LM239AMDREP Equivalent & Substitute Parts

Part Overview

The LM239AMDREP is a general-purpose comparator IC manufactured by Texas Instruments, featuring four differential comparators in a 14-SOIC 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 part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Finding equivalent and substitute parts may be necessary due to inventory constraints, lead time requirements, or specific application needs while maintaining functional compatibility.

Key Parameters

Parameter	Value
Number of Elements	4
Output Type	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	2.5mV @ 1.4V
Current - Input Bias (Max)	0.25µA @ 1.4V
Current - Output (Typ)	20mA
Current - Quiescent (Max)	2mA
Operating Temperature	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM239AMDREP is determined by the following critical parameters:

Four differential comparator elements
Supply voltage compatibility (2V to 36V single supply, ±1V to ±18V dual supply)
Input offset voltage and input bias current specifications
Output current capability
Operating temperature range (-55°C to 125°C minimum)
Surface-mount package format with compatible pinout
RoHS3 compliance and MSL rating

The LM2901QT14-13 from Diodes Incorporated meets these core functional requirements while maintaining electrical compatibility across the specified operating conditions. Both devices share the same base product architecture (LM239 and LM2901 series) with equivalent supply voltage ranges and input/output characteristics suitable for general-purpose comparator applications.

Parameter Comparison

Parameter	LM239AMDREP (TI)	LM2901QT14-13 (Diodes)	Compatibility
Number of Elements	4	4	Match
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	Match
Voltage - Input Offset (Max)	2.5mV @ 1.4V	7mV @ 5V	Substitute within tolerance
Current - Input Bias (Max)	0.25µA @ 1.4V	0.25µA @ 5V	Match
Current - Output (Typ)	20mA	16mA @ 5V	Substitute within tolerance
Current - Quiescent (Max)	2mA	2.5mA	Substitute within tolerance
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	Substitute with reduced low-temperature range
Package / Case	14-SOIC	14-TSSOP	Different package, same pinout compatibility
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Match

Engineering Selection Recommendations

The LM2901QT14-13 is a qualified substitute for the LM239AMDREP based on the following criteria:

Both devices maintain RoHS3 compliance and unlimited moisture sensitivity rating, ensuring equivalent environmental qualification
Supply voltage ranges are identical, supporting the same circuit topologies and power supply configurations
Input bias current specifications are equivalent, maintaining signal integrity in high-impedance applications
Output current capability of the substitute (16mA) remains suitable for standard logic-level loads
The substitute carries AEC-Q100 automotive qualification, providing additional reliability assurance for demanding applications
Operating temperature range of the substitute (-40°C to 125°C) covers most industrial and commercial applications; applications requiring -55°C operation require the original LM239AMDREP

Package differences (14-SOIC versus 14-TSSOP) require PCB layout verification to confirm mechanical fit and thermal performance compatibility.

Frequently Asked Questions (FAQ)

Q: Can the LM2901QT14-13 directly replace the LM239AMDREP in existing designs?

A: Electrical substitution is valid for applications operating above -40°C. The 14-TSSOP package has different physical dimensions than the 14-SOIC package, requiring PCB footprint verification before implementation.

Q: What is the significance of the output type difference (Open-Collector versus CMOS/TTL)?

A: The LM239AMDREP features open-collector output, while the LM2901QT14-13 offers CMOS/TTL output. These represent different output stage architectures. Verify that the receiving circuit is compatible with the substitute's output characteristics.

Q: Are there temperature range limitations when using the substitute?

A: The LM2901QT14-13 operates from -40°C to 125°C, compared to the LM239AMDREP range of -55°C to 125°C. Applications requiring operation below -40°C must use the original part.

Q: How do the input offset voltage specifications compare?

A: The LM239AMDREP specifies 2.5mV maximum input offset at 1.4V, while the LM2901QT14-13 specifies 7mV maximum at 5V. Both values are within acceptable ranges for general-purpose comparator applications; precision applications may require evaluation.

Q: What packaging considerations apply to this substitution?

A: The LM239AMDREP uses 14-SOIC (0.154" width), while the LM2901QT14-13 uses 14-TSSOP (0.173" width). Verify PCB footprint compatibility and thermal management requirements before design implementation.

Q: Are both parts equally available in the market?

A: Inventory levels differ between manufacturers. The LM2901QT14-13 shows higher stock availability (7600 pcs) compared to the LM239AMDREP (3829 pcs), which may influence sourcing decisions.

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