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Texas Instruments OPA728AIDRBRG4
- Part No.:
- OPA728AIDRBRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
OPA728AIDRBRG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,145
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Product details
Overview
OPA728AIDRBRG4 from Texas Instruments is a single-channel, high-precision CMOS operational amplifier with shutdown functionality, featuring 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 is optimized for transimpedance amplifiers in optical networking and precision ADC driver applications.
For engineers reviewing the OPA728AIDRBRG4 datasheet, OPA728AIDRBRG4 pinout, OPA728AIDRBRG4 application, or OPA728AIDRBRG4 equivalent, key selection criteria include its e-trim™-enabled 1.5µV/°C max offset drift, 6µA shutdown quiescent current, REF pin for logic-compatible enable control, and DFN-8 package thermal performance (θJA = 46°C/W).
Technical Context
The OPA728AIDRBRG4 implements e-trim™ technology - digital post-package trimming over temperature - to achieve 150µV max offset and 1.5µV/°C max drift without parametric shift from molding stress. Its AB output stage enables rail-to-rail swing into 100kΩ loads while maintaining >110dB open-loop gain.
Shutdown is controlled via an ENABLE pin referenced to a dedicated REF terminal, supporting dual-supply logic interfacing (e.g., VREF = DGND) or single-supply operation. Input common-mode range extends from V– to (V+) – 2.5V, and ESD protection diodes clamp inputs to rails with ±10mA absolute max current rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 20MHz - supports stable unity-gain operation and wideband signal conditioning up to ~10MHz closed-loop bandwidth. |
| Input Offset Voltage (max) | 150µV - enables sub-16-bit error budget in precision sensor interfaces and DAC output buffers. |
| Offset Drift (max) | 1.5µV/°C - ensures <1.2mV total drift over –40°C to +125°C, critical for industrial temperature monitoring. |
| Slew Rate | 30V/µs - drives fast 16-bit ADCs (e.g., ADS8342) with full-scale settling in ≤450ns at 0.01%. |
| Quiescent Current (active) | 4.3mA - balances low power with high-speed performance for battery-powered instrumentation. |
| Shutdown Current | 6µA - reduces system standby power by >99.8%, enabling long-duration sleep modes in portable test gear. |
| Supply Voltage Range | 4V to 12V - compatible with single-supply 5V/12V systems and split ±2V to ±6V rails. |
| Output Swing (vs rail) | 150mV - delivers >97% dynamic range at 100kΩ load, maximizing SNR in high-resolution data acquisition. |
Pinout & Package
OPA728AIDRBRG4 is housed in an 8-pin DFN (DRB) package with exposed thermal die pad soldered to V–. The package measures 3.0mm × 3.0mm × 0.8mm and features 0.5mm pitch, optimized for thermal dissipation (θJA = 46°C/W) and minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ENABLE) | Shutdown control input | Active-high logic input referenced to REF pin; enables amplifier when > VREF + 2V. |
| 2 (V+) | Positive supply | Accepts 4V to 12V single supply or +2V to +6V in dual-supply configuration. |
| 3 (OUT) | Analog output | Rail-to-rail capable; swings within 150mV of V+ or V– under light load (100kΩ). |
| 4 (NC) | No internal connection | Unbonded pad; must be left floating or grounded per layout guidelines. |
| 5 (NC) | No internal connection | Unbonded pad; no electrical function. |
| 6 (–IN) | Inverting input | High-impedance CMOS node (1011Ω); accepts common-mode voltage from V– to (V+) – 2.5V. |
| 7 (+IN) | Non-inverting input | High-impedance CMOS node; matched bias current (<500pA) minimizes I/V conversion errors. |
| 8 (V–) | Negative supply / ground | Reference for REF pin and thermal die pad; must be connected to PCB ground plane. |
