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ROHM UMF28N User Guide

Summary

Enhance your power management systems with the UMF28N, a dual-transistor consolidated package designed for highly efficient power switching circuits. This comprehensive manual provides essential documentation, including detailed electrical characteristics, performance curves, absolute maximum ratings, and physical specifications. It is an indispensable resource for electronics engineers and circuit designers building reliable, compact, and cost-effective electronic equipment requiring robust power control.

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UMF28N

Transistors

Power management (dual transistors) UMF28N 2SA1774 and DTC124XE are housed independently in a UMT package.

Application External dimensions (Unit : mm) Power management circuit

UMF28N

Features 1) Power switching circuit in a single package.

2) Mounting cost and area can be cut in half.

0.1Min.

Structure Silicon epitaxial planar transistor Each lead has same dimensions

ROHM : UMT6

EIAJ : SC-88 Abbreviated symbol : F28

Equivalent circuit

DTr2 Tr1

Packaging specifications Type UMF28N

Package UMT6 Marking F28 Code TR

Basic ordering unit (pieces)

Page Summary Contents For ROHM UMF28N User Guide

Page 1 UMF28N Transistors Power management (dual transistors) UMF28N 2SA1774 and DTC124XE are housed independently in a UMT package. Application External dimensions (Unit : mm) Power management circuit UMF28...
Page 2 UMF28N Transistors Absolute maximum ratings (Ta=25°C) Tr1 Parameter Symbol Limits Unit Collector-base voltage VCBO −60 Collector-emitter voltage VCEO −50 Emitter-base voltage VEBO −6 Collector current...
Page 3 LL IO LT (s at ) ( IN UMF28N h F LL Ic Transistors Electrical characteristics curves Tr1 VCE = −6V Ta = 25°C Ta = 25°C Ta = 100°C -31.5 -20 25°C -500 -10.5 LL IC (m IN h F -100 -0.5 IT IO f T (M z) IB...
Page 4 UMF28N LT (o n) IN LT I( on ) ( Transistors VO=0.3V VCC=5V VO=5V Ta=100°C Ta=−40°C Ta=100°C 2µ Io OUTPUT CURRENT : IO (A) INPUT VOLTAGE : VI(off) (V) OUTPUT CURRENT : IO (A) Fig.1 Input voltage vs. ou...
Page 5 Appendix Notes No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject...

Manual Details

Brand ROHM
Pages 5
File Size 78.22 KB
Published July 07, 2026
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Frequently Asked Questions

Can this transistor be used in life-safety critical equipment?

The manual warns that users seeking extremely high reliability for devices like medical or aerospace machinery must consult a sales representative first.

What is the maximum specified operational temperature range?

For both Tr1 and DTr2, the junction temperature (Tj) and storage temperature (Tstg) limits are 150 °C.

How does using a single-package power switching circuit benefit design?

It allows mounting costs and required area to be potentially cut in half, while also integrating the necessary power switching function.

What types of ordinary electronic devices are these products intended for?

They are designed for typical equipment such as audio visual, office automation, communications devices, and standard electrical appliances.

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