LF353M Equivalent & Substitute Parts

Part Overview

The LF353M is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a dual-channel (2 circuit) device in 8-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production status. The LF353M operates across a wide supply voltage range (10V to 36V) with low input bias current (50 pA) and moderate slew rate (13V/µs), making it suitable for precision analog signal conditioning applications requiring low input offset voltage (5 mV) and low power consumption (3.6 mA per channel pair).

Due to Last Time Buy status, identification of functionally equivalent alternatives is necessary for design continuity and long-term component availability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Slew Rate	13	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	50	pA
Voltage - Input Offset	5	mV
Current - Supply (x2 Channels)	3.6	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LF353M is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input architecture
Number of Circuits: Dual-channel (2 circuit) configuration
Package / Case: 8-SOIC form factor with identical 0.154" (3.90mm) width
Mounting Type: Surface mount compatibility
Operating Temperature Range: 0°C to 70°C minimum coverage
Supply Voltage Range: Minimum 10V to maximum 36V overlap

Secondary Compatibility Parameters:

Slew Rate: 13V/µs or greater
Gain Bandwidth Product: 4 MHz or greater
Input Bias Current: 50 pA or lower
Input Offset Voltage: 5 mV or lower
Supply Current: 3.6 mA per channel pair or lower

Substitute parts are grouped into two categories based on performance tier:

Category A - Direct Equivalents (Texas Instruments LF353 Series): LF353M/NOPB and LF353MX/NOPB maintain identical electrical specifications to the main part number, differing only in packaging format (Tube vs. Cut Tape & Digi-Reel). These parts satisfy all primary and secondary criteria without performance trade-offs.

Category B - Enhanced Performance Alternatives (Analog Devices AD648 and AD712 Series): AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, and AD648KRZ provide superior input bias current (3–5 pA) and lower input offset voltage (300–750 µV) compared to the LF353M, with trade-offs in slew rate (1.8V/µs) and gain bandwidth product (1 MHz). These parts are suitable for applications prioritizing ultra-low input current over high-speed performance.

AD712JRZ, AD712JRZ-REEL, AD712JRZ-REEL7, and AD712KRZ exceed LF353M performance across slew rate (20V/µs) and gain bandwidth product (4 MHz equivalent), with improved input bias current (25 pA) and output current capability (25 mA per channel). These parts are suitable for applications requiring higher speed and output drive capability.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV/µV)	Supply Current (mA/µA)	Supply Range (V)	Package	Product Status
LF353M	Texas Instruments	13	4	50	5 mV	3.6 mA	10–36	8-SOIC	Last Time Buy
LF353M/NOPB	Texas Instruments	13	4	50	5 mV	3.6 mA	10–36	8-SOIC	Active
LF353MX/NOPB	Texas Instruments	13	4	50	5 mV	3.6 mA	10–36	8-SOIC	Active
AD648JRZ	Analog Devices Inc.	1.8	1	5	750 µV	340 µA	9–36	8-SOIC	Active
AD648JRZ-REEL	Analog Devices Inc.	1.8	1	5	750 µV	340 µA	9–36	8-SOIC	Active
AD648JRZ-REEL7	Analog Devices Inc.	1.8	1	5	750 µV	340 µA	9–36	8-SOIC	Active
AD648KRZ	Analog Devices Inc.	1.8	1	3	300 µV	340 µA	9–36	8-SOIC	Active
AD712JRZ	Analog Devices Inc.	20	4	25	300 µV	5 mA	9–36	8-SOIC	Active
AD712JRZ-REEL	Analog Devices Inc.	20	4	25	300 µV	5 mA	9–36	8-SOIC	Active
AD712JRZ-REEL7	Analog Devices Inc.	20	4	25	300 µV	5 mA	9–36	8-SOIC	Active
AD712KRZ	Analog Devices Inc.	20	4	25	300 µV	5 mA	9–36	8-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement (No Design Modification Required):

Select LF353M/NOPB or LF353MX/NOPB when component availability is the primary concern. Both parts maintain identical electrical and mechanical specifications to the main part number LF353M. LF353MX/NOPB offers higher inventory availability (17,700 units) compared to LF353M/NOPB (1,432 units) and is supplied in Cut Tape & Digi-Reel format, suitable for automated assembly processes. Both parts carry Active product status and ROHS3 compliance, ensuring long-term supply continuity.

