LT1885IS Equivalent & Substitute Parts

Part Overview

The LT1885IS is a general-purpose operational amplifier integrated circuit manufactured by Analog Devices Inc., configured as a 4-circuit rail-to-rail amplifier in a 14-SOIC surface mount package. This device is classified as Active product status and is ROHS3 compliant. The LT1885IS serves applications requiring low input bias current, low input offset voltage, and moderate bandwidth performance across a wide supply voltage range. Substitute parts are identified when equivalent electrical performance, package compatibility, and operational specifications align with the original component, enabling design flexibility and supply chain alternatives.

Key Parameters

Parameter	Value	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	-40 to 85	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LT1885IS are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Number of Circuits: 4 (quad configuration required)
Output Type: Rail-to-Rail (mandatory for supply voltage utilization)
Package / Case: 14-SOIC (0.154", 3.90mm Width) (physical and electrical compatibility)
Mounting Type: Surface Mount (PCB assembly compatibility)
Voltage - Supply Span: Minimum 2.7 V and Maximum 36 V (operational range coverage)
Operating Temperature: -40°C to 85°C minimum (industrial temperature range)

Secondary Performance Parameters:

Slew Rate: 1 V/µs or greater (signal fidelity)
Gain Bandwidth Product: 2.2 MHz or greater (frequency response)
Current - Input Bias: 150 pA or lower (input impedance characteristics)
Voltage - Input Offset: 30 µV or lower (DC accuracy)
Current - Output / Channel: 50 mA or greater (load driving capability)

Substitutes are grouped into two categories: Direct equivalents (identical specifications and packaging) and similar alternatives (compatible electrical performance with allowable parameter variations).

Parameter Comparison

Parameter	LT1885IS	LT1885IS#PBF	OP747ARZ	OP747ARZ-REEL7	OPA4140AIDR	OPA4171AID	OPA4171AIDR	OPA4171AQDRQ1	OPA4241UA	OPA4241UA/2K5	OPA4251UA
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	J-FET	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
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
Slew Rate (V/µs)	1	1	0.2	0.2	20	1.5	1.5	1.5	0.01	0.01	0.01
Gain Bandwidth Product (MHz)	2.2	2.2	0.7	0.7	11	3	3	3	0.035	0.035	0.035
Current - Input Bias (pA)	150	150	5000	5000	0.5	8	8	8	4000	4000	20000
Voltage - Input Offset (µV)	30	30	30	30	30	250	250	250	50	50	100
Current - Supply (µA, x4 Channels)	850	850	320	320	1800	475	475	475	25	25	—
Current - Output / Channel (mA)	50	50	30	30	36	35	35	35	50	50	50
Voltage - Supply Span Min (V)	2.7	2.7	2.7	2.7	4.5	2.7	2.7	4.5	2.7	2.7	2.7
Voltage - Supply Span Max (V)	36	36	30	30	36	36	36	36	36	36	36
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 125	-40 to 125	-40 to 125	-40 to 125	-40 to 85	-40 to 85	-40 to 85
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	5 (48 Hours)	5 (48 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Direct Equivalent Substitution:

LT1885IS#PBF is a direct equivalent to LT1885IS. Both devices are manufactured by Analog Devices Inc., share identical electrical specifications, and are packaged in 14-SOIC configuration. The primary difference is packaging format: LT1885IS is supplied in standard packaging while LT1885IS#PBF is supplied in Tube packaging. Both are Active product status and ROHS3 compliant. Selection between these two is determined by procurement and assembly requirements.

Compatible Substitutes with Performance Trade-offs:

OP747ARZ and OP747ARZ-REEL7 are quad general-purpose rail-to-rail amplifiers in 14-SOIC packages manufactured by Analog Devices Inc. These devices operate within the required supply voltage range (2.7 V to 30 V maximum) and temperature range (-40°C to 85°C). However, they exhibit reduced slew rate (0.2 V/µs versus 1 V/µs) and lower gain bandwidth product (700 kHz versus 2.2 MHz), making them suitable only for applications with lower frequency requirements. Input bias current is significantly higher (5 nA versus 150 pA). Both are ROHS3 compliant and Active status.

OPA4171AID, OPA4171AIDR, and OPA4171AQDRQ1 are quad general-purpose rail-to-rail amplifiers manufactured by Texas Instruments in 14-SOIC packages. These devices support the full supply voltage range (2.7 V to 36 V, with OPA4171AQDRQ1 minimum at 4.5 V) and extended operating temperature (-40°C to 125°C). Slew rate (1.5 V/µs) and gain bandwidth product (3 MHz) exceed LT1885IS specifications. Input offset voltage is higher (250 µV versus 30 µV). OPA4171AQDRQ1 includes automotive qualification (AEC-Q100). All three are ROHS3 compliant and Active status.

OPA4140AIDR is a quad J-FET amplifier manufactured by Texas Instruments in 14-SOIC package. This device offers superior slew rate (20 V/µs) and gain bandwidth product (11 MHz), with extremely low input bias current (0.5 pA). Supply voltage range is 4.5 V to 36 V (higher minimum than LT1885IS), and operating temperature extends to 125°C. This device is suitable for applications requiring high-speed performance and very low input bias current. ROHS3 compliant and Active status.

