LT1398CS#PBF Equivalent & Substitute Parts

Part Overview

The LT1398CS#PBF is a Current Feedback Amplifier manufactured by Analog Devices Inc., configured as a dual-circuit operational amplifier in a 16-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. The part operates across a 4V to 12V supply range with a slew rate of 800V/µs and 300 MHz bandwidth, suitable for high-speed signal conditioning and amplification applications. Identification of equivalent substitute parts is necessary due to the Last Time Buy status and to ensure long-term design continuity and supply chain reliability.

Substiute Parts

LT1398CS#PBF

Analog Devices Inc.In Stock: 1057LT1398CS#PBF Datasheet

Current PartRFQ

LT1396CS8#PBF

Analog Devices Inc.In Stock: 1784LT1396CS8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LT1398CS#PBF is determined by the following critical parameters that must remain compatible:

Mandatory Compatibility Parameters:

• Amplifier Type: Current Feedback architecture
• Number of Circuits: Dual-channel configuration (2 circuits)
• Supply Voltage Range: 4V to 12V operation
• Current - Supply: 4.6 mA per channel maximum
• Current - Output / Channel: 80 mA per channel
• Operating Temperature: 0°C to 70°C
• Mounting Type: Surface Mount
• RoHS and REACH Compliance: ROHS3 Compliant, REACH Unaffected

Performance Parameters Allowing Variation:

• Slew Rate: 800 V/µs or greater
• Bandwidth: 300 MHz or greater
• Input Bias Current: 10 µA or lower
• Input Offset Voltage: 1.5 mV or lower

The LT1396CS8#PBF qualifies as a manufacturer-recommended substitute because it maintains all mandatory compatibility parameters while offering equal or superior performance characteristics. The primary difference is package configuration: the substitute uses an 8-SOIC package instead of 16-SOIC, which affects board layout but maintains electrical equivalence for dual-channel operation.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LT1396CS8#PBF

The LT1396CS8#PBF is the manufacturer-recommended substitute for the LT1398CS#PBF. Selection of this substitute is justified on the following engineering grounds:

1. Product Status Alignment: The LT1396CS8#PBF maintains Active product status, ensuring continued availability and long-term supply chain stability, whereas the LT1398CS#PBF is Last Time Buy with limited inventory.

2. Regulatory Compliance: Both parts maintain identical ROHS3 compliance and REACH Unaffected status, satisfying all environmental and regulatory requirements without modification.

3. Electrical Equivalence: All critical electrical parameters remain within compatible ranges. The substitute demonstrates superior performance in -3dB bandwidth (400 MHz versus 300 MHz) and input offset voltage (1.0 mV versus 1.5 mV), providing enhanced signal fidelity without compromising existing circuit designs.

4. Supply Chain Continuity: With 1723 units in stock compared to 1022 units for the main part, the substitute provides superior inventory availability for immediate and future procurement.

5. Package Consideration: The transition from 16-SOIC to 8-SOIC packaging requires PCB layout modification. The identical 3.90mm width maintains compatibility with standard surface mount assembly processes. Pin configuration differences necessitate schematic and layout review prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the LT1396CS8#PBF be used as a direct pin-for-pin replacement for the LT1398CS#PBF?

A: No. While both devices are dual-channel current feedback amplifiers with identical electrical performance parameters, the package configurations differ (16-SOIC versus 8-SOIC). Pin assignments are not identical. PCB layout and schematic modifications are required. Consult the respective device datasheets for pinout details before implementation.

Q: What are the key electrical differences between these two parts?

A: The LT1396CS8#PBF offers superior -3dB bandwidth (400 MHz versus 300 MHz) and lower input offset voltage (1.0 mV versus 1.5 mV). All other electrical parameters, including slew rate, supply current, output current, and operating temperature range, are identical. These differences favor the substitute in high-frequency and precision applications.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the LT1398CS#PBF and LT1396CS8#PBF are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: Why is the LT1398CS#PBF marked as Last Time Buy?

A: Last Time Buy status indicates that Analog Devices Inc. has discontinued production of this part number. Existing inventory is available for purchase, but no future production is planned. The LT1396CS8#PBF, with Active status, represents the recommended path for new designs and long-term supply continuity.

Q: What is the moisture sensitivity level, and does it affect handling?

A: Both parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling procedures for surface mount components apply without special moisture control requirements.

Q: Can I use the LT1396CS8#PBF in existing designs without circuit modification?

A: Circuit modification is not required if the superior performance characteristics (higher bandwidth and lower offset voltage) are acceptable. However, PCB layout must be redesigned to accommodate the different package configuration. Functional circuit operation remains compatible across the 4V to 12V supply range and 0°C to 70°C temperature range.