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
What are the key features of NT731JTTD103J3500J?
- 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
What is NT731JTTD103J3500J used for?
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.
What are the specifications of NT731JTTD103J3500J?
| 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 |
Where can I find the NT731JTTD103J3500J datasheet?
NT731JTTD103J3500J Datasheet DownloadOfficial datasheet from KOA Speer
What are equivalent replacements for NT731JTTD103J3500J?
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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Why Buy from FindMyChip
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 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
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