LT1815IS8#PBF Equivalent & Substitute Parts

Part Overview

The LT1815IS8#PBF is a voltage feedback amplifier manufactured by Analog Devices Inc., designed for high-speed signal conditioning applications. This single-circuit operational amplifier operates across a 2.5 V to 11 V supply range and delivers a gain bandwidth product of 220 MHz with a slew rate of 1500 V/µs. The device is currently active in production and available in 8-SOIC surface mount packaging. Substitute parts are identified when equivalent electrical performance parameters and mechanical compatibility are required for design flexibility, inventory management, or supply chain continuity.

Substiute Parts

LT1815IS8#PBF

Analog Devices Inc.In Stock: 958LT1815IS8#PBF Datasheet

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OPA820ID

Burr BrownIn Stock: 1442OPA820ID Datasheet

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OPA820IDG4

Texas InstrumentsIn Stock: 951OPA820IDG4 Datasheet

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OPA820IDR

Texas InstrumentsIn Stock: 6093OPA820IDR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LT1815IS8#PBF are qualified based on the following electrical and mechanical compatibility criteria:

Mechanical Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB footprint compatibility.

Electrical Compatibility: Substitute parts must operate within the same functional category as voltage feedback amplifiers with a single circuit configuration. The following parameters establish substitution validity:

• Amplifier Type: Voltage Feedback
• Number of Circuits: 1
• Operating Temperature Range: -40°C to 85°C minimum
• Package / Case: 8-SOIC form factor
• Input Offset Voltage: 200 µV (matching specification)
• RoHS3 Compliance: Required for regulatory alignment

Performance Considerations: While substitute parts may exhibit different slew rates, gain bandwidth products, and supply current specifications, these variations remain within acceptable operational ranges for voltage feedback amplifier applications. The OPA820 series (OPA820ID, OPA820IDG4, OPA820IDR) meets all mechanical and core electrical compatibility requirements.

Parameter Comparison

Engineering Selection Recommendations

OPA820ID (Burr Brown) This substitute part maintains voltage feedback amplifier architecture with single-circuit configuration and identical 8-SOIC packaging. The OPA820ID operates across a 5 V to 12 V supply range, which encompasses the upper operating range of the LT1815IS8#PBF. Input offset voltage specification matches at 200 µV. Operating temperature range aligns at -40°C to 85°C. This part is currently active in production. RoHS compliance status is not specified in available documentation.

OPA820IDG4 (Texas Instruments) This variant shares identical electrical specifications with OPA820ID and maintains the required 8-SOIC package format. The part is ROHS3 compliant and rated for -40°C to 85°C operation. However, this part is listed as discontinued at DiGi Electronics, which may impact long-term availability for production applications.

OPA820IDR (Texas Instruments) This substitute part is functionally equivalent to OPA820IDG4 with identical electrical parameters and 8-SOIC packaging. The OPA820IDR is currently active in production status and ROHS3 compliant. This variant is supplied in Cut Tape (CT) and Digi-Reel® packaging format, supporting high-volume manufacturing workflows. Inventory availability is substantial at 6062 pieces.

Supply Voltage Consideration: The LT1815IS8#PBF operates with a minimum supply voltage of 2.5 V, while all OPA820 substitutes require a minimum of 5 V. Circuit designs operating below 5 V supply voltage cannot use these substitute parts.

Frequently Asked Questions (FAQ)

Q: Can the OPA820 series parts directly replace the LT1815IS8#PBF without PCB modifications?

A: Yes, all three OPA820 variants (OPA820ID, OPA820IDG4, OPA820IDR) use the identical 8-SOIC (0.154", 3.90mm Width) surface mount package. Direct footprint compatibility is established. Pin configuration and functional operation as voltage feedback amplifiers are equivalent.

Q: What is the primary electrical difference between the LT1815IS8#PBF and OPA820 substitutes?

A: The LT1815IS8#PBF delivers a slew rate of 1500 V/µs compared to 240 V/µs for the OPA820 series. The LT1815IS8#PBF also provides a -3dB bandwidth of 350 MHz versus 800 MHz for OPA820 parts. The LT1815IS8#PBF supports a lower minimum supply voltage of 2.5 V, while OPA820 parts require 5 V minimum.

Q: Are there supply voltage limitations when substituting with OPA820 parts?

A: Yes. The OPA820 series requires a minimum supply voltage of 5 V. Applications designed to operate the LT1815IS8#PBF at supply voltages below 5 V cannot use OPA820 substitutes. Verify circuit supply voltage specifications before substitution.

Q: Which OPA820 variant should be selected for new production designs?

A: The OPA820IDR is recommended for new production designs. It is currently active in production status, ROHS3 compliant, and available in high quantities (6062 pieces). The OPA820IDG4 is discontinued at DiGi Electronics and should not be selected for new designs requiring long-term supply assurance.

Q: Do all substitute parts meet RoHS3 compliance requirements?

A: The OPA820IDG4 and OPA820IDR are explicitly ROHS3 compliant. The OPA820ID RoHS compliance status is not specified in available documentation. For applications requiring RoHS3 certification, OPA820IDR is the preferred substitute.

Q: What is the input bias current difference between the main part and substitutes?

A: The LT1815IS8#PBF specifies 2 µA input bias current, while all OPA820 variants specify 9 µA. This 7 µA difference may affect circuit performance in applications with high source impedance or precision transimpedance configurations. Evaluate input bias current impact on circuit accuracy before substitution.

Q: Are the packaging formats (Tube, Cut Tape, Digi-Reel) interchangeable for assembly?

A: Packaging formats affect supply and handling but do not impact electrical or mechanical compatibility. Tube packaging (LT1815IS8#PBF, OPA820IDG4) is suitable for lower-volume assembly. Cut Tape and Digi-Reel formats (OPA820IDR) support automated high-volume pick-and-place assembly. Select packaging format based on manufacturing process requirements, not component functionality.