Panasonic UNR4121, 4122, 4123, 4124, 412X, 412Y (UN4121, 4122, 4123, 4124, 412X, 412Y) DATA SHEET
Summary
These miniaturized PNP epitaxial transistors feature built-in resistors, allowing engineers to optimize digital circuitry for cost reduction and component downsizing. The provided manual is a comprehensive technical guide detailing all electrical characteristics, absolute maximum ratings, operational parameters, and switching curves necessary for reliable system integration. It is essential documentation for electronic designers building compact and efficient equipment circuits.
Page 1 Text Content
Transistors with built-in Resistor
UNR4121/4122/4123/4124/412X/412Y (UN4121/4122/4123/4124/412X/412Y) Silicon PNP epitaxial planer transistor
Unit: mm
For digital circuits 4.0±0.2
Features Costs can be reduced through downsizing of the equipment and reduction of the number of parts. New S type package, allowing supply with the radial taping.
marking
Resistance by Part Number
UNR4121 2.2kΩ 2.2kΩ 1.271.27
UNR4122 4.7kΩ 4.7kΩ 2.54±0.15
UNR4123 10kΩ 10kΩ
1 : Emitter
UNR4124 2.2kΩ 10kΩ
2 : Collector
UNR412X 0.27kΩ 5.0kΩ 3 : Base
UNR412Y 3.1kΩ 4.6kΩ New S Type Package
Absolute Maximum Ratings (Ta=25˚C)
Internal Connection
0. Parameter Symbol Ratings Unit 0. 0.
Collector to base voltage VCBO –50 R1
Collector to emitter voltage VCEO –50 Collector current IC –500 m A R2 Total power dissipation PT m W Junction temperature Tj ˚C Storage temperature Tstg –55 to +150 ˚C
Note.) The Part numbers in the Parenthesis show conventional part number.
Page Summary Contents For Panasonic UNR4121, 4122, 4123, 4124, 412X, 412Y (UN4121, 4122, 4123, 4124, 412X, 412Y) DATA SHEET
Manual Details
| Brand | Panasonic |
|---|---|
| Pages | 7 |
| File Size | 120.88 KB |
| Published | June 22, 2026 |
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Frequently Asked Questions
What are the absolute maximum ratings for the transistor?
The Collector to base voltage (Vcb) cannot exceed –50 V. The collector to emitter voltage (Vce) must be between –50 V and –50 V, and the total power dissipation (P) limit is 300 mW.
Are there considerations for product design during equipment creation?
You must comply with guaranteed values, especially maximum ratings, operating power supply voltage ranges, and heat radiation characteristics. Redundant design is recommended to avoid violating laws or regulations.
Is the datasheet information permanent?
No. The content, including available product types and technical data, is subject to change without notice. Always consult the semiconductor sales office for the latest information.