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Texas Instruments OPA846ID
- Part No.:
- OPA846ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA846ID.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:279
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Product details
Overview
OPA846ID from Texas Instruments is a wideband, low-noise, voltage-feedback operational amplifier optimized for high-dynamic-range ADC preamplifiers and transimpedance stages. It delivers 400MHz bandwidth at G = +10, 1.2nV/√Hz input voltage noise, 625V/µs slew rate, and ±150µV input offset voltage - enabling precision signal conditioning in ultrasound, VDSL, and security sensor front ends.
For engineers reviewing the OPA846ID datasheet, OPA846ID pinout, OPA846ID application, or OPA846ID equivalent, this page provides verified specifications, SO-8 package layout, real-world transimpedance design guidance, stable gain ≥7 operation, and validated alternatives for high-speed analog signal chains requiring ultra-low distortion and DC accuracy.
Technical Context
The OPA846ID uses a classical differential input stage followed by two forward-gain stages and a high-power output stage, delivering exceptional linearity (–100dBc 2nd-harmonic at 5MHz) and DC precision (90dB open-loop gain, ±150µV VIO). Its voltage-feedback architecture supports standard op amp configurations while maintaining stability down to G = +7.
It achieves 1.75GHz gain-bandwidth product with low 12.6mA quiescent current, enabling wideband transimpedance amplification where input voltage noise dominates - especially critical for photodiode interfaces with 10–100pF capacitance and >10kΩ feedback resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +10) | 400MHz - enables full-power response up to 200MHz for 2VPP signals in ADC driver applications. |
| Input Voltage Noise | 1.2nV/√Hz - dominant noise source in high-Z transimpedance designs; limits minimum detectable photocurrent. |
| Slew Rate | 625V/µs - supports fast settling of large-signal transients without slewing-induced distortion in pulse amplification. |
| Gain Bandwidth Product | 1750MHz - allows stable G = +20 operation (110MHz BW) or high-precision G = +7 (500MHz BW) with flat response. |
| Input Offset Voltage | ±150µV max - ensures <±4.1mV total output DC error in 10kΩ transimpedance circuits at 25°C. |
| Supply Current | 12.6mA - trimmed at +25°C with ±0.3mA tempco; enables predictable thermal design in multi-channel systems. |
| Stable Gain Minimum | G ≥ +7 - requires no external compensation for noninverting use; avoids instability in high-speed gain blocks. |
Pinout & Package
OPA846ID is packaged in an 8-pin SOIC (SO-8) surface-mount package with exposed pad (D package), rated for –40°C to +85°C operation. Pin 1 is marked with a dot; device orientation follows TI standard top-view labeling.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–) | High-impedance differential node; connects to feedback network in inverting configurations. |
| 2 | Noninverting Input (+) | High-impedance differential node; grounded via resistor in transimpedance bias networks. |
| 3 | Output | Capable of ±3.3V swing into 100Ω; drives ADC inputs or downstream gain stages directly. |
| 4 | –VS | Negative supply rail (–5V typical); must be decoupled with 0.1µF ceramic near pin. |
| 5 | +VS | Positive supply rail (+5V typical); requires local 0.1µF + 6.8µF decoupling per TI layout guidelines. |
| 6–8 | No Connection | Internally unconnected; left floating or tied to ground only if required for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low distortion | –100dBc 2nd-harmonic at 5MHz/G=+10/500Ω load - preserves SNR in 14-bit+ ADC front ends. |
| Flat gain response | 0.1dB flatness to 140MHz at G=+10 - eliminates frequency-dependent amplitude errors in wideband receivers. |
| High output drive | ±80mA sourcing/sinking - directly drives 50Ω transmission lines or 100Ω ADC inputs without buffering. |
| Low input bias current | –10µA max (VCM=0V) - minimizes offset error in high-RF transimpedance designs (>50kΩ). |
| Thermal stability | ±0.4µV/°C VOS drift - maintains calibration integrity over industrial temperature range. |
Applications
| Ultrasound Channel Amplifier | VDSL Line Receiver |
|---|---|
Use Scenario: Amplifies weak echo signals from piezoelectric transducers with 20–50pF capacitance and wide dynamic range requirements. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10kΩ–50kΩ RF, configured using external 0.2–1pF CF for Butterworth response. Use Value: 1.2nV/√Hz input noise enables detection of sub-mV echoes; 400MHz GBW supports >15MHz imaging bandwidth. |
Use Scenario: Receives asymmetric DSL signals over twisted-pair lines with high common-mode noise and tight THD specs. IC Role / Device Role / Timing Role: Low-noise differential receiver with G = +10, driven by transformer-coupled line interface. Use Value: 110dB CMRR and –100dBc distortion meet ITU-T G.992.3 spectral mask requirements at 12MHz. |
| Security Sensor Front End | High-Dynamic-Range ADC Preamplifier |
Use Scenario: Conditions low-level IR or microwave Doppler signals in perimeter intrusion detection systems. IC Role / Device Role / Timing Role: Single-supply or dual-supply gain block with DC-coupled input and rail-to-rail output swing. Use Value: ±3.3V output swing into 100Ω and 15ns 0.01% settling enable fast pulse capture without clipping or overshoot. |
