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Texas Instruments OPA380AIDGKTG4
- Part No.:
- OPA380AIDGKTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA380AIDGKTG4.pdf
- Description:
- IC TRANSIMPEDANCE 1 CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,287
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Product details
Overview
OPA380AIDGKTG4 from Texas Instruments is a precision transimpedance amplifier optimized for high-speed photodiode current-to-voltage conversion, featuring 90MHz gain bandwidth, 25µV max offset voltage, 0.1µV/°C max drift, 50pA max input bias current, and 1MHz transimpedance bandwidth in typical configurations. It enables accurate optical signal conditioning in medical imaging front-ends and fiber-optic power monitoring.
For engineers reviewing the OPA380AIDGKTG4 datasheet, OPA380AIDGKTG4 pinout, OPA380AIDGKTG4 application, or OPA380AIDGKTG4 equivalent, key selection criteria include transimpedance bandwidth stability across photodiode capacitance variations, output swing to 0V with external pulldown resistor, low 1/f noise for DC-coupled optical sensing, and guaranteed performance from –40°C to +125°C in MSOP-8 packaging.
Technical Context
The OPA380AIDGKTG4 integrates an auto-zero core with a continuous-time 90MHz high-speed amplifier, correcting offset every 100µs without introducing significant 10kHz aliasing energy. Its internal architecture eliminates phase inversion during input overvoltage and supports stable operation with photodiode capacitances up to 100pF when compensated with feedback capacitor CF.
It operates in inverting configuration with noninverting input biased externally, delivering >1MHz transimpedance bandwidth using RF = 1MΩ and CF ≈ 0.5–5pF depending on CDIODE. Output swing extends to 0V via optional RP pulldown resistor to –5V, enabling true single-supply 0V-to-4.4V output range with <1mV linearity error near ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 90MHz - Enables >1MHz transimpedance bandwidth with typical photodiode capacitance (10–100pF) and RF up to 10MΩ. |
| Input Offset Voltage | 25µV (max) - Ensures ≤10nA measurement error at 1MΩ transimpedance gain, critical for sub-µA photodiode currents. |
| Input Bias Current | 50pA (max) - Minimizes dark-current-induced offset in high-impedance photodiode nodes. |
| Offset Drift | 0.1µV/°C (max) - Guarantees <1µV total drift over 85°C industrial temperature range, preserving calibration stability. |
| Supply Range | 2.7V to 5.5V - Supports direct interface with 3.3V and 5V logic/system rails without level-shifting. |
| Quiescent Current | 7.5mA - Enables high-speed precision without excessive thermal load in compact MSOP-8 package (θJA = 150°C/W). |
| Transimpedance BW | 1MHz - Verified with 100pF photodiode capacitance and 1MΩ feedback resistor, per Figure 7 characterization. |
Pinout & Package
OPA380AIDGKTG4 is housed in an MSOP-8 package (3.0mm × 3.0mm × 1.0mm), thermally enhanced for high-precision analog operation in space-constrained optical modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Not bonded; must be left floating or grounded per layout best practice-no functional impact. |
| 2 (V+) | Positive supply rail | Accepts 2.7V–5.5V; requires local 1µF ceramic bypass to minimize supply-induced noise coupling into transimpedance node. |
| 3 (Out) | Amplifier output | Drives 2kΩ load within 600mV of V+ and 100mV of V−; supports 0V swing when RP pulldown to –5V is applied. |
| 4 (NC) | No internal connection | Not bonded; must be left floating-no routing or thermal pad connection required. |
| 5 (NC) | No internal connection | Not bonded; electrically isolated-no PCB trace or copper pour connection advised. |
| 6 (–In) | Inverting input | Summing junction for photodiode anode; ultra-low bias current (50pA max) preserves signal integrity in high-Z current paths. |
| 7 (+In) | Noninverting input | Fixed bias reference point; typically tied to V+/2 or filtered DC voltage to set output common-mode and reverse-bias photodiode. |
| 8 (V−) | Negative supply rail | Ground or negative rail (e.g., –5V); establishes output swing lower limit and enables rail-to-rail output extension with RP. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero + high-speed composite architecture | Combines 100µs zero-correction cycle with 90MHz GBW signal path-eliminates 1/f noise while maintaining MHz-range settling. |
