74ACT139CW Equivalent & Substitute Parts

Part Overview

The 74ACT139CW is a Decoder/Demultiplexer logic IC with a 1 x 2:4 circuit configuration, manufactured by onsemi. This component features dual independent decoder circuits with 75mA output drive capability per channel. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74ACT139CW

onsemiIn Stock: 112974ACT139CW Datasheet

Current PartRFQ

74ACT139MTC

Fairchild SemiconductorIn Stock: 199774ACT139MTC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT139CW is determined by matching the following critical parameters:

• Functional Type: Decoder/Demultiplexer with 1 x 2:4 circuit configuration
• Independent Circuits: 2 circuits per device
• Voltage Supply Range: 4.5V ~ 5.5V single supply operation
• Operating Temperature Range: -40°C ~ 85°C
• Logic Family: ACT series (Advanced CMOS Technology)

The 74ACT139MTC qualifies as a functional equivalent based on identical circuit configuration, voltage supply specifications, and operating temperature range. Both devices implement the same 1 x 2:4 decoder logic with dual independent circuits and are compatible within ACT series logic systems.

Parameter Comparison

Engineering Selection Recommendations

The 74ACT139MTC is an active production equivalent for the obsolete 74ACT139CW. Both devices share identical functional specifications, voltage supply parameters, and operating temperature ranges, establishing direct substitution compatibility at the logic level.

The primary design consideration is output current capability. The 74ACT139CW provides 75mA output drive per channel, while the 74ACT139MTC provides 24mA. Applications requiring the full 75mA output current must account for this reduction in drive capability when implementing the substitute part.

Package format differs between the two devices: the original uses a Die package, while the substitute uses a 16-TSSOP package. This distinction affects board-level integration and assembly processes but does not impact functional equivalence.

The 74ACT139MTC carries active product status with current manufacturing support, providing supply chain continuity for the obsolete 74ACT139CW.

Frequently Asked Questions (FAQ)

Q: Can the 74ACT139MTC directly replace the 74ACT139CW in existing designs?

A: The 74ACT139MTC is functionally equivalent for logic operation. The primary design consideration is output current: the substitute provides 24mA versus the original 75mA per channel. Verify that downstream load requirements do not exceed 24mA per output before implementing this substitution.

Q: What is the difference between the Die package and 16-TSSOP package?

A: The Die package is a bare semiconductor die requiring specialized handling and assembly. The 16-TSSOP is a standard surface-mount package with leads. The 16-TSSOP is suitable for conventional PCB assembly processes and provides standard handling characteristics.

Q: Are the voltage supply and temperature specifications identical?

A: Yes. Both the 74ACT139CW and 74ACT139MTC operate across 4.5V to 5.5V supply voltage and -40°C to 85°C temperature range, ensuring compatibility in these critical parameters.

Q: Why is the 74ACT139CW classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The 74ACT139MTC provides continued access to this decoder/demultiplexer function through an active equivalent.

Q: Are there any compliance or certification differences?

A: The 74ACT139CW carries REACH Unaffected status. The 74ACT139MTC is classified under ECCN EAR99. Verify compliance requirements for your specific application and regulatory jurisdiction.