LT1673CS8#PBF Equivalent & Substitute Parts

Part Overview

The LT1673CS8#PBF 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 device is classified as Active product status and is RoHS3 compliant. The LT1673CS8#PBF operates across a wide supply voltage range of 2.2 V to 36 V, making it suitable for battery-powered and industrial applications requiring low-power operation with minimal input bias current.

Substitute parts are necessary when the original LT1673CS8#PBF is unavailable, when alternative packaging formats are required, or when enhanced performance specifications are needed for specific application requirements while maintaining functional and mechanical compatibility.

Key Parameters

Parameter	LT1673CS8#PBF
Amplifier Type	General Purpose
Number of Circuits	2
Output Type	Rail-to-Rail
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply Span (Min)	2.2 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	0°C ~ 70°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

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

Mechanical Compatibility:

Package type: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Pin count and footprint equivalence

Functional Compatibility:

Amplifier type: General Purpose
Number of circuits: 2 (dual-channel configuration)
Output type: Rail-to-Rail
Supply voltage range overlap: Minimum 2.2 V to maximum 36 V

Regulatory Compliance:

RoHS3 compliance
REACH unaffected status
ECCN classification: EAR99

The substitute parts identified (OPA2171AQDRQ1, OPA2172ID, OPA2172IDR) share identical mechanical packaging and functional circuit configuration. All substitutes are dual-channel general purpose operational amplifiers in 8-SOIC packages with rail-to-rail output capability and RoHS3 compliance. Differences in electrical performance parameters (slew rate, gain bandwidth product, supply current, output current) do not preclude substitution but require application-level verification of performance adequacy.

Parameter Comparison

Parameter	LT1673CS8#PBF	OPA2171AQDRQ1	OPA2172ID	OPA2172IDR
Manufacturer	Analog Devices Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	2	2	2	2
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate	0.005 V/µs	1.5 V/µs	10 V/µs	10 V/µs
Gain Bandwidth Product	12 kHz	3 MHz	10 MHz	10 MHz
Current - Input Bias	25 pA	8 pA	8 pA	8 pA
Voltage - Input Offset	200 µV	250 µV	200 µV	200 µV
Current - Supply (x2 Channels)	1.9 µA	475 µA	1.6 mA	1.6 mA
Current - Output / Channel	1.5 mA	35 mA	75 mA	75 mA
Voltage - Supply Span (Min)	2.2 V	2.7 V	4.5 V	4.5 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	36 V
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and RoHS3 compliance, ensuring regulatory continuity with the original LT1673CS8#PBF. The mechanical compatibility across all substitutes is confirmed through identical 8-SOIC package specifications and surface mount mounting type.

OPA2171AQDRQ1 is qualified to AEC-Q100 automotive standards and operates across an extended temperature range of -40°C to 125°C, compared to the LT1673CS8#PBF operating range of 0°C to 70°C. This part is available in Cut Tape and Digi-Reel packaging formats. The OPA2171AQDRQ1 exhibits higher slew rate (1.5 V/µs) and gain bandwidth product (3 MHz) than the original part, with increased supply current consumption (475 µA) and output current capability (35 mA per channel).

OPA2172ID and OPA2172IDR are functionally identical dual-channel general purpose amplifiers with matching electrical specifications. Both provide 10 V/µs slew rate and 10 MHz gain bandwidth product. The OPA2172ID is supplied in Tube packaging, while the OPA2172IDR is supplied in Cut Tape and Digi-Reel format. Both operate across -40°C to 125°C temperature range and require minimum supply voltage of 4.5 V. Output current capability is 75 mA per channel with supply current of 1.6 mA across both channels.

Selection between substitutes depends on application requirements for operating temperature range, minimum supply voltage, output current capability, and packaging format availability.

Frequently Asked Questions (FAQ)

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

A: Yes, the OPA2172IDR is mechanically compatible with identical 8-SOIC package dimensions and pin configuration. However, the minimum supply voltage requirement of 4.5 V for the OPA2172IDR differs from the LT1673CS8#PBF minimum of 2.2 V. Applications operating below 4.5 V supply voltage require the OPA2171AQDRQ1 (2.7 V minimum) or the original LT1673CS8#PBF.

Q: What is the difference between OPA2172ID and OPA2172IDR?

A: The OPA2172ID and OPA2172IDR are electrically identical dual-channel general purpose amplifiers with matching performance specifications. The primary difference is packaging format: OPA2172ID is supplied in Tube packaging, while OPA2172IDR is supplied in Cut Tape and Digi-Reel format. Both are RoHS3 compliant and operate across -40°C to 125°C.

Q: Is the OPA2171AQDRQ1 suitable for applications requiring extended temperature operation?

A: Yes, the OPA2171AQDRQ1 operates across -40°C to 125°C, providing extended temperature range compared to the LT1673CS8#PBF (0°C to 70°C). The OPA2171AQDRQ1 is qualified to AEC-Q100 automotive standards. Minimum supply voltage for the OPA2171AQDRQ1 is 2.7 V, compatible with low-voltage applications.

Q: What are the key electrical differences between the LT1673CS8#PBF and OPA2172IDR?

A: The OPA2172IDR provides significantly higher slew rate (10 V/µs versus 0.005 V/µs), higher gain bandwidth product (10 MHz versus 12 kHz), and higher output current capability (75 mA per channel versus 1.5 mA). The OPA2172IDR requires minimum supply voltage of 4.5 V compared to 2.2 V for the LT1673CS8#PBF. Supply current consumption is higher for the OPA2172IDR (1.6 mA versus 1.9 µA).

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts (OPA2171AQDRQ1, OPA2172ID, OPA2172IDR) are RoHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original LT1673CS8#PBF.

Q: What packaging options are available for substitute parts?

A: OPA2171AQDRQ1 is available in Cut Tape and Digi-Reel format. OPA2172ID is available in Tube packaging. OPA2172IDR is available in Cut Tape and Digi-Reel format. The original LT1673CS8#PBF is supplied in Tube packaging.

Q: Can the LT1673CS8#PBF be used in applications requiring output current greater than 1.5 mA per channel?

A: No, the LT1673CS8#PBF is limited to 1.5 mA output current per channel. Applications requiring higher output current (35 mA or 75 mA per channel) require the OPA2171AQDRQ1 or OPA2172 series respectively.

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