LF347M Equivalent & Substitute Parts

Part Overview

The LF347M is a J-FET input operational amplifier containing four independent circuits in a 14-SOIC surface mount package, manufactured by Texas Instruments. This device is classified as obsolete but remains in stock with 1,448 units available. The LF347M operates across a supply voltage range of 10V to 36V and is suitable for applications requiring low input bias current and moderate bandwidth performance.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term availability assurance, and potential performance optimization. Active alternatives from multiple manufacturers provide enhanced specifications while maintaining functional compatibility within the same package footprint.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Slew Rate	13	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	5	mV
Current - Supply	7.2 (x4 Channels)	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LF347M is determined by the following critical parameters:

Primary Substitution Criteria:

Package compatibility: 14-SOIC surface mount form factor
Circuit count: Four independent amplifier circuits
Amplifier topology: J-FET input stage for low input bias current
Supply voltage range: Minimum 10V to maximum 36V overlap
Operating temperature range: Minimum 0°C to maximum 70°C overlap

Secondary Compatibility Factors:

Slew rate: 13V/µs or greater
Gain bandwidth product: 4 MHz or greater
Input bias current: 50 pA or lower
Input offset voltage: 5 mV or lower

Substitute parts are grouped into two categories:

Category 1: Direct Texas Instruments LF347 Series Variants These parts share identical base product number (LF347) and are available in different packaging configurations (Tube, Cut Tape & Digi-Reel). All maintain J-FET topology with identical electrical specifications.

Category 2: Alternative Manufacturer J-FET Amplifiers These parts from STMicroelectronics (LF247DT, LF347D, LF347DT) and Analog Devices (ADA4000-4ARZ, ADA4000-4ARZ-R7) provide J-FET input stages with enhanced performance characteristics while maintaining 14-SOIC package compatibility and four-circuit configuration.

Category 3: General Purpose Amplifiers Parts from onsemi (LM2902EDR2G, LM324ADR2G, NCV34074VDR2G) offer four-circuit 14-SOIC packages with general purpose topology. These represent functional alternatives where J-FET input characteristics are not mandatory.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Status
LF347M	Texas Instruments	J-FET	13	4	50	5	7.2	10	36	0 to 70	Obsolete
LF347M/NOPB	Texas Instruments	J-FET	13	4	50	5	7.2	10	36	0 to 70	Active
LF347MX/NOPB	Texas Instruments	J-FET	13	4	50	5	7.2	10	36	0 to 70	Active
ADA4000-4ARZ	Analog Devices Inc.	J-FET	20	5	5	0.2	1.35	8	36	-40 to 125	Active
ADA4000-4ARZ-R7	Analog Devices Inc.	J-FET	20	5	5	0.2	1.35	8	36	-40 to 125	Active
LF247DT	STMicroelectronics	J-FET	16	4	20	3	1.4	44	44	-40 to 105	Active
LF347D	STMicroelectronics	J-FET	16	3	20	3	1.4	44	44	0 to 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	20	3	1.4	44	44	0 to 70	Active
LM2902EDR2G	onsemi	General Purpose	—	—	90	2	—	3	32	-40 to 105	Active
LM324ADR2G	onsemi	General Purpose	—	1	40	2	1.5	3	32	0 to 70	Active
NCV34074VDR2G	onsemi	General Purpose	13	4.5	100	1	1.9	3	44	-40 to 125	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications):

LF347M/NOPB and LF347MX/NOPB are direct functional equivalents manufactured by Texas Instruments with identical electrical and thermal specifications. Both are active products with higher inventory availability (1,516 and 25,200 units respectively). LF347MX/NOPB offers the highest stock level and is available in Cut Tape & Digi-Reel packaging, suitable for high-volume production environments.

Enhanced Performance Alternatives (J-FET Topology):

ADA4000-4ARZ and ADA4000-4ARZ-R7 from Analog Devices provide superior performance characteristics: 20V/µs slew rate (versus 13V/µs), 5 MHz gain bandwidth product (versus 4 MHz), and significantly lower input bias current (5 pA versus 50 pA). These devices support extended operating temperature range (-40°C to 125°C) and lower supply voltage minimum (8V). Both maintain 14-SOIC package compatibility and J-FET input stage topology.

LF247DT and LF347DT from STMicroelectronics offer improved slew rate (16V/µs) and lower input bias current (20 pA) while maintaining 4 MHz gain bandwidth product. LF347DT matches the original operating temperature range (0°C to 70°C). Both devices are available in high quantities (17,352 and 27,321 units).

