LT1678CS8#TRPBF Equivalent & Substitute Parts

Part Overview

The LT1678CS8#TRPBF is a general purpose operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) rail-to-rail output device in an 8-SOIC surface mount package. This component is classified as a linear amplifier and maintains active product status with full RoHS3 compliance. The LT1678CS8#TRPBF is supplied in Tape & Reel (TR) packaging format.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges. Substitution becomes necessary due to inventory availability, supply chain considerations, or application-specific performance requirements within the allowed electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	6	V/µs
Gain Bandwidth Product	20	MHz
Current - Input Bias	2	nA
Voltage - Input Offset	20	µV
Current - Supply (per 2 Channels)	2.5	mA
Current - Output / Channel	35	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°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

Substitute parts for the LT1678CS8#TRPBF are qualified based on the following criteria:

Mechanical Compatibility: All substitute parts must be housed in the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB footprint compatibility.

Electrical Configuration: Substitute parts must maintain dual-channel (2 circuit) configuration with rail-to-rail output capability.

Supply Voltage Range: Substitute parts must support the maximum supply voltage of 36 V. The minimum supply voltage requirement of 2.7 V applies to the primary part; substitute parts with higher minimum supply voltages (4.5 V) remain functionally compatible in applications operating within the 4.5 V to 36 V range.

Performance Parameters: Substitute parts are grouped by amplifier type classification (General Purpose or J-FET) and evaluated against slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and output current specifications. Parts with equivalent or superior performance in these parameters are considered suitable substitutes.

Compliance & Status: All substitute parts maintain active product status, RoHS3 compliance, and REACH unaffected status, ensuring regulatory equivalence with the primary part.

Parameter Comparison

Parameter	LT1678CS8#TRPBF	OPA2140AID	OPA2140AIDR	OPA2171AQDRQ1	OPA2172ID	OPA2172IDR	OPA2209AID	OPA2209AIDR
Manufacturer	Analog Devices Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	J-FET	J-FET	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	2	2	2	2	2	2	2	2
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
Slew Rate (V/µs)	6	20	20	1.5	10	10	6.4	6.4
Gain Bandwidth Product (MHz)	20	11	11	3	10	10	18	18
Current - Input Bias (nA/pA)	2 nA	0.5 pA	0.5 pA	8 pA	8 pA	8 pA	1 nA	1 nA
Voltage - Input Offset (µV)	20	30	30	250	200	200	35	35
Current - Supply (mA, x2 Channels)	2.5	1.8	1.8	0.475	1.6	1.6	2.2	2.2
Current - Output / Channel (mA)	35	36	36	35	75	75	65	65
Voltage - Supply Span (Min)	2.7 V	4.5 V	4.5 V	2.7 V	4.5 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
Operating Temperature	-40 to 85°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	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	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	2 (1 Year)	2 (1 Year)	3 (168 Hours)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

General Purpose Amplifier Substitutes (OPA2209AIDR, OPA2209AID, OPA2172IDR, OPA2172ID):

The OPA2209AIDR and OPA2209AID maintain general purpose amplifier classification with performance characteristics closely aligned to the LT1678CS8#TRPBF. These parts deliver 18 MHz gain bandwidth product and 6.4 V/µs slew rate, providing equivalent or superior dynamic performance. Supply current of 2.2 mA and output current of 65 mA per channel support comparable load-driving capability. All parts maintain 4.5 V to 36 V supply range compatibility and RoHS3 compliance. The OPA2209AIDR variant in Cut Tape & Digi-Reel packaging offers higher inventory availability (50,100 units) compared to the tube-packaged OPA2209AID (146,171 units).

The OPA2172IDR and OPA2172ID provide general purpose amplification with 10 MHz gain bandwidth product and 10 V/µs slew rate. These parts deliver superior output current capability (75 mA per channel) and lower supply current (1.6 mA per 2 channels), making them suitable for applications requiring higher output drive or reduced power consumption. The OPA2172IDR Cut Tape & Digi-Reel variant maintains substantial inventory (17,400 units).

J-FET Amplifier Substitutes (OPA2140AIDR, OPA2140AID):

The OPA2140AIDR and OPA2140AID are J-FET input operational amplifiers offering extremely low input bias current (0.5 pA) compared to the LT1678CS8#TRPBF (2 nA). These parts are suitable for applications requiring ultra-low input bias current characteristics. J-FET input topology delivers 20 V/µs slew rate and 11 MHz gain bandwidth product. Supply range of 4.5 V to 36 V and output current of 36 mA per channel maintain functional compatibility. The OPA2140AIDR Cut Tape & Digi-Reel variant provides highest inventory availability (18,180 units).

