LF347DRG4 Equivalent & Substitute Parts

Part Overview

The LF347DRG4 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, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement continuity. The LF347DRG4 operates across a supply voltage range of 7V to 36V with a gain bandwidth product of 3 MHz and slew rate of 13V/µs, making it suitable for precision analog signal processing applications requiring low input bias current and low input offset voltage characteristics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
Slew Rate	13	V/µs
Gain Bandwidth Product	3	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	5	mV
Current - Supply (x4 Channels)	8	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	7	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LF347DRG4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: Four independent operational amplifiers
Package Type: 14-SOIC surface mount form factor
Voltage Supply Range: Minimum 7V to maximum 36V compatibility
Operating Temperature Range: Minimum 0°C to maximum 70°C
Slew Rate: 13V/µs or greater
Gain Bandwidth Product: 3 MHz or greater
Input Bias Current: 50 pA or lower
Input Offset Voltage: 5 mV or lower
Output Current per Channel: 40 mA or greater
Supply Current: 8 mA (x4 channels) or lower

Substitute parts are grouped into two categories based on parameter compatibility:

Category A - Direct Equivalents (Identical Electrical Specifications): Parts that maintain all key electrical parameters within the specified ranges of the LF347DRG4, differing only in product status (active vs. obsolete) or packaging format (reel vs. tube).

Category B - Enhanced Substitutes (Superior Electrical Performance): Parts that exceed the LF347DRG4 specifications in one or more parameters (higher slew rate, lower input bias current, lower input offset voltage, lower supply current, or extended temperature range) while maintaining full backward compatibility within the 14-SOIC package footprint.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Package
LF347DRG4	Texas Instruments	Obsolete	13	3	50	5	8	40	0 to 70	14-SOIC
LF347DR	Texas Instruments	Active	13	3	50	5	8	40	0 to 70	14-SOIC
LF347M/NOPB	Texas Instruments	Active	13	4	50	5	7.2	—	0 to 70	14-SOIC
LF347MX/NOPB	Texas Instruments	Active	13	4	50	5	7.2	—	0 to 70	14-SOIC
ADTL084ARZ-REEL7	Analog Devices Inc.	Active	20	5	2	1.5	1.2	27	-40 to 125	14-SOIC
LF247DT	STMicroelectronics	Active	16	4	20	3	1.4	40	-40 to 105	14-SOIC
TL074IYDT	STMicroelectronics	Active	13	3	20	3	1.4	40	-40 to 105	14-SOIC
TL084ACDT	STMicroelectronics	Active	16	4	20	3	1.4	40	0 to 70	14-SOIC
TL084AIDT	STMicroelectronics	Active	16	4	20	3	1.4	40	-40 to 105	14-SOIC
TL084BCDT	STMicroelectronics	Active	16	4	20	1	1.4	40	0 to 70	14-SOIC
TL084BIDT	STMicroelectronics	Active	16	4	20	1	1.4	40	-40 to 105	14-SOIC

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

LF347DR is the direct active equivalent of the LF347DRG4. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and are packaged in 14-SOIC form factor. The LF347DR is available in Cut Tape and Digi-Reel packaging with 105,200 units in stock, providing immediate procurement availability. This part maintains full backward compatibility with existing designs and requires no circuit modifications.

Secondary Recommendation - Enhanced Performance (Texas Instruments):

LF347M/NOPB and LF347MX/NOPB offer improved performance characteristics including higher gain bandwidth product (4 MHz vs. 3 MHz) and reduced supply current (7.2 mA vs. 8 mA per four channels). Both parts maintain the same operating temperature range and are ROHS3 compliant. These variants are suitable for applications where lower power consumption is beneficial.