OPA4241UA and OPA4241UA/2K5 are quad microPOWER general-purpose rail-to-rail amplifiers manufactured by Texas Instruments in 14-SOIC packages. These devices are optimized for ultra-low power consumption (25 µA total supply current versus 850 µA for LT1885IS). Slew rate (0.01 V/µs) and gain bandwidth product (35 kHz) are significantly reduced, limiting application to low-frequency, battery-powered circuits. Supply voltage range (2.7 V to 36 V) and operating temperature (-40°C to 85°C) match LT1885IS. Both are ROHS3 compliant and Active status.

OPA4251UA is a quad microPOWER general-purpose rail-to-Rail amplifier manufactured by Texas Instruments in 14-SOIC package. Similar to OPA4241 series with ultra-low power consumption. Input bias current (20 nA) and input offset voltage (100 µV) are higher than OPA4241 variants. Slew rate and gain bandwidth product are identical to OPA4241 series. ROHS3 compliant and Active status.

Frequently Asked Questions (FAQ)

Q: Can LT1885IS#PBF be used as a direct replacement for LT1885IS?

A: Yes. LT1885IS#PBF is electrically and functionally identical to LT1885IS. Both devices share the same specifications, performance characteristics, and 14-SOIC package dimensions. The difference is packaging format: standard packaging versus Tube packaging. Selection depends on assembly and procurement requirements.

Q: What are the key differences between LT1885IS and OP747ARZ?

A: Both are quad general-purpose rail-to-rail amplifiers in 14-SOIC packages. LT1885IS offers superior performance with slew rate of 1 V/µs (versus 0.2 V/µs), gain bandwidth product of 2.2 MHz (versus 700 kHz), and lower input bias current of 150 pA (versus 5 nA). OP747ARZ has lower supply current (320 µA versus 850 µA) and maximum supply voltage of 30 V (versus 36 V). OP747ARZ is suitable for lower-frequency applications with power constraints.

Q: Is OPA4140AIDR compatible with LT1885IS applications?

A: OPA4140AIDR is a J-FET amplifier with significantly different performance characteristics. It offers higher slew rate (20 V/µs), higher gain bandwidth product (11 MHz), and extremely low input bias current (0.5 pA). However, minimum supply voltage is 4.5 V (versus 2.7 V for LT1885IS). OPA4140AIDR is suitable for high-speed, low-bias-current applications but not for designs requiring operation below 4.5 V supply voltage.

Q: When should OPA4241UA be selected over LT1885IS?

A: OPA4241UA is a microPOWER device with total supply current of 25 µA (versus 850 µA for LT1885IS). Selection is appropriate for battery-powered or ultra-low-power applications where frequency response is limited to 35 kHz gain bandwidth product. Slew rate is 0.01 V/µs, restricting use to low-frequency signal conditioning. Supply voltage range (2.7 V to 36 V) and operating temperature (-40°C to 85°C) match LT1885IS.

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

A: LT1885IS and LT1885IS#PBF have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. Substitute parts with MSL 3 or MSL 5 require controlled storage conditions: MSL 3 allows 168 hours at 60% relative humidity and 30°C before reflow, while MSL 5 allows only 48 hours. Higher MSL ratings require more stringent moisture control during assembly.

Q: Can OPA4171AQDRQ1 replace LT1885IS in automotive applications?

A: OPA4171AQDRQ1 includes automotive qualification (AEC-Q100) and is suitable for automotive-grade designs. However, minimum supply voltage is 4.5 V (versus 2.7 V for LT1885IS). Electrical performance is compatible: slew rate 1.5 V/µs, gain bandwidth product 3 MHz, and operating temperature -40°C to 125°C. Selection requires verification that 4.5 V minimum supply voltage meets application requirements.

Q: What are the package compatibility considerations for 14-SOIC substitutes?

A: All listed substitute parts use 14-SOIC (0.154", 3.90mm Width) package, ensuring identical PCB footprint and pin configuration with LT1885IS. Surface mount assembly equipment and reflow profiles are compatible across all substitutes. Differences in Moisture Sensitivity Level (MSL) may require adjusted storage and handling procedures but do not affect physical compatibility.

Q: How do OPA4171 variants differ from each other?

A: OPA4171AID is supplied in Tube packaging, while OPA4171AIDR is supplied in Cut Tape (CT) & Digi-Reel packaging. OPA4171AQDRQ1 is also supplied in Cut Tape & Digi-Reel but includes automotive qualification (AEC-Q100) and has minimum supply voltage of 4.5 V (versus 2.7 V for other OPA4171 variants). Electrical specifications are identical across all three: slew rate 1.5 V/µs, gain bandwidth product 3 MHz, operating temperature -40°C to 125°C.

Q: Is supply voltage range a critical substitution parameter?

A: Yes. LT1885IS operates from 2.7 V to 36 V. Substitutes with higher minimum supply voltage (such as OPA4140AIDR at 4.5 V or OPA4171AQDRQ1 at 4.5 V) are not compatible with applications requiring operation below their minimum voltage. Conversely, substitutes with lower maximum supply voltage (such as OP747ARZ at 30 V maximum) cannot be used in applications requiring 36 V operation.

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