LF356MX Equivalent & Substitute Parts

Part Overview

The LF356MX is a J-FET input operational amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as obsolete, though 25,631 units remain in stock. The LF356MX belongs to the BI-FET™ series and is designed for applications requiring low input bias current and high input impedance characteristics typical of J-FET amplifier architectures.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term supply chain planning, and new product development. Active alternatives with comparable or enhanced electrical characteristics are available from multiple manufacturers including Analog Devices Inc. and STMicroelectronics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	12	V/µs
Gain Bandwidth Product	5	MHz
Current - Input Bias	30	pA
Voltage - Input Offset	3	mV
Current - Supply	5	mA
Voltage - Supply Span	30	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	—

Substitute Part Grouping Explanation

Substitution of the LF356MX is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input architecture
Number of Circuits: Single circuit (1)
Package / Case: 8-SOIC surface mount form factor
Mounting Type: Surface Mount
Operating Temperature Range: Minimum 0°C to 70°C coverage

Secondary Compatibility Parameters:

Slew Rate: 12 V/µs or greater
Gain Bandwidth Product: 5 MHz or greater
Current - Input Bias: 30 pA or lower
Voltage - Input Offset: 3 mV or lower
Current - Supply: 5 mA or lower
Voltage - Supply Span: Minimum 30 V or greater

Substitute parts must satisfy all primary criteria. Secondary parameters define functional equivalence; parts exceeding these specifications remain valid substitutes provided they do not introduce incompatibilities in the target application circuit.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Current (mA)	Supply Span (V)	Temp Range (°C)	RoHS Status	Product Status
LF356MX	Texas Instruments	J-FET	12	5	30	3	5	30	0 to 70	Non-compliant	Obsolete
LF356MX/NOPB	Texas Instruments	J-FET	12	5	30	3	5	30	0 to 70	ROHS3 Compliant	Active
AD711JRZ	Analog Devices Inc.	J-FET	20	4	15	0.3	2.5	9 to 36	0 to 70	ROHS3 Compliant	Active
AD711JRZ-REEL	Analog Devices Inc.	J-FET	20	4	15	0.3	2.5	9 to 36	0 to 70	ROHS3 Compliant	Active
AD8510ARZ-REEL	Analog Devices Inc.	J-FET	20	8	25	0.1	2.2	9 to 36	-40 to 125	ROHS3 Compliant	Active
ADA4000-1ARZ	Analog Devices Inc.	J-FET	20	5	5	0.2	1.35	8 to 36	-40 to 125	ROHS3 Compliant	Active
LF351D	STMicroelectronics	J-FET	16	4	20	3	1.4	6 to 32	0 to 70	ROHS3 Compliant	Active
LT1792CS8#PBF	Analog Devices Inc.	J-FET	3.4	5.6	300	0.2	4.2	9 to 40	0 to 70	ROHS3 Compliant	Active
LT1792CS8#TRPBF	Analog Devices Inc.	J-FET	3.4	5.6	300	0.2	4.2	9 to 40	0 to 70	ROHS3 Compliant	Active
LT1792IS8#PBF	Analog Devices Inc.	J-FET	3.4	5.6	300	0.2	4.2	9 to 40	-40 to 85	ROHS3 Compliant	Active
LT1792IS8#TRPBF	Analog Devices Inc.	J-FET	3.4	5.6	300	0.2	4.2	9 to 40	-40 to 85	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Specifications):

LF356MX/NOPB is the direct active equivalent. This part maintains identical electrical parameters to the LF356MX while offering ROHS3 compliance and active product status. It is available in Cut Tape and Digi-Reel packaging with 90,234 units in stock. Selection of LF356MX/NOPB eliminates design modification requirements and provides the most straightforward transition path from the obsolete LF356MX.

Primary Substitutes (Enhanced Performance, Full Compatibility):

AD711JRZ and AD711JRZ-REEL (Analog Devices Inc.) provide superior input bias current (15 pA vs. 30 pA) and input offset voltage (0.3 mV vs. 3 mV). These parts maintain J-FET architecture, single-circuit configuration, and 8-SOIC packaging. The expanded supply voltage range (9 to 36 V vs. 30 V fixed) offers greater design flexibility. Both variants are ROHS3 compliant and active. AD711JRZ is packaged in Tube format (10,158 units available); AD711JRZ-REEL is supplied in Tape & Reel format (6,819 units available).

Secondary Substitutes (Enhanced Specifications, Extended Temperature Range):

AD8510ARZ-REEL (Analog Devices Inc.) delivers higher gain bandwidth product (8 MHz vs. 5 MHz), lower input offset voltage (0.1 mV vs. 3 mV), and extended operating temperature range (-40°C to 125°C vs. 0°C to 70°C). Supply current is reduced to 2.2 mA. This part is suitable for applications requiring enhanced precision and wider temperature operation. ROHS3 compliant; 2,700 units in stock.

ADA4000-1ARZ (Analog Devices Inc.) offers the lowest input bias current (5 pA) and lowest supply current (1.35 mA) among all substitutes. Gain bandwidth product matches the LF356MX at 5 MHz. Extended temperature range (-40°C to 125°C) and expanded supply voltage range (8 to 36 V) provide design flexibility. ROHS3 compliant; 3,654 units available in Tube packaging.

