LF356N J-FET Operational Amplifier Equivalent & Substitute Parts

Part Overview

The LF356N is a J-FET input operational amplifier manufactured by Texas Instruments, belonging to the BI-FET™ series. This device is classified as a linear amplifier integrated circuit in 8-DIP packaging and is designed for applications requiring low input bias current and high input impedance characteristics typical of J-FET amplifier architectures.

The LF356N carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

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 Range	0 to 70	°C
Package / Case	8-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the LF356N is determined by strict equivalence across the following critical parameters:

Electrical Performance Parameters:

Amplifier Type: J-FET architecture
Number of Circuits: Single circuit configuration
Slew Rate: 12 V/µs
Gain Bandwidth Product: 5 MHz
Input Bias Current: 30 pA
Input Offset Voltage: 3 mV
Supply Current: 5 mA
Supply Voltage Span: 30 V minimum and maximum

Physical and Environmental Parameters:

Package Type: 8-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Operating Temperature Range: 0°C to 70°C

Substitute parts must maintain identical electrical specifications and physical form factor to ensure direct compatibility without circuit redesign or board layout modification.

Parameter Comparison

Parameter	LF356N	LF356N/NOPB	Match Status
Manufacturer	Texas Instruments	Texas Instruments	Identical
Amplifier Type	J-FET	J-FET	Identical
Number of Circuits	1	1	Identical
Slew Rate	12 V/µs	12 V/µs	Identical
Gain Bandwidth Product	5 MHz	5 MHz	Identical
Current - Input Bias	30 pA	30 pA	Identical
Voltage - Input Offset	3 mV	3 mV	Identical
Current - Supply	5 mA	5 mA	Identical
Voltage - Supply Span (Min)	30 V	30 V	Identical
Voltage - Supply Span (Max)	30 V	30 V	Identical
Operating Temperature	0°C to 70°C	0°C to 70°C	Identical
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	Identical
Mounting Type	Through Hole	Through Hole	Identical
Product Status	Obsolete	Active	Different
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Different
Packaging Type	Not specified	Tube	Different

Engineering Selection Recommendations

LF356N/NOPB as Primary Substitute:

The LF356N/NOPB is the direct equivalent substitute for the LF356N. All electrical performance parameters, physical dimensions, and functional specifications are identical. The primary distinction is product status and regulatory compliance.

Product Status Consideration: The LF356N carries Obsolete status, indicating discontinued manufacturing and limited availability. The LF356N/NOPB maintains Active product status, ensuring ongoing availability and supply chain support from Texas Instruments.

Regulatory Compliance: The LF356N/NOPB is ROHS3 Compliant, whereas the original LF356N is RoHS non-compliant. For applications subject to RoHS directives or customer requirements mandating RoHS compliance, the LF356N/NOPB is the appropriate selection.

Packaging Consideration: The LF356N/NOPB is supplied in Tube packaging, compared to unspecified packaging for the LF356N. Both devices utilize identical 8-DIP form factor and Through Hole mounting, ensuring direct board-level compatibility.

Selection Basis: Component selection should prioritize the LF356N/NOPB due to active product status, regulatory compliance, and guaranteed supply availability. No circuit redesign or performance compromise is required for this substitution.

Frequently Asked Questions (FAQ)

Q: Can LF356N/NOPB be used as a direct replacement for LF356N in existing designs?

A: Yes. The LF356N/NOPB is electrically and mechanically identical to the LF356N. All electrical parameters, including slew rate, gain bandwidth product, input bias current, and supply specifications are equivalent. The 8-DIP Through Hole package is identical, enabling direct board-level substitution without circuit modification.

Q: What is the difference between LF356N and LF356N/NOPB?

A: The devices are electrically identical. The primary differences are: (1) Product Status—LF356N is Obsolete; LF356N/NOPB is Active; (2) RoHS Compliance—LF356N is non-compliant; LF356N/NOPB is ROHS3 Compliant; (3) Packaging—LF356N/NOPB is supplied in Tube format. The "/NOPB" suffix indicates lead-free, RoHS-compliant manufacturing.

Q: Is the 8-DIP package identical between both parts?

A: Yes. Both LF356N and LF356N/NOPB use the 8-DIP (0.300", 7.62mm) package with Through Hole mounting. Pin configuration, spacing, and board footprint are identical.

Q: Why should I select LF356N/NOPB over LF356N?

A: The LF356N/NOPB is recommended due to Active product status, ensuring continued availability and supply chain reliability. The LF356N is Obsolete and subject to limited inventory. Additionally, LF356N/NOPB meets ROHS3 compliance requirements, supporting modern manufacturing and regulatory standards.

Q: Are there any performance differences between the two parts?

A: No. Electrical performance is identical across all specified parameters: 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).

Q: What is the operating temperature range for both devices?

A: Both LF356N and LF356N/NOPB operate across 0°C to 70°C. Temperature performance is identical.

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