LM7301IMX Equivalent & Substitute Parts

Part Overview

The LM7301IMX is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface-mount package. This device features rail-to-rail output capability and is designed for low-power analog signal processing applications. The LM7301IMX is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical performance parameters, package dimensions, and supply voltage specifications to ensure direct replacement capability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Slew Rate	1.25	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	103	nA
Voltage - Input Offset	40	µV
Current - Supply	720	µA
Current - Output / Channel	11.7	mA
Voltage - Supply Span (Min)	1.8	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	-40 to 85	°C

Substitute Part Grouping Explanation

Substitution eligibility for the LM7301IMX is determined by strict alignment of the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface-mount package to ensure PCB footprint compatibility without layout modifications.

Electrical Performance Envelope: Substitute parts must operate within the supply voltage range of 1.8 V to 32 V minimum and maximum. Rail-to-rail output capability is mandatory for functional equivalence.

Amplifier Classification: All substitutes must be single-circuit general-purpose operational amplifiers with rail-to-rail output architecture.

Thermal Operating Range: The base operating temperature range of -40°C to 85°C establishes the minimum acceptable thermal specification. Substitutes with extended temperature ranges (such as -40°C to 125°C) are acceptable as they exceed the original specification.

Compliance Status: Active product status and RoHS3 compliance are preferred for new designs, though the original part is obsolete and RoHS non-compliant.

The following substitute parts meet these criteria and are grouped by manufacturer and product line.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz / kHz)	Input Bias (nA / pA)	Supply Current (µA / mA)	Output Current (mA)	Temp Range (°C)	RoHS Status
LM7301IMX	Texas Instruments	Obsolete	1.25	4 MHz	103 nA	720 µA	11.7	-40 to 85	Non-compliant
LM7301IMX/NOPB	Texas Instruments	Active	1.25	4 MHz	103 nA	720 µA	—	-40 to 85	ROHS3 Compliant
LT1494CS8#PBF	Analog Devices Inc.	Active	0.001	2.7 kHz	25 pA	1.4 µA	1.5	0 to 70	ROHS3 Compliant
LT1494CS8#TRPBF	Analog Devices Inc.	Active	0.001	2.7 kHz	25 pA	1.4 µA	1.5	0 to 70	ROHS3 Compliant
LT1494HS8#PBF	Analog Devices Inc.	Active	0.001	2.7 kHz	25 pA	1.4 µA	1.5	-40 to 125	ROHS3 Compliant
LT1494IS8#PBF	Analog Devices Inc.	Active	0.001	2.7 kHz	25 pA	1.4 µA	1.5	-40 to 85	ROHS3 Compliant
LT1494IS8#TRPBF	Analog Devices Inc.	Active	0.001	2.7 kHz	25 pA	1.4 µA	1.5	-40 to 85	ROHS3 Compliant
LT1672CS8#PBF	Linear Technology	Active	0.005	12 kHz	25 pA	1.9 µA	1.5	0 to 70	Vendor Undefined
LT1672IS8#PBF	Analog Devices Inc.	Last Time Buy	0.005	12 kHz	25 pA	1.9 µA	1.5	-40 to 85	ROHS3 Compliant
OP184ESZ	Analog Devices Inc.	Active	4	4.25 MHz	80 nA	2.25 mA	10	-40 to 125	ROHS3 Compliant
OP184ESZ-REEL	Analog Devices Inc.	Active	4	4.25 MHz	80 nA	2.25 mA	10	-40 to 125	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

LM7301IMX/NOPB is the primary substitute. This part is the active production variant of the obsolete LM7301IMX, maintaining identical electrical specifications while achieving ROHS3 compliance. The packaging format (Tape & Reel) differs from the original, but the component itself is functionally identical. This part is recommended for designs requiring no performance changes and maximum compatibility assurance.

Performance-Matched Alternatives:

OP184ESZ and OP184ESZ-REEL provide electrical performance closely aligned with the LM7301IMX, with comparable slew rate (4 V/µs versus 1.25 V/µs) and gain bandwidth product (4.25 MHz versus 4 MHz). These parts are manufactured by Analog Devices Inc., carry active product status, and are ROHS3 compliant. Extended operating temperature range (-40°C to 125°C) exceeds the original specification. Higher supply current (2.25 mA versus 720 µA) and output current (10 mA versus 11.7 mA) must be evaluated for power budget impact in battery-powered or low-power applications.

