KA319 Equivalent & Substitute Parts

Part Overview

The KA319 is a general-purpose comparator IC manufactured by onsemi, featuring two independent comparator elements in a 14-pin DIP package. The device operates with DTL, Open-Collector, RTL, and TTL output configurations, making it suitable for analog signal comparison applications across industrial and consumer electronics.

The KA319 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support legacy system maintenance where original components are no longer readily available or have reached end-of-life status.

Substiute Parts

KA319

onsemiIn Stock: 2576KA319 Datasheet

Current PartRFQ

LM319N/NOPB

Texas InstrumentsIn Stock: 5460LM319N/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KA319 is determined by strict alignment of the following critical parameters:

Functional Equivalence Criteria:

• Number of comparator elements: 2
• Output type configuration: DTL, Open-Collector, RTL, TTL compatibility
• Input offset voltage: 8mV @ ±15V maximum
• Input bias current: 1µA @ ±15V maximum
• Package form factor: 14-pin DIP (0.300", 7.62mm)
• Mounting technology: Through Hole

Compliance & Regulatory Criteria:

• RoHS3 compliance
• MSL rating: 1 (Unlimited)
• Operating temperature range: 0°C ~ 70°C

The LM319N/NOPB manufactured by Texas Instruments meets all specified functional and compliance requirements, establishing it as a direct substitute for the obsolete KA319.

Parameter Comparison

Engineering Selection Recommendations

The LM319N/NOPB is the qualified substitute for the obsolete KA319 based on the following engineering criteria:

Functional Compatibility: Both devices provide identical input offset voltage (8mV @ ±15V) and input bias current (1µA @ ±15V) specifications, ensuring equivalent signal comparison performance in analog circuits.

Package & Mounting Compatibility: Both devices utilize the 14-pin DIP package with 0.300" (7.62mm) pitch and through-hole mounting technology, enabling direct socket replacement without PCB redesign.

Regulatory & Compliance Alignment: Both parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), satisfying environmental and reliability requirements for industrial and commercial applications.

Product Status Advantage: The LM319N/NOPB maintains active product status with established supply chain availability, providing long-term sourcing reliability compared to the obsolete KA319.

Operational Considerations: The LM319N/NOPB exhibits higher quiescent current (12.5mA vs. 3.6mA) and expanded supply voltage range (5V ~ 36V, ±2.5V ~ 18V), offering enhanced flexibility in power supply design while maintaining backward compatibility with existing KA319 circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can the LM319N/NOPB directly replace the KA319 in existing designs?

A: Yes. Both devices share identical package geometry (14-pin DIP), pin configuration, and critical electrical parameters (input offset voltage, input bias current, operating temperature range). Direct socket replacement is supported without circuit modification.

Q: What are the key differences between the KA319 and LM319N/NOPB?

A: The primary differences are product status (KA319 is obsolete; LM319N/NOPB is active), quiescent current specification (KA319: 3.6mA max; LM319N/NOPB: 12.5mA max), and supply voltage range (LM319N/NOPB supports 5V ~ 36V and ±2.5V ~ 18V). These differences do not affect functional equivalence for standard comparator applications.

Q: Are there any compliance or certification concerns when substituting the LM319N/NOPB for the KA319?

A: No. Both devices maintain ROHS3 compliance and identical MSL ratings (1 - Unlimited), ensuring equivalent environmental and reliability certifications for regulated applications.

Q: Does the higher quiescent current of the LM319N/NOPB affect circuit design?

A: The increased quiescent current (12.5mA vs. 3.6mA) may require power supply capacity review in battery-powered or low-power applications. For standard industrial and consumer applications operating from regulated power supplies, this difference is typically not significant.

Q: What packaging options are available for the LM319N/NOPB?

A: The LM319N/NOPB is supplied in tube packaging. The device maintains the 14-pin DIP form factor required for through-hole PCB assembly, consistent with the original KA319 package specification.