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Texas Instruments OPA843IDR
- Part No.:
- OPA843IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA843IDR.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,129
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Product details
Overview
OPA843IDR 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, –96dBc 3rd-harmonic distortion at 5MHz, and 2.0nV/√Hz input voltage noise - enabling precision ADC/DAC buffering and wideband transimpedance amplification in test instrumentation and professional audio systems.
For engineers reviewing the OPA843IDR datasheet, OPA843IDR pinout, OPA843IDR application, or OPA843IDR equivalent, key selection considerations include its SO-8 package thermal resistance (θJA = 125°C/W), ±100mA output drive capability, fast 10.5ns 0.01% settling time, and verified performance in differential driver configurations up to 8VP-P with <–100dBc 3rd-harmonic distortion.
Technical Context
The OPA843IDR employs a two-stage voltage-feedback architecture with classic differential input, delivering high open-loop gain (110dB) and exceptional DC precision alongside RF-grade AC performance. Its design balances high slew rate (1000V/µs min), low input offset voltage (±0.3mV max), and robust power-supply rejection (100dB min) to support demanding mixed-signal interfaces.
This amplifier operates over ±4V to ±6V supplies with specified performance from –40°C to +85°C. Its SO-8 package supports stable operation into capacitive loads up to 100pF when compensated with series output resistance (RS), and it maintains >65MHz 0.1dB gain flatness at G = +5 into 100Ω loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 800MHz - enables stable closed-loop gain ≥+5 with >260MHz bandwidth and predictable phase margin. |
| Small-Signal Bandwidth (G = +5) | 260MHz min - supports high-fidelity signal amplification up to UHF frequencies in IF stages and receiver chains. |
| Input Voltage Noise | 2.0nV/√Hz max above 1MHz - critical for preserving SNR in low-level sensor and photodiode transimpedance applications. |
| Harmonic Distortion (5MHz) | –96dBc 3rd-harmonic max into 500Ω - ensures >80dB SFDR in differential configurations for 12–16-bit converter interfaces. |
| Settling Time (0.01%) | 10.5ns typ for 2V step - meets timing requirements for fast-settling ADC drivers and pulse-amplification circuits. |
| Output Current Drive | ±100mA min - sustains full-scale output swing into 100Ω loads without clipping in active filter and line-driver designs. |
| Open-Loop Gain | 110dB min - provides high loop gain for accurate gain setting and low gain error in precision buffer applications. |
Pinout & Package
OPA843IDR is housed in an SO-8 (D) surface-mount package with exposed pad thermal enhancement. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Internally unconnected - must remain floating or tied to ground only if required by PCB layout EMI mitigation. |
| 2 | Inverting Input | Differential input node; requires matched trace length and impedance control for optimal CMRR and distortion performance. |
| 3 | Noninverting Input | Differential input node; referenced to system ground or common-mode bias in single-supply configurations. |
| 4 | –VS | Negative supply rail; decoupled with 0.1µF ceramic capacitor placed within 2mm of pin for low-impedance AC return path. |
| 5 | Output | Class-AB output stage; capable of ±100mA sourcing/sinking and driving 100Ω loads with <0.01% settling error. |
| 6 | +VS | Positive supply rail; decoupled identically to –VS; supports ±4V to ±6V operation with 20.2mA typical quiescent current. |
| 7 | No Connection | Internally unconnected - no external connection permitted per TI specification. |
| 8 | No Connection | Internally unconnected - not used for thermal pad attachment; thermal pad is separate and must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| High-Speed Precision Architecture | Combines 260MHz bandwidth with ±0.3mV input offset and 110dB open-loop gain - enabling DC-coupled wideband amplification without trimming. |
| Ultra-Low Distortion Output Stage | Delivers –96dBc 3rd-harmonic at 5MHz into 500Ω - supports high-SFDR differential drivers for 14-bit ADCs up to 8VP-P. |
| Optimized Transimpedance Performance | 2.0nV/√Hz input voltage noise + 2.8pA/√Hz current noise - minimizes total input-referred noise in photodiode and current-sensing applications. |
| Fast Settling & High Slew Rate | 10.5ns 0.01% settling time and 1000V/µs slew rate - ensures fidelity in pulse amplification and fast data acquisition front-ends. |
| Robust Power Supply Rejection | 100dB PSRR (±PSRR) from 4.5V to 5.5V - maintains signal integrity in noisy mixed-signal environments with shared analog/digital rails. |
Applications
| ADC/DAC Buffer Amplifier | Low-Distortion "IF" Amplifier |
|---|---|
Use Scenario: Driving the input of a 14-bit, 5MSPS SAR ADC in a test instrumentation channel with ±2V full-scale range. IC Role / Device Role / Timing Role: Precision unity-gain or G = +2 buffer providing low THD, fast settling, and high CMRR to preserve ENOB across temperature. Use Value: Enables >78dB SNR and >80dB SFDR at 5MHz input frequency by suppressing amplifier-induced harmonic distortion and noise coupling. |
Use Scenario: Intermediate-frequency amplification in a 44MHz narrowband communications receiver with 33dBm 3rd-order intercept requirement. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier operating at G = +4 with matched 50Ω I/O, delivering >30dBm intercept up to 50MHz. Use Value: Achieves 33dBm 3rd-order intercept at 44MHz while dissipating only 200mW - outperforming fixed-gain IF amps on intercept-per-watt basis. |
| Wideband Transimpedance Amplifier | Professional Audio Line Driver |
