LT1885CS#PBF Equivalent & Substitute Parts

Part Overview

The LT1885CS#PBF is a general purpose operational amplifier manufactured by Analog Devices Inc., featuring four independent circuits in a 14-SOIC surface mount package. This rail-to-rail amplifier operates across a wide supply voltage range of 2.7 V to 36 V and is designed for applications requiring low input offset voltage and moderate bandwidth performance. The device is currently active in production with RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be achieved within the specified parameter ranges, allowing for design flexibility, inventory optimization, or supply chain continuity.

Key Parameters

Parameter	LT1885CS#PBF	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	1	V/µs
Gain Bandwidth Product	2.2	MHz
Current - Input Bias	150	pA
Voltage - Input Offset	30	µV
Current - Supply (x4 Channels)	850	µA
Current - Output / Channel	50	mA
Voltage - Supply Span (Min)	2.7	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	—

Substitute Part Grouping Explanation

Substitute parts for the LT1885CS#PBF are selected based on the following critical parameters:

Mechanical Compatibility:

Package type: 14-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Pin count and footprint equivalence

Electrical Compatibility:

Number of circuits: 4 independent amplifiers
Output type: Rail-to-Rail configuration
Supply voltage range: Minimum 2.7 V to maximum 36 V
Current output per channel: 50 mA or greater
Operating temperature range: Minimum 0°C or lower, maximum 70°C or higher

Regulatory Compliance:

RoHS3 compliance
REACH unaffected status
ECCN EAR99 classification

Substitute parts are grouped into functional categories based on amplifier type (General Purpose, Zero-Drift, Audio, J-FET) while maintaining the core mechanical and electrical compatibility requirements. Parts that exceed the minimum performance specifications in bandwidth, slew rate, or input bias current are acceptable substitutes provided they maintain the required supply voltage range and output current capability.

Parameter Comparison

Parameter	LT1885CS#PBF	OPA4171AID	OPA4171AIDR	OPA4188AID	OPA4188AIDR	OPA4241UA	OPA4241UA/2K5	Unit
Manufacturer	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	—
Amplifier Type	General Purpose	General Purpose	General Purpose	Zero-Drift	Zero-Drift	General Purpose	General Purpose	—
Number of Circuits	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	—
Slew Rate	1	1.5	1.5	0.8	0.8	0.01	0.01	V/µs
Gain Bandwidth Product	2.2	3	3	2	2	0.035	0.035	MHz
Current - Input Bias	150	8	8	160	160	4000	4000	pA
Voltage - Input Offset	30	250	250	6	6	50	50	µV
Current - Supply (x4 Channels)	850	475	475	415	415	25	25	µA
Current - Output / Channel	50	35	35	18	18	50	50	mA
Voltage - Supply Span (Min)	2.7	2.7	2.7	4	4	2.7	2.7	V
Voltage - Supply Span (Max)	36	36	36	36	36	36	36	V
Operating Temperature	0 to 70	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 85	-40 to 85	°C
Package / Case	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	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

OPA4171AID and OPA4171AIDR (General Purpose Category)

The OPA4171 series from Texas Instruments provides general purpose amplification with electrical characteristics closely aligned to the LT1885CS#PBF. Both variants maintain the 2.7 V minimum supply voltage, 36 V maximum supply voltage, and 14-SOIC package format. The OPA4171AIDR variant is available in tape and reel packaging, offering higher inventory availability (71,766 units) compared to the tube-packaged OPA4171AID (1,457 units). Both variants are RoHS3 compliant and REACH unaffected. The extended operating temperature range (-40°C to 125°C) exceeds the LT1885CS#PBF specification, providing additional design margin for temperature-sensitive applications.

OPA4188AID and OPA4188AIDR (Zero-Drift Category)

The OPA4188 series offers zero-drift amplification with superior input offset voltage performance (6 µV versus 30 µV). This device is suitable for applications requiring precision DC measurements or low-offset signal conditioning. The minimum supply voltage is 4 V, which restricts use in designs requiring operation below 4 V. The OPA4188AIDR variant provides significantly higher inventory (32,045 units) in tape and reel format. Both variants maintain RoHS3 compliance and the 14-SOIC package footprint.

