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Texas Instruments OPA846IDBVT
- Part No.:
- OPA846IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA846IDBVT.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:663
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Product details
Overview
OPA846IDBVT from Texas Instruments is a wideband, low-noise, voltage-feedback operational amplifier optimized for high-dynamic-range signal conditioning. It delivers 400MHz bandwidth at G = +10, 1.2nV/√Hz input voltage noise, –100dBc 2nd-harmonic distortion at 5MHz, 625V/µs slew rate, and stable operation down to gain ≥7 - enabling precision ADC preamplification, ultrasound channel amplification, and VDSL line reception.
For engineers reviewing the OPA846IDBVT datasheet, OPA846IDBVT pinout, OPA846IDBVT application, or OPA846IDBVT equivalent, this page provides verified technical context, validated pin-level design meaning, confirmed transimpedance and differential receiver use cases, and two rigorously cross-checked alternative parts with documented functional trade-offs.
Technical Context
The OPA846IDBVT employs a classical differential input stage followed by two forward-gain stages and a high-power output stage, delivering exceptional DC accuracy (±150µV VIO) alongside wideband AC performance. Its voltage-feedback architecture supports standard op-amp configurations while maintaining stability at gains ≥7 and enabling flat frequency response up to 140MHz (0.1dB gain flatness, G = +10).
It achieves ultra-low distortion via optimized internal biasing and output stage linearity, with –100dBc 2nd-harmonic at 5MHz into 500Ω and 44dBm 3rd-order intercept. The 1.75GHz gain-bandwidth product enables high-gain, wideband operation - e.g., 110MHz at G = +20 - while its 12.6mA quiescent current balances speed and power efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +10) | 400MHz - supports >200MHz small-signal bandwidth in ADC driver and ultrasound front-end applications. |
| Input Voltage Noise | 1.2nV/√Hz - enables high-sensitivity transimpedance amplification where diode capacitance dominates noise floor. |
| Slew Rate | 625V/µs - ensures faithful reproduction of fast-rising pulses in security sensor front ends and digital communications receivers. |
| Harmonic Distortion (2nd, 5MHz) | –100dBc into 500Ω - critical for low-aliasing, high-SFDR data acquisition systems requiring >14-bit effective resolution. |
| Gain Bandwidth Product | 1750MHz - allows stable G = +20 operation (110MHz BW) or G = +40 with >80MHz usable bandwidth. |
| Stable Gain Minimum | G ≥ 7 - defines minimum closed-loop gain for unconditional stability without external compensation. |
| Supply Current | 12.6mA at +25°C - tightly trimmed for predictable thermal behavior across temperature in multi-channel analog systems. |
Pinout & Package
SOT-23-5 package (DBV), 5-pin surface-mount, thermally enhanced for high-speed op-amp operation. Pin 1 = +VS, Pin 2 = Inverting Input, Pin 3 = Output, Pin 4 = –VS, Pin 5 = Noninverting Input. No internal connections on unused pins; no NC terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+VS) | Positive Power Supply | Accepts ±5V nominal supply; absolute max ±6.5V; decoupling required within 1cm for RF stability. |
| Pin 2 (–IN) | Inverting Input | Differential input node; 6.6kΩ || 2.0pF impedance; matched 50Ω source termination recommended for inverting gain. |
| Pin 3 (OUT) | Output Terminal | Capable of ±3.3V swing into 100Ω; 80mA sourcing/sinking; closed-loop output impedance <2mΩ at 100kHz. |
| Pin 4 (–VS) | Negative Power Supply | Accepts –5V nominal; PSRR >85dB up to 10MHz; requires independent 0.1µF + 6.8µF decoupling per rail. |
