74F299SC Shift Register: Equivalent & Substitute Parts

Part Overview

The 74F299SC is an 8-bit universal shift/storage register manufactured by onsemi in a 20-SOIC surface mount package. This logic component operates within the 4.5V to 5.5V supply voltage range and supports tri-state output configuration. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

74F299SC

onsemiIn Stock: 117174F299SC Datasheet

Current PartRFQ

SN74F299DWR

Texas InstrumentsIn Stock: 3141SN74F299DWR Datasheet

SimilarRFQ

SN74F299NS

Texas InstrumentsIn Stock: 1709SN74F299NS Datasheet

SimilarRFQ

SN74ALS299DW

Texas InstrumentsIn Stock: 1038SN74ALS299DW Datasheet

Parametric EquivalentRFQ

SN74F299DW

Texas InstrumentsIn Stock: 1560SN74F299DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F299SC are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates maintain identical functional specifications: 8-bit universal shift register architecture, tri-state output capability, and 4.5V to 5.5V supply voltage operation. Operating temperature range (0°C to 70°C) is preserved across all substitutes.

Mechanical compatibility is determined by package type. The primary substitutes utilize the 20-SOIC package (0.295", 7.50mm width), ensuring direct pin-for-pin compatibility. One substitute employs a 20-SO package variant (0.209", 5.30mm width), which maintains electrical equivalence but requires mechanical layout verification.

Series designation (74F versus 74ALS) indicates logic family differences. The 74F series maintains exact electrical characteristics, while the 74ALS series represents a parametric equivalent with different internal logic family characteristics but identical functional performance within specified voltage and temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

SN74F299DWR (Texas Instruments) provides the most direct replacement path. This part maintains identical 74F series logic family characteristics, operates within the same electrical and thermal specifications, and is available in active production status with ROHS3 compliance. The Tape & Reel packaging format supports automated assembly processes.

SN74F299DW (Texas Instruments) offers equivalent electrical performance within the 74F series but carries Last Time Buy status, indicating limited future availability. This part is suitable for applications where existing inventory can support near-term production requirements.

SN74F299NS (Texas Instruments) maintains 74F series compatibility and active product status. The 20-SO package variant (0.209", 5.30mm width) differs mechanically from the original 20-SOIC specification and requires PCB layout verification before implementation.

SN74ALS299DW (Texas Instruments) represents a parametric equivalent utilizing the 74ALS logic family. This part maintains functional equivalence and operates within identical voltage and temperature ranges. Active production status and ROHS3 compliance support long-term design continuity. Logic family differences require electrical characterization review for timing-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can SN74F299DWR directly replace 74F299SC without PCB modifications?

A: Yes. Both parts utilize the 20-SOIC package (0.295", 7.50mm width) with identical pin configuration and electrical specifications. Direct substitution is supported without layout changes.

Q: What is the difference between 74F and 74ALS series substitutes?

A: Both series maintain identical functional architecture (8-bit universal shift register, tri-state output) and operate within the same 4.5V to 5.5V supply voltage and 0°C to 70°C temperature ranges. The 74ALS series represents a different internal logic family implementation. Electrical timing characteristics may differ; review datasheet timing parameters for applications with critical propagation delay requirements.

Q: Is SN74F299NS compatible with the original 74F299SC?

A: Electrical compatibility is confirmed. The 20-SO package (0.209", 5.30mm width) differs mechanically from the original 20-SOIC specification (0.295", 7.50mm width). PCB footprint verification is required before implementation.

Q: Why is 74F299SC listed as obsolete?

A: The onsemi 74F299SC has reached end-of-life status. Texas Instruments maintains active production of functionally equivalent alternatives (SN74F299DWR, SN74F299NS, SN74ALS299DW), ensuring continued component availability for design support and production requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All Texas Instruments substitute parts listed carry ROHS3 compliance certification. The original onsemi 74F299SC does not specify RoHS status. Verify compliance requirements for your specific application and regulatory jurisdiction.

Q: What packaging formats are available for the substitute parts?

A: SN74F299DWR is supplied in Tape & Reel format for automated assembly. SN74F299DW and SN74F299NS are supplied in Tube packaging. SN74ALS299DW is supplied in Tube packaging. Select packaging format based on production volume and assembly process requirements.