CRH2512F249RE04Z 2512 249Ω 2W High Power Thick Film Chip Resistor with ±1% Tolerance
249 Ω High Power Thick Film Chip Resistor
,2W Rated Power 2512 Chip Resistor
,±1% Tolerance CRH Series Resistor
CRH2512F249RE04Z is a standard part number for Ever Ohms Electronics' thick-film high-power chip resistor series. Each field is interpreted as follows:
| Field | Meaning |
|---|---|
| CRH | Thick Film High Power Chip Resistor Series |
| 2512 | Imperial package size, metric equivalent 6332 (6.40 mm * 3.20 mm) |
| F | Resistance tolerance ±1% |
| 249R | Nominal resistance 249 Ω; "R" denotes the decimal point |
| E04 | Standard tape-and-reel packaging code |
| Z | Lead-free (Pb-Free) and RoHS compliant |
This part targets industrial high-power-density applications, delivering 2 W rated power within a 2512 footprint—approximately 60% to 100% higher than conventional thick-film resistors of the same size. It suits circuit designs where board space is limited and thermal load is significant.
| Parameter | Specification | Notes |
|---|---|---|
| Nominal Resistance | 249 Ω | Tolerance ±1% |
| Rated Power | 2 W | At 70 °C ambient |
| Limiting Element Voltage | 200 V | Or √P*R, whichever is lower |
| Overload Voltage | 400 V | Short duration 5 s |
| Temperature Coefficient (TCR) | ±100 ppm/°C | Typical; refer to datasheet for lot-specific values |
| Operating Temperature | −55 °C to +155 °C | Power derating curve applies above 70 °C |
| Package Dimensions | 6.40 mm * 3.20 mm * 0.55 mm | Standard 2512 thickness |
| Termination | Lead-free tin over nickel (Sn over Ni) | RoHS/REACH compliant |
249 Ω is a standard value in both E24 and E96 series. The ±1% precision supports current sensing, voltage division, and impedance-matching nodes that demand high consistency.
Conventional 2512 thick-film chip resistors typically offer 1 W or 1.5 W. The CRH series achieves 2 W by optimizing the ceramic substrate heat-conduction path, enlarging the back-side electrode area, and refining the resistive paste formulation. Designers can eliminate parallel devices or downsize packages for equivalent power handling.
With an operating span of −55 °C to +155 °C and TCR around ±100 ppm/°C, the 249 Ω resistance remains stable under industrial temperature swings. For precision current-sense circuits, this characteristic directly determines long-term sampling accuracy.
The resistive element is encapsulated with glass passivation, providing excellent moisture resistance and pulse-load capability. Under transient conditions such as switching-supply inrush or motor-drive back-EMF, CRH2512F249RE04Z outperforms general-purpose commercial-grade chip resistors.
The lead-free tin-over-nickel plating is compatible with both Sn-Pb and lead-free reflow profiles. Solderability is maintained after three reflow passes at a peak temperature of 260 °C, reducing process-switching costs in mixed-line production.
In primary- or secondary-side current-detection loops of AC-DC and DC-DC converters, a 249 Ω sense resistor pairs with an operational amplifier in a differential configuration. The 2 W rating accommodates continuous sense currents in the 50 mA–90 mA range, while the 2512 package area facilitates Kelvin connections in compact power modules.
High-power LED driver ICs often use an external precision resistor to ground for current programming. A 249 Ω resistor combined with the internal reference sets drive currents in the hundred-milliamp range. The CRH series' high-temperature stability mitigates lumen-depreciation drift after prolonged LED operation.
Bus-voltage dividers and IGBT gate-drive bias networks in inverters require resistors that tolerate high pulse voltages. CRH2512F249RE04Z, with its 200 V limiting voltage and thick-film structure, serves as an auxiliary voltage-divider element in 380 V-class industrial drive systems.
Battery-management-system balancing resistors and auxiliary sensing networks in photovoltaic inverters must operate continuously inside high-temperature enclosures. The power and temperature margins of the 2512 249R 2W resistor align with the thermal design requirements of outdoor sealed cabinets.
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Power Derating: Above 70 °C ambient, reduce power linearly per the datasheet derating curve. Steady-state dissipation should not exceed 60%–70% of the rated power to maximize service life.
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Voltage Verification: Even if power is within limits, the continuous terminal voltage must not exceed 200 V. For high-voltage dividers, calculate the voltage drop across each resistor.
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Thermal Management: Although the 2512 package supports 2 W, augment copper area or add thermal vias when foil area is insufficient. Parallel operation is an alternative to reduce individual temperature rise.
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Precision Matching: For high-accuracy current sensing, procure from the same production lot and budget ±0.5% for TCR variation to prevent system offset caused by batch-to-batch differences.
Ever Ohms Electronics thick-film high-power chip resistors are widely distributed in the Chinese market. Purchasing through authorized distributors or reputable component platforms ensures genuine parts and complete technical support.
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Shenzhen Shunhai Technology Co., Ltd. (深圳市顺海科技有限公司): A specialized passive-component distributor with years of experience. Shunhai maintains ready stock across the full CRH series resistance range, offers datasheets, RoHS reports, and small-quantity sample support. Flexible lead times suit both R&D prototyping and volume procurement.
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HuaNian Mall (华年商城): A leading domestic electronic-component spot-trading platform. HuaNian provides comprehensive coverage of Ever Ohms Electronics resistor models with real-time online inventory, pricing, and delivery queries. The streamlined ordering process meets the quick replenishment and BOM Ever Ohms needs of small and medium enterprises.
Procuring CRH2512F249RE04Z through these channels effectively eliminates the risks of refurbished or remarked parts, safeguarding the long-term reliability of 2512 249R 2W resistors in industrial products.
