LM2901PT Equivalent & Substitute Parts

Part Overview

The LM2901PT is a general-purpose comparator IC manufactured by Rohm Semiconductor, featuring four independent comparators in a 14-TSSOP surface-mount package. This device supports multiple output types including CMOS, MOS, Open-Collector, and TTL configurations, with a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The LM2901PT is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence across core electrical parameters while accommodating packaging and availability constraints.

Key Parameters

Parameter	LM2901PT Value
Number of Elements	4
Output Type	CMOS, MOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	7mV @ 5V
Current - Input Bias (Max)	0.25µA @ 5V
Current - Output (Typ)	16nA @ 5V
Current - Quiescent (Max)	2mA
Operating Temperature	-40°C ~ 125°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM2901PT is determined by the following critical parameters:

Functional Requirements:

Four independent comparator elements
Output type compatibility (Open-Collector primary requirement; CMOS/TTL secondary)
Supply voltage range overlap with 2V ~ 36V / ±1V ~ 18V

Electrical Performance:

Input offset voltage ≤ 7mV @ 5V
Input bias current ≤ 0.25µA @ 5V
Quiescent current ≤ 2mA

Physical & Environmental:

Surface-mount package (14-TSSOP preferred for pin-compatible substitution; 14-SOIC acceptable with PCB layout modification)
Operating temperature range -40°C ~ 125°C (minimum requirement)
RoHS3 compliance and MSL rating ≤ 3

Substitute parts are grouped into two categories: pin-compatible replacements (14-TSSOP package) and functional equivalents (alternative packages requiring layout adjustment).

Parameter Comparison

Parameter	LM2901PT	AS339GTR-E1	LMV339IPW	TLV1704AIPWR	LM239APT
Manufacturer	Rohm Semiconductor	Diodes Incorporated	Texas Instruments	Texas Instruments	STMicroelectronics
Number of Elements	4	4	4	4	4
Output Type	CMOS, MOS, Open-Collector, TTL	Open-Collector	Open-Collector	Open-Collector	CMOS, DTL, ECL, MOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2.7V ~ 5.5V	2.2V ~ 36V, ±1.1V ~ 18V	2V ~ 32V, ±1V ~ 16V
Voltage - Input Offset (Max)	7mV @ 5V	5mV @ 5V	7mV @ 5V	4.6mV	2mV @ 30V
Current - Input Bias (Max)	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.015µA	0.1µA @ 5V
Current - Output (Typ)	16nA @ 5V	16mA @ 5V	84mA @ 5V	20mA	16mA @ 5V
Current - Quiescent (Max)	2mA	2mA	350µA	75µA	2mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C
Package / Case	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)
Product Status	Obsolete	Active	Last Time Buy	Active	Active

Engineering Selection Recommendations

Pin-Compatible Direct Replacement (14-TSSOP Package):

AS339GTR-E1 (Diodes Incorporated) provides the closest functional match with identical package geometry and pin configuration. This part maintains the full supply voltage range (2V ~ 36V / ±1V ~ 18V) and meets all electrical parameter requirements. Product status is Active with established supply chain availability. MSL rating of 3 requires standard moisture control during storage and assembly.

LMV339IPW (Texas Instruments) offers pin-compatible substitution with extended output current capability (84mA typical vs. 16nA). Supply voltage range is restricted to 2.7V ~ 5.5V, limiting applicability to low-voltage designs. Product status is Last Time Buy, indicating limited future availability. MSL rating of 1 provides superior moisture tolerance.

TLV1704AIPWR (Texas Instruments) delivers pin-compatible substitution with superior input bias current performance (0.015µA vs. 0.25µA) and extended supply voltage range (2.2V ~ 36V / ±1.1V ~ 18V). Product status is Active with strong availability. Quiescent current of 75µA is lower than the LM2901PT specification, beneficial for low-power applications.

LM239APT (STMicroelectronics) provides pin-compatible substitution with the widest output type support matching the original device. Supply voltage range of 2V ~ 32V covers most applications within the LM2901PT envelope. Product status is Active. Operating temperature range extends to 105°C, slightly below the original 125°C maximum.

Alternative Package Substitutes (14-SOIC):

AS339AMTR-G1 (Diodes Incorporated) and LMV339M/NOPB (Texas Instruments) offer functional equivalence in 14-SOIC package format. These require PCB layout modification due to different pin spacing (0.154" vs. 0.173" width). Both maintain full electrical parameter compatibility and Active product status.

Selection Criteria by Application:

For designs requiring maximum supply voltage range and low quiescent current, TLV1704AIPWR is recommended. For applications prioritizing output current capability and extended temperature operation, LMV339IPW is suitable despite voltage range limitations. For general-purpose replacement with active product status and established supply, AS339GTR-E1 or LM239APT are optimal choices.

Frequently Asked Questions (FAQ)

Q: Can AS339GTR-E1 directly replace LM2901PT without PCB modification?

A: Yes. AS339GTR-E1 is pin-compatible with identical 14-TSSOP package dimensions (0.173", 4.40mm width) and pinout. No PCB layout changes are required. Electrical parameters meet or exceed LM2901PT specifications across all critical measurements.

Q: What is the impact of the reduced operating temperature range in AS339GTR-E1 (-40°C ~ 85°C vs. -40°C ~ 125°C)?

A: AS339GTR-E1 is suitable for applications operating within -40°C to 85°C. Designs requiring operation above 85°C must use LMV339IPW, TLV1704AIPWR, or LM239APT, which maintain the full -40°C ~ 125°C range.

Q: Why does LMV339IPW show higher output current (84mA) compared to LM2901PT (16nA)?

A: Output current specifications reflect different measurement conditions and device architecture. LMV339IPW's higher output current indicates greater drive capability, making it suitable for applications requiring direct load driving. The LM2901PT's lower specification reflects its original design intent. Both are functionally compatible as comparators.

Q: Is TLV1704AIPWR suitable for designs currently using LM2901PT?

A: TLV1704AIPWR is suitable for applications within its supply voltage range (2.2V ~ 36V / ±1.1V ~ 18V), which overlaps the LM2901PT envelope. Superior input bias current performance (0.015µA) and active product status make it a strong choice. Verify that your specific application does not require operation below 2.2V single supply or below ±1.1V dual supply.

Q: What packaging options are available if 14-TSSOP is unavailable?

A: 14-SOIC packages are available from Diodes Incorporated (AS339AMTR-G1) and Texas Instruments (LMV339M/NOPB). These require PCB layout modification due to different pin spacing. 14-QFN format is available as LMV339IRUCR (Texas Instruments) for space-constrained designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the LM2901PT specification. REACH status is Unaffected for all parts.

Q: What is the significance of MSL ratings in the substitute parts?

A: MSL (Moisture Sensitivity Level) indicates moisture absorption limits during storage. LM2901PT and LMV339IPW carry MSL 1 (unlimited storage). AS339GTR-E1 and TLV1704AIPWR carry MSL 3 and MSL 2 respectively, requiring standard moisture control during storage and assembly per IPC-A-610 guidelines. This does not affect performance in deployed applications.

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