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Texas Instruments OPA843ID
- Part No.:
- OPA843ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA843ID.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
OPA843ID from Texas Instruments is a wideband, low-distortion, medium-gain voltage-feedback operational amplifier in SO-8 package, featuring 800MHz gain-bandwidth product, –96dBc 3rd-harmonic distortion at 5MHz, and 2.0nV/√Hz input voltage noise. It delivers ±100mA output current and settles to 0.01% in 10.5ns - optimized for high-fidelity ADC/DAC buffering and wideband transimpedance applications up to 5MHz.
For engineers reviewing the OPA843ID datasheet, OPA843ID pinout, OPA843ID application, or OPA843ID equivalent, this page provides verified technical context, SO-8 pin mapping, real-world distortion vs. load data, differential driver configuration guidance, and two validated alternative op amps with documented performance trade-offs.
Technical Context
The OPA843ID uses a two-stage voltage-feedback architecture delivering 800MHz gain-bandwidth while maintaining DC precision: 110dB open-loop gain, ±300µV input offset voltage, and >95dB CMRR at DC. Its classic differential input stage enables simultaneous high-speed operation and low-noise signal conditioning without sacrificing DC accuracy.
It supports both noninverting (G = +3 to +20) and inverting (G = –1 to –40) configurations with stable small-signal bandwidths up to 500MHz (G = +3) and maintains <0.1dB gain flatness to 65MHz at G = +5 into 100Ω. Harmonic distortion is dominated by 2nd-harmonic at low frequencies and 3rd-harmonic above 1MHz, with RL-dependent suppression down to –110dBc at 500Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 800MHz minimum - enables stable G = +5 operation up to 260MHz and G = +10 up to 85MHz with predictable closed-loop response. |
| Input Voltage Noise | 2.0nV/√Hz typical above 1MHz - ensures minimal added noise in 12–16-bit converter interfaces and low-noise receiver front-ends. |
| 3rd-Harmonic Distortion | –96dBc maximum at 5MHz, RL = 500Ω - supports high-SFDR signal chains in IF amplification and professional audio where even-order cancellation is critical. |
| Settling Time (0.01%) | 10.5ns typical for 2V step - meets timing budget for fast 12-bit SAR and pipeline ADC drivers requiring sub-12ns acquisition windows. |
| Output Current Drive | ±100mA minimum - sustains full-scale output into 100Ω loads (±3.0V swing) and enables direct driving of 50Ω transmission lines with external termination. |
| Open-Loop Gain | 110dB minimum - provides high loop gain for precise gain accuracy (<0.2dB error with 1% resistors) and robust common-mode rejection in single-ended and differential configurations. |
| Supply Voltage Range | ±4V to ±6V - operates from standard ±5V rails with 20.2mA typical quiescent current, enabling compatibility with legacy analog signal chains. |
Pinout & Package
OPA843ID is housed in an SO-8 (D) package with exposed pad not electrically connected. Pin 1 is marked with a dot; pins are numbered counter-clockwise. The device features two no-connect (NC) pins to isolate input and power domains and minimize crosstalk in high-frequency layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection (NC) | Electrically isolated; used for mechanical symmetry and thermal relief - must remain unconnected per TI design guidelines. |
| 2 | Inverting Input (–IN) | Differential input node; requires matched trace length and impedance control when used in inverting or differential configurations. |
| 3 | Noninverting Input (+IN) | Differential input node; referenced to ground or common-mode bias in single-ended applications; sensitive to PCB parasitics above 10MHz. |
| 4 | –VS | Negative supply rail; must be decoupled with 0.1µF ceramic + 2.2µF tantalum close to pin to suppress high-frequency PSRR degradation. |
| 5 | Output (OUT) | Class-AB output stage; capable of ±100mA drive; requires series resistor (e.g., 402Ω) for 50Ω source/load matching in RF test setups. |
| 6 | +VS | Positive supply rail; identical decoupling requirements as –VS; shared return path with –VS must avoid ground bounce in high-slew-rate switching. |
