POPA145IDBVR Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
The POPA145IDBVR is a single-channel JFET-input operational amplifier from Texas Instruments in a compact 5-pin SOT-23 package. It features very low input bias current typical of JFET architectures, suitable for high-impedance sensor interfaces operating at low supply voltages. The tiny SOT-23-5 form factor supports space-constrained portable and wearable analog front-end designs.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- POPA145IDBVR Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of POPA145IDBVR?
- JFET input stage delivers picoampere-level bias current for minimal loading on high-impedance signal sources such as piezo sensors and photodiodes
- Single-channel op-amp in a 5-pin SOT-23 package occupies under 3 mm² board area for ultra-compact portable instrument layouts
- Low-voltage operation compatible with 3.3 V and 5 V single-supply rails supporting modern battery-powered sensing applications
What is POPA145IDBVR used for?
The POPA145IDBVR fits portable medical devices and wearable biosensors where JFET input characteristics minimize bias-current-induced offset errors on high-impedance electrode interfaces. It is used in handheld gas analyzers, pH meters, and optical sensor front-ends where the 5-pin SOT-23 package reduces board space by over 50% compared to 8-pin SOIC amplifiers. The device also applies to low-power audio and vibration sensing circuits needing a single amplifier stage with minimal quiescent current draw at 3.3 V or 5 V supply rails.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the POPA145IDBVR datasheet?
POPA145IDBVR Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for POPA145IDBVR?
Compatible alternatives and drop-in replacements for POPA145IDBVR:
Frequently Asked Questions
Why is a JFET-input op-amp like POPA145IDBVR preferred for piezoelectric sensor interfaces?
JFET-input amplifiers maintain input bias currents in the picoampere range, typically 1 pA to 50 pA, which is orders of magnitude lower than BJT-input alternatives. For a piezoelectric sensor with an equivalent impedance of 10 MΩ or more, even 10 pA of bias current creates only 0.1 mV offset error, preserving signal accuracy without requiring large coupling capacitors or bias compensation networks.
What board space does the 5-pin SOT-23 package of the POPA145IDBVR occupy compared to a standard 8-pin SOIC?
The SOT-23-5 package measures approximately 1.6 mm × 2.9 mm, occupying roughly 4.6 mm² of board area. A standard 8-pin SOIC package occupies about 19 mm², so the POPA145IDBVR saves more than 75% of the PCB footprint. This size advantage is decisive in wearable devices and hearing aids where every square millimeter of board space carries a premium.
At what supply voltage range does the POPA145IDBVR operate for single-supply portable designs?
The POPA145IDBVR is designed for low-voltage single-supply operation compatible with 3.3 V and 5 V rails commonly found in microcontroller-based portable systems. This supply range aligns with lithium-ion battery outputs between 3 V and 4.2 V, making the device suitable for single-cell battery-powered wearable sensors and IoT analog front-ends.
How does the POPA145IDBVR compare to a BJT-input single op-amp in a 5-pin SOT-23 for a pH meter front-end?
A pH electrode typically presents an impedance of 100 MΩ to 1 GΩ, where a BJT op-amp with 50 nA bias current would introduce 5 V to 50 V of offset error — completely unusable. The POPA145IDBVR's JFET input, with sub-50 pA bias current, limits this error to under 50 mV even at 1 GΩ source impedance, making it the correct choice for accurate 0 pH to 14 pH measurement without external guarding circuits.
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Why Buy from FindMyChip
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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