LM139 MDR Equivalent & Substitute Parts Reference

Part Overview

The LM139 MDR is a low-power, low-offset voltage general-purpose comparator manufactured by Texas Instruments in die form. This component features four independent comparator elements with open-collector/open-drain output configuration, designed for applications requiring precision voltage comparison across extended supply voltage ranges (5V ~ 30V single supply, ±2.5V ~ 15V dual supply). The part maintains active product status with 1033 units in current inventory.

Substitute parts are necessary when die-form packaging is unavailable, when alternative manufacturers are required for supply chain continuity, or when packaged alternatives better suit manufacturing processes such as surface-mount assembly or through-hole insertion.

Key Parameters

Parameter	Value	Specification Basis
Number of Elements	4	Quad comparator configuration
Output Type	Open-Collector, Open-Drain	Output stage topology
Voltage Supply Range (Single)	5V ~ 30V	Operating voltage envelope
Voltage Supply Range (Dual)	±2.5V ~ 15V	Bipolar supply capability
Input Offset Voltage (Max)	5mV @ 30V	Precision specification
Input Bias Current (Max)	1000pA @ 5V	Input impedance characteristic
Quiescent Current (Max)	3mA	Power consumption
Propagation Delay (Max)	700ns (Typ)	Response time
Hysteresis	10mV	Noise immunity
Operating Temperature	-55°C ~ 125°C	Temperature range
Mounting Type	Surface Mount (Die)	Package form factor
RoHS Status	ROHS3 Compliant	Environmental compliance

Substitute Part Grouping Explanation

Substitution eligibility for the LM139 MDR is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Four independent comparator elements
Open-collector or open-drain output configuration
Supply voltage range encompassing 5V ~ 30V (single) and ±2.5V ~ 15V (dual)
Input offset voltage specification of 5mV or better
Operating temperature range including -55°C to 125°C (or subset thereof)
ROHS3 compliance

Functional Equivalence Parameters:

Input bias current ≤ 1000pA
Quiescent current ≤ 3mA
Hysteresis characteristics ≥ 10mV
Propagation delay ≤ 700ns

Substitute parts are grouped by packaging technology (14-SOIC, 14-TSSOP, 16-QFN) and manufacturer (STMicroelectronics, onsemi, Analog Devices). Die-form alternatives are not available; all substitutes provide packaged solutions suitable for automated assembly.

Parameter Comparison

Part Number	Manufacturer	Package	Supply Range (Single)	Supply Range (Dual)	Input Offset (Max)	Input Bias (Max)	Quiescent Current (Max)	Temp Range	Output Type
LM139 MDR	Texas Instruments	Die	5V ~ 30V	±2.5V ~ 15V	5mV @ 30V	1000pA @ 5V	3mA	-55°C ~ 125°C	Open-Collector, Open-Drain
LM239PT	STMicroelectronics	14-TSSOP	2V ~ 32V	±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	2mA	-40°C ~ 105°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM239QT	STMicroelectronics	16-QFN (3x3)	2V ~ 36V	±1V ~ 18V	5mV	0.25µA @ 5V	2mA	-40°C ~ 105°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM2901D	STMicroelectronics	14-SOIC	2V ~ 32V	±1V ~ 16V	7mV @ 5V	0.25µA @ 5V	2.5mA	-40°C ~ 125°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM2901DT	STMicroelectronics	14-SOIC	2V ~ 32V	±1V ~ 16V	7mV @ 5V	0.25µA @ 5V	2.5mA	-40°C ~ 125°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM2901HYDT	STMicroelectronics	14-SOIC	2V ~ 36V	±1V ~ 18V	Not specified	Not specified	2.5mA	Not specified	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM2901Q4T	STMicroelectronics	16-QFN (3x3)	2V ~ 36V	±1V ~ 18V	Not specified	Not specified	2.5mA	Not specified	CMOS, DTL, MOS, Open-Collector, TTL
LM2901VDTBR2G	onsemi	14-TSSOP	3V ~ 36V	±1.5V ~ 18V	7mV @ 5V	0.25µA @ 5V	2.5mA	-40°C ~ 125°C	CMOS, Open-Collector, TTL
LM339ADT	STMicroelectronics	14-SOIC	2V ~ 32V	±1V ~ 16V	2mV @ 30V	0.1µA @ 5V	2.5mA	0°C ~ 70°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
LM339D	STMicroelectronics	14-SOIC	2V ~ 32V	±1V ~ 16V	5mV @ 30V	0.25µA @ 5V	2.5mA	0°C ~ 70°C	CMOS, DTL, ECL, MOS, Open-Collector, TTL
MAX516ACNG+	Analog Devices Inc./Maxim Integrated	24-DIP	4.75V ~ 16.5V	Not specified	Not specified	0.3µA @ 16.5V	10mA	0°C ~ 70°C	CMOS, TTL

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM2901DT and LM2901D (STMicroelectronics, 14-SOIC packaging) provide the closest functional equivalence to LM139 MDR. Both maintain the full -40°C ~ 125°C operating temperature range, support dual supply operation (±1V ~ 16V), and deliver quiescent current specifications within 2.5mA. These parts are available in high inventory (185200 and 36100 units respectively) and carry ROHS3 compliance with MSL 1 rating.

