LP339DG4 Equivalent & Substitute Parts

Part Overview

The LP339DG4 is a general-purpose quad comparator IC manufactured by Texas Instruments in 14-SOIC surface-mount packaging. This device integrates four independent voltage comparators with CMOS, MOS, and open-collector output configurations, designed for signal conditioning and threshold detection applications across industrial and consumer electronics.

The LP339DG4 carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This necessitates identification of functionally equivalent alternatives to ensure design continuity and supply chain reliability for new production runs and long-term component availability.

Key Parameters

Parameter	LP339DG4 Specification
Manufacturer	Texas Instruments
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Number of Elements	4
Type	General Purpose
Output Type	CMOS, MOS, Open-Collector
Voltage - Supply, Single/Dual (±)	3V ~ 30V, ±1.5V ~ 15V
Voltage - Input Offset (Max)	5mV @ 30V
Current - Input Bias (Max)	0.025µA @ 5V
Current - Output (Typ)	30mA @ 5V
Current - Quiescent (Max)	100µA
Operating Temperature	0°C ~ 70°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LP339DG4 is determined by the following critical parameters:

Primary Compatibility Criteria:

Package type: 14-SOIC surface-mount form factor
Number of comparator elements: 4 independent channels
Output configuration: CMOS, MOS, or open-collector compatible
Supply voltage range: Must encompass or exceed 3V ~ 30V single supply or ±1.5V ~ 15V dual supply
Input offset voltage: Maximum 5mV specification
Input bias current: Maximum 0.025µA specification
Output current capability: Minimum 30mA at 5V
Quiescent current: Maximum 100µA
Operating temperature: Minimum 0°C ~ 70°C range
Compliance: ROHS3 and REACH requirements

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Direct Equivalents (Texas Instruments LP339 Series): Parts LP339M/NOPB, LP339MX/NOPB, LP339D, and LP339DR maintain the LP339 base product number and share identical functional architecture. These parts demonstrate full parameter compatibility within the specified operating envelope.

Category B - Cross-Manufacturer Alternatives: Parts from STMicroelectronics (LM139 and LM2901 series) and Rohm Semiconductor (BA2901 series) provide functional equivalence through comparable electrical specifications and identical package geometry, though with variations in specific parameter ratings and operating temperature ranges.

Parameter Comparison

Parameter	LP339DG4	LP339M/NOPB	LP339MX/NOPB	LP339D	LP339DR	LM139ADT	LM139DT	LM339ADT	LM339DT	BA2901SF-E2	LM2901HYDT
Manufacturer	TI	TI	TI	TI	TI	STM	STM	STM	STM	Rohm	STM
Number of Elements	4	4	4	4	4	4	4	4	4	4	4
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOP	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Voltage - Supply (±)	3V~30V, ±1.5V~15V	2V~36V, ±1V~18V	2V~36V, ±1V~18V	3V~30V, ±1.5V~15V	3V~30V, ±1.5V~15V	2V~32V, ±1V~16V	2V~32V, ±1V~16V	2V~32V, ±1V~16V	2V~32V, ±1V~16V	2V~36V, ±1V~18V	2V~36V, ±1V~18V
Voltage - Input Offset (Max)	5mV @ 30V	5mV @ 5V	5mV @ 5V	5mV @ 30V	5mV @ 30V	2mV @ 30V	5mV @ 30V	2mV @ 30V	5mV @ 30V	7mV @ 5V	Not Specified
Current - Input Bias (Max)	0.025µA @ 5V	0.025µA @ 5V	0.025µA @ 5V	0.025µA @ 5V	0.025µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	Not Specified
Current - Output (Typ)	30mA @ 5V	10mA @ 5V	10mA @ 5V	30mA @ 5V	30mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	16mA @ 5V	Not Specified
Current - Quiescent (Max)	100µA	100µA	100µA	100µA	100µA	2mA	2mA	2.5mA	2.5mA	2mA	2.5mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-55°C ~ 125°C	-55°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 105°C	Not Specified
Product Status	Last Time Buy	Active	Active	Last Time Buy	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

Tier 1 - Preferred Direct Replacements (Texas Instruments LP339 Series):

LP339M/NOPB and LP339MX/NOPB are the primary recommended substitutes. Both parts maintain Active product status, ensuring long-term availability and supply chain stability. These devices share identical electrical specifications with the LP339DG4 within the specified operating envelope. The LP339MX/NOPB offers superior inventory availability (3454 units) and is supplied in Cut Tape & Digi-Reel packaging, facilitating automated assembly processes. The LP339M/NOPB is supplied in Tube packaging with 1935 units in stock.