For Low-Power Applications (Reduced Supply Current):

Select AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, or AD648KRZ when supply current reduction is a design objective. These parts consume 340 µA per channel pair compared to 3.6 mA for the LF353M, representing a 90% reduction in quiescent current. The AD648KRZ variant provides the lowest input bias current (3 pA) and input offset voltage (300 µV) within this group. Trade-offs include reduced slew rate (1.8V/µs vs. 13V/µs) and lower gain bandwidth product (1 MHz vs. 4 MHz). These parts are suitable for battery-powered or energy-constrained applications where signal bandwidth requirements do not exceed 1 MHz.

For High-Speed Applications (Enhanced Performance):

Select AD712JRZ, AD712JRZ-REEL, AD712JRZ-REEL7, or AD712KRZ when slew rate and output current capability are critical. These parts deliver 20V/µs slew rate (1.54× improvement) and 25 mA output current per channel (compared to unspecified output current for LF353M). Gain bandwidth product matches the LF353M at 4 MHz. Input bias current is improved to 25 pA, and input offset voltage is reduced to 300 µV. Supply current increases to 5 mA per channel pair. AD712JRZ-REEL7 offers the highest inventory availability (38,531 units) within this group.

All substitute parts maintain 8-SOIC package compatibility, ROHS3 compliance, MSL Level 1 rating, and operating temperature range 0°C to 70°C. All parts are Active product status, ensuring sustained availability.

Frequently Asked Questions (FAQ)

Q1: Can LF353M/NOPB be used as a direct replacement for LF353M?

A: Yes. LF353M/NOPB is electrically and mechanically identical to LF353M. The difference is packaging format: LF353M/NOPB is supplied in Tube packaging, while LF353M uses standard packaging. Both parts meet identical electrical specifications and are suitable for direct substitution without circuit modification.

Q2: What is the difference between LF353MX/NOPB and LF353M/NOPB?

A: Both parts are electrically identical. The difference is packaging and supply format: LF353MX/NOPB is supplied in Cut Tape & Digi-Reel format with higher inventory availability (17,700 units vs. 1,432 units). LF353MX/NOPB is preferred for high-volume production requiring automated tape-and-reel feeding.

Q3: Can AD648 series parts replace LF353M in all applications?

A: AD648 series parts are not universal replacements. While they maintain J-FET input architecture, 8-SOIC packaging, and dual-channel configuration, they have significantly lower slew rate (1.8V/µs vs. 13V/µs) and gain bandwidth product (1 MHz vs. 4 MHz). AD648 parts are suitable only for applications with bandwidth requirements below 1 MHz and where ultra-low input bias current (3–5 pA) is required. Applications requiring the full 4 MHz bandwidth of LF353M will not function correctly with AD648 parts.

Q4: Can AD712 series parts replace LF353M in all applications?

A: AD712 series parts are suitable replacements for LF353M in most applications. They maintain identical gain bandwidth product (4 MHz) and improve slew rate (20V/µs vs. 13V/µs), input bias current (25 pA vs. 50 pA), and output current capability (25 mA vs. unspecified). The primary trade-off is increased supply current (5 mA vs. 3.6 mA per channel pair). AD712 parts are recommended for applications requiring higher speed performance or greater output drive capability.

Q5: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (LF353M/NOPB, LF353MX/NOPB, AD648 series, and AD712 series) carry ROHS3 compliance certification. All parts also maintain MSL Level 1 (Unlimited) moisture sensitivity rating and are suitable for standard PCB assembly processes.

Q6: What is the minimum supply voltage for each substitute part?

A: LF353M, LF353M/NOPB, and LF353MX/NOPB require minimum 10V supply. AD648 and AD712 series parts require minimum 9V supply. Designs operating at 9V supply voltage cannot use LF353M variants but can use AD648 or AD712 alternatives.

Q7: Which substitute part offers the best inventory availability?

A: AD712JRZ-REEL7 offers the highest inventory availability at 38,531 units in stock. LF353MX/NOPB is the second-highest at 17,700 units. For immediate availability of direct LF353M equivalents, LF353MX/NOPB is recommended.

Q8: Can I use AD648 and AD712 parts interchangeably?

A: No. AD648 and AD712 parts have different electrical characteristics and are not interchangeable. AD648 is optimized for ultra-low input current and low power consumption but has limited bandwidth (1 MHz). AD712 is optimized for high-speed performance (20V/µs slew rate, 4 MHz bandwidth) with moderate input current (25 pA). Selection depends on application bandwidth and power consumption requirements.

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