LF347BN/PB Equivalent & Substitute Parts

Part Overview

The LF347BN/PB is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in a 14-DIP package. This device is classified as obsolete, though 996 pieces remain in new original stock. The LF347BN/PB operates across a 36V supply span with a slew rate of 13V/µs and 4 MHz gain bandwidth product, making it suitable for precision analog signal processing applications requiring low input bias current and low input offset voltage.

Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and new production runs. Active alternatives with comparable or superior electrical characteristics are available from Texas Instruments and Analog Devices Inc.

Key Parameters

Parameter	LF347BN/PB Value	Unit	Substitution Relevance
Amplifier Type	J-FET	—	Critical
Number of Circuits	4	—	Critical
Slew Rate	13	V/µs	Critical
Gain Bandwidth Product	4	MHz	Critical
Current - Input Bias	50	pA	Critical
Voltage - Input Offset	3	mV	Critical
Current - Supply	7.2 (x4 Channels)	mA	Important
Voltage - Supply Span	36	V	Critical
Operating Temperature	0 to 70	°C	Important
Package / Case	14-DIP (0.300", 7.62mm)	—	Critical
Mounting Type	Through Hole	—	Critical
RoHS Status	ROHS3 Compliant	—	Important

Substitute Part Grouping Explanation

Substitution of the LF347BN/PB is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Amplifier Type: J-FET input architecture
Number of Circuits: 4 independent operational amplifiers per package
Package / Case: 14-DIP (0.300", 7.62mm) form factor
Mounting Type: Through Hole
Slew Rate: 13V/µs or greater
Gain Bandwidth Product: 4 MHz or greater
Current - Input Bias: 50 pA or lower
Voltage - Input Offset: 3 mV or lower
Voltage - Supply Span: Minimum 36V capability

Substitute Categories:

Category 1: Direct Equivalents (Same Base Product) Parts sharing the LF347 base product number with identical electrical specifications and active product status. These include packaging variants (NOPB vs. PB designations).

Category 2: J-FET Amplifiers with Enhanced Performance Parts with J-FET input architecture, 4-circuit configuration, and electrical parameters meeting or exceeding the LF347BN/PB specifications. These include AD713JNZ and LT1058 series devices, which offer improved slew rate, lower input bias current, or lower input offset voltage while maintaining 14-DIP packaging and through-hole mounting.

Category 3: General Purpose Amplifiers (Limited Substitution) Parts with general purpose amplifier architecture (LT1114 series) in 14-DIP packaging. These devices meet package and mounting requirements but have significantly different electrical characteristics (lower slew rate, lower gain bandwidth product, lower supply voltage minimum). Substitution in this category is restricted to applications where the reduced performance parameters are acceptable.

Parameter Comparison

Part Number	Manufacturer	Product Status	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV/µV)	Supply Span (V)	Package
LF347BN/PB	Texas Instruments	Obsolete	J-FET	13	4	50	3 mV	36	14-DIP
LF347BN/NOPB	Texas Instruments	Active	J-FET	13	4	50	3 mV	36	14-DIP
LF347N/NOPB	Texas Instruments	Active	J-FET	13	4	50	5 mV	36	14-DIP
AD713JNZ	Analog Devices Inc.	Active	J-FET	20	4	10	300 µV	9–36	14-DIP
LT1058ACN#PBF	Analog Devices Inc.	Active	J-FET	14	5	5	180 µV	20–36	14-DIP
LT1058CN#PBF	Analog Devices Inc.	Active	J-FET	13	5	7	250 µV	20–36	14-DIP
LT1114ACN#PBF	Analog Devices Inc.	Active	General Purpose	0.3	0.75	70	20 µV	2–40	14-DIP
LT1114CN#PBF	Analog Devices Inc.	Active	General Purpose	0.3	0.75	70	20 µV	2–40	14-DIP
LT1114IN	Analog Devices Inc.	Active	General Purpose	0.3	0.75	70	20 µV	2–40	14-DIP
LT1114IN#PBF	Analog Devices Inc.	Active	General Purpose	0.3	0.75	70	20 µV	2–40	14-DIP
LT1125ACN#PBF	Analog Devices Inc.	Active	General Purpose	4.5	12.5	8000	25 µV	8–44	14-DIP

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

LF347BN/NOPB is the recommended primary substitute. This part maintains identical electrical specifications to the LF347BN/PB while offering active product status and higher inventory availability (2086 pieces). The only difference is packaging designation (NOPB vs. PB), which reflects lead-free RoHS compliance packaging. Both parts are ROHS3 compliant and carry identical REACH and ECCN classifications.

