LT1881CS8 Equivalent & Substitute Parts

Part Overview

The LT1881CS8 is a general-purpose operational amplifier manufactured by Analog Devices Inc., featuring dual circuits in a rail-to-rail configuration. This device operates across a wide supply voltage range of 2.7 V to 36 V and is designed for applications requiring low input bias current and minimal input offset voltage. The part is currently in active production status with 2,388 units in stock.

Substitute parts become necessary when the original LT1881CS8 is unavailable, when alternative packaging formats are required, or when enhanced performance characteristics are needed for specific application requirements while maintaining functional compatibility within the 8-SOIC form factor.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	0.4	V/µs
Gain Bandwidth Product	850	kHz
Current - Input Bias	150	pA
Voltage - Input Offset	30	µV
Current - Supply (x2 Channels)	850	µA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LT1881CS8 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Dual-circuit (2 circuits) general-purpose operational amplifier configuration
Rail-to-rail output capability
8-SOIC surface-mount package format (0.154", 3.90mm width)
Supply voltage range compatibility: minimum 2.7 V, maximum 36 V
Operating temperature range: 0°C to 70°C or extended range

Performance Parameters Affecting Substitution:

Slew rate (0.4 V/µs baseline)
Gain bandwidth product (850 kHz baseline)
Input bias current (150 pA baseline)
Input offset voltage (30 µV baseline)
Supply current per channel (850 µA baseline)
Output current per channel (40 mA baseline)

Substitute parts are grouped into two categories: direct packaging variants of the LT1881CS8 and functionally equivalent parts from alternative manufacturers that meet or exceed the electrical specifications while maintaining the same package footprint and pin configuration.

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (kHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Packaging Format
LT1881CS8	Analog Devices	0.4	850	150	30	850	40	2.7	36	0 to 70	8-SOIC	Tube
LT1881CS8#PBF	Analog Devices	0.4	850	150	30	850	40	2.7	36	0 to 70	8-SOIC	Tube
OPA2171AID	Texas Instruments	1.5	3000	8	250	475	35	2.7	36	-40 to 125	8-SOIC	Tube
OPA2171AIDR	Texas Instruments	1.5	3000	8	250	475	35	2.7	36	-40 to 125	8-SOIC	Cut Tape & Digi-Reel
OPA2171AQDRQ1	Texas Instruments	1.5	3000	8	250	475	35	2.7	36	-40 to 125	8-SOIC	Tape & Reel
OPA2172ID	Texas Instruments	10	10000	8	200	1600	75	4.5	36	-40 to 125	8-SOIC	Tube
OPA2172IDR	Texas Instruments	10	10000	8	200	1600	75	4.5	36	-40 to 125	8-SOIC	Cut Tape & Digi-Reel
OPA2211AIDDA	Texas Instruments	27	80000	60	30	3600	45	4.5	36	-40 to 125	8-PowerSOIC	Tube
OPA2211AIDDAR	Texas Instruments	27	80000	60	30	3600	45	4.5	36	-40 to 125	8-PowerSOIC	Cut Tape & Digi-Reel
OPA2241UA	Texas Instruments	0.01	35	4000	50	25	50	2.7	36	-40 to 85	8-SOIC	Tube
OPA2241UA/2K5	Texas Instruments	0.01	35	4000	50	25	36	2.7	36	-40 to 85	8-SOIC	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Packaging Equivalent:

LT1881CS8#PBF is an identical electrical equivalent to the LT1881CS8, differing only in packaging format (tube). This part is suitable for direct substitution when tube packaging is acceptable. Both parts maintain identical electrical specifications and are ROHS3 compliant with MSL 1 rating.

Texas Instruments OPA2171 Series (OPA2171AID, OPA2171AIDR, OPA2171AQDRQ1):

The OPA2171 series provides enhanced performance over the LT1881CS8 with 3.5× higher slew rate (1.5 V/µs vs. 0.4 V/µs) and 3.5× higher gain bandwidth product (3 MHz vs. 850 kHz). Input bias current is significantly lower at 8 pA. These parts maintain the same 2.7 V to 36 V supply range and 8-SOIC package footprint. The OPA2171AQDRQ1 variant includes automotive-grade qualification (AEC-Q100) and is suitable for extended temperature applications (-40°C to 125°C). All variants are ROHS3 compliant.

Texas Instruments OPA2172 Series (OPA2172ID, OPA2172IDR):

The OPA2172 series delivers significantly higher performance with 25× higher slew rate (10 V/µs) and 11.8× higher gain bandwidth product (10 MHz). Output current capability is increased to 75 mA per channel. These parts require a minimum supply voltage of 4.5 V and are suitable for applications demanding higher speed and output drive capability. Operating temperature range extends to -40°C to 125°C. Both variants are ROHS3 compliant.

