LT1673CS8#TRPBF Equivalent & Substitute Parts

Part Overview

The LT1673CS8#TRPBF is a general purpose operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) rail-to-rail output device in an 8-SOIC surface mount package. This part is classified as a linear amplifier and maintains Active product status. The LT1673CS8#TRPBF is designed for applications requiring low-power, general-purpose amplification with rail-to-rail output capability across a wide supply voltage range of 2.2 V to 36 V.

Equivalent and substitute parts are identified when alternative manufacturers offer dual-channel general purpose amplifiers with compatible electrical characteristics, identical or superior performance parameters, and matching package geometries. Substitution becomes necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit selection from multiple qualified sources.

Substiute Parts

LT1673CS8#TRPBF

Analog Devices Inc.In Stock: 1041LT1673CS8#TRPBF Datasheet

Current PartRFQ

OPA2171AQDRQ1

Texas InstrumentsIn Stock: 5513OPA2171AQDRQ1 Datasheet

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OPA2172ID

Texas InstrumentsIn Stock: 2158OPA2172ID Datasheet

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OPA2172IDR

Texas InstrumentsIn Stock: 17413OPA2172IDR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LT1673CS8#TRPBF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Dual-channel (2 circuit) configuration
• Rail-to-rail output capability
• 8-SOIC surface mount package with 0.154" (3.90mm) width
• Supply voltage range compatibility: minimum 2.2 V to maximum 36 V
• General purpose amplifier classification

Electrical Performance Parameters: Substitute parts must maintain functional equivalence across slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and output current per channel. Parts with superior performance characteristics (higher slew rate, greater bandwidth, lower bias current, lower offset voltage, or higher output current) are acceptable substitutes provided all mandatory criteria are satisfied.

Compliance & Certification: All identified substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the primary part.

The three substitute parts identified—OPA2171AQDRQ1, OPA2172ID, and OPA2172IDR—satisfy all mandatory compatibility criteria and are manufactured by Texas Instruments, a qualified alternative source for general purpose dual-channel amplifiers in this package category.

Parameter Comparison

Engineering Selection Recommendations

OPA2172IDR and OPA2172ID (Texas Instruments)

The OPA2172IDR and OPA2172ID represent the highest performance substitutes for the LT1673CS8#TRPBF. Both parts deliver identical electrical specifications with 10 V/µs slew rate, 10 MHz gain bandwidth product, 8 pA input bias current, and 75 mA output current per channel. The OPA2172IDR is supplied in Cut Tape (CT) & Digi-Reel® packaging with 17,400 units in stock, while the OPA2172ID is supplied in Tube packaging with 2,083 units in stock. Both maintain MSL 2 (1 Year) moisture sensitivity and support the full 4.5 V to 36 V supply range. These parts are suitable for applications where the LT1673CS8#TRPBF supply is constrained and higher performance characteristics are acceptable.

OPA2171AQDRQ1 (Texas Instruments)

The OPA2171AQDRQ1 is qualified to AEC-Q100 automotive standards and carries automotive-grade designation. This part features 1.5 V/µs slew rate and 3 MHz gain bandwidth product with 35 mA output current per channel. The OPA2171AQDRQ1 operates across 2.7 V to 36 V supply range and supports extended operating temperature of -40°C to 125°C. MSL 3 (168 Hours) moisture sensitivity applies. This substitute is appropriate for automotive applications or designs requiring extended temperature operation and automotive qualification. Supply availability is 5,500 units in Cut Tape (CT) & Digi-Reel® packaging.

Supply Voltage Consideration

The LT1673CS8#TRPBF operates at minimum 2.2 V supply voltage. The OPA2172 series requires minimum 4.5 V, while the OPA2171AQDRQ1 requires minimum 2.7 V. Applications operating below 2.7 V supply voltage cannot use any identified substitute parts.

Temperature Range Consideration

The LT1673CS8#TRPBF operates across 0°C to 70°C. All substitute parts support extended temperature range of -40°C to 125°C, providing broader operational capability for temperature-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the OPA2172IDR directly replace the LT1673CS8#TRPBF in existing PCB designs?

A: Yes, the OPA2172IDR is a direct pin-compatible substitute. Both parts use identical 8-SOIC (0.154", 3.90mm width) surface mount packages with matching pinout. PCB layout modifications are not required. However, the OPA2172IDR requires minimum 4.5 V supply voltage compared to the LT1673CS8#TRPBF minimum of 2.2 V. Verify that your circuit supplies at least 4.5 V before substitution.

Q: What is the key difference between OPA2172IDR and OPA2172ID?

A: The OPA2172IDR and OPA2172ID are electrically identical with identical performance specifications. The primary difference is packaging format: OPA2172IDR is supplied in Cut Tape (CT) & Digi-Reel® format with 17,400 units in stock, while OPA2172ID is supplied in Tube format with 2,083 units in stock. Selection depends on your procurement and assembly requirements.

Q: Is the OPA2171AQDRQ1 suitable for non-automotive applications?

A: Yes, the OPA2171AQDRQ1 is a general purpose dual-channel amplifier with automotive qualification. Automotive-qualified parts meet stringent reliability and quality standards and are suitable for any application. The OPA2171AQDRQ1 is appropriate for non-automotive designs when extended temperature operation (-40°C to 125°C) is required or when automotive-grade component sourcing is preferred.

Q: What are the supply current differences between substitute parts?

A: The LT1673CS8#TRPBF draws 1.9 µA total supply current (x2 channels). The OPA2172 series draws 1.6 mA total supply current, approximately 840 times higher. The OPA2171AQDRQ1 draws 475 µA total supply current, approximately 250 times higher. For ultra-low-power applications, the LT1673CS8#TRPBF remains the optimal choice. Substitute parts are appropriate when higher supply current is acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all identified substitute parts—OPA2171AQDRQ1, OPA2172ID, and OPA2172IDR—are ROHS3 compliant, matching the compliance status of the LT1673CS8#TRPBF.

Q: What is the minimum supply voltage for each part?

A: The LT1673CS8#TRPBF operates at minimum 2.2 V. The OPA2171AQDRQ1 operates at minimum 2.7 V. The OPA2172ID and OPA2172IDR operate at minimum 4.5 V. Applications with supply voltages below 2.7 V cannot use any substitute parts. Applications with supply voltages between 2.7 V and 4.5 V can use only the OPA2171AQDRQ1.

Q: Can I use OPA2172 parts in a circuit designed for 3 V operation?

A: No. The OPA2172ID and OPA2172IDR require minimum 4.5 V supply voltage. A 3 V supply is insufficient. For 3 V operation, the OPA2171AQDRQ1 is the only available substitute, as it operates at minimum 2.7 V.

Q: What is the moisture sensitivity level (MSL) for each part?

A: The LT1673CS8#TRPBF carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The OPA2172ID and OPA2172IDR carry MSL 2 (1 Year), requiring storage in controlled humidity conditions for one year. The OPA2171AQDRQ1 carries MSL 3 (168 Hours), requiring more stringent moisture control for 168 hours after packaging. Verify your storage and handling procedures comply with the MSL requirements of your selected substitute.