SN74LS669NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS669NG4 is a 4-bit binary counter IC manufactured by Texas Instruments, designed for synchronous counting applications with up/down direction control. This component operates at a count rate of 32 MHz with positive edge triggering and asynchronous reset functionality. The device is classified as obsolete, making equivalent substitute parts necessary for ongoing production, maintenance, and legacy system support where original stock is unavailable or depleted.

Substiute Parts

SN74LS669NG4

Texas InstrumentsIn Stock: 718SN74LS669NG4 Datasheet

Current PartRFQ

SN74LS193N

onsemiIn Stock: 6160SN74LS193N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS669NG4 is determined by strict equivalence across the following critical parameters:

• Logic Function: Binary counter with 4-bit capacity
• Directional Control: Up and down counting capability
• Electrical Characteristics: 32 MHz count rate, positive edge triggering, asynchronous reset
• Supply Voltage Range: 4.75 V to 5.25 V
• Operating Temperature Range: 0°C to 70°C
• Package Configuration: 16-DIP through-hole mounting with 0.300" (7.62mm) pitch

The SN74LS193N from onsemi meets all functional and electrical requirements for direct substitution. Both devices share identical logic specifications, timing characteristics, and physical packaging, enabling pin-for-pin replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the SN74LS669NG4 and SN74LS193N are classified as obsolete products. Selection between these devices should be based on availability and compliance requirements:

The SN74LS669NG4 (Texas Instruments) carries ROHS3 compliance certification, making it suitable for applications subject to RoHS regulations. Current inventory of 705 pieces is available.

The SN74LS193N (onsemi) is RoHS non-compliant but offers significantly higher inventory availability at 6,100 pieces. This substitute is appropriate for legacy system repairs, non-regulated applications, or situations where RoHS compliance is not a requirement.

Both devices are classified under ECCN EAR99 and share identical HTSUS coding (8542.39.0001), confirming functional and regulatory equivalence for export and procurement purposes.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS193N directly replace the SN74LS669NG4 in existing circuits?

A: Yes. Both devices are pin-for-pin equivalents with identical electrical specifications, logic function, and 16-DIP package configuration. No circuit modifications are required for substitution.

Q: What is the primary difference between these two parts?

A: The SN74LS669NG4 is RoHS3 compliant, while the SN74LS193N is RoHS non-compliant. Functionally and electrically, they are equivalent. Compliance requirements should determine which part is appropriate for your application.

Q: Are there any timing or performance differences between these substitutes?

A: No. Both devices operate at 32 MHz count rate with identical positive edge triggering, asynchronous reset, and synchronous timing characteristics. Performance is equivalent across all specified parameters.

Q: Why are both parts classified as obsolete?

A: Both the SN74LS669NG4 and SN74LS193N are legacy 74LS series logic components. Manufacturers have transitioned to newer logic families. Obsolete status indicates these parts are no longer in active production, making substitute sourcing necessary for ongoing applications.

Q: Does package type affect substitution eligibility?

A: No. Both parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging. Physical and electrical compatibility is confirmed. Mounting and PCB layout requirements are identical.

Q: What supply voltage range do these devices support?

A: Both the SN74LS669NG4 and SN74LS193N operate within a 4.75 V to 5.25 V supply voltage range. Standard 5V logic supply is appropriate for both devices.