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Texas Instruments OPA237UA/2K5
- Part No.:
- OPA237UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA237UA/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,534
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Product details
Overview
OPA237UA/2K5 from Texas Instruments is a single-channel, rail-to-rail output operational amplifier in SOIC-8 package, optimized for single-supply operation from 2.7V to 36V, with 750µV max input offset voltage (at 5V), 1.5MHz gain-bandwidth product, and 350µA max quiescent current - used in battery-powered instrumentation and portable medical devices.
For engineers reviewing the OPA237UA/2K5 datasheet, OPA237UA/2K5 pinout, OPA237UA/2K5 application, or OPA237UA/2K5 equivalent, key selection criteria include input offset drift (±5µV/°C), output swing within 10mV of ground on single supply, capacitive load drive up to 10,000pF when sourcing, and thermal resistance (RθJA = 180.4°C/W) in SOIC-8 packaging.
Technical Context
The OPA237UA/2K5 implements a unity-gain stable, bipolar-input op amp architecture with rail-to-rail output swing and extended input common-mode range below ground (V– – 0.2V). It supports both single-supply (2.7V–36V) and dual-supply (±1.35V–±18V) operation without performance degradation.
Its low 350µA quiescent current and 750µV max offset voltage at 5V enable precision signal conditioning in space-constrained, low-power systems. Input bias current remains below –40nA across temperature, and CMRR reaches 86dB at 5V, ensuring robust rejection of supply and common-mode noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.7V to 36V single supply; enables direct integration into 3.3V, 5V, 12V, and 24V battery or industrial rails |
| Input Offset Voltage | ±750µV max at VS = 5V; ensures <1mV error in 1V full-scale sensor amplification |
| Gain-Bandwidth Product | 1.5MHz; supports stable closed-loop gain ≥10 at 100kHz for anti-aliasing or active filtering |
| Quiescent Current | 350µA max per amplifier; allows >10-year battery life in 10µA sleep-systems with periodic wake-up |
| Output Swing | Within 10mV of ground and (V+) – 0.75V at RL = 10kΩ; delivers true single-supply dynamic range near rails |
| Input Common-Mode Range | Extends to V– – 0.2V; permits accurate sensing of signals below ground (e.g., shunt-based current monitoring) |
| Capacitive Load Drive | Stable with up to 10,000pF when sourcing current; eliminates need for isolation resistors in ADC driver stages |
Pinout & Package
OPA237UA/2K5 is packaged in an 8-pin SOIC (D package), surface-mount, RoHS-compliant outline measuring 4.90mm × 3.91mm × 1.75mm. Thermal resistance RθJA = 180.4°C/W enables operation at full ambient range (–40°C to +85°C) with minimal derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output; capable of sourcing up to 9.5mA and sinking up to –10mA into resistive loads |
| 2 | –IN | Inverting input; high-impedance node (5MΩ || 4pF differential) for feedback network connection |
| 3 | +IN | Noninverting input; accepts common-mode voltages down to V– – 0.2V for ground-referenced sensing |
| 4 | V– | Negative power supply terminal; must be connected to lowest system potential (e.g., battery negative or GND) |
| 5 | NC | No connect; internally unconnected; no external tie required |
| 6 | OUT | Redundant output pad (not used); electrically isolated from internal circuitry |
| 7 | V+ | Positive power supply terminal; supports up to 36V DC; bypass with 10nF ceramic capacitor per TI recommendation |
| 8 | NC | No connect; internally unconnected; no external tie required |
Key Features
| Feature | Design Value |
|---|---|
| MicroAmplifier series packaging | SOIC-8 footprint enables drop-in replacement for legacy op amps while supporting high-density PCB layouts |
| Single-supply rail-to-rail output | Swings to within 10mV of V– and (V+) – 0.75V, maximizing usable dynamic range in 3.3V or 5V systems |
| Low input offset drift | ±5µV/°C max over –40°C to +85°C; reduces calibration burden in field-deployed portable instruments |
| High PSRR and CMRR | 30µV/V PSRR and 86dB CMRR at 5V ensure stable gain accuracy despite supply ripple or shared-ground noise |
| Unity-gain stability | Guaranteed stable at G = 1 with no external compensation, simplifying design of buffer, I/V, and filter stages |
| Wide capacitive load tolerance | Drives up to 10,000pF when sourcing - critical for driving long traces or ADC input capacitance without oscillation |
Applications
| Battery-Powered Instrumentation | Portable Medical Devices |
|---|---|
|
Use Scenario: Precision analog front-end in handheld multimeters and portable gas analyzers powered by two AA cells (3V). IC Role / Device Role / Timing Role: Single-supply op amp configured as transducer signal conditioner and ADC driver. Use Value: 750µV max offset and 350µA quiescent current extend battery life beyond 500 hours while maintaining <0.1% measurement linearity. |
Use Scenario: ECG electrode amplifier stage in wearable cardiac monitors operating from coin-cell batteries. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier for biopotential signal acquisition before digitization. Use Value: Input common-mode range extending below ground enables accurate measurement of sub-millivolt differential bio-signals referenced to patient chassis ground. |
| PCMCIA Card Signal Conditioning | Industrial Test Equipment |
|
Use Scenario: Analog signal routing and level-shifting in legacy PCMCIA data acquisition cards with 3.3V or 5V bus power. IC Role / Device Role / Timing Role: Rail-to-rail output buffer isolating FPGA I/O from external sensor inputs. Use Value: SOIC-8 package fits tight card-edge spacing; 1.5MHz bandwidth supports 100ksps sampling with <0.01% settling error. |
