WCR1206-R005JI WELWYN Resistor (Resistor Chip) In Stock
WELWYN WCR1206-R005JI is a thick film chip resistor in 1206 package with 0.005 Ω resistance, ±5% tolerance, and 0.25 W power rating. Designed as a current sensing shunt in surface mount form. Available from stock with worldwide shipping.
- Manufacturer
- WELWYN
- Package
- Resistor Chip
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- WCR1206-R005JI Datasheet PDF
- Category
- Resistor
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultra-low 0.005 Ω resistance for precision current sensing and shunt measurement
- 0.25 W power rating in standard 1206 (3.2 mm × 1.6 mm) SMT package
- ±5% tolerance maintains consistent shunt accuracy across production batches
- Thick film construction provides robust electrical and mechanical performance
- 1206 footprint compatible with automated SMT pick-and-place assembly
Applications
The WCR1206-R005JI is used as a current sensing shunt resistor in motor drive circuits, battery management systems, and DC-DC converter feedback loops requiring accurate low-side current measurement. Its 0.005 Ω resistance minimizes voltage burden on the measured circuit while allowing easy current calculation from the 1206-size SMT footprint. This thick film resistor is also used in overcurrent protection circuits and power metering applications where compact, reliable shunts are essential.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How is the WCR1206-R005JI used as a current sensing element in power electronics designs?
The WCR1206-R005JI has a 0.005 Ω resistance value that produces a measurable voltage drop proportional to current flow; at 5 A, it generates 25 mV across its terminals. This small, predictable voltage is amplified by a current sense amplifier for feedback in motor controllers, battery chargers, and DC-DC converters.
What power dissipation limits must be observed when using the WCR1206-R005JI in high-current circuits?
The WCR1206-R005JI is rated for 0.25 W continuous power dissipation in the 1206 SMT package. At 0.005 Ω, this corresponds to a maximum continuous current of approximately 7.1 A (P = I² × R), so designers must derate current below this limit in applications with elevated ambient temperatures or reduced airflow.
Why choose a 0.005 Ω shunt resistor like WCR1206-R005JI over higher-value current sensing resistors?
A 0.005 Ω shunt such as the WCR1206-R005JI introduces minimal voltage burden of only 5 mV per amp of current, preserving power efficiency in high-current paths of 5 A to 10 A. Higher-resistance shunts would dissipate more power and reduce the voltage available to the load, making low-value shunts preferable for efficient motor drives and battery systems.
What tolerance and package specifications should procurement teams verify when ordering WCR1206-R005JI substitutes?
When sourcing alternatives to the WCR1206-R005JI, procurement teams should verify 0.005 Ω resistance, ±5% tolerance, 0.25 W power rating, and a standard 1206 chip resistor package (3.2 mm × 1.6 mm footprint). Thick film construction ensures consistent resistance characteristics, and verifying these 4 parameters confirms functional and mechanical interchangeability.
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About WELWYN
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