Product Overview
TTF-103 Film-Coated 10K NTC Thermistor, 3435K Beta, -40 to +100C, Insulated Leads and Two-Pin Connector, Sold Each
Condition
Unused new old stock. Evaluation was visual only; function testing was not performed and no meter was put on this piece. On the photographed sample the amber film body shows lengthwise fold lines and a small dark speck near the tip, the black insulated twin lead runs unkinked, and the small white connector housing at the free end is intact with no cracks visible. White lettering is printed on the lead sleeving and is only partly legible at this magnification, so read it on the piece in hand rather than from the photos.
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Product Overview
TTF-103 is the 10k ohm member of the TTF series of radial-leaded, film-coated NTC thin film thermistors, and the series spec sheet is included in the photos so you can read the numbering system and the electrical table yourself. In that table the 10K (103) part carries a B25/85 value of 3435K, a maximum power rating of 3.5 mW, a dissipation factor of approximately 0.7 mW/C, a thermal time constant of approximately 5 seconds, and a -40 to +100C operating range, with UL recognition under file E223037 and RoHS compliance listed in the feature block. The 103 suffix is the EIA code for 10 x 10^3 ohms, so base resistance is 10k ohm at 25C. What the photos add to the datasheet is the assembly: the sample is not a bare radial-leaded chip but a wired sensor, with the flat film element on one end, a black insulated twin lead running out of it, and a small white connector housing on the free end. Lead length was recorded as approximately 6 inches in our sourcing notes; there is no ruler in these photos, so treat that figure as a note, not a measurement. The film itself is described on the datasheet only as an insulation film coating; it photographs as the amber-gold polyimide type commonly called Kapton, and no film brand is legible in these photos. Flat and low profile is the whole point of this shape: it goes where a bead or a resin-coated probe will not fit, pressed or bonded against the surface whose temperature you actually care about. Sold each, one thermistor per unit ordered.
Key Features
- Resistance: 10k ohm at 25C, the 103 EIA code for 10 x 10^3 ohms
- Type: NTC thin film thermistor, radial leaded, insulation film coated
- Beta: B25/85 of 3435K for the 103 part per the series datasheet shown in the photos
- Operating temperature range: -40C to +100C
- Maximum power rating: 3.5 mW
- Dissipation factor: approximately 0.7 mW/C
- Thermal time constant: approximately 5 seconds
- Agency recognition: UL file E223037, and RoHS compliance per the datasheet feature list
- Termination on the photographed sample: black insulated twin lead ending in a small white connector housing, no part number or pin count legible on the housing
- Tolerance: Not confirmed. The series offers R25 grades of plus or minus 1, 2, 3, 5 and 10 percent and beta grades of plus or minus 1 to 3 percent, and no identifying suffix is legible on the part in these photos. Verify against the datasheet before use in a calibrated circuit.
- Lead length: approximately 6 inches per our sourcing notes, not measured against a ruler in these photos
Applications
- Battery pack builders who need a flat sensor that slips between cells and reports pack temperature back to a protection board
- Repair techs bonding a temperature sensor to an appliance or HVAC control surface where the original probe well is gone or the space is too tight for a bead
- 3D printer owners running a heated bed at or below 100C who want a low-profile bed sensor rather than a cartridge in a hole
- Makers building an Arduino or Raspberry Pi logger who want a known 10K NTC curve in a voltage divider instead of a mystery sensor
Frequently Asked Questions
What beta value do I load into my firmware or lookup table?
The series electrical table in the photos lists B25/85 of 3435K for the 10K (103) part, so that is the curve to start from. The beta tolerance grade is encoded in a suffix that is not legible on this piece, so if your control loop depends on tight accuracy, read the datasheet page in the photos and confirm the curve against a known reference before you trust a calibrated reading.
Does it come with the connector shown in the photos?
The photographed sample is terminated in a small white connector housing; we have not confirmed that every piece in this stock carries the same lead and connector. The housing carries no legible part number and we have not counted its pins or measured its pitch, so plan on identifying or removing it yourself rather than counting on it mating with a specific header.
Can I put it on a 3D printer heated bed?
Within its rating, yes. The datasheet range is -40 to +100C, which covers a PLA or PETG bed comfortably and sits right at the edge of a hot ABS bed. It is not a hotend sensor and nothing here supports running it past +100C.
Does it need supporting circuitry?
Yes. This is a passive resistive element, not a temperature transmitter. It wants a voltage divider with a pull-up or pull-down resistor feeding a microcontroller ADC or a temperature controller. Keep the sensing current modest: maximum power is 3.5 mW and the dissipation factor is about 0.7 mW/C, so a lazy divider will self-heat the sensor and read high.
It is sold untested. What am I actually taking on?
You are taking on the electrical verification. These are unused stock that was inspected visually and never put on a meter, so the photos and the series datasheet page are the spec you are buying against: a 10K NTC film sensor on an insulated lead with a connector, with the tolerance grade unidentified. For most divider and monitoring work that is a two-minute ohmmeter check at room temperature, and because these are sold each you can order one to check the curve before committing to the count your build needs. Shipping is a flat $8 per order, free once the order passes $28, and orders leave our Idaho warehouse the same or next business day.
No display, no protocol, no opinion, just a resistance that falls as things warm up, wrapped in a fold of amber film thin enough to slip where a probe will not fit. Wire it into a divider and let your board find out what that hot spot is really doing.
