BA2901F-E2 Equivalent & Substitute Parts

Part Overview

The BA2901F-E2 is a 4-channel general purpose comparator manufactured by Rohm Semiconductor in 14-SOP surface mount packaging. This linear IC operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), with open-collector output configuration suitable for logic-level interfacing. The device is actively produced and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence to support design flexibility and supply chain continuity.

Key Parameters

Parameter	BA2901F-E2 Specification
Manufacturer	Rohm Semiconductor
Number of Elements	4
Output Type	Open-Collector
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16mA @ 5V
Current - Quiescent (Max)	2mA
Operating Temperature	-40°C ~ 125°C
Package / Case	14-SOIC (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the BA2901F-E2 are qualified based on the following critical parameters:

4-channel comparator configuration
Open-collector output type
Supply voltage range compatibility: minimum 2V single supply and ±1V dual supply capability
Input offset voltage within acceptable tolerance
Input bias current specification
Output current capability
Quiescent current specification
Operating temperature range overlap
14-pin SOIC package form factor
Surface mount technology
RoHS3 compliance

Substitutes are grouped by manufacturer and packaging variant. Parts with identical electrical specifications but different packaging formats (Tape & Reel vs. Cut Tape) are considered direct equivalents. Parts with narrower operating temperature ranges or different MSL ratings are noted for application-specific evaluation.

Parameter Comparison

Part Number	Manufacturer	Output Type	Supply Voltage (Single/Dual)	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Package	Packaging Type	Product Status
BA2901F-E2	Rohm Semiconductor	Open-Collector	2V~36V, ±1V~18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 125°C	14-SOIC (0.173")	Tape & Reel	Active
AS339AMTR-E1	Diodes Incorporated	Open-Collector	2V~36V, ±1V~18V	3mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC (0.154")	Tape & Reel	Active
AS339MTR-E1	Diodes Incorporated	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 85°C	14-SOIC (0.154")	Cut Tape & Digi-Reel	Active
AS339MTR-G1	Diodes Incorporated	Open-Collector	2V~36V, ±1V~18V	5mV @ 5V	0.25µA @ 5V	16mA	2mA	-40°C ~ 85°C	14-SOIC (0.154")	Tape & Reel	Active
LM139AD	Texas Instruments	Open-Collector, Open-Drain	2V~30V, ±1V~15V	2mV @ 30V	0.1µA @ 5V	20mA	2mA	-55°C ~ 125°C	14-SOIC (0.154")	Tube	Last Time Buy
LM139ADT	STMicroelectronics	Open-Collector	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC (0.154")	Tape & Reel	Active
LM139DT	STMicroelectronics	Open-Collector	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-55°C ~ 125°C	14-SOIC (0.154")	Cut Tape & Digi-Reel	Active
LM239ADT	STMicroelectronics	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~16V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC (0.154")	Cut Tape & Digi-Reel	Active
LM239DT	STMicroelectronics	CMOS, DTL, ECL, MOS, Open-Collector, TTL	2V~32V, ±1V~16V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2mA	-40°C ~ 105°C	14-SOIC (0.154")	Cut Tape & Digi-Reel	Active
LM2901AVQDR	Texas Instruments	Open-Collector	2V~32V, ±1V~16V	2mV @ 32V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	14-SOIC (0.154")	Tape & Reel	Active
LM2901AVQDRG4	Texas Instruments	Open-Collector	2V~32V, ±1V~16V	2mV @ 32V	0.25µA @ 5V	20mA	2.5mA	-40°C ~ 125°C	14-SOIC (0.154")	Cut Tape & Digi-Reel	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Selection of substitute parts should be based on the following criteria:

Active Product Status Priority: AS339AMTR-E1, AS339MTR-E1, AS339MTR-G1, LM139ADT, LM139DT, LM239ADT, LM239DT, and LM2901AVQDR are all actively produced and recommended for new designs. LM139AD carries Last Time Buy status and LM2901AVQDRG4 is discontinued at DiGi Electronics; these should be avoided for new production unless legacy support is required.

Supply Voltage Compatibility: All listed substitutes support the minimum 2V single supply requirement. The BA2901F-E2 supports up to 36V single supply; substitutes support 30V to 32V maximum. Applications requiring operation above 32V single supply are limited to the BA2901F-E2.

Temperature Range Considerations: The BA2901F-E2 and LM2901AVQDR both support -40°C to 125°C operating range. Diodes Incorporated AS339 variants are limited to -40°C to 85°C. STMicroelectronics LM139 and LM239 variants support -40°C to 105°C or -55°C to 125°C depending on part number. Application temperature requirements should drive part selection.

RoHS3 Compliance: All listed parts are RoHS3 compliant and suitable for regulated markets.

Moisture Sensitivity: BA2901F-E2 and most substitutes carry MSL 1 (Unlimited). AS339MTR-E1 and AS339MTR-G1 carry MSL 3 (168 Hours), requiring controlled storage and handling for extended shelf life applications.

Frequently Asked Questions (FAQ)

Q: Can AS339AMTR-E1 directly replace BA2901F-E2 in all applications?

A: AS339AMTR-E1 is functionally equivalent for applications operating within -40°C to 85°C and single supply voltages up to 36V. The primary difference is the narrower operating temperature range (85°C maximum vs. 125°C for BA2901F-E2) and package width (0.154" vs. 0.173"). PCB layout compatibility should be verified before substitution.

Q: What is the significance of the different package widths (0.173" vs. 0.154")?

A: Package width affects PCB footprint spacing and component density. The BA2901F-E2 uses a wider 14-SOIC package (0.173", 4.40mm) compared to most substitutes (0.154", 3.90mm). While both are 14-pin SOIC packages, the footprints are not identical. PCB redesign may be required if substituting between these package variants.

Q: Are LM139 and LM239 variants interchangeable with BA2901F-E2?

A: LM139 and LM239 variants share the same 4-channel comparator architecture and open-collector output. However, LM139 and LM239 support maximum single supply voltages of 30V to 32V, compared to 36V for BA2901F-E2. For applications requiring 33V to 36V operation, only BA2901F-E2 is suitable. For lower voltage applications, these parts are compatible.

Q: What does "Last Time Buy" status mean for LM139AD?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available, but production has ceased or will cease. New designs should not use LM139AD; active alternatives such as LM139ADT or AS339AMTR-E1 should be selected instead.

Q: How do input offset voltage specifications affect circuit performance?

A: Input offset voltage determines the accuracy of voltage comparison at the threshold point. BA2901F-E2 specifies 7mV maximum at 5V, while some substitutes (LM139AD, LM139ADT, LM239ADT, LM2901AVQDR) specify 2mV maximum. Lower offset voltage provides better accuracy for precision threshold detection. Applications with tight tolerance requirements should prioritize parts with lower offset specifications.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel packaging is supplied on continuous carrier tape suitable for automated pick-and-place assembly. Cut Tape & Digi-Reel packaging is supplied in shorter tape segments or alternative reel formats. Both are surface mount compatible. Selection depends on manufacturing equipment and volume requirements.

Q: Can I use LM2901AVQDRG4 for new production?

A: LM2901AVQDRG4 is discontinued at DiGi Electronics and should not be used for new production designs. LM2901AVQDR (active Tape & Reel variant) is the recommended alternative from Texas Instruments if LM2901 architecture is required.

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