LM7321MA/NOPB Equivalent & Substitute Parts

Part Overview

The LM7321MA/NOPB 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 applications requiring single-circuit amplification with moderate bandwidth and slew rate performance. The part is currently in Last Time Buy status, indicating that Texas Instruments has discontinued this product line. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for existing applications or new designs requiring comparable performance characteristics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	18	V/µs
Gain Bandwidth Product	20	MHz
Current - Input Bias	1.1	µA
Voltage - Input Offset	700	µV
Current - Supply	1.1	mA
Current - Output / Channel	100	mA
Voltage - Supply Span (Min)	2.5	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	-40 to 125	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM7321MA/NOPB is determined by compatibility across the following critical parameters:

Package and Mounting Compatibility: All substitute parts must use the 8-SOIC surface mount package with 0.154" (3.90mm) width to ensure direct PCB footprint compatibility.

Electrical Performance Envelope: Substitute parts must operate within the specified supply voltage range (2.5 V to 32 V minimum and maximum) and support the required output current capability (100 mA per channel). The rail-to-rail output type is a functional requirement for this application category.

Thermal Operating Range: The LM7321MA/NOPB operates from -40°C to 125°C. Substitute parts with narrower temperature ranges may be acceptable depending on application requirements, but this parameter defines the operational envelope.

Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and MSL rating of 1 (Unlimited) to ensure compatibility with manufacturing processes and environmental regulations.

The substitute parts listed below are grouped into two categories: direct equivalents from Texas Instruments (LM7321MAX/NOPB) and alternative general-purpose amplifiers from Analog Devices Inc. and Linear Technology that meet the core electrical and mechanical requirements.

Parameter Comparison

Parameter	LM7321MA/NOPB	LM7321MAX/NOPB	LT1494CS8#PBF	LT1494CS8#TRPBF	LT1494HS8#PBF	LT1494IS8#PBF	LT1494IS8#TRPBF	LT1672CS8#PBF	LT1672IS8#PBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Linear Technology	Analog Devices Inc.
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1	1	1	1
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	18	18	0.001	0.001	0.001	0.001	0.001	0.005	0.005
Gain Bandwidth Product (MHz)	20	20	0.0027	0.0027	0.0027	0.0027	0.0027	0.012	0.012
Current - Input Bias (µA)	1.1	1.1	0.000025	0.000025	0.000025	0.000025	0.000025	0.000025	0.000025
Voltage - Input Offset (µV)	700	700	200	200	200	200	200	200	200
Current - Supply (mA)	1.1	1.1	0.0014	0.0014	0.0014	0.0014	0.0014	0.0019	0.0019
Current - Output / Channel (mA)	100	100	1.5	1.5	1.5	1.5	1.5	1.5	1.5
Voltage - Supply Span Min (V)	2.5	2.5	2.2	2.2	2.2	2.2	2.2	2.2	2.2
Voltage - Supply Span Max (V)	32	32	36	36	36	36	36	36	36
Operating Temperature (°C)	-40 to 125	-40 to 125	0 to 70	0 to 70	-40 to 125	-40 to 85	-40 to 85	0 to 70	-40 to 85
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	REACH Unaffected	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Vendor Undefined	1 (Unlimited)
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active	Active	Last Time Buy

Engineering Selection Recommendations

Primary Recommendation: LM7321MAX/NOPB

The LM7321MAX/NOPB is the direct equivalent substitute for the LM7321MA/NOPB. Both parts are manufactured by Texas Instruments and share identical electrical specifications, including slew rate (18 V/µs), gain bandwidth product (20 MHz), and output current capability (100 mA). The LM7321MAX/NOPB is currently in Active product status, ensuring long-term availability and supply chain stability. The primary difference is packaging format: LM7321MAX/NOPB is supplied in Cut Tape (CT) and Digi-Reel format, whereas the original part is supplied in Tube packaging. Both maintain ROHS3 compliance and MSL rating of 1 (Unlimited). This part is the recommended choice for direct replacement in existing designs.

Secondary Recommendations: LT1494 Series (Analog Devices Inc.)

The LT1494 series operational amplifiers (LT1494CS8#PBF, LT1494CS8#TRPBF, LT1494HS8#PBF, LT1494IS8#PBF, LT1494IS8#TRPBF) are alternative general-purpose amplifiers with rail-to-rail output capability and 8-SOIC packaging. These parts are suitable for applications where lower input bias current (25 pA versus 1.1 µA) and lower input offset voltage (200 µV versus 700 µV) are beneficial. However, the LT1494 series exhibits significantly lower slew rate (0.001 V/µs versus 18 V/µs) and lower gain bandwidth product (2.7 kHz versus 20 MHz), making them unsuitable for high-speed or high-frequency applications. Selection among LT1494 variants depends on operating temperature requirements: LT1494HS8#PBF supports -40°C to 125°C (matching the original part), while LT1494IS8#PBF and LT1494IS8#TRPBF support -40°C to 85°C, and LT1494CS8#PBF and LT1494CS8#TRPBF support 0°C to 70°C. All LT1494 variants maintain ROHS3 compliance and MSL rating of 1 (Unlimited).

