LM339AD Equivalent & Substitute Parts

Part Overview

The LM339AD is a general-purpose quad comparator manufactured by Texas Instruments in 14-SOIC surface-mount packaging. This device features open-collector outputs and operates across a wide supply voltage range of 2V to 30V (single supply) or ±1V to ±15V (dual supply). The LM339AD is classified as Last Time Buy, indicating limited availability. Identifying equivalent and substitute parts is essential for design continuity, long-term sourcing reliability, and production planning when the primary part reaches end-of-life status.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM339AD
Manufacturer	Texas Instruments
Category	Linear
Type	General Purpose Comparator
Number of Elements	4
Output Type	Open-Collector
Package / Case	14-SOIC (0.154", 3.90mm Width)
Voltage - Supply, Single/Dual (±)	2V ~ 30V, ±1V ~ 15V
Voltage - Input Offset (Max)	3mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2.5mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM339AD is determined by the following critical parameters:

Primary Substitution Criteria:

Number of Elements: 4 comparators
Output Type: Open-Collector (or compatible output architecture)
Package Type: 14-SOIC surface-mount form factor
Supply Voltage Range: Minimum 2V to 30V single supply capability
Input Offset Voltage: Maximum 3mV or lower at 30V
Input Bias Current: Maximum 0.25µA or lower at 5V
Output Current: Minimum 16mA typical capability
Quiescent Current: Maximum 2.5mA or lower
Operating Temperature: Minimum 0°C to 70°C range
RoHS3 Compliance and MSL Level 1

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (Identical Electrical Performance): Parts that meet all primary substitution criteria with identical or superior electrical specifications and maintain the same 14-SOIC package footprint.

Category B - Extended-Range Alternatives (Enhanced Specifications): Parts that exceed the LM339AD specifications in supply voltage range, temperature range, or input offset voltage performance while maintaining package compatibility and core functionality.

Parameter Comparison

Part Number	Manufacturer	Output Type	Supply Voltage (Single)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent (Max)	Temp Range	Package	Product Status
LM339AD	Texas Instruments	Open-Collector	2V ~ 30V	3mV @ 30V	0.25µA @ 5V	20mA	2.5mA	0°C ~ 70°C	14-SOIC	Last Time Buy
LM339ADR	Texas Instruments	Open-Collector	2V ~ 30V	3mV @ 30V	0.25µA @ 5V	20mA	2.5mA	0°C ~ 70°C	14-SOIC	Active
LM339AMX/NOPB	Texas Instruments	Open-Collector	2V ~ 36V	2mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC	Active
LM339AM/NOPB	National Semiconductor	Open-Collector	2V ~ 36V	2mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C ~ 70°C	14-SOIC	Active
LP339MX/NOPB	Texas Instruments	CMOS/MOS/Open-Collector	2V ~ 36V	5mV @ 5V	0.025µA @ 5V	10mA @ 5V	100µA	0°C ~ 70°C	14-SOIC	Active
LP339M/NOPB	Texas Instruments	CMOS/MOS/Open-Collector	2V ~ 36V	5mV @ 5V	0.025µA @ 5V	10mA @ 5V	100µA	0°C ~ 70°C	14-SOIC	Active
LM139AD	Texas Instruments	Open-Collector/Open-Drain	2V ~ 30V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC	Last Time Buy
LM139DT	STMicroelectronics	Open-Collector	2V ~ 32V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
LM139ADT	STMicroelectronics	Open-Collector	2V ~ 32V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC	Active
BA10339F-E2	Rohm Semiconductor	Open-Collector	3V ~ 36V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOP	Active
BA2901SF-E2	Rohm Semiconductor	Open-Collector	2V ~ 36V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOP	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement: LM339ADR is the optimal substitute for LM339AD. Both parts are manufactured by Texas Instruments with identical electrical specifications, package footprint, and compliance certifications. The LM339ADR is in Active product status with significantly higher inventory availability (105,100 units), ensuring long-term sourcing continuity. The only difference is packaging format: LM339ADR is supplied in Cut Tape (CT) & Digi-Reel format versus the LM339AD tube packaging. This substitution requires no circuit redesign.

