CMF556M8100FKEA - 6.81MΩ ±1% 0.5W Metal Film Resistor | Vishay Dale
N.º de pieza: CMF556M8100FKEA ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.66 | $0,66 |
| 10 | $0.59 | $5,90 |
| 100 | $0.53 | $53,00 |
| 500 | $0.48 | $240,00 |
| 1.000 | $0.42 | $420,00 |
CMF556M8100FKEA Descripción general
Background: A metal film resistor is a passive component whose resistive element is a thin vacuum-deposited metal alloy film on a ceramic substrate, laser- or helix-trimmed to a precise value. Compared to carbon-film or wirewound predecessors, metal film resistors deliver superior tolerance (often ±1% or better), low temperature coefficient, and excellent long-term stability, making them the default choice for precision analog, measurement, and signal-conditioning circuits.
Key features: 6.81 MΩ resistance, ±1% tolerance (F tolerance letter), ±100 ppm/°C TCR, 0.5W rated power at 70°C derated linearly to 0W at +175°C, 250V maximum working voltage, axial leaded package, flame-retardant epoxy coating, moisture-resistant construction, and the CMF-55 industrial-series safety designation. The "E" in the part number indicates lead-free (e3) construction with Pb-free terminations compatible with modern lead-free soldering processes.
Typical applications for a 6.81 MΩ high-value resistor include precision voltage dividers in high-impedance instrumentation amplifiers, electrostatic-discharge (ESD) input bleed networks on measurement ports, high-voltage sensing probes, medical electrophysiology signal-acquisition front-ends, and as the feedback or reference-setting element in low-current bias networks. The combination of tight tolerance and stable TCR enables repeatable performance in calibrated measurement chains.
Design consideration: For voltages approaching the 250V working limit, derate the applied voltage by √(P×R) and verify creepage/clearance distances on the PCB. At 6.81 MΩ, even small leakage on the PCB surface can introduce measurement error—use guard rings, PTFE standoffs, or conformal coating for sensitive high-impedance nodes.
This page synthesizes distributor pricing, drop-in same-package alternatives, and PCB-layout notes not found in the bare manufacturer datasheet, helping procurement and design engineers select and source the CMF556M8100FKEA with full visibility into pricing, availability, and engineering trade-offs.
Alternativas directas para CMF556M8100FKEA — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
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CMF556M8100FKEB
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CMF556M8100FKEK
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CMF556M8100FKE
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MFR-25FBF52-6M81
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EBW6M81J0
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CMF556M8100FKEA Valores máximos y características eléctricas
| Resistance | 6.81 MΩ (6,810,000 Ω) |
| Tolerance | ±1% |
| Power Rating | 0.5 W (1/2 W) |
| Composition | Metal Film |
| Temperature Coefficient | ±100 ppm/°C |
| Temperatura de funcionamiento | -55°C to +175°C |
| Maximum Working Voltage | 250 V |
| Encapsulado / Carcasa | Axial (CMF-55) |
| Tipo de montaje | Through Hole |
| Series | CMF Industrial |
| Características | Flame Retardant Coating, Moisture Resistant, Safety |
| Termination Style | Axial Leaded |
| Supplier Device Package | Axial |
| Packaging | Tape & Reel (T-1 / EA e3) |
| Lead-Free / RoHS | Yes (e3 designation) |
Guía de configuración de pines de CMF556M8100FKEA axial
Configuración de pines para CMF556M8100FKEA (encapsulado axial). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para CMF556M8100FKEA.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
CMF556M8100FKEA es adecuado para 6 aplicacións: High-Impedance Instrumentation Amplifier Input Network, High-Voltage Measurement Probe Bleed Network, Electrostatic Discharge (ESD) Bleed Resistor for Measurement Inputs, Precision Voltage Divider Reference Network, Medical and Scientific Instrumentation Front-End, Industrial Process Control Loop Interface.
