LT1124CS8 Equivalent & Substitute Parts

Part Overview

The LT1124CS8 is a general purpose operational amplifier integrated circuit manufactured by Analog Devices Inc. in the LT® series. This dual-channel amplifier is housed in an 8-SOIC surface mount package and operates across a wide supply voltage range of 8V to 44V. The device is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative sourcing strategies while maintaining functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Slew Rate	4.5	V/µs
Gain Bandwidth Product	12.5	MHz
Current - Input Bias	7	nA
Voltage - Input Offset	25	µV
Current - Supply	2.3 (x2 Channels)	mA
Voltage - Supply Span (Min)	8	V
Voltage - Supply Span (Max)	44	V
Operating Temperature	0 to 70	°C
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LT1124CS8 is determined by electrical and mechanical compatibility across the following critical parameters: amplifier type classification, number of circuits (dual-channel requirement), package form factor (8-SOIC surface mount), supply voltage range overlap, and operating temperature range. Substitute parts are grouped into two categories based on functional alignment:

Category 1: Direct Packaging Variants Parts sharing identical electrical specifications and packaging but differing only in supplier device package designation or tape/reel configuration. These include LT1124CS8#PBF.

Category 2: Functional Equivalents Parts with general purpose amplifier classification, dual-channel configuration, and 8-SOIC packaging that operate within overlapping supply voltage ranges. Substitution within this category requires verification that the application's specific electrical requirements (slew rate, gain bandwidth product, input bias current, input offset voltage, and supply current) are met by the substitute part's specifications. Parts in this category include MC4558CDT, MC4558IDT, and OPA2227MDREP.

Category 3: Alternative Amplifier Types Parts with different amplifier type classifications (J-FET, Audio) that maintain dual-channel, 8-SOIC configuration and overlapping supply voltage ranges. These include ADA4000-2ARZ variants and LME49860MAX/NOPB. Substitution in this category requires application-specific evaluation of amplifier type performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
LT1124CS8	Analog Devices Inc.	General Purpose	4.5	12.5	7	25	2.3	8	44	0 to 70	8-SOIC
LT1124CS8#PBF	Analog Devices Inc.	General Purpose	4.5	12.5	7	25	2.3	8	44	0 to 70	8-SOIC
ADA4000-2ARZ	Analog Devices Inc.	J-FET	20	5	0.005	200	1.35	8	36	-40 to 125	8-SOIC
ADA4000-2ARZ-R7	Analog Devices Inc.	J-FET	20	5	0.005	200	1.35	8	36	-40 to 125	8-SOIC
ADA4000-2ARZ-RL	Analog Devices Inc.	J-FET	20	5	0.005	200	1.35	8	36	-40 to 125	8-SOIC
LME49860MAX/NOPB	Texas Instruments	Audio	20	55	10	140	10.5	5	44	-40 to 85	8-SOIC
MC1458DT	STMicroelectronics	General Purpose	0.8	1	30	1000	2.3	5	30	0 to 70	8-SOIC
MC4558CDT	STMicroelectronics	General Purpose	2.2	5.5	50	1000	2.3	4	40	0 to 70	8-SOIC
MC4558IDT	STMicroelectronics	General Purpose	2.2	5.5	50	1000	2.3	4	40	-40 to 105	8-SOIC
OPA2227MDREP	Texas Instruments	General Purpose	2.3	8	2.5	5	3.7	5	36	-55 to 125	8-SOIC
OPA2277MDTEP	Texas Instruments	General Purpose	0.8	1	0.5	20	0.79	4	36	-55 to 125	8-SOIC

Engineering Selection Recommendations

Direct Substitution (Identical Specifications) LT1124CS8#PBF is a direct equivalent to LT1124CS8, differing only in packaging format (Tube versus standard). Both parts are manufactured by Analog Devices Inc., carry Active product status, and maintain ROHS3 compliance with MSL 1 rating. Selection between these variants is determined by procurement and assembly requirements.

General Purpose Amplifier Substitutes MC4558CDT and MC4558IDT are general purpose dual-channel amplifiers in 8-SOIC packaging manufactured by STMicroelectronics. Both maintain the 2.3 mA supply current specification and operate within overlapping supply voltage ranges (4V to 40V). MC4558IDT extends the operating temperature range to -40°C to 105°C compared to the LT1124CS8 specification of 0°C to 70°C. Both parts are ROHS3 compliant with MSL 1 rating and Active product status.

OPA2227MDREP is a general purpose dual-channel amplifier manufactured by Texas Instruments in 8-SOIC packaging. This part offers superior input offset voltage (5 µV versus 25 µV) and lower input bias current (2.5 nA versus 7 nA). Operating temperature range extends to -55°C to 125°C. OPA2227MDREP carries ROHS3 compliance but has MSL 3 rating (168 Hours) and Active product status.