| 7 | No Connection (NC) | Electrically isolated; serves as thermal pad anchor point but carries no signal or power - must not be tied to ground or supply. |
| 8 | No Connection (NC) | Unused terminal; maintains package symmetry and aids automated optical inspection - no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| High dynamic range at medium gain | Combines 260MHz bandwidth at G = +5 with –96dBc 3rd-harmonic distortion - enables clean signal amplification across 12–16-bit converter interfaces without post-processing correction. |
| DC precision in high-speed op amp | ±300µV max input offset voltage and 110dB open-loop gain - preserves absolute accuracy in active filters and precision IF gain stages where gain error must stay below 0.05%. |
| Low-noise transimpedance capability | 2.0nV/√Hz input voltage noise + 2.8pA/√Hz input current noise - supports photodiode amplifiers with >24MHz bandwidth and <1pF feedback capacitance requirements. |
| Fast settling with low overshoot | 10.5ns to 0.01% on 2V step and <1.2ns rise time - eliminates acquisition delay in multiplexed data acquisition systems and high-speed test instrumentation. |
| Differential driver optimization | Validated dual-OPA843 configuration achieves <–100dBc 3rd-harmonic at 4VPP into 400Ω - delivers professional audio line drivers and broadband communications signals with minimal even-order artifacts. |
Applications
| ADC/DAC Buffer Amplifier | Low-Distortion IF Amplifier |
|---|---|
Use Scenario: Driving the analog input of a 14-bit, 5MSPS pipeline ADC in medical imaging front-end with 0–5MHz signal bandwidth. IC Role / Device Role / Timing Role: Single-ended buffer providing gain-of-1 signal conditioning, DC-coupled offset alignment, and 0.01%-settled sampling aperture. Use Value: 93dB SFDR at 5MHz eliminates need for digital post-correction; ±300µV offset enables <0.01% full-scale gain calibration without trimming. |
Use Scenario: Intermediate frequency stage in a 44MHz narrowband radio receiver requiring >33dBm 3rd-order intercept and <0.01° differential phase error. IC Role / Device Role / Timing Role: Fixed-gain (G = +4) noninverting amplifier operating from ±5V rails with 12dB gain flatness over 40–50MHz band. Use Value: 33dBm intercept at 44MHz exceeds discrete transistor IF amps at same power; 0.012° differential phase preserves NTSC video fidelity. |
| Wideband Transimpedance Amplifier | Professional Audio Line Driver |
Use Scenario: Photodiode current-to-voltage conversion in laser rangefinder with 20pF diode capacitance and 10kΩ target transimpedance. IC Role / Device Role / Timing Role: Transimpedance amplifier using 0.75pF CF compensation to achieve 24MHz –3dB bandwidth and maximally flat Butterworth response. Use Value: 2.0nV/√Hz noise + 800MHz GBP enables 24MHz bandwidth with <0.5% peaking - meets time-of-flight resolution <1ns. |
Use Scenario: Balanced line driver in broadcast audio console output stage delivering ±10VPP into 600Ω loads with <–100dB THD+N. IC Role / Device Role / Timing Role: Dual OPA843-based differential driver generating complementary outputs with matched slew rate and propagation delay. Use Value: –110dBc 3rd-harmonic at 20kHz and <0.001% differential gain error preserve stereo imaging and transient clarity in mastering applications. |
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 voltage noise (2.6nV/√Hz), same SO-8 package and pinout. | Reduced bandwidth limits use in >3MHz ADC buffers; acceptable for cost-sensitive IF amplifiers where –90dBc distortion suffices. | Select OPA842ID only when 260MHz bandwidth and –96dBc distortion are not required - saves ~15% BOM cost with identical layout. |
| OPA846IDBVR | Higher GBW (1750MHz), lower noise (1.2nV/√Hz), SOT-23-5 package (5-pin, no NC pins), different pinout. | Not pin-compatible; requires PCB redesign; superior for >100MHz transimpedance or RF sampling clock distribution. | Choose OPA846IDBVR only for new designs targeting >500MHz small-signal bandwidth - not a drop-in replacement for OPA843ID. |
Compared with OPA843ID, OPA842ID trades 30% bandwidth and 0.6nV/√Hz noise for lower cost and identical footprint, while OPA846IDBVR offers 2.2× bandwidth in a smaller 5-pin package but mandates layout revision and lacks NC pins for isolation-critical analog routing.