| Exposed Pad | Thermal & electrical ground | Internally tied to V–; soldering to PCB heatsink improves thermal reliability and reduces θJA. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ post-package trimming | Digitally corrects offset and drift after molding, eliminating stress-induced parameter shifts and guaranteeing 150µV/1.5µV/°C specs across –40°C to +125°C. |
| REF pin for shutdown reference | Allows direct interface with standard CMOS logic in dual-supply systems (e.g., REF = DGND), eliminating level-shifting circuitry. |
| Rail-to-rail output stage | AB-class output delivers 150mV rail margin at 100kΩ load while sustaining >110dB open-loop gain for precision linearity. |
| Low input bias current | ≤500pA max enables accurate transimpedance amplification of photodiode currents without significant DC error. |
| Optimized capacitive load drive | Stable with ≥20pF load in G = +1; optional 10Ω series resistor in feedback path suppresses ringing in ADC driver configurations. |
| Wide supply range & temp grade | Specified from 4V to 12V and –40°C to +125°C, supporting industrial, automotive, and optical networking environments. |
Applications
| Optical Power Monitoring | High-Speed Precision ADC Driver |
|---|---|
Use Scenario: Converting photocurrent from PIN photodiodes in ONET-compliant optical receivers. IC Role / Device Role / Timing Role: Transimpedance amplifier (I/V converter) with 10MΩ–100MΩ gain, compensating photodiode capacitance up to 10pF. Use Value: 6nV/√Hz input voltage noise at 100kHz and <500pA bias current minimize Johnson and shot noise, enabling –40dBm sensitivity. | Use Scenario: Buffering and gain-setting for 16-bit SAR ADCs like ADS8342 in automated test equipment. IC Role / Device Role / Timing Role: Single-ended driver with 600ns acquisition window compliance and charge injection rejection. Use Value: 450ns 0.01% settling time and 30V/µs slew rate ensure full-scale accuracy within ADC aperture time. |
| Single-Supply Signal Conditioning | Process Control Loop Amplifier |
Use Scenario: Amplifying low-level sensor outputs (e.g., RTD, strain gauge) in 5V microcontroller-based systems. IC Role / Device Role / Timing Role: Precision non-inverting amplifier with GND-referenced input and rail-swinging output. Use Value: Input common-mode range to V– and 150mV rail swing maximize dynamic range without dual supplies. | Use Scenario: Isolating and scaling 4–20mA loop signals in PLC analog input modules. IC Role / Device Role / Timing Role: Low-drift, low-noise buffer for current-to-voltage conversion and filtering. Use Value: 1.5µV/°C max drift and 86dB min CMRR maintain <0.1% FSR error across industrial temperature ranges. |
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 |
|---|---|---|---|
| OPA728AIDGKTG4 | VSSOP-8 package (3.0mm × 3.0mm vs DFN-8's 3.0mm × 3.0mm), same electrical specs, θJA = 150°C/W vs 46°C/W. | Lower thermal performance limits continuous 4.3mA operation in compact enclosures; suitable for space-constrained but thermally benign layouts. | Select OPA728AIDGKTG4 only when board real estate prohibits DFN placement or reflow profile excludes exposed-pad soldering. |
| OPA2727AIDRBRG4 | Dual-channel version in identical DFN-8 package; shares 20MHz GBW, 150µV offset, and e-trim™, but lacks shutdown and REF pin. | No enable control; unsuitable for power-gated subsystems; channel separation >100dB allows independent signal paths in multi-channel DAQ. | Choose OPA2727AIDRBRG4 when two matched amplifiers are needed without shutdown, reducing component count in dual-sensor interfaces. |
Compared with OPA728AIDGKTG4, the OPA728AIDRBRG4 offers superior thermal management for sustained high-speed operation; versus OPA2727AIDRBRG4, it provides essential power-control capability for battery-sensitive designs while retaining identical precision and bandwidth.
Availability
OPA728AIDRBRG4 is available at Aetrix Electronics and suitable for optical networking transceivers, high-speed data acquisition systems, and industrial process controllers requiring stable component supply across extended temperature ranges.
