MCR03EZPFX4990 ROHM Semiconductor Resistor (Resistor Chip) In Stock
ROHM MCR03EZPFX4990 is a 499Ω, ±1% tolerance, 0.1W thick-film chip resistor in an 0603 (1.6mm x 0.8mm) surface-mount package with ±100 ppm/°C temperature coefficient, offering stable precision resistance for signal conditioning, voltage dividing, and filtering in compact electronic assemblies.
- Manufacturer
- ROHM Semiconductor
- Package
- Resistor Chip
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- MCR03EZPFX4990 Datasheet PDF
- Category
- Resistor
- Temp Range
- -55.0°C to 155.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 499Ω ±1% tolerance provides precision resistance matching for voltage dividers, feedback networks, and current-sense circuits
- ±100 ppm/°C temperature coefficient ensures resistance stability across a wide operating temperature range in industrial and automotive environments
- 0603 (1.6mm x 0.8mm x 0.45mm) chip package minimizes PCB footprint while supporting automated high-speed SMT pick-and-place assembly
- RoHS-compliant lead-free (e3) construction meets REACH and global environmental regulatory requirements for worldwide deployment
Applications
The ROHM MCR03EZPFX4990 is widely used in precision voltage divider networks, op-amp feedback resistors, and current-limiting circuits in smartphones, IoT sensors, and industrial control modules where accurate 499Ω resistance is required. Its ±1% tolerance and ±100 ppm/°C temperature coefficient make it suitable for signal conditioning stages in analog-to-digital converter (ADC) front ends and sensor interface circuits where resistance drift directly affects measurement accuracy. The compact 0603 package integrates seamlessly into high-density PCB layouts found in wearables, medical devices, and consumer electronics.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| YTEOL | 9 |
| Construction | Rectangular |
| JESD-609 Code | e3 |
| Mounting Feature | SURFACE MOUNT |
| Package Height | 0.45mm |
| Package Length | 1.6mm |
| Package Shape | RECTANGULAR PACKAGE |
| Package Style | SMT |
| Package Width | 0.8mm |
| Packing Method | TR, Paper, 7 Inch |
| Rated Power Dissipation (P) | 0.1W |
| Rated Temperature | 70°C |
| Resistance | 499Ω |
| Resistor Type | FIXED RESISTOR |
| Size Code | 0603 |
| Surface Mount | YES |
| Technology | METAL GLAZE/THICK FILM |
| Temperature Coefficient | 100ppm/°C |
| Terminal Finish | Tin (Sn) - with Nickel (Ni) barrier |
| Terminal Shape | WRAPAROUND |
| Tolerance | 1% |
| Working Voltage | 50V |
| Package | Resistor Chip |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8533.21.00.30 |
| Country of Origin | Philippines, Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the ±1% tolerance of MCR03EZPFX4990 affect precision voltage divider accuracy across temperature?
At ±1% tolerance, the MCR03EZPFX4990 introduces a worst-case initial resistance error of ±4.99Ω on its 499Ω nominal value. Combined with the ±100 ppm/°C temperature coefficient, a 50°C temperature rise adds a further ±0.5% resistance change (±2.5Ω), giving a total worst-case error of about ±1.5% over the operating range. For a 3.3V to 1.8V voltage divider used as an ADC reference, this translates to a maximum output voltage error of approximately ±24 mV, which is acceptable for 8-bit to 10-bit ADC applications but may require calibration for 12-bit or higher precision systems.
In an 0603 SMT layout, how does the MCR03EZPFX4990 footprint compare to 0402 alternatives for a space-constrained IoT board?
The MCR03EZPFX4990 uses the 0603 package measuring 1.6mm x 0.8mm x 0.45mm, which has a pad footprint roughly 2.5 times larger than the 0402 (1.0mm x 0.5mm) package. While the 0402 saves space, the 0603 is generally easier to hand-solder during prototype stages and less prone to tombstoning defects on automated reflow lines, making it a better choice when the PCB has sufficient room and manufacturing yield is prioritized over absolute miniaturization.
For a current-sense application in an industrial motor controller, does the 0.1W power rating of MCR03EZPFX4990 set practical current limits?
Yes — the 0.1W power rating of the MCR03EZPFX4990 limits the maximum continuous current through the 499Ω resistor to approximately 14.2 mA (I = √(P/R) = √(0.1/499) ≈ 0.0142A) before the resistor exceeds its rated dissipation. For motor controller current sensing at higher currents of 1A or more, a lower-value current-sense resistor (typically 0.01Ω to 0.1Ω) rated at 0.5W to 2W would be more appropriate, with the MCR03EZPFX4990 better suited as a signal-path resistor in the amplifier feedback network rather than in the high-current path.
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