LF351M Equivalent & Substitute Parts

Part Overview

The LF351M is a J-FET operational amplifier manufactured by onsemi, housed in an 8-SOP surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LF351M serves as a single-circuit J-FET amplifier suitable for applications requiring low input bias current and moderate bandwidth performance. Identification of compatible alternatives ensures design flexibility and supply chain resilience.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	13	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	5	mV
Current - Supply	2.3	mA
Operating Temperature	0 to 70	°C
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LF351M is determined by compatibility across the following critical parameters: amplifier type (J-FET), number of circuits (1), package type (8-SOIC surface mount), operating temperature range (0°C to 70°C), and electrical performance metrics (slew rate, gain bandwidth product, input bias current, input offset voltage, and supply current).

Substitute parts are grouped into two categories:

Category 1: Direct LF351 Base Product Variants — Parts sharing the LF351 base product number with identical or superior electrical performance and active product status. These include LF351D and LF351DT from STMicroelectronics, which maintain the same package and circuit count while offering improved specifications.

Category 2: Enhanced Performance Alternatives — Parts with different base product numbers (LF356, TL061, TL071) that maintain J-FET amplifier topology, single-circuit configuration, and 8-SOIC packaging. These devices offer varying slew rates, bandwidth, and supply current characteristics suitable for applications with different performance requirements.

All substitute candidates operate within the 0°C to 70°C temperature range or extended ranges, maintain surface mount 8-SOIC packaging, and comply with REACH and RoHS3 standards where applicable.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Current (mA)	Temp Range (°C)
LF351M	onsemi	Obsolete	13	4	50	5	2.3	0 to 70
LF351D	STMicroelectronics	Active	16	4	20	3	1.4	0 to 70
LF351DT	STMicroelectronics	Active	16	4	20	3	1.4	0 to 70
LF356M/NOPB	Texas Instruments	Active	12	5	30	3	5	0 to 70
LF356MX/NOPB	Texas Instruments	Active	12	5	30	3	5	0 to 70
TL061ACDT	STMicroelectronics	Active	3.5	1	30	3	0.2	0 to 70
TL061CDT	STMicroelectronics	Active	3.5	1	30	3	0.2	0 to 70
TL061IDT	STMicroelectronics	Active	3.5	1	30	3	0.2	-40 to 105
TL071ACDT	STMicroelectronics	Active	16	4	20	3	1.4	0 to 70
TL071CDR	Texas Instruments	Active	13	5.25	65	3	1.4	0 to 70
TL071CDT	STMicroelectronics	Active	16	4	20	3	1.4	0 to 70

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LF351D and LF351DT from STMicroelectronics are the preferred direct substitutes. Both devices share the LF351 base product number and maintain identical circuit count and package specifications. These parts demonstrate active product status with RoHS3 compliance and improved electrical performance relative to the obsolete LF351M, including reduced input bias current (20 pA versus 50 pA), lower input offset voltage (3 mV versus 5 mV), and reduced supply current (1.4 mA versus 2.3 mA). The LF351DT variant offers superior inventory availability (17,545 units) in Cut Tape and Digi-Reel packaging.

Secondary Substitutes (Performance-Matched Alternatives):

TL071ACDT and TL071CDT from STMicroelectronics provide electrical performance closely aligned with the LF351M, with matching slew rate (16 V/µs and 13 V/µs respectively) and gain bandwidth product (4 MHz). These devices maintain active product status, RoHS3 compliance, and identical operating temperature range. TL071CDT offers substantial inventory (6,375 units).

TL071CDR from Texas Instruments presents an alternative with comparable slew rate (13 V/µs) and superior gain bandwidth product (5.25 MHz), though with slightly elevated input bias current (65 pA).

Tertiary Substitutes (Extended Performance Range):

LF356M/NOPB and LF356MX/NOPB from Texas Instruments offer enhanced gain bandwidth product (5 MHz) and active product status with RoHS3 compliance. These devices are suitable for applications requiring higher bandwidth performance. LF356MX/NOPB demonstrates exceptional inventory availability (90,234 units).

Low-Power Alternative:

TL061CDT and TL061ACDT from STMicroelectronics provide ultra-low supply current (0.2 mA) for power-constrained applications, though with reduced slew rate (3.5 V/µs) and gain bandwidth product (1 MHz).

All recommended substitutes maintain 8-SOIC surface mount packaging, J-FET amplifier topology, single-circuit configuration, and REACH compliance. Selection should be based on specific application requirements for slew rate, bandwidth, input bias current, and power consumption.

Frequently Asked Questions (FAQ)

Q: Can LF351D or LF351DT directly replace the LF351M without circuit modification?

A: Yes. Both LF351D and LF351DT share the LF351 base product number and maintain identical package (8-SOIC), circuit count (1), and operating temperature range (0°C to 70°C). Electrical performance is equal or superior across all specified parameters. No circuit modification is required.

Q: What is the primary difference between LF351D and LF351DT?

A: Both devices are electrically identical. The difference is packaging format: LF351D is supplied in Tube packaging, while LF351DT is supplied in Cut Tape and Digi-Reel format. Selection depends on assembly process requirements and inventory management preferences.

Q: How do TL071 devices compare to the LF351M?

A: TL071ACDT and TL071CDT offer comparable slew rate and gain bandwidth product to the LF351M with improved input bias current (20 pA versus 50 pA) and lower supply current (1.4 mA versus 2.3 mA). TL071CDR from Texas Instruments provides similar slew rate with enhanced bandwidth (5.25 MHz). All maintain the same package and operating temperature range.

Q: Are there performance trade-offs when selecting TL061 devices?

A: Yes. TL061 variants (TL061ACDT, TL061CDT, TL061IDT) provide significantly reduced supply current (0.2 mA) suitable for battery-powered applications. However, they offer reduced slew rate (3.5 V/µs versus 13 V/µs) and lower gain bandwidth product (1 MHz versus 4 MHz). Selection should be based on application power budget and bandwidth requirements.

Q: What is the difference between TL061CDT and TL061IDT?

A: Both devices are electrically identical with identical packaging. The primary difference is operating temperature range: TL061CDT operates 0°C to 70°C, while TL061IDT operates -40°C to 105°C. TL061IDT is suitable for extended temperature applications.

Q: Do all substitute parts comply with RoHS3 and REACH standards?

A: All substitute parts listed maintain RoHS3 compliance and REACH Unaffected status, matching the compliance profile of the LF351M. This ensures regulatory compatibility for new designs and production continuity.

Q: Which substitute offers the best inventory availability?

A: LF356MX/NOPB from Texas Instruments provides the highest inventory availability at 90,234 units in Cut Tape and Digi-Reel packaging. TL071CDR from Texas Instruments offers 90,400 units. Both are suitable for high-volume production requirements.

Q: Can LF356 devices be used as substitutes despite different base product numbers?

A: Yes. LF356M/NOPB and LF356MX/NOPB maintain J-FET amplifier topology, single-circuit configuration, 8-SOIC packaging, and identical operating temperature range. They offer enhanced gain bandwidth product (5 MHz versus 4 MHz) and active product status. Electrical performance is compatible with LF351M applications requiring higher bandwidth.

Q: What packaging options are available across substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (LF351D), Cut Tape and Digi-Reel (LF351DT, LF356MX/NOPB, TL061CDT, TL071CDT, TL071CDR), Tape and Reel (TL061ACDT), and Cut Tape (TL071ACDT). Selection depends on assembly process compatibility and inventory management requirements.

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