Texas Instruments OPA2211 Series (OPA2211AIDDA, OPA2211AIDDAR):

The OPA2211 series represents the highest performance option with 67.5× higher slew rate (27 V/µs) and 94× higher gain bandwidth product (80 MHz). This part uses an 8-PowerSOIC package variant and requires minimum 4.5 V supply. Extended operating temperature range (-40°C to 125°C) and MSL 1 rating are provided. Suitable for high-speed signal conditioning and precision applications.

Texas Instruments OPA2241 Series (OPA2241UA, OPA2241UA/2K5):

The OPA2241 series is a microPOWER variant optimized for ultra-low supply current (25 µA per channel). This part is suitable for battery-powered and energy-constrained applications. Slew rate and gain bandwidth product are significantly reduced (0.01 V/µs and 35 kHz respectively), making this part suitable only for low-frequency applications. Operating temperature range is -40°C to 85°C. The OPA2241UA is listed as Last Time Buy status.

Compliance and Certification:

All substitute parts listed are ROHS3 compliant and REACH unaffected. Selection should prioritize parts with active product status. The OPA2171AQDRQ1 is the only automotive-qualified option (AEC-Q100) and is recommended for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can the LT1881CS8 be directly replaced with LT1881CS8#PBF?

A: Yes. These parts are electrically identical and differ only in packaging format. LT1881CS8#PBF uses tube packaging while the standard LT1881CS8 also uses tube packaging. Both are suitable for direct substitution in the same application.

Q: What is the primary difference between the LT1881CS8 and the OPA2171 series?

A: The OPA2171 series provides superior dynamic performance with 3.5× higher slew rate and 3.5× higher gain bandwidth product. Input bias current is also significantly lower (8 pA vs. 150 pA). Both maintain the same supply voltage range (2.7 V to 36 V) and 8-SOIC package footprint. The OPA2171 extends operating temperature to -40°C to 125°C.

Q: Can I use the OPA2172 series as a drop-in replacement for the LT1881CS8?

A: The OPA2172 is pin-compatible and footprint-compatible but requires a minimum supply voltage of 4.5 V instead of 2.7 V. If your application operates at 2.7 V to 4.4 V, the OPA2172 is not suitable. For applications with 4.5 V or higher supply voltage, the OPA2172 provides superior performance with 25× higher slew rate and 11.8× higher gain bandwidth product.

Q: What is the difference between OPA2171AID and OPA2171AIDR?

A: Both parts are electrically identical. The primary difference is packaging format: OPA2171AID uses tube packaging, while OPA2171AIDR uses cut tape and Digi-Reel format. OPA2171AIDR has significantly higher inventory availability (25,400 units vs. 3,161 units).

Q: Is the OPA2211 series suitable for all applications where the LT1881CS8 is used?

A: The OPA2211 series is pin-compatible and footprint-compatible but uses an 8-PowerSOIC package variant instead of standard 8-SOIC. The OPA2211 requires minimum 4.5 V supply voltage. If your PCB layout accommodates the PowerSOIC package and your supply voltage is 4.5 V or higher, the OPA2211 provides significantly enhanced performance. Verify PCB footprint compatibility before selection.

Q: When should I use the OPA2241 series instead of the LT1881CS8?

A: The OPA2241 series is optimized for ultra-low power consumption (25 µA per channel vs. 850 µA) and is suitable for battery-powered applications. However, the OPA2241 has severely limited bandwidth (35 kHz vs. 850 kHz) and slew rate (0.01 V/µs vs. 0.4 V/µs). Use the OPA2241 only for low-frequency applications where power consumption is the primary design constraint. The OPA2241UA is currently listed as Last Time Buy status.

Q: What is the significance of the AEC-Q100 qualification on the OPA2171AQDRQ1?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. The OPA2171AQDRQ1 is the only automotive-qualified option among the listed substitutes and is required for automotive applications. This part also carries MSL 3 rating (168 hours) compared to MSL 1 for other variants.

Q: Can I substitute the LT1881CS8 with the OPA2211 if my PCB is already designed for 8-SOIC?

A: The OPA2211 uses an 8-PowerSOIC package, which has a different footprint than standard 8-SOIC despite similar pin count. PCB layout verification is required. The PowerSOIC variant includes an exposed thermal pad on the bottom, which may require different PCB design. Consult the detailed package drawings before proceeding with substitution.

Q: What are the key parameters I should verify when selecting a substitute?

A: Verify the following parameters for your specific application: (1) supply voltage range compatibility, (2) operating temperature range requirements, (3) package footprint compatibility with your PCB layout, (4) slew rate and gain bandwidth product requirements for signal fidelity, (5) input bias current and offset voltage for precision requirements, (6) output current capability for load driving, and (7) compliance certifications (RoHS, automotive qualification if required).

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