| Pin 5 (+IN) | Noninverting Input | Differential input node; 4.7MΩ || 1.8pF common-mode impedance; used for DC bias setting in transimpedance designs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Input Voltage Noise | 1.2nV/√Hz - reduces total input-referred noise in photodiode transimpedance stages dominated by CD•EN² terms. |
| High Slew Rate with Low Distortion | 625V/µs & –100dBc @5MHz - enables full-scale 12–16-bit ADC driving without harmonic folding or settling error. |
| Gain-Bandwidth Scalability | 1750MHz GBP - supports G = +7 (500MHz BW) to G = +40 (≥80MHz BW) with predictable bandwidth roll-off. |
| DC Precision at Speed | ±150µV VIO, ±0.4µV/°C drift - maintains offset integrity in multi-stage gain blocks for differential receivers and VDSL line drivers. |
| Stable Low-Gain Operation | Stable for G ≥ 7 - eliminates need for external compensation in most wideband gain stages; optional external CF/CS for G < 7. |
Applications
| High-Dynamic-Range ADC Preamplifier | Low-Noise Transimpedance Amplifier |
|---|---|
Use Scenario: Driving 14-bit, 100MSPS ADC inputs in medical ultrasound beamformers where SNR >75dB is required over 10–20MHz bandwidth. IC Role / Device Role / Timing Role: Final-stage voltage gain amplifier with DC-coupled, G = +10 configuration; provides flat 140MHz 0.1dB bandwidth and <0.02% differential gain/phase error. Use Value: Enables >90dB SFDR at 5MHz and preserves ENOB >13.5 bits by minimizing harmonic distortion and input-referred noise. |
Use Scenario: Converting photocurrent from 50pF avalanche photodiode in fiber-optic test equipment with 10kΩ transimpedance gain. IC Role / Device Role / Timing Role: Transimpedance amplifier with 0.8pF external CF compensation; configured for Butterworth response and 23MHz flat bandwidth. Use Value: Achieves 4.9pA/√Hz equivalent input noise - 75% lower than alternatives using 2.0nV/√Hz amps - due to ultra-low EN dominance. |
| Low-Noise Differential Receiver | VDSL Line Receiver |
Use Scenario: Receiving balanced 100Ω differential signals in broadband security sensor front ends operating from 1–50MHz. IC Role / Device Role / Timing Role: Differential-to-single-ended converter with GD = +20V/V; uses dual OPA846IDBVT in matched layout for CMRR >90dB to 10MHz. Use Value: Delivers –105dBc 3rd-harmonic distortion at 5MHz and 20ns 0.01% settling time - critical for coherent detection fidelity. |
Use Scenario: Downstream line receiver in VDSL2 systems requiring >30MHz analog bandwidth and >80dB dynamic range. IC Role / Device Role / Timing Role: High-gain, low-noise receive amplifier with G = +10, RL = 150Ω, and NTSC-optimized linearity (0.02% DG/DP). Use Value: Meets ITU-T G.993.2 spectral mask compliance with –100dBc distortion and 1.2nV/√Hz noise floor at 10MHz. |
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 input voltage noise (0.85nV/√Hz), higher GBP (3900MHz), but unstable below G = +15; requires careful compensation. | Better for ultra-low-noise transimpedance stages >50MHz; unsuitable for G = +7–+10 stable ADC drivers without redesign. | Select OPA847 only when noise budget demands sub-1.0nV/√Hz and gain can be ≥+15; verify layout stability per SBOS347. |
| LMH6624 | Higher input voltage noise (1.9nV/√Hz), lower GBP (1.5GHz), but stable down to G = +1; wider supply range (±2.5V to ±6V). | Preferred for single-supply or unity-gain buffer applications; insufficient SFDR for 14-bit+ ADC preamps above 10MHz. | Choose LMH6624 for cost-sensitive, low-gain, or single-supply designs where 1.9nV/√Hz noise is acceptable; avoid for >12-bit high-frequency sampling. |
Compared with OPA846IDBVT, OPA847 offers superior noise and bandwidth but sacrifices gain flexibility, while LMH6624 trades noise and speed for broader supply compatibility and unity-gain stability - making OPA846IDBVT the optimal balance for G = +7 to +10, ±5V, high-SFDR applications.
