LF347M Equivalent & Substitute Parts

Part Overview

The LF347M is a J-FET operational amplifier integrated circuit containing four independent amplifier circuits in a 14-SOIC surface mount package, manufactured by onsemi. This device is classified as obsolete product status. The LF347M operates across a supply voltage range of 7 V to 36 V with a slew rate of 13 V/µs and gain bandwidth product of 4 MHz. Due to its obsolete classification, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Amplifier Type	J-FET
Number of Circuits	4
Slew Rate	13 V/µs
Gain Bandwidth Product	4 MHz
Current - Input Bias	50 pA
Voltage - Input Offset	5 mV
Current - Supply	7.2 mA (x4 Channels)
Voltage - Supply Span (Min)	7 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LF347M is determined by the following critical parameters: J-FET amplifier type, four independent circuits, 14-SOIC package form factor, surface mount mounting type, and compatible supply voltage range. Substitute parts must maintain electrical compatibility within the specified operating conditions while meeting or exceeding the performance characteristics of the original device.

The substitute parts are grouped into two categories:

Direct Equivalents: Parts sharing identical base product numbers (LF347) with the same package footprint and electrical characteristics suitable for direct replacement.

Similar Alternatives: Parts with comparable J-FET amplifier architecture, four-circuit configuration, and 14-SOIC packaging that provide equivalent or enhanced performance specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	Input Bias Current (pA)	Input Offset Voltage (mV)	Supply Current (mA x4)	Supply Voltage Min (V)	Supply Voltage Max (V)	Operating Temp (°C)	Package
LF347M	onsemi	Obsolete	13	4	50	5	7.2	7	36	0 ~ 70	14-SOIC
LF347D	STMicroelectronics	Active	16	3	20	3	1.4	44	44	0 ~ 70	14-SOIC
ADTL084ARZ-REEL7	Analog Devices Inc.	Active	20	5	2	1.5	1.2	8	36	-40 ~ 125	14-SOIC
LF247DT	STMicroelectronics	Active	16	4	20	3	1.4	44	44	-40 ~ 105	14-SOIC
LF347BD	Texas Instruments	Obsolete	13	3	50	3	8	7	36	0 ~ 70	14-SOIC
LF347BDR	Texas Instruments	Active	13	3	50	3	8	7	36	0 ~ 70	14-SOIC
LF347DR	Texas Instruments	Active	13	3	50	5	8	7	36	0 ~ 70	14-SOIC
LF347DT	STMicroelectronics	Active	16	4	20	3	1.4	44	44	0 ~ 70	14-SOIC
LF347M/NOPB	Texas Instruments	Active	13	4	50	5	7.2	10	36	0 ~ 70	14-SOIC
LF347MX/NOPB	Texas Instruments	Active	13	4	50	5	7.2	10	36	0 ~ 70	14-SOIC

Engineering Selection Recommendations

Primary Recommendation: LF347M/NOPB (Texas Instruments) and LF347MX/NOPB (Texas Instruments) are the closest functional equivalents to the LF347M. Both parts maintain identical electrical specifications including 13 V/µs slew rate, 4 MHz gain bandwidth product, 50 pA input bias current, and 5 mV input offset voltage. These parts are in active product status with RoHS3 compliance and provide direct functional replacement with the same 14-SOIC package footprint.

Secondary Recommendation: LF347DR (Texas Instruments) provides active product status with matching electrical characteristics and identical package form factor. This part is available in high inventory quantities and maintains compatibility with the original LF347M specifications.

Alternative Consideration: LF347DT (STMicroelectronics) offers active product status with enhanced slew rate (16 V/µs) and matching gain bandwidth product (4 MHz). This part provides improved performance characteristics while maintaining the 14-SOIC package and four-circuit configuration.