High-Impedance Instrumentation Amplifier Input Network
The CMF556M8100FKEA suits precision instrumentation-amp input bias networks where FET-input op-amps draw picoampere-level bias current and a 6.81 MΩ feedback or input resistor defines overall gain and input impedance. Its ±1% tolerance and ±100 ppm/°C TCR ensure that gain error stays below 0.1% across the -55°C to +175°C operating range, while the 0.5W power rating provides ample margin over the dissipation levels seen at typical ±15V supplies (P = V²/R ≈ 33 µW per resistor). Use the CMF556M8100FKEA on the input side of INA128, AD620, or LT1010-style front-ends where leakage and accuracy dominate the error budget. For matched-pair layouts, Vishay CMF-55 series parts offer consistent hot-spot behavior, simplifying PCB thermal balancing across the differential pair.
Recomendado
High-Voltage Measurement Probe Bleed Network
The CMF556M8100FKEA's 6.81 MΩ value is ideally suited for high-voltage probe bleed networks that bleed static charge to ground while presenting a known discharge time constant. At 6.81 MΩ combined with a typical 10–100 pF probe capacitance, the discharge RC is roughly 68–680 µs — fast enough to track AC line transients but slow enough to limit inrush when probing live circuits. The 250V maximum working voltage sets the upper limit for the probe class; the ±1% tolerance ensures calibration accuracy is preserved across probe swaps. Compared with carbon-film 5% parts, the CMF556M8100FKEA's metal-film stability keeps the probe's attenuation ratio within specification over years of field use.
Recomendado
Electrostatic Discharge (ESD) Bleed Resistor for Measurement Inputs
The CMF556M8100FKEA provides a high-impedance DC-bias path to ground on sensitive measurement inputs, bleeding off static charge while presenting minimal load to the signal source. A 6.81 MΩ resistor in this role keeps DC bias current in the sub-microamp range while the resistor itself sinks ESD charge to chassis ground — preventing damage to downstream FET-input ADC front-ends. The CMF-55 flame-retardant epoxy coating and ±100 ppm/°C TCR ensure the resistor survives transient surges and contributes negligible temperature-dependent drift to the measurement chain. This pattern is common in medical electrophysiology (ECG/EEG) front-ends, mass-spec ion detectors, and oscilloscope input-protection networks where input bias must be tightly controlled.
Recomendado
Precision Voltage Divider Reference Network
The CMF556M8100FKEA is a strong choice for the upper arm of a precision voltage divider where the lower arm is a much smaller value (e.g., 6.81 kΩ) — yielding a 1000:1 attenuation ratio for high-voltage measurement ADC inputs. At ±1% tolerance and ±100 ppm/°C, the divider's accuracy stays within 1% across the full -55°C to +175°C range without requiring calibration trim. The 0.5W power rating supports continuous operation at divider input voltages up to ~58V (P = V²/R gives 0.5W at V ≈ 58V), and the 250V working voltage comfortably covers this regime. This topology appears in industrial process-control analog front-ends, 4-20 mA loop isolators, and bench multimeter reference designs.
Recomendado
Medical and Scientific Instrumentation Front-End
In medical and scientific instrumentation, the CMF556M8100FKEA provides the high-impedance reference resistor that sets gain and bias for FET-input amplifiers used in pH meters, ion-selective electrodes, and Geiger-counter interfaces. Its ±1% tolerance keeps the gain calibration within instrument specification, while the ±100 ppm/°C TCR ensures that measurement drift across body-temperature or laboratory-environment variations remains under 50 ppm. The metal-film construction produces negligible 1/f noise compared with carbon composition — critical when extracting low-amplitude bioelectric signals. The CMF-55 epoxy coating also resists humidity and body-fluid exposure, making the part suitable for cleaned and sterilized medical equipment enclosures.
