OPA4234UG4 Equivalent & Substitute Parts

Part Overview

The OPA4234UG4 is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface-mount package, manufactured by Texas Instruments. This device is classified as obsolete, indicating it has been discontinued and is no longer recommended for new designs. The OPA4234UG4 operates across a wide supply voltage range of 2.7V to 36V with an operating temperature range of -40°C to 125°C, making it suitable for diverse industrial and consumer applications.

Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production support, and long-term component availability. Substitute parts must maintain functional compatibility while meeting the same electrical and mechanical specifications required for direct replacement or circuit redesign.

Key Parameters

Parameter	OPA4234UG4
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	0.2V/µs
Gain Bandwidth Product	350 kHz
Current - Input Bias	12 nA
Voltage - Input Offset	70 µV
Current - Supply	275µA (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
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the OPA4234UG4 are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Primary Compatibility Criteria:

Number of Circuits: Must be 4 independent amplifier circuits
Package / Case: Must be 14-SOIC (0.154", 3.90mm Width) for direct pin-compatible replacement
Mounting Type: Must be Surface Mount
Amplifier Type: General Purpose classification
Operating Temperature Range: Must support -40°C to 125°C minimum
Supply Voltage Range: Must support the required 2.7V to 36V span or compatible subset

Secondary Electrical Parameters:

Slew Rate: 0.2V/µs or higher
Gain Bandwidth Product: 350 kHz or higher
Current - Input Bias: 12 nA or lower (lower is superior)
Voltage - Input Offset: 70 µV or lower (lower is superior)
Current - Output / Channel: 22 mA or higher
RoHS3 Compliance: Required for regulatory alignment

Substitute parts are grouped into two categories: direct pin-compatible replacements and functional equivalents with enhanced specifications. Direct replacements maintain identical pinout and package dimensions. Functional equivalents may offer improved performance characteristics while maintaining electrical compatibility within the circuit application.

Parameter Comparison

Parameter	OPA4234UG4	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 (V)	2.7	4.5	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0
Voltage - Supply Span Max (V)	36	36	30	30	30	30	32	30	30	30	32
Operating Temperature (°C)	-40 ~ 125	-40 ~ 125	-55 ~ 125	-40 ~ 105	-40 ~ 105	-40 ~ 125	-40 ~ 125	-40 ~ 125	-40 ~ 125	0 ~ 70	-40 ~ 85
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

Tier 1: Direct Pin-Compatible Replacements (Recommended for Existing Designs)

OPA4187ID is the primary recommended substitute for the obsolete OPA4234UG4. This Texas Instruments zero-drift amplifier maintains identical 14-SOIC packaging and pinout compatibility. The OPA4187ID offers superior electrical performance with significantly lower input offset voltage (1 µV versus 70 µV) and input bias current (100 pA versus 12 nA). The device is currently in active production status, ensuring long-term availability. Operating temperature range of -40°C to 125°C matches the original specification. Supply voltage range of 4.5V to 36V covers most applications within the OPA4234UG4's 2.7V to 36V range, with the exception of ultra-low voltage applications below 4.5V. RoHS3 compliance is maintained.

Tier 2: Functional Equivalents with Enhanced Performance (For New Designs)

LM2902WYDT and LM2902YDT (STMicroelectronics) provide general-purpose amplifier functionality with improved performance characteristics. Both devices feature 14-SOIC packaging and support the full -40°C to 125°C operating temperature range. These parts offer higher slew rate (0.4V/µs versus 0.2V/µs) and greater gain bandwidth product (1.3 MHz versus 350 kHz). Supply voltage range of 3V to 30V is compatible with most OPA4234UG4 applications. LM2902YDT provides higher output current capability (60 mA per channel versus 22 mA). Both devices carry AEC-Q100 automotive qualification and are in active production status.

