LM2903PT Equivalent & Substitute Parts

Part Overview

The LM2903PT is a dual general-purpose comparator IC manufactured by Rohm Semiconductor in 8-TSSOP surface-mount packaging. This device features open-collector, rail-to-rail output configuration with a supply voltage range of 2V to 36V (single) or ±1V to ±18V (dual). The LM2903PT is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2903PT
Manufacturer	Rohm Semiconductor
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Number of Elements	2
Output Type	Open-Collector, Rail-to-Rail
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)	2.5mA
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM2903PT is determined by the following critical parameters:

Primary Substitution Criteria:

Number of Elements: 2 (dual comparator)
Output Type: Open-Collector, Rail-to-Rail
Voltage - Supply, Single/Dual (±): 2V ~ 36V, ±1V ~ 18V
Operating Temperature: -40°C ~ 125°C
Package / Case: 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Voltage - Input Offset (Max): 7mV @ 5V
Current - Input Bias (Max): 0.25µA @ 5V
Current - Quiescent (Max): 2.5mA
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Direct Substitutes (Identical Package & Electrical Specifications): Parts that maintain the same 8-TSSOP package, identical supply voltage range, and equivalent electrical performance characteristics. These include LM2903PWRG3, LM2903QPWRG4Q1, LM2903QPWRQ1, LM2903VQPWRG4Q1, and LM2903VQPWRQ1 from Texas Instruments, and LM2903VQPWR from Rohm Semiconductor.

Functional Equivalents (Different Package, Compatible Electrical Specifications): The LM2903P from Texas Instruments provides functional equivalence with identical electrical specifications but uses 8-PDIP through-hole packaging instead of surface mount. This part is suitable for applications where through-hole assembly is required.

Similar Alternatives (Comparable Performance, Minor Parameter Variations): The LM293PT and LM393PT from STMicroelectronics offer comparable dual-comparator functionality with minor variations in input offset voltage and operating temperature range. The AZV393MMTR-E1 from Diodes Incorporated provides similar functionality but with restricted supply voltage range (2.5V ~ 5.5V) and higher quiescent current (200µA).

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Supply Voltage	Input Offset (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Product Status
LM2903PT	Rohm Semiconductor	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	16mA @ 5V	2.5mA	-40°C ~ 125°C	Obsolete
LM2903P	Texas Instruments	8-DIP	Through Hole	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	20mA	2.5mA	-40°C ~ 125°C	Active
LM2903PWRG3	Texas Instruments	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	7mV @ 30V	20mA	2.5mA	-40°C ~ 125°C	Active
LM2903QPWRG4Q1	Texas Instruments	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	20mA	2.5mA	-40°C ~ 125°C	Active
LM2903QPWRQ1	Texas Instruments	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	20mA	2.5mA	-40°C ~ 125°C	Active
LM2903VQPWR	Rohm Semiconductor	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	20mA	2.5mA	-40°C ~ 125°C	Obsolete
LM2903VQPWRG4Q1	Texas Instruments	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	20mA	2.5mA	-40°C ~ 125°C	Active
LM2903VQPWRQ1	Texas Instruments	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	7mV @ 5V	20mA	2.5mA	-40°C ~ 125°C	Active
LM293PT	STMicroelectronics	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	18mA @ 5V	2.5mA	-40°C ~ 105°C	Active
LM393PT	STMicroelectronics	8-TSSOP	Surface Mount	2V ~ 36V, ±1V ~ 18V	5mV @ 30V	18mA @ 5V	2.5mA	0°C ~ 70°C	Active
AZV393MMTR-E1	Diodes Incorporated	8-MSOP	Surface Mount	2.5V ~ 5.5V	7mV @ 5V	84mA @ 5V	200µA	-40°C ~ 85°C	Active

Engineering Selection Recommendations

For Direct Replacement (Same Package, Surface Mount): Select LM2903PWRG3, LM2903QPWRG4Q1, or LM2903QPWRQ1 from Texas Instruments. All three maintain the 8-TSSOP package, identical supply voltage specifications, and operating temperature range of -40°C to 125°C. These parts are in active production status. The LM2903QPWRG4Q1 and LM2903QPWRQ1 variants include AEC-Q100 automotive qualification, suitable for automotive-grade applications.

