ROHM QS5W1 User Guide and Manual
Summary
Discover the QS5W1, a high-performance NPN Silicon epitaxial planar transistor designed primarily as a low-frequency amplifier driver. This comprehensive product manual provides all necessary engineering data for reliable circuit design, covering detailed absolute maximum ratings, precise electrical characteristics tables, sweeping performance curves, and complete operational guidelines (including switching time circuits). It is essential resource for electronics engineers and power supply designers seeking high stability and robust signal amplification components in their systems.
Page 1 Text Content
Data Sheet
Midium Power Transistors (30V / 3A) QS5W1 Structure Dimensions (Unit : mm) NPN Silicon epitaxial planar transistor
TSMT5
Features 1) Low saturation voltage VCE (sat) = 0.4V (Max.) (IC / IB= 1A / 50m A) 2) High speed switching
(1) Tr.1 Base (2) Emitter (3) Tr.2 Base
Applications (4) Tr.2 Collector
Abbreviated symbol : W01
(5) Tr.1 Collector
Low Frequency Amplifier Driver
Packaging specifications Inner circuit (Unit : mm)
Package TSMT5
Type (4)(5)
Code TR Basic ordering unit (pieces)
Tr.1 Tr.2
(1) Tr.1 Base (2) Emitter
Absolute maximum ratings (Ta = 25C)
(3) Tr.2 Base
(4) Tr.2 Collector (1) (2) (3)
<It is the same ratings for the Tr.1 and Tr.2>
(5) Tr.1 Collector
Parameter Symbol Limits Unit
Collector-base voltage VCBO Collector-emitter voltage VCEO Emitter-base voltage VEBO
DC IC
Collector current
Pulsed ICP *1 PD *2 0.5 W/Total Power dissipation PD *3 1.25 W/Total PD *3 0.9 W/Element
Junction temperature Tj C Range of storage temperature Tstg -55 to 150 C *1 Pw=10ms, Single Pulse *2 Mounted on a recommended land. *3 Mounted on a 25 x 25 x 0.8[mm] ceramic board.
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© 2011 ROHM Co., Ltd. All rights reserved. 1/5 2011.02 - Rev.A
Page Summary Contents For ROHM QS5W1 User Guide and Manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 6 |
| File Size | 1.06 MB |
| Published | July 16, 2026 |
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Frequently Asked Questions
What is the maximum total power dissipation for this transistor?
The maximum permissible total power dissipation (Pd) is 1.25 W.
What is the typical minimum collector-emitter saturation voltage (Vce(sat))?
The datasheet specifies that CE(sat) has a maximum rating of 0.4 V, measured at an emitter current (Ie) of 1A and base current (Ib) of 50mA.
What is the high-frequency performance limit of QS5W1?
The transition frequency (fT) for this transistor reaches up to 270 MHz under specified testing conditions.
How must I heat sink or mount the device safely?
Operation requires mounting on a recommended land, and safety limits are determined by observing the Safe Operating Area chart according to current (Ic) and voltage (Vce).