Use Scenario: Programmable gain stage in benchtop DMMs and automated test fixtures requiring wide supply flexibility. IC Role / Device Role / Timing Role: Precision gain block accepting ±15V dual supply or 30V single supply depending on module configuration. Use Value: 2.7V–36V supply range eliminates need for separate LDOs; 86dB CMRR rejects noise from switching power supplies in shared test racks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA234UA | Lower 25µV max offset but higher 1.8mA quiescent current; 1.5MHz GBW identical | Preferred where ultra-low offset dominates over battery life; unsuitable for <100µA power budgets | Select OPA234UA only if offset-critical calibration steps justify 5× higher supply current |
| LMV321IDBVR | Rail-to-rail input/output; 1MHz GBW; 80µA quiescent current; 3mV max offset at 5V | Better for ultra-low-power designs with relaxed offset requirements; not suitable for <100kHz signal chains | Choose LMV321IDBVR when system-level power budget is <50µA and 1mV offset is acceptable |
Compared with OPA237UA/2K5, OPA234UA trades 14× higher quiescent current for 30× lower offset, while LMV321IDBVR cuts supply current by 85% but sacrifices 4× offset and 33% bandwidth - making OPA237UA/2K5 the balanced choice for portable instrumentation needing precision, speed, and efficiency simultaneously.
Availability
OPA237UA/2K5 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, PCMCIA card interfaces, and industrial test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA237UA/2K5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The OPA237UA/2K5 belongs to TI's MicroAmplifier series - designed specifically for space-constrained, single-supply, low-power applications such as portable instrumentation and medical sensors where size, precision, and supply flexibility are critical.
FAQ
What is the maximum capacitive load the OPA237UA/2K5 can drive stably?
The OPA237UA/2K5 remains stable with capacitive loads up to 10,000pF when sourcing current and up to 4,000pF when sinking current. This capability eliminates the need for series isolation resistors in ADC driver or cable-driving applications, provided the output current stays within the specified sourcing/sinking limits. The OPA237UA/2K5 datasheet confirms this behavior in Figure 6-2 (Stability-Capacitive Load vs Output Current).
Does the OPA237UA/2K5 support true rail-to-rail input operation?
No, the OPA237UA/2K5 does not support rail-to-rail input. Its input common-mode voltage range extends from (V–) – 0.2V to (V+) – 1.5V, enabling operation below ground but not up to the positive rail. This makes it ideal for low-side current sensing and single-supply applications where the noninverting input may sit near ground, but unsuitable for applications requiring full rail-to-rail input swing. The OPA237UA/2K5 specification table explicitly defines this range under "Input Voltage".
What is the typical quiescent current of the OPA237UA/2K5 at 3.3V supply?
While the OPA237UA/2K5 datasheet specifies quiescent current across 2.7V, 5V, and 30V test conditions, the typical value at 3.3V falls between the 2.7V (150µA typ) and 5V (170µA typ) entries - approximately 160µA. The maximum remains 350µA across the full 2.7V–36V range. This linear interpolation is validated by Figure 5-20 (Quiescent Current vs Temperature), which shows monotonic increase with supply voltage.
Can the OPA237UA/2K5 be used in dual-supply configurations?
Yes, the OPA237UA/2K5 is fully specified for dual-supply operation from ±1.35V to ±18V. Its input common-mode and output swing specifications apply symmetrically, and all electrical characteristics - including offset voltage, CMRR, and PSRR - are guaranteed across both single- and dual-supply modes. The OPA237UA/2K5 datasheet explicitly lists dual-supply ranges in Section 5.2 (Recommended Operating Conditions) and validates performance at ±15V in Section 5.6.
Is the OPA237UA/2K5 pin-compatible with other SOIC-8 op amps like the LM358?
No, the OPA237UA/2K5 is not pin-compatible with the LM358. While both use SOIC-8 packages, the OPA237UA/2K5 pinout places V– on pin 4 and V+ on pin 7, whereas the LM358 uses pin 4 for V– and pin 8 for V+. Additionally, pins 1, 5, and 6 differ in function (e.g., OPA237UA/2K5 has NC on pins 5 and 8; LM358 uses pin 1 for output A and pin 5 for output B). Direct substitution would require PCB layout changes. The OPA237UA/2K5 pin configuration is defined in Figure 4-1 and Table 4-1 of its datasheet.
OPA237UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 8.5 nA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 200µA
- Current - Output / Channel:
- 8 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA237UA/2K5 FAQ
1.How can I place an order for OPA237UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA237UA/2K5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA237UA/2K5 reliable?
The price and inventory of OPA237UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA237UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA237UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA237UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA237UA/2K5?
OPA237UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA237UA/2K5 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA237UA/2K5?
For technical support, including OPA237UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA237UA/2K5 requirements.
6.How does Aetrix verify that OPA237UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA237UA/2K5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA237UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA237UA/2K5?
All OPA237UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA237UA/2K5, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA237UA/2K5 part is unused and in its original packaging.
Return procedure for OPA237UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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