For Automotive Applications: LM2903QPWRG4Q1 and LM2903QPWRQ1 from Texas Instruments are qualified to AEC-Q100 standard and carry automotive-grade designation. LM2903VQPWRG4Q1 and LM2903VQPWRQ1 from Texas Instruments also provide automotive qualification with identical electrical specifications.

For Through-Hole Assembly: LM2903P from Texas Instruments provides functional equivalence with 8-PDIP through-hole packaging. This part maintains identical supply voltage range and operating temperature specifications but is suitable only for through-hole PCB assembly processes.

For Extended Temperature Range: LM2903PT, LM2903PWRG3, LM2903QPWRG4Q1, LM2903QPWRQ1, and all Texas Instruments variants maintain the -40°C to 125°C operating range. LM393PT from STMicroelectronics is restricted to 0°C to 70°C and is not suitable for extended low-temperature applications.

For Restricted Supply Voltage Applications: AZV393MMTR-E1 from Diodes Incorporated is limited to 2.5V to 5.5V supply voltage and is not suitable for applications requiring the full 2V to 36V range of the LM2903PT.

Frequently Asked Questions (FAQ)

Q: Can LM2903P (8-DIP) be used as a direct replacement for LM2903PT (8-TSSOP)?

A: LM2903P provides electrical equivalence with identical supply voltage range and operating temperature specifications. However, it uses 8-PDIP through-hole packaging instead of 8-TSSOP surface mount. Substitution is possible only if the PCB assembly process and footprint support through-hole components. Pin-to-pin compatibility exists, but physical package dimensions differ significantly.

Q: What is the difference between LM2903QPWRG4Q1 and LM2903QPWRQ1?

A: Both parts are from Texas Instruments with identical electrical specifications and 8-TSSOP packaging. The primary difference is packaging format: LM2903QPWRG4Q1 is supplied in Tape & Reel (TR) format, while LM2903QPWRQ1 is supplied in Cut Tape (CT) & Digi-Reel format. Both carry AEC-Q100 automotive qualification. Selection depends on procurement and assembly equipment compatibility.

Q: Is LM393PT suitable as a substitute for LM2903PT?

A: LM393PT from STMicroelectronics maintains the same 8-TSSOP package and comparable electrical specifications. However, the operating temperature range is restricted to 0°C to 70°C, compared to -40°C to 125°C for LM2903PT. Substitution is valid only for applications operating within the 0°C to 70°C range.

Q: Why is AZV393MMTR-E1 not recommended as a direct substitute?

A: AZV393MMTR-E1 from Diodes Incorporated has a restricted supply voltage range of 2.5V to 5.5V, compared to 2V to 36V for LM2903PT. Additionally, quiescent current is significantly higher at 200µA versus 2.5mA. This part is suitable only for low-voltage applications within its specified voltage range.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance status, consistent with the original LM2903PT specification.

Q: What is the significance of AEC-Q100 qualification on LM2903QPWRG4Q1 and LM2903QPWRQ1?

A: AEC-Q100 qualification indicates these parts meet automotive industry reliability and quality standards. Selection of AEC-Q100 qualified variants is required for automotive applications subject to automotive supply chain requirements.

Q: Can LM2903VQPWR be used despite its obsolete status?

A: LM2903VQPWR from Rohm Semiconductor is classified as obsolete but maintains identical electrical specifications to LM2903PT in the same 8-TSSOP package. Existing inventory may be available, but long-term procurement is not assured. Active production alternatives from Texas Instruments are recommended for new designs.

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