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OPA2234MDR Equivalent & Substitute Parts
Part Overview
The OPA2234MDR is a general-purpose operational amplifier manufactured by Texas Instruments, featuring dual circuits in an 8-SOIC surface-mount package. This device is classified as obsolete, which necessitates identification of active alternative components for new designs and ongoing production requirements. The OPA2234MDR operates across a wide supply voltage range of 2.7V to 36V and maintains performance across the industrial temperature range of -55°C to 125°C. Due to its obsolete status, equivalent and substitute parts with active product status are required for design continuity and component availability.
Substiute Parts
Key Parameters
| Parameter | OPA2234MDR | Unit |
|---|---|---|
| Manufacturer | Texas Instruments | — |
| Product Status | Obsolete | — |
| 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 | 15 | nA |
| Voltage - Input Offset | 40 | µV |
| Current - Supply | 250 (x2 Channels) | µA |
| Current - Output / Channel | 11 | mA |
| Voltage - Supply Span (Min) | 2.7 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | -55°C ~ 125°C | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | — |
Substitute Part Grouping Explanation
Substitution of the OPA2234MDR is determined by the following critical parameters:
Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface-mount package to ensure direct PCB compatibility without layout modifications.
Electrical Specifications: Substitute parts must maintain functional equivalence within the following ranges:
- Slew Rate: 0.2V/µs or greater
- Gain Bandwidth Product: 350 kHz or greater
- Input Bias Current: 15 nA or lower
- Input Offset Voltage: 40 µV or lower
- Supply Voltage Range: Minimum 2.7V to 3V; Maximum 30V to 36V
- Output Current per Channel: 11 mA or greater
- Operating Temperature: Must support -55°C to 125°C or equivalent industrial range
Circuit Configuration: All substitute parts must feature dual operational amplifier circuits (2 circuits per package).
Compliance Requirements: All substitute parts must maintain ROHS3 compliance and EAR99 export classification.
The substitute parts listed below meet these criteria with varying performance enhancements and product status classifications.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Slew Rate (V/µs) | GBW (kHz) | Input Bias (nA) | Input Offset (µV) | Supply Min (V) | Supply Max (V) | Output Current (mA) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|
| OPA2234MDR | Texas Instruments | Obsolete | 0.2 | 350 | 15 | 40 | 2.7 | 36 | 11 | -55 ~ 125 | 8-SOIC |
| ISL28208FBZ-T7A | Renesas Electronics | Active | 0.45 | 1200 | 13 | 25 | 3 | 40 | 30 | -40 ~ 125 | 8-SOIC |
| LM158DT | STMicroelectronics | Active | 0.6 | 1100 | 20 | 5000 | 3 | 30 | 40 | -55 ~ 125 | 8-SOIC |
| LM258ADT | STMicroelectronics | Active | 0.6 | 1100 | 20 | 1000 | 3 | 30 | 40 | -40 ~ 105 | 8-SOIC |
| LM258DT | STMicroelectronics | Active | 0.6 | 1100 | 20 | 5000 | 3 | 30 | 40 | -40 ~ 105 | 8-SOIC |
| LM2904AYDT | STMicroelectronics | Active | 0.6 | 1100 | 20 | 1000 | 3 | 30 | 40 | -40 ~ 125 | 8-SOIC |
| LM2904DT | Rohm Semiconductor | Not For New Designs | 0.3 | 700 | 20 | 1000 | 3 | 32 | 30 | -40 ~ 125 | 8-SOIC |
| LM2904YDT | STMicroelectronics | Active | 0.6 | 700 | 20 | 2000 | 3 | 30 | 30 | -40 ~ 125 | 8-SOIC |
| LM358ADT | STMicroelectronics | Active | 0.6 | 1100 | 20 | 1000 | 3 | 30 | 40 | 0 ~ 70 | 8-SOIC |
| LM358DT | Rohm Semiconductor | Obsolete | 0.3 | 800 | 20 | 1000 | 3 | 32 | 30 | -40 ~ 85 | 8-SOIC |
| LT2078ACS8#PBF | Analog Devices Inc. | Active | 0.07 | 200 | 6 | 50 | 2.2 | 36 | — | 0 ~ 70 | 8-SOIC |
Engineering Selection Recommendations
Primary Recommendation for Active Production:
ISL28208FBZ-T7A (Renesas Electronics Corporation) is the preferred substitute for new designs. This part maintains active product status, offers superior performance specifications including higher slew rate (0.45V/µs vs. 0.2V/µs), increased gain bandwidth product (1.2 MHz vs. 350 kHz), and enhanced output current capability (30 mA vs. 11 mA). The ISL28208FBZ-T7A features rail-to-rail output configuration and operates across an extended supply voltage range (3V to 40V). Moisture sensitivity level is improved to MSL 2 (1 Year) compared to the original MSL 3 (168 Hours). This part is ROHS3 compliant and maintains EAR99 classification.