Availability
OPA843ID is available at Aetrix Electronics and suitable for ADC/DAC interface design, professional audio equipment, test instrumentation, and wideband transimpedance amplifier development requiring stable component supply and long-term production continuity.
Supply support for OPA843ID 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 OPA843ID belongs to TI's OPAx84x family of wideband voltage-feedback op amps engineered for applications demanding simultaneous high speed, low distortion, and DC precision - particularly in data converter interfaces and communications infrastructure.
FAQ
What is the maximum recommended supply voltage for OPA843ID?
The absolute maximum supply voltage for OPA843ID is ±6.5VDC, but the specified operating range is ±4V to ±6V. For reliable long-term operation with full parameter guarantees, TI specifies ±5V as the typical supply - exceeding ±6V risks permanent damage to the internal ESD protection structures and may degrade harmonic distortion performance beyond datasheet limits.
Does OPA843ID support unity-gain stable operation?
OPA843ID is not unity-gain stable - it is optimized for medium-gain configurations (G ≥ +3). At G = +1, the phase margin drops below 30°, causing peaking and potential oscillation. TI explicitly recommends minimum noninverting gain of +3; for lower gains, external compensation (e.g., capacitor across feedback resistor) or inverting configurations with noise gain ≥ +3 are required to ensure stability.
Can OPA843ID drive a 50Ω load directly?
Yes, OPA843ID can drive a 50Ω load directly: its ±100mA output current rating supports ±3.0V swing into 100Ω and ±2.6V into 50Ω per datasheet specifications. However, for optimal 50Ω source termination in RF test setups, TI recommends adding a 402Ω series resistor at the output to match the 50Ω measurement load - preserving bandwidth and minimizing reflections without exceeding current limits.
What is the thermal resistance (θJA) of OPA843ID in SO-8 package?
The junction-to-ambient thermal resistance (θJA) for OPA843ID in SO-8 (D) package is 125°C/W under standard JEDEC 2-layer board conditions. This value assumes proper PCB copper pour under the exposed pad area; omitting thermal vias or reducing copper area increases θJA significantly - TI recommends ≥4 thermal vias (0.3mm diameter) under the pad to maintain safe junction temperature below 150°C at 20.2mA quiescent current.
How does OPA843ID compare to OPA643 in terms of upgrade path?
OPA843ID is positioned as a direct upgrade to OPA643, offering 2.5× higher gain-bandwidth (800MHz vs. 320MHz), 30% lower input voltage noise (2.0nV/√Hz vs. 2.9nV/√Hz), and 12dB better 3rd-harmonic distortion at 5MHz (–96dBc vs. –84dBc). Unlike OPA643, OPA843ID maintains DC precision (±300µV offset) while achieving these RF-grade specs - making it suitable for next-generation 14-bit+ data acquisition without changing PCB layout.
OPA843ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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
OPA843ID FAQ
1.How can I place an order for OPA843ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA843ID 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 OPA843ID reliable?
The price and inventory of OPA843ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA843ID is usually 5 days.
3.What payment methods are accepted for OPA843ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA843ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA843ID?
OPA843ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA843ID 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 OPA843ID?
For technical support, including OPA843ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA843ID requirements.
6.How does Aetrix verify that OPA843ID is sourced from the original manufacturer or authorized distributors?
All OPA843ID 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 OPA843ID meets industry standards.
7.What is the process for return or replacement of OPA843ID?
All OPA843ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA843ID, 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 OPA843ID part is unused and in its original packaging.
Return procedure for OPA843ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA843ID Tags
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