LF353D Equivalent & Substitute Parts

Part Overview

The LF353D is a J-FET input operational amplifier featuring dual circuits in an 8-SOIC surface mount package, manufactured by STMicroelectronics. This device is classified as obsolete, though 8,671 units remain in stock as new original inventory. The LF353D operates across a wide supply voltage range of 6V to 36V and is suitable for applications requiring low input bias current and moderate bandwidth performance. Due to its obsolete status, equivalent and substitute parts are necessary for new designs and long-term production planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	LF353D
Manufacturer	STMicroelectronics
Category	Linear, Amplifiers
Amplifier Type	J-FET
Number of Circuits	2
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	16V/µs
Gain Bandwidth Product	3 MHz
Current - Input Bias	20 pA
Voltage - Input Offset	3 mV
Current - Supply	1.4mA (x2 Channels)
Current - Output / Channel	40 mA
Voltage - Supply Span (Min)	6 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LF353D is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: Dual (2 circuits)
Package / Case: 8-SOIC form factor
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 6V, Maximum 36V
Operating Temperature Range: 0°C ~ 70°C minimum

Secondary Compatibility Parameters:

Slew Rate: 16V/µs or greater
Gain Bandwidth Product: 3 MHz or greater
Current - Input Bias: 20 pA or lower
Voltage - Input Offset: 3 mV or lower
Current - Output / Channel: 40 mA or greater

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (STMicroelectronics LF353 Series) Parts that maintain identical electrical specifications and packaging. The LF353DT represents an active product variant with enhanced gain bandwidth product (4 MHz) while maintaining all other critical parameters.

Category 2: Functional Alternatives (Analog Devices AD648 Series) Parts that satisfy primary substitution criteria but exhibit different electrical characteristics. The AD648 series provides J-FET input dual amplifiers in 8-SOIC packaging with lower input bias current (5 pA or 3 pA) and reduced input offset voltage, though with reduced slew rate (1.8V/µs) and gain bandwidth product (1 MHz).

Category 3: General Purpose Alternatives (Analog Devices AD706 Series) Parts that share mechanical compatibility and dual-circuit configuration but employ general purpose amplifier topology rather than J-FET input design. These devices offer extended operating temperature range and lower minimum supply voltage (4V) but differ significantly in input bias current and bandwidth characteristics.

Parameter Comparison

Parameter	LF353D	LF353DT	AD648JRZ	AD648JRZ-REEL	AD648JRZ-REEL7	AD648KRZ	AD706ARZ	AD706ARZ-REEL	AD706ARZ-REEL7	AD706JRZ	AD706JRZ-REEL
Manufacturer	STMicroelectronics	STMicroelectronics	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	2	2	2	2	2	2	2	2	2	2	2
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate	16V/µs	16V/µs	1.8V/µs	1.8V/µs	1.8V/µs	1.8V/µs	0.15V/µs	0.15V/µs	0.15V/µs	0.15V/µs	0.15V/µs
Gain Bandwidth Product	3 MHz	4 MHz	1 MHz	1 MHz	1 MHz	1 MHz	800 kHz	800 kHz	800 kHz	800 kHz	800 kHz
Current - Input Bias	20 pA	20 pA	5 pA	5 pA	5 pA	3 pA	50 pA	50 pA	50 pA	50 pA	50 pA
Voltage - Input Offset	3 mV	3 mV	750 µV	750 µV	750 µV	300 µV	30 µV	30 µV	30 µV	30 µV	30 µV
Current - Supply	1.4mA (x2 Channels)	1.4mA (x2 Channels)	340µA (x2 Channels)	340µA (x2 Channels)	340µA (x2 Channels)	340µA (x2 Channels)	750µA	750µA	750µA	750µA	750µA
Current - Output / Channel	40 mA	40 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA
Voltage - Supply Span (Min)	6 V	6 V	9 V	9 V	9 V	9 V	4 V	4 V	4 V	4 V	4 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The LF353DT is the recommended substitute for the obsolete LF353D. Both parts are manufactured by STMicroelectronics, share identical mechanical packaging (8-SOIC), and maintain the same J-FET input topology. The LF353DT is classified as an active product, ensuring long-term availability and supply chain continuity. The LF353DT exhibits a marginally higher gain bandwidth product (4 MHz versus 3 MHz) while maintaining all other critical electrical parameters within specification. All compliance certifications, including ROHS3 compliance and MSL rating, are identical between the two parts.