Tertiary Substitutes (Comparable Performance, Alternative Manufacturers):

LF351D (STMicroelectronics) maintains J-FET architecture and 8-SOIC packaging with operating temperature range matching the LF356MX (0°C to 70°C). Input offset voltage is identical at 3 mV. Slew rate (16 V/µs) exceeds the LF356MX specification. Supply current is significantly reduced to 1.4 mA. ROHS3 compliant; 1,159 units in stock.

Limited Substitutes (Reduced Slew Rate, Specialized Applications):

LT1792 variants (Analog Devices Inc.) in multiple temperature and packaging configurations exhibit reduced slew rate (3.4 V/µs vs. 12 V/µs) and elevated input bias current (300 pA vs. 30 pA). These characteristics limit applicability to low-frequency or non-critical slew-rate applications. Gain bandwidth product (5.6 MHz) exceeds the LF356MX. All variants are ROHS3 compliant and active. Temperature variants include 0°C to 70°C (LT1792CS8 series) and -40°C to 85°C (LT1792IS8 series). Packaging options include Tube and Tape & Reel formats with combined inventory of 5,506 units.

Compliance and Supply Chain Considerations:

All substitute parts listed are ROHS3 compliant, addressing regulatory requirements that the obsolete LF356MX does not meet. All substitutes maintain REACH Unaffected status and EAR99 export classification. Selection should prioritize active product status to ensure long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can LF356MX/NOPB be used as a direct drop-in replacement for LF356MX?

A: Yes. LF356MX/NOPB is electrically and mechanically identical to LF356MX. Both parts share identical slew rate (12 V/µs), gain bandwidth product (5 MHz), input bias current (30 pA), input offset voltage (3 mV), supply current (5 mA), and supply voltage span (30 V). Both are packaged in 8-SOIC surface mount form factor. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. Non-compliant). No circuit modifications are required.

Q: What are the key differences between AD711JRZ and the LF356MX?

A: AD711JRZ maintains J-FET architecture and 8-SOIC packaging but offers improved input bias current (15 pA vs. 30 pA) and superior input offset voltage (0.3 mV vs. 3 mV). The supply voltage range is expanded (9 to 36 V vs. 30 V fixed). Slew rate is higher (20 V/µs vs. 12 V/µs), and supply current is lower (2.5 mA vs. 5 mA). These enhancements make AD711JRZ suitable for precision applications requiring lower offset voltage and wider supply flexibility. Operating temperature range remains 0°C to 70°C.

Q: Is the LT1792 series suitable as a substitute for the LF356MX?

A: LT1792 variants are not recommended as primary substitutes due to significantly reduced slew rate (3.4 V/µs vs. 12 V/µs) and elevated input bias current (300 pA vs. 30 pA). These characteristics make LT1792 unsuitable for applications requiring fast transient response or low input bias current. LT1792 is appropriate only for low-frequency or non-critical slew-rate applications where the reduced performance is acceptable. Gain bandwidth product (5.6 MHz) exceeds LF356MX specification.

Q: What is the advantage of AD8510ARZ-REEL over other substitutes?

A: AD8510ARZ-REEL delivers the highest gain bandwidth product (8 MHz vs. 5 MHz) and the lowest input offset voltage (0.1 mV vs. 3 mV) among all listed substitutes. Supply current is reduced to 2.2 mA. Extended operating temperature range (-40°C to 125°C) enables deployment in wider environmental conditions. These specifications make AD8510ARZ-REEL optimal for precision instrumentation and temperature-critical applications. Trade-off is higher output current capability (70 mA vs. unspecified for LF356MX).

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Tube, Cut Tape, Tape & Reel, Digi-Reel) does not affect electrical performance. Packaging format determines supply method and handling procedures. Selection should be based on manufacturing process requirements and inventory management practices. Electrically identical parts with different packaging designations (e.g., AD711JRZ vs. AD711JRZ-REEL) deliver identical performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original LF356MX is RoHS non-compliant. If RoHS compliance is a design requirement, LF356MX/NOPB or any of the Analog Devices or STMicroelectronics alternatives must be selected.

Q: What is the supply voltage range compatibility?

A: LF356MX operates at fixed 30 V supply span. Substitute parts offer expanded ranges: AD711JRZ (9 to 36 V), AD8510ARZ-REEL (9 to 36 V), ADA4000-1ARZ (8 to 36 V), LF351D (6 to 32 V), and LT1792 variants (9 to 40 V). Expanded supply ranges provide design flexibility but do not affect compatibility if the original 30 V specification is maintained in the circuit.

Q: Which substitute offers the lowest power consumption?

A: ADA4000-1ARZ exhibits the lowest supply current at 1.35 mA, compared to 5 mA for LF356MX. LF351D (1.4 mA) and AD8510ARZ-REEL (2.2 mA) also provide significant power reduction. Selection should balance power consumption requirements against other performance criteria such as slew rate and input offset voltage.

Q: Can LF351D be used in applications requiring 0°C to 70°C operation?

A: Yes. LF351D operating temperature range (0°C to 70°C) matches the LF356MX specification exactly. LF351D is suitable for applications with identical temperature requirements. For applications requiring extended temperature operation, AD8510ARZ-REEL or ADA4000-1ARZ (-40°C to 125°C) or LT1792IS8 variants (-40°C to 85°C) should be considered.

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