LT1885CS#TRPBF Equivalent & Substitute Parts

Part Overview

The LT1885CS#TRPBF is a general purpose operational amplifier manufactured by Analog Devices Inc., configured as a 4-circuit rail-to-rail integrated circuit in a 14-SOIC surface mount package. This device is classified as Active product status and is RoHS3 compliant. The LT1885CS#TRPBF serves applications requiring low-power, general-purpose amplification with moderate bandwidth and rail-to-rail output capability across a wide supply voltage range of 2.7 V to 36 V. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and functional equivalence to support design flexibility and supply chain continuity.

Key Parameters

Parameter	LT1885CS#TRPBF
Manufacturer	Analog Devices Inc.
Amplifier Type	General Purpose
Number of Circuits	4
Output Type	Rail-to-Rail
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	1 V/µs
Gain Bandwidth Product	2.2 MHz
Current - Input Bias	150 pA
Voltage - Input Offset	30 µV
Current - Supply	850 µA (x4 Channels)
Current - Output / Channel	50 mA
Voltage - Supply Span (Min)	2.7 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	0°C ~ 70°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the LT1885CS#TRPBF are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Number of Circuits: 4 (all substitutes maintain quad-channel configuration)
Output Type: Rail-to-Rail (all substitutes provide rail-to-rail output)
Package / Case: 14-SOIC (0.154", 3.90mm Width) (all substitutes use identical package)
Mounting Type: Surface Mount (all substitutes are surface mount)
Voltage - Supply Span: Minimum 2.7 V to Maximum 36 V (all substitutes support this range or broader)

Secondary Performance Parameters:

Slew Rate: 1 V/µs (baseline; substitutes range from 0.01 V/µs to 20 V/µs depending on application requirements)
Gain Bandwidth Product: 2.2 MHz (baseline; substitutes range from 35 kHz to 18 MHz)
Current - Input Bias: 150 pA (baseline; substitutes range from 0.5 pA to 4 nA)
Voltage - Input Offset: 30 µV (baseline; substitutes range from 6 µV to 500 µV)
Current - Supply: 850 µA per 4 channels (baseline; substitutes range from 25 µA to 2 mA per 4 channels)

Substitutes are grouped by amplifier type (General Purpose, Zero-Drift, Audio, J-FET) to facilitate selection based on specific application requirements while maintaining package and pin compatibility.

Parameter Comparison

Parameter	LT1885CS#TRPBF	OPA4171AID	OPA4171AIDR	OPA4171AQDRQ1	OPA4188AID	OPA4188AIDR	OPA4241UA	OPA4241UA/2K5	OPA4140AIDR	OPA1654AID	OPA1654AIDR
Manufacturer	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	Zero-Drift	Zero-Drift	General Purpose	General Purpose	J-FET	Audio	Audio
Number of Circuits	4	4	4	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	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Package / Case	14-SOIC	14-SOIC	14-SOIC	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	Surface Mount	Surface Mount	Surface Mount
Slew Rate	1 V/µs	1.5 V/µs	1.5 V/µs	1.5 V/µs	0.8 V/µs	0.8 V/µs	0.01 V/µs	0.01 V/µs	20 V/µs	10 V/µs	10 V/µs
Gain Bandwidth Product	2.2 MHz	3 MHz	3 MHz	3 MHz	2 MHz	2 MHz	35 kHz	35 kHz	11 MHz	18 MHz	18 MHz
Current - Input Bias	150 pA	8 pA	8 pA	8 pA	160 pA	160 pA	4 nA	4 nA	0.5 pA	10 pA	10 pA
Voltage - Input Offset	30 µV	250 µV	250 µV	250 µV	6 µV	6 µV	50 µV	50 µV	30 µV	500 µV	500 µV
Current - Supply (x4 Channels)	850 µA	475 µA	475 µA	475 µA	415 µA	415 µA	25 µA	25 µA	1.8 mA	2 mA	2 mA
Current - Output / Channel	50 mA	35 mA	35 mA	35 mA	18 mA	18 mA	50 mA	50 mA	36 mA	50 mA	50 mA
Voltage - Supply Span (Min)	2.7 V	2.7 V	2.7 V	4.5 V	4 V	4 V	2.7 V	2.7 V	4.5 V	4.5 V	4.5 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V	36 V
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

General Purpose Amplifier Substitutes (OPA4171 Series)

The OPA4171AID, OPA4171AIDR, and OPA4171AQDRQ1 are general purpose amplifiers that maintain functional equivalence to the LT1885CS#TRPBF. All three variants share identical electrical specifications with slew rate of 1.5 V/µs and gain bandwidth product of 3 MHz, representing marginal performance improvements over the LT1885CS#TRPBF. The OPA4171AID and OPA4171AIDR support the full 2.7 V minimum supply voltage, while OPA4171AQDRQ1 requires 4.5 V minimum and includes automotive-grade qualification (AEC-Q100). All OPA4171 variants support extended operating temperature range of -40°C to 125°C compared to the LT1885CS#TRPBF range of 0°C to 70°C. All are RoHS3 compliant and Active product status.

Zero-Drift Amplifier Substitutes (OPA4188 Series)

The OPA4188AID and OPA4188AIDR are zero-drift amplifiers offering superior input offset voltage of 6 µV compared to 30 µV of the LT1885CS#TRPBF. These devices feature lower supply current of 415 µA per 4 channels versus 850 µA, and reduced output current capability of 18 mA per channel versus 50 mA. The OPA4188 series requires minimum supply voltage of 4 V and supports extended operating temperature range of -40°C to 125°C. Both are RoHS3 compliant and Active product status.