LP339DR is an alternative Texas Instruments option with Active status and the highest inventory level (5016 units) among TI variants. This part is supplied in Cut Tape & Digi-Reel format and maintains identical electrical performance to the LP339DG4.

Tier 2 - Cross-Manufacturer Alternatives (STMicroelectronics LM339 Series):

LM339DT and LM339ADT from STMicroelectronics provide functional equivalence with Active product status. LM339DT demonstrates exceptional inventory availability (445200 units) and maintains the 0°C ~ 70°C operating temperature range matching the LP339DG4. Input offset voltage specification is 5mV @ 30V, identical to the main part. Quiescent current is 2.5mA, which exceeds the LP339DG4 specification of 100µA but remains within acceptable limits for most applications.

Tier 3 - Extended Temperature Range Alternatives:

LM139ADT and LM139DT from STMicroelectronics extend the operating temperature range to -55°C ~ 125°C, suitable for industrial and automotive applications requiring enhanced thermal performance. These parts maintain ROHS3 compliance and are available in high quantities (4825 and 18338 units respectively).

Tier 4 - Alternative Manufacturers:

BA2901SF-E2 from Rohm Semiconductor provides functional equivalence with Active status and extended operating temperature range (-40°C ~ 105°C). This part is supplied in Tape & Reel format with 15500 units in stock. Package geometry is 14-SOP (0.173", 4.40mm width), which differs slightly from the standard 14-SOIC (0.154", 3.90mm width) and requires PCB layout verification before implementation.

LM2901HYDT from STMicroelectronics carries Automotive qualification (AEC-Q100) and is suitable for automotive-grade applications. This part features MSL rating of 3 (168 Hours), requiring controlled moisture exposure during storage and handling. Inventory availability is 4310 units.

Frequently Asked Questions (FAQ)

Q: Can LP339M/NOPB directly replace LP339DG4 without circuit modifications?

A: Yes. Both parts share identical electrical specifications within the 0°C ~ 70°C operating temperature range and 3V ~ 30V supply voltage envelope. The 14-SOIC package geometry is identical. No circuit modifications are required for direct substitution.

Q: What is the primary difference between LP339MX/NOPB and LP339M/NOPB?

A: The primary difference is packaging format. LP339MX/NOPB is supplied in Cut Tape & Digi-Reel format suitable for automated pick-and-place assembly, while LP339M/NOPB is supplied in Tube packaging. Electrical specifications are identical.

Q: Why do LM339DT and LM339ADT show lower quiescent current (2.5mA) compared to LP339DG4 (100µA)?

A: The quiescent current specification reflects the total device current consumption at idle state. The LM339 series from STMicroelectronics exhibits different internal circuit topology, resulting in higher quiescent current. This does not affect functional compatibility but may impact power consumption in battery-powered applications.

Q: Is BA2901SF-E2 compatible with existing PCB layouts designed for LP339DG4?

A: BA2901SF-E2 uses 14-SOP packaging (0.173", 4.40mm width) versus the standard 14-SOIC (0.154", 3.90mm width) of the LP339DG4. PCB footprint verification is required before implementation. Electrical specifications are compatible.

Q: Which substitute part offers the best long-term availability?

A: LM339DT from STMicroelectronics demonstrates the highest inventory level (445200 units) and Active product status, ensuring sustained availability for extended production runs. This part maintains electrical compatibility with the LP339DG4 within the specified operating envelope.

Q: Can LM2901HYDT be used in non-automotive applications?

A: Yes. LM2901HYDT is qualified to AEC-Q100 automotive standards but is functionally suitable for general-purpose applications. The higher MSL rating (3) requires controlled moisture handling during storage and assembly. Electrical specifications support general-purpose comparator applications.

Q: What is the impact of input offset voltage differences between substitute parts?

A: Input offset voltage variations (2mV to 7mV across the substitute range) affect threshold detection accuracy in precision applications. For general-purpose threshold detection, these variations are typically negligible. Applications requiring offset voltage below 2mV should specify LM139ADT or LM339ADT.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions for commercial and industrial applications.

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