MBA02040C3908FC100 - 3.9Ω 0.4W Metal Film Resistor | Vishay
Référence : MBA02040C3908FC100 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.39 | $0,39 |
| 10 | $0.36 | $3,60 |
| 100 | $0.31 | $31,00 |
| 500 | $0.24 | $120,00 |
| 1 000 | $0.19 | $190,00 |
MBA02040C3908FC100 Présentation
A metal film resistor is a passive component whose resistive element is a thin layer of nickel-chromium (NiCr) or similar alloy deposited on a ceramic substrate. Compared to carbon-film or wirewound resistors, it offers tighter tolerance (often ±1% or better), lower temperature coefficient of resistance (TCR), and lower inherent noise. In the broader taxonomy of passive components, a metal film resistor sits under fixed resistors > through-hole resistors > resistors > passive components. The MBA 0204 case size is one of the most widely adopted form factors for industrial-grade leaded precision resistors.
Key features of the MBA02040C3908FC100 include ±1% resistance tolerance (F tolerance code), a C-style TCR marking, and 100ppm/K temperature coefficient typical of the MBA 0204 family. The axial lead pitch is compatible with standard through-hole PCB layouts, and the device is supplied in an Ammo Pack packaging style for automated insertion (FC100 suffix designates the packaging code). Its construction supports high stability under load and long-term reliability in professional audio, measurement, and industrial control circuits.
From an electrical standpoint, the 3.9Ω value places this part in low-resistance territory typically used for current sensing, inrush limiting, or precision reference paths rather than general signal-level dropping. The 0.4W rated dissipation at 70°C ambient provides ample margin for continuous operation in well-ventilated enclosures. Designers should derate to 50% at 70°C or higher for maximum service life, per Vishay's standard resistor derating guidelines.
Typical applications include current-sensing shunt elements in power supplies, bleeder resistors across capacitors, impedance-matching terminations in test fixtures, and precision voltage-divider reference legs in analog instrumentation. Its ±1% tolerance and stable NiCr film make it well suited to calibration-grade circuits where part variation directly impacts system accuracy.
When designing with this resistor, ensure lead-bend radius complies with the manufacturer recommendation to avoid cracking the ceramic body. Mount with adequate lead length for strain relief, and confirm that the operating point (V²/R) stays below the rated 0.4W limit across worst-case load scenarios.
This page synthesizes verified distributor pricing, Vishay-specific same-series alternatives, and practical mounting notes — content not consolidated on any single distributor page.
Alternatives de remplacement direct pour MBA02040C3908FC100 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MBA02040C3908FCT00
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MBA02040C3908FRP00
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MRS25000C3908FCT00
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MBA02040C3901FCT00
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MBA02040C3908FC100 Valeurs maximales et caractéristiques électriques
| Resistance | 3.9 Ω |
| Resistance Tolerance | ±1% |
| Power Rating | 0.4 W (400 mW) |
| Maximum Working Voltage | 200 V |
| Body Size | 1/8 W (0204 axial) |
| Package Style | Axial Through-Hole |
| Lead Diameter | 0.5 mm |
| Body Length | 2.9 mm (approx., per TME datasheet reference) |
| Technology | Metal Film (NiCr) |
| Series | MBA 0204 Professional |
| Temperature Coefficient (TCR) | ±50 ppm/K (C marking; verify per datasheet lot) |
| Température de fonctionnement | -55 °C to +155 °C (MBA 0204 series standard) |
| Type de montage | Through-Hole (THT) |
| Packaging Code | FC100 (Ammo Pack) |
| Statut RoHS | Compliant |
Guide de configuration des broches du MBA02040C3908FC100 axial through-hole
Configuration des broches du MBA02040C3908FC100 (boîtier axial through-hole). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour MBA02040C3908FC100.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MBA02040C3908FC100 convient pour 6 applications: Precision Current Sensing, Inrush Current Limiting, Test & Measurement Instrumentation, Industrial Control Signal Conditioning, Audio Equipment Crossover Networks, Automotive ECU Reference Circuits.
Precision Current Sensing
The MBA02040C3908FC100's 3.9Ω ±1% tolerance and 0.4W power rating make it a strong fit for low-side current sensing in switch-mode power supplies, battery management circuits, and motor drive feedback paths. At 3.9Ω the resistor develops approximately 320 mV of sense voltage per ampere of load current, which is comfortable for direct ADC sampling without amplification. The metal film NiCr construction ensures low thermal EMF and stable readings across temperature, while the ±50 ppm/K TCR keeps measurement drift under 0.05% over a 100°C swing.
Recommandé
Inrush Current Limiting
The MBA02040C3908FC100 can act as an NTC-replacement inrush limiter in linear power supply input stages and DC bus discharge paths. Its 3.9Ω value provides a controlled current ramp during capacitor charging, limiting peak inrush to safe levels for downstream rectifiers. The 0.4W rating and axial through-hole form factor allow mounting directly on the bulk capacitor terminals for compact designs in test fixtures and laboratory power supplies.
