Ever Ohms 0603 Package 4.99KΩ Resistance 0.125W Power Rating High Power Thick Film Chip Resistor

CRH0603F4K99P05Z – Ever Ohms 0603 4.99KΩ 0.125W High Power Thick Film Chip Resistor

Part Number Breakdown

CRH0603F4K99P05Z is a standard part number in Ever Ohms Technology's CRH series high power thick film chip resistor line. The code decodes as follows: CRH denotes the high-power thick film chip resistor family; 0603 indicates the EIA 0603 package size; F specifies ±1% tolerance; 4K99 encodes 4.99KΩ (4990Ω) using the three-digit resistance coding convention; P05 refers to power rating and packaging configuration; the trailing Z marks tape-and-reel packaging. This part is in regular mass production and available from standard stock without custom lead time.

Key Electrical Specifications

Rated power is 0.125W at 70°C ambient under continuous full-load operation. Maximum working voltage is 75V, and maximum overload voltage is 150V. The 4.99KΩ value falls within the 10Ω to 1MΩ range, corresponding to a temperature coefficient of ±100 ppm/℃ and F-tier tolerance of ±1%. Operating temperature spans -55°C to +155°C. Above 70°C ambient, power loading must be derated according to the standard derating curve.

Mechanical dimensions measure 1.60±0.1mm in length, 0.80±0.1mm in width, and 0.40±0.10mm in height. Terminal spacing I1 is 0.30±0.20mm and I2 is 0.30±0.10mm. The recommended land pattern follows standard 0603 PCB footprint guidelines: pad length direction A=0.80mm, B=2.40mm; width direction C=1.00mm.

Construction and Process Features

The CRH series uses thick-film printing technology with a ruthenium-based glass glaze resistor paste deposited on a 96% alumina ceramic substrate and fired at high temperature. The terminal structure employs three electrode layers: a bottom silver-palladium alloy layer for ohmic contact with the ceramic body, a middle nickel barrier layer to prevent tin whisker growth and copper ion migration, and an outer tin-coating layer for solderability. This construction withstands 260°C reflow soldering for up to 10 seconds, with resistance change held within ±(0.5%+0.05Ω).

Compared to conventional 0603 resistors rated at 0.1W, the CRH0603 delivers 0.125W in the same footprint — a 25% power density increase. This advantage matters in dense PCB layouts: where board space cannot accommodate a larger package, the CRH series drops in as a direct replacement for standard-size resistors, handling higher dissipation without thermal drift.

Reliability and Environmental Compliance

Ever Ohms CRH series passes the full reliability test suite under JIS-C-5201 and IEC-60115 standards. Damp heat with load testing (40°C, 90–95% RH, 1000 hours on-off cycling) yields resistance change within ±(1.0%+0.05Ω). Load life endurance testing (70°C, 1000 hours powered) shows comparable stability. Rapid temperature change testing (-55°C to +155°C, 5 cycles) confirms resistance stability. Insulation resistance measures ≥10GΩ at 100VDC.

The product is RoHS compliant, lead-free and halogen-free, and meets REACH SVHC restriction requirements. Terminal solder is lead-free, compatible with mainstream lead-free reflow profiles. Recommended storage conditions are 25±5°C at 60±20% relative humidity, with a one-year shelf life from delivery date.

Typical Applications

The 4.99KΩ value is a standard E96 series value. Common circuit uses include: voltage sampling divider networks in power supply circuits (paired with a sense resistor to set a precise divider ratio), pull-up or pull-down resistors in signal conditioning circuits, current-setting resistors in LED driver circuits, and gain-setting resistors at the inverting input of operational amplifiers. The 0.125W power margin is ample for small-signal applications, resisting failure even under supply voltage fluctuations or short-duration overloads.

Application sectors span consumer electronics (motherboards, notebook adapters), home appliances (air conditioner control boards, refrigerator inverter boards), communication equipment (mobile phone charging circuits, fax machine power supplies), power products (switch-mode power supply feedback loops, lighting drivers), and measurement instruments (electric meters, navigation equipment signal chains).

Sourcing and Supply Chain

Shenzhen Shunhai Technology Co., Ltd. is an authorized distributor of Ever Ohms resistors, maintaining stock across the full CRH series lineup. CRH0603F4K99P05Z is available from stock, with sample requests and small-batch trial orders supported. Shunhai Technology provides original Ever Ohms datasheets, COC certificates, and batch traceability reports, with stable lead times of 2–4 weeks for volume orders.

The Huanian Mall online platform also carries this part, supporting direct online ordering and VAT special invoice issuance — well suited for R&D prototyping and mid-volume replenishment. Both channels guarantee original factory quality, with distributor-backed return and replacement responsibility for quality issues within datasheet specifications.

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