ROHM SST4401 MMST4401 User Guide and Manual
Summary
This NPN medium power transistor (SST4401/MMST4401) is designed for reliable switching applications in electronic circuits. The comprehensive manual provides detailed operational data, including absolute maximum ratings, crucial electrical characteristics, and various performance curves—such as saturation voltages, DC current gain ($\text{hFE}$), and transient response times ($\text{tr}$, $\text{tf}$). It is essential documentation for circuit designers and electronics engineers selecting a robust component requiring predictable power handling and switching precision.
Page 1 Text Content
SST4401 / MMST4401
Transistors
NPN Medium Power Transistor (Switching) SST4401 / MMST4401
Features Dimensions (Unit : mm)
1) BVCEO>40V (IC=1m A)
SST4401
2) Complements the SST4403 / MMST4403.
Package, marking, and packaging specifications
(1) Emitter Part No. SST4401 MMST4401 (2) Base ROHM : SST3 (3) Collector
Packaging type SST3 SMT3
Marking R2X R2X
MMST4401
Code T116 T146
Basic ordering unit (pieces)
(1) Emitter
Absolute maximum ratings (Ta=25°C) ROHM : SMT3
(2) Base
EIAJ : SC-59 (3) Collector
Parameter Symbol Limits Unit
Collector-base voltage VCBO
Collector-emitter voltage VCEO Emitter-base voltage VEBO Collector current IC 0.6
Collector power dissipation
Junction temperature Tj ˚C
Storage temperature Tstg −55 to +150 ˚C
∗ Mounted on a 7 5 0.6mm CERAMIC SUBSTRATE+
Electrical characteristics (Ta=25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Collector-base breakdown voltage BVCBO IC=100µA
Collector-emitter breakdown voltage BVCEO IC=1m A Emitter-base breakdown voltage BVEBO IE=100µA Collector cutoff current ICBO 0.1 µA VCB=35V Emitter cutoff current IEBO 0.1 µA VEB=5V
0.4 IC/IB=150m A/15m A
Collector-emitter saturation voltage VCE(sat)
0.75 IC/IB=500m A/50m A 0.95 IC/IB=150m A/15m A
Base-emitter saturation voltage VBE(sat)
1.2 IC/IB=500m A/50m A VCE=1V, IC=0.1m A VCE=1V, IC=1m A DC current transfer ratio h FE VCE=1V, IC=10m A VCE=1V, IC=150m A VCE=2V, IC=500m A
Transition frequency f T MHz VCE=10V, IE= −20m A, f=100MHz Collector output capacitance Cob 6.5 p F VCB=10V, f=100k Hz Emitter input capacitance Cib p F VEB=0.5V, f=100k Hz Delay time td ns VCC=30V, VEB(OFF)=2V, IC=150m A, IB1=15m A
tr ns VCC=30V, VEB(OFF)=2V, IC=150m A, IB1=15m ARise time
Storage time tstg ns VCC=30V, IC=150m A, IB1=-IB2=15m A
tf ns VCC=30V, IC=150m A, IB1=-IB2=15m A Fall time
Rev.B 1/3
Page Summary Contents For ROHM SST4401 MMST4401 User Guide and Manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 4 |
| File Size | 99.13 KB |
| Published | June 20, 2026 |
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Frequently Asked Questions
What are the electrical limitations for the collector voltage?
The Collector-emitter voltage (VCEO) limit is 40 V.
Which device complements the SST4401 transistor?
It complements the SST4403 / MMST4403 series.
What must I do if I use this component in a critical application?
You must consult a sales representative, taking into account derating and implementing sufficient safety features for high reliability.