LF353MX Equivalent & Substitute Parts

Part Overview

The LF353MX is a J-FET input operational amplifier featuring dual circuits in an 8-SOIC surface mount package, manufactured by Texas Instruments. This device is classified as "Not For New Designs," indicating it has been superseded in the product lifecycle. The LF353MX operates across a wide supply voltage range of 10V to 36V with a slew rate of 13V/µs and gain bandwidth product of 4 MHz, making it suitable for applications requiring low input bias current and low input offset voltage characteristics.

Finding equivalent and substitute parts is necessary due to the product's discontinued status for new designs, potential long-term availability constraints, and the need for designs to transition to active, supported alternatives that maintain functional compatibility.

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	3.6 (x2 Channels)	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	RoHS non-compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LF353MX is determined by strict adherence to the following critical parameters:

Primary Compatibility Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: Dual (2 circuits)
Package / Case: 8-SOIC form factor
Mounting Type: Surface Mount
Operating Temperature Range: 0°C to 70°C minimum
Supply Voltage Range: Minimum 10V to maximum 36V

Secondary Performance Parameters:

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

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

Category 1 - Direct Functional Equivalents: Parts meeting or exceeding all primary and secondary parameters while maintaining identical electrical performance specifications.

Category 2 - Enhanced Performance Substitutes: Parts exceeding primary compatibility criteria with improved performance characteristics in slew rate, bandwidth, or supply current, suitable for applications where enhanced performance is beneficial.

Parameter Comparison

Parameter	LF353MX	LF353MX/NOPB	AD648JRZ	AD648JRZ-REEL	AD648JRZ-REEL7	AD648KRZ	AD712JRZ	AD712JRZ-REEL	AD712JRZ-REEL7	AD712KRZ	AD712KRZ-REEL
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Amplifier Type	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET
Number of Circuits	2	2	2	2	2	2	2	2	2	2	2
Slew Rate (V/µs)	13	13	1.8	1.8	1.8	1.8	20	20	20	20	20
Gain Bandwidth Product (MHz)	4	4	1	1	1	1	4	4	4	4	4
Current - Input Bias (pA)	50	50	5	5	5	3	25	25	25	25	25
Voltage - Input Offset (mV)	5	5	0.75	0.75	0.75	0.3	0.3	0.3	0.3	0.3	0.3
Current - Supply (mA)	3.6	3.6	0.34	0.34	0.34	0.34	5	5	5	5	5
Voltage - Supply Span Min (V)	10	10	9	9	9	9	9	9	9	9	9
Voltage - Supply Span Max (V)	36	36	36	36	36	36	36	36	36	36	36
Operating Temperature (°C)	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70
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
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Performance):

The LF353MX/NOPB is the direct successor to the LF353MX, offering identical electrical specifications while maintaining active product status. This part is ROHS3 compliant, addressing regulatory requirements that the original LF353MX does not meet. The LF353MX/NOPB is recommended as the primary replacement for existing designs currently using the LF353MX, as it provides continuity of supply and performance without design modification.

For Enhanced Performance Applications:

The AD712 series (AD712JRZ, AD712JRZ-REEL, AD712JRZ-REEL7, AD712KRZ, AD712KRZ-REEL) provides superior performance characteristics with a slew rate of 20 V/µs compared to the LF353MX's 13 V/µs, while maintaining the same 4 MHz gain bandwidth product. These parts feature lower input offset voltage (0.3 mV versus 5 mV) and reduced input bias current (25 pA versus 50 pA). All AD712 variants are ROHS3 compliant and carry active product status. Selection among AD712 variants depends on packaging requirements: tube packaging for lower volume applications, cut tape with Digi-Reel for standard production, or tape and reel for high-volume manufacturing.

For Low-Power Applications:

The AD648 series (AD648JRZ, AD648JRZ-REEL, AD648JRZ-REEL7, AD648KRZ) offers significantly reduced supply current of 0.34 mA per channel compared to the LF353MX's 3.6 mA, making these parts suitable for battery-powered or power-constrained applications. However, the AD648 series exhibits reduced slew rate (1.8 V/µs) and gain bandwidth product (1 MHz), limiting applicability to lower-frequency signal processing. The AD648KRZ variant provides the lowest input offset voltage (0.3 mV) and input bias current (3 pA) within the AD648 family. All AD648 variants are ROHS3 compliant with active product status.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant, addressing environmental and regulatory requirements. The original LF353MX is RoHS non-compliant; designs requiring RoHS compliance must transition to one of the substitute options. All parts maintain REACH unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the LF353MX/NOPB be used as a direct drop-in replacement for the LF353MX?

A: Yes. The LF353MX/NOPB maintains identical electrical specifications including slew rate (13 V/µs), gain bandwidth product (4 MHz), input bias current (50 pA), input offset voltage (5 mV), and supply current (3.6 mA per channel). Both parts use the 8-SOIC package with identical pinout and operating temperature range (0°C to 70°C). The primary difference is product status and RoHS compliance; the LF353MX/NOPB is actively supported and ROHS3 compliant.

Q: What is the difference between AD712JRZ and AD712JRZ-REEL variants?

A: Both parts are electrically identical with identical performance specifications. The difference is packaging format: AD712JRZ is supplied in tube packaging, while AD712JRZ-REEL is supplied in cut tape with Digi-Reel format. Selection depends on manufacturing process requirements and volume. Tube packaging is typical for lower-volume or manual assembly operations, while cut tape with Digi-Reel is standard for automated pick-and-place assembly.

Q: Can AD648 series parts replace the LF353MX in all applications?

A: AD648 series parts are not suitable for all applications. While they maintain J-FET input configuration, dual circuits, 8-SOIC package, and compatible supply voltage range, they exhibit significantly reduced slew rate (1.8 V/µs versus 13 V/µs) and gain bandwidth product (1 MHz versus 4 MHz). Applications requiring higher frequency response or faster signal transitions must use LF353MX/NOPB or AD712 series. AD648 series is appropriate only for low-frequency, low-power applications where reduced supply current is the primary design requirement.

Q: What are the key differences between AD712 and AD648 series?

A: The AD712 series provides higher performance with 20 V/µs slew rate and 4 MHz bandwidth, matching or exceeding LF353MX performance. The AD648 series prioritizes low power consumption with 0.34 mA supply current but sacrifices performance with 1.8 V/µs slew rate and 1 MHz bandwidth. Both series offer superior input offset voltage (0.3 mV) and input bias current (3-25 pA) compared to the LF353MX. Selection depends on whether the application prioritizes performance or power efficiency.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (LF353MX/NOPB, AD648 series, and AD712 series) are ROHS3 compliant. The original LF353MX is RoHS non-compliant. Designs requiring RoHS compliance must transition to one of the substitute options.

Q: What is the minimum supply voltage for substitute parts?

A: The LF353MX/NOPB requires a minimum supply voltage of 10V. The AD648 and AD712 series require a minimum supply voltage of 9V. All parts support maximum supply voltage of 36V. Designs operating at supply voltages below 10V must use AD648 or AD712 series.

Q: Can I use AD712KRZ instead of AD712JRZ?

A: Yes, with performance considerations. Both are electrically identical in slew rate (20 V/µs), gain bandwidth product (4 MHz), and supply current (5 mA). The primary difference is input offset voltage: AD712KRZ specifies 0.3 mV maximum while AD712JRZ specifies 0.3 mV typical. The "K" grade indicates tighter offset voltage specification. Selection depends on application requirements for input offset voltage precision. Both are ROHS3 compliant with active product status.

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