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Texas Instruments OPA843IDG4
- Part No.:
- OPA843IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA843IDG4.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,774
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Product details
Overview
OPA843IDG4 from Texas Instruments is a wideband, low-distortion, medium-gain voltage-feedback operational amplifier optimized for high dynamic range signal conditioning. It delivers 260MHz small-signal bandwidth at G = +5, 800MHz gain-bandwidth product, 2.0nV/√Hz input voltage noise, –96dBc 3rd-harmonic distortion at 5MHz, and 110dB open-loop gain - enabling precision ADC/DAC buffering and wideband transimpedance amplification in test instrumentation and professional audio systems.
For engineers reviewing the OPA843IDG4 datasheet, OPA843IDG4 pinout, OPA843IDG4 application, or OPA843IDG4 equivalent, key selection criteria include its ±100mA output drive capability, fast 10.5ns 0.01% settling time, low 300µV input offset voltage, and SO-8 package compatibility with high-speed layout requirements for RF and IF signal chains.
Technical Context
The OPA843IDG4 employs a two-stage voltage-feedback architecture delivering exceptional DC precision (high CMRR, PSRR, and open-loop gain) alongside wideband AC performance. Its classic differential input stage enables simultaneous high-speed operation and low-input-offset behavior - unlike typical high-speed op amps that sacrifice DC accuracy for bandwidth.
It supports both noninverting (G ≥ +3) and inverting (|G| ≥ 1) configurations with stable operation up to 260MHz at G = +5 or G = –8, and features internal compensation optimized for 100Ω–500Ω loads. The device maintains < 0.1dB gain flatness to 65MHz at G = +5 with RL = 100Ω, supporting wideband IF and video applications requiring amplitude fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 800MHz - sets maximum usable closed-loop bandwidth for given gain (e.g., ~160MHz at G = +5 with margin) |
| Small-Signal Bandwidth (G = +5) | 260MHz min - supports full-power analog signal processing up to UHF frequencies |
| Input Voltage Noise | 2.0nV/√Hz - enables low-noise amplification of weak signals without degrading SNR in ADC drivers |
| Harmonic Distortion (5MHz) | –96dBc (3rd-harmonic, RL = 500Ω) - ensures >80dB SFDR in differential IF amplifier configurations |
| Settling Time (0.01%) | 10.5ns typ - meets timing budget for 12-bit data acquisition at multi-MSPS rates |
| Output Current Drive | ±100mA min - drives 100Ω loads directly without external buffers in active filter and summing circuits |
| Open-Loop Gain | 110dB min - provides high loop gain for precise gain accuracy and low gain error in closed-loop designs |
Pinout & Package
OPA843IDG4 is packaged in an SO-8 (D) surface-mount package with exposed pad for thermal enhancement, rated for –40°C to +85°C operation. Pin 1 is marked with a dot or beveled edge; pin numbering follows standard SOIC convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Internally unused; must be left floating or tied to ground per layout best practices |
| 2 | Inverting Input (–) | Differential input node; requires matched trace length and impedance control in high-frequency inverting configurations |
| 3 | Noninverting Input (+) | Differential input node; referenced to system ground or common-mode bias in single-supply applications |
| 4 | –VS | Negative supply rail; requires local 0.1µF ceramic decoupling adjacent to pin |
| 5 | Output | Class-AB output stage; capable of ±100mA sourcing/sinking into 100Ω loads |
| 6 | +VS | Positive supply rail; requires local 0.1µF ceramic decoupling adjacent to pin |
| 7 | No Connection | Internally unused; must be left floating or tied to ground |
| 8 | No Connection | Internally unused; must be left floating or tied to ground |
Key Features
| Feature | Design Value |
|---|---|
| High DC Precision + Wideband AC Performance | Combines 300µV max input offset, 95dB min CMRR, and 260MHz bandwidth - eliminates need for post-amplifier trimming in high-fidelity signal paths |
| Low 3rd-Harmonic Distortion | –96dBc at 5MHz with 500Ω load - enables >80dB SFDR in differential IF stages without harmonic cancellation circuitry |
| Fast Settling with High Accuracy | 10.5ns to 0.01% for 2V step - supports accurate sampling in 12-bit+ ADC interfaces up to 50MSPS effective rate |
| Robust Output Drive | ±100mA continuous output current - drives 100Ω cables, active filters, and parallel termination networks without external buffers |
| Stable Operation with Standard Resistors | Optimized for 200Ω–1kΩ feedback networks - simplifies layout and reduces parasitic sensitivity in RF and video PCBs |
Applications
| ADC/DAC Buffer Amplifier | Low-Distortion "IF" Amplifier |
|---|---|
Use Scenario: Driving the analog input of a 14-bit, 50MSPS ADC in a communications receiver front-end. IC Role / Device Role / Timing Role: High-fidelity buffer isolating ADC from source impedance variations while preserving SNR and SFDR. Use Value: Delivers >93dB SFDR at 5MHz with 8VPP output using differential configuration - exceeds 14-bit ENOB requirements without calibration. | Use Scenario: Amplifying intermediate frequency signals in a 44MHz narrowband radio receiver. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier providing high reverse isolation and low intermodulation distortion. Use Value: Achieves 33dBm 3rd-order intercept at 44MHz while dissipating only 200mW - outperforms fixed-gain IF amps on power efficiency and gain accuracy. |
| Wideband Transimpedance Amplifier | Professional Audio Line Driver |
