DIP)
• Overlapping operating temperature range
• Through-hole mounting compatibility

The 74AC11257N differs from the 74ACT11257N in supply voltage range and product status, representing an active production alternative suitable for new designs and replacements.

Parameter Comparison

Engineering Selection Recommendations

The 74AC11257N is the direct substitute for the 74ACT11257N. Both components share identical functional specifications and package geometry, ensuring direct replacement capability at the circuit board level.

The 74AC11257N offers two significant advantages over the obsolete 74ACT11257N:

1. Active Production Status: The 74AC11257N maintains active product status with substantially higher inventory availability (4918 pcs vs. 752 pcs), ensuring reliable procurement for both immediate replacements and future production runs.

2. Regulatory Compliance: The 74AC11257N achieves ROHS3 compliance, meeting current environmental and regulatory requirements for new equipment designs and system upgrades.

The 74AC11257N operates across an extended supply voltage range (3V ~ 5.5V) compared to the 74ACT11257N (4.5V ~ 5.5V), providing additional design flexibility for systems operating at lower supply voltages while maintaining full compatibility within the standard 5V logic domain.

Frequently Asked Questions (FAQ)

Q: Can the 74AC11257N directly replace the 74ACT11257N without circuit modifications?

A: Yes. Both components feature identical 4 x 2:1 multiplexer configuration, matching output current specifications (24mA), identical 20-DIP package geometry, and overlapping operating temperature ranges. Direct pin-for-pin substitution is supported.

Q: What is the primary difference between the 74ACT11257N and 74AC11257N?

A: The 74AC11257N operates across a wider supply voltage range (3V ~ 5.5V) compared to the 74ACT11257N (4.5V ~ 5.5V). Additionally, the 74AC11257N is in active production with ROHS3 compliance, while the 74ACT11257N is obsolete and RoHS non-compliant.

Q: Are there any compatibility concerns when substituting the 74AC11257N for the 74ACT11257N?

A: No compatibility concerns exist for standard 5V logic applications. The extended lower voltage range of the 74AC11257N (down to 3V) provides additional operational flexibility. Both components maintain identical output current drive capability and package specifications.

Q: What packaging options are available for the 74AC11257N?

A: The 74AC11257N is supplied in tube packaging. The component maintains the same 20-DIP (0.300", 7.62mm) package format as the 74ACT11257N, ensuring mechanical compatibility with existing through-hole PCB designs.

Q: Why should new designs use the 74AC11257N instead of the 74ACT11257N?

A: New designs should specify the 74AC11257N based on active production status, ROHS3 regulatory compliance, and superior long-term availability. The 74ACT11257N is obsolete and subject to supply discontinuation.