LM239PT (STMicroelectronics, 14-TSSOP) offers equivalent electrical performance with extended supply voltage range (2V ~ 32V single, ±1V ~ 16V dual) and reduced quiescent current (2mA). The 14-TSSOP package provides superior space efficiency for surface-mount applications. Inventory availability is substantial (65200 units).

Secondary Substitutes (Extended Supply Range):

LM239QT and LM2901Q4T (both STMicroelectronics, 16-QFN 3x3 packaging) extend the supply voltage envelope to 2V ~ 36V (single) and ±1V ~ 18V (dual), accommodating applications requiring higher supply voltages. The 16-QFN package reduces board footprint compared to 14-SOIC alternatives.

LM2901VDTBR2G (onsemi, 14-TSSOP) provides automotive-grade qualification (AEC-Q100) with extended supply range (3V ~ 36V single, ±1.5V ~ 18V dual) and full temperature range (-40°C ~ 125°C). MSL 3 rating requires controlled moisture exposure during storage and assembly.

Limited Substitutes (Restricted Temperature Range):

LM339ADT and LM339D (STMicroelectronics, 14-SOIC) operate within 0°C ~ 70°C temperature range, restricting use to commercial-grade applications. LM339ADT exhibits superior input offset voltage (2mV @ 30V) and lower input bias current (0.1µA @ 5V), suitable for precision measurement circuits within the specified temperature window.

Obsolete Alternative (Not Recommended):

MAX516ACNG+ (Analog Devices Inc./Maxim Integrated, 24-DIP) carries obsolete product status. Supply voltage range (4.75V ~ 16.5V) does not encompass the full LM139 MDR specification. Quiescent current (10mA) exceeds acceptable limits. Through-hole packaging incompatible with modern surface-mount assembly. Use only when legacy through-hole designs require component replacement.

Frequently Asked Questions (FAQ)

Q: Can LM239PT directly replace LM139 MDR in all applications?

A: LM239PT provides functional equivalence for applications operating within -40°C ~ 105°C temperature range. The LM139 MDR extends to -55°C minimum and 125°C maximum. Verify application temperature requirements before substitution. LM239PT offers superior supply voltage range (2V ~ 32V vs. 5V ~ 30V) and lower quiescent current (2mA vs. 3mA).

Q: What is the difference between LM2901DT and LM2901D?

A: Both parts are electrically identical (14-SOIC package, STMicroelectronics manufacture). LM2901DT is supplied in cut tape and digi-reel packaging (185200 units available), while LM2901D is supplied in tube packaging (36100 units available). Selection depends on assembly equipment compatibility and inventory requirements.

Q: Why does LM2901HYDT lack complete electrical specifications?

A: LM2901HYDT carries automotive-grade qualification (AEC-Q100) with MSL 3 rating. Incomplete datasheet entries indicate parameters are qualified under automotive standards rather than standard commercial specifications. Contact manufacturer for detailed automotive-grade electrical characteristics.

Q: Is the 16-QFN package compatible with 14-SOIC footprints?

A: No. 16-QFN (3x3) and 14-SOIC packages are physically and electrically incompatible. PCB layout redesign is required. LM239QT and LM2901Q4T (16-QFN) require new footprint design but offer reduced board area and extended supply voltage range (2V ~ 36V).

Q: Can MAX516ACNG+ substitute for LM139 MDR?

A: MAX516ACNG+ is not recommended. Product status is obsolete. Supply voltage range (4.75V ~ 16.5V) does not cover LM139 MDR minimum (5V) or maximum (30V) specifications. Quiescent current (10mA) exceeds LM139 MDR specification (3mA). Through-hole 24-DIP package incompatible with modern assembly processes.

Q: What is the significance of ROHS3 compliance and MSL ratings?

A: ROHS3 compliance confirms lead-free construction and restricted hazardous substance compliance. MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life under standard conditions. MSL 3 (LM2901HYDT) requires controlled storage (≤30% relative humidity) and bake-out procedures before reflow soldering. All listed substitutes carry ROHS3 compliance.

Q: Which substitute offers the lowest power consumption?

A: LM239PT and LM239QT both specify 2mA maximum quiescent current, representing 33% reduction compared to LM139 MDR (3mA). For battery-powered or energy-constrained applications, these parts provide superior efficiency.

Q: Are there temperature-restricted substitutes suitable for industrial applications?

A: LM339ADT and LM339D operate within 0°C ~ 70°C range, suitable for industrial environments within this window. LM339ADT offers superior precision (2mV input offset voltage) for measurement circuits. Verify specific application temperature requirements before selection.

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