OPA4234U Equivalent & Substitute Parts

Part Overview

The OPA4234U is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-SOIC surface mount packaging. This device is classified as obsolete, indicating it is no longer in active production. The OPA4234U operates across a wide supply voltage range of 2.7 V to 36 V and maintains functionality over the industrial temperature range of -40°C to 125°C. Due to its obsolete status, identifying equivalent and substitute parts is necessary for ongoing design support, production continuity, and long-term component availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPA4234U
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Package / Case	14-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 (x4 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 OPA4234U is determined by the following critical parameters: number of circuits (4), package type (14-SOIC surface mount), supply voltage range compatibility, operating temperature range, and functional amplifier classification. Substitute parts must maintain the same circuit count and physical package dimensions to ensure direct board-level compatibility without layout modifications.

The OPA4234U operates with a minimum supply voltage of 2.7 V and maximum of 36 V. Substitute parts must support this voltage range or a compatible subset. The operating temperature range of -40°C to 125°C establishes the baseline thermal specification; substitutes operating within this range or an extended range are acceptable.

Key electrical parameters that define substitution eligibility include slew rate (0.2 V/µs), gain bandwidth product (350 kHz), input bias current (12 nA), input offset voltage (70 µV), and output current per channel (22 mA). Substitute parts with equal or superior electrical performance in these parameters are functionally compatible.

All substitute parts must be surface mount devices in 14-SOIC packaging and maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Parameter Comparison

Parameter	OPA4234U	OPA4187ID	LM124DT	LM224ADT	LM224DT	LM2902AWYDT	LM2902DT	LM2902WYDT	LM2902YDT	LM324ADT	LM324DT
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	Rohm Semiconductor	STMicroelectronics	STMicroelectronics	STMicroelectronics	Rohm Semiconductor
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Slew Rate (V/µs)	0.2	0.2	0.4	0.4	0.4	0.4	0.3	0.4	0.4	0.4	0.3
Gain Bandwidth Product (kHz)	350	550	1300	1300	1300	1300	800	1300	1300	1300	1300
Current - Input Bias (nA)	12	0.1	20	20	20	20	20	20	20	20	20
Voltage - Input Offset (µV)	70	1	2000	2000	2000	2000	1000	2000	2000	2000	1000
Current - Supply (mA)	0.275	0.1	1.5	1.5	1.5	1.5	1.0	1.5	1.5	1.5	1.0
Current - Output / Channel (mA)	22	30	40	40	40	40	30	40	60	40	40
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	3 V
Voltage - Supply Span (Max)	36 V	36 V	30 V	30 V	30 V	30 V	32 V	30 V	30 V	30 V	32 V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 70°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Not For New Designs	Active	Active	Active	Not For New Designs
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

Primary Substitute: OPA4187ID

The OPA4187ID from Texas Instruments is the most direct substitute for the OPA4234U. Both devices are manufactured by Texas Instruments and share identical 14-SOIC packaging. The OPA4187ID maintains the same operating temperature range (-40°C to 125°C) and supply voltage maximum (36 V), though its minimum supply voltage is 4.5 V compared to 2.7 V for the OPA4234U. The OPA4187ID offers superior electrical performance with higher gain bandwidth product (550 kHz versus 350 kHz), lower input offset voltage (1 µV versus 70 µV), and reduced input bias current (100 pA versus 12 nA). The OPA4187ID is currently in active production status, ensuring long-term availability. Both parts maintain ROHS3 compliance and EAR99 export classification.

Secondary Substitutes: LM2902WYDT, LM2902YDT, LM2902AWYDT

The LM2902 series from STMicroelectronics provides general-purpose 4-circuit amplifiers in 14-SOIC packaging with active production status. These devices support the full operating temperature range of -40°C to 125°C and operate within the supply voltage range of 3 V to 30 V. The LM2902 variants feature higher slew rates (0.4 V/µs) and gain bandwidth products (1.3 MHz) compared to the OPA4234U, providing enhanced performance for applications requiring faster signal processing. The LM2902YDT variant offers the highest output current per channel (60 mA) among the LM2902 series. All LM2902 variants maintain ROHS3 compliance and are qualified to AEC-Q100 automotive standards.

