LT1492CS8 Equivalent & Substitute Parts

Part Overview

The LT1492CS8 is a general-purpose operational amplifier manufactured by Analog Devices Inc., featuring dual circuits in an 8-SOIC surface mount package. This device is classified as Active product status and is ROHS3 compliant. The LT1492CS8 operates across a wide supply voltage range of 2.5V to 36V with a slew rate of 3V/µs and gain bandwidth product of 5 MHz, making it suitable for general-purpose amplification applications requiring moderate bandwidth and low input bias current.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when design specifications allow for components with comparable electrical characteristics and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Slew Rate	3	V/µs
Gain Bandwidth Product	5	MHz
Current - Input Bias	50	nA
Voltage - Input Offset	120	µV
Current - Supply (x2 Channels)	425	µA
Current - Output / Channel	55	mA
Voltage - Supply Span (Min)	2.5	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LT1492CS8 is determined by compatibility across the following critical parameters:

Mechanical Compatibility: All substitute parts must feature the same 8-SOIC surface mount package with 0.154" (3.90mm) width to ensure PCB footprint compatibility.

Electrical Compatibility: Substitute parts must operate within the supply voltage range of the primary application. The LT1492CS8 operates from 2.5V to 36V; substitute parts with minimum supply voltage requirements of 3V or higher are acceptable for applications using 3V or greater supply voltages. The dual-circuit configuration (2 circuits per package) is mandatory for direct substitution.

Performance Parameters: The slew rate (3V/µs), gain bandwidth product (5 MHz), input bias current (50 nA), and input offset voltage (120 µV) define the performance envelope. Substitute parts with lower slew rates, lower bandwidth, or higher input bias currents represent functional degradation but remain electrically compatible for applications not requiring the full performance specification of the primary part.

Packaging Format: The LT1492CS8 is supplied in tube packaging. Direct packaging equivalents (tube) and alternative packaging formats (cut tape, digi-reel) are both acceptable substitutes, as they contain identical die and electrical characteristics.

Compliance & Status: All substitute parts must maintain ROHS3 compliance and MSL rating of 1 to ensure environmental and moisture handling compatibility.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Status
LT1492CS8	Analog Devices Inc.	3	5	50	120	425	55	2.5	36	0 to 70	Active
LT1492CS8#PBF	Analog Devices Inc.	3	5	50	120	425	55	2.5	36	0 to 70	Active
LM258ADT	STMicroelectronics	0.6	1.1	20	1000	700	40	3	30	-40 to 105	Active
LM258DT	STMicroelectronics	0.6	1.1	20	5000	700	40	3	30	-40 to 105	Active
LM2904AYDT	STMicroelectronics	0.6	1.1	20	1000	700	40	3	30	-40 to 125	Active
LM2904DT	Rohm Semiconductor	0.3	0.7	20	1000	600	30	3	32	-40 to 125	Not For New Designs
LM2904YDT	STMicroelectronics	0.6	0.7	20	2000	700	30	3	30	-40 to 125	Active
LM358ADT	STMicroelectronics	0.6	1.1	20	1000	700	40	3	30	0 to 70	Active
LM358DT	Rohm Semiconductor	0.3	0.8	20	1000	600	30	3	32	-40 to 85	Obsolete
LM7372MR/NOPB	Texas Instruments	3000	120	2700	2000	13	260	9	36	-40 to 85	Active
LM7372MRX/NOPB	Texas Instruments	3000	120	2700	2000	13	260	9	36	-40 to 85	Active

Engineering Selection Recommendations

Direct Equivalent (Identical Electrical & Mechanical Specifications):

LT1492CS8#PBF is the direct equivalent of LT1492CS8, differing only in packaging format (tube versus cut tape). Both parts are manufactured by Analog Devices Inc., maintain Active product status, and are ROHS3 compliant with MSL rating of 1. Selection between these two is determined by supply chain availability and packaging requirements for assembly processes.