Enhanced Performance Option: ADTL084ARZ-REEL7 (Analog Devices Inc.) provides superior performance specifications including 20 V/µs slew rate, 5 MHz gain bandwidth product, and 2 pA input bias current. This part extends the operating temperature range to -40°C ~ 125°C and maintains RoHS3 compliance. The supply voltage range (8 V to 36 V) is compatible with the original LF347M specifications.

All recommended substitute parts are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8542.33.0001, matching the regulatory classification of the original device.

Frequently Asked Questions (FAQ)

Q: Can the LF347M be directly replaced with LF347M/NOPB?

A: Yes. The LF347M/NOPB maintains identical electrical specifications including slew rate, gain bandwidth product, input bias current, input offset voltage, and supply current. Both parts use the 14-SOIC package with identical pin configuration and footprint. The LF347M/NOPB is in active product status, making it suitable for direct replacement in new designs and production.

Q: What is the difference between LF347DR and LF347DT?

A: Both parts are manufactured by Texas Instruments and STMicroelectronics respectively, with identical base product number LF347. The primary difference is packaging: LF347DR is supplied in Cut Tape (CT) & Digi-Reel format, while LF347DT is supplied in Tape & Reel (TR) format. Electrical specifications are identical, with both parts offering 13 V/µs slew rate and 3 MHz gain bandwidth product.

Q: Is the ADTL084ARZ-REEL7 compatible with the LF347M?

A: The ADTL084ARZ-REEL7 is functionally compatible with the LF347M. Both parts are four-circuit J-FET operational amplifiers in 14-SOIC packages. The ADTL084ARZ-REEL7 provides enhanced performance with 20 V/µs slew rate and 5 MHz gain bandwidth product compared to the LF347M's 13 V/µs and 4 MHz specifications. The supply voltage range (8 V to 36 V) overlaps with the LF347M (7 V to 36 V), and the extended operating temperature range (-40°C ~ 125°C) provides additional capability.

Q: Why do some substitute parts show different supply voltage specifications?

A: Supply voltage specifications vary by manufacturer design. The LF347M operates from 7 V to 36 V. The LF347D and LF347DT (STMicroelectronics) specify 44 V minimum and maximum, indicating a fixed supply voltage design. The ADTL084ARZ-REEL7 specifies 8 V to 36 V. When selecting a substitute, verify that the application supply voltage falls within the substitute part's specified range.

Q: What is the significance of the 14-SOIC package specification?

A: The 14-SOIC (Small Outline Integrated Circuit) package with 0.154" width and 3.90mm width is the physical form factor for all listed parts. This standardized package ensures mechanical compatibility with existing printed circuit board layouts and socket designs. All substitute parts maintain this identical package specification, enabling direct board-level replacement without layout modifications.

Q: Are all substitute parts RoHS3 compliant?

A: All active product status substitute parts listed are RoHS3 compliant. The LF347BD is classified as obsolete but carries RoHS3 compliance. The original LF347M (onsemi) does not specify RoHS status in the provided data. When transitioning from the obsolete LF347M to active alternatives, RoHS3 compliance is maintained across all recommended substitutes.

Q: What packaging options are available for the LF347 base product?

A: The LF347 base product is available in multiple packaging formats: Tube (LF347D, LF347M/NOPB), Cut Tape (CT) & Digi-Reel (ADTL084ARZ-REEL7, LF347DR, LF347DT, LF347MX/NOPB), and Tape & Reel (TR) (LF247DT, LF347BDR). Selection of packaging format depends on production volume requirements and inventory management practices.

Q: Can the LF247DT be used as a substitute for the LF347M?

A: The LF247DT is functionally compatible with the LF347M as a four-circuit J-FET operational amplifier in 14-SOIC package. However, the LF247DT has a different base product number (LF247 versus LF347), indicating a distinct product line. The LF247DT offers extended operating temperature range (-40°C ~ 105°C) compared to the LF347M (0°C ~ 70°C). Electrical specifications are similar with 16 V/µs slew rate and 4 MHz gain bandwidth product. Use of the LF247DT requires design verification to confirm compatibility with the original LF347M application.

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