Recomendado
Industrial Process Control Loop Interface
The CMF556M8100FKEA appears in 4-20 mA current-loop isolators and industrial analog front-ends where it sets the input impedance and input-protection current limit. The 6.81 MΩ value, paired with input clamp diodes, limits fault current to a few milliamps even at 250V transients — protecting downstream ADC pins. The wide -55°C to +175°C operating range supports unconditioned cabinet installations and outdoor process-control panels. Use the CMF556M8100FKEA in series with a TVS diode to provide both voltage-clamping and over-current limiting, ensuring compliance with IEC 61010-1 measurement-category ratings. The 0.5W rating also supports continuous operation at elevated loop voltages.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CMF556M8100FKEA — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | CMF556M8100FKEB | CMF556M8100FKEK | CMF556M8100FKE | MFR-25FBF52-6M81 | EBW6M81J0 |
|---|---|---|---|---|---|---|
| Brand | Vishay Intertechnology | Vishay Intertechnology | Vishay Intertechnology | Vishay Intertechnology | Yageo | Stacktron Electronics |
| Package | Axial (CMF-55) | Axial (CMF-55) - same | Axial (CMF-55) - same | Axial (CMF-55) - same | Axial (MFR-25) - same | Axial - same |
| Resistance | 6.81 MΩ | 6.81 MΩ | 6.81 MΩ | 6.81 MΩ | 6.81 MΩ | 6.81 MΩ |
| Tolerance | ±1% | ±1% | ±1% | ±1% | ±1% | ±5% |
| Power Rating | 0.5 W | 0.5 W | 0.5 W | 0.5 W | 0.4 W (-20%) | 0.5 W |
| Temperature Coefficient | ±100 ppm/°C | ±100 ppm/°C | ±100 ppm/°C | ±100 ppm/°C | ±100 ppm/°C | ±100 ppm/°C |
| Max Working Voltage | 250 V | 250 V | 250 V | 250 V | 250 V | 250 V |
| Operating Temperature | -55°C to +175°C | -55°C to +175°C | -55°C to +175°C | -55°C to +175°C | -55°C to +155°C | -55°C to +175°C |
| Composition | Metal Film | Metal Film | Metal Film | Metal Film | Metal Film | Metal Film |
| Lead-Free / RoHS | Yes (e3) | Yes (e3) | Yes (e3) | Yes (e3) | Yes | Yes |
Diferenciadores clave
- Industrial-grade temperature range and safety rating (frente a Yageo MFR-25FBF52-6M81)
- Tighter tolerance than typical cross-brand axial substitutes (frente a Stacktron EBW6M81J0)
- Higher power rating than commercial cross-brand equivalents (frente a Yageo MFR-25FBF52-6M81)
Notas de diseño
At 6.81 MΩ, the resistor is highly sensitive to surface leakage on the PCB. Use a guard ring driven by a low-impedance node at the same potential as the resistor's "low" terminal to intercept surface currents that would otherwise flow across the high-impedance node to ground. For axial through-hole parts, leave a clearance of at least 1 mm between the resistor body and any low-impedance trace, and consider Teflon or conformal coating on the PCB surface for high-impedance analog front-ends.
Do not assume the 250V working voltage applies to DC and AC equally — the rating reflects peak voltage and is derated at high frequencies due to skin-effect and stray capacitance. For high-voltage AC divider applications above 1 kHz, calculate the dissipation factor (P = V_rms² × ω² × C² × R) and verify the 0.5W power limit is not exceeded. Estimated: at 250V rms and 10 kHz with 1 pF stray capacitance, additional dissipation is roughly 6 µW — well within limits — but at MHz frequencies this can become significant.
Although the CMF-55 package is rated 0.5W at 70°C ambient, derate linearly to 0W at +175°C. For continuous 0.4W operation in an enclosed industrial cabinet at 85°C ambient, the resistor body can reach 110°C — verify neighboring components tolerate this hotspot. In through-hole designs, leave at least 5 mm between adjacent high-power resistors to avoid cumulative heating.
Información de cumplimiento
RoHS compliant per 'e3' lead-free designation in part number. AEC-Q100 not applicable (passive resistor, no automotive qualification). Halogen-free status not stated in verified data.
