LM339PWR Equivalent & Substitute Parts

Part Overview

The LM339PWR is a general-purpose comparator IC manufactured by Rohm Semiconductor, featuring four independent comparators in a 14-TSSOP surface-mount package. This device operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and is designed for open-collector output applications. The LM339PWR is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current availability and product status requirements.

Key Parameters

Parameter	LM339PWR	Unit
Number of Elements	4	Comparators
Output Type	Open-Collector	—
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	V
Voltage - Input Offset (Max)	7mV @ 5V	mV
Current - Input Bias (Max)	0.25µA @ 5V	µA
Current - Quiescent (Max)	2mA	mA
Operating Temperature	0°C ~ 70°C	°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the LM339PWR is determined by the following critical parameters:

Electrical Compatibility:

Four independent comparator elements
Open-collector output configuration
Supply voltage range: minimum 2V to 36V single supply capability
Input offset voltage within acceptable tolerance
Input bias current specifications
Quiescent current specifications

Mechanical Compatibility:

14-pin package format (TSSOP, SOIC, or CDIP variants acceptable)
Surface-mount or through-hole mounting capability
Pin-compatible footprint

Regulatory Compliance:

ROHS3 compliance required
REACH unaffected status

Substitute parts are grouped into two categories: Upgrade parts offering improved specifications with active product status, and Similar parts providing functional equivalence with alternative package formats or manufacturers.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Quiescent Current (Max)	Operating Temp	Output Type
LM339PWR	Rohm Semiconductor	Obsolete	14-TSSOP	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	0.25µA @ 5V	2mA	0°C ~ 70°C	Open-Collector
LM2901AT14-13	Diodes Incorporated	Active	14-TSSOP	2V ~ 36V, ±1V ~ 18V	2mV @ 5V	0.25µA @ 5V	2.5mA	-40°C ~ 125°C	—
CMP04FSZ-REEL	Analog Devices Inc.	Active	14-SOIC	3.3V ~ 36V, ±1.65V ~ 18V	1mV @ 5V	0.1µA @ 5V	3mA	-40°C ~ 85°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM139ADT	STMicroelectronics	Active	14-SOIC	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	2mA	-55°C ~ 125°C	—
LM139J/PB	Texas Instruments	Active	14-CDIP	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	0.1µA @ 5V	2.5mA	-55°C ~ 125°C	Open-Collector, Open-Drain
LM239ADT	STMicroelectronics	Active	14-SOIC	2V ~ 32V, ±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	2mA	-40°C ~ 105°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM239D	STMicroelectronics	Active	14-SOIC	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	2mA	-40°C ~ 105°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM239DR	Texas Instruments	Active	14-SOIC	2V ~ 30V, ±1V ~ 15V	5mV @ 30V	0.25µA @ 5V	2mA	-25°C ~ 85°C	Open-Collector
LM239DRG3	Texas Instruments	Last Time Buy	14-SOIC	2V ~ 30V, ±1V ~ 15V	5mV @ 30V	0.25µA @ 5V	2mA	-25°C ~ 85°C	Open-Collector
LM239DT	STMicroelectronics	Active	14-SOIC	2V ~ 32V, ±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	2mA	-40°C ~ 105°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM239DTBR2G	onsemi	Active	14-TSSOP	3V ~ 36V, ±1.5V ~ 18V	5mV @ 5V	0.25µA @ 5V	2.5mA	-25°C ~ 85°C	CMOS, Open-Collector, TTL

Engineering Selection Recommendations

Primary Upgrade Option: LM2901AT14-13 (Diodes Incorporated) is the recommended upgrade substitute. It maintains identical package format (14-TSSOP), matching supply voltage range, and equivalent input bias current. The part offers improved input offset voltage (2mV vs. 7mV) and extended operating temperature range (-40°C to 125°C vs. 0°C to 70°C). Active product status ensures long-term availability and supply chain stability.

Package Format Alternatives: For applications where package format flexibility is acceptable, 14-SOIC variants provide equivalent electrical performance. LM239ADT and LM239DT (STMicroelectronics) offer active product status with extended temperature ranges. LM239DR (Texas Instruments) provides high inventory availability (157,700 pcs) with open-collector output compatibility.

Through-Hole Applications: LM139J/PB (Texas Instruments) in 14-CDIP format serves applications requiring through-hole mounting. This part maintains open-collector output configuration and full supply voltage range compatibility with extended operating temperature range (-55°C to 125°C).

Compliance Verification: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original LM339PWR regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2901AT14-13 directly replace LM339PWR in existing designs? A: Yes. LM2901AT14-13 maintains identical 14-TSSOP package format, pin compatibility, and electrical specifications within acceptable tolerances. The improved input offset voltage (2mV vs. 7mV) and extended temperature range provide enhanced performance margins.

Q: What is the difference between TSSOP and SOIC package formats? A: Both are surface-mount packages with identical pin counts and electrical compatibility. TSSOP (Thin Shrink Small Outline Package) has a narrower body width (4.40mm) compared to SOIC (Small Outline Integrated Circuit, 3.90mm). PCB footprints differ; verify layout compatibility before substitution.

Q: Are 14-SOIC variants electrically equivalent to the 14-TSSOP LM339PWR? A: Yes, electrically equivalent. LM239ADT, LM239D, LM239DT, and LM239DR all provide four independent comparators with open-collector output and compatible supply voltage ranges. Package format change requires PCB redesign.

Q: Why is LM239DRG3 marked as "Last Time Buy"? A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part. While currently available (85,300 pcs inventory), future availability is not guaranteed. Active alternatives such as LM239DR or LM239ADT are recommended for new designs.

Q: What is the significance of input offset voltage differences (7mV vs. 2mV)? A: Input offset voltage determines the accuracy of voltage comparison at the threshold point. Lower values (2mV) provide tighter tolerance and reduced error margin. Selection depends on application precision requirements; both values are acceptable for general-purpose comparator applications.

Q: Can I use CMP04FSZ-REEL as a substitute despite the 3.3V minimum supply voltage? A: CMP04FSZ-REEL has a 3.3V minimum supply voltage versus LM339PWR's 2V minimum. Substitution is valid only for applications operating at 3.3V or higher. For designs requiring 2V operation, use LM2901AT14-13, LM139ADT, or LM239 variants.

Q: What mounting type should I select for new production? A: Surface-mount packages (TSSOP, SOIC) are standard for modern PCB assembly. LM2901AT14-13 in 14-TSSOP format is recommended for new designs. Through-hole packages (14-CDIP) are suitable only for legacy or specialized applications.

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