ROHM UMT3904 SST3904 MMST3904 User Guide
Summary
These NPN General Purpose Transistors are robust components designed for general electronic applications, including audio, communication, and automation equipment. This technical manual provides a comprehensive deep dive into product specifications, covering absolute maximum ratings, detailed electrical characteristics (such as hFE and fT), and performance curves like saturation and time response. Engineers can rely on this datasheet for selecting the optimal transistor solution, which includes various packages suitable for diverse PCB mounting requirements.
Page 1 Text Content
UMT3904 / SST3904 / MMST3904
Transistors
NPN General Purpose Transistor UMT3904 / SST3904 / MMST3904 Features Dimensions (Unit : mm) 1) BVCEO > 40V (IC = 1m A)
2) Complements the UMT3906 / SST3906 / MMST3906. UMT3904
(1) Emitter
ROHM : UMT3
EIAJ : SC-70 (2) Base (3) Collector
SST3904
Package, marking and packaging specifications Part No. UMT3904 SST3904 MMST3904
Packaging type UMT3 SST3 SMT3
(1) Emitter
Marking R1A R1A R1A
(2) Base
ROHM : SST3
Code T106 T116 T146 (3) Collector
Basic ordering unit (pieces)
MMST3904
Absolute maximum ratings (Ta = 25°C) (1) Emitter
ROHM : SMT3
(2) Base
EIAJ : SC-59
Parameter Symbol Limits Unit (3) Collector
Collector-base voltage VCBO
Collector-emitter voltage VCEO Emitter-base voltage VEBO
Collector current IC 0.2
UMT3904,
Collector
SST3904, 0.2
power PC
MMST3904
dissipation
SST3904, MMST3904 0.35
Junction temperature Tj °C Storage temperature Tstg −55 to +150 °C
∗ When mounted on a 7 x 5 x 0.6 mm ceramic board.
Electrical characteristics (Ta = 25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Collector-base breakdown voltage BVCBO IC = 10µA
Collector-emitter breakdown voltage BVCEO IC = 1m A Emitter-base breakdown voltage BVEBO IE = 10µA
Collector cutoff current ICES n A VCB = 30V Emitter cutoff current IEBO n A VEB = 3V
0.2 IC/IB = 10m A/1m A
Collector-emitter saturation voltage VCE(sat)
0.3 IC/IB = 50m A/5m A
0.65 0.85 IC/IB = 10m A/1m A
Base-emitter saturation voltage VBE(sat)
0.95 IC/IB = 50m A/5m 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 = 50m A VCE = 1V , IC = 100m A
Transition frequency f T MHz VCE = 20V , IE = −10m A, f = 100MHz
Collector output capacitance Cob p F VCB = 10V , f = 100k Hz Emitter input capacitance Cib p F VEB = 0.5V , f = 100k Hz Delay time td ns VCC = 3V , VBE(OFF) = 0.5V , IC = 10m A , IB1 = 1m A tr ns VCC = 3V , VBE(OFF) = 0.5V , IC = 10m A , IB1 = 1m ARise time Storage time tstg ns VCC = 3V , IC = 10m A , IB1 = −IB2 = 1m A tf ns VCC = 3V , IC = 10m A , IB1 = −IB2 = 1m A Fall time
Rev.B 1/4
Page Summary Contents For ROHM UMT3904 SST3904 MMST3904 User Guide
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 5 |
| File Size | 121.86 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
Are these transistors suitable for life-critical or safety-related applications?
No, if your equipment is life-critical (e.g., medical or aerospace), consult a sales representative and apply derating measures to prevent failure.
What are the key electrical specifications for the UMT3904?
The device has a collector-emitter voltage (VCEO) of 40V and a maximum collector current (IC) of 0.2A.
Which models serve as complementary parts to this transistor?
They complement the UMT3906, SST3906, and MMST3906 series.
What physical packages are used for these components?
The available package types include EIAJ SC-70 and SC-59.