LT1124AMPS8#PBF Equivalent & Substitute Parts

Part Overview

The LT1124AMPS8#PBF 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 LT1124AMPS8#PBF operates across a wide supply voltage range of 8V to 44V with a slew rate of 4.5V/µs and gain bandwidth product of 12.5 MHz, making it suitable for general purpose amplification applications requiring moderate performance characteristics.

Substitute parts become necessary when the primary part experiences supply constraints, when design requirements demand alternative performance specifications, or when manufacturing transitions require component qualification changes. The substitute parts listed maintain functional equivalence through matching package geometry, circuit count, and core amplification characteristics while offering variations in performance parameters and supply voltage ranges.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	-
Number of Circuits	2	-
Package / Case	8-SOIC (0.154", 3.90mm Width)	-
Mounting Type	Surface Mount	-
Slew Rate	4.5	V/µs
Gain Bandwidth Product	12.5	MHz
Current - Input Bias	7	nA
Voltage - Input Offset	20	µV
Current - Supply	2.3 (x2 Channels)	mA
Voltage - Supply Span (Min)	8	V
Voltage - Supply Span (Max)	44	V
Operating Temperature	-55°C ~ 125°C	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution eligibility for the LT1124AMPS8#PBF is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Circuit Configuration: All substitute parts must contain exactly 2 circuits to maintain functional equivalence in dual-channel applications.

Amplifier Classification: Substitute parts must be classified as either General Purpose or Audio amplifier types, as these categories share compatible application domains and signal processing characteristics.

Supply Voltage Range: Substitute parts must support a minimum supply voltage of 5V or lower and a maximum supply voltage of 32V or higher to ensure operation within typical system power budgets. The LT1124AMPS8#PBF operates from 8V to 44V; substitutes with overlapping or extended ranges are acceptable.

Operating Temperature Range: Substitute parts must support the extended industrial temperature range of -55°C to 125°C or a subset thereof to maintain reliability across specified operating conditions.

Compliance Standards: All substitute parts must maintain RoHS3 compliance and REACH unaffected status to satisfy regulatory and environmental requirements.

Parameter Comparison

Parameter	LT1124AMPS8#PBF	LM258DG4	LM258DRG4	LME49860MAX/NOPB	OPA2227U	OPA2277MDTEP
Manufacturer	Analog Devices Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Active	Obsolete	Discontinued at DiGi Electronics	Active	Active	Active
Amplifier Type	General Purpose	General Purpose	General Purpose	Audio	General Purpose	General Purpose
Number of Circuits	2	2	2	2	2	2
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)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate (V/µs)	4.5	0.3	0.3	20	2.3	0.8
Gain Bandwidth Product (MHz)	12.5	1.1	0.7	55	8	1
Current - Input Bias (nA)	7	20	20	10	2.5	0.5
Voltage - Input Offset (µV)	20	3000	3000	140	5	20
Current - Supply (mA, x2 Channels)	2.3	0.5	0.5	10.5	3.7	0.79
Voltage - Supply Span (Min)	8 V	3 V	3 V	5 V	5 V	4 V
Voltage - Supply Span (Max)	44 V	32 V	32 V	44 V	36 V	36 V
Operating Temperature	-55°C ~ 125°C	-25°C ~ 85°C	-25°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	3 (168 Hours)

Engineering Selection Recommendations

OPA2277MDTEP is the primary substitute for applications requiring extended operating temperature range (-55°C to 125°C) matching the LT1124AMPS8#PBF. This part maintains Active product status, RoHS3 compliance, and identical package specifications. The OPA2277MDTEP exhibits lower input bias current (0.5 nA) and reduced supply current (0.79 mA per dual channels) compared to the LT1124AMPS8#PBF, making it suitable for low-power applications. However, the slew rate (0.8 V/µs) and gain bandwidth product (1 MHz) are reduced, requiring verification for time-critical signal processing applications.

OPA2227U serves as an alternative for applications operating within the -40°C to 85°C temperature range. This part maintains Active status and offers improved input offset voltage (5 µV) and lower input bias current (2.5 nA) relative to the LT1124AMPS8#PBF. The slew rate (2.3 V/µs) and gain bandwidth product (8 MHz) provide moderate performance suitable for general purpose amplification. Moisture sensitivity level MSL 2 requires controlled storage conditions.