| Output swing to 0V capability | Enabled by external 2kΩ pulldown resistor (RP) to –5V-achieves full-scale 0V–4.4V output without dual supply. |
| Photodiode-optimized input stage | 10¹³Ω || 3pF common-mode impedance and 1.1pF differential capacitance minimize noise gain peaking with capacitive sources. |
| Overload recovery time | 100ns recovery from positive-rail saturation-critical for fast optical pulse detection and closed-loop fiber power control. |
| Long-term VOS stability | ≤1µV variation after 300-hour life test at 150°C-ensures calibration retention in medical and industrial equipment with 10+ year lifecycles. |
Applications
| Photodiode Monitoring | Precision I/V Conversion |
|---|---|
Use Scenario: Real-time detection of low-light-level signals from silicon or InGaAs photodiodes in portable spectrometers and environmental sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent (1nA–100µA) into proportional voltage with 4–5 decade dynamic range. Use Value: 25µV offset and 0.1µV/°C drift enable ±0.1% full-scale accuracy over temperature without recalibration. | Use Scenario: High-fidelity conversion of leakage or sensor currents in battery management systems and semiconductor test equipment. IC Role / Device Role / Timing Role: Precision current-sense front-end with 50pA input bias current minimizing error in picoampere-range measurements. Use Value: 90MHz GBW ensures <2µs settling for 4V steps-supports high-throughput automated test sequences. |
| Optical Amplifiers | CAT-Scanner Front-End |
Use Scenario: Gain stabilization and power-level feedback in EDFA and Raman optical amplifiers requiring fast response to input power fluctuations. IC Role / Device Role / Timing Role: High-bandwidth transimpedance stage monitoring tap photodiode output for real-time AGC loop control. Use Value: 1MHz transimpedance bandwidth allows tracking of >500kHz optical power modulation-enabling tight gain control in C-band systems. | Use Scenario: X-ray detector signal conditioning in computed tomography systems where low-noise, wide-dynamic-range current measurement is essential. IC Role / Device Role / Timing Role: First-stage I/V converter for scintillator-photodiode arrays, operating in high-reliability medical-grade environment. Use Value: Specified –40°C to +125°C operation and long-term VOS stability meet IEC 60601-1 requirements for diagnostic imaging hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA300IDBVR | 150MHz GBW, higher 500pA max input bias current, no auto-zero-higher broadband noise but faster raw speed. | Better suited for >5MHz transimpedance bandwidth needs where photodiode capacitance is <5pF; less suitable for sub-100nA DC-coupled sensing. | Select OPA300IDBVR only when bandwidth >1.5MHz is mandatory and offset drift tolerance exceeds 1µV/°C. |
| OPA335AIDBVR | 10µV max offset, zero-drift architecture, 380kHz GBW-superior DC precision but insufficient speed for >100kHz optical modulation. | Ideal for ultra-stable DC or low-frequency (<10kHz) current measurement; cannot support CAT-scan pulse trains or fiber AGC loops. | Choose OPA335AIDBVR when long-term offset stability dominates over bandwidth-e.g., laboratory-grade photometry. |
Compared with OPA300IDBVR and OPA335AIDBVR, the OPA380AIDGKTG4 uniquely balances 90MHz GBW, 25µV offset, and 50pA bias current-making it the only option among the three capable of sustaining 1MHz transimpedance bandwidth while maintaining sub-µV/°C drift and nA-level accuracy across industrial temperature range.
Availability
OPA380AIDGKTG4 is available at Aetrix Electronics and suitable for photodiode monitoring, precision I/V conversion, and optical amplifier feedback applications requiring stable component supply, extended temperature operation, and guaranteed long-term calibration integrity.
Supply support for OPA380AIDGKTG4 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 precision op amps and signal-chain solutions.
The OPA380AIDGKTG4 belongs to TI's precision transimpedance amplifier product line, engineered specifically for high-speed, low-noise optical current sensing in medical imaging, fiber-optic communications, and analytical instrumentation.
