OPA381AIDRBTG4 Texas Instruments Integrated Circuit (Small Outline No-lead) In Stock
Texas Instruments OPA381AIDRBTG4 is a precision, low-power, high-speed transimpedance amplifier optimized for photodiode current-to-voltage conversion in optical sensing applications. It features wide bandwidth and low input bias current enabling accurate detection of small photocurrents. Suited for optical proximity sensors, pulse oximeters, barcode scanners, and industrial light measurement systems requiring fast and precise analog signal processing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline No-lead
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- OPA381AIDRBTG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of OPA381AIDRBTG4?
- High-speed transimpedance amplifier with bandwidth up to 10 MHz for fast optical signal detection
- Ultra-low input bias current below 1 pA minimizing dark current measurement errors
- Single-supply operation from 2.7 V to 5.5 V for 3.3 V and 5 V optical front ends
- Precision offset voltage below 500 µV for accurate low-light photocurrent measurement
- 8-pin SON package with exposed thermal pad for compact PCB integration
- Low quiescent current enabling battery-powered portable optical sensor designs
- RoHS-compliant G4 green packaging for global regulatory compliance
What is OPA381AIDRBTG4 used for?
The OPA381AIDRBTG4 is designed for photodiode transimpedance amplifier (TIA) circuits in optical sensing applications including pulse oximeters, barcode readers, industrial light curtains, and proximity detectors. Its high bandwidth and sub-picoamp input bias current enable accurate conversion of small photocurrents generated by PIN photodiodes and avalanche photodetectors over a wide dynamic range. The compact 8-pin SON package and single-supply operation simplify integration into portable medical instruments, consumer electronics, and industrial safety equipment.
What are the specifications of OPA381AIDRBTG4?
| YTEOL | 0 |
| JESD-30 Code | S-PDSO-N8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOLCC8,.12,25 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 0.0011mA |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Telecom IC Type | TELECOM CIRCUIT |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline No-lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| HTS Code | 8542.39.00.01 |
Where can I find the OPA381AIDRBTG4 datasheet?
OPA381AIDRBTG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for OPA381AIDRBTG4?
Compatible alternatives and drop-in replacements for OPA381AIDRBTG4:
Frequently Asked Questions
What bandwidth does the OPA381AIDRBTG4 support in a transimpedance amplifier configuration with a 1 MOhm feedback resistor?
The OPA381AIDRBTG4 achieves a transimpedance bandwidth of up to approximately 10 MHz with a 1 MOhm feedback resistor and a small feedback capacitor to stabilize phase margin. This bandwidth supports optical pulse detection at rates above 1 MHz, making it suitable for barcode scanner front ends, laser rangefinder receivers, and high-speed proximity sensors operating at 3.3 V or 5 V supply.
How does the OPA381AIDRBTG4 minimize measurement errors when amplifying small photodiode currents in low-light conditions?
The OPA381AIDRBTG4 has an input bias current below 1 pA, which introduces less than 1 mV of offset error even with a 1 MOhm transimpedance feedback resistor. Combined with an input offset voltage below 500 µV, total DC error stays below 1.5 mV referred to output, enabling accurate detection of photocurrents as small as 1 nA in low-light optical measurement applications.
For a wearable pulse oximeter design, why is the OPA381AIDRBTG4 in SON-8 packaging advantageous compared to a larger SOIC package?
The OPA381AIDRBTG4 in SON-8 package occupies approximately 3 mm x 3 mm of PCB area, roughly 60% less than a standard SOIC-8 footprint of 5 mm x 4 mm. The exposed thermal pad improves heat dissipation, and the 2.7 V minimum supply allows direct operation from a single 3.3 V LDO in wearable pulse oximeters where board area and battery capacity are tightly constrained.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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