OPA4241UA and OPA4241UA/2K5 (microPOWER Category)

The OPA4241 series is optimized for ultra-low power consumption (25 µA total supply current) and is suitable for battery-powered or energy-constrained applications. The trade-off is reduced bandwidth (35 kHz) and slew rate (0.01 V/µs), limiting use to low-frequency signal processing. Both variants maintain 2.7 V minimum supply voltage and 14-SOIC package compatibility. The OPA4241UA/2K5 variant is available in tape and reel format with 881 units in stock.

Packaging Considerations

The LT1885CS#PBF is supplied in tube packaging. Substitute parts are available in both tube and tape & reel formats. Tape & reel variants (AIDR suffix) typically offer higher inventory availability and are suitable for automated assembly processes. Tube-packaged variants are appropriate for manual assembly or lower-volume production.

Compliance and Regulatory Status

All substitute parts listed maintain RoHS3 compliance and REACH unaffected status, ensuring compatibility with current environmental and regulatory requirements. All parts are classified as ECCN EAR99 and HTSUS 8542.33.0001, consistent with the original part classification.

Frequently Asked Questions (FAQ)

Q: Can the OPA4171 series directly replace the LT1885CS#PBF in all applications?

A: The OPA4171 series maintains mechanical and electrical compatibility within the specified parameter ranges. The 14-SOIC package footprint is identical, and the supply voltage range (2.7 V to 36 V) matches the original part. However, the OPA4171 exhibits lower input bias current (8 pA versus 150 pA) and higher input offset voltage (250 µV versus 30 µV). Applications sensitive to input offset voltage should evaluate the OPA4188 series instead.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging contains components in a plastic tube suitable for manual handling and lower-volume assembly. Tape & reel packaging (TR or CT & Digi-Reel format) winds components on a continuous tape for automated pick-and-place assembly equipment. Both formats contain identical die and electrical performance; the difference is in handling and assembly methodology.

Q: Why does the OPA4241 have such low bandwidth compared to the LT1885CS#PBF?

A: The OPA4241 is designed for ultra-low power consumption (25 µA versus 850 µA). The reduced bandwidth (35 kHz versus 2.2 MHz) is a direct result of the power optimization design. This device is suitable only for DC and very low-frequency AC applications such as sensor signal conditioning or battery monitoring.

Q: Is the OPA4188 a direct substitute for precision applications?

A: The OPA4188 offers superior input offset voltage (6 µV versus 30 µV) and is classified as a zero-drift amplifier. However, the minimum supply voltage is 4 V, which restricts use in designs operating below 4 V. The slew rate is also lower (0.8 V/µs versus 1 V/µs). Verify that your application can tolerate these parameter differences before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance and REACH unaffected status, consistent with the LT1885CS#PBF regulatory classification.

Q: What is the significance of the OPA4171AQDRQ1 variant?

A: The OPA4171AQDRQ1 is an automotive-grade variant qualified to AEC-Q100 standards. This variant is suitable for automotive and harsh-environment applications requiring extended temperature operation (-40°C to 125°C) and automotive-specific reliability testing. The minimum supply voltage for this variant is 4.5 V, which differs from the standard OPA4171 series (2.7 V minimum).

Q: Can I use the OPA4140 series as a substitute?

A: The OPA4140 is a J-FET amplifier with different electrical characteristics (20 V/µs slew rate, 11 MHz bandwidth, 0.5 pA input bias current). While it maintains the 14-SOIC package and 2.7 V to 36 V supply range, the J-FET input stage provides significantly different performance. The OPA4140 is suitable for applications requiring extremely low input bias current but not as a direct general-purpose substitute.

Q: What inventory levels are available for each substitute?

A: Inventory availability varies by part number and packaging format. The OPA4171AIDR offers the highest availability (71,766 units), followed by OPA4188AIDR (32,045 units). Tube-packaged variants typically have lower inventory. Verify current stock levels with your supplier before design commitment.

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