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Texas Instruments OPA728AIDGKR
- Part No.:
- OPA728AIDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA728AIDGKR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,193
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Product details
Overview
OPA728AIDGKR from Texas Instruments is a single-channel, e-trim™ high-precision CMOS operational amplifier with shutdown functionality in an 8-pin VSSOP package. It delivers 20MHz gain-bandwidth, 30V/µs slew rate, 150µV max input offset voltage, 1.5µV/°C max drift, and 6nV/√Hz noise at 100kHz - optimized for transimpedance amplifiers in optical networking and precision active filters.
For engineers reviewing the OPA728AIDGKR datasheet, OPA728AIDGKR pinout, OPA728AIDGKR application, or OPA728AIDGKR equivalent, key selection criteria include its rail-to-rail output swing (150mV from rails), 4.3mA quiescent current (reduced to 6µA in shutdown), ±2V to ±6V / +4V to +12V supply range, and enable/reference pin architecture for dual-supply logic compatibility.
Technical Context
The OPA728AIDGKR implements e-trim™ technology - digital post-package trimming of offset and temperature drift - enabling 150µV max VOS and 1.5µV/°C max drift without performance shift from molding stress. Its CMOS input stage achieves 500pA max bias current and 1011 Ω||5pF input impedance, supporting high-impedance photodiode interfaces.
It features a Class AB rail-to-rail output stage delivering 40mA output current and stable unity-gain operation. The ENABLE/REF pin architecture allows direct CMOS logic control in both single- and dual-supply configurations, with REF referenced to V– and VL/VH thresholds defined relative to VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 20MHz - supports stable unity-gain buffering of fast 16-bit ADCs like ADS8342 within 600ns acquisition windows. |
| Slew Rate | 30V/µs - enables clean large-signal step response with <450ns 0.01% settling for 5V steps. |
| Input Offset Voltage | 150µV max - ensures sub-LSB error in 16-bit systems with ±2.5V full-scale range. |
| Offset Drift | 1.5µV/°C max - maintains accuracy over –40°C to +125°C industrial temperature range. |
| Quiescent Current | 4.3mA/ch (active), 6µA (shutdown) - enables low-power optical monitoring with rapid wake-up (<80µs tON). |
| Noise Density | 6nV/√Hz at 100kHz - critical for low-noise transimpedance amplification of weak photodiode currents. |
| Supply Range | +4V to +12V or ±2V to ±6V - supports flexible single-supply optical front-ends and dual-supply instrumentation. |
Pinout & Package
The OPA728AIDGKR is housed in an 8-pin VSSOP (DGK) package with exposed thermal pad connected to V–. Pin 1 is Enable, Pin 2 is V+, Pin 3 is OUT, Pin 4 is NC, Pin 5 is REF, Pin 6 is IN–, Pin 7 is IN+, Pin 8 is V–.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Enable) | Shutdown control input | Active-high logic input referenced to REF; enables amplifier when > VREF + 2V, disables when < VREF + 0.8V. |
| 2 (V+) | Positive supply rail | Accepts +4V to +12V or +6V in dual-supply; bypass with 1nF ceramic + 1µF tantalum. |
| 3 (OUT) | Amplifier output | Rail-to-rail capable: swings to within 150mV of V+ or V– under light loads (100kΩ), maintaining AOL > 110dB. |
| 4 (NC) | No internal connection | Not bonded; must be left unconnected or grounded per layout guidelines. |
| 5 (REF) | Enable reference voltage | Reference point for Enable pin; connect to DGND in dual-supply configs to avoid level-shifting logic signals. |
| 6 (IN–) | Inverting input | High-impedance CMOS node; input common-mode range extends from V– to (V+) – 2.5V. |
| 7 (IN+) | Non-inverting input | Same CMRR and PSRR specs as IN–; supports true single-supply operation with GND-referenced inputs. |
| 8 (V–) | Negative supply rail | Connect exposed thermal pad directly to this pin; required for thermal reliability and structural integrity. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ post-package trimming | Digitally corrects offset and drift after molding, eliminating parametric shift and guaranteeing 150µV/1.5µV/°C specs across temperature. |
| Enable/REF architecture | Allows direct interfacing with standard CMOS logic in both single- and dual-supply systems without external level shifters. |
| Rail-to-rail output stage | Class AB design delivers 40mA drive capability while maintaining linearity to within 150mV of either rail at 100kΩ load. |
| Low-input-bias-current CMOS input | 500pA max bias current enables high-gain transimpedance designs with minimal dark-current error in photodiode applications. |
| Stable unity-gain operation | Internally compensated for G ≥ 1; drives capacitive loads up to 20pF with controlled overshoot via optional series resistor. |
Applications
| Optical Power Monitoring | High-Speed 16-Bit ADC Driver |
|---|---|
Use Scenario: Monitoring received optical power in ONET-compliant SFP modules using a PIN photodiode. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to voltage with minimal noise and drift. Use Value: 6nV/√Hz noise at 100kHz and <1.5µV/°C drift ensure stable calibration over temperature; 500pA bias current prevents signal loss in high-RF configurations. | Use Scenario: Buffering and gain-setting for the analog input of TI's ADS8342 16-bit, 250kSPS ADC in test equipment. IC Role / Device Role / Timing Role: Precision driver providing fast settling (<450ns to 0.01%) and charge injection immunity during ADC acquisition. Use Value: 20MHz GBW and 30V/µs slew rate enable full-scale step settling within the 600ns acquisition window; rail-to-rail output maximizes dynamic range. |
| Single-Supply Active Filters | Process Control Signal Conditioning |
