KA339 Equivalent & Substitute Parts

Part Overview

The KA339 is a general-purpose comparator IC manufactured by onsemi, featuring four independent comparators in a 14-DIP package. This device supports multiple output types including DTL, MOS, Open-Collector, and TTL configurations, with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The KA339 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

KA339

onsemiIn Stock: 1532KA339 Datasheet

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LM339DR2G

onsemiIn Stock: 205270LM339DR2G Datasheet

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LM339AN

Harris CorporationIn Stock: 15713LM339AN Datasheet

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LM339N

STMicroelectronicsIn Stock: 124922LM339N Datasheet

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LM339N/NOPB

Texas InstrumentsIn Stock: 3087LM339N/NOPB Datasheet

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LM339NE3

Texas InstrumentsIn Stock: 18050LM339NE3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KA339 is determined by the following critical parameters:

• Number of Elements: Must be 4 independent comparators
• Output Type: Must support Open-Collector configuration (common to all substitutes)
• Voltage - Supply Range: Must encompass or exceed 2V ~ 36V (single) and ±1V ~ ±18V (dual)
• Voltage - Input Offset (Max): Must not exceed 5mV @ specified voltage
• Current - Input Bias (Max): Must not exceed 0.25µA @ 5V
• Current - Output (Typ): Must support minimum 16mA @ 5V
• Current - Quiescent (Max): Must not exceed 2.5mA
• Operating Temperature: Must support 0°C ~ 70°C range
• Package Compatibility: 14-DIP through-hole packages are directly interchangeable; 14-SOIC surface-mount variants require PCB redesign

The substitute parts are grouped into two categories:

Category 1: Direct Pin-Compatible Replacements (14-DIP Through-Hole)

• LM339AN (Harris Corporation)
• LM339N (STMicroelectronics)
• LM339N/NOPB (Texas Instruments)
• LM339NE3 (Texas Instruments)

Category 2: Functional Equivalent (Surface-Mount Alternative)

• LM339DR2G (onsemi, 14-SOIC)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Through-Hole, 14-DIP):

LM339N/NOPB (Texas Instruments) is the preferred substitute. This part maintains full pin compatibility with the KA339, supports the complete supply voltage range (2V ~ 36V, ±1V ~ ±18V), and holds active product status with ROHS3 compliance. The extended operating temperature range (-25°C ~ 85°C) provides additional margin beyond the KA339 specification.

LM339NE3 (Texas Instruments) is an alternative for through-hole applications. It meets all critical electrical parameters and maintains ROHS3 compliance with active product status. Note that the supply voltage range is slightly reduced (2V ~ 30V, ±1V ~ ±15V), which may limit use in applications requiring the full 36V upper limit.

LM339N (STMicroelectronics) is functionally equivalent but classified as obsolete. While ROHS3 compliant, its obsolete status makes it less suitable for new designs requiring long-term availability.

LM339AN (Harris Corporation) is not recommended for new designs due to RoHS non-compliance and obsolete product status.

For Surface-Mount Applications:

LM339DR2G (onsemi, 14-SOIC) provides functional equivalence with active product status and ROHS3 compliance. This part requires PCB redesign for surface-mount implementation. The minimum supply voltage is raised to 3V (versus 2V for through-hole variants), which may affect low-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can I use LM339N/NOPB as a direct replacement for KA339 without PCB modifications?

A: Yes. LM339N/NOPB maintains identical pin configuration and 14-DIP through-hole package dimensions. No PCB layout changes are required. Electrical parameters are compatible across the specified operating range.

Q: What is the key difference between the 14-DIP and 14-SOIC package options?

A: The 14-DIP package uses through-hole mounting for insertion into PCB holes, while the 14-SOIC package uses surface-mount technology with gull-wing leads. Through-hole and surface-mount packages require different PCB designs and assembly processes. Direct substitution between these package types is not possible without PCB redesign.

Q: Why is LM339N/NOPB preferred over LM339NE3?

A: LM339N/NOPB supports the full supply voltage range specified for the KA339 (2V ~ 36V, ±1V ~ ±18V), while LM339NE3 is limited to 2V ~ 30V (±1V ~ ±15V). For applications requiring operation at 30V to 36V, LM339N/NOPB is the only suitable substitute among active products.

Q: Are there any compliance differences between substitute parts?

A: All recommended active substitutes (LM339N/NOPB, LM339NE3, LM339DR2G) are ROHS3 compliant. LM339AN is RoHS non-compliant and should not be used in applications requiring RoHS certification. All parts are EAR99 classified and REACH unaffected.

Q: Can I use LM339DR2G if my PCB is designed for through-hole mounting?

A: No. LM339DR2G uses 14-SOIC surface-mount packaging and cannot be installed in through-hole PCB designs. PCB redesign is required to accommodate surface-mount components.

Q: What is the impact of the extended temperature range in LM339N/NOPB?

A: LM339N/NOPB operates from -25°C to 85°C, compared to the KA339 range of 0°C to 70°C. This extended range provides additional operational margin and is beneficial for applications in extreme temperature environments. However, it does not affect compatibility with designs specified for 0°C to 70°C operation.