NT731JTTD103J3500J KOA Speer Thermistor (Thermistors Chip) In Stock
KOA Speer NT731JTTD103J3500J is a 10 kΩ NTC chip thermistor in a compact 0603 SMT package (1.6 mm × 0.8 mm × 0.5 mm) for precision temperature sensing. ±5% resistance tolerance and REACH/RoHS-compliant lead-free construction ensure accurate, environmentally safe thermal monitoring. Available in 7-inch tape-and-reel from authorized distributors with worldwide shipping.
- Manufacturer
- KOA Speer
- Package
- Thermistors Chip
- Pin Count
- 2
- Lifecycle
- OBSOLETE
- Datasheet
- NT731JTTD103J3500J Datasheet PDF
- Category
- Thermistor
- Price
- From $0.2380(MOQ 5000)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 10 kΩ NTC thermistor in a 0603 SMT package (1.6 × 0.8 × 0.5 mm) for space-efficient temperature sensing on compact PCBs
- ±5% (J-grade) resistance tolerance provides consistent temperature accuracy across production lots, reducing calibration overhead in high-volume designs
- REACH-compliant and RoHS lead-free construction with 7-inch tape-and-reel packaging supports automated SMT assembly and global regulatory compliance
Applications
The NT731JTTD103J3500J is used for thermal management in battery packs, power supplies, and consumer electronics where a 10 kΩ NTC thermistor at 25°C feeds a microcontroller ADC for over-temperature protection and fan speed control. Its 0603 form factor fits on densely populated PCBs in wearable devices, IoT sensors, and industrial control boards where larger through-hole thermistors would not fit. Lead-free construction and REACH compliance make it suitable for medical devices and automotive-adjacent applications requiring strict environmental certification.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| YTEOL | 0 |
| JESD-609 Code | e3 |
| Mounting Feature | SURFACE MOUNT |
| Package Height | 0.5mm |
| Package Length | 1.6mm |
| Package Style | SMT |
| Package Width | 0.8mm |
| Packing Method | TR, PAPER, 7 INCH |
| Rated Power Dissipation (P) | 0.005W |
| Resistance | 10000Ω |
| Resistor Type | NTC THERMISTOR |
| Surface Mount | YES |
| Technology | METAL GLAZE/THICK FILM |
| Terminal Finish | MATTE TIN OVER NICKEL |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | WRAPAROUND |
| Thermal Sensitivity Index | 3500K |
| Thermistor Application | TEMPERATURE COMPENSATION |
| Tolerance | 5% |
| Package | Thermistors Chip |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8533.40.80.70 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How do designers use the 10 kΩ NTC resistance of the NT731JTTD103J3500J with a microcontroller ADC for temperature measurement?
A typical voltage-divider circuit pairs the 10 kΩ NTC thermistor with a fixed 10 kΩ reference resistor connected between Vcc (3.3 V or 5 V) and ground, with the mid-point connected to an ADC input. At 25°C the output is near Vcc/2, and the voltage shifts as temperature changes according to the Steinhart-Hart equation. A 10-bit ADC provides approximately 0.1°C resolution near 25°C, sufficient for battery temperature cutoff and thermal throttling in consumer electronics.
What does the 0603 package size (1.6 mm × 0.8 mm) of the NT731JTTD103J3500J mean for PCB thermal coupling accuracy?
The 1.6 mm × 0.8 mm × 0.5 mm chip body allows the thermistor to be placed within 1 mm to 2 mm of the heat-generating component being monitored, reducing thermal lag compared to a bulkier through-hole sensor. On a 4-layer PCB, copper pour beneath the 0603 pads conducts heat from adjacent ICs directly to the thermistor, improving response time to within a few seconds for transient over-temperature events in power management designs.
When does the ±5% (J-grade) tolerance of the NT731JTTD103J3500J require factory calibration versus tighter-tolerance alternatives?
A ±5% resistance tolerance at 25°C corresponds to roughly ±1.2°C to ±2°C uncertainty depending on the thermistor's B-constant. For battery over-temperature cutoffs at 60°C with a ±5°C acceptable window, J-grade tolerance is adequate without individual calibration. Applications requiring better than ±0.5°C accuracy — such as medical diagnostics or precision HVAC controls — should use tighter ±1% (F-grade) or ±0.5% thermistors, accepting the higher per-unit cost.
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About KOA Speer
KOA Speer is a leading electronic component manufacturer. FindMyChip sources KOA Speer ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 5000+ | $0.2380 | $1190.00 |
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