General view

BSW21

IPRS Băneasa

Year
Unknown
Category
Components
Type
Transistors
Documentation score
1/5
Last edited
06 OCT 2026

Specifications

Material
Si
Polarity
PNP
Max. power dissipation (Pc, Ptot, Pd)
0.3 W
Max. collector–base voltage |Vcb|
25–50 V (see Variants)
Max. collector–emitter voltage |Vce|
25–50 V (see Variants)
Max. emitter–base voltage |Veb|
5 V
Max. collector current |Ic|
0.2 A
Max. junction temperature (Tj)
175 °C
Transition frequency (ft)
150 MHz
DC current gain (hFE), min
75
DC current gain (hFE), max
225
Collector–emitter saturation voltage (Vce sat)
0.5 V
Package
TO-18
Application
switching

Sources: [1]

Variants (2)

BSW212525
BSW21A5050

Click a column heading to sort. „+” adds a variant to the comparison (BSW21).

Description

The BSW21 is a silicon PNP switching transistor listed in the Agenda radioelectronistului (2nd edition, 1989) among the bipolar transistors made in Romania by IPRS Băneasa, in a TO-18 package [1].

Coded as (Pro Electron system) [2]:

Part Meaning
B base material with an activation energy of 1.0–1.3 eV, e.g. silicon (1.1 eV)
S low-power switching transistor
W21 serial number for components for professional use: a letter (X, Y, Z…, with no coded meaning) and two digits (10–99)
A letter with no coded meaning, marking a constructional variant

hFE (h21E) measured at IC = 2 mA, VCE = 4.5 V; Vce sat at IC = 50 mA [1].

Gallery

IPRS Băneasa BSW21: TO-18 pinoutNo image available
TO-18 pinout

Documents

No documents available yet.

References

  1. [1]N. Drăgulănescu – „Agenda radioelectronistului”, 2nd edition, Editura Tehnică, 1989, section 28.2.17 „Tranzistoare cu siliciu, PNP, de comutație”, p. 538
  2. [2]N. Drăgulănescu – „Agenda radioelectronistului”, 2nd edition, Editura Tehnică, 1989, section 26.2 „Sistemul european PRO ELECTRON”, pp. 479–480