Use Scenario: 4-pole Butterworth low-pass filter (50kHz cutoff) in portable medical sensors powered from +5V. IC Role / Device Role / Timing Role: High-linearity op amp in Sallen-Key topology with G = 1 configuration. Use Value: 0.0003% THD+N at 1kHz ensures minimal harmonic distortion; 4.3mA quiescent current supports battery operation. | Use Scenario: Isolated 4–20mA loop receiver with precision I/V conversion and offset correction in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Low-drift, high-CMRR amplifier rejecting common-mode noise on long sensor cables. Use Value: 94dB min CMRR and 150µV max VOS maintain accuracy despite ground potential differences; –40°C to +125°C rating suits harsh environments. |
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 |
|---|---|---|---|
| OPA727AIDGKR | No shutdown function; identical GBW, noise, offset, and drift specs; same VSSOP-8 package and pinout except Enable/REF pins omitted. | Used where continuous operation is required and power cycling is unnecessary. | Select OPA727AIDGKR when shutdown is not needed and board space or BOM simplification is prioritized. |
| OPA2727AIDRBR | Dual-channel version in DFN-8; shares all core specs (20MHz, 150µV VOS, 1.5µV/°C drift) but lacks shutdown; different pinout and thermal pad connection. | Preferred in space-constrained dual-amplifier circuits like differential drivers or dual-filter stages. | Choose OPA2727AIDRBR only when two matched amplifiers are required and shutdown is irrelevant. |
Compared with OPA727AIDGKR, the OPA728AIDGKR adds shutdown control at no cost to precision or speed, while OPA2727AIDRBR offers channel density at the expense of shutdown and package compatibility - making OPA728AIDGKR optimal for power-aware single-channel precision signal chains.
Availability
OPA728AIDGKR is available at Aetrix Electronics and suitable for optical networking, high-speed data acquisition, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA728AIDGKR 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 specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPA728AIDGKR belongs to TI's e-trim™ high-precision op amp product line, engineered for applications demanding ultra-low offset, minimal drift, and low noise - especially in optical sensing, test equipment, and industrial signal conditioning.
FAQ
What is the maximum operating temperature range for the OPA728AIDGKR?
The OPA728AIDGKR is specified for operation from –40°C to +125°C, with absolute maximum junction temperature rated at +150°C. This extended industrial temperature range makes it suitable for deployment in automotive under-hood modules, industrial PLCs, and outdoor optical network terminals where ambient conditions exceed commercial-grade limits. All electrical characteristics in the SBOS314H datasheet are guaranteed across this full range.
How does the ENABLE/REF pin architecture work in dual-supply configurations for the OPA728AIDGKR?
In dual-supply setups, the REF pin of the OPA728AIDGKR should be connected to logic ground (DGND), establishing a stable reference for the ENABLE input. When ENABLE exceeds DGND + 2V, the amplifier activates; below DGND + 0.8V, it enters shutdown (6µA IQ). This eliminates level-shifting circuitry and allows direct interface with standard 3.3V or 5V CMOS logic, as confirmed in Figure 28 of the SBOS314H datasheet.
Can the OPA728AIDGKR drive capacitive loads, and what is the recommended compensation method?
Yes, the OPA728AIDGKR can drive capacitive loads up to 20pF in unity-gain configuration. For improved stability with larger loads, TI recommends inserting a 10Ω–20Ω series resistor inside the feedback loop (between output and inverting input), as shown in Figure 30 of SBOS314H. This reduces ringing without affecting DC accuracy and is validated for loads up to 4pF with minimal overshoot.
What is the purpose of the exposed thermal pad on the OPA728AIDGKR VSSOP package?
The exposed thermal pad on the bottom of the OPA728AIDGKR's VSSOP-8 (DGK) package must be soldered to a PCB copper pour connected to V–. It reduces θJA to 150°C/W, improves thermal reliability during temperature cycling, and enhances mechanical robustness against board-level stresses like key push and package shear - as mandated in TI's SLUA271 application note and SBOS314H layout guidelines.
Is the OPA728AIDGKR pin-compatible with other members of the OPA727/728 family?
No - the OPA728AIDGKR is not pin-compatible with non-shutdown variants like OPA727AIDGKR due to dedicated ENABLE (Pin 1) and REF (Pin 5) pins. While both use VSSOP-8 packages, the pin functions differ: OPA727AIDGKR has NC on Pins 1 and 4, whereas OPA728AIDGKR assigns those pins to control functions. Layout redesign is required when substituting between these variants.
OPA728AIDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-VSSOP
OPA728AIDGKR FAQ
1.How can I place an order for OPA728AIDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA728AIDGKR 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 OPA728AIDGKR reliable?
The price and inventory of OPA728AIDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA728AIDGKR is usually 5 days.
3.What payment methods are accepted for OPA728AIDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA728AIDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA728AIDGKR?
OPA728AIDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA728AIDGKR 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 OPA728AIDGKR?
For technical support, including OPA728AIDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA728AIDGKR requirements.
6.How does Aetrix verify that OPA728AIDGKR is sourced from the original manufacturer or authorized distributors?
All OPA728AIDGKR 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 OPA728AIDGKR meets industry standards.
7.What is the process for return or replacement of OPA728AIDGKR?
All OPA728AIDGKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA728AIDGKR, 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 OPA728AIDGKR part is unused and in its original packaging.
Return procedure for OPA728AIDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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