OPA2234U/2K5G4 Equivalent & Substitute Parts

Part Overview

The OPA2234U/2K5G4 is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This part is classified as discontinued at DiGi Electronics, indicating it is no longer actively supported through primary distribution channels. The OPA2234U/2K5G4 remains available in inventory (2850 pcs new original in stock) but requires equivalent or substitute components for new design implementations and long-term supply assurance. Substitute parts must maintain compatibility across electrical performance parameters, mechanical packaging, and thermal operating ranges to ensure functional equivalence in existing circuit applications.

Key Parameters

Parameter	OPA2234U/2K5G4	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
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
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Product Status	Discontinued at DiGi Electronics	—

Substitute Part Grouping Explanation

Substitute parts for the OPA2234U/2K5G4 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mechanical Compatibility:

Package type: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Pin count and footprint equivalence

Electrical Compatibility:

Amplifier type: General Purpose (dual-channel configuration)
Number of circuits: 2
Supply voltage range: Minimum 2.7 V to maximum 36 V (OPA2234U/2K5G4 range)
Operating temperature range: -40°C to 125°C (OPA2234U/2K5G4 range)

Performance Parameters (Allowable Variation): Substitute parts may exhibit different slew rates, gain bandwidth products, input bias currents, and output current capabilities, provided they remain within acceptable ranges for general-purpose amplifier applications and do not degrade circuit performance below minimum functional thresholds.

Compliance & Status: All substitute parts must maintain ROHS3 compliance and be available through active distribution channels (Active product status preferred).

The substitute parts identified below satisfy these criteria and are grouped by manufacturer and product status.

Parameter Comparison

Parameter	OPA2234U/2K5G4	AD706JRZ	LM258ADT	LM258DT	LM2904YDT	Unit
Manufacturer	Texas Instruments	Analog Devices Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics	—
Number of Circuits	2	2	2	2	2	—
Slew Rate	0.2	0.15	0.6	0.6	0.6	V/µs
Gain Bandwidth Product	350	800	1.1	1.1	700	kHz
Current - Input Bias	12	50	20	20	20	pA / nA
Voltage - Input Offset	70	30	1	5	2	µV / mV
Current - Supply	275 (x2)	750	700 (x2)	700 (x2)	700	µA
Current - Output / Channel	22	15	40	40	30	mA
Voltage - Supply Span (Min)	2.7	4	3	3	3	V
Voltage - Supply Span (Max)	36	36	30	30	30	V
Operating Temperature	-40 to 125	0 to 70	-40 to 105	-40 to 105	-40 to 125	°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	—
Product Status	Discontinued	Active	Active	Active	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

Primary Substitute: LM258ADT (STMicroelectronics)

The LM258ADT is the recommended primary substitute for the OPA2234U/2K5G4. This part maintains full mechanical compatibility (8-SOIC package), operates across the required temperature range (-40°C to 105°C), and is classified as Active product status with high inventory availability (60,400 pcs). The LM258ADT carries AEC-Q100 automotive qualification and ROHS3 compliance. While the supply voltage maximum is reduced to 30 V (versus 36 V for the OPA2234U/2K5G4), this remains within acceptable limits for most general-purpose amplifier applications. The LM258ADT exhibits superior performance characteristics: higher gain bandwidth product (1.1 MHz versus 350 kHz), lower input offset voltage (1 mV versus 70 µV), and higher output current capability (40 mA versus 22 mA per channel).

Secondary Substitute: LM2904YDT (STMicroelectronics)

The LM2904YDT provides an alternative with identical operating temperature range (-40°C to 125°C) matching the OPA2234U/2K5G4. This part is Active status with substantial inventory (104,400 pcs) and carries AEC-Q100 qualification. The LM2904YDT operates at reduced maximum supply voltage (30 V) and offers a gain bandwidth product of 700 kHz, intermediate between the OPA2234U/2K5G4 and LM258ADT. Output current per channel is 30 mA, exceeding the OPA2234U/2K5G4 specification of 22 mA.

