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Texas Instruments OPA847IDG4
- Part No.:
- OPA847IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA847IDG4.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
OPA847IDG4 from Texas Instruments is a wideband, ultra-low-noise voltage-feedback operational amplifier with shutdown functionality, designed for high-dynamic-range signal conditioning. It delivers 3.9GHz gain bandwidth, 0.85nV/√Hz input voltage noise, and –105dBc harmonic distortion at 5MHz - enabling precision differential ADC driving, ultrasound channel amplification, and wideband transimpedance applications.
For engineers reviewing the OPA847IDG4 datasheet, OPA847IDG4 pinout, OPA847IDG4 application, or OPA847IDG4 equivalent, this page provides verified specifications, SO-8 package pin mapping, real-world use cases in ADC interfaces and photodiode amplifiers, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The OPA847IDG4 employs a voltage-feedback architecture optimized for stable operation at gains ≥ +12V/V, with external compensation enabling flat frequency response in both inverting (–40V/V) and noninverting (+20V/V) configurations. Its 950V/µs slew rate and 20ns settling time to 0.01% support high-fidelity large-signal amplification up to 350MHz closed-loop bandwidth.
It integrates a dedicated shutdown pin (Pin 8 in SO-8) that reduces supply current to <200µA while maintaining >70dB off-isolation at 5MHz. Input stage features 2.7kΩ || 2.0pF differential impedance and ±3.3V common-mode range at ±5V supplies, supporting direct interfacing with high-speed ADCs and photodiode sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 3.9GHz - enables 350MHz bandwidth at G = +20V/V for high-resolution ADC front-ends |
| Input Voltage Noise Density | 0.85nV/√Hz @ >1MHz - critical for low-noise transimpedance amplifiers with photodiodes |
| Slew Rate | 950V/µs - supports full-scale 2V step response within 2.2ns rise time for ultrasound imaging |
| Harmonic Distortion | –105dBc @ 5MHz, RL = 500Ω - ensures minimal spectral contamination in RF receiver chains |
| Supply Current | 18.1mA @ ±5V - balances performance and power in portable medical and test equipment |
| Shutdown Quiescent Current | <200µA - reduces system standby power by >99% in battery-powered instrumentation |
| Stable Gain Range | G ≥ +12V/V - allows high-gain preamplification without external compensation in most layouts |
Pinout & Package
OPA847IDG4 is packaged in an 8-pin SOIC (SO-8) with exposed pad, rated for –40°C to +85°C operation. Thermal resistance θJA = 125°C/W enables reliable operation at full output swing under continuous load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connection | Internally unconnected; must remain floating or grounded per layout best practices |
| 2 (In–) | Inverting Input | Differential node for feedback network connection; 2.7kΩ || 2.0pF impedance affects stability at high frequencies |
| 3 (In+) | Noninverting Input | High-impedance input node; requires 12kΩ-to-ground bias resistor in transimpedance designs to minimize offset error |
| 4 (–VS) | Negative Supply Rail | Accepts –5V to –6.5V; decoupling with 0.1µF + 6.8µF required within 5mm of pin |
| 5 (DIS) | Shutdown Control | Active-low enable; pulls low to reduce IQ to <200µA; floats high for normal operation |
| 6 (+VS) | Positive Supply Rail | Accepts +5V to +6.5V; same decoupling requirement as Pin 4 |
| 7 (OUT) | Output Driver | Capable of ±3.4V swing into 100Ω; drives ADC inputs directly with 20ns 0.01% settling |
| 8 (NC) | No Connection | Internally unconnected; no routing or thermal relief required |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 0.85nV/√Hz enables sub-picoampere-equivalent input noise in 10–100MHz photodiode amplifiers |
| High slew rate with fast settling | 950V/µs slew + 20ns to 0.01% allows clean 125MSPS ADC sampling without waveform distortion |
| Gain-stable architecture | Guaranteed stability at G ≥ +12V/V eliminates need for external compensation in most gain configurations |
| Low-distortion differential drive | –105dBc 2nd/3rd harmonic at 5MHz supports >90dB SFDR in 14-bit differential ADC interfaces |
| Integrated shutdown control | Sub-200µA quiescent current in shutdown mode enables power-gating in multi-channel ultrasound systems |
Applications
| High-Dynamic-Range ADC Preamplifier | Wideband Transimpedance Amplifier |
|---|---|
Use Scenario: Driving ADS5500 14-bit, 125MSPS ADC in communications test equipment with 2VPP differential input. IC Role / Device Role / Timing Role: Differential voltage gain stage providing 24.6dB gain, 350MHz bandwidth, and –105dBc distortion at converter input. Use Value: Enables >90dB spurious-free dynamic range (SFDR) without post-amplifier filtering or calibration. | Use Scenario: Converting photocurrent from 100pF OC-3 optical receiver diode into 2VPP analog signal at 155Mbps. IC Role / Device Role / Timing Role: Transimpedance amplifier with 12kΩ gain, 104MHz flat bandwidth, and 3.0pA/√Hz equivalent input noise. Use Value: Achieves industry-leading sensitivity by minimizing voltage-noise-limited detection floor. |
| Ultrasound Channel Amplifier | Low-Noise Differential Receiver |
Use Scenario: Front-end amplification in portable ultrasound probe with 5–15MHz transducer array. IC Role / Device Role / Timing Role: Time-gain-controlled (TGC) preamp delivering 2V step response in ≤2.2ns with 0.85nV/√Hz noise floor. Use Value: Preserves axial resolution and contrast-to-noise ratio (CNR) across full imaging depth. | Use Scenario: Receiving balanced RF signals from 1:2 transformer-coupled antenna in spectrum analyzer front-end. IC Role / Device Role / Timing Role: Differential gain block with 40V/V gain, 240MHz bandwidth, and 70dB off-isolation during shutdown. Use Value: Maintains signal integrity while enabling channel power cycling without PCB-level rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband, low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA846IDBVR | Lower input voltage noise (1.2nV/√Hz), higher GBP (1.75GHz), SOT-23-6 package | Better suited for space-constrained, lower-power (<15mA) portable instrumentation | Select when board area is critical and 1.75GHz GBP suffices for target bandwidth |
| LMH6624MF/NOPB | Higher input voltage noise (1.3nV/√Hz), lower GBP (1.5GHz), no shutdown pin | Cost-optimized solution for fixed-gain, non-power-gated industrial ADC drivers | Select when shutdown functionality is unnecessary and BOM cost reduction is prioritized |
Compared with OPA847IDG4, OPA846IDBVR trades 0.85→1.2nV/√Hz noise for smaller footprint and lower power, while LMH6624MF/NOPB sacrifices 3.9GHz bandwidth and shutdown capability for lower unit cost in volume production.
