SFR2500002550FR500 - 255Ω 0.4W 1% Metal Film Resistor | Vishay
N.º da peça: SFR2500002550FR500 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.18 | $0,18 |
| 10 | $0.15 | $1,50 |
| 100 | $0.09 | $9,00 |
| 500 | $0.07 | $35,00 |
| 1.000 | $0.06 | $60,00 |
| 5.000 | $0.04 | $200,00 |
SFR2500002550FR500 Visão geral
A metal film resistor is a passive electronic component whose resistive element is a thin homogeneous layer of metal alloy deposited on a high-grade ceramic substrate, then laser-trimmed to a precise resistance value. Metal film technology sits above carbon film in the resistor taxonomy (carbon film -> metal oxide film -> metal film -> precision wirewound), offering superior noise performance, tighter tolerance, and lower temperature coefficient - making metal film the default choice for general-purpose precision analog and signal-conditioning circuitry where carbon film drift or noise would be unacceptable.
Key features include a low-noise specification of maximum 1.5 µV/V for resistances above 1 MΩ, a long-term stability rating typical of the SFR25 family, lead-free construction compliant with current RoHS directives, and stable operation across industrial temperature ranges. The 0207 axial form factor provides mechanical robustness for through-hole assembly while remaining compact enough for dense PCB layouts.
Technically, the SFR25 construction uses a vacuum-deposited metal alloy film on a ceramic body, followed by a helical cut that precisely sets the resistance value. The end caps are force-fit, and the leads are tin-plated copperweld for reliable solderability. This process yields the tight ±1% tolerance directly out of the box, eliminating the need for hand-selection in most precision designs.
Typical applications include precision analog signal conditioning, instrumentation amplifier gain-setting, ADC/DAC reference networks, general-purpose pull-up/pull-down resistors in mixed-signal designs, and audio preamplifier circuitry where low noise is critical. The 255 Ω value is commonly used in RF termination networks, current-sense shunt references, and 4-20 mA loop termination.
When designing with this part, observe derating guidelines - at 70 °C ambient the rated 0.4 W should be reduced to keep the hot-spot temperature below the 155 °C maximum. For high-impedance circuits, the low noise specification ensures negligible self-generated voltage across the resistor.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in any single manufacturer datasheet.
Alternativas drop-in para SFR2500002550FR500 — 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:
SFR2500001000FR500
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SFR2500001001FR500
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SFR2500001500FR500
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SFR2500004700FR500
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SFR2500002551FR500
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SFR2500002550FR500 Classificações máximas e características elétricas
| Manufacturer | Vishay Beyschlag / BC Components |
| Series | SFR25 |
| Historical Part Number | SFR55 |
| Resistance | 255 Ω |
| Tolerance | ±1% |
| Power Rating | 0.4 W (400 mW) |
| Temperature Coefficient (TCR) | ±100 ppm/°C |
| Composition | Metal Film |
| Encapsulamento / Caixa | Axial (0207 size) |
| Tipo de montagem | Through Hole |
| Packaging | Tape & Reel (TR), 5000 pcs/reel |
| Lead Free Status | Lead Free |
| Noise | Max. 1.5 µV/V (for > 1 MΩ) |
| Temperatura de operação | -55 °C to +155 °C |
| RoHS Compliance | Compliant |
| Construction | Vacuum-deposited metal alloy film on ceramic body, helical cut |
Guia de Configuração de Pinos do SFR2500002550FR500 axial (0207 size)
Configuração de pinos para SFR2500002550FR500 (pacote axial (0207 size)). 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 SFR2500002550FR500.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
SFR2500002550FR500 é adequado para 6 aplicaçãos: Precision Analog Signal Conditioning, Current-Sense Shunt for Low-Current Sensing, Industrial 4-20 mA Loop Termination, Audio Preamplifier Bias Networks, ADC/DAC Reference and Pull-Down Networks, General-Purpose Pull-Up and Pull-Down.
Precision Analog Signal Conditioning
The SFR2500002550FR500's ±1% tolerance and ±100 ppm/°C TCR make it a strong fit for instrumentation amplifier gain-setting and active filter networks. With resistance tolerance five to ten times tighter than typical carbon film, it eliminates the need for trim pots in many precision designs. The 255 Ω value pairs naturally with op-amp feedback topologies such as inverting gain stages and Sallen-Key filters, where stable component values directly determine filter Q and cutoff accuracy.
Recomendado
Current-Sense Shunt for Low-Current Sensing
The 255 Ω resistance of the SFR2500002550FR500 makes it a viable low-side current-sense shunt for instrumentation monitoring 1-30 mA loads. At a 10 mA load current, the resistor develops 2.55 V across it, well suited to the common-mode range of most instrumentation amplifiers. The metal film construction minimizes thermoelectric EMF errors versus carbon film. Designers must respect the 0.4 W power rating - at 39 mA the resistor reaches its dissipation limit, so the part is best for low-current monitoring paths rather than power-rail current sensing.