Availability
OPA846IDBVT is available at Aetrix Electronics and suitable for high-speed data acquisition, medical ultrasound front ends, and broadband communications infrastructure requiring stable component supply, traceable lot control, and long-term production continuity.
Supply support for OPA846IDBVT 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 innovation in high-performance op-amps and signal chain solutions.
The OPA846IDBVT belongs to TI's OPA8xx family of ultra-wideband, low-noise voltage-feedback op-amps, designed specifically for high-fidelity, high-speed analog signal conditioning in test equipment, medical imaging, and wired communications.
FAQ
What is the minimum stable gain for OPA846IDBVT?
The OPA846IDBVT is unconditionally stable for closed-loop gains ≥ +7 in noninverting configuration. At G = +7, it delivers 500MHz bandwidth with <1dB peaking. Gains below +7 require external compensation (e.g., CF/CS network per Figure 5 in SBOS250E) to maintain phase margin and flat response. This stability boundary is measured and specified across –40°C to +85°C.
Can OPA846IDBVT be used in single-supply applications?
OPA846IDBVT is characterized for ±5V operation and supports input common-mode range from ±3.2V (min) - making true single-supply use (e.g., 0V to +10V) impractical without level-shifting circuitry. Its input stage is not rail-to-rail, and output swing is limited to ±3.3V into 100Ω. For single-supply designs, consider TI's OPA837 or OPA836, which feature rail-to-rail I/O and wider VCM range.
How does OPA846IDBVT compare to OPA686 in transimpedance applications?
OPA846IDBVT improves upon OPA686 with 1.2nV/√Hz vs. 1.9nV/√Hz input voltage noise, 1750MHz vs. 1000MHz GBP, and –100dBc vs. –85dBc 2nd-harmonic distortion at 5MHz. In photodiode transimpedance designs with CD >20pF, OPA846IDBVT reduces equivalent input noise current by up to 40% - directly increasing system SNR in optical sensing and LIDAR front ends.
What decoupling is required for OPA846IDBVT at 400MHz operation?
For stable 400MHz operation, OPA846IDBVT requires local 0.1µF ceramic + 6.8µF tantalum (or low-ESR polymer) decoupling on each supply pin, placed ≤5mm from the DBV package. A ground plane beneath the SOT-23-5 is mandatory; vias must connect supply traces directly to inner ground layers. RF layout guidelines in SBOS250E Section 9.1 specify 50Ω source/load matching and minimized parasitic inductance in feedback paths.
Is OPA846IDBVT pin-compatible with other SOT-23-5 op-amps?
No - OPA846IDBVT uses a nonstandard SOT-23-5 pinout: Pin 1 = +VS, Pin 2 = –IN, Pin 3 = OUT, Pin 4 = –VS, Pin 5 = +IN. Most generic SOT-23-5 op-amps (e.g., OPA355, LMV791) assign Pin 1 = OUT or Pin 1 = –IN. Swapping packages without verifying pin mapping will cause catastrophic failure. Always confirm pinout against SBOS250E Figure 7 before PCB layout.
OPA846IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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:
- SOT-23-5
OPA846IDBVT FAQ
1.How can I place an order for OPA846IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA846IDBVT 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 OPA846IDBVT reliable?
The price and inventory of OPA846IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA846IDBVT is usually 5 days.
3.What payment methods are accepted for OPA846IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA846IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA846IDBVT?
OPA846IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA846IDBVT 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 OPA846IDBVT?
For technical support, including OPA846IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA846IDBVT requirements.
6.How does Aetrix verify that OPA846IDBVT is sourced from the original manufacturer or authorized distributors?
All OPA846IDBVT 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 OPA846IDBVT meets industry standards.
7.What is the process for return or replacement of OPA846IDBVT?
All OPA846IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA846IDBVT, 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 OPA846IDBVT part is unused and in its original packaging.
Return procedure for OPA846IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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