CMF556M8100FKEA - 6.81MΩ ±1% 0.5W Metal Film Resistor | Vishay Dale
料号： CMF556M8100FKEA ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： CMF556M8100FKEA ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
CMF556M8100FKEB
✅ 直接替换📋 参考替代料（不在目录中）
CMF556M8100FKEK
✅ 直接替换📋 参考替代料（不在目录中）
CMF556M8100FKE
✅ 直接替换📋 参考替代料（不在目录中）
MFR-25FBF52-6M81
✅ 直接替换📋 参考替代料（不在目录中）
EBW6M81J0
✅ 直接替换📋 参考替代料（不在目录中）
CMF556M8100FKEA 最大额定值与电气特性
| 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 |
| 工作温度 | -55°C to +175°C |
| Maximum Working Voltage | 250 V |
| 封装 / 外壳 | Axial (CMF-55) |
| 安装类型 | Through Hole |
| Series | CMF Industrial |
| 特性 | 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) |
CMF556M8100FKEA axial 引脚配置指南
CMF556M8100FKEA（axial 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： CMF556M8100FKEA.
请参阅 数据手册 以查看完整引脚配置。
典型应用
CMF556M8100FKEA 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： CMF556M8100FKEA ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Industrial-grade temperature range and safety rating （对比 Yageo MFR-25FBF52-6M81)
- Tighter tolerance than typical cross-brand axial substitutes （对比 Stacktron EBW6M81J0)
- Higher power rating than commercial cross-brand equivalents （对比 Yageo MFR-25FBF52-6M81)
设计说明
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.
合规信息
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.
