74F193SCX Binary Counter IC - Equivalent & Substitute Parts

Part Overview

The 74F193SCX is a 4-bit binary counter IC manufactured by onsemi, designed for up/down counting applications with positive edge triggering. This component operates at a maximum count rate of 125 MHz and is housed in a 16-SOIC surface mount package. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations where legacy compatibility is required.

Substiute Parts

74F193SCX

onsemiIn Stock: 371474F193SCX Datasheet

Current PartRFQ

SN74LS193D

onsemiIn Stock: 16628SN74LS193D Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74F193SCX is determined by the following core electrical and mechanical parameters:

• Logic Function: Binary counter with 4-bit capacity, up/down counting capability, and asynchronous reset
• Package Compatibility: 16-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm width)
• Trigger Mechanism: Positive edge triggering for clock input
• Supply Voltage Range: 4.5 V to 5.5 V operation
• Operating Temperature Range: 0°C to 70°C
• Pin Configuration: Identical pinout required for direct replacement

The SN74LS193D meets these core substitution criteria, maintaining functional equivalence in counter operation, package form factor, and basic electrical specifications. Differences in count rate and timing characteristics do not preclude substitution in applications where the lower maximum frequency of the LS variant is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the 74F193SCX and SN74LS193D are classified as obsolete products. Selection between these parts should be based on the following criteria:

74F193SCX Selection: Choose this part for applications requiring the maximum specified count rate of 125 MHz. The 74F variant offers higher speed performance and operates across a broader supply voltage range (4.5 V to 5.5 V).

SN74LS193D Selection: This substitute is suitable for applications where the maximum count rate of 32 MHz meets system requirements. The 74LS variant operates within a narrower supply voltage window (4.75 V to 5.25 V). The SN74LS193D is noted as RoHS non-compliant, which may impact suitability for applications subject to RoHS regulations.

Both parts maintain identical functional behavior for counter operation, asynchronous reset, and up/down counting direction. Package compatibility and pinout equivalence enable direct physical replacement in 16-SOIC footprints.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS193D directly replace the 74F193SCX in all applications?

A: Direct replacement is possible from a functional and physical standpoint, as both parts share identical 4-bit binary counter logic, asynchronous reset capability, and 16-SOIC package dimensions. However, the SN74LS193D operates at a maximum count rate of 32 MHz compared to the 74F193SCX's 125 MHz. Substitution is valid only in applications where this lower frequency specification is acceptable.

Q: What are the supply voltage differences between these parts?

A: The 74F193SCX operates across 4.5 V to 5.5 V, while the SN74LS193D operates across 4.75 V to 5.25 V. The 74F variant accommodates a wider voltage range. Systems operating at the lower end of the 4.5 V to 4.75 V window require the 74F193SCX.

Q: Are there compliance or regulatory differences?

A: The SN74LS193D is marked as RoHS non-compliant. Applications subject to RoHS requirements should use the 74F193SCX or verify compliance status with the manufacturer before selection.

Q: Is the 16-SOIC package identical between both parts?

A: Yes. Both parts use the 16-SOIC (0.154", 3.90mm width) surface mount package with identical pinout and physical dimensions, enabling direct PCB footprint compatibility.

Q: What is the moisture sensitivity level for these parts?

A: The 74F193SCX carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. Equivalent MSL information for the SN74LS193D was not provided in the available specifications.