Availability
OPA847IDG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, medical ultrasound, optical receiver, and RF test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA847IDG4 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 over 50 years of innovation in precision amplifiers and signal chain solutions.
The OPA847IDG4 belongs to TI's Ultra-High-Speed Operational Amplifier product line, engineered specifically for wideband, low-noise signal conditioning in ADC interfaces, optical receivers, and medical imaging systems where dynamic range and fidelity are paramount.
FAQ
What is the minimum stable gain for OPA847IDG4?
The OPA847IDG4 is specified as stable for noninverting gains ≥ +12V/V. This is confirmed in the Electrical Characteristics table under "Stable for Gains ≥ 12" and verified by AC performance testing at G = +12, +20, and +50. Operation below +12V/V requires external compensation per Figure 8 in the datasheet. The OPA847IDG4 maintains phase margin >45° at G = +12 with standard SO-8 layout and proper decoupling.
Does OPA847IDG4 support inverting configuration?
Yes, OPA847IDG4 supports stable inverting operation down to G = –1V/V with external compensation. The datasheet demonstrates –40V/V performance with 240MHz bandwidth and –105dBc distortion. Inverting mode offers matched 50Ω input impedance and improved noise gain characteristics versus noninverting mode at the same signal gain. The OPA847IDG4 achieves this using RG = RS = 50Ω as both termination and gain-setting resistor.
What is the purpose of the DIS pin on OPA847IDG4?
The DIS (Disable) pin on OPA847IDG4 is Pin 8 in the SO-8 package and provides active-low shutdown control. When pulled below 1.5V, it disables the amplifier core and reduces quiescent current to <200µA - less than 1% of normal 18.1mA operation. The OPA847IDG4 retains >70dB input-to-output isolation during shutdown and powers up in 60ns. Leaving DIS unconnected or tied to +VS enables default operation.
Can OPA847IDG4 be used in transimpedance amplifier circuits?
Yes, OPA847IDG4 is explicitly recommended for wideband transimpedance applications due to its 0.85nV/√Hz input voltage noise, 3.9GHz GBP, and low input current noise (2.5pA/√Hz). The datasheet provides design equations and example circuits (e.g., Figure 3) for OC-3 receivers with 100pF diodes and 12kΩ gain. The OPA847IDG4 achieves 104MHz flat bandwidth and 3.0pA/√Hz equivalent input noise in such configurations.
What are the thermal limitations of OPA847IDG4 in SO-8 package?
OPA847IDG4 in SO-8 (D package) has a junction-to-ambient thermal resistance θJA of 125°C/W. At maximum rated supply (±6V) and full output swing into 100Ω, power dissipation reaches ~120mW, resulting in ~15°C junction rise above ambient. Derating is required above +85°C ambient; the device is rated for –40°C to +85°C operation. The OPA847IDG4 datasheet specifies maximum junction temperature as +150°C.
OPA847IDG4 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:
- 950V/µs
- Gain Bandwidth Product:
- 3.9 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 19 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 18.1mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA847IDG4 FAQ
1.How can I place an order for OPA847IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA847IDG4 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 OPA847IDG4 reliable?
The price and inventory of OPA847IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA847IDG4 is usually 5 days.
3.What payment methods are accepted for OPA847IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA847IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA847IDG4?
OPA847IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA847IDG4 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 OPA847IDG4?
For technical support, including OPA847IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA847IDG4 requirements.
6.How does Aetrix verify that OPA847IDG4 is sourced from the original manufacturer or authorized distributors?
All OPA847IDG4 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 OPA847IDG4 meets industry standards.
7.What is the process for return or replacement of OPA847IDG4?
All OPA847IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA847IDG4, 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 OPA847IDG4 part is unused and in its original packaging.
Return procedure for OPA847IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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