For J-FET Input Applications with Enhanced Performance:

The Analog Devices AD648 series (AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, AD648KRZ) provides J-FET input dual amplifiers in 8-SOIC packaging with active product status. These parts offer superior input bias current performance (5 pA or 3 pA versus 20 pA) and reduced input offset voltage (750 µV or 300 µV versus 3 mV). However, the AD648 series exhibits reduced slew rate (1.8V/µs versus 16V/µs) and lower gain bandwidth product (1 MHz versus 3 MHz). The AD648 series requires a minimum supply voltage of 9V, compared to 6V for the LF353D. Selection of the AD648 series is appropriate for applications prioritizing low input bias current over high-speed performance.

For General Purpose Applications with Extended Temperature Range:

The Analog Devices AD706 series (AD706ARZ, AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ, AD706JRZ-REEL) provides dual general purpose amplifiers in 8-SOIC packaging with active product status. These parts are not J-FET input devices and employ general purpose amplifier topology. The AD706 series offers extended operating temperature range (-40°C to 85°C for AD706ARZ variants, 0°C to 70°C for AD706JRZ variants) and lower minimum supply voltage (4V). However, the AD706 series exhibits significantly reduced slew rate (0.15V/µs), lower gain bandwidth product (800 kHz), and higher input bias current (50 pA). Selection of the AD706 series is appropriate only for applications where J-FET input characteristics are not required and where the reduced bandwidth is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the LF353DT be used as a direct replacement for the LF353D?

A: Yes. The LF353DT is a direct equivalent manufactured by STMicroelectronics with identical electrical specifications, mechanical packaging, and compliance certifications. The LF353DT is classified as an active product, providing superior long-term availability compared to the obsolete LF353D.

Q: What is the primary difference between the LF353D and the AD648 series?

A: Both are J-FET input dual amplifiers in 8-SOIC packaging. The LF353D provides higher slew rate (16V/µs versus 1.8V/µs) and higher gain bandwidth product (3 MHz versus 1 MHz). The AD648 series provides lower input bias current (5 pA or 3 pA versus 20 pA) and lower input offset voltage (750 µV or 300 µV versus 3 mV). The AD648 series requires a minimum supply voltage of 9V, while the LF353D operates at 6V minimum.

Q: Can the AD706 series replace the LF353D?

A: The AD706 series shares the 8-SOIC mechanical package and dual-circuit configuration but employs general purpose amplifier topology rather than J-FET input design. The AD706 series exhibits significantly different electrical characteristics, including lower slew rate (0.15V/µs), lower gain bandwidth product (800 kHz), and higher input bias current (50 pA). The AD706 series is suitable only for applications where J-FET input characteristics are not required.

Q: What packaging options are available for substitute parts?

A: The LF353DT is available in Cut Tape (CT) and Digi-Reel packaging. The AD648 series is available in Tube (AD648JRZ, AD648KRZ) and Cut Tape (CT) with Digi-Reel options (AD648JRZ-REEL, AD648JRZ-REEL7). The AD706 series is available in Tube (AD706ARZ, AD706JRZ) and Cut Tape (CT) with Digi-Reel options (AD706ARZ-REEL, AD706ARZ-REEL7, AD706JRZ-REEL).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the compliance profile of the LF353D.

Q: What is the minimum supply voltage requirement for each substitute?

A: The LF353D and LF353DT require a minimum supply voltage of 6V. The AD648 series requires a minimum supply voltage of 9V. The AD706 series requires a minimum supply voltage of 4V. Applications operating at 6V to 8V supply voltage cannot use the AD648 series.

Q: Which substitute part offers the best input bias current performance?

A: The AD648KRZ offers the lowest input bias current at 3 pA, compared to 20 pA for the LF353D and 5 pA for other AD648 variants. However, the AD648KRZ exhibits the same reduced slew rate and gain bandwidth product as other AD648 series parts.

Q: What is the inventory status of substitute parts?

A: The LF353DT has 6,520 units in stock. The AD648 series variants have between 1,434 and 7,928 units in stock. The AD706 series variants have between 2,874 and 22,970 units in stock. All substitute parts are classified as active products.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message