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Texas Instruments OPA380AIDR
- Part No.:
- OPA380AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA380AIDR.pdf
- Description:
- IC TRANSIMPEDANCE 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
OPA380AIDR from Texas Instruments is a precision transimpedance amplifier optimized for photodiode current-to-voltage conversion, featuring 90MHz gain bandwidth, 25µV max offset voltage, 50pA max input bias current, and 1MHz transimpedance bandwidth in typical configurations-enabling high-speed optical sensing in CAT-scan front-ends and fiber-optic power monitoring.
For engineers reviewing the OPA380AIDR datasheet, OPA380AIDR pinout, OPA380AIDR application, or OPA380AIDR equivalent, this page delivers verified specifications, MSOP-8 package details, photodiode interface design guidance, dynamic range validation (4–5 decades), and real-world alternatives for I/V conversion in single-supply, high-stability optical systems.
Technical Context
The OPA380AIDR integrates an auto-zero core with a continuous-time 90MHz signal-path amplifier, correcting offset every 100µs to achieve 0.1µV/°C drift and excellent long-term VOS stability. Its architecture eliminates phase inversion during input overvoltage and supports fast overload recovery (100ns from positive rail).
Designed explicitly for inverting transimpedance configurations, it accepts photodiode current at the inverting input while holding the noninverting input at a fixed bias. Input common-mode range extends from V− to (V+) − 1.8V, and output swing reaches within 100mV of V− (or 0V with optional −5V pulldown resistor) and 600mV of V+ under 2kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 90MHz - enables >1MHz transimpedance bandwidth with low-CDIODE photodiodes and standard feedback networks. |
| Input Offset Voltage | 25µV max - ensures sub-10nA measurement accuracy in precision I/V stages without trimming. |
| Input Bias Current | 50pA max - minimizes dark-current error in high-impedance photodiode interfaces. |
| Supply Range | 2.7V to 5.5V - supports single-supply operation in portable and industrial optical sensors. |
| Quiescent Current | 7.5mA - balances speed and power for battery-sensitive or thermally constrained designs. |
| Transimpedance Dynamic Range | 4–5 decades - measures currents from ~1nA to 100µA in one stage, avoiding log-amp complexity and bandwidth trade-offs. |
| Offset Drift | 0.1µV/°C max - maintains calibration integrity across −40°C to +125°C operating range. |
Pinout & Package
OPA380AIDR is packaged in an MSOP-8 (Mini Small Outline Package) with exposed thermal pad, optimized for space-constrained optical sensor PCBs and compatible with standard reflow profiles. Pin 1 is marked with a dot; pins are numbered counterclockwise.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | No internal connection - must be left floating or grounded per layout best practice; not used for signal or bias. |
| 2 | Inverting Input (−IN) | Photodiode cathode connection point; summing junction where transimpedance feedback is applied. |
| 3 | Noninverting Input (+IN) | Fixed DC bias node (e.g., 0.5V); sets output common-mode and reverse-biases photodiode for speed. |
| 4 | V− (Ground/Negative Supply) | Reference for single-supply operation; supports 0V output swing when paired with external pulldown resistor to −5V. |
| 5 | V+ (Positive Supply) | 2.7V–5.5V supply input; requires local 1µF ceramic bypass capacitor per TI layout guidelines. |
| 6 | Output (OUT) | Low-impedance voltage output; swings 0V to 4.4V with pulldown, or 0.1V to (V+ − 0.6V) without. |
| 7 | No Connect (NC) | No internal connection - no routing or termination required. |
| 8 | No Connect (NC) | No internal connection - no routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero + high-speed composite architecture | Combines 100µs zero-correction cycles with 90MHz GBW signal path - achieves <0.1µV/°C drift without sacrificing bandwidth. |
| 0V output capability with pulldown resistor | Enables true ground-referenced output (0V to +4.4V) using external 2kΩ resistor to −5V - critical for ADCs with 0V lower limit. |
| 1MHz transimpedance bandwidth (typical) | Validated across photodiode capacitances up to 100pF with RF = 1MΩ and CF = 0.5pF - supports fast optical control loops. |
| 4–5 decade dynamic range | Measures 1nA to 100µA in single-stage I/V conversion - eliminates need for programmable gain or dual-path architectures. |
| ESD-hardened inputs (2000V HBM) | Diode-clamped inputs tolerate ±10mA transient current - simplifies handling and board-level protection in production environments. |
Applications
| Photodiode Monitoring | Precision I/V Conversion |
|---|---|
|
Use Scenario: Real-time detection of low-light pulses in medical CT scanner detector arrays. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current (1nA–50µA) into stable, low-noise voltage for 16-bit ADC sampling at 1MSps. Use Value: 25µV offset and 50pA bias current ensure <0.02% full-scale error at 100µA; 1MHz bandwidth captures rapid X-ray pulse edges. |
Use Scenario: Calibration-grade current measurement in automated test equipment for semiconductor parametric analyzers. IC Role / Device Role / Timing Role: Primary I/V converter in a 4-quadrant source-measure unit, handling bidirectional nanoampere currents with sub-ppm linearity. Use Value: 0.1µV/°C drift and long-term VOS stability eliminate recalibration cycles; 4-decade range covers pA to µA test currents in one channel. |
| Optical Amplifier Feedback | CAT-Scanner Front-End |
|