Tier 3: Alternative General-Purpose Amplifiers (For Flexible Circuit Redesign)

LM124DT, LM224ADT, LM224DT, and LM324ADT represent alternative general-purpose four-circuit amplifiers in 14-SOIC packaging. These devices are in active production status and offer enhanced bandwidth (1.3 MHz) compared to the OPA4234UG4. Supply voltage range of 3V to 30V accommodates most applications. Operating temperature ranges vary: LM124DT supports -55°C to 125°C (extended low-temperature range), LM224ADT and LM224DT support -40°C to 105°C, and LM324ADT supports 0°C to 70°C (commercial temperature range). Selection depends on specific temperature and voltage requirements.

Tier 4: Legacy Parts (Not Recommended for New Designs)

LM2902DT (Rohm Semiconductor) and LM324DT (Rohm Semiconductor) are classified as "Not For New Designs" and should be avoided for new product development. These parts are retained in the comparison for reference only in cases where existing inventory must be utilized for legacy product support.

Selection Criteria Summary:

For direct replacement in existing designs: OPA4187ID
For new designs with enhanced performance: LM2902WYDT or LM2902YDT
For applications requiring extended temperature range: LM124DT
For commercial temperature applications: LM324ADT
All recommended substitutes maintain RoHS3 compliance and 14-SOIC packaging

Frequently Asked Questions (FAQ)

Q1: Can the OPA4187ID directly replace the OPA4234UG4 without circuit modifications?

A: Yes, the OPA4187ID is pin-compatible with the OPA4234UG4 and uses identical 14-SOIC packaging. Both devices feature four independent amplifier circuits with the same pinout. However, the OPA4187ID has a higher minimum supply voltage (4.5V versus 2.7V), so applications requiring operation below 4.5V require circuit redesign. The superior electrical characteristics of the OPA4187ID (lower offset voltage and bias current) may improve circuit performance without requiring modifications.

Q2: What is the key difference between the OPA4187ID and the LM2902 series substitutes?

A: The OPA4187ID is a zero-drift amplifier manufactured by Texas Instruments with extremely low input offset voltage (1 µV) and input bias current (100 pA). The LM2902 series are general-purpose amplifiers with higher offset voltage (1-2 mV) and bias current (20 nA). The OPA4187ID is superior for precision applications requiring minimal offset drift. The LM2902 series offers higher bandwidth (1.3 MHz versus 550 kHz) and greater output current capability, making them suitable for higher-speed applications.

Q3: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed in this document are RoHS3 compliant, matching the compliance status of the original OPA4234UG4. This ensures regulatory alignment for applications subject to RoHS directives.

Q4: Which substitute part supports the widest supply voltage range?

A: The OPA4187ID supports 4.5V to 36V, and the LM2902DT supports 3V to 32V. For applications requiring operation at 2.7V (the OPA4234UG4 minimum), none of the listed substitutes provide full compatibility. Circuit redesign or alternative component selection is necessary for ultra-low voltage applications.

Q5: What is the significance of "Product Status: Active" versus "Not For New Designs"?

A: "Active" status indicates the manufacturer continues production and supports the component for new designs. "Not For New Designs" indicates the manufacturer has discontinued active support, though existing inventory may remain available. For long-term product viability, components with "Active" status are strongly preferred.

Q6: Can I use LM324ADT in applications requiring -40°C operation?

A: No, the LM324ADT operates only from 0°C to 70°C. For applications requiring -40°C operation, select LM124DT (-55°C to 125°C), LM224ADT or LM224DT (-40°C to 105°C), or the LM2902 series (-40°C to 125°C).

Q7: Which substitute offers the highest output current per channel?

A: The LM2902YDT provides 60 mA per channel, compared to 22 mA for the OPA4234UG4. This makes the LM2902YDT suitable for applications requiring higher output drive capability.

Q8: Are there any supply voltage limitations I should consider when substituting?

A: Yes. The OPA4234UG4 operates from 2.7V to 36V. The OPA4187ID requires minimum 4.5V, and most LM series substitutes require minimum 3V. If your application operates below 3V, alternative components outside this list must be evaluated. All substitutes support the 36V maximum, so high-voltage applications are compatible.

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