Tertiary Substitute: AD706JRZ (Analog Devices Inc.)

The AD706JRZ maintains the full supply voltage range (36 V maximum) of the OPA2234U/2K5G4 and is Active status with high inventory (18,920 pcs). However, the operating temperature range is restricted to 0°C to 70°C, which does not cover the full -40°C to 125°C range of the original part. The AD706JRZ is suitable only for applications operating within the 0°C to 70°C window. This part exhibits the highest gain bandwidth product (800 kHz) among the primary substitutes and the lowest input bias current (50 pA).

Not Recommended: LM258DT (Rohm Semiconductor)

The LM258DT is classified as "Not For New Designs" and should not be selected for new circuit implementations, despite meeting mechanical and electrical compatibility criteria.

Frequently Asked Questions (FAQ)

Q1: Can the LM258ADT directly replace the OPA2234U/2K5G4 in existing circuits?

The LM258ADT is mechanically and functionally compatible with the OPA2234U/2K5G4 in 8-SOIC package applications. However, the maximum supply voltage is reduced from 36 V to 30 V. Verify that your circuit operates at or below 30 V supply voltage. The LM258ADT offers superior electrical performance (higher bandwidth, lower offset voltage, higher output current), making it suitable for direct substitution in most general-purpose amplifier applications.

Q2: What is the key difference between the LM258ADT and LM2904YDT?

Both parts are dual-channel general-purpose amplifiers in 8-SOIC packages from STMicroelectronics. The LM258ADT provides higher gain bandwidth product (1.1 MHz versus 700 kHz) and lower input offset voltage (1 mV versus 2 mV). The LM2904YDT matches the full operating temperature range of the OPA2234U/2K5G4 (-40°C to 125°C), while the LM258ADT is limited to -40°C to 105°C. Select LM2904YDT if full temperature range coverage is required; select LM258ADT for applications requiring higher bandwidth performance.

Q3: Why is the AD706JRZ not recommended as a primary substitute?

The AD706JRZ operating temperature range (0°C to 70°C) does not cover the full -40°C to 125°C specification of the OPA2234U/2K5G4. This part is suitable only for applications operating within the restricted 0°C to 70°C window. For applications requiring the full temperature range, select LM258ADT or LM2904YDT instead.

Q4: Are all substitute parts ROHS3 compliant?

Yes. All substitute parts identified in this reference (AD706JRZ, LM258ADT, LM258DT, LM2904YDT) are ROHS3 compliant and meet environmental regulatory requirements equivalent to the OPA2234U/2K5G4.

Q5: What is the significance of AEC-Q100 qualification on the LM258ADT and LM2904YDT?

AEC-Q100 qualification indicates that these parts meet automotive-grade reliability and performance standards established by the Automotive Electronics Council. This qualification provides additional assurance of component quality and consistency, making these parts suitable for both commercial and automotive applications.

Q6: Can I use the LM258DT as a substitute?

The LM258DT meets mechanical and electrical compatibility requirements but is classified as "Not For New Designs" by the manufacturer. This designation indicates the part is in end-of-life status and should not be selected for new circuit implementations. Use LM258ADT or LM2904YDT instead.

Q7: What happens if my circuit requires operation above 30 V supply voltage?

If your application requires supply voltages between 30 V and 36 V, the AD706JRZ is the only substitute that maintains the full 36 V maximum rating. However, the AD706JRZ operating temperature range is limited to 0°C to 70°C. Verify that your application operates within this temperature window before selecting the AD706JRZ.

Q8: Are there any differences in pin configuration between the OPA2234U/2K5G4 and the substitute parts?

All substitute parts use the standard 8-SOIC package with identical pin assignments for dual-channel general-purpose amplifier configurations. No PCB layout modifications are required for direct substitution.

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