LF398N Sample and Hold Amplifier Equivalent & Substitute Parts

Part Overview

The LF398N is a Sample and Hold Amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-DIP package for through-hole mounting applications. This device implements a single sample and hold circuit with specified electrical characteristics including 10 nA input bias current and 2 mV input offset voltage.

The LF398N carries an Obsolete product status. Locating equivalent and substitute parts is necessary for design continuity, production support, and long-term system reliability when original inventory becomes unavailable or when transitioning to active product lines.

Substiute Parts

LF398N

Texas InstrumentsIn Stock: 5020LF398N Datasheet

Current PartRFQ

LF398N/NOPB

Texas InstrumentsIn Stock: 5832LF398N/NOPB Datasheet

DirectRFQ

LF398N8#PBF

Analog Devices Inc.In Stock: 825LF398N8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LF398N is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Amplifier Type: Sample and Hold
• Number of Circuits: 1 circuit per package

Electrical Parameters:

• Current - Input Bias: 10 nA
• Voltage - Input Offset: 2 mV
• Current - Supply: 4.5 mA
• Voltage - Supply Span: 10 V minimum to 36 V maximum
• Operating Temperature Range: 0°C to 70°C

Physical Parameters:

• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Supplier Device Package: 8-PDIP

All identified substitute parts match these parameters exactly. Substitution is valid when all electrical and mechanical specifications align with the original LF398N requirements.

Parameter Comparison

Engineering Selection Recommendations

LF398N/NOPB (Texas Instruments)

This part is the direct Texas Instruments equivalent to the obsolete LF398N. It maintains identical electrical and mechanical specifications while carrying Active product status. The LF398N/NOPB is ROHS3 compliant and supplied in tube packaging. This part is the primary selection for applications requiring Texas Instruments sourcing or existing supply chain continuity.

LF398N8#PBF (Analog Devices Inc.)

This part is manufactured by Analog Devices Inc. and provides functional equivalence to the LF398N across all critical electrical and mechanical parameters. The LF398N8#PBF carries Active product status and ROHS3 compliance. Selection of this part is appropriate when Analog Devices sourcing is preferred or when supply availability from Texas Instruments is constrained.

Both substitute parts are suitable for direct replacement in applications originally designed for the LF398N, provided that the through-hole 8-DIP package footprint and electrical specifications remain compatible with the target circuit design.

Frequently Asked Questions (FAQ)

Q: Can the LF398N/NOPB be used as a direct replacement for the LF398N?

A: Yes. The LF398N/NOPB is electrically and mechanically identical to the LF398N. Both parts share the same 8-DIP package, identical electrical specifications (10 nA input bias current, 2 mV input offset voltage, 4.5 mA supply current, 10 V to 36 V supply range), and identical operating temperature range (0°C to 70°C). The primary difference is product status: LF398N/NOPB is Active while LF398N is Obsolete.

Q: What is the difference between LF398N and LF398N/NOPB?

A: Both parts are manufactured by Texas Instruments and are functionally equivalent. The designation "/NOPB" indicates "No Plumbum" (lead-free) packaging and ROHS3 compliance. The LF398N/NOPB is the current production version, while LF398N is obsolete. Electrical performance is identical.

Q: Can the Analog Devices LF398N8#PBF replace the Texas Instruments LF398N?

A: Yes. The LF398N8#PBF meets all electrical and mechanical substitution criteria. It is a sample and hold amplifier with identical input bias current (10 nA), input offset voltage (2 mV), supply current (4.5 mA), supply voltage range (10 V to 36 V), operating temperature range (0°C to 70°C), and 8-DIP package configuration. Cross-manufacturer substitution is valid when these parameters align.

Q: Are there any compliance differences between these parts?

A: The LF398N is RoHS non-compliant. Both substitute parts, LF398N/NOPB and LF398N8#PBF, are ROHS3 compliant. If RoHS compliance is a design requirement, either substitute part is appropriate. If legacy non-compliant sourcing is required, the original LF398N must be specified.

Q: What packaging formats are available for these substitute parts?

A: Both LF398N/NOPB and LF398N8#PBF are supplied in tube packaging. The original LF398N packaging format is not specified in the available data. All three parts use the same 8-DIP (0.300", 7.62mm) physical package suitable for through-hole PCB mounting.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Current inventory levels differ: LF398N/NOPB has 5820 pieces in stock, while LF398N8#PBF has 770 pieces in stock. The original LF398N has 4919 pieces available but carries Obsolete status. For new designs or long-term production, LF398N/NOPB is recommended due to higher inventory availability and Active product status.