Alternative Recommendation - Extended Temperature Range:

TL074IYDT and TL084AIDT/TL084BIDT provide extended operating temperature ranges (-40°C to 105°C) compared to the LF347DRG4 (0°C to 70°C). These STMicroelectronics parts feature improved slew rate (16V/µs), higher gain bandwidth product (4 MHz), and lower input bias current (20 pA). TL084BIDT additionally offers reduced input offset voltage (1 mV vs. 5 mV). These parts are suitable for applications requiring wider temperature operation or enhanced precision.

Premium Alternative - Superior Performance Specifications:

ADTL084ARZ-REEL7 from Analog Devices Inc. delivers the highest performance specifications: slew rate of 20V/µs, gain bandwidth product of 5 MHz, input bias current of 2 pA, and input offset voltage of 1.5 mV. Extended operating temperature range (-40°C to 125°C) and reduced supply current (1.2 mA) make this part suitable for precision instrumentation and wide-temperature applications. All parts maintain ROHS3 compliance and are surface mount compatible in 14-SOIC packaging.

Frequently Asked Questions (FAQ)

Q1: Can LF347DR be used as a direct replacement for LF347DRG4 without circuit modifications?

A: Yes. LF347DR is the active equivalent of LF347DRG4 with identical electrical specifications. Both parts feature the same slew rate (13V/µs), gain bandwidth product (3 MHz), input bias current (50 pA), input offset voltage (5 mV), supply voltage range (7V to 36V), and operating temperature range (0°C to 70°C). The 14-SOIC package footprint is identical. No circuit modifications are required.

Q2: What is the primary difference between LF347DRG4 and LF347DR?

A: The primary difference is product status. LF347DRG4 is classified as obsolete, while LF347DR is active. LF347DR is available in higher quantities (105,200 units in stock) and in standard packaging formats (Cut Tape and Digi-Reel). Electrical specifications and package type are identical.

Q3: Are TL084 series parts compatible with LF347DRG4 designs?

A: TL084 series parts are compatible with LF347DRG4 in terms of package footprint (14-SOIC) and pin configuration. However, TL084 variants feature improved electrical specifications: higher slew rate (16V/µs vs. 13V/µs), higher gain bandwidth product (4 MHz vs. 3 MHz), and lower input bias current (20 pA vs. 50 pA). These enhancements are backward compatible and do not require circuit modifications. Temperature range varies by variant.

Q4: What is the advantage of ADTL084ARZ-REEL7 over LF347DRG4?

A: ADTL084ARZ-REEL7 offers superior performance across multiple parameters: 54% higher slew rate (20V/µs vs. 13V/µs), 67% higher gain bandwidth product (5 MHz vs. 3 MHz), 96% lower input bias current (2 pA vs. 50 pA), 70% lower input offset voltage (1.5 mV vs. 5 mV), and 85% lower supply current (1.2 mA vs. 8 mA). Extended operating temperature range (-40°C to 125°C) provides wider application flexibility. These improvements are fully backward compatible.

Q5: Can I use parts with extended temperature ranges (-40°C to 105°C) in applications designed for 0°C to 70°C operation?

A: Yes. Extended temperature range parts are fully backward compatible with designs specified for narrower temperature ranges. A part rated for -40°C to 105°C operation will function correctly across the 0°C to 70°C range. This substitution introduces no risk and may provide additional design margin for thermal variations.

Q6: What packaging formats are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel for high-volume automated assembly, Tube packaging for manual assembly, and Tape & Reel (TR) for standard reel-based pick-and-place equipment. All formats maintain identical electrical specifications and 14-SOIC package dimensions. Selection depends on assembly process requirements.

Q7: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. Moisture sensitivity level is 1 (unlimited) for all parts, indicating no special moisture control requirements during storage or handling.

Q8: Which substitute part offers the best balance of performance and availability?

A: LF347DR provides the optimal balance. It is the direct active equivalent with identical specifications to LF347DRG4, manufactured by the same supplier (Texas Instruments), and available in the highest quantity (105,200 units). It requires no design changes and provides immediate procurement availability. For applications requiring enhanced performance, TL084ACDT offers improved specifications with 888,600 units in stock.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message