ROHM SSTA28 MMSTA28 Data Handbook/Manual
Summary
Discover detailed specifications for SSTA28 / MMSTA28, a reliable NPN general purpose transistor. This manual provides comprehensive technical documentation, covering absolute maximum ratings, full electrical characteristics, package guidelines (SOT-23), performance curves, and saturation data. Essential reference material for electronics engineers, circuit designers, and developers building high-performance electronic systems and devices.
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SSTA28 / MMSTA28
Transistors
NPN general purpose transistor SSTA28 / MMSTA28 Features
External dimensions (Unit : mm)
1) BVCES < 80V (Ic=100µA)
SSTA28
Package, marking and packaging specifications 0.95 0.95 0.45±0.1
Part No. SSTA28 MMSTA28 (2)(1)
Packaging type SST3 SMT3
0.2Min.
Marking RAT RAT
Code T116 T146
0.15 +0.1 (1) Emitter
Basic ordering unit (pieces) −0.06 +0.1
0.4 (2) Base ROHM : SST3 −0.05
JEDEC : SOT-23 All terminals have same dimensions (3) Collector
MMSTA28 2.9±0.2
1.1 +0.2 1.9±0.2 −0.1 Absolute maximum ratings (Ta=25°C) 0.95 0.95 0.8±0.1
Parameter Symbol Limits Unit (2)(1)
Collector-base voltage VCBO Collector-emitter voltage VCEO
Emitter-base voltage VEBO (3)
Collector current IC 0.3 0.15 +0.1 −0.06 +0.1
ROHM : SMT3 0.4 (1) Emitter Collector power dissipation PC 0.2 −0.05
EIAJ : SC-59 All terminals have same dimensions (2) Base
Junction temperature Tj °C 0. 0.
JEDEC : SOT-346 1. (3) Collector 1.
Storage temperature Tstg −55 to +150 °C
0. 3M in
Electrical characteristics (Ta=25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Collector-base breakdown voltage BVCBO IC = 100µA Collector-emitter breakdown voltage BVCES IC = 100µA Emitter-base breakdown voltage BVEBO IE = 10µA
ICBO 0.1 µA VCB = 60V
Collector cutoff current IBEO 0.1 µA VEB = 10V
ICES 0.5 µA VCE = 10V VCE(sat) 1 0.7 1.2 IC/IB = 10m A/10µA
Collector-emitter saturation voltage
VCE(sat) 2 0.8 1.5 IC/IB = 100m A/0.1m A
Base-emitter saturation voltage VBE(on) 1.4 2.0 VCE/IB = 5V/100m A
VCE = 5V , IC = 10m A
DC current transfer ratio h FE
VCE = 5V , IC = 100m A10000
Transition frequency f T MHz VCE = 5V , IE = 10m A , f = 100MHz Output Capecitance COb 5.0 8.0 p F VCB = 10V , IE = 0 , f = 1MHz
Page Summary Contents For ROHM SSTA28 MMSTA28 Data Handbook/Manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 3 |
| File Size | 54.34 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
What is the Collector-emitter saturation voltage VCE(sat)?
The typical value for VCE(sat) is 0.8V to 1.2V.
How is power dissipation rated for the emitter?
Emitter power dissipation (PC) is limited to 0.2W.
What are the operating temperature ranges for the device?
The suggested operational temperatures include -40°C, 25°C, and up to 125°C.
What type of packaging does SSTA28 use?
SSTA28 uses an SST3 package (SMT3).
Are these transistors suitable for high-reliability or life-safety applications?
No, users should consult a sales representative if the application requires extremely high levels of reliability like medical instruments.