LP339N Equivalent & Substitute Parts

Part Overview

The LP339N is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent comparators in a 14-pin DIP package. This device operates across a wide supply voltage range (3V to 30V single supply, ±1.5V to ±15V dual supply) and is designed for applications requiring precision voltage comparison with CMOS/MOS output architecture and open-collector output capability.

The LP339N is classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for new production runs and field replacements.

Substiute Parts

LP339N

Texas InstrumentsIn Stock: 25152LP339N Datasheet

Current PartRFQ

LP339N/NOPB

Texas InstrumentsIn Stock: 956LP339N/NOPB Datasheet

DirectRFQ

LP339DR

Texas InstrumentsIn Stock: 5077LP339DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP339N is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

• Number of comparator elements: 4
• Output type: CMOS, MOS, Open-Collector
• Supply voltage range: Must encompass or match the original specification
• Input offset voltage: Maximum 5mV
• Input bias current: Maximum 0.025µA @ 5V
• Output current capability: Minimum 30mA @ 5V
• Quiescent current: Maximum 100µA
• Operating temperature range: 0°C ~ 70°C

Mechanical & Packaging Compatibility:

• Package type and pin count must be identical or functionally equivalent
• Mounting type determines board-level integration approach

Substitute parts are grouped into two categories:

1. Direct Functional Equivalent (DIP Package): LP339N/NOPB maintains identical pinout and through-hole mounting, with enhanced supply voltage range (2V ~ 36V single, ±1V ~ 18V dual) and active product status.

2. Manufacturer-Recommended Alternative (SOIC Package): LP339DR provides identical electrical specifications with surface-mount packaging, requiring PCB redesign but offering improved thermal performance and manufacturing efficiency.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No PCB Redesign): Select LP339N/NOPB when maintaining existing through-hole PCB designs. This part provides identical pinout compatibility with the LP339N while offering active product status and extended supply voltage range (2V ~ 36V single supply). The LP339N/NOPB is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating, suitable for standard manufacturing and storage conditions.

For New Designs or PCB Redesign Scenarios: Select LP339DR when implementing surface-mount technology or designing new PCB layouts. This part maintains all critical electrical parameters while offering the manufacturing advantages of SOIC packaging. The LP339DR is ROHS3 compliant with MSL 1 (Unlimited) rating and active product status, ensuring long-term availability.

Compliance Considerations: All three parts (LP339N, LP339N/NOPB, LP339DR) are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can LP339N/NOPB be used as a direct replacement for LP339N without circuit modification?

A: Yes. LP339N/NOPB maintains identical pinout, package dimensions (14-DIP, 0.300"), and electrical specifications. No circuit modification is required. The primary difference is product status (Active vs. Last Time Buy) and slightly extended supply voltage range on the LP339N/NOPB.

Q: What is the key difference between LP339N/NOPB and LP339DR?

A: The primary difference is packaging and mounting type. LP339N/NOPB uses 14-DIP through-hole packaging, while LP339DR uses 14-SOIC surface-mount packaging. Both maintain identical electrical specifications and pin count. LP339DR requires PCB redesign for implementation.

Q: Are there any electrical performance differences between these three parts?

A: All three parts meet the same electrical specifications for comparator operation: 4 elements, CMOS/MOS/open-collector output, 30mA output current, 100µA maximum quiescent current, and 0°C to 70°C operating temperature. LP339N/NOPB offers extended supply voltage range (2V ~ 36V single, ±1V ~ 18V dual) compared to the original LP339N specification (3V ~ 30V single, ±1.5V ~ 15V dual).

Q: Which substitute part should be selected for new production designs?

A: LP339N/NOPB is recommended for new through-hole designs, and LP339DR is recommended for new surface-mount designs. Both parts carry active product status, ensuring long-term availability and manufacturing support.

Q: Are all substitute parts RoHS compliant?

A: Yes. LP339N, LP339N/NOPB, and LP339DR are all ROHS3 compliant and REACH unaffected, meeting environmental regulations for industrial applications.

Q: What is the moisture sensitivity level (MSL) for each part?

A: LP339N has MSL not applicable. LP339N/NOPB and LP339DR both carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.