74F148PC Priority Encoder Equivalent & Substitute Parts

Part Overview

The 74F148PC is a priority encoder integrated circuit manufactured by onsemi, designed to encode 8 input lines into a 3-bit binary output. This component belongs to the 74F logic family and is housed in a 16-pin DIP package for through-hole mounting applications.

The 74F148PC is classified as obsolete. Locating equivalent substitute parts is necessary for new designs, production continuity, and system maintenance where original components are no longer readily available or manufactured.

Substiute Parts

74F148PC

onsemiIn Stock: 169874F148PC Datasheet

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SN74HC148N

Texas InstrumentsIn Stock: 13825SN74HC148N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F148PC are identified based on the following critical parameters that determine functional and mechanical compatibility:

• Circuit Configuration: Must be 1 x 8:3 priority encoder
• Package Type: Must be 16-DIP (0.300", 7.62mm) for through-hole mounting
• Functional Equivalence: Must perform identical encoding logic
• Pin Compatibility: Must maintain identical pinout

The SN74HC148N from Texas Instruments meets these substitution criteria. Both devices implement the same 8-to-3 priority encoder function in identical 16-DIP packages. The primary difference lies in the logic family (74HC versus 74F), which affects electrical operating parameters but maintains functional compatibility for most applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC148N is an active, in-production substitute for the obsolete 74F148PC. Both devices share identical functional specifications and package geometry, enabling direct replacement in 16-DIP through-hole applications.

The SN74HC148N offers extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and broader supply voltage tolerance (2V to 6V versus 4.5V to 5.5V). The SN74HC148N is ROHS3 compliant, supporting modern manufacturing and environmental standards.

Output current characteristics differ between the two families. The 74F148PC provides 1mA high and 20mA low output current, while the SN74HC148N provides symmetrical 5.2mA output current. System designs must account for these differences in load-driving capability.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC148N directly replace the 74F148PC in existing designs?

A: Yes, for applications operating within the overlapping supply voltage range (4.5V to 5.5V) and temperature range (0°C to 70°C). The identical 16-DIP package and pinout enable direct mechanical and electrical substitution. Output current differences must be evaluated for specific load requirements.

Q: What is the primary reason for substituting the 74F148PC?

A: The 74F148PC is classified as obsolete. The SN74HC148N is an active product with current manufacturing availability, ensuring supply chain continuity and long-term component sourcing.

Q: Are there differences in logic family behavior between 74F and 74HC?

A: Both families implement identical priority encoder logic. The 74HC family operates at lower power consumption and supports a wider supply voltage range. Propagation delay and switching characteristics may differ; consult detailed datasheets for timing-critical applications.

Q: Is the SN74HC148N suitable for new designs?

A: Yes. The SN74HC148N is an active product with ROHS3 compliance, making it appropriate for new designs requiring priority encoder functionality in 16-DIP through-hole packages.

Q: What packaging options are available for the SN74HC148N?

A: The SN74HC148N is supplied in tube packaging. The 16-DIP package maintains compatibility with through-hole PCB assembly processes.