TG-121
IPEE Curtea de Argeș
- Manufacturer
- IPEE Curtea de Argeș
- Country
- Romania
- Year
- Unknown
- Category
- Components
- Type
- Thermistors
- Documentation score
- 1/5
- Last edited
- 17 OCT 2026
Specifications
- Type
- NTC, general use
- Standard
- STAS 9486-78
- Resistance at 25 °C (R25)
- 150–680 Ω (see Variants)
- Tolerance
- ±20 %
- Temperature coefficient at 25 °C (α25)
- -4.1–-3.7 %/°C (see Variants)
- Tolerance of α25
- ±0.3 %/°C
- Material constant (B)
- 3300–3650 K (see Variants)
- Resistance ratio
- 6.5
- Resistance ratio, definition
- R25/R65, ±20 %
- Max. dissipated power (Pd max)
- 0.6 W
- Dissipation factor (δ)
- 8…14 mW/°C
- Dissipation factor, min
- 8 mW/°C
- Dissipation factor, max
- 14 mW/°C
- Thermal time constant (τ)
- 60 s
- Climatic category
- 10/085/04
- Marking
- in clear: 150M, in clear: 200M, in clear: 250M, violet dot (see Variants)
- Package
- disc, lacquered
- Disc diameter (D)
- 7 mm
- Max. thickness (bmax)
- 4 mm
- Lead spacing (d)
- 5.1 mm
- Lead diameter
- 0.6 mm
- Min. lead length
- 45 mm
- Application
- general use
Variants (4)
| Note | Compare | |||||
|---|---|---|---|---|---|---|
| TG121-150 | 150 | -3.7 | 3300 | in clear: 150M | ||
| TG121-200 | 200 | -3.7 | 3300 | in clear: 200M | ||
| TG121-250 | 250 | -3.7 | 3300 | in clear: 250M | ||
| TG121-680 | 680 | -4.1 | 3650 | violet dot | 2nd edition only |
Click a column heading to sort. „+” adds a variant to the comparison (TG-121).
Description
The TG-121 is a series of general-use NTC thermistors in the form of lacquered discs („lăcuite”), made to STAS 9486-78 [1]. The Agenda radioelectronistului (2nd edition, 1989) gives four types, from 150 to 680 Ω at 25 °C, with a resistance tolerance of ±20 %, a maximum dissipated power of 0.6 W, a dissipation factor of 8…14 mW/°C, a thermal time constant of 60 s and climatic category 10/085/04; three are marked in clear with the value („150M”) and the TG121-680 with a violet dot [1]. The resistance ratio is 6.5 ± 20 % for all four; the 2nd edition heads it R25/R65 (the subscript is blurred in the 1st edition) [1][2].
The Agenda radioelectronistului names IPEE Electro-Argeș of Curtea de Argeș as the producer of the thermistors in its section on thermistors made in Romania, in both editions [3][4]. Un secol de electronică în România says that IPEE Curtea de Argeș was set up in 1973 by moving the lines of „chemical” resistors („rezistențe chimice”), ceramic capacitors and thermistors from IPRS Băneasa, and that the works’ resistor catalogue (in English) covered 16 families of resistors, among them varistors and thermistors [5].
The drawing (fig. 18.4) gives leads of Ø 0.6 mm, at least 45 mm long [1]. The 1st edition (1983) gives a disc diameter D of 8 mm and a thickness bmax of 5 mm (2nd edition: 7 and 4 mm) and has only the first three types; the TG121-680 is in the 2nd edition only [2][1].
Gallery
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References
- [1]N. Drăgulănescu – „Agenda radioelectronistului”, 2nd edition, Editura Tehnică, 1989, section 18.2.4 „Termistoare CTN, de uz general, disc, lăcuite, seria TG-121”, p. 227
- [2]N. Drăgulănescu – „Agenda radioelectronistului”, 1st edition, Editura Tehnică, 1983, section 3.3.2.4 „Termistoare CTN, de uz general, disc, lăcuite, seria TG-121”, pp. 196–197
- [3]N. Drăgulănescu – „Agenda radioelectronistului”, 2nd edition, Editura Tehnică, 1989, section 18.2 „Termistoare produse în R.S.R.”, p. 225
- [4]N. Drăgulănescu – „Agenda radioelectronistului”, 1st edition, Editura Tehnică, 1983, section 3.3.2 „Termistoare produse în R.S.R.”, p. 194
- [5]N. Millea, I. Constantinescu (coord.) – „Un secol de electronică în România”, Editura Academiei Române, 2020, sections VIII.1.2.6 and VIII.2.2, pp. 410 and 435