LME49860MAX/NOPB is classified as an Audio amplifier and provides the highest performance specifications with slew rate of 20 V/µs and gain bandwidth product of 55 MHz. This part maintains Active status and supports the full supply voltage range (5V to 44V) of the LT1124AMPS8#PBF. The elevated supply current (10.5 mA per dual channels) and operating temperature range (-40°C to 85°C) restrict its application to audio-specific designs with adequate power budgets and moderate temperature requirements.

LM258DRG4 and LM258DG4 are not recommended for new designs. Both parts exhibit Obsolete or Discontinued product status, limiting long-term supply availability. The reduced slew rate (0.3 V/µs) and gain bandwidth product (0.7 to 1.1 MHz) further restrict their application scope. Operating temperature range (-25°C to 85°C) does not support extended industrial specifications.

Frequently Asked Questions (FAQ)

Q: Can the LM258DRG4 or LM258DG4 be used as direct replacements for the LT1124AMPS8#PBF?

A: These parts share identical package geometry (8-SOIC) and circuit configuration (2 circuits), but are not recommended for new designs. Both parts have Obsolete or Discontinued product status, creating supply chain risk. Additionally, the reduced slew rate (0.3 V/µs versus 4.5 V/µs) and gain bandwidth product (0.7-1.1 MHz versus 12.5 MHz) result in significantly lower performance. The operating temperature range (-25°C to 85°C) does not support the extended industrial specification (-55°C to 125°C) of the LT1124AMPS8#PBF.

Q: What is the primary difference between the OPA2227U and OPA2277MDTEP?

A: Both parts are general purpose dual-channel operational amplifiers in 8-SOIC packages with Active product status. The OPA2277MDTEP supports the extended operating temperature range (-55°C to 125°C) matching the LT1124AMPS8#PBF, while the OPA2227U operates from -40°C to 85°C. The OPA2277MDTEP exhibits lower input bias current (0.5 nA) and reduced supply current (0.79 mA per dual channels), but provides lower slew rate (0.8 V/µs) and gain bandwidth product (1 MHz). The OPA2227U offers higher slew rate (2.3 V/µs) and gain bandwidth product (8 MHz) with slightly elevated supply current (3.7 mA per dual channels).

Q: Is the LME49860MAX/NOPB suitable for general purpose amplification applications?

A: The LME49860MAX/NOPB is classified as an Audio amplifier rather than a general purpose amplifier. While it shares the 8-SOIC package and dual-circuit configuration, its design optimization targets audio signal processing. The elevated slew rate (20 V/µs) and gain bandwidth product (55 MHz) exceed general purpose requirements, and the supply current (10.5 mA per dual channels) is significantly higher than the LT1124AMPS8#PBF (2.3 mA per dual channels). This part is appropriate for audio-specific designs with adequate power budgets.

Q: What packaging formats are available for these substitute parts?

A: All substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical compatibility with existing PCB layouts. Packaging options vary by supplier: LM258DRG4 is supplied in Cut Tape (CT) format, LME49860MAX/NOPB is available in Cut Tape (CT) and Digi-Reel® formats, while LM258DG4 and OPA2227U are supplied in Tube format. The OPA2277MDTEP packaging format is not specified in available documentation.

Q: Which substitute part best matches the operating temperature range of the LT1124AMPS8#PBF?

A: The OPA2277MDTEP is the only substitute part supporting the full extended operating temperature range of -55°C to 125°C, matching the LT1124AMPS8#PBF specification. All other substitute parts operate within narrower temperature ranges: LME49860MAX/NOPB and OPA2227U support -40°C to 85°C, while LM258DRG4 and LM258DG4 support only -25°C to 85°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed maintain RoHS3 compliance and REACH unaffected status, satisfying regulatory and environmental requirements equivalent to the LT1124AMPS8#PBF.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: The LT1124AMPS8#PBF, LM258DRG4, LM258DG4, and LME49860MAX/NOPB all have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. The OPA2227U has MSL 2 (1 Year), requiring controlled storage conditions for up to one year. The OPA2277MDTEP has MSL 3 (168 Hours), requiring more stringent moisture control with a 168-hour shelf life limit. Higher MSL ratings impose additional handling and storage requirements.

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