Secondary Recommendations - Enhanced Performance: LM339AMX/NOPB and LM339AM/NOPB provide extended supply voltage range (2V to 36V) with improved input offset voltage (2mV maximum) compared to the LM339AD (3mV maximum). Both maintain identical quiescent current and input bias specifications. These parts are in Active status with robust inventory levels. Selection is appropriate when designs require extended voltage headroom or improved precision.

Extended Temperature Range Alternative: LM139ADT (STMicroelectronics) and LM139AD (Texas Instruments) offer expanded operating temperature range (-55°C to 125°C) compared to the LM339AD (0°C to 70°C). These parts maintain open-collector output architecture and 14-SOIC packaging. LM139ADT is in Active status with 4,825 units in stock. Selection is necessary for industrial or automotive applications requiring extended temperature performance.

Low-Power Alternative: LP339MX/NOPB and LP339M/NOPB feature significantly reduced quiescent current (100µA maximum versus 2.5mA) and lower input bias current (0.025µA versus 0.25µA). These CMOS/MOS output variants are suitable for battery-powered or ultra-low-power applications. Both are in Active status with adequate inventory. Note: Output current is reduced to 10mA typical, which may limit drive capability in high-current applications.

International Sourcing Options: BA10339F-E2 (Rohm Semiconductor) and BA2901SF-E2 (Rohm Semiconductor) provide alternative sourcing from non-Texas Instruments manufacturers. Both use 14-SOP packaging (0.173" width versus 0.154" for SOIC) and maintain open-collector output architecture. BA10339F-E2 offers -40°C to 85°C temperature range with 166,201 units in stock. BA2901SF-E2 extends to -40°C to 105°C with 15,500 units available. PCB layout modifications are required due to package width difference.

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can LM339ADR be used as a direct drop-in replacement for LM339AD? A: Yes. LM339ADR is electrically and functionally identical to LM339AD with matching specifications across all critical parameters. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). No circuit modifications are required. Verify tape reel compatibility with your assembly equipment before production transition.

Q: What is the difference between LM339AD and LM139AD? A: LM139AD offers superior performance in three areas: lower input offset voltage (2mV versus 3mV), lower input bias current (0.1µA versus 0.25µA), and extended operating temperature range (-55°C to 125°C versus 0°C to 70°C). LM139AD also features open-drain output capability in addition to open-collector. Both use identical 14-SOIC packaging. LM139AD is suitable for precision applications and extended temperature environments.

Q: Are the Rohm Semiconductor parts (BA10339F-E2, BA2901SF-E2) pin-compatible with LM339AD? A: Pin configuration is identical; however, package dimensions differ. Rohm parts use 14-SOP packaging with 0.173" width versus 14-SOIC with 0.154" width for Texas Instruments parts. PCB footprint modifications are required. Verify mechanical clearance and reflow profile compatibility before design implementation.

Q: Why does LP339MX/NOPB have higher quiescent current specification (100µA) compared to LM339AD (2.5mA)? A: This is a documentation error in the provided data. LP339 series typically features lower quiescent current than LM339 due to CMOS output architecture. Consult the manufacturer datasheet for accurate specifications before final design selection.

Q: Can I substitute LM339AD with LP339MX/NOPB in a high-current output application? A: No. LP339MX/NOPB output current is rated at 10mA typical versus 20mA for LM339AD. If your application requires output currents exceeding 10mA, use LM339ADR, LM339AMX/NOPB, or LM139ADT instead.

Q: What is the significance of "Last Time Buy" status for LM339AD? A: Last Time Buy indicates the manufacturer will discontinue production after a specified date. Existing inventory will be depleted without replenishment. Immediate transition to an Active-status substitute part is recommended for new designs and long-term production planning. LM339ADR is the recommended transition path.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and environmental regulations.

Q: Which substitute offers the best performance for precision comparator applications? A: LM339AMX/NOPB and LM339AM/NOPB provide the lowest input offset voltage (2mV maximum) among direct substitutes. For extended temperature precision applications, LM139ADT offers 2mV input offset with -55°C to 125°C operating range.

Q: Can I use multiple substitute parts interchangeably within the same production run? A: Electrical interchangeability is confirmed for LM339ADR, LM339AMX/NOPB, and LM339AM/NOPB. However, sourcing from multiple manufacturers (Texas Instruments, National Semiconductor, STMicroelectronics, Rohm) may introduce minor parametric variations. Implement design validation testing and establish supplier qualification procedures before mixed-source production.

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