HR0805F-33G5I WELWYN Resistor (Resistor Chip) In Stock
Welwyn HR0805F-33G5I is a high-resistance thick-film chip resistor in the 0805 package with a resistance value in the gigaohm range, ±1% tolerance, designed for precision high-impedance measurement and leakage current sensing in industrial, medical, and test-and-measurement applications.
- Manufacturer
- WELWYN
- Package
- Resistor Chip
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- HR0805F-33G5I Datasheet PDF
- Category
- Resistor
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- High resistance value in the gigaohm (GΩ) range enabling ultra-high-impedance circuit design
- 0805 (2012 metric) chip package for standard SMT placement on 2.0 mm × 1.25 mm footprint
- ±1% tolerance (F grade) for precision high-impedance voltage dividers and leakage detection circuits
- Thick-film resistive element optimized for stable performance at low current levels in the nanoamp range
- Welwyn/TT Electronics HR series rated for -55°C to +155°C operating temperature range
Applications
The HR0805F-33G5I is used in high-impedance measurement circuits such as electrometer front-ends, ionization chamber amplifiers, and insulation resistance test instruments where gigaohm-range resistors must be stable and precise. It is also found in medical equipment and industrial sensors requiring nanoamp-level current measurement or ultra-low leakage bias networks.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for HR0805F-33G5I:
Frequently Asked Questions
What is the resistance value and tolerance of HR0805F-33G5I, and how does this affect precision high-impedance circuit design?
HR0805F-33G5I is a 33 GΩ resistor with ±1% tolerance, which corresponds to a resistance spread of ±330 MΩ. In high-impedance amplifier feedback networks or electrometer circuits, this level of tolerance ensures that the input bias current error contribution remains predictable and that two matched resistors will differ by no more than 660 MΩ, making it suitable for precision leakage current sensing applications.
Why choose the 0805 chip package for a 33 GΩ resistor, and what PCB layout precautions are necessary?
The 0805 (2.0 mm × 1.25 mm) package balances physical handling ease and PCB footprint for gigaohm-range resistors. At 33 GΩ, even a few nanoamps of surface leakage across the PCB can create a parallel resistance path; designers should use guard rings of clean FR4 copper around the component pads, apply PCB surface coating, and minimize pad contamination to keep the effective parallel leakage resistance above 100 GΩ.
In what industries is HR0805F-33G5I typically specified, and what qualification standards apply to it?
HR0805F-33G5I is typically specified in medical diagnostics equipment, nuclear radiation detection (ionization chambers), industrial insulation testers, and scientific instrumentation where resistances above 1 GΩ are needed. Welwyn's HR series components comply with AEC-Q200-qualified thick-film resistor standards and are manufactured to MIL-PRF-55342-equivalent reliability levels, making them acceptable for safety-critical and high-reliability design environments operating from -55°C to +155°C.
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