LT2179CS#TRPBF Equivalent & Substitute Parts

Part Overview

The LT2179CS#TRPBF 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 output amplifier operates across a wide supply voltage range of 2.2 V to 36 V and is designed for applications requiring low power consumption and compact integration. The device is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent functional performance can be achieved within the constraints of the 14-SOIC package format and general purpose amplifier category, accounting for variations in electrical characteristics such as slew rate, gain bandwidth product, and supply voltage specifications.

Key Parameters

Parameter	LT2179CS#TRPBF
Manufacturer	Analog Devices Inc.
Category	Linear, Amplifiers
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
Voltage - Supply Span (Min)	2.2 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	0°C ~ 70°C
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LT2179CS#TRPBF is determined by the following criteria:

Package Compatibility: All substitute parts must use the 14-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Circuit Configuration: All substitute parts must contain four independent amplifier circuits to maintain functional equivalence in multi-channel applications.

Amplifier Classification: All substitute parts must be classified as general purpose operational amplifiers, ensuring compatibility with standard amplifier application topologies.

Supply Voltage Range: Substitute parts must support a minimum supply voltage of 2.2 V or lower and a maximum supply voltage of 36 V or higher to accommodate the original part's operating envelope.

Compliance Requirements: All substitute parts must maintain RoHS3 compliance and MSL 1 (Unlimited) rating to satisfy regulatory and manufacturing process requirements.

The identified substitute parts meet these criteria while exhibiting variations in secondary electrical characteristics including slew rate, gain bandwidth product, input bias current, and operating temperature range.

Parameter Comparison

Parameter	LT2179CS#TRPBF	MC33074DR2G	MC33174DT	MC33174VDR2G	MC34074VDR2G	NCV33074DR2G
Manufacturer	Analog Devices Inc.	onsemi	STMicroelectronics	onsemi	onsemi	onsemi
Number of Circuits	4	4	4	4	4	4
Package / Case	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
Voltage - Supply Span (Min)	2.2 V	3 V	4 V	3 V	3 V	3 V
Voltage - Supply Span (Max)	36 V	44 V	44 V	44 V	44 V	44 V
Slew Rate	0.04 V/µs	13 V/µs	2 V/µs	2.1 V/µs	13 V/µs	13 V/µs
Gain Bandwidth Product	85 kHz	4.5 MHz	2.1 MHz	1.8 MHz	4.5 MHz	4.5 MHz
Current - Input Bias	3 nA	100 nA	100 nA	20 nA	100 nA	100 nA
Voltage - Input Offset	100 µV	1 mV	1 mV	2 mV	1 mV	1 mV
Current - Supply	17 µA (x4 Channels)	1.9 mA (x4 Channels)	220 µA	180 µA (x4 Channels)	1.9 mA (x4 Channels)	1.9 mA (x4 Channels)
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Product Status	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

MC33074DR2G (onsemi): This substitute part maintains active product status and full RoHS3 compliance. The device operates across a 3 V to 44 V supply range, which encompasses the upper portion of the LT2179CS#TRPBF operating envelope. The significantly higher slew rate (13 V/µs versus 0.04 V/µs) and gain bandwidth product (4.5 MHz versus 85 kHz) indicate substantially faster transient response characteristics. The extended operating temperature range (-40°C to 85°C) provides broader environmental coverage. Selection of this part is appropriate for applications where the original part's low-frequency, low-power characteristics are not critical constraints.

MC33174DT (STMicroelectronics): This substitute maintains active status and RoHS3 compliance with a 4 V to 44 V supply range. The minimum supply voltage of 4 V exceeds the LT2179CS#TRPBF minimum of 2.2 V, restricting use in ultra-low voltage applications. The operating temperature range extends to 105°C, providing enhanced thermal performance. The slew rate (2 V/µs) and gain bandwidth product (2.1 MHz) represent intermediate performance levels between the original part and higher-speed alternatives.

MC33174VDR2G (onsemi): This substitute offers active product status and RoHS3 compliance with a 3 V to 44 V supply range. The operating temperature range extends to 125°C, providing the highest thermal rating among all substitutes. The input bias current of 20 nA is the lowest among substitutes, approaching the original part's 3 nA specification. The slew rate (2.1 V/µs) and gain bandwidth product (1.8 MHz) represent moderate performance enhancement over the original part.

MC34074VDR2G (onsemi): This substitute maintains active status and RoHS3 compliance with a 3 V to 44 V supply range and extended operating temperature range (-40°C to 125°C). The electrical characteristics match MC33074DR2G with 13 V/µs slew rate and 4.5 MHz gain bandwidth product. The Tape & Reel packaging matches the original part's packaging format, facilitating direct integration into existing procurement workflows.