LF347N/NOPB is an alternative direct equivalent with active status and 1315 pieces in stock. Input offset voltage specification is 5 mV versus 3 mV for the LF347BN/PB, representing a minor relaxation of this parameter. This part is suitable for applications where the 5 mV offset specification is acceptable.

Secondary Substitutes (J-FET Amplifiers with Enhanced Performance):

AD713JNZ (Analog Devices Inc.) offers superior electrical performance with 20V/µs slew rate, 10 pA input bias current, and 300 µV input offset voltage. The supply span minimum is reduced to 9V, which may be advantageous in low-voltage applications. This part is active with 2463 pieces in stock and maintains 14-DIP through-hole packaging.

LT1058ACN#PBF and LT1058CN#PBF (Analog Devices Inc., LT® series) provide enhanced performance with 5 MHz gain bandwidth product, significantly lower input bias current (5–7 pA), and lower input offset voltage (180–250 µV). Supply span minimum is 20V. Both parts are active with high inventory (2350 and 2588 pieces respectively). These parts are suitable for precision applications requiring lower noise and offset characteristics.

Tertiary Substitutes (General Purpose Amplifiers):

LT1114 series devices (LT1114ACN#PBF, LT1114CN#PBF, LT1114IN, LT1114IN#PBF) and LT1125ACN#PBF are general purpose amplifiers in 14-DIP packaging. These parts do not meet the J-FET input bias current specification and have significantly lower slew rate and gain bandwidth product. Substitution is restricted to applications where reduced performance parameters are acceptable and where the extended supply voltage range (2–40V for LT1114, 8–44V for LT1125) provides system-level advantages.

Compliance and Certification:

All substitute parts listed are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and are REACH unaffected. All parts share ECCN EAR99 and HTSUS 8542.33.0001 classifications with the original LF347BN/PB.

Frequently Asked Questions (FAQ)

Q: Can LF347BN/NOPB be used as a direct replacement for LF347BN/PB?

A: Yes. LF347BN/NOPB is a direct equivalent with identical electrical specifications. The NOPB designation indicates lead-free RoHS-compliant packaging, while PB indicates lead-containing packaging. Both parts are ROHS3 compliant and electrically interchangeable. LF347BN/NOPB is preferred due to active product status and higher inventory availability.

Q: What is the difference between LF347BN/NOPB and LF347N/NOPB?

A: The primary difference is input offset voltage specification: LF347BN/NOPB specifies 3 mV maximum, while LF347N/NOPB specifies 5 mV maximum. All other electrical parameters are identical. LF347N/NOPB is suitable for applications where the relaxed offset specification is acceptable.

Q: Can AD713JNZ replace LF347BN/PB in all applications?

A: AD713JNZ is electrically compatible with superior performance characteristics (higher slew rate, lower input bias current, lower input offset voltage). However, the minimum supply voltage is 9V versus 36V for the LF347BN/PB. Verify that your application's supply voltage requirements are met. AD713JNZ is suitable for applications requiring enhanced performance within the 9–36V supply range.

Q: Are LT1058 series devices suitable replacements?

A: LT1058ACN#PBF and LT1058CN#PBF are J-FET amplifiers with enhanced performance (5 MHz gain bandwidth product, lower input bias current, lower input offset voltage). The minimum supply voltage is 20V. These parts are suitable for precision applications where the 20V minimum supply voltage is acceptable and where improved offset and bias current specifications provide system-level benefits.

Q: Can LT1114 series devices replace LF347BN/PB?

A: LT1114 series devices are general purpose amplifiers with significantly different electrical characteristics. Slew rate is 0.3V/µs (versus 13V/µs), gain bandwidth product is 750 kHz (versus 4 MHz), and input bias current is 70 pA (versus 50 pA). These parts are suitable only for applications where reduced performance parameters are acceptable. Verify that your circuit design does not depend on the higher slew rate or gain bandwidth product of the LF347BN/PB.

Q: What is the significance of the packaging designation (NOPB vs. PB)?

A: NOPB indicates lead-free, RoHS-compliant packaging suitable for lead-free soldering processes. PB indicates lead-containing packaging. Both designations are ROHS3 compliant. Selection depends on your manufacturing process requirements. NOPB is standard for modern production environments.

Q: Are all substitute parts available in 14-DIP through-hole packaging?

A: Yes. All substitute parts listed in this document are available in 14-DIP (0.300", 7.62mm) through-hole packaging. This ensures mechanical and electrical compatibility with existing PCB designs.

Q: What inventory status should I consider when selecting a substitute?

A: All substitute parts listed have active product status with current inventory availability. LF347BN/NOPB offers the highest inventory (2086 pieces), followed by LT1058CN#PBF (2588 pieces) and AD713JNZ (2463 pieces). For long-term supply chain planning, active product status is preferable to obsolete status.

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