FAQ
What is the maximum photodiode capacitance supported by OPA380AIDGKTG4 while maintaining 1MHz transimpedance bandwidth?
The OPA380AIDGKTG4 maintains ≥1MHz transimpedance bandwidth with photodiode capacitances up to 100pF when using RF = 1MΩ and CF = 0.5–5pF, as verified in Figure 7 of the SBOS291G datasheet. At CDIODE = 100pF, the measured –3dB point remains at 1MHz with appropriate compensation. Exceeding 100pF requires reducing RF or adding filtering, which trades bandwidth for stability.
Does OPA380AIDGKTG4 require external components to achieve 0V output swing?
Yes, OPA380AIDGKTG4 achieves true 0V output swing only when an external 2kΩ pulldown resistor (RP) is connected between VOUT (Pin 3) and a –5V supply, as shown in Figure 3 of the datasheet. Without RP, the output swings to within 100mV of V− (ground). The OPA380AIDGKTG4 output stage is specifically designed to operate linearly under this pulldown condition across –40°C to +125°C.
How does the auto-zero architecture of OPA380AIDGKTG4 affect its noise performance?
The OPA380AIDGKTG4 uses a proprietary time-continuous auto-zero technique that corrects offset every 100µs without introducing significant 10kHz fundamental noise-internal filtering suppresses residual correction energy above 20MHz. This yields ultra-low 1/f noise (3µVPP, 0.1Hz–10Hz) while preserving 67nV/√Hz broadband voltage noise at 10kHz, making it optimal for DC-coupled optical sensing where both low-frequency stability and high-frequency fidelity matter.
Can OPA380AIDGKTG4 be used with single-supply 3.3V operation?
Yes, OPA380AIDGKTG4 is fully specified for 2.7V to 5.5V supply operation, including 3.3V. At VS = 3.3V, it delivers 7.5mA quiescent current, 25µV max offset, and maintains 1MHz transimpedance bandwidth with appropriate RF/CF selection. Output swing is limited to ~0.6V above V− and ~0.4V below V+, so for 0V–3.0V output range, a pulldown resistor to –1.8V (not –5V) may be used per application note SBOA055.
What is the recommended PCB layout practice for OPA380AIDGKTG4 to minimize noise in photodiode applications?
TI recommends minimizing stray capacitance at the inverting input (Pin 6) by using a guard ring driven at +In (Pin 7) potential, placing RF and CF as close as possible to Pin 6, and cleaning flux residues thoroughly to prevent board leakage. Photodiode cathode should connect directly to V+ (Pin 2) with short trace; anode connects to Pin 6. Avoid routing digital traces near the summing junction, and use dedicated ground plane beneath the MSOP-8 footprint to reduce thermal EMF errors.
OPA380AIDGKTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Transimpedance
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 80V/µs
- Gain Bandwidth Product:
- 90 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 3 pA
- Voltage - Input Offset:
- 4 µV
- Current - Supply:
- 7.5mA
- Current - Output / Channel:
- 150 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA380AIDGKTG4 FAQ
1.How can I place an order for OPA380AIDGKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA380AIDGKTG4 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 OPA380AIDGKTG4 reliable?
The price and inventory of OPA380AIDGKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA380AIDGKTG4 is usually 5 days.
3.What payment methods are accepted for OPA380AIDGKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA380AIDGKTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA380AIDGKTG4?
OPA380AIDGKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA380AIDGKTG4 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 OPA380AIDGKTG4?
For technical support, including OPA380AIDGKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA380AIDGKTG4 requirements.
6.How does Aetrix verify that OPA380AIDGKTG4 is sourced from the original manufacturer or authorized distributors?
All OPA380AIDGKTG4 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 OPA380AIDGKTG4 meets industry standards.
7.What is the process for return or replacement of OPA380AIDGKTG4?
All OPA380AIDGKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA380AIDGKTG4, 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 OPA380AIDGKTG4 part is unused and in its original packaging.
Return procedure for OPA380AIDGKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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