Alternative Amplifier Type Substitutes ADA4000-2ARZ, ADA4000-2ARZ-R7, and ADA4000-2ARZ-RL are J-FET amplifiers manufactured by Analog Devices Inc. in 8-SOIC packaging. These parts feature significantly lower input bias current (5 pA versus 7 nA) and higher slew rate (20 V/µs versus 4.5 V/µs). Supply voltage maximum is limited to 36V compared to 44V for the LT1124CS8. Operating temperature range extends to -40°C to 125°C. All variants are ROHS3 compliant with MSL 1 rating and Active product status. Packaging variants differ: ADA4000-2ARZ uses Tube, ADA4000-2ARZ-R7 uses Cut Tape & Digi-Reel®, and ADA4000-2ARZ-RL uses unspecified packaging.

LME49860MAX/NOPB is an audio amplifier manufactured by Texas Instruments in 8-SOIC packaging. This part features the highest gain bandwidth product (55 MHz versus 12.5 MHz) and slew rate (20 V/µs versus 4.5 V/µs) among listed substitutes. Supply current is elevated at 10.5 mA. Operating temperature range is -40°C to 85°C. The part is ROHS3 compliant with MSL 1 rating and Active product status.

OPA2277MDTEP is a general purpose dual-channel amplifier manufactured by Texas Instruments in 8-SOIC packaging with the lowest supply current (0.79 mA) and slew rate (0.8 V/µs) among listed options. Operating temperature range extends to -55°C to 125°C. The part is ROHS3 compliant with MSL 3 rating (168 Hours) and Active product status.

Frequently Asked Questions (FAQ)

Q: Can LT1124CS8#PBF be used as a direct replacement for LT1124CS8? A: Yes. LT1124CS8#PBF is electrically and mechanically identical to LT1124CS8. The difference is packaging format: LT1124CS8#PBF is supplied in Tube packaging while LT1124CS8 uses standard packaging. Both parts are manufactured by Analog Devices Inc., carry Active product status, and are ROHS3 compliant with MSL 1 rating.

Q: What are the key differences between general purpose and J-FET amplifier substitutes? A: General purpose amplifiers (MC4558CDT, MC4558IDT, OPA2227MDREP, OPA2277MDTEP) and J-FET amplifiers (ADA4000-2ARZ variants) differ in input bias current and slew rate characteristics. J-FET amplifiers feature significantly lower input bias current (5 pA versus 7 nA to 50 nA) and higher slew rate (20 V/µs versus 0.8 V/µs to 4.5 V/µs). J-FET amplifiers are suitable for applications requiring extremely low input bias current. General purpose amplifiers offer broader supply voltage ranges and temperature operating ranges in some variants.

Q: Are all substitute parts available in 8-SOIC packaging? A: Yes. All listed substitute parts are housed in 8-SOIC (0.154", 3.90mm Width) surface mount packages, maintaining mechanical compatibility with LT1124CS8.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings? A: MSL ratings indicate moisture sensitivity during storage and handling. LT1124CS8 and most substitute parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. OPA2227MDREP and OPA2277MDTEP carry MSL 3 (168 Hours), requiring controlled storage conditions and bake-out procedures before reflow soldering.

Q: Which substitute parts support the full 44V maximum supply voltage of LT1124CS8? A: LT1124CS8#PBF, MC4558CDT, MC4558IDT, and LME49860MAX/NOPB support the full 44V maximum supply voltage. ADA4000-2ARZ variants are limited to 36V maximum. OPA2227MDREP and OPA2277MDTEP are limited to 36V maximum.

Q: Which substitute parts maintain the 0°C to 70°C operating temperature range of LT1124CS8? A: LT1124CS8#PBF, MC4558CDT, and MC1458DT maintain the 0°C to 70°C operating temperature range. All other substitute parts extend the operating temperature range to either -40°C or -55°C at the lower end, and to 85°C, 105°C, or 125°C at the upper end.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the environmental compliance of LT1124CS8.

Q: What is the difference between MC4558CDT and MC4558IDT? A: MC4558CDT and MC4558IDT are electrically identical general purpose dual-channel amplifiers manufactured by STMicroelectronics. The primary difference is operating temperature range: MC4558CDT operates from 0°C to 70°C, while MC4558IDT operates from -40°C to 105°C. Both are supplied in Cut Tape & Digi-Reel® packaging and are ROHS3 compliant with MSL 1 rating.

Q: What packaging format options are available for ADA4000-2ARZ? A: Three packaging variants of the ADA4000-2ARZ are listed: ADA4000-2ARZ (Tube), ADA4000-2ARZ-R7 (Cut Tape & Digi-Reel®), and ADA4000-2ARZ-RL (unspecified packaging). All three variants are electrically identical J-FET amplifiers with identical electrical specifications.

Q: Which substitute part offers the lowest input offset voltage? A: OPA2227MDREP offers the lowest input offset voltage at 5 µV, compared to 25 µV for LT1124CS8. This makes OPA2227MDREP suitable for precision applications requiring minimal offset voltage.

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