OPA2234UG4 Equivalent & Substitute Parts

Part Overview

The OPA2234UG4 is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a dual-circuit (2-channel) device in an 8-SOIC surface-mount package. This component is classified as obsolete, indicating it has been discontinued and is no longer recommended for new designs. The OPA2234UG4 features a slew rate of 0.2V/µs, gain bandwidth product of 350 kHz, and operates across a supply voltage range of 2.7V to 36V with an operating temperature range of -40°C to 125°C.

Due to its obsolete status, identifying functionally equivalent substitute parts is essential for maintaining design continuity, supporting legacy systems, and ensuring component availability for production and repair applications. Substitute parts must maintain compatibility across critical electrical parameters including supply voltage range, number of circuits, package type, and thermal operating range.

Key Parameters

Parameter	OPA2234UG4 Value	Unit
Manufacturer	Texas Instruments	—
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Slew Rate	0.2	V/µs
Gain Bandwidth Product	350	kHz
Current - Input Bias	12	nA
Voltage - Input Offset	70	µV
Current - Supply	275 (x2 Channels)	µA
Current - Output / Channel	22	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 125	°C
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the OPA2234UG4 are selected based on strict compatibility across the following critical parameters:

Primary Compatibility Criteria:

Number of circuits: 2 (dual-channel configuration)
Package type: 8-SOIC surface-mount
Supply voltage range: Minimum 2.7V to maximum 36V (or compatible subset)
Operating temperature range: -40°C to 125°C (or compatible subset)
Mounting type: Surface Mount

Secondary Electrical Parameters:

Slew rate: 0.2V/µs or higher
Gain bandwidth product: 350 kHz or higher
Input bias current: 12 nA or lower
Input offset voltage: 70 µV or lower
Output current per channel: 22 mA or higher
Supply current: 275 µA or lower per channel

Substitute parts are grouped into two categories: direct functional equivalents (OPA2187ID) and general-purpose alternatives (AD706 series, LM258 series, LM2904 series, LM158DT). All substitute parts maintain the 8-SOIC package format and dual-circuit configuration. Parts are listed with their current product status and compliance certifications.

Parameter Comparison

Parameter	OPA2234UG4	OPA2187ID	AD706JRZ	LM258ADT	LM258DT	LM2904DT	LM2904YDT
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	STMicroelectronics	STMicroelectronics	Rohm Semiconductor	STMicroelectronics
Amplifier Type	General Purpose	Zero-Drift	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	2	2	2	2	2	2	2
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Slew Rate (V/µs)	0.2	0.2	0.15	0.6	0.6	0.3	0.6
Gain Bandwidth Product (kHz)	350	550	800	1100	1100	700	700
Current - Input Bias (nA)	12	0.1	0.05	20	20	20	20
Voltage - Input Offset (µV)	70	1	30	1000	5000	1000	2000
Current - Supply (µA)	275 (x2)	100 (x2)	750	700 (x2)	700 (x2)	600	700
Current - Output / Channel (mA)	22	30	15	40	40	30	30
Voltage - Supply Span Min (V)	2.7	4.5	4	3	3	3	3
Voltage - Supply Span Max (V)	36	36	36	30	30	32	30
Operating Temperature (°C)	-40 to 125	-40 to 125	0 to 70	-40 to 105	-40 to 105	-40 to 125	-40 to 125
Product Status	Obsolete	Active	Active	Active	Active	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

OPA2187ID (Texas Instruments, Active Status)

The OPA2187ID is a zero-drift amplifier offering superior input offset voltage performance (1 µV versus 70 µV) while maintaining the same 8-SOIC package and dual-circuit configuration. It operates across the full 4.5V to 36V supply range and -40°C to 125°C temperature range. The OPA2187ID is actively manufactured and ROHS3 compliant. This part is suitable for applications requiring lower offset voltage and higher precision. The minimum supply voltage is 4.5V, which may require circuit redesign if 2.7V operation is required.

AD706JRZ and AD706JRZ-REEL (Analog Devices Inc., Active Status)

The AD706 series (both tube and reel packaging variants) provides general-purpose amplification with higher gain bandwidth product (800 kHz) and lower input bias current (50 pA). Both variants are actively manufactured and ROHS3 compliant. The operating temperature range is 0°C to 70°C, which is narrower than the OPA2234UG4. The minimum supply voltage is 4V. These parts are suitable for applications operating within the 0°C to 70°C temperature window and 4V to 36V supply range.

