ROHM MMST918 PN918 Data Sheet
Summary
The MMST918 is a high-performance NPN High Frequency Power Transistor, designed for demanding switching and amplification applications requiring reliable operation up to an impressive $fT$ of 600MHz. This comprehensive datasheet provides electronics engineers with all necessary parameters, including absolute maximum ratings, critical electrical characteristics (such as current gain, output power, and capacitances), and detailed technical curves required for implementing stable and optimized circuit designs.
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MMST918 / PN918
Transistors
NPN High Frequency Transistor MMST918 / PN918
Features External dimensions (Unit : mm)
1) High current gain-bandwidth product f T=600MHz
MMST918 1.1 −0.1
Package, marking, and packaging specifications
(1) Emitter
Part No. MMST918 PN918 (3)
ROHM : SMT3 +0.1 (2) Base
Packaging type SMT3 TO-92 0.15 −0.06+0.1
EIAJ : SC-59 0.4 −0.05 (3) Collector Marking RVX All terminals have same dimensions
Code T146 T93
Basic ordering unit (pieces)
PN918 4.8±0.2 3.7±0.2
Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit
Collector-base voltage VCBO (1) Emitter
(1) (2) (3) 2.5+0.3 (1 2. 7M in 4. 8± 0.
Collector-emitter voltage VCEO ROHM : TO-92 −0.1 (2) Base
EIAJ : SC-43 −0.05 2.3 (3) Collector
Emitter-base voltage VEBO
Collector current IC
Collector power MMST918 0.2
PC 2. 5M in.
dissipation PN918 0.310
Junction temperature Tj °C
Storage temperature Tstg −55 to +150 °C
Electrical characteristics (Ta = 25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Collector-base breakdown voltage BVCBO IC=1.0µA Collector-emitter breakdown voltage BVCEO IC=3.0m A
Emitter-base breakdown voltage BVEBO 3.0 IE=10µA 0.01 µA VCB=15V
Collector cutoff current ICBO
1.0 µA VCB=15V , IE=0 , Ta=150°C DC current transfer ratio −h FE IC=3.0m A , VCE=1.0V
Collector-emitter saturation voltage VCE(sat) 0.4 IC/IB=10m A/1m A
Base-emitter saturation voltage VBE(sat) 1.0 IC/IB=10m A/1m A
Transition frequency f T MHz IC=4.0m A , VCE=10V, f=100MHz
1.7 p F VCB=10V , IE=0 , f=140k Hz
Output capacitance Cob
3.0 p F VCB=0 , IE=0 , f=140k Hz Emitter input capacitance Cib 2.0 p F VEB=0.5V , IC=0 , f=140k Hz Noise figure NF 6.0 d B IC=1.0m A , VCE=6.0V ,RG=400Ω , f=60MHz Power gain d B VCB=12V , IC=6.0m A , f=200MHz Gpe Output power Pout m W VCB=15V , IC=8.0m A , f=500MHz Collector efficiency VCB=15V , IC=8.0m A , f=500MHzη
Page Summary Contents For ROHM MMST918 PN918 Data Sheet
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 3 |
| File Size | 58.35 KB |
| Published | July 15, 2026 |
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Frequently Asked Questions
What is the high current gain-bandwidth product ($f_T$) of this transistor?
The transition frequency ($ ext{f}_T$) is 600MHz.
Are these products safe for life-critical equipment like medical instruments?
No. Users must consult a sales representative if the malfunction would directly endanger human life.
What are the absolute maximum ratings for collector power dissipation?
MMST918 has a rating of 0.2 W, and PN918 has a rating of 0.310 W.
How many pieces make up the basic ordering unit?
The standard basic ordering unit is 3000 pieces.