NCV33074DR2G (onsemi): This substitute is qualified to AEC-Q100 automotive standards and maintains active status with RoHS3 compliance. The 3 V to 44 V supply range and -40°C to 85°C operating temperature are consistent with MC33074DR2G. The automotive qualification designates this part for applications requiring automotive-grade component reliability. The electrical characteristics (13 V/µs slew rate, 4.5 MHz gain bandwidth product) match the MC33074DR2G specification.

Frequently Asked Questions (FAQ)

Q: Can the MC33074DR2G directly replace the LT2179CS#TRPBF in all applications?

A: The MC33074DR2G shares the 14-SOIC package format and four-circuit configuration, enabling mechanical and pin-level compatibility. However, the significantly higher slew rate and gain bandwidth product alter the frequency response and transient behavior. Applications designed specifically for the LT2179CS#TRPBF's low-frequency characteristics (85 kHz gain bandwidth product) may require circuit redesign to accommodate the MC33074DR2G's 4.5 MHz bandwidth. The minimum supply voltage difference (3 V versus 2.2 V) restricts use in ultra-low voltage systems.

Q: What is the significance of the supply voltage range differences?

A: The LT2179CS#TRPBF operates from 2.2 V minimum, enabling use in battery-powered and low-voltage applications. All identified substitutes require minimum supply voltages of 3 V or higher, excluding them from applications operating below 3 V. The maximum supply voltage of 36 V for the original part is exceeded by all substitutes (44 V maximum), providing additional headroom in higher-voltage systems.

Q: How do the slew rate differences affect circuit performance?

A: The LT2179CS#TRPBF exhibits a slew rate of 0.04 V/µs, characteristic of low-power, low-frequency amplifiers. Substitutes MC33074DR2G, MC34074VDR2G, and NCV33074DR2G provide 13 V/µs slew rate, enabling faster output voltage transitions. MC33174DT and MC33174VDR2G provide intermediate slew rates of 2 V/µs and 2.1 V/µs respectively. Applications requiring precise control of output rise time or operating at frequencies below 100 kHz may exhibit different behavior with higher-slew-rate substitutes.

Q: What is the impact of input bias current variations?

A: The LT2179CS#TRPBF specifies 3 nA input bias current, minimizing loading effects on high-impedance signal sources. Substitute parts specify input bias currents ranging from 20 nA (MC33174VDR2G) to 100 nA (MC33074DR2G, MC33174DT, MC34074VDR2G, NCV33074DR2G). Applications utilizing transimpedance amplifier topologies or photodiode interfaces may require input impedance recalculation to account for increased bias current.

Q: Are all substitute parts suitable for automotive applications?

A: The NCV33074DR2G is specifically qualified to AEC-Q100 automotive standards, designating it for automotive-grade reliability requirements. The remaining substitutes (MC33074DR2G, MC33174DT, MC33174VDR2G, MC34074VDR2G) do not carry automotive qualification. Applications requiring automotive-grade components must select NCV33074DR2G exclusively.

Q: How do operating temperature ranges affect part selection?

A: The LT2179CS#TRPBF operates across 0°C to 70°C. Substitute parts extend this range: MC33074DR2G and NCV33074DR2G to -40°C to 85°C, MC33174DT to -40°C to 105°C, and MC33174VDR2G and MC34074VDR2G to -40°C to 125°C. Applications requiring operation below 0°C or above 70°C necessitate selection of appropriate substitutes. Extended temperature range parts enable use in industrial and automotive environments with wider thermal extremes.

Q: What packaging format considerations apply to these substitutes?

A: All substitute parts utilize the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical compatibility with existing PCB layouts. Packaging format variations (Tape & Reel versus Cut Tape & Digi-Reel) affect procurement and assembly processes but do not alter electrical or mechanical performance. The MC34074VDR2G and LT2179CS#TRPBF both utilize Tape & Reel packaging, facilitating direct substitution in automated assembly workflows.

Q: Can the LT2179CS#TRPBF be substituted with parts having different output types?

A: The LT2179CS#TRPBF specifies rail-to-rail output type. Substitute parts MC33074DR2G, MC34074VDR2G, and NCV33074DR2G specify single-ended output type, while MC33174DT and MC33174VDR2G do not specify output type in the provided data. Output type differences may affect maximum output voltage swing and load driving capability. Applications requiring full rail-to-rail output swing should verify substitute part specifications against system requirements.

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