Recomendado
Industrial 4-20 mA Loop Termination
The SFR2500002550FR500 is well suited to industrial process-control current loops where its 255 Ω value (in conjunction with parallel precision components) maps a 4-20 mA signal into a 1-5 V process variable for ADC acquisition. The ±1% tolerance ensures loop calibration stays within ISA 50.1 limits. Metal film's low noise floor (max 1.5 µV/V) preserves measurement integrity in HART-modulated signals superimposed on the loop current, where wideband noise would otherwise degrade digital communications reliability.
Recomendado
Audio Preamplifier Bias Networks
Low-noise audio preamplifier stages benefit from the SFR2500002550FR500's metal film construction, which generates significantly less current noise than carbon film alternatives. The 255 Ω value is commonly used as an emitter degeneration resistor in low-noise transistor input stages, where its tight tolerance directly sets stage transconductance and DC bias point stability. Combined with a thermally-matched environment, the ±100 ppm/°C TCR keeps bias drift within manageable limits across the amplifier's operating temperature range.
Recomendado
ADC/DAC Reference and Pull-Down Networks
In mixed-signal designs, the SFR2500002550FR500 serves as a precision pull-down, pull-up, or termination resistor adjacent to ADC inputs or DAC outputs. Tight ±1% tolerance improves linearity by eliminating mismatch between channels, while the metal film technology minimizes leakage and parasitic inductance versus surface-mount alternatives in low-frequency precision paths. Designers typically place the resistor as close to the converter pin as the through-hole package allows on mixed-technology boards.
Recomendado
General-Purpose Pull-Up and Pull-Down
The SFR2500002550FR500 works well as a digital logic pull-up or pull-down where its 255 Ω value combined with 0.4 W rating supports a wide range of pull-strength requirements. The through-hole form factor is mechanically robust for test points, debugger interfaces, and front-panel signal conditioning in industrial and laboratory equipment. At 5 V logic levels, the resistor dissipates only 100 mW in worst-case short circuit, well within its rating, making it a safe choice in legacy and through-hole assembly lines.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SFR2500002550FR500 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SFR2500001000FR500 | SFR2500001001FR500 | SFR2500001500FR500 | SFR2500004700FR500 | SFR2500002551FR500 |
|---|---|---|---|---|---|---|
| Package | Axial 0207 through-hole | Axial 0207 through-hole - same | Axial 0207 through-hole - same | Axial 0207 through-hole - same | Axial 0207 through-hole - same | Axial 0207 through-hole - same |
| Brand | Vishay | Vishay | Vishay | Vishay | Vishay | Vishay |
| Resistance | 255 Ω | 100 Ω | 1 kΩ | 150 Ω | 470 Ω | 2.55 kΩ |
| Tolerance | ±1% | ±1% | ±1% | ±1% | ±1% | ±1% |
| Power Rating | 0.4 W | 0.4 W | 0.4 W | 0.4 W | 0.4 W | 0.4 W |
| Temperature Coefficient | ±100 ppm/°C | ±100 ppm/°C | ±100 ppm/°C | ±100 ppm/°C | ±100 ppm/°C | ±100 ppm/°C |
| Composition | Metal Film | Metal Film | Metal Film | Metal Film | Metal Film | Metal Film |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
Principais diferenciais
- Historical BC Components / Vishay BC heritage with active production (vs Generic carbon film equivalents)
- Industry-standard 0207 axial footprint for broad second-source compatibility (vs Proprietary through-hole resistor packages)
- Tape and reel packaging supports automated through-hole insertion (vs Bulk-packaged through-hole resistors)
Notas de projeto
At 70 °C ambient, the SFR2500002550FR500 is rated for 0.4 W continuous power dissipation, but must be linearly derated above that temperature to 0 W at 155 °C. At a worst-case 25 °C ambient with 1 oz copper through-hole pad, the part can safely handle close to its full 0.4 W rating. Estimated: at 0.4 W into a 50 °C ambient, the hot-spot rises approximately 30 °C above ambient due to the axial package's thermal resistance (~75 °C/W). Ensure PCB layout keeps the body away from heat-generating components.
Through-hole axial resistors like the SFR2500002550FR500 require drilled pad diameters of approximately 0.9-1.0 mm for the 0.6 mm leads. Standard 2.54 mm (0.1 inch) lead pitch is recommended with a minimum pad-to-pad spacing of 10 mm to accommodate the 6.3 mm body length. For wave soldering, apply adequate flux and verify lead wetting on the bottom pad; for hand assembly, pre-tin both pads and lead ends to ensure reliable joint formation.
Do not exceed the absolute maximum working voltage, which for the 0207-size SFR25 series is typically 250 V DC. Applying higher voltages can cause internal arcing between the helical film turns. Also, avoid mounting the resistor adjacent to large heat-generating components without verifying that the combined thermal environment still allows for proper power derating. Finally, observe the resistor's polarity-neutral construction; while it can be installed in either orientation, consistent lead-bending direction simplifies assembly and rework.
Informações de conformidade
Lead-free and RoHS-compliant per Digi-Key product attributes. Not AEC-Q100 qualified (passive component, automotive qualification typically not applicable to through-hole resistors). Halogen-free construction implied by lead-free materials. Conflict minerals compliance per Vishay standard policy.
