LT1674CS#TRPBF Equivalent & Substitute Parts

Part Overview

The LT1674CS#TRPBF is a general purpose operational amplifier manufactured by Analog Devices Inc., configured as a 4-circuit rail-to-rail amplifier in a 14-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LT1674CS#TRPBF operates across a wide supply voltage range of 2.2 V to 36 V and is suitable for low-power applications requiring minimal input bias current and low supply current consumption.

Alternative equivalent and substitute parts are necessary due to the Last Time Buy status of the LT1674CS#TRPBF. Identifying compatible replacements ensures design continuity and long-term component availability for production and maintenance applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Package / Case	14-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 LT1674CS#TRPBF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Number of Circuits: 4
Output Type: Rail-to-Rail
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply Span (Min): 2.2 V minimum
Voltage - Supply Span (Max): 36 V maximum
RoHS Status: ROHS3 Compliant

Substitute Parts are organized into two categories:

Category 1: Manufacturer Recommended Substitute The LT1496CS#TRPBF from Analog Devices Inc. meets all mandatory compatibility criteria and maintains the same supply voltage range (2.2 V to 36 V), package configuration, and operating temperature range. This part is classified as Active product status, ensuring continued availability.

Category 2: Similar Functional Alternatives The OP484 series (OP484ESZ, OP484ESZ-REEL, OP484FSZ, OP484FSZ-REEL, OP484FSZ-REEL7) and OPA4171AQDRQ1 satisfy all mandatory compatibility criteria. These parts feature identical package and circuit count specifications but exhibit different electrical performance characteristics, including higher slew rates, gain bandwidth products, and output current capabilities. The OPA4171AQDRQ1 includes automotive qualification (AEC-Q100) and operates across an extended temperature range (-40°C to 125°C).

Parameter Comparison

Parameter	LT1674CS#TRPBF	LT1496CS#TRPBF	OP484ESZ	OP484ESZ-REEL	OP484FSZ	OP484FSZ-REEL	OP484FSZ-REEL7	OPA4171AQDRQ1
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments
Number of Circuits	4	4	4	4	4	4	4	4
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	0.005	0.001	4	4	4	4	4	1.5
Gain Bandwidth Product (kHz/MHz)	12 kHz	2.7 kHz	4.25 MHz	4.25 MHz	4.25 MHz	4.25 MHz	4.25 MHz	3 MHz
Current - Input Bias (pA/nA)	25 pA	250 pA	80 nA	80 nA	80 nA	80 nA	80 nA	8 pA
Voltage - Input Offset (µV)	200	200	150	150	250	250	250	250
Current - Output / Channel (mA)	1.5	1.5	10	10	10	10	10	35
Voltage - Supply Span (Min)	2.2 V	2.2 V	3 V	3 V	3 V	3 V	3 V	4.5 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: LT1496CS#TRPBF

The LT1496CS#TRPBF is the manufacturer-recommended substitute for the LT1674CS#TRPBF. Both devices are manufactured by Analog Devices Inc. and share identical package specifications, circuit count, and supply voltage range. The LT1496CS#TRPBF is classified as Active product status, ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and identical moisture sensitivity levels. The LT1496CS#TRPBF is suitable for direct replacement in existing designs without PCB modifications.

Secondary Alternatives: OP484 Series

The OP484ESZ, OP484ESZ-REEL, OP484FSZ, OP484FSZ-REEL, and OP484FSZ-REEL7 are functionally compatible alternatives from Analog Devices Inc. These parts maintain identical package and circuit configurations but feature significantly enhanced electrical performance characteristics, including higher slew rates (4 V/µs), higher gain bandwidth products (4.25 MHz), and increased output current capability (10 mA per channel). These devices operate across an extended temperature range (-40°C to 125°C) and are classified as Active products. Selection of OP484 variants is appropriate for applications requiring improved dynamic performance or extended operating temperature specifications.

Automotive-Grade Alternative: OPA4171AQDRQ1

The OPA4171AQDRQ1 from Texas Instruments is a functionally compatible alternative with automotive qualification (AEC-Q100) and extended temperature range (-40°C to 125°C). This device features enhanced performance specifications including higher slew rate (1.5 V/µs), higher gain bandwidth product (3 MHz), and significantly higher output current capability (35 mA per channel). The OPA4171AQDRQ1 requires a minimum supply voltage of 4.5 V, which is higher than the LT1674CS#TRPBF minimum of 2.2 V. Selection of the OPA4171AQDRQ1 is appropriate for automotive applications or designs requiring automotive-grade component qualification.

Frequently Asked Questions (FAQ)

Q: Can the LT1496CS#TRPBF be used as a direct replacement for the LT1674CS#TRPBF?

A: Yes. The LT1496CS#TRPBF is the manufacturer-recommended substitute. Both devices share identical package specifications (14-SOIC), circuit count (4), output type (rail-to-rail), and supply voltage range (2.2 V to 36 V). No PCB modifications are required for substitution.

Q: What are the key differences between the LT1674CS#TRPBF and the OP484 series?

A: The primary differences are electrical performance and operating temperature range. The OP484 series features higher slew rate (4 V/µs versus 0.005 V/µs), higher gain bandwidth product (4.25 MHz versus 12 kHz), higher input bias current (80 nA versus 25 pA), and higher output current per channel (10 mA versus 1.5 mA). The OP484 series operates across -40°C to 125°C, compared to 0°C to 70°C for the LT1674CS#TRPBF. Package and circuit count remain identical.

Q: Is the OPA4171AQDRQ1 compatible with designs using the LT1674CS#TRPBF?

A: The OPA4171AQDRQ1 is package and circuit-count compatible but has a higher minimum supply voltage requirement (4.5 V versus 2.2 V). Designs operating at supply voltages below 4.5 V cannot use the OPA4171AQDRQ1. For designs with supply voltages of 4.5 V or higher, the OPA4171AQDRQ1 is functionally compatible and offers enhanced performance and automotive qualification.

Q: What is the difference between OP484ESZ and OP484FSZ?

A: Both devices are electrically identical with the same slew rate (4 V/µs), gain bandwidth product (4.25 MHz), and output current capability (10 mA per channel). The primary difference is voltage input offset specification: OP484ESZ specifies 150 µV maximum, while OP484FSZ specifies 250 µV maximum. Both are classified as Active products and are suitable for general purpose applications.

Q: What packaging options are available for the OP484 series?

A: The OP484 series is available in multiple packaging configurations: OP484ESZ (Tube), OP484ESZ-REEL (Cut Tape & Digi-Reel), OP484FSZ (Tube), OP484FSZ-REEL (standard reel), and OP484FSZ-REEL7 (7-inch reel). All variants use identical 14-SOIC package and are electrically equivalent within their respective input offset specifications.

Q: Why does the LT1674CS#TRPBF have a Last Time Buy status?

A: Last Time Buy status indicates that the manufacturer has discontinued production of this device. Existing inventory is available for purchase, but no future production is planned. This status necessitates identification of equivalent substitute parts for long-term design continuity and component availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (LT1496CS#TRPBF, OP484 series, and OPA4171AQDRQ1) are ROHS3 compliant, matching the compliance status of the LT1674CS#TRPBF.

Q: What is the moisture sensitivity level difference between the LT1674CS#TRPBF and the OP484 series?

A: The LT1674CS#TRPBF has MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The OP484 series has MSL 3 (168 Hours), requiring controlled storage and handling conditions. This difference may impact component storage, handling procedures, and shelf-life management in manufacturing environments.

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