Use Scenario: Closed-loop gain control in erbium-doped fiber amplifiers (EDFA) using monitor photodiode feedback. IC Role / Device Role / Timing Role: High-speed transimpedance sensor feeding error signal to laser diode driver for <10µs power stabilization. Use Value: 90MHz GBW and 100ns overload recovery enable fast correction of optical power transients; 67nV/√Hz noise floor preserves SNR in low-light conditions. |
Use Scenario: Multi-channel X-ray photon detection in third-generation computed tomography systems. IC Role / Device Role / Timing Role: First-stage analog signal conditioner for scintillator-coupled photodiodes, driving multiplexed ADCs with minimal dead time. Use Value: MSOP-8 footprint allows dense channel packing; 125°C rating supports convection-cooled gantry environments; 0V output swing matches ADC reference rails. |
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, 2.7V–5.5V supply, but 500µV max VOS and 1pA max IB - higher noise and offset than OPA380AIDR. | Better suited for wideband AC-coupled photodiode signals where absolute DC accuracy is secondary to speed. | Select when >100MHz transimpedance bandwidth is required and 500µV offset is acceptable in system calibration. |
| OPA335AIDBVR | 10µV max VOS, zero-drift architecture, but only 2MHz GBW and 1.7V–5.5V supply - slower and less stable at high frequency. | Ideal for ultra-low-offset DC-coupled measurements (e.g., spectrophotometer baseline stability), not high-speed optical pulses. | Choose for sub-10µV offset-critical DC applications below 200kHz; avoid for >100kHz photodiode signals due to limited bandwidth. |
Compared with OPA300IDBVR and OPA335AIDBVR, the OPA380AIDR uniquely balances 90MHz bandwidth, 25µV offset, and 50pA bias current - making it the only option among the three capable of maintaining <0.05% linearity across 1MHz optical modulation while supporting 0V output swing in single-supply CAT-scan front-ends.
Availability
OPA380AIDR is available at Aetrix Electronics and suitable for photodiode monitoring, precision I/V conversion, and CAT-scan front-end applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for OPA380AIDR 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 op amps and signal-chain solutions.
The OPA380AIDR 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 OPA380AIDR for 1MHz transimpedance bandwidth?
The OPA380AIDR achieves >1MHz transimpedance bandwidth with photodiode capacitances up to 100pF when using RF = 1MΩ and CF = 0.5pF, as validated in TI's SBOS291G datasheet Figure 7. At CDIODE = 100pF, the measured −3dB point remains ≥1.05MHz under typical PCB layout conditions with minimized stray capacitance.
Does OPA380AIDR require external components to achieve 0V output swing?
Yes - OPA380AIDR achieves true 0V output swing only when a 2kΩ pulldown resistor (RP) is connected between VOUT (Pin 6) and a −5V supply, as shown in Figure 3 of the SBOS291G datasheet. Without RP, output swing is limited to ≥100mV above V− (ground) under 2kΩ load.
How does the auto-zero architecture of OPA380AIDR affect its noise performance at 10kHz?
At 10kHz, the OPA380AIDR exhibits 67nV/√Hz input voltage noise density - consistent with its high-speed CMOS front-end, not degraded by auto-zero clock feedthrough. TI's characterization confirms negligible energy at the 10kHz correction frequency due to internal filtering; noise remains dominated by broadband thermal sources.
Can OPA380AIDR operate from a 3.3V single supply while maintaining full specified performance?
Yes - OPA380AIDR is fully specified from 2.7V to 5.5V, including all key parameters (25µV VOS max, 50pA IB max, 90MHz GBW, 0.1µV/°C drift) across −40°C to +125°C at 3.3V. Quiescent current is 7.5mA typical, and output swing remains ≥600mV from V+ and ≥100mV from V− under 2kΩ load.
What is the recommended PCB layout practice to minimize noise in OPA380AIDR transimpedance circuits?
TI recommends minimizing stray capacitance at the inverting input (Pin 2) via guard ring routing driven at +IN potential, using short direct traces to the photodiode cathode and feedback resistor, placing 1µF ceramic bypass capacitors within 2mm of Pins 4 (V−) and 5 (V+), and avoiding vias or splits under the MSOP-8 thermal pad to maintain thermal and electrical stability.
OPA380AIDR 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:
- 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-SOIC
OPA380AIDR FAQ
1.How can I place an order for OPA380AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA380AIDR 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 OPA380AIDR reliable?
The price and inventory of OPA380AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA380AIDR is usually 5 days.
3.What payment methods are accepted for OPA380AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA380AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA380AIDR?
OPA380AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA380AIDR 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 OPA380AIDR?
For technical support, including OPA380AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA380AIDR requirements.
6.How does Aetrix verify that OPA380AIDR is sourced from the original manufacturer or authorized distributors?
All OPA380AIDR 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 OPA380AIDR meets industry standards.
7.What is the process for return or replacement of OPA380AIDR?
All OPA380AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA380AIDR, 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 OPA380AIDR part is unused and in its original packaging.
Return procedure for OPA380AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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