Automotive-Grade Substitute (OPA2171AQDRQ1):

The OPA2171AQDRQ1 is an automotive-qualified general purpose amplifier (AEC-Q100 certified) with extended operating temperature range (-40°C to 125°C). This part is suitable for applications requiring automotive-grade reliability and qualification. Performance characteristics include 3 MHz gain bandwidth product, 1.5 V/µs slew rate, and ultra-low supply current (475 µA per 2 channels). Supply range of 2.7 V to 36 V matches the LT1678CS8#TRPBF minimum specification. MSL rating of 3 (168 Hours) reflects automotive packaging requirements.

Packaging Considerations:

The LT1678CS8#TRPBF is supplied in Tape & Reel (TR) format. Substitute parts are available in multiple packaging formats: Cut Tape & Digi-Reel (CT), Tube, and Tape & Reel (TR). Packaging format selection does not affect electrical or mechanical compatibility but influences handling, storage, and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can OPA2140AIDR be used as a direct replacement for LT1678CS8#TRPBF?

A: OPA2140AIDR is mechanically compatible (8-SOIC package) and functionally equivalent as a dual-channel rail-to-rail amplifier. However, the OPA2140AIDR has a minimum supply voltage of 4.5 V compared to 2.7 V for the LT1678CS8#TRPBF. Applications operating at supply voltages below 4.5 V require the LT1678CS8#TRPBF or OPA2171AQDRQ1. The OPA2140AIDR is a J-FET input device with 0.5 pA input bias current versus 2 nA for the LT1678CS8#TRPBF, making it suitable for high-impedance input applications.

Q: What is the difference between OPA2209AIDR and OPA2209AID?

A: OPA2209AIDR and OPA2209AID are electrically identical general purpose dual-channel amplifiers with identical performance specifications. The difference is packaging format: OPA2209AIDR is supplied in Cut Tape & Digi-Reel format with 50,100 units in stock, while OPA2209AID is supplied in Tube format with 146,171 units in stock. Both maintain RoHS3 compliance and MSL rating of 2 (1 Year).

Q: Is OPA2172IDR suitable for applications requiring higher output current?

A: Yes. OPA2172IDR delivers 75 mA output current per channel compared to 35 mA for the LT1678CS8#TRPBF, providing superior load-driving capability. OPA2172IDR maintains general purpose amplifier classification, 10 MHz gain bandwidth product, and 10 V/µs slew rate. Supply current is 1.6 mA per 2 channels, lower than the LT1678CS8#TRPBF (2.5 mA). Minimum supply voltage is 4.5 V.

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

A: MSL ratings indicate moisture sensitivity during storage and handling. The LT1678CS8#TRPBF has MSL 1 (Unlimited), meaning no moisture precautions are required. Substitute parts with MSL 2 (1 Year) or MSL 3 (168 Hours) require controlled storage conditions and have defined shelf life limits. MSL 2 parts must be used within 1 year of packaging; MSL 3 parts within 168 hours of opening the moisture barrier bag.

Q: Can OPA2171AQDRQ1 be used in non-automotive applications?

A: Yes. OPA2171AQDRQ1 is an automotive-qualified part suitable for any application. Automotive qualification (AEC-Q100) indicates enhanced reliability testing and quality assurance. The part is functionally compatible with the LT1678CS8#TRPBF in applications operating within the 2.7 V to 36 V supply range and -40°C to 125°C temperature range.

Q: What are the key performance differences between general purpose and J-FET amplifier substitutes?

A: General purpose amplifiers (OPA2209, OPA2172, OPA2171) use bipolar input stages with input bias currents in the nanoampere to picoampere range and moderate input offset voltages (20–250 µV). J-FET amplifiers (OPA2140) use field-effect transistor input stages with extremely low input bias current (0.5 pA) and higher input offset voltage (30 µV). J-FET devices are preferred for high-impedance input circuits; general purpose devices are preferred for low-noise, low-offset applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory equivalence with the LT1678CS8#TRPBF for applications subject to RoHS and REACH requirements.

Q: What is the impact of different slew rates on circuit performance?

A: Slew rate determines the maximum rate of voltage change at the amplifier output. The LT1678CS8#TRPBF has 6 V/µs slew rate. Substitute parts range from 1.5 V/µs (OPA2171AQDRQ1) to 20 V/µs (OPA2140 series). Higher slew rates support faster signal transitions and higher-frequency applications. Lower slew rates may introduce distortion in high-frequency or high-amplitude signal applications.

Q: Can substitute parts with higher operating temperature ranges be used in place of the LT1678CS8#TRPBF?

A: Yes. The LT1678CS8#TRPBF operates from -40°C to 85°C. All substitute parts operate from -40°C to 125°C, providing extended high-temperature capability. Substitution is valid for applications operating within the LT1678CS8#TRPBF temperature range (-40°C to 85°C) and for applications requiring extended temperature operation up to 125°C.

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