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HomeProductsResistorsThrough Hole ResistorsRCMA0251100FEA20
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RCMA0251100FEA20 - Vishay Sfernice

Manufacturer Part Number
RCMA0251100FEA20
Manufacturer
MCB Industrie/Vishay
Allelco Part Number
98D-RCMA0251100FEA20
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
31,805 pcs available, New & Original
Parts Description
SFERNICE FIXED RESISTORS
Package
Tape & Box (TB)
Data sheet
RCMA0251100FEA2.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 31805
  • Unit Price: $17.434
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $17.434 $17.43
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

RCMA0251100FEA20 Tech Specifications
Vishay Sfernice - RCMA0251100FEA20 technical specifications, attributes, parameters and parts with similar specifications to Vishay Sfernice - RCMA0251100FEA20

Product Attribute Attribute Value
Manufacturer MCB Industrie/Vishay
Series *
Product Attribute Attribute Value
Package Tape & Box (TB)

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) Not Applicable
ECCN EAR99
HTSUS 8533.21.0090

Frequently Asked Questions(FAQ)

What thermal management considerations apply when using the RCMA0251100FEA20 in high-frequency switching circuits?
The RCMA0251100FEA20 is a through-hole resistor that dissipates heat through lead conduction and surface radiation. In switching applications where duty cycles exceed 50%, thermal coupling to the PCB becomes critical. The resistor's through-hole mounting allows direct thermal transfer to copper planes beneath the component body. For the RCMA0251100FEA20, designers should calculate steady-state power dissipation and verify that ambient temperature plus self-heating does not exceed the rated operating range. Proximity to heat-sensitive components necessitates either thermal isolation or active cooling provisions when the RCMA0251100FEA20 operates near power conversion stages.
How does the RCMA0251100FEA20 compare to thin-film surface-mount resistors in terms of tolerance stability over temperature cycling?
The RCMA0251100FEA20, as a through-hole component, typically exhibits ±1% or better tolerance with temperature coefficients in the ±100–200 ppm/°C range depending on film composition. Thin-film SMD resistors often achieve ±0.1% initial tolerance with tighter temperature coefficients (±25–50 ppm/°C), but the RCMA0251100FEA20 provides superior mechanical stability during thermal cycling because the leads absorb mechanical stress rather than transmitting it to the solder joint. In applications experiencing repeated thermal stress (automotive, industrial), the RCMA0251100FEA20 typically shows less drift over extended cycling than comparably priced thin-film alternatives.
What precautions should be taken when soldering the RCMA0251100FEA20 in wave-soldering processes?
The RCMA0251100FEA20 is rated for wave-soldering processes with specific thermal profiles. Lead-free solder requires peak temperatures of 250–260°C, while the RCMA0251100FEA20's epoxy body is typically rated to withstand 260°C for up to 10 seconds. Excess dwell time causes the epoxy to soften, potentially compromising the seal and allowing moisture ingress. When the RCMA0251100FEA20 is positioned perpendicular to the solder wave direction, preheating to 150–180°C for 60–120 seconds reduces thermal shock. Post-soldering cleanliness is essential; ionic contamination can accelerate degradation paths in the RCMA0251100FEA20's epoxy coating.
Why might the RCMA0251100FEA20 show resistance drift in humid environments despite RoHS3 compliance?
RoHS3 compliance in the RCMA0251100FEA20 addresses hazardous substance restriction but does not guarantee moisture impermeability. The epoxy coating on the RCMA0251100FEA20 can absorb moisture when exposed to >85% relative humidity, causing ionic paths to form within the film layer. This results in leakage currents and effective resistance reduction, particularly when the RCMA0251100FEA20 operates at elevated bias voltages (>50V). High-humidity applications demand conformal coating, potting, or encapsulation of circuits containing the RCMA0251100FEA20. The MSL classification does not apply to through-hole components, but moisture ingress into the epoxy bulk is a real failure mechanism if the RCMA0251100FEA20 is stored in uncontrolled environments prior to assembly.
How does the RCMA0251100FEA20 perform in precision signal conditioning applications compared to wirewound alternatives?
The RCMA0251100FEA20 uses thin-film or thick-film deposition, which provides superior frequency response and lower parasitic inductance compared to wirewound designs. Wirewound resistors exhibit inductive reactance at frequencies above 10 kHz, degrading performance of the RCMA0251100FEA20's signal path in audio, instrumentation, and RF applications. The RCMA0251100FEA20 maintains stable impedance up to several megahertz, making it suitable for precision analog filtering and impedance matching. However, wirewound resistors excel in high-power, low-noise applications; the RCMA0251100FEA20 is selected when frequency stability, tolerance, and compact form factor outweigh power-handling requirements.
What is the maximum safe pulse power rating for the RCMA0251100FEA20, and how does it differ from continuous power dissipation?
The RCMA0251100FEA20 datasheets typically specify continuous power ratings (e.g., 0.25W or 0.5W) and peak pulse ratings, often 2–3 times higher for short durations (<1 second). Peak pulse power for the RCMA0251100FEA20 may reach 1–1.5W depending on the time constant and duty cycle. However, sustained pulse repetition at the peak rating causes cumulative thermal stress on the epoxy substrate and film interface, reducing the effective lifetime of the RCMA0251100FEA20. Design calculations must account for average dissipation over the repetition period; a 1.5W pulse repeated every 10 milliseconds at 10% duty cycle results in average dissipation of 0.15W, leaving significant margin. The RCMA0251100FEA20 should not be selected based solely on peak ratings without confirming long-term reliability under the intended duty cycle.
Can the RCMA0251100FEA20 be used in active current-limiting circuits, and what are the failure modes?
