LF347N Equivalent & Substitute Parts

Part Overview

The LF347N is a J-FET input operational amplifier featuring four independent circuits in a 14-DIP package. Manufactured by STMicroelectronics, this device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The LF347N operates across a 0°C to 70°C temperature range with a 44V supply span and delivers 16V/µs slew rate performance suitable for precision signal conditioning applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
Slew Rate	16	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	20	pA
Voltage - Input Offset	3	mV
Current - Supply	1.4 (x4 Channels)	mA
Current - Output / Channel	40	mA
Voltage - Supply Span	44	V
Operating Temperature	0 to 70	°C
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Amplifier Type: J-FET input architecture
Number of Circuits: Four independent operational amplifiers
Package / Case: 14-DIP (0.300", 7.62mm) form factor
Mounting Type: Through Hole configuration
Operating Temperature Range: 0°C to 70°C minimum compatibility
Gain Bandwidth Product: 4 MHz nominal performance class

Secondary Compatibility Parameters:

Slew Rate: 13V/µs to 20V/µs range
Current - Input Bias: 10 pA to 50 pA range
Voltage - Input Offset: 300 µV to 5 mV range
Current - Supply: 1.4 mA to 10 mA per channel
Current - Output / Channel: 14 mA to 40 mA range
Voltage - Supply Span: Minimum 36V to 44V

Substitute parts are grouped into two categories: Direct J-FET Equivalents (matching amplifier type and performance class) and General Purpose Alternatives (different amplifier topology with compatible pinout and package).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Span (V)	Product Status	RoHS Status
LF347N	STMicroelectronics	J-FET	16	4	20	3	1.4	40	44	Obsolete	ROHS3
AD713JNZ	Analog Devices Inc.	J-FET	20	4	10	0.3	10	25	36	Active	ROHS3
LF347BN/NOPB	Texas Instruments	J-FET	13	4	50	3	7.2	—	36	Active	ROHS3
LF347N/NOPB	Texas Instruments	J-FET	13	4	50	5	7.2	—	36	Active	ROHS3
LF347BN	onsemi	J-FET	13	4	50	3	7.2	—	36	Obsolete	Non-compliant
LF444CN/NOPB	Texas Instruments	J-FET	1	1	10	3	0.6	14	36	Active	ROHS3
AD704JNZ	Analog Devices Inc.	General Purpose	0.1	0.8	100	0.05	1.5	15	36	Active	ROHS3
LM248N	STMicroelectronics	General Purpose	0.5	1.3	30	1	2.1	25	44	Obsolete	ROHS3
LM348N	STMicroelectronics	General Purpose	0.5	1	30	1	2.1	25	44	Obsolete	ROHS3
NJM2060D#	Nisshinbo Micro Devices Inc.	General Purpose	4	10	40	0.5	9	—	36	Active	RoHS Compliant

Engineering Selection Recommendations

Direct J-FET Equivalents (Recommended Primary Substitutes):

The AD713JNZ (Analog Devices Inc.) represents the optimal active substitute for the LF347N. This device maintains J-FET input architecture with 4 MHz gain bandwidth product, operates within the 0°C to 70°C temperature range, and is ROHS3 compliant. The AD713JNZ delivers superior slew rate performance (20V/µs versus 16V/µs) and lower input bias current (10 pA versus 20 pA), providing enhanced precision characteristics. Supply voltage compatibility spans 9V to 36V, accommodating the LF347N's 44V nominal requirement within acceptable operating margins.

The LF347BN/NOPB (Texas Instruments) and LF347N/NOPB (Texas Instruments) provide pin-compatible alternatives with active product status and ROHS3 compliance. These devices maintain the 4 MHz gain bandwidth product and J-FET input topology. The LF347BN/NOPB operates at 36V supply span with 13V/µs slew rate, representing a conservative performance trade-off with lower supply current consumption (7.2 mA versus 1.4 mA per channel).

The LF444CN/NOPB (Texas Instruments) is a J-FET alternative suitable for applications where reduced power consumption and lower slew rate requirements are acceptable. This device operates at 1V/µs slew rate and 1 MHz gain bandwidth product with minimal supply current (600 µA per channel), appropriate for low-power signal conditioning circuits.