Functional Substitutes (Compatible Electrical Performance with Reduced Specifications):

LM258ADT, LM258DT, LM2904AYDT, and LM358ADT are functionally compatible substitutes for applications where the full performance envelope of the LT1492CS8 is not required. These parts maintain the dual-circuit configuration, 8-SOIC package format, and ROHS3 compliance. However, these substitutes exhibit reduced slew rate (0.6V/µs versus 3V/µs), lower gain bandwidth product (1.1 MHz versus 5 MHz), and higher input offset voltage (1000 µV to 5000 µV versus 120 µV). These parts are suitable for general-purpose amplification applications operating at 3V supply voltage or higher. LM258ADT and LM358ADT are recommended for new designs due to Active product status and automotive qualification (AEC-Q100).

Limited Substitutes (Degraded Performance, Not Recommended for New Designs):

LM2904DT and LM358DT are not recommended for new designs. LM2904DT carries "Not For New Designs" status, and LM358DT is classified as Obsolete. These parts exhibit significantly reduced performance with slew rates of 0.3V/µs and gain bandwidth products of 0.7 MHz to 0.8 MHz. Use of these parts is restricted to legacy system maintenance only.

Performance-Enhanced Alternatives (Not Direct Substitutes):

LM7372MR/NOPB and LM7372MRX/NOPB are voltage feedback amplifiers with substantially higher performance specifications (3000V/µs slew rate, 120 MHz gain bandwidth product). These parts are not direct substitutes due to different amplifier topology (voltage feedback versus general purpose), higher supply voltage requirement (9V minimum), and different electrical characteristics. These parts are suitable only for applications requiring significantly higher bandwidth and slew rate performance.

Frequently Asked Questions (FAQ)

Q: Can LM258ADT be used as a direct replacement for LT1492CS8 in existing designs?

A: LM258ADT is mechanically compatible (8-SOIC package) and electrically compatible for applications not requiring the full performance specification of the LT1492CS8. However, the reduced slew rate (0.6V/µs versus 3V/µs) and lower gain bandwidth product (1.1 MHz versus 5 MHz) may affect circuit performance in bandwidth-sensitive applications. Circuit validation is necessary to confirm functional equivalence for specific applications.

Q: What is the minimum supply voltage requirement for substitute parts?

A: The LT1492CS8 operates from 2.5V minimum supply voltage. Most substitute parts (LM258, LM2904, LM358 series) require 3V minimum supply voltage. Applications using 2.5V supply voltage cannot use these substitutes and must source the LT1492CS8 or equivalent parts with 2.5V minimum rating.

Q: Are the LM7372 series parts suitable substitutes for the LT1492CS8?

A: LM7372 series parts are not suitable direct substitutes. These are voltage feedback amplifiers with fundamentally different electrical characteristics, higher supply voltage requirements (9V minimum), and different amplifier topology. LM7372 parts are appropriate only for applications requiring significantly higher bandwidth (120 MHz) and slew rate (3000V/µs) performance.

Q: What is the difference between LT1492CS8 and LT1492CS8#PBF?

A: Both parts are electrically and mechanically identical. The difference is packaging format: LT1492CS8 is supplied in tube packaging, while LT1492CS8#PBF is supplied in cut tape (CT) and digi-reel format. Selection depends on assembly process requirements and supply chain availability.

Q: Can obsolete parts like LM358DT be used in new designs?

A: No. LM358DT is classified as Obsolete and LM2904DT is marked "Not For New Designs." These parts should be used only for maintenance and repair of existing systems. New designs must use parts with Active product status such as LM258ADT, LM2904AYDT, or LM358ADT.

Q: What are the key performance differences between the LT1492CS8 and LM258 series?

A: The LT1492CS8 provides superior performance with 3V/µs slew rate (versus 0.6V/µs), 5 MHz gain bandwidth product (versus 1.1 MHz), and lower input offset voltage (120 µV versus 1000-5000 µV). The LT1492CS8 also supports lower supply voltage operation (2.5V minimum versus 3V minimum). LM258 series parts are suitable for applications where this reduced performance is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring environmental and moisture handling compatibility with the LT1492CS8.

Q: What is the operating temperature range difference between LT1492CS8 and substitute parts?

A: The LT1492CS8 operates from 0°C to 70°C. Most substitute parts (LM258, LM2904, LM358 series) operate from -40°C to 105°C or -40°C to 125°C, providing extended low-temperature capability. Applications requiring operation below 0°C must use substitute parts with extended temperature range.

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