Use Scenario: Converting photodiode current to voltage in a 24MHz optical time-of-flight sensor. IC Role / Device Role / Timing Role: Transimpedance amplifier with compensated feedback network for stable wideband response. Use Value: Supports 10kΩ transimpedance gain with 0.75pF CF compensation - achieves 24MHz –3dB bandwidth and Butterworth flatness. | Use Scenario: Driving balanced XLR outputs in a digital mixing console with >20VPP swing capability. IC Role / Device Role / Timing Role: Low-distortion line driver delivering high slew rate and low THD+N across 20Hz–20kHz. Use Value: Maintains <0.002% THD+N at 10VPP into 600Ω load - meets AES17 professional audio standards without output transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband, low-distortion operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA842ID | Lower GBW (200MHz), higher input noise (2.6nV/√Hz), same SO-8 package | Suitable for ≤100MHz IF amplifiers where 3dB bandwidth margin is acceptable | Select when lower power (18mA vs 20.2mA) and relaxed distortion (–92dBc) are acceptable trade-offs |
| LMH6629MA | Higher slew rate (1800V/µs), similar noise (2.1nV/√Hz), but lower open-loop gain (90dB) and no SO-8 option | Better for pulse amplification requiring sub-5ns rise time, less suitable for precision DC-coupled gain stages | Choose for transient-critical applications where DC precision is secondary to speed |
Compared with OPA843IDG4, OPA842ID offers reduced bandwidth and higher noise but lower quiescent current, while LMH6629MA delivers faster edges but sacrifices open-loop gain and DC accuracy - making OPA843IDG4 optimal for applications demanding simultaneous high-speed, low-distortion, and high-precision DC performance.
Availability
OPA843IDG4 is available at Aetrix Electronics and suitable for ADC/DAC interface design, IF signal chain development, wideband transimpedance amplification, and professional audio equipment requiring stable component supply and long-term manufacturability.
Supply support for OPA843IDG4 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 high-performance op amp design and manufacturing.
The OPA843IDG4 belongs to TI's OPAx84x family of wideband voltage-feedback op amps, engineered specifically for high-dynamic-range signal conditioning in communications, test & measurement, and professional audio systems.
FAQ
What is the operating temperature range for the OPA843IDG4?
The OPA843IDG4 is specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in base station radios, automated test equipment, and broadcast audio gear where environmental stability is critical. Thermal resistance θJA is 125°C/W in the SO-8 package, requiring appropriate PCB copper area for power dissipation at full ±100mA output.
Does the OPA843IDG4 require external compensation capacitors?
The OPA843IDG4 is internally compensated and does not require external compensation capacitors for unity-gain-stable operation. However, for transimpedance or high-gain (>+20) configurations, external feedback capacitance (e.g., 0.75pF for 10kΩ RF) may be needed to ensure phase margin and prevent peaking. TI's SBOS268C datasheet provides detailed compensation guidelines for specific load conditions.
Can the OPA843IDG4 drive a 50Ω coaxial cable directly?
Yes, the OPA843IDG4 can drive a 50Ω load directly with ±100mA output current capability, supporting up to ±3.0V swing into 50Ω at ±5V supplies. For optimal harmonic distortion performance, TI recommends using a series 50Ω resistor at the output (as shown in Figure 1 of SBOS268C) to match the cable impedance and minimize reflections - achieving –96dBc 3rd-harmonic at 5MHz.
How does the OPA843IDG4 compare to the OPA643 in terms of upgrade path?
The OPA843IDG4 is explicitly positioned as an OPA643 upgrade, offering 260MHz bandwidth (vs 200MHz), 800MHz GBW (vs 600MHz), –96dBc distortion (vs –90dBc), and 110dB open-loop gain (vs 95dB). These improvements enable higher-resolution ADC interfacing and wider IF bandwidths without changing PCB layout - making it a drop-in performance upgrade for existing OPA643 designs using SO-8 footprints.
Is the OPA843IDG4 suitable for single-supply operation?
The OPA843IDG4 supports single-supply operation with rail-to-rail output swing limitations: minimum output swing is 3.0V above negative rail and –3.5V below positive rail into 100Ω. For true rail-to-rail input/output, external level-shifting or biasing is required. Its input common-mode range extends to ±3.2V with ±5V supplies, allowing use in 3.3V or 5V single-supply systems with proper VCM biasing at the noninverting input.
OPA843IDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1000V/µs
- Gain Bandwidth Product:
- 800 MHz
- -3db Bandwidth:
- 500 MHz
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 20.2mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA843IDG4 FAQ
1.How can I place an order for OPA843IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA843IDG4 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 OPA843IDG4 reliable?
The price and inventory of OPA843IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA843IDG4 is usually 5 days.
3.What payment methods are accepted for OPA843IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA843IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA843IDG4?
OPA843IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA843IDG4 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 OPA843IDG4?
For technical support, including OPA843IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA843IDG4 requirements.
6.How does Aetrix verify that OPA843IDG4 is sourced from the original manufacturer or authorized distributors?
All OPA843IDG4 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 OPA843IDG4 meets industry standards.
7.What is the process for return or replacement of OPA843IDG4?
All OPA843IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA843IDG4, 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 OPA843IDG4 part is unused and in its original packaging.
Return procedure for OPA843IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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