Functional Alternatives (General Purpose Topology):

NCV34074VDR2G from onsemi provides general purpose amplifier topology with 13V/µs slew rate and 4.5 MHz gain bandwidth product, matching or exceeding LF347M performance in these parameters. This device supports extended temperature range (-40°C to 125°C) and wider supply voltage range (3V to 44V). Input bias current is higher (100 nA) but remains suitable for general purpose applications.

LM324ADR2G and LM2902EDR2G are general purpose alternatives with lower supply voltage minimums (3V) but reduced bandwidth performance. These are appropriate only for applications where J-FET input characteristics are not required.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, matching the original LF347M certifications. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can LF347M/NOPB be used as a direct replacement for LF347M?

A: Yes. LF347M/NOPB is manufactured by Texas Instruments with identical electrical specifications, package configuration, and operating parameters. The primary difference is product status (Active versus Obsolete) and packaging format (Tube). Both are pin-compatible and functionally equivalent.

Q: What is the difference between LF347MX/NOPB and LF347M/NOPB?

A: Both parts share identical electrical specifications and 14-SOIC package footprint. The primary distinction is packaging format: LF347MX/NOPB is supplied in Cut Tape & Digi-Reel format suitable for automated assembly, while LF347M/NOPB is supplied in Tube format. Electrical performance is identical.

Q: Can ADA4000-4ARZ replace LF347M in all applications?

A: ADA4000-4ARZ maintains 14-SOIC package compatibility and four-circuit J-FET configuration. It provides enhanced specifications: higher slew rate (20V/µs versus 13V/µs), higher gain bandwidth product (5 MHz versus 4 MHz), and significantly lower input bias current (5 pA versus 50 pA). The device supports lower minimum supply voltage (8V versus 10V) and extended temperature range (-40°C to 125°C versus 0°C to 70°C). Applications requiring the original specifications can use this part; applications sensitive to input bias current benefit from this substitute.

Q: What are the key differences between J-FET and general purpose amplifier alternatives?

A: J-FET input amplifiers (LF347M, ADA4000-4ARZ, LF247DT, LF347DT) feature extremely low input bias current (5 to 50 pA range), making them suitable for high-impedance signal sources and precision measurement applications. General purpose amplifiers (LM324ADR2G, LM2902EDR2G, NCV34074VDR2G) have higher input bias current (40 to 100 nA range) but offer lower supply voltage minimums and wider operating ranges. Selection depends on application requirements for input impedance and signal source characteristics.

Q: Are STMicroelectronics LF347D and LF347DT compatible with LF347M?

A: Both STMicroelectronics parts maintain 14-SOIC package compatibility and four-circuit J-FET configuration. LF347DT provides identical 4 MHz gain bandwidth product and matches the 0°C to 70°C operating temperature range. Input bias current is lower (20 pA versus 50 pA) and slew rate is higher (16V/µs versus 13V/µs). These represent performance improvements while maintaining functional compatibility. LF347D has reduced gain bandwidth product (3 MHz) and is suitable only for applications not requiring 4 MHz performance.

Q: What packaging options are available for LF347 equivalents?

A: Texas Instruments offers LF347M/NOPB in Tube packaging and LF347MX/NOPB in Cut Tape & Digi-Reel format. STMicroelectronics provides LF347D in Tube and LF347DT in Cut Tape & Digi-Reel. Analog Devices supplies ADA4000-4ARZ in Tube and ADA4000-4ARZ-R7 in Cut Tape & Digi-Reel. All maintain identical 14-SOIC package footprint; packaging selection depends on assembly process requirements.

Q: Does supply voltage range affect substitution compatibility?

A: Yes. LF347M operates from 10V to 36V. ADA4000-4ARZ operates from 8V to 36V (lower minimum). STMicroelectronics LF247DT and LF347DT specify 44V fixed supply (not a range). General purpose alternatives (LM324ADR2G, LM2902EDR2G) operate from 3V to 32V. Applications requiring 10V to 36V operation are compatible with all J-FET alternatives. Applications requiring lower supply voltages (below 10V) require ADA4000 series or general purpose alternatives.

Q: What is the significance of input offset voltage differences?

A: LF347M specifies 5 mV input offset voltage. ADA4000-4ARZ specifies 200 µV (0.2 mV), representing 25-fold improvement. STMicroelectronics LF247DT and LF347DT specify 3 mV. NCV34074VDR2G specifies 1 mV. Lower input offset voltage reduces DC errors in precision applications. Applications sensitive to DC accuracy benefit from lower offset voltage specifications; general signal processing applications are unaffected by these differences.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the original LF347M certification. All parts also maintain MSL Level 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message