LF347N Equivalent & Substitute Parts

Part Overview

The LF347N is a J-FET input operational amplifier containing four independent circuits in a 14-pin DIP package. Manufactured by onsemi, this device is classified as obsolete. The LF347N operates across a supply voltage range of 7V to 36V and is designed for applications requiring low input bias current and stable gain characteristics across the audio frequency spectrum.

Due to its obsolete product status, sourcing original LF347N units from onsemi may present supply chain challenges. Equivalent and substitute parts listed in this reference provide functional alternatives with comparable electrical characteristics and identical mechanical packaging, enabling direct replacement in existing designs.

Substiute Parts

LF347N

onsemiIn Stock: 40474LF347N Datasheet

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LF347N

STMicroelectronicsIn Stock: 40463LF347N Datasheet

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LF347BN

onsemiIn Stock: 8285LF347BN Datasheet

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LF347BN/NOPB

Texas InstrumentsIn Stock: 2182LF347BN/NOPB Datasheet

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LF347N/NOPB

Texas InstrumentsIn Stock: 1383LF347N/NOPB Datasheet

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OP11EPZ

Analog Devices Inc.In Stock: 2179OP11EPZ Datasheet

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TL084CN

STMicroelectronicsIn Stock: 25130TL084CN Datasheet

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TL084IN

STMicroelectronicsIn Stock: 2386TL084IN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LF347N is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Amplifier Type: J-FET input architecture
• Number of Circuits: Four independent operational amplifiers
• Gain Bandwidth Product: 4 MHz nominal
• Slew Rate: 13 V/µs minimum
• Input Bias Current: 50 pA maximum
• Supply Voltage Range: 7V to 36V operation
• Input Offset Voltage: 5 mV maximum

Mechanical Compatibility Criteria:

• Package Type: 14-pin DIP (0.300", 7.62mm pitch)
• Mounting: Through-hole configuration
• Pin count and pinout: Identical to LF347N

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications and J-FET amplifier topology, enabling one-to-one replacement without circuit modification.

Functional Alternatives: Parts with comparable performance characteristics but differing in specific parameters such as slew rate, input bias current, or supply voltage range. These require verification of application-specific requirements before deployment.

Parameter Comparison

Engineering Selection Recommendations

Preferred Direct Substitutes (Active Product Status):

The LF347BN/NOPB and LF347N/NOPB from Texas Instruments are recommended as primary substitutes. Both devices maintain active product status, ensuring long-term availability and supply chain stability. These parts are RoHS3 compliant and carry identical electrical specifications to the original LF347N, with the exception of fixed supply voltage limits (36V maximum versus the original 7V to 36V range). The Texas Instruments variants are packaged in 14-PDIP configuration with tube packaging and are suitable for direct socket replacement.

Secondary Substitutes (Obsolete Status with Enhanced Performance):

The STMicroelectronics LF347N and TL084IN devices offer improved electrical performance characteristics, including higher slew rate (16 V/µs versus 13 V/µs) and lower input bias current (20 pA versus 50 pA). However, both are classified as obsolete. The TL084IN variant qualifies for automotive applications under AEC-Q100 and extends the operating temperature range to −40°C to 125°C, making it suitable for industrial and automotive environments where the original 0°C to 70°C range is insufficient.

Limited Compatibility Alternative:

The OP11EPZ from Analog Devices Inc. is an active product with general-purpose amplifier topology. This device exhibits significantly different electrical characteristics, including substantially lower slew rate (1 V/µs) and higher input bias current (180 nA). The OP11EPZ is not recommended as a direct substitute for the LF347N except in applications where the reduced performance parameters are acceptable and the lower input bias current requirement is not critical.

Frequently Asked Questions (FAQ)

Q: Can the LF347BN/NOPB from Texas Instruments replace the onsemi LF347N directly?

A: Yes. The LF347BN/NOPB maintains identical electrical specifications for slew rate, gain bandwidth product, input bias current, and supply current. Both devices are housed in 14-pin DIP packages with identical pinouts. The primary difference is the fixed maximum supply voltage of 36V on the Texas Instruments variant, compared to the original 7V to 36V range. If your application operates within 36V maximum supply, direct replacement is supported.

Q: What is the difference between LF347N and LF347BN?

A: The LF347BN variant specifies a maximum supply voltage of 36V, whereas the LF347N permits operation up to 36V with a minimum of 7V. Both devices share identical slew rate (13 V/µs), gain bandwidth product (4 MHz), and input bias current (50 pA) specifications. The LF347BN exhibits lower input offset voltage (3 mV versus 5 mV). For applications requiring the full 7V to 36V range, the LF347N is the appropriate selection.

Q: Are the TL084 series devices compatible with LF347N applications?

A: The TL084IN and TL084CN are J-FET input operational amplifiers with four circuits in 14-pin DIP packages. Both devices feature higher slew rate (16 V/µs) and lower input bias current (20 pA) compared to the LF347N. The TL084IN supports extended operating temperature (−40°C to 125°C) and automotive qualification (AEC-Q100). These devices are suitable substitutes when improved performance parameters are beneficial. The TL084CN operates within the standard 0°C to 70°C range.

Q: Why is the OP11EPZ listed as a substitute if it has different electrical characteristics?

A: The OP11EPZ is included in the substitute list due to its identical 14-pin DIP package and through-hole mounting configuration. However, the OP11EPZ employs general-purpose amplifier topology rather than J-FET input architecture, resulting in substantially different electrical performance. The OP11EPZ exhibits lower slew rate (1 V/µs), higher input bias current (180 nA), and narrower supply voltage range (10V to 30V). This device is not recommended for direct replacement in applications requiring J-FET input characteristics.

Q: What is the significance of RoHS3 compliance on substitute parts?

A: RoHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting the use of lead and other hazardous materials in electronic components. The Texas Instruments LF347BN/NOPB and LF347N/NOPB variants are RoHS3 compliant, supporting environmental and regulatory requirements in modern manufacturing. The original onsemi LF347N does not specify RoHS status. If RoHS compliance is a design requirement, Texas Instruments variants are the appropriate selection.

Q: Can I use the STMicroelectronics LF347N as a substitute for the onsemi LF347N?

A: The STMicroelectronics LF347N is electrically compatible with improved performance characteristics. However, this device specifies a fixed supply voltage of 44V (both minimum and maximum), whereas the original onsemi LF347N operates across 7V to 36V. If your application requires operation below 44V or above 44V, the STMicroelectronics variant is not suitable. Additionally, the STMicroelectronics part is classified as obsolete, presenting potential supply chain constraints.

Q: What packaging differences exist between substitute parts?

A: All substitute parts listed maintain the 14-pin DIP (0.300", 7.62mm) package with through-hole mounting, ensuring mechanical compatibility. Packaging variations include tube versus reel configurations. The Texas Instruments variants (LF347BN/NOPB and LF347N/NOPB) are supplied in tube packaging, while other substitutes may be supplied in alternative formats. Verify packaging requirements with your procurement specification before finalizing part selection.