The RCMA0251100FEA20 can serve as a current-limiting element in active circuits, but the design must account for transient overstress. When the RCMA0251100FEA20 is placed in series with a load that experiences sudden short circuits, the resistor must dissipate the full fault current within milliseconds. If the RCMA0251100FEA20 is undersized, thermal runaway occurs: localized overheating in the film layer causes rapid resistance increase, which concentrates heat further, leading to epoxy degradation and open-circuit failure. The RCMA0251100FEA20 used in current-limiting applications must include upstream fusing or parallel protection to prevent this failure mode. Repeated overstress events degrade the RCMA0251100FEA20 even if it survives the first transient.
How does RCMA0251100FEA20 long-term stability compare over a 10-year service life in industrial environments?
The RCMA0251100FEA20 exhibits cumulative drift from three mechanisms: thermal cycling stress on the film-substrate interface, moisture-induced leakage path formation, and oxidation of metallic contacts. In controlled environments (20–50°C, <70% RH), the RCMA0251100FEA20 typically drifts <5% over 10 years. Industrial environments with thermal cycling (−20°C to +80°C), humidity cycling, and mechanical vibration accelerate drift to 8–15% by year 10. The RCMA0251100FEA20 used in precision applications (reference dividers, calibration networks) should be selected with initial tolerance better than required by the system specification to maintain performance at end-of-life. Periodic recalibration or active compensation circuits mitigate long-term drift in the RCMA0251100FEA20 performance.
What is the lead solderability specification for the RCMA0251100FEA20, and how does it affect rework processes?
The RCMA0251100FEA20 leads are typically plated with tin or nickel-plated copper to facilitate solder adhesion. After manufacturing, the RCMA0251100FEA20 remains solderable for 6–12 months under normal storage conditions; extended storage in warm or humid environments reduces the window. During rework, the RCMA0251100FEA20 leads must be heated above the solder melting point (217°C for lead-free) to reflow the existing solder joint. Aggressive mechanical removal of the RCMA0251100FEA20 can damage the plating, rendering the leads non-solderable. If the RCMA0251100FEA20 must be reworked multiple times, application of fresh solder or lead-tin flux improves wetting. Failed or marginal solder joints on the RCMA0251100FEA20 should be addressed immediately; thermal cycling after a weak initial joint accelerates cracking and intermittent open-circuit failures.
Does the RCMA0251100FEA20 require derating for operation above 70°C, and what is the practical temperature limit?
The RCMA0251100FEA20 typically operates to 155–175°C (depending on film composition), but power handling must be derated above 70°C. Most datasheets specify 50% power derating by 155°C, meaning the RCMA0251100FEA20 rated for 0.25W at 70°C can safely dissipate only 0.125W at 155°C. At operating temperatures above 125°C, the RCMA0251100FEA20's film resistance increases, thermal stability becomes marginal, and the epoxy begins to approach its glass transition temperature. Applications using the RCMA0251100FEA20 in high-temperature environments (automotive under-hood, industrial furnaces) must select higher power ratings or employ thermal management. The RCMA0251100FEA20 is not suitable for continuous operation above 150°C without explicit manufacturer derating curves.
What noise characteristics should be expected from the RCMA0251100FEA20 in low-level signal applications?
The RCMA0251100FEA20 exhibits thermal noise proportional to operating temperature and resistance value (Johnson noise: V = √(4kTR·Δf)). At room temperature and 1 MΩ resistance, the RCMA0251100FEA20 generates approximately 129 nV/√Hz. Film resistors like the RCMA0251100FEA20 also exhibit 1/f (flicker) noise at frequencies below 100 Hz, which can limit performance in precision instrumentation. The RCMA0251100FEA20 used in transimpedance amplifier feedback networks or precision analog-to-digital converter input impedance matching should be specified with the lowest practical resistance value (subject to power dissipation constraints) to minimize noise contribution. Conformal coating or potting does not reduce electrical noise from the RCMA0251100FEA20 but can improve noise stability by reducing moisture-induced leakage.
How should the RCMA0251100FEA20 be selected for applications requiring ESD tolerance?
The RCMA0251100FEA20 itself has limited ESD withstand capability; the epoxy substrate can be damaged by electrostatic discharge events exceeding 2–4 kV (contact discharge). The RCMA0251100FEA20 should be deployed downstream of ESD protection devices (suppressors, transil diodes) rather than in the primary discharge path. When the RCMA0251100FEA20 is used in precision input networks (instrumentation, sensor interfaces), series-limiting resistors ahead of the RCMA0251100FEA20 reduce ESD current density. The RCMA0251100FEA20 can be considered part of the ESD filtering network if properly coordinated with clamp devices, but the RCMA0251100FEA20 itself should not be relied upon as the primary ESD protection element. Board-level ESD handling practices (grounding, controlled assembly environment) protect the RCMA0251100FEA20 during manufacturing and integration.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay Sfernice RCMA0251100FEA20

Product Attribute RCMA0251101FDA20 RCMA0251100FES03 RCMA0250R00BEA20 RCMA0251101FES03
Part Number RCMA0251101FDA20 RCMA0251100FES03 RCMA0250R00BEA20 RCMA0251101FES03
Manufacturer Vishay Sfernice Vishay Sfernice Vishay Sfernice Vishay Sfernice
Series - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

RCMA0251100FEA20 Datasheet PDF

Download RCMA0251100FEA20 pdf datasheets and Vishay Sfernice documentation for RCMA0251100FEA20 - Vishay Sfernice.

PCN Packaging
Multiple Series Packaging Change 10/Jun/2020.pdf Multiple Series Packaging 10/Jun/2020.pdf

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1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
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RCMA0251100FEA20 Image

RCMA0251100FEA20

Vishay Sfernice
98D-RCMA0251100FEA20

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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