Tertiary Recommendations: LT1672 Series (Linear Technology / Analog Devices Inc.)

The LT1672 series (LT1672CS8#PBF and LT1672IS8#PBF) represents a middle-ground option between the LM7321MA/NOPB and LT1494 series. These precision rail-to-rail amplifiers offer improved slew rate (0.005 V/µs) and gain bandwidth product (12 kHz) compared to the LT1494 series, though still lower than the LM7321MA/NOPB. Input bias current and input offset voltage match the LT1494 series (25 pA and 200 µV respectively). LT1672IS8#PBF is currently in Last Time Buy status, indicating discontinuation. LT1672CS8#PBF is Active but has undefined MSL rating. Operating temperature ranges are 0°C to 70°C for LT1672CS8#PBF and -40°C to 85°C for LT1672IS8#PBF. These parts are suitable for applications requiring lower power consumption and improved precision but not requiring the high-speed performance of the LM7321MA/NOPB.

Packaging and Compliance Considerations

All recommended substitute parts maintain the 8-SOIC surface mount package format, ensuring PCB footprint compatibility. Packaging format differences (Tube, Cut Tape, Digi-Reel, Tape & Reel) do not affect electrical performance or board-level compatibility. All parts except LT1672CS8#PBF maintain ROHS3 compliance and MSL rating of 1 (Unlimited), meeting standard manufacturing and environmental requirements. Selection should prioritize parts with Active product status to ensure long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM7321MA/NOPB with LM7321MAX/NOPB on my PCB?

A: Yes. Both parts share identical electrical specifications and the same 8-SOIC package footprint. The only difference is the packaging format (Tube versus Cut Tape/Digi-Reel). No circuit modifications or PCB layout changes are required.

Q: What is the key difference between LM7321MA/NOPB and the LT1494 series?

A: The LM7321MA/NOPB has significantly higher slew rate (18 V/µs versus 0.001 V/µs) and higher gain bandwidth product (20 MHz versus 2.7 kHz). The LT1494 series has lower input bias current (25 pA versus 1.1 µA) and lower input offset voltage (200 µV versus 700 µV). The LM7321MA/NOPB is suitable for high-speed applications, while the LT1494 series is optimized for low-power, precision applications.

Q: Can I use LT1494CS8#PBF in an application requiring -40°C to 125°C operation?

A: No. LT1494CS8#PBF operates only from 0°C to 70°C. For the full -40°C to 125°C temperature range, use LT1494HS8#PBF. For -40°C to 85°C operation, use LT1494IS8#PBF or LT1494IS8#TRPBF.

Q: What does "Last Time Buy" status mean for LM7321MA/NOPB?

A: Last Time Buy indicates that Texas Instruments has discontinued this product and will no longer manufacture it after a specified date. Existing inventory may still be available, but long-term supply cannot be guaranteed. Transitioning to an Active product such as LM7321MAX/NOPB or an alternative part is recommended for new designs.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts except LT1672CS8#PBF are explicitly ROHS3 compliant. LT1672CS8#PBF has REACH Unaffected status but does not specify RoHS3 compliance. Verify compliance requirements with your manufacturing process before selecting this part.

Q: What is the difference between LT1494IS8#PBF and LT1494IS8#TRPBF?

A: Both parts have identical electrical specifications and operating temperature range (-40°C to 85°C). The difference is packaging format: LT1494IS8#PBF is supplied in Tube, while LT1494IS8#TRPBF is supplied in Tape & Reel (TR). Select based on your assembly process requirements.

Q: Can I use LT1672 series as a direct replacement for LM7321MA/NOPB?

A: LT1672 series parts are not direct replacements due to significantly lower slew rate (0.005 V/µs versus 18 V/µs) and gain bandwidth product (12 kHz versus 20 MHz). They are suitable only for applications that do not require high-speed performance. Verify application requirements before substitution.

Q: What is the MSL rating and why does it matter?

A: MSL (Moisture Sensitivity Level) rating of 1 (Unlimited) means the component has no moisture sensitivity restrictions and can be stored indefinitely without special handling. All recommended parts except LT1672CS8#PBF have this rating, ensuring compatibility with standard manufacturing processes. LT1672CS8#PBF has undefined MSL rating; contact the supplier for specific handling requirements.

Q: Which substitute part has the lowest power consumption?

A: The LT1494 series and LT1672 series have significantly lower supply current (1.4 µA to 1.9 µA) compared to the LM7321MA/NOPB (1.1 mA). For ultra-low-power applications, the LT1494 series is the optimal choice. However, this comes at the cost of reduced slew rate and gain bandwidth product.

Q: Is the 8-SOIC package the same across all substitute parts?

A: Yes. All substitute parts use the 8-SOIC package with 0.154" (3.90mm) width, ensuring identical PCB footprint compatibility. No layout modifications are required when switching between these parts.

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