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Texas Instruments OPA728AIDRBR
- Part No.:
- OPA728AIDRBR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
OPA728AIDRBR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,543
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Product details
Overview
OPA728AIDRBR from Texas Instruments is a single-channel, e-trim™ high-precision CMOS operational amplifier with shutdown functionality, 20MHz gain-bandwidth, 30V/µs slew rate, and 150µV max input offset voltage. It operates from 4V to 12V supply, delivers rail-to-rail output swing within 150mV of rails, and targets transimpedance amplifiers in optical networking and precision A/D converter drivers.
For engineers reviewing the OPA728AIDRBR datasheet, OPA728AIDRBR pinout, OPA728AIDRBR application, or OPA728AIDRBR equivalent, key selection criteria include its 6µA shutdown quiescent current, REF pin for logic-compatible enable control, DFN-8 thermal performance (θJA = 46°C/W), and guaranteed operation from –40°C to +125°C.
Technical Context
The OPA728AIDRBR uses e-trim™ technology - digital trimming performed post-packaging - to achieve 150µV max offset and 1.5µV/°C max drift, avoiding stress-induced parameter shifts. Its CMOS input stage delivers 500pA max bias current and 6nV/√Hz input voltage noise at 100kHz.
It features an AB output stage enabling rail-to-rail output swing (150mV from rails into 100kΩ), stable unity-gain operation, and integrated shutdown with REF pin referenced to V–. The enable logic threshold is defined relative to REF: >VREF+2V for active,
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 20MHz - supports stable unity-gain buffer and high-speed filter designs up to ~10MHz closed-loop bandwidth. |
| Input Offset Voltage (max) | 150µV - enables sub-16-bit error budget in precision sensor signal chains without external trimming. |
| Slew Rate | 30V/µs - ensures <450ns settling to 0.01% for 5V step, suitable for driving fast 16-bit ADCs like ADS8342. |
| Quiescent Current (active) | 4.3mA per channel - balances low power with high ac performance for battery-operated instrumentation. |
| Shutdown Current | 6µA typical - reduces system standby power by >99.8%, critical for always-on optical monitoring nodes. |
| Supply Voltage Range | 4V to 12V - supports single-supply industrial systems (e.g., 5V, 12V rails) and ±2V to ±6V dual supplies. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial process control, and base station environments. |
Pinout & Package
OPA728AIDRBR is housed in an 8-pin DFN (DRB) package with exposed thermal die pad on underside, requiring connection to V– for optimal thermal and electrical performance. Package dimensions: 3.0mm × 3.0mm × 0.8mm, pitch 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Enable) | Shutdown control input | Logic-level enable referenced to REF pin; internal pull-up ensures default-active if left floating. |
| 2 (V+) | Positive supply | Accepts 4V–12V single supply or +2V–+6V in dual-supply configurations. |
| 3 (OUT) | Amplifier output | Rail-to-rail capable: swings to within 150mV of V+ or V– into 100kΩ load while maintaining >110dB AOL. |
| 4 (NC) | No internal connection | Unbonded pad; must be left unconnected or tied to V– for mechanical stability (not electrically required). |
| 5 (REF) | Enable reference voltage | Reference point for Enable pin; connect to V– in dual-supply systems to avoid level-shifting logic signals. |
| 6 (–IN) | Inverting input | CMOS input with 1011Ω||4pF impedance; supports true single-supply operation with common-mode range to GND. |
| 7 (+IN) | Non-inverting input | Same high-impedance CMOS node; used for precision buffer, active filter, or I/V conversion summing junctions. |
| 8 (V–) | Negative supply / ground | Must connect exposed thermal die pad to this pin; serves as return path for shutdown current and output sink. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ post-package trimming | Eliminates molding-induced offset drift, delivering 150µV max VOS and 1.5µV/°C max dVOS/dT over full temperature range. |
| Shutdown with REF-referenced logic | Enables direct interface to standard CMOS logic (e.g., microcontroller GPIO) without level shifters in dual-supply systems. |
| Rail-to-rail output stage | Delivers full dynamic range in single-supply systems: 150mV headroom into light loads preserves >16-bit SNR in ADC driver applications. |
| Low-noise CMOS input | 6nV/√Hz at 100kHz and 500pA max IB enable high-gain, low-capacitance photodiode transimpedance amplifiers with minimal noise contribution. |
| DFN-8 thermal performance | θJA = 46°C/W enables >100mW dissipation at +125°C ambient - critical for sustained high-output-swing operation in compact enclosures. |
Applications
| Optical Power Monitoring | High-Speed Precision ADC Driver |
|---|---|
|
Use Scenario: Monitoring received optical power in ONET-compliant SFP modules using PIN photodiodes. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with gain up to 10MΩ. Use Value: 500pA max bias current prevents diode loading; 20MHz GBW supports >10Mbps data recovery; 6µA shutdown extends module sleep mode battery life. |
Use Scenario: Driving the analog input of 16-bit SAR ADCs (e.g., ADS8342) in automated test equipment. IC Role / Device Role / Timing Role: Unity-gain buffer isolating ADC input capacitance and charge injection spikes. Use Value: 450ns 0.01% settling time meets 600ns acquisition window; rail-to-rail output maximizes ADC full-scale utilization. |
| Single-Supply Active Filters | Industrial Process Control Signal Conditioning |