Low-Power Alternatives:

LT1494 series parts (LT1494CS8#PBF, LT1494CS8#TRPBF, LT1494HS8#PBF, LT1494IS8#PBF, LT1494IS8#TRPBF) offer significantly reduced supply current (1.4 µA) and input bias current (25 pA), making them suitable for ultra-low-power applications. However, these parts exhibit substantially lower slew rate (0.001 V/µs) and gain bandwidth product (2.7 kHz), restricting their use to applications with relaxed frequency response requirements. Temperature range variants include 0°C to 70°C (commercial) and -40°C to 85°C (industrial) options. LT1494HS8#PBF extends the upper temperature limit to 125°C.

Precision Low-Power Alternative:

LT1672 series parts (LT1672CS8#PBF, LT1672IS8#PBF) provide intermediate performance between the LM7301IMX and LT1494 series, with slew rate of 0.005 V/µs and gain bandwidth product of 12 kHz. Supply current remains low at 1.9 µA. LT1672IS8#PBF carries Last Time Buy status, indicating limited future availability. RoHS compliance status for LT1672CS8#PBF is vendor-undefined.

Compliance Considerations:

All recommended substitutes except LT1672CS8#PBF carry ROHS3 compliance certification, meeting current environmental and regulatory requirements. The original LM7301IMX is RoHS non-compliant and should not be used in new designs subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can LM7301IMX/NOPB be used as a direct drop-in replacement for LM7301IMX?

A: Yes. LM7301IMX/NOPB maintains identical electrical specifications and package dimensions (8-SOIC, 0.154" width). The primary difference is packaging format (Tape & Reel versus tube) and RoHS3 compliance status. No circuit modifications are required.

Q: What is the key difference between LT1494 and LT1672 series substitutes?

A: LT1494 series operates at 2.7 kHz gain bandwidth product with 0.001 V/µs slew rate, optimized for ultra-low-power applications. LT1672 series provides higher bandwidth (12 kHz) and faster slew rate (0.005 V/µs) while maintaining low supply current (1.9 µA). Selection depends on frequency response requirements.

Q: Why does OP184ESZ consume more supply current than the LM7301IMX?

A: OP184ESZ is designed for higher performance, delivering 4 V/µs slew rate and 4.25 MHz gain bandwidth product compared to LM7301IMX specifications of 1.25 V/µs and 4 MHz. Higher performance capability requires increased quiescent current (2.25 mA versus 720 µA). This trade-off is acceptable in applications where power consumption is not the primary constraint.

Q: Are all substitute parts available in 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface-mount package, ensuring PCB footprint compatibility without layout redesign.

Q: What is the significance of "Last Time Buy" status for LT1672IS8#PBF?

A: Last Time Buy status indicates that Analog Devices Inc. will discontinue this part after a specified date. Existing inventory may be available, but long-term supply cannot be guaranteed. For new designs requiring extended production life, alternative parts with Active status are recommended.

Q: Can LT1494 series parts replace LM7301IMX in high-frequency applications?

A: No. LT1494 series gain bandwidth product (2.7 kHz) is substantially lower than LM7301IMX (4 MHz). These parts are unsuitable for applications requiring signal frequencies above approximately 270 Hz. OP184ESZ or LM7301IMX/NOPB are appropriate for high-frequency requirements.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in Tube, Tape & Reel (TR), and Bulk packaging formats. Tube packaging is standard for manual assembly; Tape & Reel format is optimized for automated pick-and-place equipment. Packaging selection does not affect component electrical performance.

Q: Is RoHS3 compliance mandatory for all new designs?

A: RoHS3 compliance is required for products sold in the European Union and many other jurisdictions. All recommended substitutes except LT1672CS8#PBF carry ROHS3 certification. The original LM7301IMX is non-compliant and should not be specified for new designs subject to RoHS regulations.

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