Use Scenario: Drives 14–16-bit SAR or pipeline ADCs requiring >90dB SFDR and minimal group delay variation. IC Role / Device Role / Timing Role: G = +10 noninverting buffer with matched 50Ω source/load termination per TI Figure 1. Use Value: 625V/µs slew rate prevents slewing-induced harmonic distortion; 1.2nV/√Hz noise preserves ENOB at full scale. |
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 |
|---|---|---|---|
| OPA847 | Lower 0.85nV/√Hz noise, higher 3.9GHz GBP, but requires G ≥ +10 for stability and draws 16.5mA. | Better for ultra-low-noise transimpedance where gain ≥ +10 is acceptable and power budget allows +3.9mA. | Select OPA847 when noise floor is limiting and minimum gain constraint aligns with system architecture. |
| LMH6624 | Higher 2.3nV/√Hz noise, lower 1.5GHz GBP, but stable at G = +1 and consumes only 10.5mA. | Suitable for unity-gain buffers or low-gain instrumentation where bandwidth ≤ 250MHz suffices. | Choose LMH6624 when gain flexibility below +7 is required and 1.2nV/√Hz noise margin is not critical. |
Compared with OPA846ID, OPA847 offers superior noise and bandwidth but sacrifices gain flexibility and increases power; LMH6624 trades noise and speed for universal stability and lower quiescent current - making OPA846ID the optimal balance for G ≥ +7, low-noise, high-SFDR applications.
Availability
OPA846ID is available at Aetrix Electronics and suitable for ultrasound channel amplifiers, VDSL line receivers, and high-dynamic-range ADC preamplifiers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA846ID 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 amps and signal chain solutions.
The OPA846ID belongs to TI's OPA84x family of wideband voltage-feedback op amps, engineered specifically for demanding RF, medical imaging, and communications infrastructure applications where simultaneous low noise, high speed, and DC precision are essential.
FAQ
What is the minimum stable gain for OPA846ID?
The OPA846ID is stable for noninverting gains ≥ +7 and inverting gains ≥ –7. Operation below this gain requires external compensation, such as the low-gain technique shown in TI's Figure 5 using CS and CF to shape noise gain - enabling stable G = –2 with 142MHz bandwidth and improved SFDR.
Can OPA846ID drive a 50Ω load directly?
Yes, OPA846ID can drive a 50Ω load directly: it delivers ±3.3V output swing and ±80mA output current into 100Ω, and maintains >±2.9V swing into 100Ω per datasheet Table 1. For 50Ω, expect ~±2.5V swing; TI recommends series 22Ω isolation resistor to improve stability with capacitive loads.
What is the input voltage noise density of OPA846ID?
The OPA846ID has a guaranteed maximum input voltage noise density of 1.5nV/√Hz at +85°C, with a typical value of 1.2nV/√Hz at +25°C (f > 1MHz). This low noise is critical in transimpedance applications where diode capacitance amplifies voltage noise into current-referred noise.
Does OPA846ID require external compensation for G = +10 operation?
No, OPA846ID does not require external compensation for G = +10 operation. It is internally compensated and specified for stable operation at gains ≥ +7. The 400MHz bandwidth, 0.1dB flatness to 140MHz, and –100dBc distortion at 5MHz are all measured under uncompensated G = +10 conditions per Figure 1 test circuit.
What package options are available for OPA846ID?
OPA846ID is offered exclusively in the SO-8 (D) package - 8-pin small-outline integrated circuit with standard 1.27mm pitch, JEDEC MS-012AC compliant, and rated for –40°C to +85°C operation. The ordering variant OPA846IDBVT uses SOT-23-5 (DBV), but OPA846ID itself is SO-8 only.
OPA846ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 625V/µs
- Gain Bandwidth Product:
- 1.75 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 µA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 12.6mA
- Current - Output / Channel:
- 80 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
OPA846ID FAQ
1.How can I place an order for OPA846ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA846ID 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 OPA846ID reliable?
The price and inventory of OPA846ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA846ID is usually 5 days.
3.What payment methods are accepted for OPA846ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA846ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA846ID?
OPA846ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA846ID 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 OPA846ID?
For technical support, including OPA846ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA846ID requirements.
6.How does Aetrix verify that OPA846ID is sourced from the original manufacturer or authorized distributors?
All OPA846ID 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 OPA846ID meets industry standards.
7.What is the process for return or replacement of OPA846ID?
All OPA846ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA846ID, 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 OPA846ID part is unused and in its original packaging.
Return procedure for OPA846ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA846ID Tags
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