OPA2234U Equivalent & Substitute Parts

Part Overview

The OPA2234U is a general-purpose operational amplifier manufactured by Texas Instruments, featuring two circuits in an 8-SOIC surface-mount package. This device is classified as obsolete, indicating it is no longer in active production. The OPA2234U operates across a wide supply voltage range of 2.7 V to 36 V and maintains functionality across industrial temperature ranges from -40°C to 125°C. Due to its obsolete status, identifying equivalent and substitute parts is essential for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPA2234U
Manufacturer	Texas Instruments
Amplifier Type	General Purpose
Number of Circuits	2
Package / Case	8-SOIC (0.154", 3.90mm Width)
Slew Rate	0.2 V/µs
Gain Bandwidth Product	350 kHz
Current - Input Bias	12 nA
Voltage - Input Offset	70 µV
Current - Supply	275 µA (x2 Channels)
Current - Output / Channel	22 mA
Voltage - Supply Span (Min)	2.7 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the OPA2234U is determined by compatibility across the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC surface-mount package to ensure direct PCB footprint compatibility without layout modifications.

Circuit Count: The OPA2234U contains two operational amplifier circuits. Substitute parts must maintain this dual-circuit configuration to support equivalent functional density.

Supply Voltage Range: The OPA2234U operates from 2.7 V to 36 V. Substitute parts must support the minimum supply voltage of 2.7 V and maximum of 36 V, or a range that encompasses the application's operating voltage window.

Operating Temperature Range: The OPA2234U functions across -40°C to 125°C. Substitute parts must support this full temperature range or the specific subset required by the application.

Electrical Performance Characteristics: Key parameters including slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and output current per channel determine functional equivalence. Substitute parts may exceed these specifications without functional degradation.

Compliance and Certification: All substitute parts must maintain ROHS3 compliance and REACH compliance status consistent with the original part.

Substitute parts are grouped into two categories: direct functional equivalents and performance-enhanced alternatives. Direct equivalents maintain similar electrical characteristics, while performance-enhanced alternatives provide superior specifications within the same package and pin configuration.

Parameter Comparison

Parameter	OPA2234U	OPA2187ID	LM158DT	LM258ADT	LM258DT	LM2904AYDT	LM2904DT	LM2904YDT	LM358ADT	LM358DT	LT1078IS8
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	Rohm Semiconductor	STMicroelectronics	STMicroelectronics	Rohm Semiconductor	Analog Devices Inc.
Number of Circuits	2	2	2	2	2	2	2	2	2	2	2
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Slew Rate (V/µs)	0.2	0.2	0.6	0.6	0.6	0.6	0.3	0.6	0.6	0.3	0.1
Gain Bandwidth Product (kHz)	350	550	1100	1100	1100	1100	700	700	1100	800	200
Current - Input Bias (nA)	12	0.1	20	20	20	20	20	20	20	20	6
Voltage - Input Offset (µV)	70	1	5000	1000	5000	1000	1000	2000	1000	1000	70
Current - Supply (µA)	275	100	700	700	700	700	600	700	700	600	47
Current - Output / Channel (mA)	22	30	40	40	40	40	30	30	40	30	N/A
Voltage - Supply Span (Min)	2.7 V	4.5 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V	2.2 V
Voltage - Supply Span (Max)	36 V	36 V	30 V	30 V	30 V	30 V	32 V	30 V	30 V	32 V	30 V
Operating Temperature (°C)	-40 ~ 125	-40 ~ 125	-55 ~ 125	-40 ~ 105	-40 ~ 105	-40 ~ 125	-40 ~ 125	-40 ~ 125	0 ~ 70	-40 ~ 85	-40 ~ 85
Product Status	Obsolete	Active	Active	Active	Active	Active	Not For New Designs	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

OPA2187ID is a direct Texas Instruments substitute with active product status. This zero-drift amplifier provides superior input offset voltage (1 µV versus 70 µV) and significantly lower input bias current (100 pA versus 12 nA). The OPA2187ID maintains identical slew rate and package configuration. However, the minimum supply voltage requirement increases to 4.5 V, which may restrict use in applications requiring 2.7 V operation. The OPA2187ID is suitable for precision applications where low offset voltage and bias current are critical requirements.

LM258ADT and LM258DT are STMicroelectronics general-purpose alternatives with active product status and automotive-grade qualification (AEC-Q100). Both parts maintain the 8-SOIC package and dual-circuit configuration. These devices provide higher gain bandwidth product (1.1 MHz versus 350 kHz) and improved slew rate (0.6 V/µs versus 0.2 V/µs). The maximum supply voltage is limited to 30 V, which is acceptable for most applications within the OPA2234U's operating range. The LM258ADT offers superior input offset voltage specification (1 mV versus 70 µV). Both parts are suitable for general-purpose applications where higher bandwidth is beneficial.

LM2904AYDT is an STMicroelectronics automotive-qualified part with active status. This device maintains the full -40°C to 125°C operating temperature range and provides higher output current capability (40 mA versus 22 mA per channel). The gain bandwidth product is 1.1 MHz, and input offset voltage is specified at 1 mV. The maximum supply voltage is 30 V. This part is appropriate for applications requiring automotive-grade reliability and higher output drive capability.