Supply support for OPA728AIDRBRG4 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 innovation in precision amplifiers and signal chain solutions.
The OPA728AIDRBRG4 belongs to TI's e-trim™ high-precision op amp family, designed specifically for applications demanding ultra-low offset drift, wide bandwidth, and robust single-supply operation in harsh environments.
FAQ
What is the maximum operating temperature range for the OPA728AIDRBRG4?
The OPA728AIDRBRG4 is fully specified from –40°C to +125°C, with absolute maximum junction temperature rated at +150°C. Its e-trim™ calibration is performed across this full range, ensuring 150µV max offset and 1.5µV/°C max drift remain valid throughout industrial and automotive under-hood applications. Thermal derating is not required below +125°C ambient when using the DFN-8 package's 46°C/W θJA.
How does the REF pin function in the OPA728AIDRBRG4 shutdown circuit?
The REF pin on the OPA728AIDRBRG4 serves as the reference voltage for the ENABLE input, allowing flexible logic interfacing. When REF is tied to DGND in dual-supply systems, ENABLE activates with standard 0V/5V CMOS levels; in single-supply setups, REF may be set to V–. The amplifier enables when ENABLE > REF + 2V and shuts down when ENABLE < REF + 0.8V. This architecture eliminates external level shifters and supports direct microcontroller GPIO control.
Can the OPA728AIDRBRG4 drive capacitive loads typical of ADC input circuits?
Yes, the OPA728AIDRBRG4 is characterized for stability with ≥20pF capacitive loads in unity-gain configuration. For ADC drivers like the ADS8342, TI recommends adding a 10Ω–20Ω series resistor inside the feedback loop to dampen ringing while preserving DC accuracy. This technique, validated in Figure 30 of the SBOS314H datasheet, ensures clean step response and 0.01% settling within 450ns even with 20pF+ stray capacitance at the input node.
What is the significance of the DFN-8 package's exposed thermal pad for the OPA728AIDRBRG4?
The exposed thermal pad on the OPA728AIDRBRG4's DFN-8 package must be soldered to a PCB copper pour connected to V–. This connection reduces θJA from 150°C/W (VSSOP) to 46°C/W, enabling reliable 4.3mA operation at +125°C ambient. It also enhances mechanical reliability during thermal cycling and prevents delamination. TI's SLUA271 application note specifies minimum 5 thermal vias (0.3mm diameter) under the pad for optimal heat transfer.
How does the OPA728AIDRBRG4's input bias current affect transimpedance amplifier design?
The OPA728AIDRBRG4's ≤500pA max input bias current directly limits achievable transimpedance gain and dark-current error in photodiode circuits. At 100MΩ RF, 500pA bias introduces 50mV offset - unacceptable for low-light detection. Designers must use guard rings, low-leakage PCB materials, and reverse-biased photodiodes to keep total error <1mV. The 500pA spec is guaranteed over –40°C to +125°C, making it suitable for uncooled optical modules.
OPA728AIDRBRG4 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)
OPA728AIDRBRG4 FAQ
1.How can I place an order for OPA728AIDRBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA728AIDRBRG4 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 OPA728AIDRBRG4 reliable?
The price and inventory of OPA728AIDRBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA728AIDRBRG4 is usually 5 days.
3.What payment methods are accepted for OPA728AIDRBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA728AIDRBRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA728AIDRBRG4?
OPA728AIDRBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA728AIDRBRG4 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 OPA728AIDRBRG4?
For technical support, including OPA728AIDRBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA728AIDRBRG4 requirements.
6.How does Aetrix verify that OPA728AIDRBRG4 is sourced from the original manufacturer or authorized distributors?
All OPA728AIDRBRG4 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 OPA728AIDRBRG4 meets industry standards.
7.What is the process for return or replacement of OPA728AIDRBRG4?
All OPA728AIDRBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA728AIDRBRG4, 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 OPA728AIDRBRG4 part is unused and in its original packaging.
Return procedure for OPA728AIDRBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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