SMF31K2JT TE Connectivity Resistor (Resistor Moulded) In Stock
TE Connectivity SMF31K2JT is a flame-proof surface-mount moulded resistor with 31.2 kΩ resistance in a rectangular package measuring 10.5 mm x 5 mm, RoHS compliant and suitable for high-reliability industrial and safety-critical PCB applications. Available with worldwide shipping.
- Manufacturer
- TE Connectivity
- Package
- Resistor Moulded
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SMF31K2JT Datasheet PDF
- Category
- Resistor
- Price
- From $0.1658(MOQ 1)
- Temp Range
- -55.0°C to 275.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Flame-proof construction meets IEC 60115 safety requirements, preventing ignition propagation in fire-hazard environments such as industrial control and power supply circuits
- Surface-mount rectangular package (10.5 mm x 5 mm x 5 mm) with J-tolerance (±5%) enables standard SMT reflow assembly for automated high-volume production
- REACH and RoHS compliant materials ensure regulatory compliance for export to EU and global markets with no restricted substances
Applications
The SMF31K2JT is used in industrial power supplies, motor control circuits, and safety-rated equipment where flame-proof resistors are required to prevent fire propagation in the event of component overstress. Its surface-mount format and robust moulded construction make it suitable for high-voltage snubber networks, voltage divider circuits in 24 V and 48 V industrial control panels, and protective discharge paths in energy storage systems.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| Factory Lead Time | 19 Weeks, 2 Days |
| YTEOL | 8 |
| Additional Feature | FLAME PROOF |
| Construction | Rectangular |
| Mounting Feature | SURFACE MOUNT |
| Package Height | 5mm |
| Package Length | 10.5mm |
| Package Shape | RECTANGULAR PACKAGE |
| Package Style | SMT |
| Package Width | 5.5mm |
| Packing Method | TR |
| Physical Dimension | 10.5mm x 5.5mm x 5mm |
| Rated Power Dissipation (P) | 3W |
| Rated Temperature | 20°C |
| Resistance | 1200Ω |
| Resistor Type | FIXED RESISTOR |
| Size Code | 4122 |
| Surface Mount | YES |
| Technology | METAL FILM |
| Temperature Coefficient | 100ppm/°C |
| Terminal Shape | WRAPAROUND |
| Tolerance | 5% |
| Working Voltage | 500V |
| Package | Resistor Moulded |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8533.21.00.30 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SMF31K2JT:
suggested
Frequently Asked Questions
What resistance value and tolerance does the SMF31K2JT provide, and in what circuits is this value commonly used?
The SMF31K2JT has a resistance of 31.2 kΩ with J-tolerance of ±5%. This value is commonly used in voltage divider networks, pull-up/pull-down configurations for logic interfaces operating at 12 V to 48 V, and RC timing networks in industrial timer circuits where the 31.2 kΩ value combined with a capacitor of 10 nF to 100 nF sets time constants in the microsecond to millisecond range.
Why is the flame-proof construction of the SMF31K2JT important for industrial safety applications?
In industrial and commercial equipment subject to IEC 60950 or EN 60065 safety standards, resistors in high-voltage or high-power positions must not propagate flames if they fail under fault conditions. The SMF31K2JT's flame-proof moulded construction prevents the resistor body from sustaining combustion even under overload, a requirement for CE-marked or UL-listed power supplies, motor drives, and building automation controllers operating at mains voltages up to 230 V AC.
How does the SMF31K2JT package size compare to standard 0805 or 1206 chip resistors, and what mounting considerations apply?
The SMF31K2JT measures 10.5 mm long x 5 mm wide x 5 mm tall, which is substantially larger than a standard 1206 chip resistor (3.2 mm x 1.6 mm) or even a 2512 resistor (6.3 mm x 3.2 mm). This larger body accommodates higher power dissipation and provides the mass needed for flame-proof certification. PCB designers must allocate at least 12 mm x 7 mm keep-out area and verify sufficient solder pad land pattern dimensions to ensure reliable reflow attachment.
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Why Buy from FindMyChip
About TE Connectivity
TE Connectivity is a leading electronic component manufacturer. FindMyChip sources TE Connectivity ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.8500 | $0.85 |
| 100+ | $0.4783 | $47.83 |
| 142+ | $0.2550 | $36.21 |
| 250+ | $0.2040 | $51.00 |
| 500+ | $0.1785 | $89.25 |
| 1000+ | $0.1658 | $165.80 |
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