General Purpose Alternatives (Secondary Substitutes):

The LM248N and LM348N (STMicroelectronics) provide general purpose amplifier topology with 44V supply span matching the LF347N's voltage capability. These obsolete devices maintain ROHS3 compliance and through-hole 14-DIP packaging. The LM348N operates at 1 MHz gain bandwidth product with 0.5V/µs slew rate, suitable for applications where J-FET input characteristics are not critical.

The NJM2060D# (Nisshinbo Micro Devices Inc.) is an active general purpose alternative with 10 MHz gain bandwidth product and 4V/µs slew rate, offering enhanced bandwidth performance. This device operates across 8V to 36V supply range with RoHS compliance.

Compliance and Availability Considerations:

All recommended active substitutes maintain ROHS3 compliance and through-hole mounting compatibility. The AD713JNZ demonstrates the highest inventory availability (2463 units) among active J-FET equivalents. The LF347BN/NOPB and LF347N/NOPB (Texas Instruments) provide established supply chains with 2086 and 1315 units respectively. The LF347BN (onsemi) is obsolete and RoHS non-compliant, limiting suitability for new designs.

Frequently Asked Questions (FAQ)

Q: Can the AD713JNZ directly replace the LF347N in existing circuit designs?

A: The AD713JNZ maintains J-FET input architecture, four-circuit configuration, and 14-DIP package compatibility with the LF347N. Pin assignments are identical. The AD713JNZ operates within the 0°C to 70°C temperature range and provides superior slew rate performance (20V/µs). Supply voltage compatibility spans 9V to 36V, which accommodates the LF347N's 44V nominal specification. Circuit validation is required to confirm performance within specific application bandwidth and offset voltage requirements.

Q: What is the primary difference between J-FET and General Purpose amplifier substitutes?

A: J-FET input amplifiers feature extremely low input bias current (10 to 50 pA range) and high input impedance, suitable for precision signal conditioning and high-impedance source applications. General Purpose amplifiers exhibit higher input bias current (30 to 100 nA range) but may offer different bandwidth and slew rate characteristics. Selection depends on application requirements for input impedance and bias current performance.

Q: Are the Texas Instruments LF347BN/NOPB and LF347N/NOPB interchangeable with the STMicroelectronics LF347N?

A: Both Texas Instruments variants maintain identical pin configuration and J-FET input topology. The LF347BN/NOPB and LF347N/NOPB operate at 36V supply span versus the STMicroelectronics LF347N at 44V. Both are ROHS3 compliant and active products. Slew rate is reduced to 13V/µs, and supply current increases to 7.2 mA per channel. These devices are suitable for applications where the reduced supply voltage and increased power consumption are acceptable.

Q: Why is the LF347BN (onsemi) not recommended as a substitute?

A: The onsemi LF347BN is classified as obsolete with RoHS non-compliance status. While it maintains J-FET input architecture and 4 MHz gain bandwidth product, the non-compliant RoHS status restricts use in new designs subject to environmental regulations. Active alternatives with ROHS3 compliance are available.

Q: What packaging considerations apply to LF347N substitutes?

A: All listed substitute parts maintain through-hole 14-DIP (0.300", 7.62mm) package configuration, ensuring mechanical and electrical compatibility with existing printed circuit board layouts. No package conversion or adapter circuitry is required for direct substitution.

Q: Can the LF444CN/NOPB replace the LF347N in high-frequency applications?

A: The LF444CN/NOPB is a J-FET input device with identical 14-DIP package and pin configuration. However, it operates at 1 MHz gain bandwidth product and 1V/µs slew rate, representing significant performance reduction compared to the LF347N's 4 MHz and 16V/µs specifications. The LF444CN/NOPB is suitable only for applications where reduced bandwidth and slew rate requirements are acceptable, such as low-frequency signal conditioning or power-constrained designs.

Q: What supply voltage considerations apply when substituting the LF347N?

A: The LF347N operates at 44V supply span. Most active J-FET substitutes (AD713JNZ, LF347BN/NOPB, LF347N/NOPB) operate at 36V maximum supply voltage. Circuit designs must verify that 36V operation is acceptable. The LM248N and LM348N general purpose alternatives maintain 44V supply span compatibility. The NJM2060D# operates at 36V maximum. Supply voltage derating may be required for applications designed for the full 44V capability.

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