LF398AN Sample and Hold Amplifier Equivalent & Substitute Parts

Part Overview

The LF398AN is a Sample and Hold Amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-PDIP package. This linear amplifier device is designed for precision sampling and holding of analog signals in data acquisition and signal processing applications. The LF398AN is classified as an obsolete product, making equivalent and substitute parts necessary for ongoing system maintenance, redesign, and new production implementations. Direct substitutes with active product status are available from both the original manufacturer and alternative suppliers.

Substiute Parts

LF398AN

Texas InstrumentsIn Stock: 1410LF398AN Datasheet

Current PartRFQ

LF398AN/NOPB

Texas InstrumentsIn Stock: 1537LF398AN/NOPB Datasheet

DirectRFQ

LF398N8#PBF

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LF398AN is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Amplifier Type: Sample and Hold (single circuit configuration)
• Input Bias Current: 10 nA maximum
• Supply Voltage Range: 10 V to 36 V
• Operating Temperature: 0°C to 70°C

Physical Parameters:

• Package Type: 8-DIP (0.300", 7.62mm)
• Mounting: Through Hole
• Pin Configuration: 8-PDIP

Acceptable Tolerance:

• Voltage - Input Offset: Up to 2 mV (original specification 1 mV; substitute specification 2 mV remains within functional tolerance for sample-and-hold applications)

All substitute parts listed maintain identical or superior electrical performance within these defined parameters. Substitutes are grouped by manufacturer and product status to facilitate procurement decisions.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The LF398AN/NOPB from Texas Instruments is the primary substitute for the obsolete LF398AN. This part maintains identical electrical specifications and is manufactured by the original equipment supplier. The LF398AN/NOPB carries Active product status and ROHS3 compliance, making it suitable for new designs and production environments with RoHS requirements. Packaging is supplied in Tube format with 1478 units currently in stock.

For Cross-Manufacturer Substitution:

The LF398N8#PBF from Analog Devices Inc. is a functionally equivalent alternative with Active product status and ROHS3 compliance. The primary electrical difference is the Voltage - Input Offset specification of 2 mV compared to the original 1 mV. This variance remains within acceptable tolerances for sample-and-hold amplifier applications. The LF398N8#PBF is supplied in Tube packaging with 770 units currently in stock.

Compliance Considerations:

Both substitute parts are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements. The original LF398AN is RoHS non-compliant, making substitution necessary for applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can the LF398AN/NOPB be used as a direct drop-in replacement for the LF398AN?

A: Yes. The LF398AN/NOPB maintains identical electrical specifications, package configuration, and pin assignment. Both parts are housed in 8-DIP (0.300", 7.62mm) packages with Through Hole mounting. No circuit modifications are required.

Q: What is the difference between the LF398AN and LF398AN/NOPB?

A: The LF398AN/NOPB is the active production equivalent of the obsolete LF398AN. Both are manufactured by Texas Instruments with identical electrical performance. The primary differences are product status (Active vs. Obsolete) and packaging format (Tube vs. Bulk). The /NOPB designation indicates lead-free, RoHS3 compliant construction.

Q: Is the LF398N8#PBF from Analog Devices a suitable substitute?

A: Yes. The LF398N8#PBF is functionally equivalent with all critical parameters matching the LF398AN. The Voltage - Input Offset specification is 2 mV versus 1 mV on the original part. This difference is within acceptable operating tolerances for sample-and-hold amplifier circuits and does not affect functional compatibility.

Q: Are there any package or pinout differences between these substitutes?

A: No. All three parts (LF398AN, LF398AN/NOPB, and LF398N8#PBF) use identical 8-DIP (0.300", 7.62mm) packages with Through Hole mounting. Pin configuration and spacing are identical, enabling direct PCB compatibility without layout modifications.

Q: Which substitute should be selected for new production designs?

A: For new designs, either the LF398AN/NOPB (Texas Instruments) or LF398N8#PBF (Analog Devices Inc.) are appropriate selections. Both carry Active product status and ROHS3 compliance. Selection may be based on supplier availability, lead time, inventory levels, or existing design qualification with either manufacturer.

Q: What is the operating temperature range for these parts?

A: All three parts operate across the same temperature range: 0°C to 70°C. This specification applies to the LF398AN, LF398AN/NOPB, and LF398N8#PBF.

Q: Are these parts suitable for applications requiring RoHS compliance?

A: The LF398AN/NOPB and LF398N8#PBF are both ROHS3 compliant and suitable for RoHS-regulated applications. The original LF398AN is RoHS non-compliant and should not be used in new designs subject to RoHS requirements.