LM2904YDT is an STMicroelectronics automotive-qualified alternative with active status. This device maintains the full temperature range and provides 700 kHz gain bandwidth product with 30 mA output current per channel. The supply voltage range is 3 V to 30 V. This part is suitable for automotive applications where the OPA2234U's lower bandwidth is acceptable.

LT1078IS8 is an Analog Devices part with active product status. This device provides the lowest supply current (47 µA versus 275 µA) and maintains low input bias current (6 nA). The slew rate is lower (0.1 V/µs) and gain bandwidth product is reduced (200 kHz). The minimum supply voltage is 2.2 V, supporting ultra-low-voltage applications. The operating temperature range is limited to -40°C to 85°C. This part is optimal for battery-powered and ultra-low-power applications where supply current minimization is critical.

LM158DT is an STMicroelectronics automotive-qualified part with active status and extended temperature range (-55°C to 125°C). This device provides higher gain bandwidth product (1.1 MHz) and improved slew rate (0.6 V/µs). The maximum supply voltage is 30 V. This part is suitable for extended-temperature automotive and industrial applications.

LM358ADT is an STMicroelectronics automotive-qualified part with active status. This device provides 1.1 MHz gain bandwidth product and 40 mA output current per channel. The operating temperature range is limited to 0°C to 70°C, restricting use in applications requiring full industrial temperature coverage. This part is suitable for commercial and automotive applications within the specified temperature window.

Parts with obsolete or "Not For New Designs" status (LM358DT, LM2904DT) are not recommended for new designs but may be used for legacy system maintenance and repair.

Frequently Asked Questions (FAQ)

Q: Can the OPA2234U be directly replaced with any of these substitute parts without PCB modifications?

A: Yes, all listed substitute parts use the 8-SOIC surface-mount package with identical pin spacing (0.154" width, 3.90mm). Direct PCB footprint compatibility is maintained. However, electrical performance differences may require circuit validation, particularly regarding supply voltage requirements and operating temperature ranges.

Q: What is the primary difference between the OPA2187ID and other substitutes?

A: The OPA2187ID is a zero-drift amplifier featuring significantly lower input offset voltage (1 µV) and input bias current (100 pA) compared to the OPA2234U (70 µV and 12 nA respectively). This makes it suitable for precision measurement applications. The trade-off is a higher minimum supply voltage requirement of 4.5 V versus 2.7 V for the OPA2234U.

Q: Which substitute part is best for low-power battery applications?

A: The LT1078IS8 provides the lowest supply current at 47 µA per dual-circuit package, compared to 275 µA for the OPA2234U. This part is optimized for battery-powered systems. However, it has a lower gain bandwidth product (200 kHz) and reduced operating temperature range (-40°C to 85°C).

Q: Are all substitute parts automotive-qualified?

A: No. Automotive-qualified parts with AEC-Q100 certification include LM158DT, LM258ADT, LM2904AYDT, and LM2904YDT. The OPA2187ID, LM258DT, LM358ADT, LM358DT, and LT1078IS8 do not carry automotive qualification. Automotive applications must use qualified parts.

Q: What is the impact of the OPA2234U's 2.7 V minimum supply voltage on substitute selection?

A: Most substitute parts require a minimum of 3 V supply voltage, which eliminates their use in applications operating below 3 V. The LT1078IS8 supports 2.2 V minimum supply voltage and is the only substitute suitable for ultra-low-voltage applications. The OPA2187ID requires 4.5 V minimum, further restricting its use in low-voltage designs.

Q: Can the OPA2234U be used in new designs, or should a substitute be selected?

A: The OPA2234U is classified as obsolete and should not be used in new designs. Active alternatives such as OPA2187ID, LM258ADT, LM2904AYDT, LM2904YDT, and LT1078IS8 are recommended for new designs to ensure long-term supply availability and manufacturer support.

Q: How do the bandwidth specifications of substitute parts compare to the OPA2234U?

A: The OPA2234U has a gain bandwidth product of 350 kHz. Most STMicroelectronics substitutes (LM258ADT, LM258DT, LM158DT, LM358ADT) provide 1.1 MHz, offering significantly higher bandwidth. The LM2904 variants provide 700 kHz. The LT1078IS8 provides only 200 kHz, suitable for lower-frequency applications. Higher bandwidth may require circuit stability analysis to prevent oscillation.

Q: What is the significance of the OPA2234U's 36 V maximum supply voltage?

A: The OPA2234U supports supply voltages up to 36 V, enabling use in industrial and automotive systems with higher supply rails. Most substitute parts limit maximum supply to 30 V or 32 V. Applications requiring 36 V operation must verify that the selected substitute part's maximum supply voltage meets system requirements.

Q: Are there any moisture sensitivity differences between the OPA2234U and substitute parts?

A: The OPA2234U has MSL 3 (168 hours), indicating moderate moisture sensitivity. Most substitute parts have MSL 1 (unlimited), indicating superior moisture resistance. This provides better handling flexibility during manufacturing and storage for substitute parts.

Q: Which substitute part provides the best overall performance match to the OPA2234U?

A: The OPA2187ID from Texas Instruments provides the closest functional match with identical slew rate (0.2 V/µs), same manufacturer, and superior electrical specifications. However, the 4.5 V minimum supply voltage may be restrictive. For applications requiring the full 2.7 V to 36 V supply range, the LT1078IS8 is the only substitute supporting 2.7 V minimum operation, though with reduced bandwidth and higher supply current.

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