Secondary Recommendations for Existing Designs:
LM2904AYDT (STMicroelectronics) provides direct functional compatibility with active product status and automotive-grade qualification (AEC-Q100). Operating temperature range extends to -40°C to 125°C, matching the original device's lower temperature limit. This part was explicitly listed as a substitute in the original OPA2234MDR documentation.
LM258ADT (STMicroelectronics) offers active status with automotive qualification. Input offset voltage is reduced to 1 mV, and output current is increased to 40 mA. Operating temperature range is -40°C to 105°C. This part was also listed in the original substitute documentation.
LM158DT (STMicroelectronics) maintains the full industrial temperature range (-55°C to 125°C) matching the original device and includes automotive-grade qualification (AEC-Q100). Slew rate is increased to 0.6V/µs and gain bandwidth product to 1.1 MHz.
Parts to Avoid for New Designs:
LM358DT (Rohm Semiconductor) and LM2904DT (Rohm Semiconductor) carry obsolete or "Not For New Designs" status and should not be selected for new production applications.
LT2078ACS8#PBF (Analog Devices Inc.) operates at reduced temperature range (0°C to 70°C) and is not suitable for applications requiring the full -55°C to 125°C industrial range of the original device.
Frequently Asked Questions (FAQ)
Q: Can the ISL28208FBZ-T7A directly replace the OPA2234MDR without PCB modifications?
A: Yes. Both devices use the 8-SOIC (0.154", 3.90mm Width) surface-mount package with identical pinout compatibility. No PCB layout changes are required. However, the ISL28208FBZ-T7A features rail-to-rail output, which may improve performance in applications operating near supply rail limits.
Q: What is the primary reason the OPA2234MDR is obsolete?
A: The OPA2234MDR is classified as obsolete by Texas Instruments. Active substitute parts with equivalent or superior performance characteristics are available from multiple manufacturers, including STMicroelectronics, Renesas Electronics, and Analog Devices.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed in this document maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the original OPA2234MDR.
Q: Which substitute part offers the best performance improvement?
A: The ISL28208FBZ-T7A provides the most significant performance enhancement, with slew rate increased to 0.45V/µs (2.25× improvement), gain bandwidth product increased to 1.2 MHz (3.4× improvement), and output current increased to 30 mA (2.7× improvement). This part is recommended for applications requiring enhanced dynamic performance.
Q: Can I use LM358ADT in applications requiring the full -55°C to 125°C temperature range?
A: No. The LM358ADT operates only from 0°C to 70°C. For applications requiring -55°C to 125°C operation, select LM158DT, LM2904AYDT, or LM2904YDT instead.
Q: What is the difference between LM258ADT and LM258DT?
A: Both parts are manufactured by STMicroelectronics and use the 8-SOIC package. The primary difference is input offset voltage: LM258ADT specifies 1 mV maximum, while LM258DT specifies 5 mV maximum. Both operate from -40°C to 105°C. Select LM258ADT for applications requiring tighter offset voltage specifications.
Q: Is automotive qualification (AEC-Q100) required for my application?
A: Automotive qualification is not required for all applications. However, AEC-Q100 qualified parts (LM158DT, LM258ADT, LM2904AYDT, LM2904YDT) undergo additional reliability testing and are recommended for mission-critical or high-reliability applications. Non-automotive parts may be suitable for general industrial and consumer applications.
Q: What does "Not For New Designs" status mean?
A: Parts marked "Not For New Designs" are in transition toward obsolescence. While they may still be available from inventory, manufacturers do not recommend their use in new product development. These parts should be used only for sustaining production of existing designs. For new designs, select parts with "Active" product status.
Q: Can I substitute multiple different part numbers within the same PCB assembly?
A: Yes, provided all selected parts meet the electrical and thermal requirements of your application. However, for manufacturing consistency and supply chain simplification, using a single substitute part number across all units is recommended.
Q: What is the significance of Moisture Sensitivity Level (MSL)?
A: MSL indicates the maximum time a component can be stored in ambient conditions (typically 30°C, 85% relative humidity) before soldering. The OPA2234MDR specifies MSL 3 (168 hours). Most substitute parts specify MSL 1 (Unlimited), which provides greater flexibility in storage and handling. Lower MSL values reduce the risk of moisture-induced soldering defects.
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