LM258ADT and LM258DT (STMicroelectronics, Active Status)

The LM258 series offers higher slew rate (0.6V/µs) and gain bandwidth product (1.1 MHz) compared to the OPA2234UG4. Both variants are actively manufactured with AEC-Q100 automotive qualification. The LM258ADT operates from -40°C to 105°C, while the LM258DT operates from -40°C to 105°C. Supply voltage range is 3V to 30V. These parts are suitable for automotive-grade applications and designs requiring faster slew rates. The maximum supply voltage is 30V, which is lower than the OPA2234UG4's 36V maximum.

LM2904YDT (STMicroelectronics, Active Status)

The LM2904YDT is an actively manufactured general-purpose amplifier with AEC-Q100 automotive qualification. It operates from -40°C to 125°C and 3V to 30V supply range. Slew rate is 0.6V/µs and gain bandwidth product is 700 kHz. This part is suitable for automotive applications requiring the full -40°C to 125°C temperature range. The maximum supply voltage is 30V.

LM2904DT (Rohm Semiconductor, Not For New Designs)

The LM2904DT is marked as "Not For New Designs" and should be avoided for new development. It is listed for reference only in legacy system support scenarios.

LM158DT (STMicroelectronics, Active Status)

The LM158DT is an actively manufactured general-purpose amplifier with differential output type and AEC-Q100 automotive qualification. It operates from -55°C to 125°C and 3V to 30V supply range. Slew rate is 0.6V/µs and gain bandwidth product is 1.1 MHz. This part is suitable for automotive applications requiring extended low-temperature operation to -55°C.

Frequently Asked Questions (FAQ)

Q: Can the OPA2187ID directly replace the OPA2234UG4 in all applications?

A: The OPA2187ID maintains package compatibility (8-SOIC) and dual-circuit configuration. However, the minimum supply voltage is 4.5V compared to 2.7V for the OPA2234UG4. If your circuit operates below 4.5V, the OPA2187ID cannot be used without circuit modification. The OPA2187ID offers superior input offset voltage (1 µV versus 70 µV), which may require recalibration of precision circuits.

Q: What is the key difference between the OPA2187ID and the AD706JRZ?

A: The OPA2187ID is a zero-drift amplifier with 1 µV input offset voltage and operates from 4.5V to 36V. The AD706JRZ is a general-purpose amplifier with 30 µV input offset voltage and operates from 4V to 36V. The AD706JRZ has higher gain bandwidth product (800 kHz versus 550 kHz). The OPA2187ID is better for precision applications; the AD706JRZ is better for general-purpose applications requiring higher bandwidth.

Q: Why do the LM258 series parts have a maximum supply voltage of 30V instead of 36V?

A: The LM258 series is designed for a different voltage range specification. Applications requiring operation above 30V must use alternative parts such as the OPA2187ID or AD706 series, which support 36V maximum supply voltage.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant, matching the compliance status of the OPA2234UG4.

Q: Which substitute part is best for automotive applications?

A: The LM258ADT, LM258DT, LM2904YDT, and LM158DT all carry AEC-Q100 automotive qualification. The LM158DT extends the low-temperature range to -55°C. The LM258 series and LM2904YDT operate to -40°C. Select based on your specific temperature and performance requirements.

Q: Can I use the LM2904DT as a substitute?

A: The LM2904DT is marked "Not For New Designs" by the manufacturer. It should only be used for legacy system support or repair of existing equipment. For new designs, use LM2904YDT instead.

Q: What is the impact of using a substitute with higher slew rate?

A: Higher slew rate (such as 0.6V/µs in the LM258 series versus 0.2V/µs in the OPA2234UG4) allows faster output voltage transitions. This may affect circuit stability, noise performance, and power consumption. Verify circuit performance through testing if slew rate differs significantly.

Q: Do all substitute parts use the same 8-SOIC package?

A: Yes, all substitute parts listed use the 8-SOIC (0.154", 3.90mm Width) surface-mount package, ensuring PCB layout compatibility with the OPA2234UG4.

Q: What should I do if my application requires operation below 4V supply voltage?

A: The OPA2234UG4 operates from 2.7V minimum. Most substitute parts operate from 3V or 4V minimum. If your application requires 2.7V operation, the OPA2187ID (4.5V minimum) and AD706 series (4V minimum) are not suitable. Verify that your circuit can operate at the higher minimum voltage of available substitutes, or consider alternative amplifier families.

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