|
Use Scenario: 4th-order Butterworth low-pass filtering (50kHz cutoff) in portable medical sensors. IC Role / Device Role / Timing Role: Gain stage in Sallen-Key topology with precise dc accuracy and wide bandwidth. Use Value: 150µV max offset avoids filter DC gain error; 20MHz GBW ensures phase margin >60° across entire passband. |
Use Scenario: Amplifying low-level thermocouple or strain gauge outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with programmable gain and cold-junction compensation. Use Value: 1.5µV/°C max drift minimizes temperature-induced calibration drift; –40°C to +125°C rating supports DIN-rail mounted enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA727AIDRBT | No shutdown function; identical offset (150µV max), bandwidth (20MHz), and DFN-8 package. | Used where continuous operation is required and power cycling is managed externally. | Select OPA727AIDRBT when shutdown logic adds unnecessary complexity and 4.3mA quiescent current is acceptable. |
| OPA2727AIDRBR | Dual-channel version in same DFN-8 package; shares all specs except channel count and pinout. | Preferred in space-constrained dual-path systems (e.g., differential sensor interfaces, stereo audio preamps). | Choose OPA2727AIDRBR when two matched amplifiers are needed and board area is limited - saves 33% footprint vs two singles. |
Compared with OPA727AIDRBT and OPA2727AIDRBR, the OPA728AIDRBR uniquely provides logic-controllable shutdown with REF pin, making it the only option among the three for ultra-low-power wake-on-event architectures in optical sensing and portable instrumentation.
Availability
OPA728AIDRBR is available at Aetrix Electronics and suitable for optical networking modules, high-speed data acquisition systems, and industrial process controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA728AIDRBR 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision op amps and signal chain solutions.
The OPA728AIDRBR belongs to TI's e-trim™ precision op amp family, designed specifically for applications demanding ultra-low offset drift, high-speed ac performance, and robust operation in harsh industrial and optical infrastructure environments.
FAQ
What is the maximum operating temperature range for the OPA728AIDRBR?
The OPA728AIDRBR is fully specified and tested from –40°C to +125°C, with absolute maximum junction temperature rated at +150°C. This extended range supports deployment in automotive under-hood modules, industrial motor drives, and outdoor telecom equipment where ambient temperatures exceed standard commercial limits.
How does the REF pin function in the OPA728AIDRBR shutdown circuit?
The REF pin on the OPA728AIDRBR serves as the reference voltage for the Enable input. When REF is tied to V– (as recommended in dual-supply systems), the Enable pin activates at >V– + 2V and deactivates at Yes, the OPA728AIDRBR can drive capacitive loads up to 20pF in unity-gain configuration. For stability with larger loads, TI recommends inserting a 10Ω–20Ω series resistor inside the feedback loop (between output and inverting input), which suppresses ringing while preserving dc accuracy and bandwidth. The exposed thermal die pad on the OPA728AIDRBR's DFN-8 package must be soldered to a PCB copper pour connected to V–. This reduces θJA from 150°C/W (MSOP-8) to 46°C/W, enabling reliable operation at full output swing and +125°C ambient - essential for compact, high-density optical transceiver designs. No, the OPA728AIDRBR is internally compensated for unity-gain stability across its full operating voltage and temperature range. It maintains >60° phase margin with 100pF capacitive load and exhibits no peaking in small-signal step response - verified in Figure 26 of the SBOS314H datasheet.Can the OPA728AIDRBR drive capacitive loads, and what is the recommended compensation?
What is the significance of the DFN-8 package's exposed thermal pad on the OPA728AIDRBR?
Does the OPA728AIDRBR require external compensation for unity-gain stability?
OPA728AIDRBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 85 pA
- Voltage - Input Offset:
- 15 µV
- Current - Supply:
- 4.3mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SON (3x3)
OPA728AIDRBR FAQ
1.How can I place an order for OPA728AIDRBR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA728AIDRBR 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 OPA728AIDRBR reliable?
The price and inventory of OPA728AIDRBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA728AIDRBR is usually 5 days.
3.What payment methods are accepted for OPA728AIDRBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA728AIDRBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA728AIDRBR?
OPA728AIDRBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA728AIDRBR 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 OPA728AIDRBR?
For technical support, including OPA728AIDRBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA728AIDRBR requirements.
6.How does Aetrix verify that OPA728AIDRBR is sourced from the original manufacturer or authorized distributors?
All OPA728AIDRBR 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 OPA728AIDRBR meets industry standards.
7.What is the process for return or replacement of OPA728AIDRBR?
All OPA728AIDRBR units undergo pre-shipment inspection (PSI). If there is an issue with OPA728AIDRBR, 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 OPA728AIDRBR part is unused and in its original packaging.
Return procedure for OPA728AIDRBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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