KA319D Equivalent & Substitute Parts

Part Overview

The KA319D is a general-purpose comparator IC manufactured by onsemi, featuring dual comparators in a 14-SOIC surface-mount package. This device implements DTL, Open-Collector, RTL, and TTL output configurations suitable for analog signal comparison applications. The KA319D is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives from major manufacturers provide functional equivalence with extended product lifecycles and improved availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	KA319D
Manufacturer	onsemi
Category	Linear
Description	IC COMPARATOR 2 GEN PUR 14SOP
Type	General Purpose
Number of Elements	2
Output Type	DTL, Open-Collector, RTL, TTL
Voltage - Input Offset (Max)	8mV @ ±15V
Current - Input Bias (Max)	1µA @ ±15V
Current - Output (Typ)	25mA
Current - Quiescent (Max)	3.6mA
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the KA319D is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 14-SOIC (0.154", 3.90mm Width) surface-mount packaging to ensure PCB footprint compatibility
Functional Equivalence: Dual-element general-purpose comparator configuration with Open-Collector and TTL output capability
Electrical Specifications: Input offset voltage, input bias current, and output current ratings must support the original application requirements
Operating Temperature Range: Substitute parts must cover or exceed the 0°C ~ 70°C operating range
Compliance Standards: RoHS3 compliance and MSL 1 rating required for manufacturing and storage compatibility

The substitute parts listed below meet these criteria and are sourced from active product lines, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	KA319D (onsemi)	LM219DT (STMicroelectronics)	LM319AM/NOPB (Texas Instruments)	LM319AMX/NOPB (Texas Instruments)	LM319DT (STMicroelectronics)	LM319M (National Semiconductor)	LM319M/NOPB (Texas Instruments)	LM319MX/NOPB (Texas Instruments)
Number of Elements	2	2	2	2	2	2	2	2
Output Type	DTL, Open-Collector, RTL, TTL	Open-Collector, Open-Emitter, TTL	DTL, Open-Collector, Open-Emitter, RTL, TTL	DTL, Open-Collector, Open-Emitter, RTL, TTL	Open-Collector, Open-Emitter, TTL	DTL, Open-Collector, Open-Emitter, RTL, TTL	DTL, Open-Collector, Open-Emitter, RTL, TTL	DTL, Open-Collector, Open-Emitter, RTL, TTL
Voltage - Input Offset (Max)	8mV @ ±15V	4mV @ ±15V	1mV @ ±15V	1mV @ ±15V	8mV @ ±15V	8mV @ ±15V	8mV @ ±15V	8mV @ ±15V
Current - Input Bias (Max)	1µA @ ±15V	0.5µA @ ±15V	0.5µA @ ±15V	0.5µA @ ±15V	1µA @ ±15V	1µA @ ±15V	1µA @ ±15V	1µA @ ±15V
Current - Output (Typ)	25mA	—	—	—	—	25mA	—	—
Current - Quiescent (Max)	3.6mA	11.5mA	12.5mA	12.5mA	12.5mA	12.5mA	12.5mA	12.5mA
Operating Temperature	0°C ~ 70°C	-40°C ~ 105°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

LM319DT (STMicroelectronics) and LM319M (National Semiconductor) provide direct electrical and functional equivalence to the KA319D. Both devices match the input offset voltage (8mV @ ±15V), input bias current (1µA @ ±15V), and output current specifications (25mA typical). These parts maintain the 0°C ~ 70°C operating temperature range and are available in active product status with ROHS3 compliance and MSL 1 ratings.

Secondary Substitutes (Enhanced Specifications)

LM319AM/NOPB, LM319AMX/NOPB, LM319M/NOPB, and LM319MX/NOPB (Texas Instruments) offer superior input offset voltage performance (1mV @ ±15V) and extended supply voltage ranges (5V ~ 36V, ±2.5V ~ 18V). These devices are suitable for applications requiring tighter input offset specifications. All are active products with full compliance certifications.

Alternative with Extended Temperature Range

LM219DT (STMicroelectronics) operates across -40°C ~ 105°C, providing extended temperature coverage beyond the KA319D specification. This device features improved input bias current (0.5µA @ ±15V) and is recommended for applications requiring broader environmental operating conditions.

Availability and Supply Chain Considerations

All substitute parts are sourced from active product lines with substantial inventory levels. LM319MX/NOPB (Texas Instruments) maintains the highest inventory (16,674 pcs), followed by LM219DT (STMicroelectronics) with 20,974 pcs. These high-volume alternatives ensure supply chain stability for production and design continuity.

Frequently Asked Questions (FAQ)

Q: Can I directly replace KA319D with any of the listed substitutes?

A: Yes, all listed substitutes are pin-compatible and functionally equivalent within the specified electrical parameters. The 14-SOIC package footprint is identical across all parts, enabling direct PCB substitution without layout modifications.

Q: What is the difference between LM319 variants (M, AM, MX, AMX)?

A: The suffix designations indicate packaging and temperature grade variations. "M" denotes standard temperature range (0°C ~ 70°C), while "AM" indicates the same temperature range with enhanced specifications. "MX" and "AMX" refer to tape-and-reel packaging for automated assembly, while "M" and "AM" are supplied in tube packaging. All variants maintain identical electrical performance within their respective grades.

Q: Which substitute offers the best input offset voltage performance?

A: LM319AM/NOPB and LM319AMX/NOPB (Texas Instruments) provide the lowest input offset voltage at 1mV @ ±15V, compared to 8mV for the KA319D. This enhanced specification is beneficial for precision analog comparison applications requiring tighter input accuracy.

Q: Is LM219DT suitable for my application if I need extended temperature operation?

A: LM219DT operates from -40°C ~ 105°C, exceeding the KA319D's 0°C ~ 70°C range. However, verify that your application requires this extended range, as it may introduce unnecessary cost. The device maintains electrical equivalence within the overlapping temperature window (0°C ~ 70°C).

Q: Are all substitutes RoHS3 compliant?

A: All listed substitutes except LM319M (National Semiconductor) carry explicit ROHS3 compliance certification. LM319M compliance status is not specified in the provided data. For applications requiring mandatory RoHS3 compliance, select from LM219DT, LM319AM/NOPB, LM319AMX/NOPB, LM319DT, LM319M/NOPB, or LM319MX/NOPB.

Q: What is the MSL rating, and why does it matter?

A: Moisture Sensitivity Level (MSL) 1 indicates unlimited shelf life without moisture-control packaging requirements. All listed substitutes carry MSL 1 ratings, matching the KA319D specification. This eliminates special storage or handling procedures during manufacturing and assembly.

Q: Can I use LM319MX/NOPB in tape-and-reel format for manual assembly?

A: LM319MX/NOPB is supplied in cut-tape and digi-reel format, designed for automated pick-and-place assembly. For manual assembly applications, select tube-packaged alternatives such as LM319M/NOPB or LM319AM/NOPB.

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