Use Scenario: Converting photocurrent from a 20pF silicon photodiode into voltage with 10kΩ transimpedance gain and 24MHz –3dB bandwidth. IC Role / Device Role / Timing Role: Transimpedance amplifier using OPA843IDR's low input capacitance (2.2pF) and 800MHz GBP to stabilize feedback network with 0.75pF CF. Use Value: Delivers flat frequency response and <–100dBc 3rd-harmonic distortion up to 10MHz - critical for optical time-domain reflectometry and laser pulse detection. |
Use Scenario: Balanced line driver in a digital mixing console output stage requiring 20VP-P swing into 600Ω load with <0.002% THD+N. IC Role / Device Role / Timing Role: Dual OPA843IDR configured as fully differential driver with external 400Ω load termination and 100Ω output series resistors. Use Value: Supports >100dB dynamic range and <–110dBc 2nd/3rd harmonics at 1kHz - meeting AES17 professional audio specifications for master clock distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA842IDR | Lower GBW (200MHz), higher input voltage noise (2.6nV/√Hz), same SO-8 package and pinout. | Less suitable for >5MHz ADC buffering or 3rd-order intercept–critical IF stages due to reduced bandwidth and noise floor. | Select OPA842IDR only when 200MHz bandwidth suffices and cost sensitivity outweighs 0.6nV/√Hz noise advantage of OPA843IDR. |
| LMH6629MA/NOPB | Higher slew rate (1800V/µs), lower input offset (±100µV), but lower GBW (550MHz) and no guaranteed 0.01% settling spec. | Better for ultrafast pulse amplification but less validated for precision 12–16-bit converter interface where OPA843IDR's 10.5ns settling is documented. | Choose LMH6629MA/NOPB for sub-5ns transient response needs; retain OPA843IDR where datasheet-verified 0.01% settling and harmonic distortion specs are mandatory. |
Compared with OPA842IDR and LMH6629MA/NOPB, the OPA843IDR uniquely balances 800MHz GBW, 2.0nV/√Hz noise, and –96dBc distortion in a production-qualified SO-8 package - making it the preferred choice for high-SFDR, medium-gain, wideband signal chain nodes where both AC and DC precision are concurrently required.
Availability
OPA843IDR is available at Aetrix Electronics and suitable for ADC/DAC buffering, wideband transimpedance amplification, and professional audio line driving requiring stable component supply, long-term lifecycle assurance, and TI-qualified production lots.
Supply support for OPA843IDR 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 OPA843IDR belongs to TI's OPAx84x family of wideband voltage-feedback op amps, engineered specifically for high-dynamic-range signal conditioning in test & measurement, communications infrastructure, and professional audio equipment.
FAQ
What is the maximum recommended supply voltage for the OPA843IDR?
The absolute maximum supply voltage for the OPA843IDR is ±6.5VDC, but the specified operating range is ±4V to ±6V. Operation at ±6V is supported with 22.5mA maximum quiescent current and full AC/DC performance across –40°C to +85°C. Exceeding ±6V risks permanent damage per TI's absolute maximum ratings.
Does the OPA843IDR require external compensation for unity-gain stability?
No - the OPA843IDR is not unity-gain stable. It is optimized for minimum stable gain of +3 (noninverting) or –1 (inverting). For G = +1 applications, external compensation (e.g., dominant-pole capacitor across feedback resistor) is required. The datasheet specifies stable operation at G = +5 without compensation, with 260MHz bandwidth and >65MHz 0.1dB flatness.
Can the OPA843IDR drive a 50Ω load directly?
Yes - the OPA843IDR delivers ±100mA output current and is characterized into 100Ω and 50Ω loads. At G = +5 with RL = 50Ω, it sustains ±3.0V output swing (min) and maintains –96dBc 3rd-harmonic distortion. Layout best practices (short traces, local 0.1µF decoupling, ground plane) are essential to preserve this performance.
How does the OPA843IDR compare to the OPA643 in terms of upgrade path?
The OPA843IDR is explicitly positioned as an OPA643 upgrade, offering 2.5× higher GBW (800MHz vs 320MHz), 40% lower input voltage noise (2.0nV/√Hz vs 3.3nV/√Hz), and –96dBc vs –88dBc 3rd-harmonic distortion at 5MHz. It retains pin compatibility with OPA643 in SO-8 packages, enabling drop-in replacement in most existing layouts with improved dynamic range.
What thermal considerations apply to the OPA843IDR in SO-8 package?
The OPA843IDR in SO-8 (D) package has θJA = 125°C/W. With 20.2mA quiescent current at ±5V (200mW dissipation), junction temperature rise is ~25°C above ambient under still-air conditions. For continuous 100mA output into 100Ω, power dissipation increases to ~500mW - requiring thermal vias to inner ground planes and/or airflow to maintain TJ < 125°C.
OPA843IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA843IDR FAQ
1.How can I place an order for OPA843IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA843IDR 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 OPA843IDR reliable?
The price and inventory of OPA843IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA843IDR is usually 5 days.
3.What payment methods are accepted for OPA843IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA843IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA843IDR?
OPA843IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA843IDR 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 OPA843IDR?
For technical support, including OPA843IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA843IDR requirements.
6.How does Aetrix verify that OPA843IDR is sourced from the original manufacturer or authorized distributors?
All OPA843IDR 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 OPA843IDR meets industry standards.
7.What is the process for return or replacement of OPA843IDR?
All OPA843IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA843IDR, 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 OPA843IDR part is unused and in its original packaging.
Return procedure for OPA843IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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