CMF556M8100FKEA - 6.81MΩ ±1% 0.5W Metal Film Resistor | Vishay Dale
N.º da peça: CMF556M8100FKEA ✓ Ativo| Qtd. | Preço unitário | 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 Visão geral
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 drop-in para CMF556M8100FKEA — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
CMF556M8100FKEB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CMF556M8100FKEK
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CMF556M8100FKE
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MFR-25FBF52-6M81
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
EBW6M81J0
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CMF556M8100FKEA Classificações máximas e características elétricas
| 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 operação | -55°C to +175°C |
| Maximum Working Voltage | 250 V |
| Encapsulamento / Caixa | Axial (CMF-55) |
| Tipo de montagem | Through Hole |
| Series | CMF Industrial |
| Recursos | 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) |
Guia de Configuração de Pinos do CMF556M8100FKEA axial
Configuração de pinos para CMF556M8100FKEA (pacote axial). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para CMF556M8100FKEA.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
CMF556M8100FKEA é adequado para 6 aplicaçãos: 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
Resumo dos produtos recomendados
Dados de referência de engenharia para CMF556M8100FKEA — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Industrial-grade temperature range and safety rating (vs Yageo MFR-25FBF52-6M81)
- Tighter tolerance than typical cross-brand axial substitutes (vs Stacktron EBW6M81J0)
- Higher power rating than commercial cross-brand equivalents (vs Yageo MFR-25FBF52-6M81)
Notas de projeto
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.
Informações de conformidade
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.