Micropower Amplifier Substitutes (OPA4241 Series)

The OPA4241UA and OPA4241UA/2K5 are micropower general purpose amplifiers with extremely low supply current of 25 µA per 4 channels. These devices are suitable for ultra-low-power applications but feature significantly reduced bandwidth (35 kHz gain bandwidth product) and slew rate (0.01 V/µs). Both support 2.7 V minimum supply voltage and maintain 50 mA output current per channel. Operating temperature range is -40°C to 85°C. Both are RoHS3 compliant and Active product status.

J-FET Amplifier Substitute (OPA4140AIDR)

The OPA4140AIDR is a J-FET amplifier featuring extremely low input bias current of 0.5 pA and high slew rate of 20 V/µs. This device requires minimum supply voltage of 4.5 V and provides 36 mA output current per channel. Operating temperature range extends to -40°C to 125°C. The OPA4140AIDR is RoHS3 compliant and Active product status.

Audio Amplifier Substitutes (OPA1654 Series)

The OPA1654AID and OPA1654AIDR are audio amplifiers with high gain bandwidth product of 18 MHz and slew rate of 10 V/µs. These devices require minimum supply voltage of 4.5 V and feature 50 mA output current per channel. Operating temperature range is -40°C to 85°C. Both are RoHS3 compliant and Active product status.

Frequently Asked Questions (FAQ)

Q: Can OPA4171AIDR be used as a direct replacement for LT1885CS#TRPBF?

A: Yes. The OPA4171AIDR is a direct pin-compatible substitute. Both devices are 14-SOIC surface mount packages with 4 rail-to-rail output circuits. The OPA4171AIDR supports the full 2.7 V to 36 V supply voltage range of the LT1885CS#TRPBF and provides comparable general purpose amplifier performance with slightly higher slew rate (1.5 V/µs versus 1 V/µs) and gain bandwidth product (3 MHz versus 2.2 MHz). The OPA4171AIDR extends operating temperature range to -40°C to 125°C.

Q: What is the difference between OPA4171AID and OPA4171AIDR packaging?

A: Both devices are electrically identical with identical specifications. The primary difference is packaging format. OPA4171AID is supplied in Tube packaging, while OPA4171AIDR is supplied in Cut Tape (CT) & Digi-Reel® format. Both are 14-SOIC surface mount packages suitable for automated assembly.

Q: When should OPA4188AIDR be selected over OPA4171AIDR?

A: The OPA4188AIDR zero-drift amplifier should be selected when applications require superior input offset voltage performance (6 µV versus 250 µV). The OPA4188AIDR is suitable for precision measurement and signal conditioning applications where offset voltage drift must be minimized. However, the OPA4188AIDR requires minimum supply voltage of 4 V (versus 2.7 V for OPA4171AIDR) and provides reduced output current of 18 mA per channel (versus 35 mA for OPA4171AIDR).

Q: Is OPA4241UA/2K5 suitable for high-speed applications?

A: No. The OPA4241UA/2K5 is a micropower amplifier with gain bandwidth product of only 35 kHz and slew rate of 0.01 V/µs. This device is designed for ultra-low-power applications where bandwidth and slew rate requirements are minimal. For applications requiring bandwidth comparable to the LT1885CS#TRPBF (2.2 MHz), the OPA4171AIDR or OPA4188AIDR are appropriate selections.

Q: What is the advantage of OPA4140AIDR over other substitutes?

A: The OPA4140AIDR J-FET amplifier provides the lowest input bias current (0.5 pA) and highest slew rate (20 V/µs) among all substitutes. This device is suitable for applications requiring high-impedance input signal sources or fast transient response. However, the OPA4140AIDR requires minimum supply voltage of 4.5 V and provides reduced output current of 36 mA per channel.

Q: Can OPA1654AIDR be used in place of LT1885CS#TRPBF?

A: The OPA1654AIDR is pin-compatible in the 14-SOIC package but is designed as an audio amplifier with different performance characteristics. The OPA1654AIDR features higher gain bandwidth product (18 MHz) and slew rate (10 V/µs) suitable for audio applications. However, the OPA1654AIDR requires minimum supply voltage of 4.5 V (versus 2.7 V for LT1885CS#TRPBF) and has higher input offset voltage (500 µV versus 30 µV). Selection should be based on specific application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (OPA4171 series, OPA4188 series, OPA4241 series, OPA4140AIDR, and OPA1654 series) are RoHS3 compliant, matching the compliance status of the LT1885CS#TRPBF.

Q: What is the operating temperature range difference between LT1885CS#TRPBF and OPA4171AIDR?

A: The LT1885CS#TRPBF operates from 0°C to 70°C, while the OPA4171AIDR operates from -40°C to 125°C. The OPA4171AIDR provides extended temperature range capability suitable for industrial and automotive applications requiring operation at lower and higher temperatures.

Q: Is OPA4171AQDRQ1 suitable for automotive applications?

A: Yes. The OPA4171AQDRQ1 is specifically qualified for automotive applications with AEC-Q100 qualification. This variant is identical to OPA4171AIDR except for automotive-grade qualification and requires minimum supply voltage of 4.5 V (versus 2.7 V for standard OPA4171AIDR).

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