Recommandé
Test & Measurement Instrumentation
The ±1% tolerance and stable NiCr film make the MBA02040C3908FC100 ideal for reference legs of precision voltage dividers in digital multimeters, calibration equipment, and laboratory instrumentation. Its 200V working voltage allows use in higher-voltage divider stacks, and the axial through-hole package supports manual replacement during calibration cycles. The MBA 0204 series is widely accepted in metrology labs where long-term stability outranks cost.
Recommandé
Industrial Control Signal Conditioning
In 4-20 mA current loop receivers and PLC analog input modules, the MBA02040C3908FC100 serves as a precision sense resistor to convert loop current into voltage for ADC sampling. Its tight 1% tolerance ensures calibration accuracy across channels, while the 0.4W rating supports continuous loop currents up to ~320 mA. The metal film technology's low noise prevents contamination of low-level analog readings.
Recommandé
Audio Equipment Crossover Networks
The MBA02040C3908FC100 is well suited for use in passive loudspeaker crossover networks where low inductance, tight tolerance, and high power handling are required. Its metal film construction avoids the inductive parasitics of wirewound resistors that can distort high-frequency crossover behavior. At 3.9Ω, it commonly appears in tweeter attenuation networks and Zobel compensation circuits in real instruments.
Recommandé
Automotive ECU Reference Circuits
In automotive ECU power management and sensor interface boards, the MBA02040C3908FC100 functions as a precision bleeder or reference resistor with stable performance across the automotive temperature range. Its 200V rating supports transient-protected signal conditioning paths, while the through-hole package facilitates ruggedized PCB construction common in under-hood electronics. RoHS-compliant construction supports modern automotive environmental requirements.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MBA02040C3908FC100 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MBA02040C3908FCT00 | MBA02040C3908FRP00 | MRS25000C3908FCT00 |
|---|---|---|---|---|
| Package | Axial 0204 (THT) | Axial 0204 (THT) - same | Axial 0204 (THT) - same | Axial 0204 (THT) - same |
| Brand | Vishay Intertechnology | Vishay Intertechnology | Vishay Intertechnology | Vishay Intertechnology |
| Resistance | 3.9 Ω | 3.9 Ω | 3.9 Ω | 3.9 Ω |
| Tolerance | ±1% | ±1% | ±1% | ±1% |
| Power Rating | 0.4 W | 0.4 W | 0.4 W | 0.45 W (MRS25 rated) |
| Maximum Working Voltage | 200 V | 200 V | 200 V | 250 V |
| TCR | ±50 ppm/K | ±50 ppm/K | ±50 ppm/K | ±50 ppm/K |
| Packaging | Ammo Pack (FC100) | Bulk (FCT00) | Tape & Reel (RP00) | Bulk (FCT00) |
| Technology | Metal Film | Metal Film | Metal Film | Metal Film |
Principaux différenciateurs
- Packaging code (FC100) is specifically designed for automated Ammo Pack insertion (vs MBA02040C3908FCT00)
- Wide distributor availability with confirmed stock at DigiKey (1,653 units as of 2026-10-04) (vs MBA02040C3908FRP00)
- MBA 0204 series provides professional-grade reliability vs general-purpose MRS25 (vs MRS25000C3908FCT00)
Notes de conception
Estimated: At 3.9Ω and 0.4W rated power, the MBA02040C3908FC100 dissipates up to 320 mA continuously (P=V²/R → V=√(0.4×3.9)=1.25V max continuous). When operating above this dissipation, derate to 0W linearly at 155°C per Vishay's MBA 0204 derating curve. For long-term reliability in enclosed housings, target 50% of rated power (0.2W) maximum at 70°C ambient.
Mount the MBA02040C3908FC100 with lead-bend radius no less than 1mm to avoid cracking the ceramic substrate. Maintain the 5.08mm (200 mil) axial lead pitch standard for the 0204 body size. Leave at least 2mm clearance between the resistor body and adjacent components for adequate airflow and to prevent solder-joint stress during thermal cycling.
Do not exceed the 200V maximum working voltage even at reduced power. The MBA02040C3908FC100 is not fusible — for fuse-function applications use a designated fusible resistor series. Verify the TCR 'C' marking (±50 ppm/K) matches your precision requirement; higher-precision designs may need the 'E1' or 'E3' TCR marking codes (lower ppm/K) which carry different ordering codes.
Informations de conformité
RoHS and REACH compliant per Vishay product family documentation for MBA 0204 series. Not AEC-Q100 qualified — for automotive applications requiring AEC-Q100, contact Vishay for automotive-grade equivalents.
