LT1674CS#PBF Equivalent & Substitute Parts

Part Overview

The LT1674CS#PBF is a general purpose operational amplifier integrated circuit manufactured by Analog Devices Inc., configured as a 4-circuit rail-to-rail amplifier in a 14-SO surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements for applications utilizing this amplifier topology.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	0.005	V/µs
Gain Bandwidth Product	12	kHz
Current - Input Bias	25	pA
Voltage - Input Offset	200	µV
Current - Supply (x4 Channels)	1.9	µA
Current - Output / Channel	1.5	mA
Voltage - Supply Span (Min)	2.2	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LT1674CS#PBF is determined by the following critical parameters: 4-circuit configuration, rail-to-rail output topology, 14-SOIC surface mount package, and supply voltage range compatibility (2.2 V to 36 V minimum). The substitute parts are grouped into two categories based on electrical performance characteristics:

Category 1: Direct Manufacturer Equivalent (Analog Devices LT Series) The LT1496CS#PBF represents the manufacturer-recommended equivalent, maintaining identical package geometry, pin configuration, and supply voltage specifications. This part is Active status with higher inventory availability.

Category 2: Performance-Enhanced Alternatives (Analog Devices OP484 Series and Texas Instruments OPA4171AQDRQ1) These parts maintain the 4-circuit, rail-to-rail, 14-SOIC package configuration and 36 V maximum supply voltage. However, they exhibit significantly higher slew rates, gain bandwidth products, and output current capabilities. These alternatives are suitable for applications where the LT1674CS#PBF performance envelope is insufficient but package and basic topology requirements remain constant.

Parameter Comparison

Parameter	LT1674CS#PBF	LT1496CS#PBF	OP484ESZ	OP484ESZ-REEL	OP484FSZ	OP484FSZ-REEL	OP484FSZ-REEL7	OPA4171AQDRQ1
Manufacturer	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	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 (V)	2.2	2.2	3	3	3	3	3	4.5
Voltage - Supply Span Max (V)	36	36	36	36	36	36	36	36
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 125
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
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

LT1496CS#PBF (Manufacturer-Recommended Equivalent) The LT1496CS#PBF is the primary substitute for the LT1674CS#PBF. Both devices are manufactured by Analog Devices, share identical package specifications (14-SOIC), and maintain compatible supply voltage ranges (2.2 V to 36 V). The LT1496CS#PBF is Active status with 1225 units in stock, ensuring supply continuity. This part is suitable for direct replacement in existing designs without circuit modification. Both parts are ROHS3 compliant with MSL 1 rating.

OP484 Series (OP484ESZ, OP484ESZ-REEL, OP484FSZ, OP484FSZ-REEL, OP484FSZ-REEL7) The OP484 series represents performance-enhanced alternatives manufactured by Analog Devices. These parts maintain the 4-circuit, rail-to-rail, 14-SOIC configuration and 36 V maximum supply voltage. However, the minimum supply voltage is 3 V (versus 2.2 V for the LT1674CS#PBF), which may restrict use in ultra-low-voltage applications. The OP484 series exhibits significantly higher slew rates (4 V/µs), gain bandwidth products (4.25 MHz), and output current capabilities (10 mA per channel). All OP484 variants are Active status with substantial inventory availability. These parts are suitable for applications requiring higher bandwidth and output drive capability within the 3 V to 36 V supply range.

OPA4171AQDRQ1 (Texas Instruments Alternative) The OPA4171AQDRQ1 is a cross-manufacturer alternative from Texas Instruments, maintaining the 4-circuit, rail-to-rail, 14-SOIC package configuration. This part is qualified to AEC-Q100 automotive standards and carries Automotive grade designation. The minimum supply voltage is 4.5 V, restricting use in applications below this threshold. The OPA4171AQDRQ1 exhibits higher slew rate (1.5 V/µs), gain bandwidth product (3 MHz), and significantly higher output current capability (35 mA per channel) compared to the LT1674CS#PBF. This part is Active status with 27800 units in stock. Selection of the OPA4171AQDRQ1 is appropriate for automotive-qualified designs or applications requiring higher output current within the 4.5 V to 36 V supply range.

Frequently Asked Questions (FAQ)

Q: Can the LT1496CS#PBF directly replace the LT1674CS#PBF without circuit modification? A: Yes. Both parts share identical package geometry (14-SOIC), pin configuration, and supply voltage specifications (2.2 V to 36 V). The LT1496CS#PBF is the manufacturer-recommended equivalent and requires no circuit changes for direct substitution.

Q: What are the key differences between the LT1674CS#PBF and OP484 series? A: The primary differences are minimum supply voltage (2.2 V for LT1674CS#PBF versus 3 V for OP484 series), slew rate (0.005 V/µs versus 4 V/µs), gain bandwidth product (12 kHz versus 4.25 MHz), and output current per channel (1.5 mA versus 10 mA). The OP484 series is suitable for applications requiring higher bandwidth and output drive capability.

Q: Is the OPA4171AQDRQ1 suitable for all applications using the LT1674CS#PBF? A: No. The OPA4171AQDRQ1 requires a minimum supply voltage of 4.5 V, which exceeds the LT1674CS#PBF minimum of 2.2 V. Applications operating below 4.5 V supply voltage cannot use this part. Additionally, the OPA4171AQDRQ1 is automotive-qualified, which may introduce cost considerations for non-automotive applications.

Q: What is the significance of the packaging designations (Tube, Cut Tape & Digi-Reel)? A: Packaging designations indicate the physical form in which components are supplied. Tube packaging is standard reel format. Cut Tape & Digi-Reel packaging provides flexibility for both manual and automated assembly processes. The electrical specifications remain identical across packaging variants of the same part number.

Q: Can OP484FSZ and OP484ESZ be used interchangeably? A: Both OP484FSZ and OP484ESZ maintain identical electrical specifications, package geometry, and pin configuration. The primary difference is input offset voltage specification (250 µV for OP484FSZ versus 150 µV for OP484ESZ). Selection depends on application offset voltage requirements. Both are suitable for direct substitution in designs tolerating their respective offset specifications.

Q: What is the impact of the LT1674CS#PBF Last Time Buy status? A: Last Time Buy status indicates discontinued production with limited remaining inventory (853 units). This necessitates transition to alternative parts for new designs or long-term production requirements. The LT1496CS#PBF is the recommended transition path, offering Active status and higher inventory availability (1225 units).

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed (LT1496CS#PBF, OP484 series, and OPA4171AQDRQ1) are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements equivalent to the LT1674CS#PBF.

Q: What is the difference between MSL 1 and MSL 3 ratings? A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control requirements. MSL 3 indicates a 168-hour moisture exposure limit before soldering. The LT1674CS#PBF and LT1496CS#PBF carry MSL 1 rating, while OP484 series and OPA4171AQDRQ1 carry MSL 3 rating. MSL 3 parts require controlled storage and handling procedures.

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