No image availableAD149
IPRS Băneasa
- Manufacturer
- IPRS Băneasa
- Country
- Romania
- Year
- Unknown
- Category
- Components
- Type
- Transistors
- Documentation score
- 2/5
- Last edited
- 05 OCT 2026
Specifications
- Material
- Ge
- Polarity
- PNP
- Max. power dissipation (Pc, Ptot)
- 30 W
- Max. collector–base voltage |Vcb|
- 50 V
- Max. collector–emitter voltage |Vce|
- 30 V
- Max. collector current |Ic|
- 3 A
- Transition frequency (ft)
- 0.3 MHz
- Collector–emitter saturation voltage (Vce sat)
- 0.4 V
- Thermal resistance, junction–ambient (Rth j-a)
- 1.5 °C/W
- Package
- TO-3
- Application
- low frequency, power
Sources: [1]
Description
The AD149 is a low-frequency germanium PNP power transistor listed in the Agenda radioelectronistului (2nd edition, 1989) among the bipolar transistors made in Romania by IPRS Băneasa, in a TO-3 package [1].
In the same list of IPRS germanium transistors, Un secol de electronică în România (2020) has the AD140 in this place [3].
Coded as (Pro Electron system) [2]:
| Part | Meaning |
|---|---|
| A | base material with an activation energy of 0.6–1 eV, e.g. germanium (0.67 eV) |
| D | low-frequency power transistor |
| 149 | serial number: three digits (100–999), for components for general use |
Vce sat measured at IC = 3 A [1].
Gallery
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Documents
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References
- [1]N. Drăgulănescu – „Agenda radioelectronistului”, 2nd edition, Editura Tehnică, 1989, section 28.2.4 „Tranzistoare cu germaniu, PNP, de joasă frecvență, de putere”, p. 524
- [2]N. Drăgulănescu – „Agenda radioelectronistului”, 2nd edition, Editura Tehnică, 1989, section 26.2 „Sistemul european PRO ELECTRON”, pp. 479–480
- [3]N. Millea, I. Constantinescu (coord.) – „Un secol de electronică în România”, Editura Academiei Române, 2020, section VIII.1.2.2, pp. 395–396