Tertiary Substitutes: LM224DT, LM224ADT

The LM224 series from STMicroelectronics offers general-purpose 4-circuit amplifiers in 14-SOIC packaging with active production status. These devices operate within the supply voltage range of 3 V to 30 V and feature slew rates of 0.4 V/µs and gain bandwidth products of 1.3 MHz. The LM224DT and LM224ADT differ in operating temperature ranges: LM224DT operates from -40°C to 105°C, while LM224ADT operates from 0°C to 70°C. Both maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Alternative Substitutes: LM124DT, LM324ADT, LM324DT

The LM124DT, LM324ADT, and LM324DT are general-purpose 4-circuit amplifiers in 14-SOIC packaging. The LM124DT from STMicroelectronics supports an extended operating temperature range of -55°C to 125°C and operates within 3 V to 30 V supply voltage range. The LM324ADT operates from 0°C to 70°C, which is narrower than the OPA4234U specification. The LM324DT from Rohm Semiconductor operates from -40°C to 85°C. All three devices feature slew rates of 0.3 to 0.4 V/µs and gain bandwidth products of 1.3 MHz. These parts are suitable for applications where the narrower temperature range is acceptable.

Not Recommended for New Designs: LM2902DT, LM324DT (Rohm)

The LM2902DT from Rohm Semiconductor and LM324DT from Rohm Semiconductor are marked as "Not For New Designs," indicating these manufacturers have discontinued active support for these specific part numbers. While these devices remain available in inventory, their use should be limited to legacy system maintenance and repair applications only.

Frequently Asked Questions (FAQ)

Q1: Can the OPA4187ID directly replace the OPA4234U without circuit modifications?

The OPA4187ID shares the same 14-SOIC package and pinout as the OPA4234U, enabling direct physical substitution on the printed circuit board. However, the minimum supply voltage differs: OPA4187ID requires 4.5 V minimum versus 2.7 V for the OPA4234U. If your circuit operates below 4.5 V, the OPA4187ID is not suitable. Additionally, the OPA4187ID exhibits superior electrical performance (lower offset voltage, lower input bias current, higher bandwidth), which may require circuit validation to confirm compatibility with existing feedback networks and compensation schemes.

Q2: What is the primary difference between the OPA4234U and LM2902 series substitutes?

The OPA4234U is a low-speed, low-power general-purpose amplifier with a gain bandwidth product of 350 kHz and slew rate of 0.2 V/µs. The LM2902 series offers significantly higher performance with gain bandwidth products of 1.3 MHz and slew rates of 0.4 V/µs. The LM2902 series is suitable for applications requiring faster signal processing and higher output current capability (40 to 60 mA per channel versus 22 mA for the OPA4234U). If your application requires the original low-speed characteristics, the LM2902 series may introduce stability issues in existing feedback networks.

Q3: Are all substitute parts ROHS3 compliant?

Yes, all substitute parts listed in this document maintain ROHS3 compliance, consistent with the OPA4234U. All parts are also classified as EAR99 for export purposes.

Q4: Which substitute offers the best long-term availability?

The OPA4187ID from Texas Instruments and the LM2902WYDT, LM2902YDT, and LM2902AWYDT from STMicroelectronics are all in active production status, ensuring long-term availability. The LM2902DT from Rohm Semiconductor and LM324DT from Rohm Semiconductor are marked "Not For New Designs" and should not be selected for new applications.

Q5: What is the significance of the MSL (Moisture Sensitivity Level) rating?

The OPA4234U carries an MSL rating of 3 (168 hours), indicating it requires more stringent moisture control during storage and handling compared to parts with MSL 1 or 2. Most substitute parts carry MSL 1 (unlimited shelf life), which provides superior handling flexibility and reduces the risk of moisture-induced failures during manufacturing.

Q6: Can I use LM324ADT if my application operates at 0°C to 70°C?

Yes, the LM324ADT is suitable for applications operating within the 0°C to 70°C temperature range. However, if your application requires operation below 0°C or above 70°C, the LM324ADT is not appropriate. The OPA4187ID, LM2902 series, and LM224DT support the full -40°C to 125°C range of the original OPA4234U.

Q7: What is the impact of supply voltage range differences on substitution?

The OPA4234U operates from 2.7 V to 36 V. Most substitute parts operate from 3 V to 30 V or 3 V to 32 V. If your circuit operates below 3 V, only the OPA4187ID (4.5 V minimum) and OPA4234U are unsuitable; however, the OPA4187ID minimum is 4.5 V, making it incompatible with sub-3V applications. If your circuit operates above 30 V, the LM2902DT and LM324DT (32 V maximum) or OPA4187ID and OPA4234U (36 V maximum) are required.

Q8: Are automotive-qualified variants available?

Yes, the LM2902AWYDT, LM2902WYDT, and LM2902YDT are qualified to AEC-Q100 automotive standards, making them suitable for automotive and harsh-environment applications requiring enhanced reliability qualification.

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